CN1940373B - Drainage manhole for connection of different types and different diameter round pipes - Google Patents

Abstract

Provided is a different type, different diameter connection drainage manhole comprising a drainage manhole body provided with an upward inspection cylinder connecting part and a socket receiving port for connecting a socket to the upstream side and the downstream side; an upstream side socket having a drainage manhole body spigot fitted to the socket receiving port and connected to the drainage manhole body on one end and a circular pipe receiving port to be joined by a rubber ring to the circular pipe on the other end; an upstream side socket having a drainage manhole body spigot fitted to the socket receiving port and connected to the drainage manhole body on one end and a circular pipe socket to be joined by a rubber ring to the circular pipe on the other end; wherein the drainage manhole body is determined by a maximum nominal diameter in the various circular pipes to be connected, and the upstream side socket and the downstream side socket are determined by a combination of the drainage manhole body and a kind and a nominal diameter of circular pipe. So that different type, different diameter circular pipes can be connected by one drainage manhole.

Description

Drainage manhole for connection of different types and different diameter round pipes

technical field

The present invention relates to a drainage manhole for connecting round pipes of different types and different diameters, and particularly relates to the case where the types and/or calibers of the round pipes connected to the upstream side of the drainage manhole and the round pipes connected to the downstream side are different, There is no need for special pipe joints, and a drainage manhole determined by the maximum nominal diameter of the above-mentioned connected various round pipes can be used to connect different kinds of pipes with different diameters. the

Background technique

When constructing drainage piping, drainage manholes are often provided in the middle of the route for inspection of the buried piping or for merging other drainage piping. At this time, most of the drainage manholes under construction are often used to connect new pipes to existing pipes, etc. If the buried pipes are not excavated for inspection, it may not be possible to accurately grasp the buried pipes. The diameter of the installed piping, the type of piping such as horizontal pipe, ribbed pipe, corrugated pipe, etc. In addition, even with pipes of the same type and the same nominal diameter, the actual diameter of the pipe varies among the manufacturers due to the difference in the manufacturing standards of the pipe manufacturers. the

Therefore, in the actual construction site, in order to be able to correspond to the connection with pipes of any type or diameter, it is necessary to prepare in advance a plurality of suitable and special pipes described in JP-A-9-100987 or JP-A-2002-39486. Drainage manholes for connecting pipes, or drainage manholes with sockets of various sizes. the

In addition, when the diameters of the pipes connected to the upstream side and the downstream side of the drain manhole are different, for example, first select the drain manhole with a socket suitable for the pipe with the largest diameter, and other pipes need to be installed in the middle. 63-42233 Gazette or Unexamined Publication No. 1-116294, the different-diameter pipe connection joints with different inlet and outlet diameters are connected by adjusting the diameter of the socket suitable for the drainage manhole in advance. the

In addition, when the types of pipes connected to the upstream side and the downstream side of the drainage manhole are different, it is necessary to install the dissimilar pipe connection joint described in JP 7-52464 in the middle of any one of the pipes. The other piping is the same type of piping. In particular, in the case of horizontal pipes, ribbed pipes, corrugated pipes, etc., even though the nominal diameters of the pipes are usually the same, the actual pipes have different inner diameters or outer diameters. In the case of directly connecting a non-standardized pipe such as a ribbed pipe to a drainage manhole, the pipe connection joint of a large diameter pipe and the connection joint of a heterogeneous pipe must be used in JP-A-9-100987 and JP-A-2002-39486. The special drainage manhole described. Hereinafter, the term "bore diameter" here refers to the diameter of the mouth including the inner diameter and the outer diameter. The following are the same. the

As mentioned above, when installing the drainage manhole, when the front and rear drainage pipes are different types and different diameter round pipes, it is necessary to prepare special parts such as a plurality of different types of pipe connection joints or different diameter pipe connection joints in advance. It takes time to install these parts on the round pipe and to adjust the type and diameter of the pipe. In addition, there is a problem that the special displacement for connecting unstandardized pipes such as ribbed pipes is expensive. the

Patent Document 1: JP-9-100987 Gazette;

Patent Document 2: JP-A-2002-39486 Gazette;

Patent Document 3: Publication No. 63-42233;

Patent Document 4: Shikaiping No. 1-116294 Bulletin;

Patent Document 5: Publication No. 7-52464 of Shihei. the

Contents of the invention

Therefore, the object of the present invention is to provide a drain pipe that can be installed with a single drain pipe without using a different pipe connection joint or a different diameter pipe connection joint even if the front and rear drain pipes are different types and different diameter round pipes. The hole connects the drainage manhole of the circular pipe of different types and different diameters. the

In order to achieve the above object, one of the inventions described in the present invention is a drainage manhole for connection of heterogeneous and different-diameter circular pipes, comprising:

The main body of the drainage manhole, which is provided with an upward inspection cylinder connection part, and a casing socket for connecting the casing on the upstream side and the downstream side;

The casing on the upstream side has a drainage manhole body socket at one end for fitting with the casing socket and connecting with the drainage manhole body, and has a round hole at the other end for engaging with a round pipe with a rubber wheel. Pipe bearing interface;

There is also a casing on the downstream side, which has a drainage manhole body socket at one end for fitting with the casing socket and connecting with the drainage manhole body, and has a rubber wheel engaging with the round pipe at the other end. The circular pipe socket is characterized in that,

The inner diameter of the casing socket on the upstream side of the main body of the drainage manhole and the shape of the socket on the downstream side are determined by the maximum nominal diameter of the various connected round pipes, and the casing on the upstream side The outer diameter of the main body spigot and the shape inner diameter of the round pipe socket, and the outer diameter of the main body spigot of the downstream casing and the shape outer diameter of the round pipe spigot depend on the combination of the type of the drainage manhole body and the round pipe. And the combination of the nominal diameter of the main body of the drainage manhole and the circular pipe is determined. the

As a result, according to the invention described in one of the inventions, since the casing sockets provided on the main body of the drainage manhole are standardized to a given number of sockets with a certain shape, the above sockets are connected to the connected The pipes on the upstream side and the downstream side of the round pipe can be connected to round pipes of different types and different diameters only by selecting them according to the type and diameter of the round pipes, making the piping construction very easy. In addition, in the present invention, since the rubber wheel joint is used for the connection of the drainage manhole and the round pipe, even if there is some deviation in the connection angle of the round pipe due to simple construction, the deviation angle can be easily absorbed. the

Also, according to the present invention, since the selection of the drainage manhole to be constructed is determined by the largest nominal diameter in the various round pipes to be connected, even in the case of connecting round pipes of different types and different diameters, it is possible to drain water with one Compatible with manholes, enabling low-cost piping construction. the

In addition, according to the present invention, since the basic structure of the main body of the drainage manhole is the same as that of a general resin drainage manhole, the existing injection molding machine can be used to manufacture the drainage manhole, and since there is no need for a new one in principle, Therefore, the drainage manhole of the present invention can be produced at low cost. the

In addition, in the invention described in claim 2, the shape of the bushing socket in the invention described in claim 1 is organized based on the nominal diameter of the round pipe when it is a ribbed pipe, wherein the The shape of the casing socket mentioned above refers to: the flow path d _f a, d _f b of the main body of the drainage manhole, the inner diameter of the casing socket d _s a, d _s b, and the step difference height h _s inside the casing socket a, h _s b.

As a result, according to the invention described in claim 2, since the shape of the sleeve socket provided on the main body of the drainage manhole is organized and integrated based on the nominal diameter of the ribbed pipe, it is possible to significantly reduce the number of drainage manholes. In addition, regardless of the type of round pipe or the number of nominal diameters, the number of drainage manhole bodies to be prepared can be greatly reduced during construction. the

In the invention according to the third aspect of the present invention, the flow path of the sleeve socket in the invention according to the second aspect is determined to be equal to the inner diameter of the inner ribbed tube in the group. the

As a result, according to the invention described in the third invention, even when the main body of the drainage manhole is selected based on the largest nominal diameter in the various round pipes to be connected, it can be formed into a smooth shape so as not to hinder the The water flow in the flow path formed by the round pipe, casing and the main body of the drainage manhole. the

In the invention described in the fourth aspect of the present invention, the inner diameter of the bushing socket of the invention described in the second invention is determined by adding a ribbed tube to the group and doubling the thickness of the bushing. The value after the outer diameter of is equal. the

As a result, according to the invention described in claim 4, the shape of the casing socket provided on the drainage manhole body is standardized to a given number of fixed shapes regardless of the type and diameter of the circular pipes to be connected. . In addition, since the inner diameter of a sleeve having a sufficient thickness can be installed at the sleeve socket, the connection with each round tube can be reliably performed, and the round tube connected to the sleeve is protected from being damaged by Damage caused by external stress, etc. the

In the invention described in the fifth aspect of the present invention, in the bushing socket of the invention described in the second invention, a step difference is provided in the circumferential direction inside it, and the step difference is determined so that the ribbed pipe in the group and the The value obtained by dividing the difference between the inner and outer diameters by 2 plus the thickness of the sleeve is equal. the

As a result, according to the invention described in claim 5, the step provided inside the bushing socket functions as a stopper at the time of bushing installation, and at the same time, the flow path of the bushing socket and the round pipe connected through the bushing When the inner diameters of the tubes are approximately the same, there is virtually no step difference between the two on the inner peripheral surface due to the existence of the above-mentioned step difference, and the shape of the sleeve can be simplified to a shape similar to that of a simple short tube. the

In the invention described in claim 6, each shape of the sleeve of the invention described in claim 1 is distinguished by color. the

As a result, according to the invention described in the sixth aspect, the type of casing is determined by the combination of the main body of the drainage manhole determined by the largest nominal diameter in the various round pipes to be connected, and the type and diameter of the round pipes, and is determined by Since the outlet of the drain manhole main body of the sleeve fitted with the sleeve socket on the drain manhole main body is standardized, the number of sleeves to be actually prepared can be reduced during construction. Therefore, if the sleeve pipes that are limited to a certain type are classified into different types by color, even after construction, by confirming the color of the sleeve pipe from the inside of the drainage manhole, the color of the round pipe connected to it can be easily grasped. Type and caliber. the

The invention described in the seventh of the present invention, the sleeve of the invention according to one of the present inventions includes: the sleeve whose circular pipe socket or circular pipe socket is smaller in diameter than the drain manhole main body socket of the sleeve . the

As a result, according to the invention described in the seventh aspect of the present invention, the upstream side bushing constituted by using a short pipe in which the diameter of the main body socket of the bushing is enlarged and the diameter of the circular pipe socket is reduced, and the diameter of the main body socket is enlarged and rounded. Even if the round pipes connected before and after the drainage manhole are round pipes with different calibers, the downstream side casing composed of a short pipe with a reduced diameter at the pipe socket can be used to match the maximum nominal diameter of the above-mentioned various round pipes. Select a drainage manhole to connect different diameters and dissimilar round pipes. the

According to the invention described in the eighth aspect of the present invention, the central axis of the drain manhole main body socket of the upstream side casing of the invention described in the seventh aspect of the present invention is eccentric with respect to the central axis of the round pipe socket of the upstream side casing, Make the height of the inner peripheral surface of the drain manhole body socket at the pipe bottom of the upstream side casing substantially the same as the height of the inner peripheral surface of the circular pipe socket, or the drainage of the downstream side casing The central axis of the hole main body socket is eccentric relative to the central axis of the circular pipe socket of the downstream side casing, so that the height of the inner peripheral surface of the drainage manhole main body socket at the bottom of the downstream side casing and the height of the The heights of the inner peripheral surfaces of the circular pipe sockets are substantially the same. the

As a result, according to the invention described in the eighth aspect of the present invention, even if the circular pipe socket or the circular pipe socket of the casing pipe is reduced in diameter from the socket of the drainage manhole main body of the casing pipe to connect the circular pipe with a different diameter and the drain In the case of manholes, since the central axis of the circular pipe socket of the casing or the socket of the circular pipe and the central axis of the main socket of the drainage manhole of the casing are offset from each other, the inner peripheral surface is substantially consistent at the bottom of the casing , There is no accumulation of sewage inside the casing. the

In addition, according to the invention described in the ninth aspect of the present invention, in the case of a circular pipe, especially a horizontal pipe, a ribbed pipe, a corrugated pipe, or a combination thereof, which is connected to the drainage manhole of the invention described in one of the present inventions, it can Maximize the enjoyment of the above benefits. the

(Invention effect)

According to the present invention, even if the round pipes connected to the drainage manhole are different types and/or round pipes with different calibers, by selecting a drainage manhole consistent with the largest nominal diameter among them, it is possible to connect round pipes of different types and different diameters. . Furthermore, according to the present invention, since the rubber wheel joint is used for connecting the drainage manhole and the round pipe, even if the round pipe connection angle deviates slightly due to simple construction, the deviation angle can be easily absorbed. the

As a result, the number of drain manholes that should be prepared in advance can be significantly reduced even if the type or diameter of the installed piping at the position where the drain manhole is installed is unclear, or the actual diameter of the pipe varies from manufacturer to manufacturer. , As a result, the construction cost of drainage manhole installation construction can be significantly reduced. the

According to the present invention, since the basic structure of the main body of the drainage manhole is substantially the same as that of a general resin drainage manhole, the drainage manhole can be manufactured using a conventional injection molding machine, and a new metal mold is not required in principle. Therefore, the drainage manhole of the present invention can be produced at low cost. the

In addition, according to the present invention, the color of the sleeve installed on the drainage manhole can be differentiated according to the type. The type and diameter of the round pipe connected to it. the

In addition, according to the present invention, even in the case of connecting a round pipe with a different diameter and a drainage manhole using a sleeve whose round pipe socket or round pipe socket is smaller in diameter than the main body socket of the bushing, since the sleeve The central axis of the circular pipe socket or the central axis of the circular pipe socket and the central axis of the main body socket of the drainage manhole of the casing are offset from each other, so that the inner peripheral surface is substantially consistent at the bottom of the casing, so there is no gap inside the casing. Generate sewage accumulation. the

Description of drawings

Fig. 1 is a side view showing the main body of the drainage manhole for connecting round pipes of different types and different diameters according to the present invention. the

Fig. 2 shows a combination example of a round pipe connected to the upstream side of the drainage manhole and a sleeve selected according to the type and/or diameter of the drainage manhole body and the round pipe according to the present invention. the

Fig. 3 shows a combination example of a round pipe connected to the downstream side of the drainage manhole and a sleeve selected according to the type and/or diameter of the drainage manhole body and the round pipe according to the present invention. the

4 is a side view showing a case where a corrugated pipe and a horizontal pipe having an inner diameter smaller than the flow path of the sleeve socket of the drain manhole are connected to the upstream side and the downstream side of the drain manhole according to the present invention. the

5 is a sectional view showing a state in which the drainage manhole and the connected circular pipe of the present invention are cut on a plane including the central axis of the drainage manhole and the connected circular pipe in FIG. 4 . the

Fig. 6 shows that a corrugated pipe with an inner diameter smaller than the flow path of the casing socket of the drainage manhole is connected to the upstream side of the drainage manhole of the present invention, and a bellows with a flow path approximately equal to the casing socket is connected to the downstream side. Side view of the case of ribbed tubes of the same size inside diameter. the

7 is a cross-sectional view showing a state in which the drainage manhole and the connected circular pipes of the present invention are cut on a plane including the central axes of the drainage manhole and the connected circular pipes in FIG. 6 . the

Fig. 8 is a side view showing the main body of the drainage manhole for connecting four confluent type circular pipes of different types and different diameters according to the present invention. the

Fig. 9 is an end view showing a state in which the drainage manhole of the present invention shown in Fig. 8 is cut along the AA section. the

In the figure: 1, 1'—drainage manhole for connection of heterogeneous and different diameter circular pipes; 2,200—drainage manhole main body; 3,3'—corrugated pipe; 4,4'—ribbed pipe; 5,5' —horizontal pipe; 6, 6'—reduced-diameter upstream side casing (for bellows connection); 7,7'—short tube type upstream side casing (for ribbed pipe connection); 8,8'— Reduced diameter upstream side casing (for horizontal pipe connection); 9, 9' - reduced diameter downstream side casing (for bellows connection); 10, 10' - short tube type downstream side casing (with rib pipe connection); 11, 11'—downstream casing of reduced diameter type (for horizontal pipe connection). the

Detailed ways

Hereinafter, a drainage manhole for connecting circular pipes of different types and different diameters according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the Example shown below, Various changes are possible in the range which does not deviate from the technical idea of this invention. the

Fig. 1 is a side view showing the main body 2 of the drainage manhole for connecting round pipes of different types and different diameters according to the present invention. The drainage manhole of the present invention is generally made of resin such as vinyl chloride, polypropylene, and polyethylene, and is composed of a main body and a socket. In addition, the main body 2 includes an inspection cylinder connection portion 20 provided upward, a sleeve socket 21a provided on the upstream side, and a sleeve socket 21b provided on the downstream side. the

Also, on the inspection cylinder connection portion 20 shown in FIG. 1, a groove portion 24 and a ripple (ripple) 25 for rubber wheel engagement are provided, but the connection mode of the inspection cylinder connection portion is not limited to this mode, Therefore, the shape of the tube connecting portion 20 is inspected. Although not shown in the figure, it may be a shape corresponding to a general connection method by adhesive or welding without providing grooves and sand grains. the

As shown in Fig. 1, the structure of the main body 2 has the same structure as that of a common drainage manhole except that the axial length of the sleeve sockets 21a and 21b is shorter than that of the usual round pipe sockets and sockets and has a prescribed shape. The basic structure is roughly the same structure. Therefore, the drainage manhole main body 2 of the present invention can be produced using a conventional injection molding machine, and since there is no need to make a new mold in principle, the drainage manhole of the present invention can be produced at low cost. the

Sleeve sockets 21a, 21b are provided on the upstream side and the downstream side of the drain manhole main body. The shapes of the sleeve sockets 21a, 21b are organized based on the nominal diameter of the ribbed pipe. the

The contents shown in Table 1 represent the situation of drainage pipes in Shanghai, China, and each of the corrugated pipes, ribbed pipes, and horizontal pipes shows the different inner diameters and outer diameters for each round pipe of each nominal diameter (DN). As can be seen from Table 1, for example, in the case of nominal diameter: DN400, even if the nominal diameter is the same, there are round pipes with different inner diameters and outer diameters for bellows pipes, ribbed pipes, and horizontal pipes. the

Table 1: Inner diameter and outer diameter of each round tube for each nominal diameter

In the case of preparing a drainage manhole having a casing socket corresponding to each of the inner diameter and outer diameter of each round pipe of each nominal diameter shown in Table 1, it is necessary to make and prepare a plurality of different drainage manholes. Manholes are not economical. Here, in the present invention, in order to become a ribbed pipe having the largest inner diameter: di and outer diameter: do among the nominal diameters, in other words, based on the nominal diameter of the ribbed pipe, the The inner and outer diameters of the individual round tubes shown are grouped with respect to the individual nominal diameters. The results are shown in Table 2. the

Table 2: The maximum inner diameter and maximum outer diameter of each round pipe based on the nominal diameter of the ribbed pipe

Next, a method of determining the thickness of the sleeve: t described later, which affects the determination of the shape and dimensions of the sleeve sockets 21a, 21b provided in the drain manhole 2, will be described. the

Table 3 shows the value obtained by dividing the difference between the inner and outer diameters (do-di) of each round pipe obtained in Table 2 by 2, that is, the outer thickness of each round pipe grouped on the basis of the nominal diameter of the ribbed pipe. With the thickness of the casing used in the present invention: t. Since the sleeve has a cylindrical shape basically composed of the same structure as the cylinder, the thickness of the sleeve: t is determined later with reference to the outer thickness of the circular tube with respect to each nominal diameter. However, in the case of corrugated tubes and ribbed tubes, the thickness of the outer surface after providing reinforcing materials such as ribs (ribs), so the thickness of a sleeve without such reinforcing materials: t, is also the same as without reinforcing materials The outer thickness of the horizontal pipe is determined as a benchmark. the

Table 3: The outer thickness of each round tube and the thickness of the casing based on the nominal diameter of the ribbed tube

Next, the determination method of the main shape dimension of the sleeve socket 21a, 21b provided in the drainage manhole main body 2 of this invention is demonstrated. the

In Table 4, the inner diameter: di and the outer diameter: do of each round pipe grouped based on the nominal diameter of the ribbed pipe shown in Table 2 are shown, and the maximum inner diameter: d is obtained. ₁ and outer diameter: content of the value of d ₂ . Due to the grouping from Table 1 to Table 2, the maximum inner diameter and outer diameter for each nominal diameter are summarized as the value of the ribbed pipe, so the largest inner diameter: d ₁ and outer diameter: d ₂ for each nominal diameter The values are for ribbed tubes.

Table 4: Maximum inner diameter of each round tube based on the nominal diameter of the ribbed tube: d ₁ and maximum outer diameter: d ₂

Nominal diameter (DN) Maximum inner diameter in each round tube: d ₁ (mm) = inner diameter of ribbed tube Maximum outer diameter in each round tube: d ₂ (mm) = outer diameter of ribbed tube Below 150 150 170 Below 225 225 250 Below 300 300 335 Below 400 400 450 Below 500 492 550

The flow paths at the inner positions of the sleeve sockets 21a and 21b on the upstream side and the downstream side: d _f a, d _f b (refer to FIG. 1 ), must be connected so as to be combined on the basis of the nominal diameter of the ribbed pipe. Therefore, the flow path: _df a, _dfb is determined to be equal to the inner diameter _d1 having the maximum value among the circular pipes in the group. Therefore, in the case of the present invention, since the grouping is summarized as the value of the ribbed pipe with respect to the maximum inner diameter of each nominal diameter, the flow paths of the sleeve sockets 21a, 21b: d _f a, d _f b (refer to Figure 1), equal to the internal diameter of the ribbed tube with respect to its nominal diameter.

In addition, since all the circular pipes in the group organized based on the nominal diameter of the ribbed pipes must be connected via bushings, The inner diameters of the bushing sockets 21a, 21b: d _s a, d _s b (see Fig. 1) are determined by multiplying the thickness of the bushings shown in Table 3: t by a factor of 2 and the circle in the group The outer diameter in the tube that has the largest value: d ₂ are added to give equal values. Thus, in the case of the present invention, since the grouping is summarized as the value of the ribbed pipe with regard to the maximum outer diameter of each nominal diameter, the inner diameters of the sleeve sockets 21a, 21b: d _s a, d _s b, and The values obtained by doubling the thickness of the casing and adding the outer diameter of the ribbed tube with respect to its nominal diameter are equal.

In addition, steps 23a, 23b are provided inside the casing sockets 21a, 21b on the upstream side and downstream side, which are used to substantially eliminate the gap between the flow path 22 of the drainage manhole main body 2 and the drainage manhole through the casing. The difference between the cylinders connected by the main body socket or sleeve, and the inner peripheral surface. the

Since it is necessary to consider the value of the thickness of the casing grouped on the basis of the nominal diameter of the ribbed pipe and the difference between the inner and outer diameters (do-di) of the round pipes in the group connected through the casing divided by 2, that is, the appearance Thickness (refer to Table 3), and absorb the step difference, so the height of the step difference 23a, 23b: h _s a, h _s b, is determined to be related to the outer thickness of the inner circular tube and the thickness of the casing in the group: The value when the sum of t is maximum is equal. Thereby, under the situation of the present invention, the maximum inner and outer diameter difference about each nominal diameter that is grouped is the value of the ribbed pipe, so the height of the step difference 23a, 23b: h _s a, h _s b, and the sleeve pipe Thickness: the value obtained by adding t and the difference between the inner and outer diameters of the ribbed tube divided by 2, or the value obtained by subtracting the flow path from the inner diameter of the sleeve socket 21a, 21b determined based on the result The values (d _s a—d _f a) and (d _s b—d _f b) divided by 2 are equal.

As mentioned above, if the main shape and dimension of the sleeve sockets 21a, 21b (the flow path of the drainage manhole body 2) on the drainage manhole body 2 of the present invention are determined based on the nominal diameter of the ribbed pipe : d _f a, d _f b, the inner diameter of the casing socket: d _s a, d _s b, the step height inside the casing socket: h _s a, h _s b) To summarize, it is as follows as in Table 5.

Table 5: The main shape and dimensions of the casing socket based on the nominal diameter of the ribbed pipe

Nominal diameter (DN) Flow path of drain manhole body: d _f (mm) = Maximum inner diameter in each round pipe: d ₁ Inner diameter of casing socket: d _s (mm) = maximum outer diameter of each round tube: d ₂ + casing thickness: t×2 Step difference inside the casing socket: h _s (mm) = (d _s —d _f )/2+ casing thickness: t Below 150 150 178 14 Below 225 225 262 18.5 Below 300 300 351 25.5 Below 400 400 474 37 Below 500 492 580 44

The upstream side and downstream side bushing sockets 21a, 21b may have the same size flow paths: d _f a, d _f b, or may have different flow paths. In the latter case, generally, a device in which the diameter of the flow path: d _f b of the casing socket port 21 b on the downstream side is enlarged relative to the flow path: d _f a of the casing socket port 21 a on the upstream side is used. In addition, inside the sleeve sockets 21a, 21b, steps 23a, 23b are provided over the entire circumference so that the flow path 22 is vertically narrowed from the outside to the inside, and the heights of the steps 23a, 23b: h _s a, h _s b, as described above, is set to a value obtained by adding the thickness of the sleeve: t and the value obtained by dividing the difference in inner diameter of the ribbed tube by 2.

Therefore, the steps 23a, 23b function as stoppers when the bushing is installed, and at the same time, the flow paths through the bushing sockets 21a, 21b on the upstream side: d _f a, d _f b and the In the case where the inner diameters of the cylinders to which the sleeve is connected are substantially the same, due to the existence of the above-mentioned steps 23a, 23b, there is substantially no step difference in the inner peripheral surface between the two, and as a result, the sleeve can be The shape of is simplified to a shape similar to the simple short tube shown in Fig. 2b, Fig. 3b.

Fig. 2 shows the round pipe connected to the upstream side of the drainage manhole of the present invention, and the sleeve pipe installed on the drainage manhole main body 2 determined by the combination of the type and nominal diameter of the drainage manhole main body and the round pipe. Combination example. the

Figure 2a shows the combination of the corrugated pipe 3 and its corresponding upstream casing 6, Figure 2b shows the combination of the ribbed pipe 4 and its corresponding upstream casing 7, and Figure 2c shows the horizontal pipe 5 and its corresponding upstream casing Tube 8 combinations. In addition, Fig. 2a, 2c show the combination of the inner diameter of the round pipe than the flow path of the casing socket 21a of the drainage manhole main body 2: d _f a, and Fig. 2b shows the combination of the inner diameter of the round pipe and the drainage manhole main body 2 The flow path of the bushing socket 21a: a combination when d _f a is substantially the same. In addition, each round pipe shown in FIGS. 2a to 2c has the same structure as each round pipe connected to the downstream side shown in FIGS. 3a to 3c described later.

The round pipes 3, 4, 5 are made of straight pipe portions 30, 40, 50 with approximately the same diameter, and in the straight pipe portion, there are: those corresponding to the rubber wheel engagement mode that are larger in diameter than the straight pipe portions 30, 40, 50. Sockets 31 , 41 , 51 ; and sockets 32 , 42 , 52 with the same caliber as the straight pipe portions 30 , 40 , 50 that are engaged with the same corresponding rubber wheels. In addition, in the case of the corrugated tube 3 and the ribbed tube 4 , in order to increase the breaking strength of the round tube, the annular peaks 33 and 43 are arranged at regular intervals along the longitudinal direction over the entire outer peripheral surface. the

Inside the sockets 31, 41, 51 of the round pipes 3, 4, 5, steps 34, 44, 54 corresponding to the surface thickness of the round pipes are provided throughout the entire circumference. The above-mentioned downstream side casing and other round pipes are connected to the stopper to function and facilitate the connection work, and at the same time, it can substantially release the inner peripheral surface between the casing connected to the round pipe and other round pipes. The function of the step difference generated above. In addition, in the case of the horizontal pipe 5, a groove portion 56 is provided over the entire circumference inside the socket 51, and a rubber wheel 55 for sealing the joint is fixed therein (see FIG. 2c). the

Rubber wheels 35, 45 for sealing joints are fixed to the outer peripheries of the sockets 32, 42 of the corrugated tube 3 and the ribbed tube 4 by using gaps between the peaks 33, 43 (see FIGS. 2a, 2b). In addition, the rubber wheels 35, 45 can also be fixed by providing grooves or the like inside the sockets 31, 41 of the bellows 3 and the ribbed pipe 4 similarly to the socket 51 of the horizontal pipe 5 shown in Fig. 2c. , but according to the fixing method shown in the figure, the rubber wheels 35, 45 can be embedded on the mountain portions 33, 43 without using a special fixing mechanism by effectively utilizing the mountain portions 33, 43. the

In addition, in the case of the horizontal pipe 5, a pair of collars (collars) (not shown) are fitted outside the outer peripheral portion of the socket 52, and a rubber wheel for sealing the joint can also be fixed therebetween, but here In this case, there is no need to set the groove portion 56 for fixing the rubber wheel inside the socket 51 of the horizontal pipe 5, and the socket 31 of the bellows 3 and the ribbed pipe 4 shown in Fig. 2a and Fig. 2b can be used. , 41 have the same structure. the

Next, the upstream side bushings 6, 7, 8 used to connect the round pipes 3, 4, 5 to the drainage manhole of the present invention will be described. the

The upstream casings 6, 8 shown in Fig. 2a and Fig. 2c are for connecting circular pipes 3, 5 having a smaller inner diameter than the flow path of the casing socket 21a of the drainage manhole main body 2: d _f a. The reduced-diameter upstream-side bushings 6 and 8 used for drain manhole connection are mainly composed of reduced-diameter parts 61 and 81 and straight pipe parts 62 and 82 .

The reduced-diameter parts 61, 81 are formed by the ring parts 66, 86 embedded in the inner peripheral surface of the casing socket 21a of the drainage manhole main body 2, and are opposite to the step 23a inside the casing socket 21a. The wall parts 67, 87 of the same height, and the eccentric ring parts 68, 88 which continuously deform a part of the inner peripheral surface of the sleeve to form a ring shape are formed, and are internally engaged with the sleeve socket 21a of the drainage manhole main body 2. The main body socket 63,83. the

In addition, because the central axis of the main body socket 63, 83 is eccentric to the central axis of the circular pipe socket 64, 84 of the straight pipe part 62, 82 described later, so that the bottom and inner peripheral surface of the casing The substance is consistent, so no sewage accumulation is generated inside the casing. the

Straight pipe portions 62, 82 are composed of short pipes with substantially the same diameter including round pipe sockets 64, 84 that are circumscribed with sockets 32, 52 of round pipes 3, 5 and engaged by rubber wheels. On the inner peripheral surface of the boundary portion between the reduced diameter portions 61, 81, steps 69, 89 having a height substantially equal to the outer peripheral thickness of the round tubes 3, 5 are formed over the entire circumference, and are connected to the reduced diameter portion. 61, 81 are integrally formed. the

The steps 69, 89 function as stoppers when the sockets 32, 52 of the round pipes 3, 5 are inserted into the round pipe sockets 64, 84 of the drainage manhole and the rubber wheels are engaged, and the connection operation becomes easier. It is easy, and at the same time, it has the function of substantially eliminating the step difference generated on the inner peripheral surface between the connected round pipes 3, 5 and the sleeves 6, 8 (see FIG. 5 ). the

In addition, in the case of a bushing corresponding to the horizontal pipe 5, a groove portion 56' is provided over the entire circumference inside the socket 84, and a rubber wheel 55' for sealing the joint is fixed therein (see FIG. 2c). However, as described above, in the case of adopting a connection method in which the rubber wheel is fixed to the outer peripheral portion of the socket 52 of the horizontal pipe 5, it is not necessary to provide such a groove portion 56' and the rubber wheel 55 inside the bushing socket 84. ', but the same structure as other casing sockets. the

In addition, in the present invention, the straight pipe portions 62, 82 are not necessary parts in the diameter-reducing sleeve pipes 6, 8. The central axes of the sleeves are eccentric to each other, so that the inner peripheral surface of the tube bottom of the sleeve is substantially consistent, and the overall sleeve can also be a shape in which the diameter of the sleeve is continuously reduced from the main body socket 63, 83 to the round pipe socket 64, 84 (Fig. not shown). the

As a result of the above, the drainage manhole of the present invention can also correspond to various round pipes such as the bellows 3 or the horizontal pipe 5 whose inner diameter is relatively small to the flow path of the socket 21a of the drainage manhole: _df a. This inner diameter change also does not create sewage pools and ensures smooth water flow. In this embodiment, although the description of the reduced-diameter upstream casing corresponding to the ribbed pipe 7 is omitted, the basic idea is the same as that of the reduced-diameter upstream casing corresponding to the bellows 3. 6 is roughly the same (see Figure 2a).

The upstream sleeve 7 shown in FIG. 2b is used to connect a circular pipe 4 having an inner diameter approximately the same as the flow path d _f a of the sleeve socket 21a of the drain manhole main body 2 to the drain manhole. short tube casing. In this embodiment, since the nominal diameter of the ribbed pipe 4 is used as the benchmark, a short tube-type sleeve is used for the connection of the ribbed pipe 4, but when the nominal diameter of the corrugated pipe 3 or the horizontal pipe 5 is used as the benchmark In some cases, a short tube type bushing is used for the connection of the bellows 3 or the horizontal pipe 5 .

The upstream casing 7 includes a main body socket 73 that is internally connected to the casing socket 21a of the drain manhole body 2 and is engaged, and a round pipe socket 74 that is externally connected to the socket 42 of the ribbed pipe 4 and is rubber-bonded. The short pipe 72 having substantially the same caliber, but when, for example, based on the nominal diameter of the horizontal pipe 5, the round pipe connected to the upstream casing 7 becomes the horizontal pipe 5 as shown in FIG. 2c , a groove portion is provided over the entire circumference inside the circular pipe socket 74, and a rubber wheel for sealing the joint portion is fixed therein (see FIG. 2c). the

Steps 23a are provided throughout the entire circumference of the casing socket 21a of the drainage manhole main body 2, and the height of the steps 23a: h _s a is set to match the thickness of the casing 7 and the appearance of the circular pipe connected thereto. Thickness: the height at which the added values of h (see FIG. 2b ) are substantially the same.

Therefore, the step 23a functions as a stopper when the sleeve 7 and the ribbed pipe 4 are installed, and at the same time, due to the existence of the above-mentioned step 23a, it can substantially release the tension between the sleeve socket 21a and the ribbed pipe 4. Function of the step difference generated on the inner peripheral surface. the

In other words, the front end of the main body socket 72 of the sleeve 7 and the front end of the socket 42 of the ribbed pipe 4 are connected by abutting against the step 23a provided inside the socket socket 21a of the drain manhole main body 2 . Positioning is performed so that the respective front ends are aligned and the step difference generated between the sleeve socket 21a and the ribbed tube 4 can be substantially eliminated. Therefore, in the case of the straight pipe type sleeve pipe 7, there is no need to provide steps 69, 89 respectively, so that it can be simplified to a shape similar to the simple short pipe shown in FIG. This is to eliminate the step difference generated on the inner peripheral surface between the circular pipes 3, 4, 5 connected like the reduced-diameter sleeve pipes 6, 7. the

In addition, in the case of the straight-pipe type sleeve 7, it is also possible to provide a means for canceling the step difference generated on the inner peripheral surface between the cylinders 4 connected like the reduced-diameter type sleeves 6 and 8. However, in this case, since the front end of the socket of the round pipe does not contact the step 23a provided inside the sleeve socket 21a of the drain manhole main body 2, the height of the step 23a: h _s a Above the thickness of the bushing to be installed is sufficient.

Fig. 3 shows a combination example of a round pipe connected to the downstream side of the drainage manhole and a sleeve pipe installed in the drainage manhole determined by the combination of the type and nominal diameter of the drainage manhole body according to the present invention. the

Figure 3a shows the combination of the corrugated pipe 3 and its corresponding downstream casing 9, Figure 3b shows the combination of the ribbed pipe 4 and its corresponding downstream casing 10, and Figure 3c shows the horizontal pipe 5 and its corresponding downstream casing Combination of tube 11. In addition, Fig. 3a, 3c show the combination of the inner diameter of the circular pipe than the flow path of the sleeve socket 21a of the drainage manhole main body 2: _dfb , and the combination of the inner diameter of the round pipe and the drainage manhole main body 2 is shown in Fig. 3b. The flow path of the bushing socket 21a: a combination when d _f b is substantially the same. Also, each of the round pipes shown in Figures 3a to 3c has the same structure as each of the round pipes connected to the upstream side shown in Figures 2a to 2c described above, and when in use, only the drainage system of the present invention The port on the hole connection side is changed from the socket 32, 42, 52 to the socket port 31, 41, 42, which is different from the round pipe connected to the upstream side.

Next, the downstream side bushings 9, 10, 11 used to connect the round pipes 3, 4, 5 to the drainage manhole of the present invention will be described in detail. the

The downstream casings 9, 11 shown in Fig. 3a and Fig. 3c are for connecting the circular pipes 3, 5 having a smaller inner diameter than the flow path of the casing socket 21b of the drainage manhole main body 2: d _f b. The reduced-diameter downstream-side bushings 9, 11 used for the connection of drainage manholes are mainly composed of reduced-diameter parts 91, 111 and straight pipe parts 92, 112, and have the same diameter-reduced type as shown in Fig. 2a and Fig. 2c. The upstream casings 6 and 8 have substantially the same structure.

The reduced diameter portions 91, 111 are formed by rings 96, 116 embedded in the inner peripheral surface of the casing socket 21b of the drainage manhole main body 2, facing the step difference 23b inside the casing socket 21b, and continuously having approximately The wall parts 97, 117 of the same height, and the eccentric ring parts 98, 118 that continuously deform a part of the inner peripheral surface of the sleeve and form a ring shape, including the sleeve socket port 21b of the drainage manhole main body 2. Engaged body sockets 93,113. the

In addition, since the central axis of the main body socket 93, 113 is eccentric to the central axis of the circular pipe socket 94, 114 of the straight pipe part 92, 112, it is substantially consistent with the inner peripheral surface in the bottom of the sleeve. Therefore no accumulation of sewage occurs inside the casing. the

Straight pipe parts 92, 112 are composed of short pipes with approximately the same caliber including round pipe sockets 94, 114 inscribed with sockets 31, 51 of round pipes 3, 5 and engaged by rubber wheels. 91, 111 are integrally formed together. However, due to the step difference generated on the inner peripheral surface between the connected round pipe in the downstream casing, the step difference 34, 54 provided inside the socket port 31, 51 of the round pipe 3, 5 can pass through the step difference. Therefore, there is no need to provide inside the steps 69, 89 like the above-mentioned upstream side bushings 6, 8. the

In addition, in the case of the downstream-side casing corresponding to the bellows 3 and the ribbed pipe 4, even in the case of the reduced-diameter casing 9 or the short-tube type casing 10 described later, the straight pipe Rubber wheels 35', 45' for sealing joints are fixed to the outer peripheral portion of the part 92 or the short tube 102 by using the gaps between the mountain parts 33', 43' (see FIGS. 3a, 3b). Thus, in the case of the downstream side bushings 9, 10 corresponding to the bellows 3 and the ribbed pipe 4, by effectively utilizing the mountain portions 33', 43' provided on the outside, it is possible to attach them without using a special fixing mechanism. Rubber wheels 35', 45' fit easily thereon. the

In addition, in the case of the downstream side bushing 11 corresponding to the horizontal pipe 5 described later, since the rubber wheel 55 is fixed inside the socket 51 of the horizontal pipe 5 connected thereto, it is not necessary to install the straight pipe portion 112. The outer peripheral portion of the fixed rubber wheel (see Figure 3c). the

In addition, in the present invention, the straight pipe parts 92, 112 are not necessary parts in the sleeve pipes 9, 11 used for diameter reduction. The central axes are eccentric to each other, so that the inner peripheral surface at the bottom of the sleeve is substantially consistent, and then the overall sleeve can also be a shape in which the diameter of the sleeve is continuously reduced from the main body socket 93, 113 to the circular pipe socket 94, 114 (in the figure not shown). the

As a result of the above, the drain manhole of the present invention can also correspond to various round pipes such as the bellows 3 or the horizontal pipe 5 whose inner diameter is relatively small to the flow path of the socket 21b of the drain manhole: _dfb , etc. The change of the inner diameter does not produce sewage accumulation and ensures smooth water flow. In this embodiment, although the description of the reduced-diameter downstream bushing corresponding to the ribbed pipe 7 is omitted, the basic idea is the same as that of the reduced-diameter downstream bushing corresponding to the bellows 3. 9 is substantially the same (see Figure 3a).

The downstream side bushing 10 shown in FIG. 3b is a short tube type bushing 10 used to connect the round pipe 4 having approximately the same diameter as the bushing socket 21b of the drain manhole main body 2 to the drain manhole. . In this embodiment, since the nominal diameter of the ribbed pipe 4 is used as the benchmark, a short tube-type sleeve is used for the connection of the ribbed pipe 4, but when the nominal diameter of the corrugated pipe 3 or the horizontal pipe 5 is used as the benchmark In some cases, a short tube type bushing is used for the connection of the bellows 3 or the horizontal pipe 5 .

The downstream casing 10 includes a main body socket 103 that is internally connected to the casing socket 21b of the drainage manhole body 2 and is engaged with it, and a round pipe socket that is internally connected to the socket 41 of the ribbed pipe 4 and is engaged with rubber. 104, which has approximately the same caliber, and includes a ring on the outer periphery of the main body socket 103 for releasing the step difference between the steps 23b provided inside the sleeve socket 21b of the drainage manhole 2. Section 106. the

Steps 23b are provided throughout the entire circumference of the casing socket 21b of the drainage manhole main body 2, and the height of the steps 23b: _hsb is set to correspond to the thickness of the casing 10 and the circular pipe connected thereto. Appearance thickness: a value obtained by adding h (see FIG. 2b ), that is, a height substantially equal to the thickness of the ring portion 106 .

Therefore, the step 23b functions as a stopper when the sleeve 10 is installed, and at the same time, due to the existence of the above-mentioned step 23b, it is played so that substantially no damage occurs on the inner peripheral surface between the sleeve socket 21b and the sleeve 10 . The function of step difference. However, the step 23b does not function as a stopper and a step release mechanism when the connected ribbed pipe 4 is installed, and the front end of the socket 41 of the ribbed pipe 4 rests on the ring on the sleeve 10 The position where the portion 106 abuts (refer to FIGS. 6 and 7 ). the

As a result, even when connecting the round pipes 3, 4, 5 having approximately the same inner diameter as the casing socket 21b flow path: d _f b of the drainage manhole main body 2, to the downstream side casing 10 In this case, similar to the upstream side 7, it may be simplified to a shape similar to a simple short pipe (see FIG. 3b).

In addition, the above-mentioned reduced-diameter type upstream and downstream side casings 6, 8, 9, 11 and short-tube type upstream and downstream side casings 7, 10 can be distinguished by color for each shape. After construction, by checking the color of the casing from the inside of the drainage manhole, the type and diameter of the round pipe connected to it can be easily ascertained. the

(Example 1)

Embodiment 1 is to connect the upstream side and the downstream side of the drainage manhole 1 of the present invention, which have smaller inner diameters than the flow paths d _f a and d _f b of the casing sockets 21 a and 21 b of the drainage manhole 1 . Example of the case of the bellows 3' and the horizontal pipe 5'. Fig. 4 shows a side view of Embodiment 1, and Fig. 5 shows that the drainage manhole 1 and the cylinder 3 of the present invention shown in Fig. 4 are cut on a plane including the central axes of the drainage manhole 1 and cylinders 3', 5'',5' state cross-sectional view.

The drainage manhole 1 of the present invention is composed of a drainage manhole main body 2 provided with casing sockets 21a, 21b, and upstream side and downstream side casings fitted with the casing sockets. The drainage manhole main body 2 is connected by The maximum nominal diameter of the various round pipes is determined, and the upstream side casing and the downstream side casing are determined by the combination of the type and nominal diameter of the drainage manhole main body 2 and the cylinder. The casing sockets 21a, 21b It has the shape and dimensions shown in Figure 5. the

According to Table 1, the number of each round pipe in the range of nominal diameter: DN110 to 500 is all 20 types. As a result, it can be understood that at least 20 types of drainage manholes must be prepared as the corresponding drainage manholes. the

However, according to the present invention, as shown in Table 5, the drainage manhole 1 including the drainage manhole main body 2 and the sleeve sockets 21a, 21b provided on the main body 2, etc., is organized on the basis of five nominal diameters. , and because the shape of the casing sockets 21a, 21b is designed and manufactured to be consistent with the round pipe with the largest inner diameter and outer diameter among the round pipes existing in each group, the main body 2 of the drainage manhole that should be prepared, It is also possible to select only the drainage manhole 1 of a group including the round pipe whose nominal diameter is the largest, using the nominal diameters of the connected round pipes as clues. the

Embodiment 1 shown in Fig. 4 and Fig. 5 is the case where the nominal diameters of the corrugated pipe 3' connected on the upstream side and the horizontal pipe 5' connected on the downstream side are both DN200, and the actual outer diameter of the circular pipe is DN200. 200mm. Therefore, for the drainage manhole 1 prepared with respect to these round pipes 3', 5', the inner diameter of the sleeve socket 21a, 21b including the sleeve thickness: t is selected to be 262mm based on the above-mentioned nominal diameter. Nominal diameter: Drainage manhole 1 of DN225 (refer to Table 1, 5). the

In addition, the inner diameters of the casing sockets 21a and 21b of the drain manhole 1 with a nominal diameter of DN225: d _s a and d _s b are designed and manufactured to have the largest outer diameter among circular pipes with a nominal diameter of DN225 or less : Nominal diameter of do: DN225 ribbed pipe 4' consistent. Therefore, in order to connect the bellows 3' and the horizontal pipe 5' with a nominal diameter smaller than DN225 to the drainage manhole main body 2, as shown in Figure 4 and Figure 5, the nominal diameter: DN225 drainage manhole main body 2 and the nominal Diameter: Corrugated pipe 3' of DN200 and horizontal pipe 5' correspond to reduced-diameter upstream casing 6' and downstream casing 11'.

The casing pipe 6' on the upstream side and the casing pipe 11' on the downstream side are configured so that the main body of the drainage manhole 2 is substantially consistent with the pipe bottoms of the casing pipes 6' and 11', and they are fixed on the casing socket by bonding or welding. On the mouth 21a, 21b. In addition, in order to facilitate the positioning of the top and bottom directions of the reduced-diameter upstream side and downstream side sleeves 6' and 11' without making mistakes, it is also possible to pass through the outer circumference of the main body socket 63', 113' A convex portion is provided on any one of the surface and the inner peripheral surface of the sleeve socket 21a, 21b, and a concave portion or a groove (not shown) suitable for the convex portion is provided on the other side. the

The socket 32' of the corrugated pipe 3' on the upstream side is inserted in such a way that it is inscribed with the round pipe socket 64' of the upstream sleeve 6' installed on the drainage manhole 1, and the socket 51 of the horizontal pipe 5' on the downstream side ' are inserted so as to circumscribe the cylindrical socket 114' of the downstream casing 11', and are respectively engaged by rubber wheels. In addition, in the drainage manhole 1 of the present invention, since the rubber wheel joint method is adopted for the connection between the drainage manhole 1 and the round pipes 3', 5', even if there is some deviation in the connection angle of the round pipes, it can be easily construction to connect. the

In addition, by distinguishing the above-mentioned reduced-diameter type upstream-side casing 6' and downstream-side casing 11' in different colors, it is possible to confirm the color of the above-mentioned casing from the inside of the drainage manhole even after construction. Easily grasp the type or diameter of the round pipe connected to it. the

(Example 2)

In Example 2, a bellows 3' having a smaller inner diameter than the flow path of the sleeve socket 21a of the drain manhole 1: d _f a is connected to the upstream side of the drain manhole 1 of the present invention, and the bellows 3' having a flow path with the sleeve The inner diameter of the socket 21b: Example when the ribbed pipe 4' having the substantially same inner diameter as d _f b is connected to the downstream side. Fig. 6 shows a side view of Embodiment 2, and Fig. 7 shows that the drainage manhole 1 and the cylinder 3 of the present invention shown in Fig. 6 are cut on a plane including the central axis of the drainage manhole 1 and the cylinders 3', 4'',4' state cross-sectional view.

The drainage manhole 1 of the present invention is composed of a drainage manhole main body 2 provided with sleeve sockets 21a, 21b, and upstream side and downstream side sleeves fitted with the sleeve sockets. The drainage manhole main body 2 is composed of The maximum nominal diameter of the various round pipes is determined, and the upstream side casing and the downstream side casing are determined by the combination of the type and nominal diameter of the drainage manhole main body 2 and the cylinder. The casing sockets 21a, 21b It has the shape and dimensions shown in Figure 5. the

Embodiment 2 shown in Fig. 6 and Fig. 7 is the case where the nominal diameter of the corrugated pipe 3' connected to the upstream side is DN200 (the actual outer diameter is 183 mm), and the corresponding ribbed pipe connected to the downstream side The nominal diameter of 4' is DN225 (the actual outer diameter is 225mm). Therefore, with respect to the drainage manholes 1 prepared for these round pipes 3', 4', the inner diameters of the sleeve sockets 21a, 21b are selected based on the above-mentioned nominal diameter: d _s a, d _s b including the thickness of the sleeve: t And the nominal diameter is set to 262mm: DN225 drainage manhole 1 (refer to Table 1, 5).

In addition, the inner diameters of the casing sockets 21a and 21b of the drain manhole 1 with a nominal diameter of DN225: d _s a and d _s b are designed and manufactured to have the largest outer diameter among circular pipes with a nominal diameter of DN225 or less : Nominal diameter of do: DN225 ribbed pipe 4' consistent. Therefore, in order to connect the bellows 3' with a nominal diameter smaller than DN225 to the drain manhole main body 2, as shown in Figure 6 and Figure 7, select the drain manhole main body 2 with a nominal diameter of DN225 and the corrugated pipe with a nominal diameter of DN200 The tube 3' corresponds to a reduced-diameter upstream casing 6'. In addition, in order to connect the ribbed pipe 4' whose nominal outer diameter is approximately the same as the inner diameter of the sleeve socket 21b, as shown in Fig. 6 and Fig. Nominal diameter: DN225 ribbed pipe 4' corresponds to short pipe type downstream side casing 10.

The casing pipe 6' on the upstream side and the casing pipe 10' on the downstream side are configured so that the main body of the drainage manhole 2 is substantially consistent with the pipe bottoms of the casing pipes 6' and 10', and they are fixed on the casing socket by bonding or welding. On the mouth 21a, 21b. In addition, in order to facilitate the positioning of the top and bottom directions of the reduced-diameter upstream side casing 6' without making mistakes, it is also possible to pass through the outer peripheral surface of the main body socket 63' and the casing sockets 21a, 21b. A convex portion is provided on either one of the inner peripheral surfaces of the inner peripheral surface, and a concave portion or a groove portion (not shown) suitable for the convex portion is provided on the other side. the

The socket 32' of the corrugated pipe 3' on the upstream side is inserted in such a way that it is inscribed with the round pipe socket 64' of the casing pipe 6' on the upstream side installed on the drainage manhole 1, and the socket of the ribbed pipe 4' on the downstream side 41' is inserted so as to circumscribe the cylindrical socket 114' of the downstream side casing 10', and is respectively engaged by rubber wheels. In addition, in the drainage manhole 1 of the present invention, since the rubber wheel joint method is adopted for the connection between the drainage manhole 1 and the round pipes 3', 4', even if there is some deviation in the connection angle of the round pipes, it can be easily construction to connect. the

In addition, by distinguishing the above-mentioned reduced-diameter type upstream-side casing 6' and downstream-side casing 10' in different colors, it is possible to confirm the color of the above-mentioned casing from the inside of the drainage manhole even after construction. Easily grasp the type and diameter of the round pipe connected to it. the

(Example 3)

Embodiment 3 is a drainage manhole 1' for the connection of four confluent types of dissimilar and different-diameter circular pipes applying the technical idea of the present invention. It is a drainage manhole 1', which includes: an upwardly facing inspection tube connecting portion 220; The drainage manhole 200 is provided with multiple casing sockets 210a-214a on the upstream side and one casing socket 210b on the downstream side; one end has a drainage manhole main body socket that fits with the casing sockets 210a-214a, On the other end there is an upstream side bushing with a round pipe fitting for engaging with a round pipe with a rubber wheel; The casing on the downstream side of the round pipe socket where the rubber wheel is connected, the embodiment 3 is also a drainage manhole 1', the main body of the drainage manhole is determined by the largest nominal diameter of the various round pipes connected above, and The upper casing and the lower casing are determined by the combination of the type and nominal diameter of the main body of the drainage manhole and the round pipe, and the drainage manhole 1' is used for four confluent types of round pipes of different types and different diameters. Connection. the

Fig. 8 shows the plan view of embodiment 3, and Fig. 9 shows to cut the drainage manhole 1 ' of the present invention shown in Fig. 8 with A-A section. the

The drainage manhole 1' of the present invention is generally made of resin such as vinyl chloride or polypropylene, and consists of a main body 200 and a sleeve. In addition, as shown in Embodiments 1 and 2 above, the shapes of the casing sockets 210a to 214a provided on the upstream side and the casing sockets 210b provided on the downstream side are combined based on the nominal diameter of the ribbed pipe. It has substantially the same shape as the bushing sockets 21a and 21b (see Tables 1 and 5). the

Therefore, the structure of the main body 200 is similar to that of the usual four confluence type drains, except that the sleeve sockets 210a to 214a, 210b have a given shape in which the length in the axial direction is shorter than that of the usual circular pipe sockets and spigots. The basic structure of the pores is almost the same. Therefore, the drain manhole main body 200 of the present invention can be manufactured using a conventional injection molding machine, and since there is no need for making a new mold in principle, the drain manhole of the present invention can be manufactured at low cost. the

In addition, the sleeve sockets 210a to 214a, 210b on the upstream side and the downstream side may each have a shape having a flow path of the same size, or may have a shape having a different flow path. In the latter case, generally, a casing socket whose flow path is larger in the downstream casing socket port 210b than in the upstream casing socket ports 210a to 214a is used. In addition, the installation position of the bushing sockets grouped based on the nominal diameter of the ribbed pipe is not particularly limited, and for example, the bushing sockets 210a, 210b may be arranged only on the upstream side of the drainage manhole body. And on the downstream side, four merging type drainage manholes, etc., of the usual round pipe socket directly connected to the round pipe are arranged at the other inlet. the

In the case of the drainage manhole 1' of the 4 confluent type in Embodiment 3, with reference to FIGS. Four confluence-type drainage manholes 1 of the type in which the main pipe with the largest diameter is connected to the round pipe, and the other four upstream side casing sockets 211a to 214a are used to connect to branch pipes with a smaller diameter than the main pipe. '.

In addition, the reduced-diameter and short-tube casings on the upstream side and downstream side used in the four confluent type drainage manholes 1' of Example 3 correspond to all the above-mentioned casing sockets that are grouped. It has substantially the same shape as the above-mentioned reduced-diameter type upstream side and downstream side 6, 8, 9, 11 and short tube type upstream side and downstream side casing 7, 10 of the above-mentioned embodiments 1 and 2 (see Fig. 2, 3 and Table 3). the

Therefore, according to the four confluent drainage manholes 1' of Embodiment 3, since the sleeve sockets 210a-214a, 210b provided on the main body 200 are standardized to a given number of sockets with a certain shape Therefore, connecting the above-mentioned socket ports 210a to 214a, 210b and the upstream casing and downstream casing of the connected round pipes 3 to 5, only by selecting according to the type and diameter of the round pipe, it is possible to connect different types and different diameters. The round pipe makes the piping construction very easy. In addition, in the present invention, since the rubber wheel joint is used for the connection of the drainage manhole and the round pipe, even if there is some deviation in the connection angle of the round pipe due to simple construction, the deviation angle can be easily absorbed. the

In addition, the design conditions of the casing sockets installed in the drainage manholes organized on the basis of the nominal diameter of the ribbed pipe are not limited to physical constraints, and the nominal diameter, number, arrangement and configuration of the sockets can be freely designed. The combination thereof is not particularly limited. the

As a result of the above, according to the present invention, even if the circular pipes connected to the drainage manholes are circular pipes of different types and/or different calibers, by selecting a drainage manhole consistent with the largest nominal diameter among them, it is possible to connect different types of pipes. , Different diameter round tube. In addition, according to the present invention, since the rubber wheel joint is used for connecting the drainage manhole and the round pipe, even if there is some deviation in the connection angle of the round pipe due to simple construction, the deviation angle can be easily absorbed. the

In addition, even if the type or diameter of the installed piping at the position where the drain manhole is installed is unclear, or the actual diameter of the pipe varies depending on the manufacturer, the number of drain manholes that should be prepared in advance can be greatly reduced. As a result, the construction cost of drainage manhole installation work can be significantly reduced. the

Also, according to the present invention, since the basic structure of the main body of the drainage manhole is the same as that of a general resin drainage manhole, the existing injection molding machine can be used to manufacture the drainage manhole, and since there is no need for a new drainage manhole in principle, Therefore, the drainage manhole of the present invention can be produced at low cost.

Claims (8)

1. A drainage manhole for connecting circular pipes of different types and different diameters, comprising: The main body of the drainage manhole, which is provided with an upwardly facing inspection cylinder connection part, and a casing socket for connecting the casing on the upstream side and the downstream side; The casing on the upstream side has a drain manhole body socket at one end for fitting with the casing socket and connecting with the drain manhole body, and has a round pipe socket at the other end for rubber wheel engagement with the round pipe mouth; There is also a downstream casing, which has at one end a drain manhole body socket for fitting with the casing socket and connecting with the drain manhole body, and has a round pipe at the other end for engaging with a round pipe with a rubber wheel. pipe socket, characterized in that, The inner diameter of the casing socket on the upstream side of the main body of the drainage manhole and the internal diameter of the casing socket on the downstream side are determined by the maximum nominal diameter of the connected round pipe, and the outer diameter of the main body socket of the upstream casing and the inner diameter of the circular pipe socket, and the outer diameter of the main body socket of the downstream casing and the outer diameter of the circular pipe socket, are determined by the combination of the drainage manhole main body and the type of the circular pipe and the drainage manhole main body Determined in combination with the nominal diameter of the round pipe. 2. The drainage manhole for connection of heterogeneous and different-diameter circular pipes according to claim 1, characterized in that, The shape of the casing socket is organized based on the nominal diameter of the circular pipe being a ribbed pipe, wherein the shape of the casing socket refers to the flow path of the main body of the drainage manhole ( d _fa , d _f b), the inner diameter of the casing socket (d _s a, d _s b), the step height inside the casing socket (h _s a, h _s b). 3. The drainage manhole for connection of heterogeneous and different-diameter circular pipes according to claim 2, characterized in that, The flow path of the sleeve socket is determined to be equal to the inner diameter of the ribbed tube within the group. 4. The drainage manhole for connection of heterogeneous and different-diameter circular pipes according to claim 2, characterized in that, The inner diameter of the upstream casing socket is determined to be equal to the value obtained by adding the outer diameter of the ribbed pipe to the thickness of the upstream casing twice the thickness of the upstream casing, or the downstream side The inner diameter of the bushing socket is determined to be equal to the value obtained by adding the outer diameter of the ribbed pipe to twice the thickness of the downstream side bushing in the group. 5. The drainage manhole for connection of heterogeneous and different-diameter circular pipes according to claim 2, characterized in that, The casing socket on the upstream side is provided with a step difference in the circumferential direction inside it, and the step difference is determined to be equal to the value obtained by dividing the difference between the inner and outer diameters of the ribbed pipe by 2 plus the above-mentioned The subsequent value of the thickness of the casing on the upstream side, or the socket of the casing on the downstream side, is provided with a step difference in the circumferential direction inside it, and the step difference is determined to be equal to dividing the difference between the inner and outer diameters of the ribbed pipe in the group. Add the value after 2 to the thickness of the casing on the downstream side. 6. The drainage manhole for connection of heterogeneous and different-diameter circular pipes according to claim 1, characterized in that, Each shape of the upstream casing or the downstream casing is distinguished by color. 7. The drainage manhole for connection of heterogeneous and different-diameter circular pipes according to claim 1, characterized in that, The casing on the upstream side includes: the circular pipe socket of the casing is reduced in diameter from the socket of the drainage manhole main body of the casing, Alternatively, the casing on the downstream side includes: the circular pipe socket of the casing is reduced in diameter from the socket of the drainage manhole main body of the casing. 8. The drainage manhole for connecting circular pipes of different types and different diameters according to claim 7, characterized in that, The central axis of the drain manhole main body socket of the upstream side casing is eccentric with respect to the central axis of the round pipe socket of the upstream side casing, so that the drainage manhole main body socket at the pipe bottom of the upstream side casing is eccentric. The height of the inner peripheral surface is substantially the same as the height of the inner peripheral surface of the circular pipe socket, or the central axis of the outlet of the drainage manhole main body of the downstream casing is relative to the circular pipe socket of the downstream casing. The central axis is eccentric, so that the height of the inner peripheral surface of the drain manhole main body socket at the pipe bottom of the downstream side casing substantially coincides with the height of the inner peripheral surface of the circular pipe socket.

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