JP7407995B2 - drainage system - Google Patents

Description

TECHNICAL FIELD The present invention relates to drainage systems.

Conventionally, rainwater basins have been placed in side gutters of bridges to drain rainwater (for example, see Patent Document 1).

The rainwater tank shown in Patent Document 1 includes a main body, an upper cell placed on the upper part of the main body, and a metal lid placed on the upper cell, and a drainage pipe is connected to the lower end of the main body. . Rainwater flowing in from the metal lid flows into the drainage pipe through the rainwater basin.

Japanese Patent Application Publication No. 2016-156243

However, in rainwater drainage with a conventional configuration, foreign objects moving on the road surface may also flow into the drainage pipes as the rainwater is drained, and the foreign objects may stay in the pipes and cause clogging. For this reason, it is necessary to periodically inspect the inside of the pipes and perform high-pressure cleaning if a blockage occurs, but this poses problems such as difficulty in confirming the location of the blockage.

An object of the present invention is to provide a drainage system that can reduce the flow of foreign matter into a drainage port.

In order to achieve the above object, a drainage system according to a first invention includes a metal lid, a drainage basin, and a drainage member. The drainage basin has an opening and a water stop surface. A metal lid is placed over the opening. The water stop surface is arranged below the opening and stops water flowing from the opening. The drainage member has a lid member and a drain port, is arranged inside the drainage basin portion, and induces the occurrence of a siphon effect in water drained by a pipe connected to the drain port. The drain port is formed facing the lid member. The drain port is located above the water stop surface.

This allows foreign matter to accumulate in the space between the drain port and the water stop surface, thereby reducing the amount of foreign matter flowing into the drain port.

In addition, it is possible to generate a siphon phenomenon and realize high flow rate drainage with a small diameter. Therefore, it is possible to use piping with a smaller diameter than in the past, which reduces weight and improves work efficiency, and because less material is required, costs can also be reduced.

A drainage system according to a second invention is the drainage system according to the first invention, in which the drainage basin section further includes a constriction section disposed below the opening and having a smaller area than the opening. The drain port is arranged between the constriction part and the opening part.

As a result, foreign matter that has flowed into the constriction section from the opening along with rainwater is collected in the space of the constriction section, so that it is possible to reduce the inflow of foreign matter into the drain port.

A drainage system according to a third invention is the drainage system according to the first or second invention, in which the drainage member has a lower cell and an upper cell. The lower cell has a constriction part. The upper cell has an opening and is placed above the lower cell.

Thereby, the drainage basin portion can be formed by at least two members, the upper basin and the lower basin. Further, the materials of the upper and lower cells can be changed; for example, the upper cell can be made of metal and the lower cell can be made of FRP (Fiber Reinforced Plastics).

A drainage system according to a fourth invention is the drainage system according to the first or second invention, in which the drainage basin portion has a bottom surface that forms a water stop surface.
This allows rainwater to be stopped at the bottom of the drainage basin.

A drainage system according to a fifth invention is the drainage system according to the second invention, in which the drainage basin has a water stop member. The throttle part has a cylindrical shape extending toward the water stop surface. The water stop member covers the tip of the constriction portion. The water stop member forms a water stop surface.
Such a water stop member forms a water stop surface and can stop rainwater.

A drainage system according to a sixth invention is the drainage system according to the second invention, in which the drainage basin portion has an area perpendicular to the opening that gradually decreases from the opening toward the constriction portion. It is formed.
This allows rainwater that has flowed into the opening to flow forcefully into the constriction part.

A drainage system according to a seventh invention is the drainage system according to any one of the first to sixth inventions, wherein the water stop surface is penetrated by a pipe connected to a drain port of the drainage member.
As a result, the area around the pipe is used as a space for collecting foreign matter.

A drainage system according to an eighth invention is the drainage system according to any one of the first to seventh inventions, in which the drainage member has an opening to the pipe, and the opening is connected to the drainage port. The lid member is arranged to close the opening when viewed from above in the vertical direction, and the projected area of the lid member with respect to a plane perpendicular to the vertical direction is set to be larger than the projected area of the opening.

Thereby, even when the drainage member is disposed diagonally, the siphon phenomenon can be generated.

A drainage system according to a ninth invention is the drainage system according to any one of the first to eighth inventions, and is provided in a side gutter of a bridge.

This allows for efficient drainage of rainwater that falls on the bridge.

According to the present invention, it is possible to provide a drainage system that can reduce the amount of objects flowing into the drainage port.

FIG. 1 is a diagram showing a state in which a drainage system according to an embodiment of the present invention is installed on a bridge. 1 is a schematic cross-sectional view showing the configuration of a drainage system according to an embodiment of the present invention. 3 is an exploded perspective view showing the metal lid and drainage basin section 20 of FIG. 2. FIG. FIG. 3 is a perspective view showing the siphon drain member of FIG. 2; FIG. 3 is a perspective sectional view showing the siphon drain member of FIG. 2; Front view of FIG. 5. The figure which shows the structure of the drainage system of a present Example. The figure which shows an example of the piping connection structure of the drainage system of a present Example. (a) Exploded view of the piping connection structure of FIG. 8, (b) A perspective view of the cap of FIG. 9(a) viewed from the bottom side. It is a figure showing the composition of the drainage system of a comparative example. FIG. 2 is a diagram showing a table of the results of Examples 1 and 2 and Comparative Examples 1 to 3. The cross-sectional schematic diagram which shows the structure of the drainage system in the modification of embodiment concerning this invention.

EMBODIMENT OF THE INVENTION Below, the drainage system based on embodiment of this invention is demonstrated based on drawing.
<Configuration>
(Overview of drainage system 1)
FIG. 1 is a diagram showing a drainage system 1 according to an embodiment of the present invention installed on a bridge. As shown in the figure, a plurality of drainage systems 1 according to the present embodiment are arranged along the side gutter of a bridge 200. Rainwater falling on the bridge 200 flows into the drainage system 1 and is drained outside the bridge 200.

FIG. 2 is a schematic cross-sectional view showing the configuration of the drainage system 1 of this embodiment.
As shown in FIG. 2, the drainage system 1 of this embodiment includes a metal lid 10, a drainage basin section 20, and a siphon drain member 30.

(metal lid)
FIG. 3 is an exploded perspective view of the metal lid 10 and the drainage basin section 20.

The metal lid 10 is a metal lid having a plurality of holes. The plurality of holes may have any shape as long as it does not impede the inflow of rain; for example, they may be formed in a mesh shape like a grating, or may have a plurality of rectangular holes. The metal lid 10 is supported by a drainage basin part 20, and rainwater flows into the drainage basin part 20 from the metal lid 10. Although the metal lid 10 has a rectangular shape as an example in this embodiment, it is not limited to this and may have a polygonal shape other than a square, a circle, or an ellipse.

(Drainage basin)
The drainage basin section 20 has an upper basin 21, a lower basin 22, and a height adjustment part 23. The upper cell 21 is made of metal and is a frame placed around the metal lid 10. The inside of the upper cell 21 corresponds to the opening 20a of the drainage cell 20, and the metal lid 10 is disposed thereon.

The upper cell 21 has a side wall 41 and a lid placement part 42. The side wall 41 is formed to surround the metal lid 10. The lid mounting portion 42 is formed approximately perpendicularly to the side wall 41 from the lower end of the side wall 41 toward the inside. The metal lid 10 is placed on the lid placement part 42.

The lower cell 22 is made of FRP, for example, and includes a side wall 51, an upper cell support portion 52, a constriction portion 53, a connecting portion 54, and a formwork tube 55.

The side wall 51 is formed to surround the upper cell 21 . The upper cell support portion 52 is formed approximately perpendicularly to the side wall 51 from the lower end of the side wall 51 toward the inside. The upper cell 21 is supported by the upper cell support section 52 . The upper cell support section 52 and the lid placement section 42 are provided with a height adjustment section 23 that adjusts the height position of the upper cell 21 with respect to the lower cell 22.

The aperture part 53 has a cylindrical appearance and is provided below the upper cell support part 52. The constricted portion 53 has a cylindrical portion 53a and a bottom surface 53b. The aperture upper part 53c, which is the upper end of the cylindrical part 53a, is connected to the upper cell support part 52 by a connecting part 54, which will be described later. The bottom surface 53b is arranged so as to close the lower end, which is the tip of the cylindrical portion 53a.

Furthermore, as shown in FIG. 2, the diaphragm portion 53 is disposed closer to one of the left and right than the center of the opening 20a in the left-right direction. A through hole 53d is formed in the bottom surface 53b, and a pipe 90 inserted through the through hole 53d is provided.

As the pipes (including the pipe 90) used in the drainage system 1 of this embodiment, for example, those having a diameter of 75A to 125A can be used. The pipe 90 is arranged generally perpendicular to the bottom surface 53b, and its upper end is located inside the drainage basin section 20. The bottom surface 53b functions as a water stop surface that stops rainwater from leaking downward from the drainage basin section 20. Further, the bottom surface 53b corresponds to the lower end of the aperture part 53, which is the lower part of the aperture. Note that the space between the bottom surface 53b and the pipe 90 may be filled with a water stop agent or the like, or a cap-shaped member may be used as in the embodiment described later.

The connecting portion 54 connects the upper cell support portion 52 and the constriction portion 53. The connecting portion 54 connects the inner end of the upper cell support portion 52 to the upper end of the cylindrical portion 53a of the throttle portion 53. The connecting portion 54 is formed such that the cross-sectional area in the direction perpendicular to the opening 20a gradually decreases from the upper cell support portion 52 toward the constriction portion 53.

The formwork tube 55 has a cylindrical shape and is arranged around the cylindrical portion 53a of the constricted portion 53. The form pipe 55 protects the constricted portion 53 and the like from the concrete 201.

The height adjustment section 23 adjusts the height position of the upper cell 21 with respect to the lower cell 22. The height adjustment section 23 includes a bolt 61 and a nut 62. The bolt 61 is inserted into a through hole formed in the upper cell support portion 52. The bolt 61 is arranged substantially perpendicular to the upper cell support portion 52. The head 61a of the bolt 61 is in contact with the lid mounting portion 42 of the upper cell 21 from below. The nut 62 is fixed to the upper cell support portion 52 so as to be coaxial with the through hole. A bolt 61 is inserted through the nut 62. By changing the amount by which the bolt 61 is screwed into the nut 62, the height of the upper cell 21 relative to the lower cell 22 can be changed. The height adjustment section 23 may be provided on all of the opposing long sides and opposing short sides of the upper cell support section 52, or may be provided on only one of them.

Here, as shown in FIG. 2, concrete 201 is provided up to the upper end of the lower cell 22, and pavement 202 is provided above the concrete 201. The upper end of the pavement 202 and the upper end of the upper square 21 generally coincide with each other. The position of the upper cell 21 relative to the lower cell 22 can be adjusted by the height adjustment section 23 so as to match the thickness of the pavement 202.

(Siphon drain member)
The siphon drain member 30 (an example of a drainage member) induces the occurrence of a siphon phenomenon in water drained into the connected pipe 90. The siphon drain member 30 is a drainage member having a high drainage function for improving the drainage capacity of rainwater flowing into the drainage basin section 20.

FIG. 4 is a perspective view showing the siphon drain member 30. FIG. 5 is a perspective cross-sectional view of the siphon drain member 30. FIG. 6 is a front view of FIG. 5.

The siphon drain member 30 can be made by injection molding using a synthetic resin such as hard vinyl chloride resin, polycarbonate, ABS, or AES. Note that the material is not limited to synthetic resin, and may be made of cast iron using a mold.

The siphon drain member 30 includes a lid member 31, a mounting tube 32, and a plurality of vertical ribs 33.

The lid member 31 is plate-shaped and formed into a disk shape. The mounting cylinder 32 is formed into a cylindrical shape. The central axes of the lid member 31 and the mounting tube 32 are arranged on a common axis and coincide with each other in the vertical direction. This common axis is defined as a drain axis O, the mounting cylinder 32 of the siphon drain member 30 along the direction of the drain axis O is defined as the lower side, and the side of the lid member 31 is defined as the upper side. Further, in a plan view of the siphon drain member 30 from the direction of the drain axis O, the direction perpendicular to the drain axis O is defined as the radial direction, and the direction in which the siphon drain member 30 goes around the drain axis O is defined as the circumferential direction.

The mounting tube 32 has a tube portion 71 that forms the drop opening 34 and a plate-shaped collar portion 72 that extends radially outward from the upper end of the tube portion 71 . The connecting portion 32a on the inner surface side where the cylinder portion 71 and the flange portion 72 are connected is formed in a bell mouth shape with a tapered surface or a curved surface. When the connecting portion 32a is a curved surface, the radius of curvature of the cross section in the direction parallel to the drain axis O is preferably 5 mm to 20 mm.

The droplet part 34 is a part that drains rainwater, and the opening at the upper end of the droplet part 34 (which can also be called the inner side of the upper end of the cylindrical part 71) is the drain port 34a. The drain port 34a can also be said to be inside the collar portion 72. The distance from the drain port 34a to the lid member 31 is approximately the same as the distance from the collar portion 72 to the lid member 31. In the direction along the drain axis O, the positions of the drain port 34a and the collar portion 72 generally coincide.

The opening 34b of the droplet portion 34 is located below the drain port 34a and has a constant diameter, and the opening diameter of the opening 34b is indicated as R1 (see FIG. 6). Further, the area of the opening 34b having an opening diameter of R1 is defined as the opening area of the droplet portion 34. Note that the opening diameter R1 corresponds to the inner diameter of the cylindrical portion 71, and the opening area of the droplet portion 34 corresponds to the area whose diameter is the inner diameter of the cylindrical portion 71. Moreover, the diameter gradually increases from the opening 34b toward the drain port 34a due to the connecting portion 32a.

Also, in this embodiment. Since the drain axis O, which is the central axis of the siphon drain member 30, coincides with the vertical direction, the area of the lid member 31 and the opening area of the droplet 34 are the projection of the lid member 31 on a plane perpendicular to the vertical direction. This corresponds to the area and the projected area of the opening of the droplet portion 34. In this embodiment, the outer diameter of the lid member 31 and the outer diameter of the flange 72 are formed to be substantially the same.

The siphon drain member 30 is arranged, for example, by inserting the cylindrical portion 71 into the pipe 90 from above.

As shown in FIGS. 4 and 5, a portion formed between the outer circumferential edge 31a of the lid member 31 and the outer circumferential edge 72a of the collar portion 72 is an inflow opening through which rainwater flows into the drain port 34a of the droplet portion 34. 30a (see arrow B in FIG. 5). The size and height shape of the lid member 31 are adjusted so that the area of the inflow opening 30a is larger than the opening area (portion with diameter R1) of the opening 34b of the droplet portion 34.

As shown in FIG. 5, the plurality of vertical ribs 33 connect the upper surface 72d of the flange portion 72 of the mounting tube 32 and the outer peripheral portion of the lower surface 31c of the lid member 31. The lid member 31 is supported from below by a plurality of vertical ribs 33, and is supported at a position at a predetermined height H1 from the mounting tube 32, as shown in FIG. The plurality of vertical ribs 33 are provided in the inflow opening 30a, are formed along the radial direction in plan view, and are formed to intersect with the circumferential direction. The vertical ribs 33 have a function of rectifying rainwater flowing into the droplet 34 from the inflow opening 30a. In this embodiment, six vertical ribs 33 are formed, and the six vertical ribs 33 are provided at equal intervals (approximately 60 degree intervals) around the drain axis O. It is not limited.

The lid member 31 is arranged so as to close the opening 34b of the droplet portion 34 when viewed from above in the vertical direction. Further, the area of the lid member 31 is set to be larger than the opening area (portion of diameter R1) of the opening 34b of the droplet portion 34. Note that in this embodiment, the center of the lid member 31 and the center of the opening of the droplet portion 34 are aligned in the vertical direction, but in the case where the lid member 31 and the droplet portion 34 are both tilted and disposed diagonally. If the lid area of the lid member 31 is the same as the opening area of the droplet part 34, the opening 34b of the droplet part 34 cannot be closed when viewed from the vertical direction, and the lid member 31 and the droplet part 34 cannot be closed. A gap (an air core caused by the eddy current) is created between the two.

Therefore, it is preferable that the projected area of the lid member 31 with respect to a plane perpendicular to the vertical direction be set larger than the projected area of the opening 34b of the droplet portion 34.

The lid diameter R2 or the minimum width dimension of the lid member 31 is larger than the opening diameter R1 of the droplet portion 34 (the diameter R1 of the opening 34b) and is 245% or less of the opening diameter R1. Furthermore, when the height from the outer peripheral edge 72a of the flange 72 of the lid member 31 is H1, and the opening diameter is R1, the value of R1/H1 satisfies the range of 1.3 to 8.0, and H1 is 10 It is preferable that the opening area satisfies the range of ˜60 mm and the opening area is 30 cm 2 or more and 190 cm 2 or less.

Note that the upper surface 31b of the lid member 31 is provided with gripping ribs 35 that protrude upward and are arranged at intervals in the circumferential direction. The gripping rib 35 is gripped by an operator when connecting the siphon drain member 30 to the pipe 90.

(Position of siphon drain member in drainage basin)
Next, the position of the siphon drain member 30 inside the drainage basin section 20 will be described.

In this embodiment, as shown in FIG. 2, the drain port 34a of the siphon drain member 30 is arranged at a higher position than the bottom surface 53b.

Thereby, as shown in FIG. 2, a space S is formed between the collar portion 72 and the bottom surface 53b. This space S (see the dotted part in FIG. 2) functions as a dirt storage section, and foreign matter flowing in with rainwater is collected in the space S.

Further, in this embodiment, the siphon drain member 30 is arranged such that the drain port 34a is located above the throttle upper part 53c (indicated by position P1), which is the upper end of the throttle part 53. Thereby, the entire constriction section 53 can function as a dust collection section. Furthermore, there is no need to insert a hand into a narrow place such as the constriction part 53 to grasp the gripping rib 35, making it easier to connect the siphon drain member 30 and the pipe 90.

<Effect>
Rainwater that has fallen on the bridge 200 flows from the metal lid 10 into the constriction part 53 along the connecting part 54 (see arrow A), as shown in FIG. Foreign matter flowing in with the rainwater is collected in the space S, and when the water level exceeds the collar 72, the excess rainwater flows into the drain port 34a and is drained from the pipe 90. At this time, a siphon phenomenon is induced by the siphon drain member 30, and rainwater can be efficiently drained even if the pipe is thin.

Further, by periodically removing dust accumulated in the space S, the frequency of high-pressure cleaning can be reduced, and the cost of inspection and cleaning can be reduced.

(Example)
Next, the drainage system of this embodiment will be explained using an example.

FIG. 7 is a diagram for explaining the configuration of the drainage system 1 of this embodiment. FIG. 8 is a diagram showing an example of the pipe connection structure 80 of the drainage system 1 of this embodiment. FIG. 9(a) is an exploded view of the piping connection structure 80 of FIG. 8. FIG. 10 is a diagram showing the configuration of a drainage system 1000 of a comparative example. The drainage system 1000 of the comparative example differs from the drainage system 1 of the example in that the siphon drain member 30 is not provided and the position of the drainage port is at the same position as the bottom surface 83a described later, and other points. The configuration is the same as in the embodiment.

In this embodiment, a lower cell 22' is used, and the metal lid 10 and upper cell 21 are not provided. Furthermore, as shown in FIG. 7, the constricted part 53' of the lower cell 22' is different from the constricted part 53 of the above embodiment in that it is not provided with a bottom surface 53b but only has a cylindrical part 53a'.

As shown in FIG. 7, an elbow joint 91 is connected to the lower end of the pipe 90, and a pipe 92 is connected to the elbow joint 91. The pipe 92 has no slope and extends from the elbow joint 91 in the horizontal direction. An elbow joint 93 is connected to the other end of the pipe 92, and a pipe 94 is connected to the elbow joint 93. Piping 94 extends downward from elbow joint 93. An elbow joint 95 is arranged at the lower end of the pipe 94, and a pipe 96 is connected to the elbow joint 95. The pipe 96 extends horizontally from the elbow joint 95 without any slope. An elbow joint 97 is connected to the other end of the pipe 96, and the other end of the elbow joint 97 faces downward and is connected to a drainage basin.

Further, the length of the long side of the lower cell 22' is set to 500 mm, the length of the pipe 90 is set to 500 mm, the length of the pipe 92 is set to 5000 mm, and the length of the pipe 94 is set to 5000 mm. , the length of the pipe 96 is set to 1500 mm.

The piping connection structure 80 of this embodiment includes a socket 81, a tube 82, a cap 83, a socket 84, and a tube 85, as shown in FIGS. 8 and 9(a). The socket 81 is a joint for a vinyl chloride pipe, into which the cylindrical portion 71 of the siphon drain member 30 is inserted from above. The pipe 82 is a vinyl chloride pipe and is inserted into the socket 81 from below. By adjusting the length of this tube 82, the height position of the siphon drain member 30 can be changed.

The cap 83 is a joint for a vinyl chloride pipe. FIG. 9(b) is a perspective view of the cap 83 viewed from the bottom side. The cap 83 is arranged such that the lower end of the cylindrical portion 53a' of the constricted portion 53' is inserted inside the cap 83. As shown in the figure, the cap 83 has a hole 83b having an outer diameter of the tube 82 plus 1 mm at the center of the bottom surface 83a. The tube 82 is inserted through the hole 83b. In addition, in this embodiment, the bottom surface 83a of the cap 83 corresponds to the bottom surface 53b of the constriction part 53 in FIG. 2, and forms a water stop surface. Further, the hole 83b corresponds to the through hole 53d in FIG.

The socket 84 is a joint for a vinyl chloride pipe, and connects the pipe 82 and the pipe 85. The socket 84 is arranged for positioning and supporting the cap 83. Pipe 85 is a vinyl chloride pipe, and is inserted into socket 84 from below. The socket 81, the pipe 82, the socket 84, and the pipe 85 constitute the piping 90 described above. Further, the cap 83 is included in the drainage basin section together with the lower basin 22'.

As shown in FIG. 8, the tube 85 is fixed by a U band 87 and an angle 86 so as not to come off. Further, a silicone sealant (manufactured by Sekisui Chemical Co., Ltd.) 88 is applied over the entire circumference between the upper end of the cap 83 and the constricted portion 53' to seal it. Further, a silicon sealant (manufactured by Sekisui Chemical Co., Ltd.) 89 is applied over the entire circumference between the socket 84 and the cap 83 to seal it.

Further, as shown in FIG. 8, the height from the bottom surface 83a of the cap 83 to the drain port 34a of the siphon drain member 30 is H2. The height of H2 can be changed by changing the length of the tube 82 mentioned above.

In Examples 1 and 2 and Comparative Examples 1 to 3, the sizes of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96, the presence or absence of the siphon drain member 30, and the position of the drain port 34a from the throttle top 53c were determined. For each configuration, the presence or absence of a siphon phenomenon, the amount discharged when 50 g of earth and sand was put into the lower cell 22', and the flow rate of drainage water were measured.

In Example 1, the sizes of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 are set to 75A, the height H1 from the drain port 34a of the siphon drain member 30 to the lid member 31 is set to 50 mm, and the height H2 was set to 145mm. At this time, a siphon phenomenon occurred, the drainage flow rate was 20 L/s, and no foreign matter was observed to be discharged from the elbow joint 97.

In Example 2, the sizes of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 were 100A, the height H1 was set to 50 mm, and the height H2 was set to 155 mm. At this time, a siphon phenomenon occurred, the drainage flow rate was 30 L/s, and no foreign matter was observed to be discharged from the elbow joint 97.

In Comparative Example 1, the sizes of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 were set to 75A, and the position of the drain port (the position of the upper end 81a of the socket 81) was made to match the bottom surface 83a of the constriction part 53'. Ta. At this time, a vortex was generated and no siphon phenomenon occurred, the drainage flow rate was 13 L/s, and foreign matter was observed to be discharged from the elbow joint 97, and the amount of foreign matter was 30 g.

In Comparative Example 2, the sizes of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 were set to 100A, and the position of the drain port (the upper end position of the socket 81) was made to match the bottom surface 83a of the constricted portion 53'. At this time, a vortex was generated and no siphon phenomenon occurred, the drainage flow rate was 18 L/s, and foreign matter was observed to be discharged from the elbow joint 97, and the amount of foreign matter was 35 g.

In Comparative Example 3, the sizes of the pipes 82 and 85 of the pipe 90 and the pipes 92, 94, and 96 were set to 200A, and the position of the drain port (the upper end position of the socket 81) was made to match the bottom surface 83a of the constricted portion 53'. At this time, a vortex was generated and no siphon phenomenon occurred, the drainage flow rate was 30 L/s, and foreign matter was observed to be discharged from the elbow joint 97, and the amount of foreign matter was 28 g.

As described above, the siphon phenomenon can be caused by arranging the siphon drain member 30. Further, by providing a space S between the bottom surface 83a and the drain port 34a, it is possible to suppress foreign matter from flowing into the piping 90.

Further, by generating a siphon phenomenon, a high drainage flow rate can be achieved even when the pipe diameter is small.

(Features, etc.)
(1)
The drainage system 1 of this embodiment includes a metal lid 10, a drainage basin section 20, and a siphon drain member 30 (an example of a drainage member). The drainage basin section 20 has an opening 20a and a bottom surface 53b (an example of a water stop surface). The metal lid 10 is placed in the opening 20a. The bottom surface 53b is arranged below the opening 20a and stops water flowing in from the opening 20a. The siphon drain member 30 (an example of a drainage member) has a lid member 31 and a drain port 34a, and is disposed inside the drainage basin portion 20, and is connected to the water drained by a pipe 90 connected to the drain port 34a. Induces the occurrence of siphon phenomenon. The drain port 34a is formed facing the lid member 31. The drain port 34a is arranged above the bottom surface 53b.

Thereby, foreign matter can be collected in the space S between the drain port 34a and the bottom surface 53b, so that the inflow of foreign matter into the drain port 34a can be reduced.

In addition, it is possible to generate a siphon phenomenon and realize high flow rate drainage with a small diameter. For this reason, it is possible to use piping with a smaller diameter than in the past, which reduces weight and improves work efficiency, and because less material is required, costs can also be reduced.

(2)
In the drainage system 1 of this embodiment, the drainage basin section 20 further includes constricted sections 53 and 53' that are arranged below the opening 20a and have a smaller area than the opening 20a. The drain port 34a is arranged between the constriction portion 53 and the opening portion 20a.

Thereby, foreign matter that has flowed into the constriction part 53 from the opening 20a along with rainwater is collected in the space S including the constriction part 53, so that it is possible to reduce the inflow of foreign matter into the drain port 34a.

(3)
In the drainage system 1 of this embodiment, the drainage basin section 20 includes a lower basin 22 and an upper basin 21. The lower cell 22 has a constriction part 53. The upper cell 21 has an opening 20a and is arranged above the lower cell 22.

Thereby, the drainage basin section 20 can be formed by at least two members, the upper basin 21 and the lower basin 22. Further, the materials of the upper cell 21 and the lower cell 22 can be changed; for example, the upper cell 21 can be made of metal and the lower cell 22 can be made of FRP (Fiber Reinforced Plastics).

(4)
In the drainage system 1 of this embodiment, the drainage basin section 20 has a bottom surface 53b that forms a water stop surface.
Thereby, rainwater can be stopped at the bottom surface 53b of the drainage basin section 20.

(5)
In the drainage system 1 of the present embodiment, the drainage basin section 20 includes a cap 83 (an example of a water-stopping member). The constricted portion 53' has a cylindrical shape extending toward the water stop surface. The cap 83 covers the tip of the constricted portion 53'. The cap 83 forms a water stop surface.
Such a cap 83 forms a water stop surface and can stop rainwater.

(6)
In the drainage system 1 of the present embodiment, the drainage basin section 20 is formed such that the area perpendicular to the opening section 20a gradually decreases from the opening section 20a toward the constricted sections 53 and 53'. There is.

Thereby, the rainwater that has flowed into the opening 20a can flow into the throttle part 53 with force.

(7)
In the drainage system 1 of the present embodiment, a pipe 90 connected to the drain port 34a of the siphon drain member 30 passes through the bottom surface 53b or the bottom surface 83a (an example of a water-stop surface).
Thereby, the area around the pipe 90 is used as a space S for storing foreign matter.

(8)
In the drainage system 1 of this embodiment, the siphon drain member 30 has an opening 34b to the pipe 90, and the opening 34b is connected to the drain port 34a. The lid member 31 is arranged to close the opening 34b when viewed from above in the vertical direction, and the projected area of the lid member 31 with respect to a plane perpendicular to the vertical direction is set to be larger than the projected area of the opening 34b.

Thereby, even when the siphon drain member 30 is disposed diagonally, the siphon phenomenon can occur.

(9)
The drainage system 1 of this embodiment is provided in a side gutter of a bridge 200.

Thereby, rainwater that has fallen on the bridge 200 can be efficiently drained. Further, since the bridge 200 is tall, it is easy to cause a siphon phenomenon, and is suitable for using the siphon drain member 30.

[Other embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention.

(A)
In the above embodiment, the drainage basin section 20 is divided into the upper basin 21 and the lower basin 22, but the upper basin 21 and the lower basin 22 may be integrally configured. In this case, the height adjustment section 23 may not be provided. For example, the structure may be such that the metal lid 10 is placed directly on the lower cell 22 in FIG.

(B)
In the embodiment described above, the aperture part 53 is provided in the lower cell 22, but the aperture part 53 may not be provided. FIG. 12 is a diagram showing a drainage system 101 using a drainage basin section 120 including a lower basin 122 in which a constriction section 53 is not formed. The bottom surface 122a of the lower cell 122 is formed to have a smaller area than the opening 20a. The drain port 34a is arranged above the bottom surface 122a, and a space S' in the lower cell 122 between the bottom surface 122a and the drain port 34a serves as a garbage reservoir.

Although the siphon drain member 30 is arranged inside the drainage basin parts 20 and 120, a part of the siphon drain member 30 may protrude from the drainage basin parts 20 and 120. To explain specifically using FIG. 12, in FIG. 12, the cylindrical portion 71 of the siphon drain member 30 is generally aligned with the outer surface of the bottom surface 122a of the drainage basin portion 120; may protrude from the outer surface of the

(C)
In the above embodiment, the upper cell 21 is made of metal and the lower cell 22 is made of FRP, but the present invention is not limited to this. The upper cell 21 may be made of FRP, and the lower cell 22 may be made of metal.

(D)
In the embodiment described above, the cylindrical portion 71 is inserted into the pipe 90, and in the example, the siphon drain member 30 is inserted into the socket 81, but the present invention is not limited to this. For example, a male thread is formed on the outer periphery of the cylindrical portion 71, and a female thread is formed on the inside of the upper end member (for example, the socket 81) of the pipe 90, and the male thread and the female thread are screwed together to connect the cylindrical portion 71 and the pipe 90. may be connected. Further, the cylindrical portion 71 and the pipe 90 may be connected with adhesive or the like.

(E)
In the embodiment described above, the aperture portion 53 is disposed closer to one of the left and right than the center of the opening 20a in the left-right direction as shown in FIG. 2, but the present invention is not limited thereto. For example, the opening 20a may be centrally located.

The drainage system of the present invention has the effect of reducing the inflow of foreign matter into the drainage port, and is useful as a rainwater drainage system placed on a bridge or the like.

1: Drainage system 10: Metal lid 20: Drainage basin 20a: Opening 30: Siphon drain member
34a: Drain port 53b: Bottom

Claims (10)

metal lid and
a drainage basin portion having an opening in which the metal lid is disposed, and a water stop surface disposed below the opening to stop water flowing from the opening;
Water that has a drain port and a plurality of vertical ribs formed upward from the periphery of the drain port, is disposed inside the drain basin , and is drained by a pipe connected to the drain port. a drainage member that induces the occurrence of a siphon phenomenon;
In plan view, each of the plurality of vertical ribs is formed along the radial direction of the drain port, and the plurality of vertical ribs are formed to intersect with the circumferential direction of the periphery of the drain port. ,
Water flowing into the drainage basin from the opening flows between the adjacent vertical ribs and flows into the drainage port,
The drain port is located above the water stop surface,
drainage system. The drainage basin section further includes a constriction section having an area smaller than the opening section,
The drain port is arranged between the constriction part and the opening part,
A drainage system according to claim 1. The drainage member further includes a cylindrical portion in which the drain port is formed at an upper end, and a flange portion extending radially outward from the upper end of the cylindrical portion in the radial direction of the drain port in the plan view,
The plurality of vertical ribs are arranged on the collar portion,
A drainage system according to claim 1. The drainage basin section is
a lower cell having the constriction part;
an upper cell having the opening and disposed above the lower cell;
A drainage system according to claim 2. The drainage basin portion has a bottom surface that forms the water stop surface.
A drainage system according to claim 1 or 2. The throttle part has a cylindrical shape extending downward toward the water stop surface,
The drainage basin section includes a water stop member that covers the tip of the constriction section,
the water stop member forms the water stop surface;
A drainage system according to claim 2. The drainage basin portion is formed such that an area perpendicular to the opening portion gradually decreases from the opening portion toward the constriction portion.
A drainage system according to claim 2. The water stop surface is penetrated by piping connected to the drain port of the drainage member.
Drainage system according to any one of claims 1 to 7. The drainage member is
a lid member formed to face the drain port and supported from below by the vertical ribs;
an opening to the piping;
The opening is located below the drain port and is connected to the drain port,
The lid member is arranged to close the opening when viewed from above in the vertical direction, and a projected area of the lid member with respect to a plane orthogonal to the vertical direction is set to be larger than a projected area of the opening.
Drainage system according to any one of claims 1 to 8. The drainage system is provided in a gutter of a bridge,
Drainage system according to any one of claims 1 to 9.

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