JP3741695B2 - Pipe fitting installation method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fitting method for a pipe joint provided with a guide channel for guiding fluid flowing out from a through hole provided in a lower peripheral wall of a fluid transport pipe upward along the outer peripheral surface of the fluid transport pipe.
[0002]
[Prior art]
When connecting a fire hydrant, air valve, etc. to a water pipe, which is an example of a fluid transport pipe, branch connection is made by deriving tap water flowing out from a through hole provided in the lower peripheral wall of the water pipe to a fire hydrant, air valve, etc. By using a fire hydrant, air valve, etc., soil and mud accumulated at the bottom of the water pipe due to piping work, etc. can be discharged together with tap water flowing out from the through hole, and the guide channel is connected to the water supply Since it is provided along the outer peripheral surface of the pipe, the flow path wall constituting the guide flow path can be provided integrally with the water pipe, and the guide flow path can be advantageously arranged in terms of strength.
However, in the conventional pipe joint mounting method, as shown in FIG. 7, the fluid flowing out from the through hole 02 provided in the lower peripheral wall of the fluid transport pipe 01 is supplied to the fluid transport pipe 01 itself used for a water pipe or the like. There is known a pipe joint 05 in which a guide flow path forming portion 03 that guides the fluid transport pipe 01 to the upper portion in the circumferential direction and a branch connection portion 04 are integrally cast. Connected in the middle of the piping path, a fire hydrant, an air valve, and the like are branched and connected to the branch connection portion 04 side (see, for example, Japanese Utility Model Laid-Open No. 5-19786).
[0003]
[Problems to be solved by the invention]
In the conventional pipe joint mounting method, since the pipe joint 05 in which the guide flow path and the branch connection portion are integrally formed is used for the fluid transport pipe itself, there is a disadvantage that the manufacturing cost increases.
In addition, when such a pipe joint 05 is newly provided in an existing piping path and a fire hydrant, an air valve, or the like is branched and connected, it is necessary to remove a part of the existing pipe and attach the pipe joint 05 to the removed portion. Therefore, there are disadvantages that require a lot of labor and cost for the branch connection work, and in such a branch connection work, the flow of fluid in the existing pipe is stopped or the fluid is removed from the existing pipe. Since it is necessary to attach a pipe joint, there is also a drawback that imposes inconvenience such as water outage on the user.
The present invention has been made in view of the above circumstances, and by devising a channel wall structure of a guide channel that guides the fluid transport pipe along the outer circumferential surface thereof in the circumferential direction, it is possible for the user to shut off water or the like. It is an object of the present invention to provide a pipe joint mounting method capable of efficiently and easily performing a branch connection work without inconvenience and advantageously in terms of construction cost.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention for achieving the above object, there is provided a characteristic structure of the pipe joint mounting method in which fluid flowing out from a through hole formed in the lower peripheral wall of the fluid transport pipe is allowed to flow along the outer peripheral surface of the fluid transport pipe. A pipe fitting with a guide channel that guides upward is attached to an existing fluid transport pipe,
A plurality of split forming members constituting a flow path forming member for forming a guide flow path between the outer periphery of the fluid transport pipe and the outer periphery of the fluid transport pipe are fixed in a state of being sandwiched from the radial direction. The fluid flowing out from the through hole formed in the lower peripheral wall of the fluid transport pipe flows to the branch connection provided in the upper split forming member between the inner surface of the flow path forming member and the outer peripheral surface of the fluid transport pipe. A step of forming a guide channel for guiding, and the inside of the guide channel is held liquid-tight or air-tight, and the cutter of the perforation device is fed from the upper peripheral wall of the fluid transport pipe to the lower peripheral wall side through the branch connection portion By this, it is in the point provided with the process of forming a through-hole in a concentric state in the upper peripheral wall and lower peripheral wall of a fluid transport pipe.
Further, the characteristic configuration of the pipe joint mounting method according to claim 2 of the present invention is that the plurality of divided forming members constituting the flow path forming member are one outer peripheral surface on the left and right sides of the outer peripheral surface of the fluid transport pipe. It is fixed in a state where the left and right other sides of the inner peripheral surface thereof are applied to the outer peripheral surface of the fluid transport pipe so as to form a guide flow channel between the portion and the inner surface of the flow channel forming member. is there.
[0005]
[Action]
In the pipe joint mounting method according to claim 1, the plurality of split forming members constituting the flow path forming member are fixed in a state of being sandwiched from the outer peripheral surface of the fluid transport pipe in the radial direction, thereby the inner surface of the flow path forming member. Guide channel for fluidly guiding the fluid flowing out from the through hole formed in the lower peripheral wall of the fluid transport pipe to the branch connecting portion provided in the upper split forming member between the outer peripheral surface of the fluid transport pipe Can be formed.
In addition, by using the branch connecting portion provided in the split forming member on the upper side, the through hole is concentrically formed in the upper peripheral wall and the lower peripheral wall by the cutter of the perforating apparatus fed from the branch connecting portion to the fluid transport pipe side. Since it can be formed, for example, the flow path forming member can be simplified and compact compared to a case where a drilling work connecting portion having a size that allows the cutter of the drilling device to pass through is provided on the lower divided forming member. In addition, it is not necessary to secure a large space for mounting the drilling device below the fluid transport pipe, so that the drilling volume of the work pit can be significantly reduced.
Furthermore, since the inside of the guide channel is kept liquid-tight or air-tight during the drilling process by the cutter of the punching device, the fluid that has flowed into the guide channel from the through hole does not leak outside, It is possible to efficiently connect the pipe joints in an uninterrupted state that does not stop fluid flow.
In the pipe joint mounting method according to claim 2, a guide channel for fluidly guiding the fluid flowing out from the through hole formed in the lower peripheral wall of the fluid transport pipe to the branch connection provided in the upper split forming member is provided. In forming the fluid transport pipe, an annular guide channel is not formed between the outer peripheral surface of the fluid transport pipe and the inner surface of the split forming member. Since a substantially semi-annular guide channel is formed between the inner surface of the path forming member, the left and right sides of the inner peripheral surface of the split forming member are secured while ensuring sufficient drainage performance of dirt, mud, etc. By fixing the lateral side against the outer peripheral surface of the fluid transport pipe, it is possible to secure a wide contact area between the flow path forming member and the outer peripheral surface of the fluid transport pipe and Relative movement can be effectively prevented.
[0006]
【The invention's effect】
The pipe joint installation method according to claim 1 does not require an operation of removing a part of an existing pipe, can greatly reduce the excavation volume of the work pit, and the assembly work of the pipe joint. Can be easily performed, and moreover, it is possible to efficiently and easily perform branch connection work without forcing inconvenience such as water outage to the user by synergistically preventing leakage of fluid during the drilling process. In addition, it can be carried out advantageously in terms of construction cost.
The pipe joint installation method according to claim 2 can firmly attach the flow path forming member and the outer peripheral surface of the fluid transport pipe while ensuring sufficient discharge performance of sediment, mud, etc. accumulated in the bottom of the pipe.
[0007]
【Example】
1 to 3 diverge into a through-hole 1 provided in a lower peripheral wall of an existing water pipe A through an arc-shaped guide channel 2 that guides the existing water pipe A along the outer peripheral surface thereof in the circumferential direction. A duct joint B made of ductile cast iron to be connected is shown, a flow path forming member 3 that can be fixed to the outer peripheral surface of the existing water pipe A is provided, and a branch connection portion 4 for branch connection of a fire hydrant, an air valve, etc. As shown in FIGS. 2 and 3, the inner surface of the flow path forming member 3 is fixed to the outer peripheral surface of the existing water pipe A as shown in FIGS. 2 and 3. The guide channel 2 is formed between the existing water pipe A and the outer peripheral surface of the existing water pipe A, and the tap water flowing out from the through hole 1 provided in the existing water pipe A is disposed along the outer peripheral surface of the existing water pipe A in the circumferential direction. And lead out to a fire hydrant or air valve that is branched and connected to the branch connection 4 side. A.
The flow path forming member 3 is formed in a cylindrical shape surrounding the outer peripheral surface of the existing water pipe A, and is divided into two upper and lower divided forming members 3a and 3b so as to be fixed in a state where the outer peripheral surface of the existing water pipe A is sandwiched from the radial direction. The flow path wall 12 forming the guide flow path 2 is bulged radially outward along the circumferential direction of the existing outer surface of the water pipe A.
The split forming members 3a and 3b include a groove 6 for mounting a rubber packing material 5 for preventing leakage of tap water from between the flow path forming member 3 and the outer peripheral surface of the existing water pipe A, and both split formations. The flanges 7 and 8 for connecting the members 3a and 3b and the mounting groove 10 for the rubber packing material 9 for preventing leakage of tap water from the joint surface between the flanges 7 are provided. A half cylinder that is pressed against the outer peripheral surface of the existing water pipe A so as to ensure a wide contact area between the outer peripheral surface of the water pipe A and the existing water pipe A so that the relative movement between the flow path forming member 3 and the existing water pipe A can be effectively prevented. The split member 3a on the upper side is provided with a branch connection pipe portion 4a and a connection flange 4b, and is the same as the upper peripheral wall and the lower peripheral wall of the existing water pipe A. Drilling to form the through holes 13, 1 in the core state Cutter E of device D branch connection portion 4 the size of which can pass is integrally formed.
Both split forming members 3a and 3b constituting the flow path forming member 3 are formed between the outer peripheral surface of the existing water pipe A and the outer peripheral surface portion on one side in the horizontal pipe diameter direction and the inner surface of the flow path forming member 3. The other side of the inner peripheral surface of the inner peripheral surface in the horizontal pipe diameter direction is fixed to the outer peripheral surface of the existing water pipe A so as to form a guide channel therebetween.
[0008]
The pipe joint B is attached to the existing water pipe A buried in the ground in an undisturbed state that does not stop the flow of tap water, and a fire hydrant, an air valve, etc. are provided on the branch connection portion 4 side of the pipe joint B. A branching method will be described with reference to FIGS. 4 (a) to (c) and FIGS. 5 (d) to (f).
After excavating a pit at a branch connection point such as a fire hydrant or an air valve to expose the existing water pipe A and cleaning the outer peripheral surface of the existing water pipe A, the divided forming members 3a and 3b fitted with the packing materials 5 and 9 are attached. 4 is set on the outer peripheral surface of the existing water pipe A, these packing materials 5 and 9 are connected together, and the flanges 7 and 8 of both split forming members 3a and 3b are connected with bolts and nuts. As shown in (a), the flow path forming member 3 is fixed in a watertight manner to the outer peripheral surface of the existing water pipe A, and between the inner surface of the flow path forming member 3 and the outer peripheral surface of the existing water pipe A, The branch connection pipe part of the branch connection part 4 is used to flow and guide the tap water flowing out from the through hole 1 formed in the lower peripheral wall of the existing water pipe A to the branch connection part 4 provided in the upper split forming member 3a. A guide channel 2 communicating with 4a is formed.
At this time, the two split forming members 3a and 3b constituting the flow path forming member 3 are the outer peripheral surface portion on one side of the horizontal pipe radial direction and the inner surface of the flow path forming member 3 among the outer peripheral surfaces of the existing water pipe A. Is fixed in a state where the other side in the horizontal pipe radial direction of the inner peripheral surface thereof is applied to the outer peripheral surface of the existing water pipe A so as to form a guide channel therebetween.
Next, the gate valve C is fixed to the branch connection part 4 in a watertight manner, and the first sealing case F in which the cylindrical cutter E of the punching machine D is set inside is fixed to the gate valve C in a watertight manner. As shown in FIG. 4B, the inside of the guide channel 2 is kept watertight.
Next, the cutter E of the perforator D is fed into the branch connection pipe portion 4a of the branch connection portion 4 through the gate valve C to form the working through hole 13 in the upper peripheral wall of the existing water pipe A, and then the cutter E Is inserted into the existing water pipe A through the working through hole 13 and further fed to the lower peripheral wall side of the existing water pipe A as shown in FIG. The through-hole 1 is formed in the lower peripheral wall of the existing water pipe A facing.
Next, as shown in FIG. 5 (d), the cutter E holding the cut pieces of the working through hole 13 and the through hole 1 inside is collected in the first sealed case F, and the gate valve C is closed. The first sealed case F is removed from the gate valve C, and as shown in FIG. 5 (e), the second sealed case G in which the closing member 14 for closing the working through hole 13 is set inside is divided into the gate valve. Fix water tightly against C.
[0009]
An operation rod 15 with a handle 16 that can be pushed and pulled and rotated from the outside of the case is supported on the second sealed case G, and is provided at the tip of the operation rod 15 as shown in FIG. The male screw portion 17 is screwed into a female screw hole 18 provided in the closing member 14, and the closing member 14 is set inside the case.
The closing member 14 is formed by covering a metal plate-shaped core material 19 with a thick rubber lining material 20 so as to have a disk shape in a plan view and an arc shape that follows the shape of the existing water pipe A in a side view. The upper and lower ridges 21 and 22 that sandwich the periphery of the working through-hole 13 from the thickness direction are integrally formed in an annular shape in a state that can be elastically deformed in the thickness direction. At the same time, a tapered surface 23 is formed on the lower surface side of the lower rod 22 so that the closing member 14 can be easily fitted into the working through hole 13.
[0010]
Then, when the taper surface 23 of the closing member 14 is pressed against the upper edge of the working through hole 13 and pushed by operating the operating rod 15, the lower rod 22 is elastically deformed as shown in FIG. The closing member 14 enters the working through-hole 13 and further pushes in the closing member 14 so that the upper collar 21 is elastically brought into contact with the upper edge of the working through-hole 13 as shown in FIG. When the push-in operation by the operating rod 15 is released after being deformed and inserted until the peripheral edge of the lower rod 22 comes out of the working through hole 13, as shown in FIG. 5 (f) or FIG. 6 (d) The peripheral edge of the work through hole 13 is sandwiched between the flanges 21 and 22, and the work through hole 13 is closed. In other words, the closing member 14 covers the inner peripheral surface of the through hole 13 formed in the upper peripheral wall of the fluid transport pipe (A).
Next, the operating rod 15 is rotated to be removed from the female screw hole 18 of the closing member 14 and collected in the second sealed case G. As shown in FIG. 2, the gate valve C is closed and the second sealed case G is removed. After that, a branch pipe or the like is connected to the gate valve C as necessary, and a fire hydrant, an air valve, or the like is connected to the branch connection portion 4 via the gate valve C.
The female screw hole 18 after the operation rod 15 is removed functions as an air vent hole after a fire hydrant, an air valve and the like are branched and connected.
[0011]
[Other Examples]
1. The fluid transport pipe to which the pipe joint according to the present invention is attached is not limited to a water pipe, but may be a sewage pipe, a gas pipe or the like, and the use of the attached fluid transport pipe is not particularly limited.
2. The flow path forming member of the pipe joint according to the present invention is fixed to the outer peripheral surface of the fluid transport pipe by welding, fixed by a bolt erected on the outer peripheral surface of the fluid transport pipe, or a U bolt attached to hold the outer peripheral surface of the fluid transport pipe It may be fixed by adhesive or adhesively fixed, and the fixing means is not limited.
3. The material of the pipe joint according to the present invention is not limited to metal, and may be synthetic resin, hard rubber, or the like.
4). The pipe joint according to the present invention is provided with a branch connection portion provided with a partition valve or the like that can hold a guide flow path formed between the flow path forming member and the outer peripheral surface of the existing fluid transport pipe in a liquid-tight or air-tight manner. It may be a thing.
5. In the pipe joint mounting method according to the present invention, a through-hole may be formed by inserting a perforating apparatus for perforating with an artificial operating force into the guide channel.
6). In the embodiment, the construction through-hole for forming the through-hole in the lower peripheral wall of the fluid transport pipe is formed with a large-diameter cutter, and after the construction through-hole is formed, the large-diameter cutter is replaced with a small-diameter cutter. Then, the small diameter cutter may be provided in the lower peripheral wall of the fluid transport pipe with a smaller diameter through hole than the construction through hole.
7). In the embodiment, even though the construction through-hole formed to provide the through-hole in the lower peripheral wall of the fluid transport pipe is left as it is, the construction is carried out by closing with a closing member (plug) that does not have a small hole that functions as an air vent hole. May be.
[0012]
It should be noted that reference numerals are used in the claims to make the comparison with the drawings convenient, but the present invention is not limited to the configuration of the attached drawings by the entry.
[Brief description of the drawings]
[Fig. 1] Exploded perspective view of a pipe joint [Fig. 2] Cross-sectional view of the pipe joint [Fig. 3] Side view of the pipe joint [Fig. 4] Schematic showing the pipe fitting installation method [Fig. 5] Pipe fitting installation method Fig. 6 is a cross-sectional view of the main part showing a pipe joint installation method. Fig. 7 is a perspective view showing a conventional pipe joint.
DESCRIPTION OF SYMBOLS 1 Through-hole 2 Guide flow path 3 Flow path formation member 4 Branch connection part A Fluid transport pipe B Pipe joint D Drilling apparatus

Claims (2)

A pipe provided with a guide channel (2) for guiding the fluid flowing out from the through hole (1) formed in the lower peripheral wall of the fluid transport pipe (A) upward along the outer peripheral surface of the fluid transport pipe (A). A method of attaching the joint (B) to the existing fluid transport pipe (A),
A plurality of split forming members (3a) and (3b) constituting a flow path forming member (3) for forming a guide flow path (2) between the outer peripheral surface of the fluid transport pipe (A) and a fluid The fluid transport pipe (A) is fixed between the outer peripheral surface of the transport pipe (A) and fixed between the inner surface of the flow path forming member (3) and the outer peripheral surface of the fluid transport pipe (A). The guide flow path (2) is formed to flow and guide the fluid flowing out from the through hole (1) formed in the lower peripheral wall to the branch connection portion (4) provided in the upper divided formation member (3a). And the step of the perforating device (D) from the upper peripheral wall of the fluid transport pipe (A) to the lower peripheral wall side through the branch connection (4) By feeding the cutter (E), the through hole (13), concentric with the upper peripheral wall and the lower peripheral wall of the fluid transport pipe (A), Mounting method of the pipe joint and a step of forming a 1). The plurality of split forming members (3a), (3b) constituting the flow path forming member (3) are the outer peripheral surface portion on the left and right sides of the outer peripheral surface of the fluid transport pipe (A) and the flow path forming member. (3) It is fixed in a state where the left and right other sides of the inner peripheral surface thereof are abutted against the outer peripheral surface of the fluid transport pipe (A) so as to form a guide channel with the inner surface of (3). 1 is a pipe joint installation method.

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