JP2014201912A - Transfer method of pipe conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer method of a pipe conduit capable of transferring the pipe conduit in non-cutoff water by easy and safe work.SOLUTION: The transfer method of the pipe conduit is provided for replacing a part of a buried existing culvert 1 with a new culvert 6, and executes (1) a process of drilling a foundation so that the existing culvert 1 is respectively exposed to the upstream side and the downstream side of a replacement object part of the existing culvert 1, (2) a process of communicating an upstream switching chamber 4 and a downstream switching chamber 5 by the new culvert 6 to be newly buried by respectively forming the upstream switching chamber 4 and the downstream switching chamber 5 by building skeletons 2 and 3 in respective drilling parts on the upstream side and the downstream side and (3) a process of conducting water to the new culvert 6 by blocking up cutting ports 11 and 12 of an existing culvert residual part 1A by water cutoff plates 7 and 8 by cutting the existing culvert 1 in the upstream switching chamber 4 and the downstream switching chamber 5, in respective orders.

Description

  The present invention relates to a pipeline relocation method.

  When a part of the sewer pipe is old and water leaks, etc., as a method to deal with this, the front and back of the old part is cut and a new pipe is inserted into the cut part and connected by welding etc. The method comes to mind. However, in this method, the sewage must be stopped on the upstream side, which causes a disadvantage that the sewage cannot flow downstream during the operation. Therefore, in actuality, the pipe rod itself is hardly replaced, and the actual situation is that only the repair work such as a first-aid treatment such as closing the hole of the water leakage portion is performed. In addition, when there is a building or the like above the old part, there are many situations where the ground cannot be dug up and left as it is.

  In addition, for the purpose of stopping the water flow as needed or adjusting the flow rate, it is conceivable to newly install a water control door on the pipe rod. As this technique, there is a continuous water installation method described in Patent Document 1. It is done. The construction method consists of (1) excavating the ground in which the channel pipe is embedded and exposing the channel pipe, and (2) making the channel pipe in a concave shape with the channel pipe exposed in the excavated ground. Placing and curing concrete to form a gate drive, (3) cutting the flow channel pipe in the gate drive and forming a flow path through the gate drive, (4) the gate drive The process of fixing the door frame to the body and attaching the water control door to the door frame, or fixing the door frame to which the water control door is previously attached to the gate body is performed in that order. It is. According to this construction method, the water control door can be installed without interrupting the flow of water, that is, water can always flow downstream during construction.

JP-A-9-209339

  However, since the technique described in Patent Document 1 uses the space of the gate chamber formed of the gate driver as a part of the flow path, the gate chamber is always filled with water. Accordingly, when a water control door is newly installed, inspected, or replaced, an operator enters the water and performs work, which requires laborious work.

  The present invention was created to solve the above-described problems, and it is possible to transfer the pipe line with continuous water with easy and safe work. The purpose is to provide a method for moving pipes that can be installed without underwater work and does not require underwater work even when checking or replacing the water control door.

  In order to solve the above-mentioned problems, the present invention provides a method for moving a pipe line in which a part of an existing channel pipe buried therein is replaced with a new channel pipe, and (1) Step of excavating the ground so that the existing channel pipes are exposed on the upstream side and downstream side, respectively. (2) Building a frame in each of the upstream and downstream excavation sections to form an upstream switching chamber and a downstream switching chamber, respectively. And a step of communicating the upstream switching chamber and the downstream switching chamber with a newly embedded new channel pipe, (3) cutting the existing channel pipe in the upstream switching chamber and the downstream switching chamber, and replacing the existing channel pipe The step of closing the cut-off port of the part and passing the water through the new flow path pipe is performed in that order.

According to this transfer method of the pipeline, the upstream switching chamber and the downstream switching chamber are communicated with each other by a new channel pipe, and then the existing channel pipe is cut in the upstream switching chamber and the downstream switching chamber. The existing channel pipe is immediately switched to the new channel pipe. As a result, it is possible to relocate the pipeline with unrestricted water in an easy and safe operation.
Even if there is a building or the like above the replacement part of the existing channel pipe, select a place where there are no obstacles on the ground and arrange the upstream switching room, downstream switching room, and new channel pipe Thus, the present invention can be easily implemented.

  According to the present invention, in the step (2), the upstream switching chamber and the downstream switching chamber are communicated with each other by a plurality of new flow channel pipes including at least a first new flow channel tube and a second new flow channel tube. Features.

  According to this pipe transfer method, for example, when exchanging a new channel pipe at a later time, water is passed through any one of the new channel pipes, that is, the new channel pipe is replaced with uninterrupted water. Can do.

  Further, according to the present invention, in the step (2), a water control door is installed in each of the first branch channel passing through the first new channel tube and the second branch channel passing through the second new channel tube. It is characterized by that.

  According to this pipe relocation method, it is possible to install a water control door without the need for troublesome underwater work. Since there are multiple flow paths in the gate chamber and water control doors are installed for each, the remaining water control doors should be able to pass water even if one of the water control doors fails. Can be passed through.

  Further, according to the present invention, when the water control door of one of the first branch flow path and the second branch flow path is inspected or replaced after the step (3), the water control in the one branch flow path is performed. A temporary water stop member is installed on the upstream side and the downstream side of the door, and the water control door is inspected or replaced in a water stop state, while the other diversion channel is allowed to pass through.

  According to this method of moving the pipe, the water control door can be inspected or replaced without requiring time-consuming underwater work, even when the water control door is inspected or replaced.

According to the present invention, it is possible to relocate a pipeline with unrestricted water by an easy and safe operation.
Moreover, even if there is a building or the like in the above-ground part above the replacement target part of the existing channel pipe, it can be implemented.

It is a plane sectional view showing a 1st embodiment of the present invention. It is AA sectional drawing in Fig.1 (a). It is a plane sectional view showing a 2nd embodiment of the present invention, and shows the state where an upper switching room and a downstream switching room were formed. It is a plane sectional view showing a 2nd embodiment of the present invention, and shows the state where an existing pipe rod was cut. It is a plane sectional view showing a 2nd embodiment of the present invention, and shows the state where the cutting mouth of the existing pipe rod remainder part was plugged up. It is a plane sectional view showing a 3rd embodiment of the present invention, and shows the state where an upper switching room and a downstream switching room were formed. It is a plane sectional view showing a 3rd embodiment of the present invention, and shows the state where a water control door was installed. It is a plane sectional view showing a 3rd embodiment of the present invention, and shows the state where an existing pipe rod was cut. It is a plane sectional view showing a 3rd embodiment of the present invention, and shows the state where the cutting mouth of the existing pipe rod remainder part was plugged up. It is an external appearance perspective view which shows an example of a water control door.

“First Embodiment”
FIG. 2 is a cross-sectional view taken along line AA in FIG. The code | symbol G shows the ground surface and the existing pipe rod (existing channel pipe 1 as described in a claim) is embed | buried under the ground. Hereinafter, for example, a case where an aging part is found in the middle of the pipe 1 as shown in FIG. 1A and a pipe line around the aging part is transferred will be described.

“(1) Step of excavating the ground so that the existing pipe rod 1 is exposed on the upstream side and the downstream side of the replacement target portion of the existing pipe rod 1”
First, the ground is excavated so that the existing pipe rod 1 is exposed around the old part of the existing pipe rod 1, that is, upstream and downstream of the replacement target portion.

“(2) The upper and lower switching chambers 4 and 5 are formed by constructing the casings 2 and 3 in the upstream and downstream excavation sections, respectively, and the upstream switching chamber 4 and the new switching rod 6 are newly embedded. Step of communicating with the downstream switching chamber 5 "
As shown in FIG. 1A and FIG. 2, concrete is cast and cured at each of the upstream and downstream excavation parts to build the frames 2 and 3. The casings 2 and 3 are formed, for example, as a substantially rectangular casing. The interior of the housing 2 is configured as an upstream switching chamber 4, and the interior of the housing 3 is configured as a downstream switching chamber 5. The existing pipe 1 is positioned so as to penetrate the upstream switching chamber 4 and the downstream switching chamber 5. In addition to the excavation for building the frames 2 and 3, excavation for embedding a new pipe rod (new channel pipe according to the claims) 6 is also performed, and the new pipe rod 6 is embedded in the excavation part, The upstream switching chamber 4 and the downstream switching chamber 5 are communicated with each other by the new pipe 6.

  As a work mode, the new pipe rod 6 is first lowered and positioned in the excavation section, and the casing 2 is arranged so that the upstream port and the downstream port of the new pipe rod 6 face the upstream switching chamber 4 and the downstream switching chamber 5, respectively. , 3 is a simple work. However, in some cases, after the construction of the housings 2 and 3 is completed, the new pipe rod 6 is lowered and the upstream switching chamber 4 and the downstream switching chamber 5 communicate with each other. Further, in FIG. 1A, the new tube 6 is arranged in parallel with the existing tube 1; however, the layout of the new tube 6 is not limited to this. Further, a curved pipe may be used as the new pipe rod 6.

  In addition, water stop plate mounting grooves 9 and 10 for fitting the water stop plates 7 and 8 (FIG. 1C) in the subsequent process are formed in the casings 2 and 3.

“(3) Cutting the existing pipe rod 1 in the upstream switching chamber 4 and the downstream switching chamber 5, closing the cut ports 11 and 12 of the replacement target portion of the existing pipe rod 1, and allowing the new pipe rod 6 to flow”
Next, as shown in FIG. 1 (b), the existing pipe rod 1 is cut in each of the upstream switching chamber 4 and the downstream switching chamber 5. Next, as shown in FIG. 1 (c), in the upstream switching chamber 4, by inserting the water stop plate 7 into the water stop plate mounting groove 9 and pouring the concrete 13 or the like, the replacement target portion of the existing pipe 1 (existing) The cutting opening 11 of the tube tub remaining part 1A) is closed. Similarly, in the downstream switching chamber 5, the water stop plate 8 is inserted into the water stop plate mounting groove 10 and concrete 13 or the like is poured into the cut end 12 of the existing pipe rod remaining portion 1 </ b> A.

  As described above, the sewage flowing out from the upstream cut port 14 of the existing pipe rod 1 into the upstream switching chamber 4 flows into the downstream switch chamber 5 through the new pipe rod 6 and flows into the downstream cut port 15 of the existing pipe rod 1 again. In addition, although it is fundamental to leave the existing pipe residue 1A as it is, it may be removed depending on circumstances.

According to the present invention, the upstream switching chamber 4 and the downstream switching chamber 5 are communicated with each other by the new pipe rod 6, and then the existing pipe rod 1 is cut in the upstream switching chamber 4 and the downstream switching chamber 5 to leave the existing pipe rod remaining portion 1A. By closing the pipe, the pipe line can be immediately switched from the existing pipe pipe 1 to the new pipe pipe 6, and the pipe can be relocated with unrestricted water with an easy and safe operation.
Even if there is a building or the like above the replacement part of the existing pipe 1, the upstream switching room 4, the downstream switching room 5, and the new pipe 6 are selected by selecting a place where there are no obstacles on the ground. By doing so, the present invention can be easily implemented.

“Second Embodiment”
3 to 5 are explanatory views according to the second embodiment. Whereas the first embodiment is a form in which one new tube rod 6 is arranged, the second embodiment is a plurality of new tube rods composed of at least a first new tube rod 16 and a second new tube rod 17. It is the form which arranged. In addition, the same code | symbol is attached | subjected about the same component as 1st Embodiment.

“(1) Step of excavating the ground so that the existing pipe rod 1 is exposed on the upstream side and the downstream side of the replacement target portion of the existing pipe rod 1”
First, the ground is excavated so that the existing pipe rod 1 is exposed around the old part of the existing pipe rod 1, that is, upstream and downstream of the replacement target portion.

“(2) The first and second new pipes 16 and 2 are newly built by constructing the casings 2 and 3 in the upstream and downstream excavation sections to form the upstream switching chamber 4 and the downstream switching chamber 5 respectively. The step of communicating the upstream switching chamber 4 and the downstream switching chamber 5 with the pipe rod 17 "
As shown in FIG. 3, concrete is placed and cured on each of the upstream and downstream excavation parts to build the frames 2 and 3. The casings 2 and 3 are formed, for example, as a substantially rectangular casing. The interior of the housing 2 is configured as an upstream switching chamber 4, and the interior of the housing 3 is configured as a downstream switching chamber 5. The existing pipe 1 is positioned so as to penetrate the upstream switching chamber 4 and the downstream switching chamber 5. In addition to the excavation for constructing the frames 2 and 3, excavation for embedding the first new pipe 16 and the second new pipe 17 is also performed, and the first new pipe 16 and the second new pipe are installed in the excavation part. A pipe rod 17 is buried, and the upstream switching chamber 4 and the downstream switching chamber 5 are communicated with each other by the first new pipe rod 16 and the second new tube rod 17.

  In the present embodiment, the first relay chamber 20 formed by the casing 18 is provided in the middle of the first new pipe rod 16, and the second relay chamber formed by the casing 19 in the middle of the second new pipe rod 17. 21 is provided. Both the frames 18 and 19 are formed by placing and curing concrete. The upstream switching chamber 4 and the first relay chamber 20 communicate with each other via a new upstream pipe 16A, and the first relay chamber 20 and the downstream switching chamber 5 communicate with each other via a new downstream pipe 16B. The upstream switching chamber 4 and the second relay chamber 21 communicate with each other by an upstream new pipe rod 17A, and the second relay chamber 21 and the downstream switching chamber 5 communicate with each other by a downstream new tube rod 17B. Temporary water stop plate mounting grooves 22 and 23 for fitting the temporary water stop plate 28 (FIG. 5) in the subsequent steps are formed in the casings 18 and 19.

“(3) In the upstream switching chamber 4 and the downstream switching chamber 5, the existing pipe rod 1 is cut, the cut ports 11 and 12 of the replacement target portion of the existing pipe rod 1 are closed, and the first new pipe rod 16 and the second new pipe rod 16 The process of passing water through the tube 17 "
Next, as shown in FIG. 4, the existing pipe rod 1 is cut in each of the upstream switching chamber 4 and the downstream switching chamber 5. Next, as shown in FIG. 5, in the upstream switching chamber 4, the water stop plate 24 is inserted into the water stop plate attachment groove 9 and concrete 26 or the like is poured to close the cut port 11 of the existing pipe rod remaining portion 1 </ b> A. Similarly, in the downstream switching chamber 5, the water stop plate 25 is inserted into the water stop plate mounting groove 10 and concrete 26 or the like is poured into the cut end 12 of the existing pipe rod remaining portion 1 </ b> A.

  As described above, the sewage that has flowed out from the upstream cut port 14 of the existing pipe 1 into the upstream switching chamber 4 is second through the first branch pipe 27A and the second new pipe 17 via the first new pipe 16. It flows into the downstream switching chamber 5 through the branch flow path 27B, and again flows into the downstream cutting port 15 of the existing pipe rod 1. Then, the temporary water stop plate 28 is fitted into one of the temporary water stop plate mounting grooves 22 and 23 as necessary, so that the pipe line is set to only one of the first branch flow path 27A and the second branch flow path 27B. be able to.

  According to the transfer method of the pipe line of the second embodiment, for example, when the first new pipe pipe 16 and the second new pipe pipe 17 are replaced later, water is passed using one new pipe rod, that is, New pipes can be replaced with constant water. Note that the number of new pipes is not limited to two, but three or more can be provided.

“Third Embodiment”
6 to 9 are explanatory views according to the third embodiment. In the third embodiment, a plurality of new pipe rods including at least a first new pipe rod 34 and a second new pipe rod 35 are arranged, and water control doors 51 and 52 are provided. In addition, the same code | symbol is attached | subjected about the same component as 1st Embodiment.

“(1) Step of excavating the ground so that the existing pipe rod 1 is exposed on the upstream side and the downstream side of the replacement target portion of the existing pipe rod 1”
First, the ground is excavated so that the existing pipe rod 1 is exposed around the old part of the existing pipe rod 1, that is, upstream and downstream of the replacement target portion.

“(2) The first and second new pipe rods 34 and 2 are newly constructed by constructing the casings 2 and 3 in the upstream and downstream excavation sections to form the upstream switching chamber 4 and the downstream switching chamber 5 respectively. The upstream switching chamber 4 and the downstream switching chamber 5 are communicated with each other by the pipe rod 35, and the first branch channel 53A passing through the first new pipe rod 34 and the second branch channel 53B passing through the second new pipe rod 35 are respectively controlled. Process of installing water doors 51 and 52 "
As shown in FIG. 6, concrete is placed and cured on each of the upstream and downstream excavation parts to build the frames 2 and 3. The casings 2 and 3 are formed, for example, as a substantially rectangular casing. The interior of the housing 2 is configured as an upstream switching chamber 4, and the interior of the housing 3 is configured as a downstream switching chamber 5. The existing pipe 1 is positioned so as to penetrate the upstream switching chamber 4 and the downstream switching chamber 5. In addition to the excavation for constructing the frames 2 and 3, excavation for burying the first new pipe 34 and the second new pipe 35 is also performed, and the first new pipe 34 and the second new A pipe rod 35 is buried, and the upstream switching chamber 4 and the downstream switching chamber 5 are communicated by the first new pipe rod 34 and the second new pipe rod 35.

  In the present embodiment, a first relay chamber 40 formed by a housing 36 and a second relay chamber 41 formed by a housing 37 are provided in the middle of the first new tube rod 34, and a middle of the second new tube rod 35 is provided. In addition, a third relay chamber 42 formed by the housing 38 and a fourth relay chamber 43 formed by the housing 39 are provided. Each of the frames 36 to 39 is formed by placing and curing concrete. The upstream switching chamber 4 and the first relay chamber 40 communicate with each other via an upstream new pipe rod 34A, and the first relay chamber 40 and the second relay chamber 41 communicate with each other via a midstream new pipe rod 34B. The downstream switching chamber 5 communicates with a new downstream pipe 34C. The upstream switching chamber 4 and the third relay chamber 42 communicate with each other via an upstream new pipe rod 35A, and the third relay chamber 42 and the fourth relay chamber 43 communicate with each other through a midstream new pipe rod 35B. The downstream switching chamber 5 communicates with a new downstream pipe 35C. Temporary water stop plate mounting grooves 44 to 47 for fitting temporary water stop plates 57 and 58 (FIG. 9) are formed in the casings 36 to 39 in a later step.

  Next, as shown in FIG. 7, the water control door 51 is installed in the housing 36 in the first relay chamber 40, and the water control door 52 is installed in the housing 38 in the third relay chamber 42. As the water control doors 51 and 52, for example, as shown in FIG. 10, a door frame 30 having a rectangular frame shape and a door body 31 that is guided by the door frame 30 and opens and closes up and down are provided. It is a water control door having a known structure that adjusts the flow rate according to the degree of opening and closing 31. An opening / closing drive rod 32 is attached to the upper portion of the door body 31 upward, and the upper portion of the opening / closing drive rod 32 is connected to an opening / closing machine 33 having a drive source such as a motor. The door-to-door frame 30 is attached to the inner surfaces of the housings 36 and 38 in FIG.

  In addition, the water control door 51 is not restricted to the form installed in the 1st relay chamber 40, It is also possible to install in the upstream switching chamber 4, the 2nd relay chamber 41, and the downstream switching chamber 5, and a water control door is also possible. 52 is not limited to the form installed in the third relay chamber 42, and can be installed in the upstream switching chamber 4, the fourth relay chamber 43, and the downstream switching chamber 5.

  At the stage of installing the water control doors 51 and 52, the existing pipe 1 has not been cut yet, so that sewage does not flow into the first relay chamber 40 and the third relay chamber 42. Therefore, the operator can install the water control doors 51 and 52 without requiring time-consuming underwater work. Moreover, in installing the water control doors 51 and 52, the door body 31 can be installed with the door body 31 closed with respect to the door-to-door frame 30, that is, the door body 31 can be installed in the fully closed state at the time of factory shipment. . Therefore, the accuracy of installation of the water control doors 51 and 52 can be improved while maintaining the water stop performance at the time of shipment from the factory, and the gap (clearance) between the door stop frame 30 and the door body 31 can be made uniform. .

“(3) In the upstream switching chamber 4 and the downstream switching chamber 5, the existing pipe rod 1 is cut, the cutting ports 11 and 12 of the replacement target portion of the existing pipe rod 1 are closed, and the first new pipe rod 34 and the second new pipe rod 34. The process of passing water through the pipe 35 "
Next, as shown in FIG. 8, the existing pipe rod 1 is cut in each of the upstream switching chamber 4 and the downstream switching chamber 5. Next, as shown in FIG. 9, in the upstream switching chamber 4, the water stop plate 54 is inserted into the water stop plate attachment groove 9 and concrete 56 or the like is poured to close the cut port 11 of the existing pipe rod remaining portion 1 </ b> A. Similarly, in the downstream switching chamber 5, the water stop plate 55 is inserted into the water stop plate mounting groove 10 and concrete 56 or the like is poured into the cut end 12 of the existing pipe remnant 1 </ b> A.

  As described above, the sewage that has flowed into the upstream switching chamber 4 from the upstream side cutting opening 14 of the existing pipe 1 is the second branch 53 A that passes through the first new pipe 34 and the second new pipe 35. It flows into the downstream switching chamber 5 through the branch flow path 53B, and flows again into the downstream cutting port 15 of the existing pipe rod 1.

  As described above, according to the construction method of the third embodiment, it is possible to install the water control doors 51 and 52 without requiring a troublesome underwater operation. Since the water control doors 51 and 52 are respectively installed in the first branch flow path 53A and the second branch flow path 53B, it is a case where one of the water control doors 51 and 52 is troubled so that water cannot pass therethrough. However, water can be passed through the other water control door.

  Further, after the step (3), as shown in FIG. 9, when checking or replacing the water control door 52 of a certain diversion channel (second diversion channel 53B), the water control door in the second diversion channel 53B is used. Temporary water stop plates 57 and 58 as temporary water stop members are fitted into the water stop plate mounting grooves 46 and 47 on the upstream side and the downstream side of the water 52 so that the second branch passage 53B is in a water stop state and the water control door 52 is inserted. Check or replace. After the temporary water stop plates 57 and 58 are installed, the water accumulated between the temporary water stop plates 57 and 58 in the second branch channel 53B is drained by, for example, a drain pump. Meanwhile, in the first diversion channel 53A, the water control door 51 is opened and water is allowed to pass therethrough. That is, the water control door 52 can be easily inspected or replaced with unrestricted water while flowing water downstream of the existing pipe 1. Conversely, when inspecting or replacing the water control door 51 of the first diversion channel 53A, the temporary water stop plates 57 and 58 are dropped into the upstream and downstream sides of the water control door 51 in the first diversion channel 53A. The water control door 51 is inspected or replaced with the one-minute flow path 53A in the water stop state. Meanwhile, in the second branch channel 53B, the water control door 52 is opened and water is allowed to flow therethrough.

  As described above, according to the present invention, the water control doors 51 and 52 can be inspected or replaced without requiring time-consuming underwater work even when the water control doors 51 and 52 are inspected or replaced. The temporary water stop member is not limited to the temporary water stop plates 57 and 58, and sandbags may be used.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to those described in the drawings, and various design changes can be made without departing from the spirit of the present invention.

1 Existing pipe rod (Existing flow pipe)
1A Existing pipe residue 2,3 Frame 4 Upstream switching chamber 5 Downstream switching chamber 6 New tube (new channel tube)
7, 8 Water stop plate 14 Upstream side cut port 15 Downstream side cut port 16, 17 New pipe rod (new channel pipe)
18 First relay chamber 19 Second relay chamber 28 Temporary water stop plates 34, 35 New pipe (new flow pipe)
40 First relay chamber 41 Second relay chamber 42 Third relay chamber 43 Fourth relay chamber 51, 52 Water control door 53A First branch channel 53B Second branch channel 57, 58 Temporary water stop plate

Claims (4)

It is a transfer method of a pipeline that replaces a part of an existing channel pipe buried in a new channel pipe,
(1) a step of excavating the ground so that the existing channel pipes are exposed on the upstream side and the downstream side of the replacement target part of the existing channel pipes,
(2) An upstream switching chamber and a downstream switching chamber are formed in each of the upstream and downstream excavation sections to form an upstream switching chamber and a downstream switching chamber, respectively, and the upstream switching chamber and the downstream switching chamber are communicated with each other by a new channel pipe. Process,
(3) cutting the existing channel pipe in the upstream switching chamber and the downstream switching chamber, closing the cutting port of the replacement target part of the existing channel pipe, and allowing water to flow through the new channel pipe;
A method for moving pipes, characterized in that they are performed in that order.   The step (2) is characterized in that the upstream switching chamber and the downstream switching chamber are communicated with each other by a plurality of new channel pipes including at least a first new channel pipe and a second new channel pipe. 1. The method for moving pipes as described in 1.   In the step (2), a water control door is installed in each of the first branch channel passing through the first new channel pipe and the second branch channel passing through the second new channel pipe. The pipe relocation method according to claim 2. After the step (3), inspecting or exchanging the water control door of one of the first branch channel and the second branch channel,
Install temporary water stop members on the upstream and downstream sides of the water control door in the one diversion channel, and check or replace the water control door in the water stop state, while letting the other diversion channel pass through. The pipe relocation method according to claim 3, wherein the pipe is moved.

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