JPH09203107A - Installation method of temporary drain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely install a temporary drain to connect an inflow port of sewage to an outflow port with excellent workability under the condition where the sewage flows in/out. SOLUTION: A temporary drain pipe 7 to guide the sewage W from an inflow port 5 of an underwater merging cavity 1 to an outflow port 6, and a connection member to connect the temporary drain pipe 7 to the inflow port 5 are prepared, and after a connection member 8 is fitted to the inflow port 5, one end part 7a of the temporary drain pipe 7 is inserted in the outflow port 6 and the other end part 7b is connected to the connection member. The connection member integrates a pipe body 9 to be fitted to the temporary drain pipe 7 with a wall body 10 to cover a space between a base end part of the pipe body 9 and the inflow port inlet 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a temporary drainage channel in an operating underground confluence cavity (merging hall) where sewage flows in and out.

[0002]

2. Description of the Related Art Conventionally, when various works are performed in an operating underground confluence cavity where sewage flows in and out, temporary drainage of sewage flowing into the underground confluence cavity is performed until the end of the work. The temporary drainage method is to drain the sewage that has flowed into the underground confluence with an underwater pump, or connect the sewage inlet and outlet to the underground confluence with a temporary drainage channel, and from the inlet to the outlet. There is a method of directing sewage directly. However, provisional drainage with a submersible pump cannot cope with an increase in the amount of water during heavy rain, etc., and there is also a problem in terms of safety and economy. Often.

[0003]

However, the installation work of the temporary drainage channel in the operating underground confluence cavity where the sewage is flowing in and out is forced to perform underwater work, so that the safety and workability are poor. This invention solves the above-mentioned problems of the conventional technology, and under the situation where sewage flows into and out of the underground confluence cavity,
An object of the present invention is to provide a method for installing a temporary drainage channel that can safely and efficiently install a temporary drainage channel that connects an inlet and an outlet of sewage to an underground confluence cavity.

[0004]

In order to achieve the above object, the invention according to claim 1 provides a temporary drainage pipe for guiding sewage from an inlet of an underground confluence cavity to an outlet, and the temporary drainage pipe. A connection member for connecting to the inflow port is prepared, and after the connection member is attached to the inflow port, one end of the temporary drain pipe is inserted into the outflow port and the other end The end portion is connected to the connecting member.

According to the first aspect of the present invention, the temporary drainage pipe and the connecting member are prepared, the connecting member is attached to the inlet, and then one end of the temporary drainage pipe is inserted into the outlet. Since the other end is connected to the connecting member in the state, the temporary drainage channel can be installed safely and with good workability in a state where the sewage is flowing into the underground confluence cavity. Here, a corrugated pipe is mainly used as the temporary water pipe, but a synthetic resin pipe or a steel pipe can also be used.

The invention according to claim 2 is based on the invention according to claim 1, wherein the connecting member is a pipe body fitted to an end portion of the temporary drain pipe, a base end portion of the pipe body, and the pipe body. It is characterized in that it is formed integrally with a wall body that closes the space between the inflow port and the space.

According to the method of claim 2, after the connecting member is attached to the inflow port, one end of the temporary drain pipe is inserted into the outflow port while the other end of the temporary drain pipe is inserted into the outflow port. By fitting and connecting the pipe of the connecting member,
With the sewage flowing into the underground confluence, the temporary drainage can be installed more safely and with good workability. Here, it is desirable that the pipe body of the connection member is formed so that it can be inserted into the end portion of the temporary drain pipe.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view schematically showing the structure of an underground confluence cavity. Sewage constantly flows into the underground confluence cavity 1 from an inflow pipe 2 and flows to an outflow pipe 3. When various operations are performed in the underground confluence cavity 1 in operation, a temporary drainage channel connecting the inflow port 5 and the outflow port 6 of the sewage is provided so that the sewage does not flow into the underground confluence cavity 1. As various operations in the underground confluence cavity 1, a shield excavator reaches the underground confluence cavity 1 to create a new flow path (new shield).
After forming 4, the secondary lining work of the new channel 4 and the invert construction work of the underground confluence cavity 1 are performed.

A series of work steps for installing a temporary drainage channel in the underground confluence 1 by the method according to the present invention will be described below with reference to FIGS.

In the method for installing the temporary drainage channel according to the present invention,
When performing work in the underground confluence cavity 1, a temporary drain pipe 7 for guiding sewage from the inflow port 5 to the outflow port 6, and a temporary drain pipe 7
And a connecting member 8 for connecting the inflow port 5 with the inflow port 5 are prepared in advance.

As the temporary drainage pipe 7, a corrugated pipe having a smaller diameter than the inflow port 5 is used. The connection member 8 is a temporary drain pipe 7.
And a metal wall body (upstream water stop wall) 10 attached to the position of the inflow port 5 on the inner surface of the underground confluence cavity 1. Wall 10
Is curved according to the curvature of the inner surface of the underground confluence cavity 1, and a temporary inflow port 10a is formed slightly below the central portion thereof. The tubular body 9 is welded over the entire periphery of the temporary inflow port 10a and is completely fixed to the wall body 10. The temporary drainage pipe 7 and the connecting member 8 are transported to the work site after being created in a separate factory.

In the field, first, as shown in FIG.
A connecting member 8 is attached to the inflow port 5 of the underground confluence cavity 1.
A pedestal 11 for the temporary drainage pipe 7 is installed below the outflow pipe 3. The connection member 8 is aligned so that there is no step between the bottom surface of the pipe body 9 and the bottom surface of the inflow pipe 2, and is fixed to the inner wall of the underground confluence cavity 1 by an anchor bolt or the like. An H-shaped steel material or the like is used for the pedestal 11, which is horizontally installed in the chord direction of the outflow pipe 3.

Next, as shown in FIG. 3, the temporary water distribution pipe 7 is suspended in the underground confluence cavity 1 with the wire rope 12, and one end 7a of the temporary water distribution pipe 7 is inserted into the outflow pipe 3. Also,
A sandbag 13 for backflow prevention is placed on the bottom of the outflow pipe 3.

Then, as shown in FIG. 4, one end 7a of the temporary water pipe 7 is inserted into the outflow pipe 3, and the other end 7b of the temporary water pipe 7 is connected to the pipe of the connecting member 8. It is fitted to the outside of the body 9, and the outflow pipe 3 side of the temporary water pipe 7 is supported by the pedestal 11. When this step is completed, most of the sewage W from the inflow pipe 2 is led to the outflow pipe 3 through the temporary water distribution pipe 7.

After that, from the temporary water pipe 7 to the wire rope 1
2 is removed, and as shown in FIG. 5, a downstream water blocking wall 14 that blocks between the temporary water distribution pipe 7 and the outflow port 6 (the inlet of the outflow pipe 3) is constructed, and the temporary water distribution pipe 7 and the connecting member are connected. The caulking material 15 is filled in the gap between the tubular body 8 and the tubular body 9.

As shown in FIG. 6, a temporary drainage channel 17 connecting the inflow port 5 and the outflow port 6 of the sewage is formed in the underground confluence cavity 1 by the above series of operations.

According to the method of installing the temporary drainage channel shown in the above-mentioned embodiment, the temporary drainage pipe 7 and the connecting member 8 are prepared and prepared in advance in the factory, and the connecting member 8 is used as the inlet at the site. 5, the one end 7a of the temporary drainage pipe 7 was inserted into the outflow port 6 and the other end 7b was connected to the connecting member 8. Even when W is flowing in, the temporary drainage channel 17 can be installed safely and with good workability with a minimum amount of underwater work.

In the above example, a corrugated pipe is used as the temporary drain pipe 7, and the caulking material 15 is used to seal between the pipe body 9 of the connecting member 8 and the corrugated pipe. As the steel pipe, a watertightness may be maintained by welding the end portion 7b of the steel pipe and the outer peripheral portion of the pipe body 9 over the entire circumference. Further, the temporary drainage pipe 7 and the pipe body 9 of the connection member 8 may be arranged to be joined to each other, and the joint portion of both may be welded over the entire circumference.

[0020]

According to the method of the first aspect, the temporary drainage pipe and the connecting member are prepared, the connecting member is attached to the inlet, and then one end of the temporary drainage pipe is inserted into the outlet. In this state, the other end is connected to the connecting member, so even if sewage is flowing into the underground confluence cavity,
A temporary drainage channel can be installed safely and with good workability with a minimum of underwater work.

According to the second aspect of the present invention, one end of the temporary drainage pipe is inserted into the outflow port, and the other end of the provisional drainage pipe is fitted and connected to the pipe body of the connecting member. It is possible to install a temporary drainage channel more safely and with good workability in a state where sewage is flowing into the underground confluence cavity.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing the structure of an underground confluence cavity.

FIG. 2 is a process chart for explaining the contents of work in the embodiment of the method for installing the temporary drainage channel of the present invention.

FIG. 3 is a process diagram for explaining the content of a work performed following the process of FIG.

FIG. 4 is a process diagram for explaining the content of work performed following the process of FIG.

FIG. 5 is a process diagram for explaining the content of work performed following the process of FIG.

FIG. 6 is a plan view schematically showing the structure of an underground confluence cavity in which a temporary drainage channel is installed by the method according to the present invention.

[Explanation of symbols]

 1 Underground confluence 2 Inflow pipe 3 Outflow pipe (water discharge pipe) 4 New flow path 5 Inlet 6 Outlet 7 Temporary drainage pipe 7a End part 7b End part 8 Connection member 9 Tube 10 Wall body 11 Cradle 12 Wire rope W sewage

Claims (2)

[Claims] 1. A method of installing a temporary drainage channel connecting an inflow port and an outflow port of a sewage in an underground confluent cavity where sewage flows in and out, for guiding the sewage from the inflow port to the outflow port. Of the temporary drainage pipe and a connecting member for connecting the temporary drainage pipe and the inlet, and after attaching the connecting member to the inlet, one end of the temporary drainage pipe is A method for installing a temporary drainage channel, characterized in that the other end is connected to the connecting member in a state of being inserted into the outflow port. 2. The connecting member is integrally formed with a pipe body fitted with an end portion of the temporary drain pipe and a wall body closing the base end portion of the pipe body and the inflow port. The method for installing the temporary drainage channel according to claim 1, wherein the temporary drainage channel is installed.