JPS5939040B2 - Underground pipe closure method - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method for blocking underground pipes, and its purpose is to eliminate the need for manual labor underground, which is associated with risks such as oxygen deficiency accidents and cave-in accidents, and to save labor through mechanization. To provide a construction method for closing underground pipes which is possible and does not damage other buried pipes installed in parallel.

In general, when water, sewer, and gas pipes become obsolete after being buried for many years, there is a risk of water leakage, gas leakage, etc.; There is a risk of water leakage, and if the buried gas pipes become obsolete, there is a risk of gas leakage and even a gas explosion.

However, since these underground pipes are usually buried under city roads, they have the disadvantage of requiring a partial or complete suspension of traffic in order to replace them. It was necessary to expose the parallel pipes and confirm their positions while replacing the water supply pipes.

If the position of the parallel pipes is not confirmed, the parallel buried pipes such as gas pipes may be damaged during water pipe replacement work, resulting in gas or water leakage into the subway premises or a gas explosion due to gas leakage. There was a risk of causing a major disaster such as the next disaster.

Therefore, it is possible to consider a method of burying a new buried pipe instead of replacing the old buried pipe and leaving the old pipe as a pipe, but depending on this proposed construction method, the old pipe will remain empty in the soil. If left untreated for a long period of time, it would cause problems such as road collapse, so this method was not a drastic improvement.

Furthermore, as an improvement to the above-mentioned trial construction method, an improved construction method has been proposed in which the hollow space inside the old pipe is buried with earth and sand by underground work, but manual work underground is currently not the preferred method due to the frequent occurrence of oxygen deficiency accidents. I had one great power.

In view of these circumstances, the inventors continued their intensive research into a labor-saving construction method that does not require manual labor in the ground and minimizes the negative impact on urban transportation.
The inventors have completed this inventive construction method by using the air suction mechanism that they have invented and already disclosed.

In other words, the present invention relates to a buried pipe for gas, sewerage, water supply, etc., which is buried in the ground under roads in urban areas, etc., and which requires blocking. The starting end of this buried pipe is exposed to the surface and then airtightly sealed, while the other end is equipped with a pipe that continuously extends to a required air suction mechanism installed on the ground surface, and a crushed earth supply pipe. First, the buried pipe is made airtight by fitting a lid that allows the soil to be introduced into the pipe in an airtight manner, and the spout, which is the tip of the earth and sand supply pipe, is maintained inside the buried pipe at a predetermined horizontal angle θ, and the inner wall of the pipe is The process of inserting the inside of a pipe that can horizontally move the position of the ejection port along the pipe, and reducing the pressure of the air inside the pipe through the pipe by driving an air suction mechanism, and using this reduced pressure, it moves from the starting end to the inside of the pipe in the required section on the ground surface. A step in which crushed earth and sand placed in advance is sent through the earth and sand supply pipe to completely fill it, a step in which the spout of the earth and sand supply pipe is moved horizontally to the next required distance by moving inside the pipe after this filling work is completed, and a step in which the above-mentioned The present invention relates to a method for closing underground pipes, which is characterized by comprising a step of repeatedly and continuously repeating the filling operation to close the entire required length of the buried pipe.

An embodiment of this invention construction method will be described below based on the drawings.

In the figure, 1 is a buried pipe that needs to be blocked, and in this embodiment is a sewer pipe.

2 denotes both ends la and l of the required length of the buried pipe 1 that needs to be closed.
This is a work hole that is excavated from the ground surface to expose b. In this embodiment, an existing manhole is used.

3 is an air suction mechanism used in this invention method, and in this embodiment, a portable air suction device is used.
As shown in FIG. 2, it may be of a stationary type.

This mechanism includes a separation collection tank 6 that connects the drive source 4 with a suction path 5 if necessary, and a wet dust collection tank 7 that communicates with the downstream of this separation collection tank 6 or inserts directly into the suction path. At the same time as placing an air suction device (e.g. Rootstuber) 8
Any mechanism is suitable, regardless of whether it is a portable (vehicle-mounted) or stationary type, as long as the muffling water tank 10 is arranged in the color ejection path 9.

Reference numeral 11 denotes a pipe consisting of a flexible hose that continuously extends from the suction path 5 of the mechanism 3, and the other end of this pipe 11 is connected to the lid 1.
Fit into the mounting hole 2.

Reference numeral 14 denotes a crushed earth and sand supply pipe that air-feeds the crushed earth and sand 14 placed on the ground surface 0 to the required section d of the burial pipe 1.

This pipe 13 can be freely extended to a desired position P of the buried pipe 1 by the action of a winding device 15 that is configured to be expandable and contractible near the earth and sand 14 placed on the ground surface 0, and the pipe 13 can be introduced into the buried pipe 1 with a lid. 12 to maintain airtightness.

16 is a sealing plate that seals the starting end 1a of the buried pipe.

(See FIG. 5B) This sealing plate 16 is removably sealed.

In this embodiment, the screws 17 are used to make it detachable, but other means may of course be used.

18 is the required horizontal angle θ of the spout 19 of the earth and sand supply pipe 13.
This is the inside of the tube that is held in place and is movable along the inner wall 20 of the tube in the horizontal direction H by self-propulsion (as shown in the third figure) or by suction (as shown in the fourth figure).

The inside of the pipe 18 may be of a self-propelled type as shown in the third figure, and may have a built-in TV camera or the like 21 so that the state of earth and sand filling inside the pipe can be visually observed.

22, in order to prevent the earth and sand 14 from collapsing within the pipe 1,
This is a shielding plate with protruding air holes 24 that are used in close contact with the inside of the pipe 18 near the jet port 19.

This invented construction method, which uses such devices and jigs,
First, a working hole 2 is excavated and both ends of the buried pipe 1 that needs to be blocked are made airtight with a sealing plate 16 and a lid 12, and the pipe interior 18, shielding plate 22, pipe 13, etc. are set in the required classification d inside the pipe 1. The device is installed at position P.

If the air suction mechanism 3 is continuously driven in this state, the pressure inside the airtight tube 1 is reduced through the pipe 8'.

This reduced pressure moves the crushed earth and sand 14 from the ground surface 0 to the pipe 1.
3 until the space between the sections d in the tube 1 is completely filled.

The horizontal angle θ of the spout 19 may be set to a value that completely fills the required section d, taking into consideration the hole in the pipe 1, the grain size of the earth and sand 14, the section length d, etc.

At this time, the filling rate of the earth and sand 14 within the required section d may be calculated from the amount of earth and sand 14 theoretically calculated based on the pipe ID diameter and the section length d, or it may be directly observed visually using the TV camera 21 or the like.

Furthermore, measurement may be performed using other indirect measuring devices.

In this way, once the required section d has been completely blocked, the service car 1J is horizontally moved from position P to the next set position Q.
The above earth and sand 14 filling operation is continuously repeated.

The horizontal movement of the pipe inner car 1-8 is carried out by self-propulsion or by the tensile force of the pipe winding mechanism 15.

By repeating such operations, the buried pipe 1 can be completely blocked with earth and sand 14.

As detailed above, the buried pipe blocking method according to this invention does not require any manual labor in the soil, which is associated with risks such as oxygen deficiency accidents and cave-in accidents, and moreover, There is no risk of damaging the buried pipes, so there is no risk of secondary disasters.Moreover, it is a labor-saving work and requires fewer work days, so it is a breakthrough in completely blocking the buried pipes without any negative effects such as traffic congestion. This is a specific construction method.

[Brief explanation of drawings]

Figure 1 is a cross-sectional explanatory diagram showing one embodiment of the buried pipe closure method according to this invention, Figure 2 is a side view of the air suction mechanism used in this invention method, and Figure 3 is also used in this invention method. FIG. 4 is a side view of the tube inner car and the blocking plate, FIG. 5A is a front view of the tube inner car, and FIG. 5B is a side view of the blocking plate. 1... Buried pipe, 1a... Starting end, 1b
...Other end, 3...Air suction mechanism, 8
...Pipe, 12...Lid, 13...
... Sediment supply pipe, 14-... Sediment, 1-8
......In-service car, 19...Spout port, 20.
...Pipe inner wall, d...Required classification, 0...
...Ground surface, L...Required total length.

Claims (1)

[Claims] 1 Gas buried in the soil under roads in urban areas, etc.
A buried pipe for sewerage, water supply, etc. that requires blocking, in which both ends of the buried pipe are exposed to the ground surface, and then the starting end of the buried pipe is airtightly sealed. First, the buried pipe is made airtight by fitting a lid on the other end that allows the pipe that continuously extends to the required air suction mechanism installed on the ground surface and the crushed earth supply pipe to be introduced into the pipe in an airtight manner. At the same time, a step of inserting into the buried pipe a pipe interior that can maintain the spout, which is the tip of the earth and sand supply pipe, at a predetermined horizontal angle θ and move the spout position horizontally along the inner wall of the pipe; A process in which air is depressurized through a pipe by the drive of an air suction mechanism, and due to this depressurization, crushed earth and sand that has been placed in advance on the inside of the pipe and on the ground surface in a required section from the starting end is sent through an earth and sand supply pipe to completely fill it. After this filling work is completed, the spout of the earth and sand supply nozzle is moved horizontally within the pipe to the next required section, and the above filling work is repeated continuously to close the entire required length of the buried pipe. An underground pipe closure method characterized by: