JPH10184999A - Method for removing decrepit pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily remove a decrepit pipe over the total length. SOLUTION: A towing member 4 is inserted in a decrepit pipe 1 from a first pit 2 side to a second pit 3 side, a pipe breaking member 5 for breaking the decrepit pipe 1 at a plurality of parts in the circumferential direction in the pipe axial direction is connected to the end of the towing member 4 on the first pit 2 side, and fragments of the decrepit pipe 1, broken by the pipe breaking member 5 are pressed from the first pit to the second pit and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing old pipes.

[0002]

2. Description of the Related Art For many years, pipes such as gas pipes and water pipes buried in the ground have been eroded and deteriorated due to their long laying, and leakage from pinholes and other defective parts is concerned. You. Further, if a part of the corroded aging pipe is left unattended, if soil or sand enters the pipe from a part thereof, the ground may collapse. There are a variety of solutions, the most common of which is to remove aging pipes from the ground.
As one of the methods of removing the deteriorated pipe, a method has been proposed in which one end of the deteriorated pipe is grasped, the end of the grasped side is pulled to move forward, and the deteriorated pipe is pulled out from the ground. In this method, a shaft which serves as a working pit for extracting an old pipe is excavated, a drawing device is arranged in the shaft, and a cutter for cutting the extracted old pipe is arranged. When the old pipe whose part is grasped is pulled out with a predetermined stroke, the process of cutting the portion exposed in the shaft by the cutter is repeated to remove the old pipe in the ground. After the aged pipe is removed, the cavity is filled with backfill material such as sand or foam resin to prevent the ground from sinking, or
A new pipeline is provided.

[0003]

However, the above-mentioned removal method has the following problems. That is, when pulling out the old pipe, a large frictional resistance is generated between the old pipe and the earth and sand due to the underground pressure, and thus a traction driving force that exceeds this frictional resistance is required. If the traction drive force is increased in order to overcome the frictional resistance acting on the old pipe, the old pipe may come off at the joint position if the old pipe is connected by a joint. is there.
Conventionally, since it is not detected that the pipe has come off at the position of the joint, the old pipe that has come off remains in the ground, and it may not be possible to remove the old pipe over the entire length. is there.

An object of the present invention is to provide a method for removing an old pipe which can be easily removed in addition to being able to be removed over the entire length of the old pipe in view of the above-mentioned problems in the conventional removal method. Is to provide.

[0005]

In order to achieve this object, according to the first aspect of the present invention, a first vertical shaft and a second vertical shaft for work are provided on a route of an existing pipeline buried underground. In the method of removing an aging pipe laid between the shafts, a traction member is inserted into the aging pipe from the side of the first shaft to reach the side of the second shaft. At the end of the towing member on the side of the first shaft,
At a plurality of locations in the circumferential direction of the deteriorated pipe, a pipe breaking member that breaks in the pipe axis direction is connected and pulled, and the fragment of the deteriorated pipe broken by the pipe breaking member is directed from the first shaft to the second shaft. It is characterized by being extruded and removed.

According to a second aspect of the present invention, in the method for removing an aged pipe according to the first aspect, at least a vertical position of the aged pipe is broken in a circumferential direction.

According to a third aspect of the present invention, in the method for removing an old pipe according to the first aspect, the old pipe is connected through a plurality of joints.

[0008]

According to the first to third aspects of the present invention, the deteriorated pipe is broken at a plurality of locations in the circumferential direction and divided by the pipe breaking member, and a fragment thereof is extruded from the first shaft to the second shaft. Because it is extruded, the old pipe can be removed without leaving it in the ground unlike the case of pulling it out. In particular, according to the third aspect of the invention, since the old pipe is connected via the joint, the joint is also broken when the old pipe is broken, so that the length of the old pipe per unit to be extruded is also reduced. The shorter length also reduces the frictional resistance during extrusion. Moreover,

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a schematic view for explaining a method of removing an aged pipe according to the present invention. In FIG. 1, a first working shaft (starting shaft) is provided on a route of an aged pipe 1 buried underground. 2 and a second shaft (reach shaft) 3 are provided. The present embodiment is directed to a case where the deteriorated pipe 1 having a predetermined length is connected via joints L arranged at a plurality of locations in the laying direction of the deteriorated pipe 1. The first shaft 2 and the second shaft 3 are provided with simple retaining ridges 2a and 3a along the inner wall surface so as to prevent landslide.
A pulling member 4 such as a wire or a rod is inserted into the aged pipe 1 from the first shaft 2 to the second shaft 3, and a pipe breaking member described later is provided at an end of the first shaft 3. Is connected.

In the first shaft 2, the aged pipe 1 has its tube end 1a exposed and facing the first shaft 2, and the reaction force receiving plate 6 is fixed so as to cover the tube end 1a. Have been. As will be described later in detail, the reaction force receiving plate 6 is made of a metal plate having high rigidity and being hardly deformed, and is provided with a cut groove 6a through which the traction member 4 is inserted. Also, the second
A traction device 7 for traction of the traction member 4 is disposed in the shaft 3. The traction device 7 is installed such that one end thereof is in contact with the reaction force receiving plate 6. The device 7 is provided with a guide shaft 71 that is positioned perpendicular to the reaction force receiving plate 6.
A slide member 72 that moves along the guide shaft 71 while holding the traction member 4 therebetween;
And a hydraulic cylinder 73 that pulls the guide shaft 71 when the pulling member 4 is pulled.
, The reaction force receiving plate 6 is configured to receive the reaction force receiving plate 6.

FIG. 2 is a view showing the structure of the pipe splitter 5. In FIG. 2A, the pipe splitter 5 has a tip for joining the pipe splitter 5 and the end of the traction member 4 by screws. A screw hole 51 is provided. The pipe splitter 5 is provided with a plurality of wheel cutters 52 arranged in the body in the circumferential direction at two or more places in the circumferential direction, in this embodiment, two places above and below, in parallel to the axial direction of the deteriorated pipe 1.
The wheel cutter 52 is configured such that the diameter thereof is gradually increased from the front end to the rear end of the pipe splitter 5 and the old pipe 1 is broken in a stepwise manner while moving inside the old pipe 1. Although the diameter of the wheel cutter 52 is sequentially increased, the wheel cutter 52 is blocked and connected so that the increase in the diameter can be set according to the diameter of the old pipe 1 and the traction force of the traction device 7. Although not shown, the blocks supporting the wheel cutter 52 have a structure in which they are fitted to each other, and can be connected by pins inserted into the fitted portions. Note that, instead of a block structure for supporting the wheel cutter 52, the body of the pipe splitter 5 is formed into a tapered shank or a straight shank, and the wheel cutter 52 is arranged in advance for the body. Is also possible.

On the rear side of the body of the pipe splitter 5,
A connecting member 9 for connecting a collecting member 8 described later is connected by a pin 10. The collection member 8 is an old pipe 1
A wire or rod-like traction member 8A having a length corresponding to the laying length of the wire, and having a threaded portion at the tip,
A cover member 8B having a dish-shaped cross section sized to be integral with the rear end of the traction member 8A and capable of covering the end face of the deteriorated pipe 1.
And The collection member 8 is a pipe splitter 5
And after reaching the second pit 3, it is separated from the pipe splitter 5 and is towed by the towing device 7. The wheel cutter 52
Is provided at a plurality of positions in the circumferential direction in the body of the pipe splitter 5 described above, so that the number of divided pieces of the aging pipe 1 broken in the circumferential direction can be determined. As shown in FIG. It is also possible to provide at three equally spaced positions in the circumferential direction. When the number of wheel cutters 52 arranged in the circumferential direction of the body of the pipe splitter 5 is increased in this manner, the circumferential length of the fragment of the aged piece 1 that is broken and divided is shortened, so that handling during removal is simplified. .

In this embodiment, the old pipe 1 is removed by the following procedure using the above configuration. First, a wire or rod-like traction member 4 is inserted into the aged pipe 1 from the second shaft 3 side.
To reach the end of the traction member 4 toward the first shaft 2. On the side of the first shaft 2, a pipe splitter 5 is connected to an end of the traction member 4. Pipe splitter 5
The connection between the traction member 4 and the traction member 4 is made by fastening the traction member 4 to the screw hole 51 of the pipe splitter 5 as shown in FIG.

Next, a traction device 7 is installed in the second shaft 3,
The towing device 7 is installed such that one end of the guide shaft 71 acts on the reaction force receiving plate 6. Then, the traction device 7 is driven such that the traction member 4 is sandwiched between the slide members 72 and the hydraulic cylinder 73 causes the slide member 72 to be pulled. The traction force of the traction device 7 causes the pipe splitter 5
Is pulled from the first shaft 2 to the second shaft 3, and breaks the vertical position of the deteriorated pipe 1 in the circumferential direction during the towing process. At this time, since the traction reaction force of the traction device 7 acts on the pipe end 1a of the deteriorated pipe 1 via the guide shaft 71 and the reaction force receiving plate 6, the traction force is applied in the axial direction of the deteriorated pipe 1 with the traction force. Can be offset by the traction reaction force, and the aged pipe 1 is prevented from falling into the second shaft 3.

When the pipe splitter 5 is pulled from the first shaft 2 to the second shaft 3 by the pulling force of the pulling device 7, the deteriorated pipe 1 is broken at the upper and lower positions in the circumferential direction as described above and laid. In the direction, the joint L is also broken, so that the fastening with the joint L is released, so-called joint L
From the state. When the pipe splitter 5 moves while being towed, the recovery member 8 connected to the rear side of the body also moves, and the cover member 8B moves the old pipe 1
Approach the end face of.

On the other hand, the pipe splitter 5 is
Is reached, the pipe splitter 5 is taken out of the deteriorated pipe 1, and the traction member 8A of the collection member 8 is removed from the connecting member 9 connected to the pipe splitter 5. At this time, the reaction force receiving plate 6 is also removed so that the deteriorated pipe 1 comes out. The traction member 8A is
When the towing is started by being connected to the towing device 7 by means not shown, as shown in FIG. 3, when the towing starts, the cover member 8B comes into contact with the end face of the deteriorated pipe 1 exposed from the first shaft 2. The old pipe 1 is brought into contact with the first vertical shaft 2 and pushed toward the second vertical shaft 3. Although the reaction force receiving plate 6 is shown in FIG. 3, as described above, the reaction force receiving plate 6 is removed at the same time as the pipe splitter 5 is removed.
The old pipe 1 has the same function as the reaction force receiving plate 6.
Plate that does not hinder the escape of the
Is indicated by reference numeral 6 '). Cover member 8
The deteriorated pipe 1 pressed by B protrudes from the second shaft 3, but is separated from the joint L, and thus falls into the second shaft 3 in units of a predetermined length as shown in FIG. .

[0017]

As described above, according to the first to third aspects of the present invention, the aged pipe is broken and divided at a plurality of locations in the circumferential direction by the pipe breaking member, and the fragment is cut from the first shaft to the first shaft. Since the pipe is extruded toward the two shafts, the old pipe is extruded. Therefore, unlike the case where the old pipe is pulled out, the old pipe can be removed without being left in the ground over the entire length of the old pipe. In particular, according to the third aspect of the present invention, the aging pipe is connected via a joint,
The joint part is also broken when it is broken, so the length of the aged pipe per unit to be extruded is also shorter, so the frictional resistance at the time of extrusion is reduced. Removal is easy.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating a method for removing an aged pipe according to the present invention.

FIGS. 2A and 2B are a sectional view and a perspective view of a main part for describing a configuration of an apparatus used in the removal method shown in FIG.

FIG. 3 is a schematic diagram for explaining one embodiment of the removal method shown in FIG.

FIG. 4 is a partial view showing a state of discharge of an aged pipe in the embodiment shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aged pipe 2 First shaft corresponding to starting shaft 3 Second shaft corresponding to reaching shaft 4 Traction member 5 Pipe splitter 52 Wheel cutter equivalent to pipe breaking member 8 Recovery member 8B Cover member

Claims (3)

[Claims] 1. An old pipe for work is provided on a route of an existing pipeline buried in the ground, and a first shaft and a second shaft for work are removed, and an old pipe laid between the two shafts is removed. In the method of construction, a traction member is inserted from the side of the first shaft into the deteriorated pipe to reach the side of the second shaft, and the end of the traction member is connected to the end of the traction pipe on the side of the first shaft. A plurality of pipe rupture members that break in the pipe axis direction are connected and pulled at a plurality of locations in the direction, and the fragments of the aged pipe broken by the pipe rupture members are extruded from the first shaft to the second shaft and removed. A method of removing old pipes. 2. The method for removing an aging pipe according to claim 1, wherein the aging pipe is broken at least in a vertical direction in a circumferential direction. 3. The method for removing an aging pipe according to claim 1, wherein said aging pipe is connected via a plurality of joints.