JPH10184994A - Aging pipe removal method - Google Patents

Abstract

(57) [Summary] [Purpose] It is now possible to completely remove aging pipes buried underground and whose length should be removed over the entire length of the pipes, even if provisional instructions or joints are interposed in the middle. I do. A drive shaft having an operating member capable of reciprocating at a predetermined stroke is disposed in a first shaft, a cutter for cutting an aged pipe is disposed in a second shaft, and the drive source is operated. At the tip of the member, there is provided a pressing member 6 that can abut on one end of the old pipe, pushes the old pipe 1 toward the second shaft 3 when the driving source 5 moves forward, and after the driving source 5 returns, the pressing member 6, the drive source 5 is moved forward again, and the operation of pushing out the deteriorated pipe 1 toward the second shaft 3 is repeated. In the second shaft 3, other than the deteriorated tube 1 pushed out by the forward movement of the drive source 5, The end is cut by the cutter 9, and the addition of the pressing member 6 and the cutting of the other end of the deteriorated pipe 1 are repeated, whereby the deteriorated pipe 1 is pressed and moved toward the second shaft 3 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 buried underground.

[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.
One of the methods for removing old pipes is to cut open a part of the old pipe in the circumferential direction without excavation, break it, and pull out fragments from the ground. However, when the old pipe is broken, a considerable driving force is required to move the broken member in the pipe due to the wall thickness of the old pipe. For this reason, the driving source becomes large, and the working environment including noise may deteriorate.

Therefore, instead of such a method, there has been proposed a method of grasping one end of an old pipe, pulling the end on the gripped side to advance the pipe, and pulling out the old pipe from the ground. In this method, a shaft which is a work pit required for drawing out the deteriorated pipe is excavated, a drawing device is arranged in the shaft, and a cutter for cutting the drawn deteriorated tube 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. The cavity after the aged pipe is removed is filled with a backfill material such as sand or foamed resin to prevent the ground from sinking.

[0004]

However, the above-mentioned removal method has the following problems. In other words, the deteriorated pipes that constitute the pipeline may be connected by a joint in the middle of the pipe. There is a possibility of falling out. If the end of the old pipe comes off at the joint, the phenomenon cannot be detected, and the old pipe may remain in the ground.
In addition, the length of cutting is limited due to the arrangement of the extraction device and the cutter in the same shaft. For this reason,
In order to reduce the repetition of the pulling-out operation and the cutting operation by lengthening the cut length, the shaft must be enlarged, and the excavation operation becomes large.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional method for removing old pipes, the present invention aims to remove old pipes that are buried in the ground and have a length to be removed, even if provisional instructions or joints are interposed in the middle. It is an object of the present invention to provide a method for removing aging pipes that can be completely removed over the entire length. Further, an object of the present invention is to reduce the time required for excavation work accompanying the removal by reducing the size of the shaft provided for removal to the minimum necessary size in which the equipment used for removal can be installed. It is an object of the present invention to provide a method for removing an aging pipe that can reduce labor.

[0006]

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 two shafts, a driving source having an operating member capable of reciprocating at a predetermined stroke is disposed in the first shaft, and a driving source is provided in the second shaft. A cutter for cutting the aged pipe is arranged, and a pressing member capable of contacting one end of the aged pipe is provided at a tip of an operating member of the drive source, and the aged pipe is moved to a second position when the drive source moves forward. Pushing the shaft toward the shaft, and after returning the drive source, repeating the operation of adding the pressing member and moving the drive source forward again to push the aged pipe toward the second shaft, and in the second shaft, Cut the other end of the deteriorated pipe extruded by the forward movement of the source with a cutter. The old pipe by repeating the cutting of the other end of replenishment and the old tube of said pressing member is characterized in that removed by pressed and moved toward the second vertical shaft.

[0007]

According to the first aspect of the present invention, the old pipe is pushed toward the second shaft regardless of the length of the buried old pipe by moving the drive source forward while adding the pressing member. be able to. For this reason, since only the pressing force from the drive source acts on the deteriorated pipe, unlike the case where the deteriorated pipe is pulled out, the deteriorated pipe does not fall out of the joint portion and remains in the ground.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram for explaining a method of removing an aged pipe according to the present invention. In FIG. 1, a first shaft for work (starting) is provided on a path of an aged pipe 1 buried underground. A shaft 2 and a second shaft 3 are provided. The first shaft 2 is provided with a plate-shaped reaction force receiving member 4 which receives a reaction force generated in a drive source 5 described later and also serves as a mountain retaining member. The reaction force receiving member 4 is disposed on the inner wall surface of the first shaft 2 so as to face a wall surface located in a direction opposite to the pushing direction of the deteriorated pipe 1 corresponding to the direction shown by the arrow in FIG.

The drive source 5 is constituted by a device for generating a driving force for pressing and moving the aged pipe 1 toward the second shaft 3. In this embodiment, a piston capable of reciprocating in a hydraulic cylinder is provided. Is used as an operating member. A pressing member 6 is fastened and integrated with the operating member of the drive source 5 at its front end, that is, at the front end in the pushing direction (the direction indicated by the arrow in FIG. 1) of the deteriorated pipe 1. The pressing member 6 is located at a position facing the end of the old pipe 1.
A chuck member 6A whose inner diameter can be changed according to the outer diameter of the chuck member 6A is located, and the aged pipe 1 can be inserted into the chuck member 6A. The chuck member 6A has a configuration detachable from the pressing member 6, and can grip the outer peripheral surface of the deteriorated pipe 1 by an external operation. A receiving surface to be contacted is provided. The reciprocating stroke of the drive source 5 is set to a length that allows a new pressing member 6 to be added in the first shaft 2. In other words, one movement of the pressing member 6 (corresponding to the length indicated by the symbol L in FIG. 1) is equivalent to the movement stroke of being pushed into the ground together with the deteriorated pipe 1. Thereby, once the aged pipe 1 is extruded by the stroke of one pressing member, and the pressing member 6 and the operating member of the drive source 5 are separated and the operating member is moved back, the pressing member 6 and the operating member And a new pressing member 6 can be added between them.

In this embodiment, the aging pipe 1 is moved from the first shaft 2 to the second shaft 3 by using the driving source 5 having the above-described structure.
The old pipe 1 is removed by pushing it toward the side. In removing the aging pipe 1, a driving source 5 is installed inside the first shaft 2. The driving source 5 is mounted on the upper surface of the position adjusting plate 7 arranged at the bottom of the first shaft 2, and the axis of the pressing member 6 and the axis of the deteriorated pipe 1 are aligned.

On the other hand, before the driving source 5 is installed in the first shaft 2, a reaction force receiving member is provided on the inner wall surface of the first shaft 2 which is located in a direction opposite to the direction in which the aged pipe 1 is pushed out. 4 is driven, the pressing surface of the position holding member 8 of the drive source 5 installed in the first shaft 2 is applied, and a reaction force is applied to the drive source 5 when the aging pipe 1 is extruded. Be able to be.

Before the aging tube 1 is pushed out, the driving source 5 has a pressing member 6 attached to the tip of the operating member. The pressing member 6 is opposed to one end of the deteriorated pipe 1 exposed from the wall surface of the first shaft 2, and is buried in the soil while holding the deteriorated pipe 1 that has entered the chuck member 6A. The aged pipe 1 is moved by a stroke in a pushing direction (a direction indicated by an arrow in FIG. 1). One end of the deteriorated pipe 1 that has entered the chuck member 6A has its end face abutted on a receiving surface (not shown) inside the chuck member 6A, and its outer peripheral surface is gripped, so that it is parallel to the extrusion direction. Is set so that it can be moved to. That is, a gap is not formed between the inner peripheral surface of the chuck member 6A and the outer peripheral surface of the deteriorated pipe 1, so that one end of the deteriorated pipe 1 is not inclined when the deteriorated pipe 1 is extruded. . As a result, the aging pipe 1 is
When extruded, the one end does not tilt, so that the generation of a component force generated when the end is tilted is prevented, and the extruding force is directly used as the thrust for extrusion.

Before and after the installation of the driving source 5 and the gripping of one end of the deteriorated pipe 1 by the chuck member 6A, a cutter 9 for cutting the deteriorated pipe 1 is disposed in the second shaft 3. When the aged pipe 1 is pushed from the first shaft 2 toward the second shaft 3 by a predetermined stroke by the drive source 5, the other end of the aged tube 1 is exposed in the second shaft 3 as shown in FIG. .

When the other end of the aged pipe 1 is exposed to the second shaft 3 due to the forward movement of the drive source 5, the other end is cut by the cutter 9. When the cutting work of the other end of the deteriorated pipe 1 is completed,
The pressing member 6 and the operating member of the driving source 5 are separated, and in this state, the driving source 5 is moved back and only the operating member is moved to the forward movement start position. As illustrated in FIG. 3, a new pressing member 6 is fastened to the operating member that has returned to the forward movement start position, and is added to the operating member. The drive source 5 moves forward again to push out the deteriorated pipe 1. Hereinafter, by repeating the reciprocating operation of the drive source 5, adding the new pressing member 6 at the time of the backward movement, and cutting the other end of the deteriorated pipe 1 by repeating,
The buried aging pipe 1 can be removed by moving it toward the second shaft 3 over the entire length of the buried section.

According to the above-described embodiment, unlike the conventional method of cutting the end of the old pipe 1 in the first shaft 2 in which the device for pulling and driving the old pipe 1 is disposed, the end to be cut is Since the portion is the end located on the side of the second shaft 3, the work space required for cutting is not consumed for occupying the device for towing. Thereby, even when the size of the first shaft 2 is limited, the reciprocating stroke of the drive source 5 can be increased, and the pushing-out amount of the deteriorated pipe 1 by the pressing member 6 is increased to remove the deteriorated pipe 1. The time can be shortened.

In the above embodiment, the hydraulic cylinder is used as the drive source 5 used for pushing out the aged pipe 1. However, the present invention is not limited to this configuration. The aging pipe 1 may be extruded while doing so. In addition, the configuration of the chuck member 6A attached to the pressing member 6 may also
Not only the inner diameter can be changed according to the outer diameter of the old pipe 1, but also a member having an inner diameter corresponding to the outer diameter of the old pipe 1 to be removed and into which the end of the old pipe 1 can be inserted. It may be prepared appropriately and attached.

[0017]

As described above, according to the first aspect of the present invention, by moving the driving source forward while extending the pressing member, the aging of the buried pipe is irrespective of the length of the buried pipe. The tube can be pressed and moved toward the second shaft. For this reason, since only the pressing force from the drive source acts on the deteriorated pipe, unlike the case where the deteriorated pipe is pulled out, the deteriorated pipe does not fall out of the joint portion and remains in the ground. This makes it possible to completely remove the deteriorated pipe to be removed over the entire length even if a joint is interposed in the middle of the pipe. According to the first aspect of the present invention,
Since the drive source used to remove the deteriorated pipe is located in a different shaft than the shaft that cuts the end of the deteriorated pipe, it is necessary to perform the extruding and cutting work of the deteriorated pipe in the same shaft. And the size of the shaft can be reduced to the minimum size required for installation of the driving source. As a result, the work time required for excavating the shaft can be reduced,
Excavation work can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram for explaining one embodiment of the removal method shown in FIG.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aged pipe 2 First shaft corresponding to starting shaft 3 Second shaft corresponding to starting shaft 4 Reaction force receiving member 5 Drive source 6 Pressing member 6A Chuck member 9 Cutter

Claims (1)

[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 construction method, a driving source having an operating member capable of reciprocating at a predetermined stroke is disposed in the first shaft, a cutter for cutting the aged pipe is disposed in the second shaft, and a tip of the operating member of the driving source is provided. A pushing member that can be brought into contact with one end of the aging pipe is provided, the aging pipe is pushed toward the second shaft when the driving source moves forward, and after the driving source returns, the pressing member is added. The drive source is moved forward again to repeat the operation of pushing the aged pipe toward the second shaft, and in the second shaft, the other end of the aged pipe extruded by the forward movement of the drive source is cut by a cutter. The addition of the pressing member and the cutting of the other end of the deteriorated pipe are repeated. Removal method of aging tube, characterized in that the aging tube to remove by pressed and moved toward the second vertical shaft in Succoth.