JPH03272380A - Removal method for embedded pipe - Google Patents

Abstract

PURPOSE:To execute a work to remove an embedded pipe with high efficiency by inserting a cutting tool in a part to be removed up to the vicinity of the deepmost part thereof, pulling back the tool as the part to be removed is segmented throughout the whole length thereof, and pulling off obtained beltlike bodies as they are bent. CONSTITUTION:A part 1a to be removed of a feed pipe 1 is dug out only in the one spot of a main branch pipe 2. The feed pipe 1a is cut in a dig out spot A by a known proper pipe outer surface cutter and the main branch pipe 2 is closed by a blocking means. After the part 1a to be removed is purged by means of gas, a tool 3 for weld is inserted, and the other end side of the part 1a to be removed is fused throughout a whole periphery by rotating the tool 3. The tool 3 is pulled back without rotation, and the part 1a to be removed is segmented in a plurality of spots in a peripheral direction throughout a whole length. After the tool 3 is pulled off from the part 1a to be removed, beltlike bodies 11 produced by segmentation of the part 1a to be removed are dug out one by one or a plurality of the beltlike bodies are dug out at a time and pulled off to the spot A side by means of a winder as they are bent. Thereafter, a pull-off hole is filled with a filler, and the dig-out spot A is refilled for restoration to complete a work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing underground pipes, such as metal or resin gas pipes or water pipes, buried underground.

[Conventional technology]

Conventionally, for example, when removing a supply pipe from a city gas supply main or a branch pipe to a consumer, as shown in Figure 3 (a), the part (1a) of the supply pipe (1) to be removed is removed from the main branch pipe ( 2) Excavation on both the side and the opposite side, as shown in Figure 3 (B), both excavation points (A).

(B) Cut the supply pipe (1) respectively, set the pipe extraction device (5) at the excavation point (A) on the main branch pipe (2) side as shown in Figure 3 (C), and As shown in Figure (d), the supply pipe (1) is pulled out straight and by a dimension corresponding to the width (f) of the excavation point (A) using the pipe pulling device (5).
The pulled out portion (lb) of the supply pipe (1) was cut and removed, and the supply pipe (1) was removed by repeating the pulling and cutting and removal.

[Problem to be solved by the invention]

However, since buried pipes such as the supply pipe (1) must be excavated on both sides of the part to be removed (1a), the excavation and backfilling work requires a lot of expense, effort, and time. It takes a lot of effort and time to pull out buried pipes because the process of pulling out and cutting and removing them has to be repeated many times. Requires a pulling device (5);
Overall, there was room for further improvement in terms of cost savings, labor savings, and efficiency improvements.

The objects of the present invention are to significantly reduce the expense, labor and time required for excavation and backfilling work, reduce the labor and time required for pulling out buried pipes, and to use a simple pipe pulling device. The object of the present invention is to make the removal work of buried pipes unnecessary in terms of cost, labor saving, and efficiency.

[Means to solve the problem]

The characteristic means of the present invention is to excavate the part of the buried pipe to be removed at one end thereof, separate the buried pipe at the excavation point, and fuse or cut the part from the separated part to the innermost part of the part to be removed. After inserting a tool and pulling back the tool while cutting the part to be removed over almost the entire length at multiple points in the circumferential direction, and pulling out the tool from the part to be removed, a band-shaped body obtained by dividing the part to be removed. The purpose is to pull it out toward the excavation site while bending it, and its effects are as follows.

[For production]

The buried pipe can be excavated and cut at one end of the part to be removed, and a tool inserted into the part to be removed can be used to pull the part to be removed toward the part to be dug out. Compared to digging out and cutting both sides of the part to be removed, the cost, effort, and time required for excavation and backfilling can be significantly reduced.

In addition, since the strip obtained by dividing the part to be removed in the circumferential direction is pulled out while bending, the effort and time required for pulling out is reduced, compared to repeating the process of pulling out straight and cutting and removing as in the conventional example described above. In addition, the width of the excavated area can be narrowed to reduce the scale of excavation and backfilling.Furthermore, the strip has low pulling resistance and is easy to bend, so a simple pipe pulling device can be used, and artificial pipe removal can be avoided. It is possible to carry out extraction work.

Therefore, by reducing the cost, labor, and time required for narrow excavation and backfilling work in one place, and by reducing the labor and time for pipe pulling work, the removal work of buried pipes can be made more economical, labor-saving, and efficient. It has become possible to perform more advantageously in all aspects.

〔Effect of the invention〕

As a result, underground pipes such as city gas supply pipes and water pipes that are no longer needed can be removed quickly, inexpensively, and with less effort, especially when excavating paved roads, where construction scale and time are an issue. We were able to establish a method for removing buried pipes that is extremely convenient in certain cases.

〔Example〕

Next, examples will be shown.

In the city gas supply piping, as shown in Figure 1 (a), the part (la) of the supply pipe (1) to be removed is removed from the main branch pipe (2).
Dig out only one spot on the side.

As shown in Figure 1 (B), the supply pipe (1) is cut at the excavation point (A) with a known suitable pipe outer surface cutter, and the main branch pipe (2) is sealed with a known suitable closing means. , purge the part to be removed (1a) with gas by appropriate means such as air blowing, and then insert the fusing tool (3) from the cut part into the part to be removed (1a) to remove the part to be removed (1a).
) is cut by rotating the tool (3) over the entire circumference.

As shown in Figure 2, the fusing tool (3) is attached to a torch (3a) connected to a gas cylinder (6) such as acetylene or natural gas and an oxygen cylinder (7) with hoses (8) and (9). An idle roller (3b) is used to move and rotate the torch (3a) in the insertion/removal direction while holding the torch (3a) in a position substantially concentric with the part to be removed (1a).
Attach multiple (preferably 3 or more) flame ports (preferably 3 or more) to blow the flame for melting towards the part to be removed (la).
3c) are distributed in the circumferential direction, and igniters (3d) for the flame ports (3c) are attached so as to be able to be ignited from the outside using a remote controller (10). In other words, after inserting the tool (3) to the innermost part of the part to be removed (la),
Use the igniter (3d) to form a flame at all the flame ports (3C), rotate the torch (3a), and remove the part to be removed (1a).
The other end is fused around the entire circumference.

Next, the tool (3) is pulled back without rotating, and the portion to be removed (1a) is divided over its entire length at multiple locations in the circumferential direction.

As shown in FIG. 1(C), after pulling out the tool (3) from the part to be removed (1a), one strip of the strip (11) obtained by dividing the part to be removed (1a) is One or more pieces are pulled out at a time toward the excavation point (A) while being bent by a winder (4).

Thereafter, a known suitable filler is injected into the extraction hole, the excavated area (A) is backfilled and restored, and the construction work is completed.

[Another example]

Next, another embodiment will be described.

In addition to city gas supply pipes, water pipes, industrial pipes, and other buried metal or resin pipes can be targeted, and these are collectively referred to as buried pipes (1).

The specific configurations of the tube outer surface cutter, tool (3), and winder (4) to be used do not matter. For example, the part to be removed (la)
A blade portion which can be inserted into and removed from the tube can be reciprocated in the radial direction and rotated by external operation, and a known tube inner surface cutter may be used as the tool (3).

It is desirable to seal the pipe to which the part to be removed (la), such as the main branch pipe (2), is connected, using a single non-jet type tool, while fluid transport continues and there is no fluid leakage.

At the excavation point (A), the buried pipe (1) may be separated using a joint without cutting the buried pipe (1).

If there is a joint on the back side of the part to be removed (la), melting or cutting over the entire circumference may be omitted.

The strip (11) may be manually pulled out and bent without using the winder (4).

When the strip (11) is pulled out, it may be twisted at the same time, thereby reliably reducing the pulling resistance.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, FIGS. 1(a) to 2(c) are conceptual diagrams showing the construction procedure, and FIG. 2 is a conceptual diagram of tools. FIG. 3(a) or the frame is a conceptual diagram showing the construction procedure of a conventional example. (1)...Buried pipe, (1a)...Part to be removed, (3)...Tool, (11)...
...band-shaped body, (A)... excavation point. Figure 1

Claims (1)

[Scope of Claims] A part (1a) to be removed of the buried pipe (1) is excavated at one end thereof, the buried pipe (1) is separated at the excavation point (A), and the part to be removed is separated from the separated part. Insert the fusing or cutting tool (3) into the innermost portion of (1a), and pull back the tool (3) while dividing the part (1a) to be removed over almost the entire length at multiple points in the circumferential direction. After pulling out the tool (3) from the part to be removed (1a), the buried pipe is pulled out toward the excavation point (A) while bending the strip (11) obtained by dividing the part to be removed (1a). Removal method.