JP2939267B2 - Removal method of buried pipe - Google Patents

Description

The present invention relates to a method for removing a buried pipe such as a metal or resin gas pipe or a water pipe buried underground.

[Conventional technology]

Conventionally, for example, when removing a supply pipe from a main gas supply pipe or a branch pipe to a demand destination, as shown in FIG.
The part (1a) to be removed of the supply pipe (1) is dug on both the main pipe (2) side and the opposite side, and as shown in FIG. 3 (b), both excavated points (A) and (B) Each of the supply pipes (1) is cut, and as shown in FIG. 3 (c), a pipe drawing device (5) is set at the excavated point (A) on the main pipe (2) side. As shown in ()), the supply pipe (1) is drawn straight by the pipe drawing device (5) and by the dimension corresponding to the width () of the excavated portion (A), and the drawn part (1b) of the supply pipe (1) is drawn. Were cut and removed, and the supply pipe (1) was removed by repeating the drawing and the cutting and removing.

[Problems to be Solved by the Invention] However, since buried pipes such as supply pipes (1) must be excavated on both sides of the removal target portion (1a), a large amount of cost, labor and time are required for excavation and backfilling work. It takes time, and since the drawing and cutting of the buried pipe must be repeated many times, it takes a lot of trouble and time to pull out the buried pipe, which leads to overall cost savings, labor savings and improved efficiency. There was room for further improvement in terms of aspect.

The object of the present invention is to cover the costs of drilling and backfilling operations,
In addition to greatly reducing the number of operations and time, the number of operations and time required for pulling out buried pipes are reduced, and the removal work of buried pipes can be performed advantageously in all aspects of cost, labor saving and efficiency. is there.

[Means for solving the problem]

Characteristic means of the present invention is to excavate a part to be removed of a buried pipe only at one end side, cut the buried pipe at the excavated point, insert a pipe inner surface cutter into the part to be removed from the cut part, The other end side of the removal target portion is cut with the pipe inner surface cutter, and after extracting the tube inner surface cutter from the removal target portion, a pipe drawing device including a chuck for holding and crushing the removal target portion, The withdrawal target portion is pulled out to the excavated portion side while being crushed and bent, and the operation and effect are as follows.

(Operation)

The buried pipe is dug and cut at only one end of the part to be removed, and the other end is cut by the pipe inner surface cutter inserted into the part to be removed. The cost, means and time required for excavation and backfilling can be significantly reduced as compared to excavation and cutting.

In addition, since the pull-out is performed while bending the portion to be removed, the number and time required for pull-out can be reduced and the width of the excavated portion can be reduced, rather than repeating the process of pulling out and cutting and removing straight as in the conventional example described above. Drilling and backfill membranes can be reduced.

Furthermore, since the pipe pulling device is provided with a chuck for pinching and crushing the portion to be removed, the tube is crushed at the same time as the tube is pinched by the pipe pulling device, and the tube is bent at the same time as the crushing, and By bending the collapsed portion, the removal target portion can be easily and quickly bent and pulled out.

Therefore, the cost, labor and time required for narrow excavation and backfilling work at one location are reduced, and the labor and time required for pipe drawing work are reduced. It can be implemented more advantageously in all aspects.

〔The invention's effect〕

As a result, removal of unnecessary buried pipes such as city gas supply pipes and water pipes can be carried out inexpensively, with a small number of steps, and quickly. In this case, a very convenient method of removing buried pipes could be established.

〔Example〕

 Next, examples will be described.

In the city gas supply pipe, as shown in FIG. 1 (a), the part (1a) of the supply pipe (1) to be removed is a main branch pipe (2).
Dig only at one side.

As shown in FIG. 1 (b), the supply pipe (1) is cut at the excavated point (A) with a known suitable pipe inner surface cutter, and the main pipe (2) is sealed with a known suitable closing means. ,
Thereafter, a known suitable pipe inner surface cutter (3) is inserted from the cut portion into the removal target portion (1a), and the other end of the removal target portion (1a) is cut into the blade portion (3) of the pipe inner surface cutter (3). Cut in 3a). The pipe inner surface cutter (3) can reciprocate and rotate the blade portion (3a) in the radial direction by an external operation.

After pulling out the pipe inner surface cutter (3) from the part to be removed (1a), as shown in FIG. 1 (c), a pipe drawing device (4)
To the part to be removed (1a).

As shown in FIG. 2, the pipe drawing device (4) includes a movable member (4b) which is reciprocated in the longitudinal direction of a portion (1a) to be removed by the fluid pressure cylinder (4a), and a fluid pressure cylinder (4c). Is provided with a chuck (4d) for pinching and crushing the part (1a) to be removed by the controller, and the chuck (4d) is automatically operated by the fluid pressure cylinders (4a) and (4c) by the controller (4e). Process of pinching and crushing the removal target part (1a) with
The step of pulling out the removal target portion (1a) by the movement of the movable member (4b), the step of opening the chuck (4d), and the step of returning the movable member (4b) are repeated in this order.

As shown in FIG. 1 (c), the part (1a) to be removed is pulled out to the excavation point (A) by the pipe drawing device (4),
The removal target portion (1a) is artificially bent, and the removal target portion (1a) is pulled out while being bent without cutting the whole.

Thereafter, a well-known appropriate filler is injected into the drawing hole, and the excavated portion (A) is buried and restored to complete the construction.

(Another embodiment)

 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 used, and these are collectively referred to as buried pipes (1).

The specific configuration of the pipe inner surface cutter, the pipe inner surface cutter (3), and the pipe drawing device (4) to be used does not matter.

It is desirable that the sealing of the pipe to which the part to be removed such as the main pipe (2) is connected is performed in a state where there is no fluid leakage while fluid transport is continued by a non-spray type tool.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention by the entry is not limited to the structure of the attached drawings.

[Brief description of the drawings]

FIGS. 1 and 2 show an embodiment of the present invention. FIGS. 1 (a) to 1 (c) are conceptual diagrams showing a construction procedure, and FIG. 2 is a conceptual diagram of a pipe drawing device. Fig. 3 (a) to (d)
FIG. 2 is a conceptual diagram showing a construction procedure of a conventional example. (1) ... buried pipe, (1a) ... part to be removed, (3) ...
… Pipe inner surface cutter, (4)… Pipe puller, (4d)…
Chuck, (A) ... Excavated location.

Continuation of front page (56) References JP-A-62-41485 (JP, A) JP-A-58-132667 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16L 1 / 02

Claims (1)

(57) [Claims] 1. A part (1a) to be removed of a buried pipe (1) is excavated only at one end thereof, the buried pipe (1) is cut at the excavated point (A), and the part to be removed is cut from the cut part. (1a) Insert the pipe inner surface cutter (3), cut the other end of the part to be removed (1a) with the pipe inner surface cutter (3), and remove the pipe inner surface cutter (3) After being pulled out from the part (1a), the pipe drawing device (4) provided with a chuck (4d) for holding and crushing the part (1a) to be removed while crushing and bending the part (1a). Removal method of buried pipe to be pulled out to the excavation point (A) side.