JPH08128564A - Removing work method for buried pipe - Google Patents

Abstract

PURPOSE: To prevent a pipe body from being accidentally torn in the middle when a buried remaining unnecessary pipe is pulled out so as to surely extract the pipe body. CONSTITUTION: A terminal end of a remaining unnecessary pipe 2 separated from a conduit line 1 is exposed and opened in the inside of an excavation pit A, and from the opening part, a core wire material 3 such as a wire and a rod provided with necessary tensile strength is passed through into the pipe 2 to be removed, and then, a filler material 4 such as resin and mortar provided with an adhering properly for the core material 3 and a pipe body is filled in the pipe 2 so as to integrate the core material 3 and the pipe body together. After hardening the filler material 4, the terminal end of the unnecessary pipe 2 with which the core material 3 is integrated is chucked by means of an extracting device 8 so as to be towed, and extraction is carried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removal construction method for separating a residual unnecessary pipe such as an unnecessary buried pipe, which is no longer needed, from a conduit line and pulling it out.
The present invention relates to a method for removing a buried pipe for a pipe in which a pipe body is torn off by a tensile load when the pipe body is pulled out by holding one end like a lead pipe or a pipe body which has deteriorated.

[0002]

2. Description of the Related Art In gas pipes, water pipes, etc., there may be a case where a service pipe that has been discontinued due to a rebuilding of a house is left as it is, and such unnecessary pipes are pulled out and removed. There is a need to.

Regarding removal of such a residual unnecessary pipe,
Prior arts such as those described in, for example, JP-A-2-292590 and JP-A-3-9188 have been proposed so far, and in general, a residual pull-in pipe to be removed is a conduit. After cutting and separating from the road, the end of the pull-in pipe is exposed in the excavation pit and chucked by the pulling device, and this is pulled to pull out from the soil.

[0004]

In this case, the residual unnecessary pipe to be drawn out is, for example, a water service lead-in pipe using a lead pipe. When one end of the pipe is clamped and pulled out by the above-mentioned removal method, the lead pipe has a small shearing stress against a tensile load, so that the pipe body is torn off on the way and there is a problem that the pulling out becomes impossible.

An object of the present invention is to provide a method for removing a buried pipe which does not cause such an inconvenience.

[0006]

As means for achieving the above object, the present invention is to open and cut a working pit on the terminal side of an unnecessary pipe separated from a conduit passage when pulling out a residual unnecessary pipe,
After exposing the terminal side of the unnecessary pipe in the pit and opening it, the core wire material such as a wire or rod having a required tensile strength in the pipe to be removed from the opening is penetrated so as to be longitudinally cut into the pipe, The pipe is filled with an injection material such as a resin or mortar which has adhesiveness between the core wire and the pipe body and cured, and after the curing, the end of the unnecessary pipe is clamped and pulled out by a pulling device installed in the pit. It is characterized in that it is constructed like this.

Further, according to the present invention, a passage forming hose for letting a filler such as mortar into the unnecessary pipe to be removed is longitudinally inserted into the pipe in parallel with the core wire, and then the above-mentioned injection material is added. It is filled and hardened, and one end of this passage forming hose is connected to the supply source of the filling material, and the other end is open to the side opposite to the drawing direction. Another feature is that the filling material is supplied to the hose and the filling material is filled in the hollow holes formed by the drawing simultaneously with the drawing operation.

[0008]

[Operation] According to the removal method as described above, first, the core wire is integrally inserted and adhered into the remaining unnecessary pipe to be removed, and the unnecessary pipe to be removed is subjected to shear stress against a tensile load. Therefore, even if one of the unnecessary pipes is a lead pipe or a pipe that has deteriorated when the pipe is clamped at one end of the pipe and pulled out, The phenomenon of tearing off does not occur, and the problem of falling into a situation where it cannot be pulled out does not occur.

In addition, a hose for forming a passage through which a filling material such as mortar is inserted is inserted and bonded in parallel with the core wire into the unnecessary pipe to be removed, and the hose is interlocked with the drawing operation during the drawing process of the unnecessary pipe. -When the filling material is supplied to the hose, the filling material flows out through the hose to the side opposite to the drawing direction, and this is filled in the cavity hole created by the drawing, so unnecessary pipes The filling process into the cavity hole is simultaneously performed in conjunction with the drawing process of (1), and the efficiency of the removal work can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 1 is a conduit line laid under a road or the like, and 2 is a lead pipe using a lead pipe branched from this conduit line and drawn into a customer. This lead pipe is discontinued. It is a residual unnecessary tube that has been
It is a pipe to be removed according to the present invention.

FIG. 1 shows a pretreatment process before the drawing operation. The residual unnecessary tube 2 is cut and separated in advance by a suitable method at the connection portion with the conduit line 1 before removal. As this method, generally, a method of excavating the road side to open and cut a working pit to expose and cut the connecting portion between the conduit 1 and the residual unnecessary pipe 2 is generally used. As a method, a method may be adopted in which a pipe cutter is inserted into the pipe through the end opening of the residual unnecessary pipe 2 to be described later and the pipe is cut.
At this time, the separation port of the separated conduit 1 is hermetically sealed.

Next, a working pit A is excavated at the end side of the residual unnecessary pipe 2, and the end of the residual unnecessary pipe 2 is exposed and opened in this pit A. Then, a core wire 3 having a required tensile strength, such as a wire or a rod, is inserted through the terminal opening of the residual unnecessary tube 2 so as to be vertically cut into the tube.

After the core wire 3 is inserted, an injection material 4 such as a resin or mortar having adhesiveness between the core wire 3 and the pipe body is filled into the inside of the residual unnecessary pipe 2 through the end opening. In the case of the embodiment shown in FIG. 1, the introduction of the injection material 4 is provided with a resin injection tank 6 that is extruded by the blow pressure from the blower 5,
A method is adopted in which the tip of the introduction hose 7 connected to the resin outlet of the tank 6 is drawn into the pipe and the injection material 4 (resin) is introduced into the pipe through the hose 7. The method may be a method of pouring the injectable material 4 into the tube by using the end opening of the residual unnecessary tube 2 as an inlet.

As shown in FIG. 2, it is desirable that the injection material 4 be filled so as to fill the entire length of the residual unnecessary tube 2 so that the inside of the injection material 4 is filled. Alternatively, it may be partially locally filled. In this case, at least the required region near the end (opposite opening on the side of the conduit 1) on the opposite side with respect to the extraction direction of the unnecessary pipe 2 described below is filled with the injection material 4, and this portion is filled. Then, the filling material 4 is adhered so that the tube body and the core wire material 3 are integrated.

After the injection material 4 is hardened, the drawing step shown in FIG. 2 is performed. In this process, a well-known drawing device 8 is installed in the work pit A, and the residual unnecessary tube 2 is attached to the chuck portion 8a.
The end side of the tube is clamped, and the unneeded pipe 2 is pulled out toward the pit A by sliding the chuck portion 8a back and forth.

In this case, a core wire 3 is inserted into the remaining unnecessary tube 2 to be pulled out, and the core wire 3 is adhered to the tube body by an injection material 4 filled in the tube. Therefore, the residual unnecessary tube 2 to be removed has the shearing stress against the tensile load increased by the core wire 3 that is integrally inserted and bonded in the tube, so that the end of the unnecessary tube 2 is chucked to the pulling device 8. Unnecessary pipe 2 even if towed
The pipe body of will not be torn carelessly from the middle, and the problem of falling into a situation where it cannot be pulled out can be avoided.

FIG. 3 shows another embodiment of the present invention. In this embodiment, in addition to the core wire 3 described above, a hose 9 forming another mortar injection passage is inserted into the residual unnecessary pipe 2 so as to vertically cut through the pipe in parallel with the core wire 3. Has been done,
Unnecessary tube 2 which is integrated with core wire 3 by injecting material 4 filled in the tube and is withdrawn by this hose 9.
A passage is formed in the pipe.

The hose 9 is an end portion on the side opposite to the drawing direction of the unnecessary pipe 2 (the side of the separation opening on the side of the conduit line 1).
Is opened, and the tip of the other hose end is connected to the outlet of the mortar injection tank 6a. During the drawing process, the mortar 10 is removed from the tank 6a by the blowing pressure from the blower 5a in conjunction with this. It flows out through the hose 9 to the side opposite to the pull-out direction.

According to this embodiment, during the drawing process of the residual unnecessary pipe 2, the filling material 10 such as mortar is sequentially passed through the hose 9 inserted into the unnecessary unnecessary pipe 2 through the hose 9 in the opposite direction to the drawing direction. The filling material 10 is sequentially filled into the hollow holes 11 in the soil that are supplied and flown out to the hollow holes 11 in the soil.
The mortar filling for 1 is performed simultaneously, and the efficiency of the removal work is improved.

[0020]

As described above, according to the removal method of the present invention, the core wire is inserted into the unnecessary pipe to be pulled out so as to be integrated with the pipe body, and the residual unnecessary pipe to be removed is removed by the core wire. Since the shearing stress against the tensile load is increased, there is no phenomenon that the pipe body of the unnecessary pipe is torn off in the middle when the pipe body is clamped at one end by the pulling device and pulled out. Even if the unnecessary pipe is, for example, a water supply lead-in pipe using a lead pipe or a pipe body that has deteriorated, it is possible to eliminate the inconvenience of not being able to be pulled out.

Further, in the case where the passage is formed in the unnecessary pipe to be pulled out through the insertion hose and the filler is supplied from the hose to the side opposite to the pulling direction during the pulling process, Since the filling material such as mortar can be simultaneously filled in the hollow holes in the soil generated in the process, it is not necessary to separately fill the cavities created in the hollow holes after the drawing process with the filling work such as mortar. It is possible to improve efficiency.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a pretreatment process before drawing out of a buried pipe removing method according to the present invention.

FIG. 2 is an explanatory view showing a drawing process of the buried pipe removing method according to the present invention.

FIG. 3 is an explanatory view showing another embodiment of the buried pipe removing method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conduit line 2 Intake pipe (remaining unnecessary pipe) 3 Core wire 4 Injecting material (resin) 5 Blower 6 Resin injecting tank 6a Mortar injecting tank 7 Introducing hose 8 Extracting device 9 Hoth 10 Filling material (mortar) 11 Cavity Hole A work pit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Igarashi 3-18-3 Daikan City, Kanagawa Prefecture Hakko Technology Development Center Co., Ltd.

Claims (4)

[Claims] 1. A removal method in which a residual unnecessary pipe such as an unnecessary buried pipe that is no longer needed is cut off from a conduit line and pulled out, and a working pit is cut at the end side of the residual unnecessary pipe separated from the conduit line. The end side of the unnecessary pipe is exposed and opened in the pit, and a core wire material such as a wire or a rod having a required tensile strength is vertically penetrated into the pipe to be removed through the opening, The pipe is filled with a resin having adhesiveness between the core wire and the pipe body, an injection material such as mortar, and cured,
A method for removing a buried pipe, characterized in that after the hardening, the end of the unnecessary pipe is clamped by a pulling device installed in the pit and pulled out. 2. The method for removing a buried pipe according to claim 1, wherein the residual unnecessary pipe to be removed is a lead pipe. 3. The adhesion between the core wire and the pipe body by the injection material is performed by partially adhering at least a required region of the cut-off end on the side opposite to the drawing direction (conduit path side) to the unnecessary pipe to be removed. The method for removing a buried pipe according to claim 1 or 2, wherein 4. A passage forming hose for injecting a filler such as mortar into a hollow hole formed by drawing is vertically inserted into the unnecessary pipe to be removed in parallel with the core wire. After that, the injection material is filled and hardened, one end of the passage forming hose is connected to the supply source of the filling material, and the other end is open to the side opposite to the drawing direction. At the same time, in conjunction with this, the filler is supplied to the hose, and the filling is performed in the cavity hole created by the withdrawal at the same time as the withdrawing operation. Or the method for removing the buried pipe according to 2 or 3.