JP3314391B2 - How to treat unused gas pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating unused gas pipes for safely treating gas supply pipes that have become unused after burial without removing them.

[0002]

2. Description of the Related Art A gas supply pipe branched from a gas main pipe, a branch pipe, or the like may not be used for a long time due to a change in usage after burial, a change in land use law, and the like. Leaving an unused gas supply pipe as it is may corrode and cause gas leakage. In addition, there is a possibility that a gas leak accident may occur due to accidental excavation due to other civil works such as water works. Therefore, conventionally, the gas supply pipe which has not been used has been excavated or cut off the branch portion.

[0003] However, even if the unused gas supply pipe is excavated and removed, the permission of the landowner may not be obtained, and the excavation may not be possible. Also, even if excavation is possible, the construction will be large. In addition, even if an excavation permit is obtained, if any building or structure is made on the buried pipe, excavation cannot be performed and removal may not be possible. Further, when the branch portion is cut off, there is no risk of gas leakage due to the cutoff, but there is a possibility that the ground may be subsided due to corrosion in a relatively large-diameter pipe. Moreover, even if the ground subsidence is small, there is a possibility that the structure formed on the upper surface may be damaged such as cracks. In addition, when it is excavated by another civil engineering work, it is unknown that the gas pipe is unused, so an inquiry to the gas company occurs,
During this time, problems such as the need to suspend the work arise.

[0004] Conventionally, as a method of solving these problems and safely processing the unused gas supply pipe without removing it, a gas supply port of an unused gas supply pipe is excavated.
This gas supply pipe is separated from the gas supply pipe main body, and the liquid supply pipe is connected to the cutout port via a joint as appropriate, and then a depressurizing thin tube is inserted into the liquid supply pipe, and the tip of the gas supply pipe becomes unused. To the distal end of the gas supply pipe, and connect one end of the decompression capillary to a decompression pump to reduce the pressure in the unused gas supply pipe. There has been proposed a method for treating an unused gas supply pipe, which comprises introducing a curing agent, filling the curing agent in the unused gas supply pipe, and curing the unused gas supply pipe.
-113185). According to this method, the curable liquid resin can be introduced into the gas supply pipe extending in the direction of the private road from the pit provided on the public road, and the gas supply pipe can be safely processed without removing the gas supply pipe.

[0005]

However, in the processing method of the unused gas supply pipe according to the above-mentioned Japanese Patent Application Laid-Open No. 3-113185, although it is not necessary to remove the buried pipe,
There is a problem that it is necessary to provide a work pit at the branch pipe position on the public road side, and the work position is limited to the public road side, so that it may be difficult to work due to circumstances such as traffic volume.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for injecting a curable liquid resin from the end of a pipe and safely processing the unused gas pipe without removing the pipe so that the work can be started from the rising end of the ground. And

[0007]

The present invention for solving the above-mentioned problems is a method for treating an unused gas pipe as described in the claims. As the flexible wire, a stranded wire made of steel, a flexible wire made of resin, or the like can be used. Examples of the small ball that expands after a certain time include a rubber ball in which a foamed resin is sealed.

[0008]

In the method for treating an unused gas pipe according to the present invention, a wire rod with small balls is inserted from the rising end of the unused gas supply pipe above the ground, and the gas supply pipe is closed by expansion of the small balls. Thereafter, a curable liquid resin can be injected from the above-mentioned rising edge. In order to inject the liquid resin from the other end into the gas supply pipe one end of which is closed by the expansion of the small ball, the liquid resin is discharged from the tip of the thin tube attached to the wire, or the inside of the tube is formed by the thin tube. , And the liquid resin is directly injected from the open end.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an occurrence state of an unused gas pipe to which the present invention is applied.

In FIG. 1, a gas supply pipe 4 extending from a branch pipe 2 buried in a public land 1 to a private land 3 is buried, and is set up at a customer point in the private land 3. A socket 5 with a plug 5P is screwed into the rising end. This plug 5
P is removed when a customer house is completed in the vicinity, and the gas supply pipe 4 is joined to the customer equipment. However, the gas supply pipe 4 buried in this way is
After burial, due to changes in usage, changes in land use law, etc.,
It may be unused for a long time. This is the generation of unused gas pipes.

FIG. 2 is an explanatory view showing parts required for carrying out the present invention. All the processing work is performed on the private land 3 side. As for each part, reference numeral 6 denotes a pack in which a two-component foamed polyurethane resin is separated and packaged in two components (the present agent and a curing agent). The pack 6 is separated into two liquids by a partition member 7 at an intermediate portion thereof. The partition member can be removed, and both liquids can be mixed and mixed. The pack 6 is provided with a nozzle 8 that can discharge the foamed resin after mixing by cutting off the tip. The pot life after mixing is 30 to 60 minutes, and the resin after mixing is 30 to 60 minutes.
After 60 minutes, it expands rapidly, and its volume becomes 3 to 4 times.

9 is a flexible wire (shaft) formed by winding a Teflon thin tube 10 having a diameter of about 2 mm.
Then, a shaft rotation assisting tool 11 and a connecting member 12 are inserted from one side thereof, and a rubber ball 13 having a smaller diameter than that of the rubber ball 13 is joined to the end of the supporting tool 11 in accordance with the size of the gas supply pipe. The diameter of the rubber ball 13 is 50 to the inner diameter of the tube.
It is preferred to use 89%. The distal end of the shaft 9 has a length of 30 to 43 in order to completely insert the tube 4 through the curved portion.
° is bent. Details of the connection member 12 will be described with reference to FIG. By supporting both ends of the assisting tool 11 with both hands and rotating one end, the shaft 9 with the rubber balls 13 can be rotated and advanced into the tube 4 while rotating. Since the tip of 9 is bent by about 30 to 43 °, the shaft 9 can pass through the curved pipe part well. Reference numeral 10 denotes a thin tube wound along the entire length of the shaft. The operation of the thin tube 10 will be described later.

FIG. 3 shows the nozzle 8 of the pack 6 after mixing the two liquids.
FIG. 4 is an explanatory diagram showing a state in which a liquid is inserted into a hole of a rubber ball 13 and a mixed liquid is filled in the rubber ball 13. FIG. 4 shows pack 6
FIG. 4 is an explanatory view showing a state in which after mixing the mixed solution into the rubber ball 13, the tip of the shaft 9 is inserted into the hole of the rubber ball 13, and the tightening band 14 is provided around the hole. FIG. 5 is an explanatory diagram showing a state in which the socket 5 and the connection member 12 provided on the shaft 9 are connected with the plug 5P of the socket 5 of the gas supply pipe 4 removed.

The operation of connecting the connection member 12 to the socket 5 is performed after the rubber ball 13 is filled with the two-liquid mixture.
The connecting member 12 is composed of a modified cheese 13 and plugs 15-1, 15-2, 15-3 screwed to both ends and a different diameter portion. A small hole for inserting the shaft 9 to which the thin tube 10 is attached is provided. Plug 15-3 screwed to the different diameter part
Is a filling 1 inside the cheese 13 for gas leakage mitigation.
6 is to be enclosed. By screwing the other end of the plug 15-2 into the socket 5P, the gas supply pipe 4 and the joining member 12 are connected.

Then, the rubber ball 13 can be sent into the pipe by pushing the shaft 9 into the gas supply pipe 4. Further, when the rubber ball 13 collides with the curved tube portion, the shaft 9 is rotated by rotating the auxiliary tool 11 so that the rubber ball 13 can pass through the curved tube portion.

FIG. 6 is an explanatory view showing a state in which the rubber ball 13 attached to the tip of the shaft 9 has reached the branch portion 17 of the branch pipe 2. Whether or not the rubber ball 13 has reached the branch portion 17 is measured by comparing the feed amount of the shaft 9 with the buried distance of the gas supply pipe 4 estimated from the drawing, or by using, for example, a sonic length measuring device. It can be estimated by comparing the lengths of the gas pipes. The position of the rubber ball 13 is preferably located as close to the branch pipe 2 as possible. When the rubber ball 13 is inserted into the gas supply pipe 4 and reaches the branch portion 17, the remaining portion of the shaft 9 is cut off and connected to the nozzle 19 of the tank 18 shown in FIG. The tank 18 is fixed to a stand 20, and its height is adjustable. After that, it waits for foaming of the resin sealed in the rubber ball 13. The waiting time varies from the time required for foaming the resin (30 to 60 minutes) to the work time (1
0 to 15 minutes) (15 to 50 minutes). When the resin in the rubber ball 13 foams, the rubber ball 13 expands and closes the gas supply pipe 4. This condition can be seen from the fact that rare gas leakage through the packing 16 shown in FIG. 5 becomes zero. Alternatively, when the shaft 9 is pushed or pulled, the resistance is sharply increased, so that it can be understood.

After completing the above preparation work, the tank 1
8 low viscosity adjusted to a pot life of 30 to 120 minutes (5
0-500 cps) of curable liquid resin,
The liquid resin can be injected into the gas supply pipe 4 through the gas supply pipe 4. Pressure may be applied to tank 18 to facilitate infusion. After the pouring is completed, the entire work is completed after the curable liquid resin is cured. As described above, the buried gas supply pipe 4 is filled with the cured resin over substantially the entire length.

In the above embodiment, the liquid resin is injected from the branch portion 17 side through the thin tube 10, but it is also possible to evacuate the thin tube 10 and inject the liquid resin directly from the opening side.

In the above-described embodiment, the thin tube 10 is wound around the shaft 9 and disposed. However, the shaft 9 itself may be formed of a tube material, and a portion between the holes may be used as the thin tube. .

The present invention is not limited to the above-described embodiment, but can be embodied in appropriate modes by making appropriate design changes.

[0021]

As described above, since the present invention is a method for treating an unused gas pipe as described in the claims, the small gas pipe inserted from the rising end of the unused gas supply pipe is used. The gas supply is cut off by the expansion of the sphere, and the curable liquid resin can be injected from the rising end side using a thin tube as appropriate, and after the liquid resin is cured, the unused gas pipe is filled with the resin cured material. Thus, it is possible to easily, safely and surely treat the unused gas supply pipe without excavating the pipe.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a buried state of an unused gas pipe to which the present invention is applied.

FIG. 2 is an explanatory view showing components necessary for implementing the present invention.

FIG. 3 is an explanatory view showing an operation of packing a foamed resin into a rubber ball fixed to a tip of a shaft.

FIG. 4 is an explanatory view showing a state in which a rubber ball is filled with a foamed resin and plugged.

FIG. 5 is an explanatory sectional view showing a state where a shaft with a rubber ball is inserted from a rising end of an unused gas pipe.

FIG. 6 is an explanatory view showing a state in which a rubber ball has arrived at a branch pipe branch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Public land 2 Branch pipe 3 Private land 4 Gas supply pipe 6 Pack 9 Shaft 10 Thin tube 13 Rubber ball 17 Branch part 21 Curable liquid resin

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 1/024

Claims (2)

(57) [Claims] 1. A method for safely treating an unused gas supply pipe without removing it, comprising: expanding a wire which can be inserted into a pipe after a predetermined time to increase its volume. Attach a small ball that can be attached, insert the wire to which the small ball is attached from the opening at the rising end of the gas supply pipe above the ground, and wait a certain time after the small ball arrives near the main pipe or branch pipe. Waiting for the small balls to expand, shut off the gas supply to the gas supply pipe, and then introduce the curable liquid resin through the opening of the above-ground rising end of the gas supply pipe, Filling the inside of the gas supply pipe with a cured product of the liquid resin by curing of the non-use gas pipe, wherein the curable liquid resin is opened through an opening of the above ground rising end. Those who introduce The treatment of an unused gas pipe is characterized in that the curable liquid resin is injected from the small ball side to the opening portion through a thin tube integrally provided in the flexible wire rod. Method. 2. A method for safely treating an unused gas supply pipe without removing it, comprising: expanding a tip of a wire rod that can be inserted into a pipe after a predetermined time to increase its volume. Attach a small ball that can be attached, insert the wire to which the small ball is attached from the opening at the rising end of the gas supply pipe above the ground, and wait a certain time after the small ball arrives near the main pipe or branch pipe. Waiting for the small balls to expand, shut off the gas supply to the gas supply pipe, and then introduce the curable liquid resin through the opening of the above-ground rising end of the gas supply pipe, Filling the inside of the gas supply pipe with a cured product of the liquid resin by curing of the non-use gas pipe, wherein the curable liquid resin is opened through an opening of the above ground rising end. Those who introduce In the formula, the air inside the gas supply pipe is drawn through a thin tube integrally provided with the wire, and the curable liquid resin is directly injected from an opening at the rising end on the ground. A method for treating unused gas pipes.