JPH0362957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for airtightly closing a pipe in the middle of which a fluid, such as a gas, is conducted.

When repairing a pipe that transports fluid, it is necessary to shut off the fluid being transported by the pipe. For this reason, it is necessary to provide valves at intervals along the pipe. In this case, valves must be prepared and piping work becomes complicated.

SUMMARY OF THE INVENTION An object of the present invention is to propose a method for closing a pipe by simply blocking the flow of fluid in the middle of the pipe.

In the present invention, a guiding member having a rectangular front end shape is connected to an end of a main wire that is spirally wound and has relatively high bending rigidity via an auxiliary wire, and the auxiliary wire has a spiral shape. Using an in-pipe wire passing tool that is wound in a shape, can be bent by the weight of the guiding member, and has a bending rigidity smaller than that of the main wire,
An injection hole is formed in the guiding member of this intra-tube wire passing device, and a flexible tube having bending rigidity smaller than that of the auxiliary wire is inserted into the main wire and the auxiliary wire. The tube is connected to the hole, and the pipe liner is inserted into the pipe where leakage is to be prevented. A foaming agent is force-fed from the other end of the flexible tube, and the pipe is closed with the foaming agent. This is a method for closing pipes.

FIG. 1 is a sectional view of an intraductal wire passing device 20 used in the present invention. The main wire 1 has relatively low bending rigidity, is made of piano wire, etc., and is configured by winding the piano wire in a spiral shape, and may have a length of 20 m or more in its natural state. . The end of the auxiliary wire 2 is fixed to the end of the main wire 1. A guiding member 3 is attached to the other end of the auxiliary wire 2.
is fixed. The auxiliary wire rod 2 can be bent by the weight of the guide member 3 and has a bending rigidity greater than that of the main wire rod 1. The auxiliary wire 2 is also made of piano wire or the like, and is wound spirally. The length of this auxiliary wire 2 may be, for example, about 10 cm. The auxiliary wire 2 has an outer diameter D of the main wire 1.
It is wound spirally with an outer diameter D2 smaller than 1.

The flexible tube 51 is inserted along and through the main wire 1 and the auxiliary wire 2. This flexible tube 51 has bending rigidity that is sufficiently smaller than the bending rigidity of the main wire 1 and the auxiliary wire 2. flexible tube 5
1 end 52 is connected to the guiding member 3.

FIG. 2 is a perspective view of the vicinity of the guide member 3. The guide member 3 has a square surface 4 when viewed from the free end side (left side in FIG. 2), that is, from the front, and is partially formed into a prismatic shape. The proximal end 21 of the guiding member 3 has a tapered shape and is fixed to the auxiliary member 2 as described above. This guide member 3 is made of a material such as steel. By applying a rotational force to the main wire 1, torsional stress is accumulated in the pipe, and when the load falls below a certain level, the main wire 1 can rotate and vibrate due to the reaction, and can withstand reuse.

FIG. 3 is an enlarged sectional view of the vicinity of the guide member 3. A trumpet-shaped injection hole 53 is formed facing the distal end surface 4 of the guiding member 3. A base end 54 of the injection hole 53 communicates with a passage 55 . The passage 55 is
It extends toward the rear end portion 56 of the guide member 3 . aisle 5
The connecting hole 57 facing the rear end portion 56 of the flexible tube 51
is connected to the end 52 of.

FIG. 4 is a longitudinal cross-sectional view of a guide member 3a according to another embodiment of the present invention, and FIG.
FIG. The guide member 3a is formed with a trumpet-shaped injection hole 53 facing the distal end surface 4 thereof, and trumpet-shaped injection holes 58, 59, 60, and 61 are formed in each of the remaining four peripheral walls. These injection holes 53, 58, 59, 60, 6
1 communicates with the communication hole 55. Communication hole 55
is a connecting hole 5 opened in the rear end surface 56 of the guiding member 3a.
At 7, it is connected to the end 52 of the flexible tube 51.

Referring to FIG. 6, a chi 6 is connected to the upper part of the underground pipe 5. An above-ground standpipe 8 is connected to this chi 6 from a service pipe 7, and gas is supplied to a house 9. These lead pipes 7 and stand pipes 8 include
A pipe joint 10, an elbow 11, a valve 12, etc. are interposed. According to the pipe wire passing tool 20 according to the present invention, the guide member 3 can enter the pipe 5 from the standpipe 8 through the lead-in pipe 7.

FIG. 7 shows the state in which the pipe wire passing tool 20 enters the chi 6 from the lead-in pipe 7. Auxiliary wire 2
is deflected by the gravity of the guiding member 3, so that the guiding member 3 is easily allowed to advance from the chi 6 into the tube 5. When the auxiliary wire rod 2 hangs down due to the gravity of the guide member 3, by pushing the main wire rod 1 while rotating the main wire rod 1 around its axis, the guide member 3 rotates and vibrates. can enter into the tube 5.

Further, as shown in FIG. 8, the end of the tube 14 is closed with a plug 15.
Even when the branched pipe 16 is connected to the vicinity of the pipe 5, the intra-pipe wire passing device 20 according to the present invention can be introduced from the pipe 14 to the pipe 16 as shown by the arrow 17, and vice versa. From tube 16, tube 14 can be entered as indicated by arrow 18.

The free end surface 4 of the guiding member 3 is square, and therefore, the corner portion 4a of the free end surface 4 is likely to get caught in a step at an elbow, a tee, a pipe joint, etc. When this corner portion 4a hits a step inside the pipe, it jumps due to the elastic force of the auxiliary wire 2 and the main wire 1. This allows the guide member 3 to enter the pipe while overcoming the step.

According to experiments conducted by the inventor of the present invention, when wires were passed through various gas pipes using the in-pipe wire threading device 20 of the illustrated embodiment, the wires could be threaded with approximately 92 to 93% probability. It was confirmed that the success rate was extremely high, and the time required to install the line was relatively short.

The pipe passage device according to the present invention is capable of passing not only underground gas pipes, but also pipes installed in other building walls, other hidden parts, or exposed pipes. It's okay.

As another embodiment of the present invention, the main wire 1 may be constituted by a coil spring having an inner and outer double structure wound in opposite directions.

FIG. 9 is a sectional view for explaining the closing operation of an embodiment of the present invention. A pipe 63 for transporting fluid such as gas is buried in the ground 62. tube 63
To close the tube, the tube wire passing tool 20 is inserted into the tube 63 together with the flexible tube 51.

When the guide member 3 of the pipe wire passing device 20 reaches the position where the pipe 63 is to be closed, a foaming agent is supplied to the end 72 of the flexible pipe 51 from a foaming agent supply device 70 provided on the ground. As a result, the foaming agent is injected from the injection hole 53 formed in the guiding member 3, and when it flows from the foaming agent supply device 70 through the flexible tube 51, it is in a liquid state and flows from the injection hole 53 into the tube 63. Foams when sprayed. This blowing agent has the reference number 71
Close the tube 63 as shown.

The free end surface 4 of the guiding member 3 is rectangular, so that the corner portion 4a of the free end surface 4 of the guiding member 3
When inserted into the tube, its corners come into contact with the inner circumferential surface of the tube 63 and sound is emitted. This sound is
Microphone 64 provided on the ground 62
a microphone 64 that can be detected by
is covered by the rubber 65 to prevent noise emitted from the ground from entering the microphone 64. The signal from microphone 64 is amplified by amplifier 66 and can be heard by speaker 67. In this way, the tube 6 of the guiding member 3
3 can be known on the ground 62.

The free end 4 of the guiding member 3 is square. Therefore, if a pipe joint is interposed in the pipe 63 or the like and there is a step near the pipe joint, the corner portion 4a of the guiding member will hit the step. The operator who is pushing the main wire 1 into the tube 63 can feel this tightening sensation. Therefore, it is predicted that the guiding member 3 is located at the pipe joint. When repairing a pipe joint, the foaming agent is supplied while the guide member 3 is located upstream of the fluid from the pipe joint. It is thus possible to close the pipe 63 upstream of the pipe joint to be repaired.

To unblock the pipe 63, an antifoaming agent is supplied from the ground through the flexible pipe 51.
As a result, the antifoaming agent reacts with the foaming agent 70 to vaporize or liquefy the foaming agent, and the closed state of the pipe 63 is released.

According to the invention, it can be implemented not only for closing pipes in connection with pipes transporting gases, but also for closing pipes transporting liquids.

As a foaming agent, for example, there is a protein made by hydrolyzing cow's hoof (main component keratin) with alkali and mixing the stock solution at 3% and water at a ratio of 97%.

Examples of antifoaming agents that vaporize or liquefy the foaming agent by reacting with the foaming agent include polyether polymer compounds (alkylene oxide block copolymers).

As described above, according to the present invention, it is possible to introduce a flexible tube into the tube using an intra-pipe wire feeder, supply a foaming agent to the flexible tube, and close the tube. It becomes possible to close the pipe by operation. Therefore, there is no need to interpose a valve or the like in the pipe, and there is no need to perform valve piping work, which is advantageous. Furthermore, by using the pipe wire passing tool of the present invention, the catch in the pipe can be released by the spring force of the main wire rod and the auxiliary wire rod, or by the reaction of the guiding member due to the spring force. It can enter the pipe smoothly. The auxiliary wire can be bent by the weight of the guide member, and therefore can easily enter the pipe.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a perspective view of the vicinity of the guiding member 3, FIG. 3 is a sectional view of the vicinity of the guiding member 3, and FIG. 4 is a sectional view of another embodiment of the present invention. 5 is a sectional view of the vicinity of the guiding member 3, FIG. 5 is a sectional view taken from the cutting plane line - in FIG. 4, FIG. 6 is a piping diagram for explaining the wiring work, and FIG. FIG. 7 is a cross-sectional view showing the wire passing state near the chi 6, and FIG. 9 is a cross-sectional view explaining the closing operation of the pipe 63. 1...Main wire rod, 2...Auxiliary wire rod, 3,30...
Guidance member, 20... In-pipe wire passing tool, 51... Flexible tube, 63... Tube, 70... Foaming agent.

Claims (1)

[Scope of Claims] 1. A guiding member having a rectangular front end shape is connected to an end of a main wire that is spirally wound and has relatively high bending rigidity via an auxiliary wire, and the auxiliary wire has a rectangular front shape. This method uses a pipe wire threading device that is spirally wound, can be bent by the weight of the guiding member, and has a bending rigidity smaller than that of the main wire material, and the guiding member of this pipe wire threading member has an injection hole. A flexible tube having a bending rigidity smaller than that of the auxiliary wire is inserted into the main wire and the auxiliary wire, and one end of the flexible tube is connected to the injection hole to prevent leakage. 1. A method for closing a tube, which comprises: inserting the flexible tube into the tube to be prevented, force-feeding a foaming agent from the other end of the flexible tube, and closing the tube with the foaming agent.