JPH049107B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing leakage of a pipe joint for preventing fluid from leaking from a pipe joint of a pipe that conducts a fluid such as gas.

For example, in pipe joints for underground pipes and pipes that are embedded or hidden within building walls, a sealant such as yarn is used to achieve sealing properties. This yarn develops fluid leakage with prolonged use. Conventionally, to prevent fluid leakage from pipe fittings, the pipe fittings are disassembled and the yarn replaced, or the yarn is swollen with glycol liquid, reused, and the pipe fitting is reassembled. . Such prior art requires a lot of effort to prevent leakage, and especially when there are a large number of pipe joints, it requires a lot of manpower and time.

An object of the present invention is to provide a method that can completely prevent fluid leakage from a pipe joint using a sealant such as yarn.

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. An in-pipe wire passing tool is used, which is wound in a shape and can be bent by the weight of the guiding member, and has a bending rigidity and radius smaller than that of the main wire, and the guiding member has at least a front surface,
An injection hole is formed so that the tip thereof widens toward the axis, and a flexible tube having a bending rigidity smaller than that of the auxiliary wire is inserted into the main wire and the auxiliary wire.
One end of the flexible tube is connected to the injection hole, an in-pipe wire feeder is inserted into the tube having a pipe joint to prevent leakage, and a leakage prevention liquid is pumped from the other end of the flexible tube. This method of preventing leakage of pipe joints is characterized in that a leakage prevention liquid is sprayed inside the pipe where leakage of the pipe joint is to be prevented, and the leakage prevention liquid swells the sealant of the pipe joint from the inside of the pipe.

FIG. 1 shows an in-pipe wire passing device 20 according to an embodiment of the present invention.
FIG. The main wire 1 has relatively high bending rigidity and is made of, for example, piano wire, which is wound in a spiral shape, and may have a length of 20 m or more in its natural state. good. The end of the auxiliary wire 2 is fixed to the end of the main wire 1. A guiding member 3 is fixed to the other end of the auxiliary wire 2 . The auxiliary wire rod 2 can be bent by the weight of the guide member 3, and has lower bending rigidity and radius than 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 is
For example, it may be around 10 cm.

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

FIG. 2 is a perspective view of the vicinity of the guide member 3. This 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 of the guide member 3 is tapered 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, it can rotate and vibrate due to 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, 61
is communicated with the communication hole 55. The communication hole 55 is a connection hole 57 that opens in the rear end surface 56 of the guide member 3a.
, 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 valve 12, an elbow 11, a pipe joint 10, 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. 4 shows the state in which the pipe wire passing tool enters the chi 6 from the lead-in pipe 7. The auxiliary wire 2 is deflected by the gravity of the guide member 3, so that the guide member 3 is easily allowed to advance from the chi 6 into the tube 5. When the auxiliary wire 2 hangs down due to the gravity of the guide member 3, by pushing the main wire 1 while rotating the main wire 1 around its axis, the guide member 3 rotates and vibrates. Tsutsu tube 5
can enter inside.

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 threaded through various gas pipes using the pipe wire threading tool 20 of the illustrated embodiment, wire threading could be carried out with a probability of approximately 92 to 93%, and the wire threading was successful. It was confirmed that the rate was extremely high, and the time required to run the line was relatively short.

The in-pipe wiring device according to the present invention is capable of passing not only underground gas pipes, but also pipes installed in other building walls, other sealed areas, or exposed pipes. Good too.

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 cross-sectional view for explaining leakage prevention work of a pipe joint according to an embodiment of the present invention. ground 62
Pipes 63 and 64 for transporting fluid such as gas are buried in the pipes 63 and 64, and these pipes 63 and 64 are connected by a pipe joint 65. In the pipe joint 65, the ends of the pipes 63 and 64 are partially inserted into both ends of the joint body 66, and yarn 67 and lead 68 are interposed on their outer peripheries, and the pipe shafts are held together by a push ring 69. Pushed inward, airtightness is achieved.

After long-term use, the yarn 67 dries out, causing gas leakage. At this time, the tube wire passing device 20 according to the present invention is inserted into the tube 63, and a leak prevention liquid such as glycol liquid is supplied under pressure to the flexible tube 51 from the supply device 70. As a result, the leakage prevention liquid is sprayed in a gaseous state from the injection hole 53 of the guide member 3, and is scattered over a relatively long distance. The yarns 67 are therefore swollen and airtightness is achieved. The leading end surface of the guiding member 3 is square, and therefore catches on the step at the pipe joint 65. The operator who is pushing the main wire 1 into the tube 63 can feel the feeling when it is caught. Therefore, it is predicted that the guiding member 3 is located at the pipe joint 65. By spraying the leakage prevention liquid while the guide member 3 is located at the pipe joint 65, it is easily possible to reliably prevent leakage from the pipe joint 65 with a small flow rate.

By using the guide member 3a shown in FIGS. 4 and 5 described above, the leak prevention liquid can be easily sprayed in the vicinity of the pipe joint 65, thereby preventing leakage of the pipe joint 65. This can definitely be achieved.

Injection holes 53, 58, 5 are provided in the guiding members 3, 3a.
9, 60, and 61 are formed, it is possible to inject the leakage prevention liquid in a desired direction.

As described above, according to the present invention, a flexible pipe is introduced into a pipe having a pipe joint to be repaired using an in-pipe wire passing tool, and a leak prevention liquid is injected from near the tip of the flexible pipe. Therefore, without disassembling the pipe joint to be repaired, it becomes possible to swell the sealant such as yarn used in the pipe joint and easily prevent fluid leakage. In addition, the in-pipe wire passing device is constructed by a guiding member connected to the tip of a longitudinal member having bending rigidity, and the leakage prevention liquid is pumped and supplied through a flexible tube to the injection hole formed in the guiding member. It becomes possible to reliably inject the leakage prevention liquid to a desired pipe joint in the pipe while the liquid is being injected.

[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 guide member 3a, 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. 8 is a sectional view illustrating the wire state, FIG. 8 is a sectional view illustrating the operation of passing the wire through the pipes 14 and 16, and FIG. 9 is a sectional view illustrating the leakage prevention work of the pipe joint 65. 1...Main wire rod, 2...Auxiliary wire rod, 3, 3a...
Guidance member, 20... In-pipe wire passing tool, 51... Flexible tube, 53, 58, 59, 60, 61... Injection hole,
55...Aisle.

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. The method uses an in-tube wire threading device that is spirally wound, can be bent by the weight of the guiding member, and has a bending rigidity and radius smaller than that of the main wire, and the guiding member has at least the front surface, The injection hole is formed so that the tip widens toward the axis, and a flexible tube having 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. Insert the in-pipe wiring fitting into the pipe that has the pipe fitting that should prevent leakage, and force-feed the leak-prevention liquid from the other end of the flexible tube into the pipe that should prevent leakage from the pipe fitting. A method for preventing leakage of a pipe joint, which comprises spraying a leakage prevention liquid and causing the leakage prevention liquid to swell a sealant of the pipe joint from the inside of the pipe.