JPH0362959B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing fluid leakage in pipes conducting or storing fluids, such as gases.

For example, pipes buried underground that conduct fluid may leak due to long-term use. Conventionally, when a fluid leak occurs, a shaft is excavated to expose the pipe and repaired. Such prior art requires a lot of effort to prevent leakage, and especially when there are many leakage points, it takes a lot of people and time.

An object of the present invention is to provide a method that can prevent pipe leakage with simple operations.

The present invention connects a guiding member having a rectangular front end shape via an auxiliary wire to an end of a main wire that is spirally wound and has relatively high bending rigidity, and the auxiliary wire has a spiral shape. using an in-pipe wire threading tool that is wound around the main wire, 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. Connected to the hole, insert the pipe liner into the pipe where leakage is to be prevented, force the leakage prevention liquid from the other end of the flexible tube, and spray the leakage prevention liquid inside the pipe where leakage should be prevented. This fluid leakage prevention method is characterized in that this leakage prevention liquid adheres to the inner surface of the tube to form an airtight thin film.

FIG. 1 is a sectional view of an intraductal wire passing device 20 used in one embodiment of the present invention. The main wire 1 is
It has relatively low bending rigidity, is made of piano wire, etc., is wound spirally, 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 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 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 is spirally wound with an outer diameter D2 smaller than the outer diameter D1 of the main wire 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. 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 shows a guide member 3a according to another embodiment of the present invention.
FIG. 5 is a longitudinal cross-sectional view of FIG.
It is a sectional view seen from -V. The guiding member 3a includes
A trumpet-shaped injection hole 53 facing the tip surface 4 is formed, 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. 7 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 into pipes of various configurations using the pipe wire threading tool 20 of the illustrated embodiment, 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 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 parts, 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 according to an embodiment of the present invention. Pipes 63 and 64 for transporting fluids such as gas are buried in the ground 62, and these pipes 63 and 64 are connected by pipe fittings 65.
64 are connected. In the pipe fitting 65, the fitting body 6
The ends of tubes 63 and 64 are partially inserted into both ends of tube 6, and yarn 67 and lead 68 are interposed on their outer peripheries, and are pushed into the tube shaft inward by a press ring 69 to create an airtight seal. sex is achieved.

After long-term use, the yarn 67 dries out, causing gas leakage. At this time, the pipe wire passing tool 20 according to the present invention is introduced into the pipe 63, and the end 7 of the flexible pipe 51 is inserted into the pipe 63.
2, leakage prevention liquid is supplied under pressure from a supply source 73. As a result, the leakage prevention liquid is sprayed in the form of fine particles from the injection hole 53 of the guiding member 3, and is sprayed into the pipe 6.
3, 64 and the entire inner wall of the pipe joint 65 to form an airtight thin film 70. This thin film 70 is formed continuously in the tube axial direction over the inner walls of the tube 63, the tube fitting 65, and the tube 64. Therefore, tube 6
3, 64 and the space between the pipe joint 65 become airtight,
Leakage at the pipe joint 65 is prevented.

The distal end surface of the guiding member 3 is square, so that when the in-pipe wire passing tool 20 is advanced from inside the pipe 63 toward the pipe fitting 65 prior to leakage prevention work, the guiding member 3 is connected to the pipe fitting 65. I hit a step in the middle. 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 65 on the ground. This guiding member 3 is a pipe joint 65
By spraying leak prevention liquid when it is found that there is
It becomes possible to reliably prevent leakage of No. 5. By using the guide members 3, 3a shown in FIGS. 4 and 5 described above, it is easy to uniformly spray the leak prevention liquid into the pipes 63, 64 and the pipe fitting 65. can, pipe fitting 6
Leakage prevention around 5 can be reliably 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.
From the injection hole 53, the leakage prevention liquid can be injected forward. In addition, the injection holes 58, 59,
60, 61 serve to inject the anti-leakage liquid radially outward towards the inner peripheral surface of the tube.

An example of such a leakage prevention liquid is polyethylene vinyl acetate.

As described above, according to the present invention, a leak prevention liquid is sprayed inside a pipe or a container where leakage is to be prevented,
This leak-prevention liquid adheres to the entire inner wall of pipes and containers, forming an airtight thin film, so there is no need to disassemble the part of the pipe that needs repair, making it possible to easily prevent fluid leaks. .

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 guide member 3a, FIG. 5 is a sectional view taken from the section line V-V 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 passing operation to 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...passage, 70...thin film.

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 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. Insert the leakage prevention liquid into the pipe to be prevented, and force-feed the leakage prevention liquid from the other end of the flexible pipe.
A fluid leakage prevention method characterized by spraying a leakage prevention liquid inside a pipe where leakage is to be prevented, and causing the leakage prevention liquid to adhere to the inner surface of the pipe to form an airtight thin film.