JPH0367234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for inserting a wire running tool into an underground pipe or a pipe buried or hidden in the wall of a building to determine the direction of extension of the pipe and the direction of the wire running tool inside the pipe. This invention relates to a novel tube detection method for determining the direction of entry.

For example, underground pipes that transport gas fuel are
It is intricately branched underground. Therefore, it is difficult to accurately determine the buried position of the pipe on the ground surface. Therefore, it is difficult to accurately drill a vertical hole to expose a portion of the pipe for the purpose of repairing the pipe.

An object of the present invention is to provide a tube detection method that can detect the extending direction of such a tube.

So-called in-pipe wire passing devices are used as a measure to prevent gas leakage from pipe joints, such as by spraying glycol liquid into the pipe, sandblasting, and other various pipe construction work, or by preventing gas from entering the pipe due to damage. During pipe construction, a balloon-shaped bag is placed inside the pipe and compressed gas is supplied to the bag to inflate it and shut off the inside of the pipe, or an AC oscillator is introduced into the pipe to check the situation inside the pipe. Diagnose the position and corrosion status of pipe joints based on the state of eddy currents generated in the pipes, heat removal of branch pipe connection port lining layers that were unexpectedly measured during inner lining construction by placing a heater inside the pipes, etc. For this purpose, liquid inlet tubes, liquid drain tubes, oscillators, banks, fiberscopes, heaters and other tube inserts are required to be introduced into the conduit.

However, underground pipes that transport gas fuel are
As mentioned above, it branches underground. Therefore, it is necessary to insert the pipe-intraducting device into the target pipe. Conventionally, it has not been possible to know the direction in which the wire passing device enters the pipe. In addition, it was not possible to determine the position of the tip of the in-tube wire threading tool.

Another object of the present invention is to provide a tube detection method that makes it possible to know the direction of entry and the position of the tip of an intra-tube wire passing device into the tube.

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 threading 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, the in-pipe wire threading tool is inserted into the pipe, and the wire is inserted from outside the pipe. This is a tube detection method characterized by detecting sound.

FIG. 1 is a front view of a wire threading tool 20 according to an embodiment of the present invention. The main wire 1 has relatively high bending rigidity and is made of piano wire, etc., which is wound spirally, and is 20m long in its natural state.
Alternatively, it may have a longer length. 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 smaller 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.

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 square 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 stored 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.

Referring to FIG. 3, in the upper part of the underground pipe 5,
A chie 6 is connected to the chie 6, and an above-ground standpipe 8 is connected from a service pipe 7 to the chie 6, and gas is supplied to the house 9. These lead pipes 7 and stand pipes 8 include
Although the pipe fitting 10, the elbow 11, the valve 12, etc. are interposed, according to the in-pipe wire passage device 20 according to the present invention, the guide member 3 enters the pipe 5 from the standpipe 8 via the lead-in pipe 7. I can go.

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 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. 5, the end of the tube 14 is protected by 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 tube, 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 of the illustrated embodiment, the wire threading could be carried out with a probability of approximately 92 to 93%, and the success rate was approximately 92% to 93%. It was confirmed that the amount of time required to run the line was extremely high, and the time required to run the line was relatively short.

The illustrated in-pipe wiring device 20 according to the present invention is capable of passing not only underground gas pipes, but also pipes installed in other building walls and other sealed areas.
Alternatively, it may also be an exposed tube.

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. The intraductal wire passing tool 20 only needs to have a guiding member whose front end has a rectangular shape, and the remaining configuration can be changed.

Referring to FIG. 6, a pipe wire passing device 20 according to the present invention
is a pipe 21 that transports gas fuel buried underground
It is entering inside. A microphone 23 is provided at the ground surface 22, and the microphone 23 is installed at the ground surface 22 for sound insulation.
3 is covered with a cover 24 made of a material such as rubber. The acoustic signal from the microphone 23 is amplified by the amplifier circuit 25 and turned into sound by the speaker 26. The free end surface 4 of the guiding member 3 at the tip of the intra-tube wire passing tool 20 is square or other rectangular as described above, and therefore comes into contact with the inner circumferential surface of the tube 21 to emit sound. Since the pipe 21 is a steel pipe and the main wire 1 and the auxiliary wire 2 have elastic force, the guiding member 3 easily vibrates, and a relatively loud sound is generated. This sound is detected at the ground surface 22 by a microphone 23. In this way, the tube 21
installation situation, and the direction of entry of the in-pipe wire passing device 20,
Furthermore, the position of the guiding member 3 can be known from the ground surface 22.

FIG. 7 is a plan view seen from the ground surface 22. tube 2
1 is indicated by a broken line, and when the pipe wire threading device 20 enters in the direction of the arrow mark 27 with the guiding member 3 at the beginning, the sound spreads to the rear of the pipe wire threading device 20. The inventor of the present invention found through experiments that the distribution of the equal sound pressure level is oval or elliptical, as indicated by reference numeral 28. By knowing the distribution 28 of such equal sound pressure levels,
The position 3a of the guiding member 3 of the pipe wire passing device 20 can be known. Position 3a has equal sound pressure level distribution 28
It is closer to the front in the approach direction 27.

Tube 21 is connected to tubes 29, 30 as shown in FIG.
When the pipe is branched into the pipe 2,
You can tell on the ground whether to branch off to 9 or 30. Microphones 23 are provided at positions indicated by reference numerals 31, 32, and 33, so that the position of the guiding member 3 can be known from the ground surface.

As described above, according to the present invention, the tip of the guiding member provided at the end of the pipe wire passing tool is square, so that the corner portion is formed on the inner circumferential surface of the pipe through which the wire is threaded. A sound is generated upon contact, and by detecting that sound from outside the pipe, it is possible to know the direction in which the pipe extends, the direction in which the pipe wire threading tool enters, and the position of the tip of the pipe wire threading tool. become able to. This makes it easy to excavate a vertical hole to expose underground pipes, etc., or to easily enter a desired branched pipe with an in-pipe wiring tool. Become. In addition, by bringing the tip of the pipe-intraducting device to a predetermined position within the pipe, gas leakage prevention work and other various works described above can be performed.

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 guiding member, and therefore can easily enter the pipe.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a perspective view of the vicinity of the guiding member 3, Fig. 3 is a piping diagram for explaining the wiring work, and Fig. 4 is a wiring diagram of the vicinity of the guide member 6. FIG. 5 is a cross-sectional view showing the wire condition, FIG. 5 is a cross-sectional view for explaining the operation of running the wire into the pipes 14 and 16, and FIG. FIG. 7 is a cross-sectional view showing a sound detection state, FIG. 7 is a plan view showing the distribution of equal sound pressure levels on the ground surface, and FIG. 8 is a plan view showing the branching state of the pipes 21, 29, and 30 on the ground surface. DESCRIPTION OF SYMBOLS 1...Main wire rod, 2...Auxiliary wire rod, 3...Guiding member, 4...Free end surface, 4a...Corner corner part, 20...In-pipe wire passage device, 23...Microphone, 25...Amplification circuit, 26...Speaker.

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 a pipe wire threading tool 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 pipe wire threading tool is inserted into the pipe. A tube detection method characterized by detecting sound from the outside.