JPS60111175A - Detecting method of pipe - Google Patents

Abstract

PURPOSE:To detect the advance direction and the tip position of an in-pipe wire passing tool by making the in-pipe wire passing tool having a leading member whose tip is square passes through into a pipe, and detecting the sound from the outside of the pipe. CONSTITUTION:An in-pipe wire passing tool 20 consists of an auxiliary wire rod 2 provided on the end part of a main wire rod 1, and a leading member 3 whose tip is square. When the in-pipe wire passing tool 20 is made to pass through into a tee 6 through a leading-in pipe of an underground buried pipe 5, the auxiliary member 2 advances in a flexible pipe 5 by a weight of the leading member 3. A free end face 4 of the leading member 3 is square, therefore, when a corner part 4a step difference in the pipe, it jumps and gets over the step difference by an elastic force of the auxiliary member 2 and the main wire 1. An advance direction and a tip position of the in-pipe wire passing tool 20 are detected by detecting the sound generated in the pipe 5 through a microphone on the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for inserting a wire running tool into an underground pipe, a pipe embedded in the wall of a building, or a hidden IF+F pipe, and adjusting the direction in which the pipe extends and the wire threading tool inside the pipe. This invention relates to a novel tube detection method for determining the direction of approach of a tube.

For example, underground pipes that transport gas fuel have complex branches underground. Therefore, it is difficult to accurately know the buried position of the pipe on the ground surface.

Therefore, it is difficult to accurately excavate 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.

The so-called in-pipe wiring fittings are used as a measure to prevent gas leakage from pipe joints, such as by spraying glycol liquid into the pipe, or by sandblasting or 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.Alternatively, an AC oscillator is introduced into the pipe to monitor 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 injection tubes, liquid discharge tubes, oscillators, banks, fiberscopes, heaters, and other intraductal inserts are required to introduce into the conduit.

Therefore, underground pipes for transporting gas fuel are branched underground as described above. Therefore, it is necessary to insert the intra-pipe wire passing device into the target pipe.

Conventionally, it has not been possible to know the direction in which the wire passing tool 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.

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 a relatively large elastic force, is made of piano wire, etc., and is constructed by winding the piano wire in a spiral shape, and has a length of 20 m 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 smaller elastic force 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, 10 cm.
It may be before or after.

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 guiding member 3 is tapered,
It is fixed to the auxiliary member 2 as described above. This friendship benefit 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 1, and can withstand reuse.

Referring to FIG. 3, a pipe 6 is connected to the upper part of the underground pipe 5, and an above-ground standpipe 8 is connected to the pipe 6 from a service pipe 7 to supply gas to a house 9. Ru. Although a pipe joint 10, an elbow 11, a valve 12, etc. are interposed in these lead-in pipes 7 and stand pipes 8, according to the in-pipe wire passage device 20 according to the present invention, the guide member 3 is connected from these stand pipes 8. The pipe 5 can be entered 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 rod 2 is bent by the gravity of the guiding member 3, so that the guiding part 3 is connected from the Qi 6 to the tube 5.
It becomes easier to move inward. When the auxiliary wire 2 is hanging down due to the gravity of the guiding part 3, the main wire 1 is rotated around its axis and the main I%! By pushing in the guide part 1, the guide part 3 can enter the tube 5 while rotating and vibrating.

Further, as shown in FIG. 5, the end of the tube 14 is connected to the plug J
5, and even if a branched pipe 16 is connected near this plug 15, an intra-pipe wire threading device 20 according to the present invention is inserted from the pipe 14 to the pipe 16 as indicated by the arrow 17. The tube 16 can be entered as shown in FIG.
From there, the tube 14 can be entered as indicated by arrow 18.

The base end 4 of the rust guide member 3 is square, and therefore the corner 4a of the free end face 4 is likely to get caught in steps at elbows, tees, pipe joints, etc. When this corner 4a gets caught on 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 portion 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 pipe wire passing tool of the illustrated embodiment, it was found that
It was confirmed that the line could be connected with a probability of 93, the success rate was extremely high, and the time required for the line was relatively short.

The illustrated in-pipe conduit 20 according to the present invention is capable of passing not only underground gas pipes, but also pipes disposed within the walls of other buildings, other sealed areas, or even exposed pipes. It may be.

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 device 20 may have a guiding member whose front end is square in shape, and the remaining configuration may be changed. is entering a pipe 21 buried underground that transports gas fuel. A microphone 23 is provided on the ground surface 22, and the microphone 23 is covered with a cover 24 made of a material such as rubber for sound insulation. Microphone 2
The acoustic signal from 3 is amplified by an amplifier circuit 25,
The sound is made into sound by the speaker 26. As described above, the free end surface 4 of the guiding member 3 at the tip of the pipe wire passing tool 20 has a rectangular shape such as a square, and thus comes into contact with the inner circumferential surface of the pipe 21 and emits sound. Since the tube 21 is a steel tube and the main wire 1 and the auxiliary wire 2 have elastic force, it is easy to photograph the guiding member 3 and a relatively loud sound is generated. This sound is detected at the ground surface 22 by a microphone 23. In this way, the installation status of the pipe 21, the approach direction of the pipe wire passing device 20, and the position of the guiding member 3 can be determined on the ground surface 22.
You can know from.

FIG. 7 is a plan view seen from the ground surface 22. The pipe 21 is indicated by a broken line, and the guide member 3 is placed at the top of the pipe 21, and the pipe wire passing tool 2
0 is moving in the direction of the arrow 27, the sound spreads behind the intraductal wire passing device 20. The inventor's experiments have shown 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 ff13a of the guiding member 3 of the pipe wire passing tool 20 can be known. The position 3a is near the front of the iso-sound pressure level distribution 28 in the approach direction 27.

When the pipe 2 branches into pipes 29 and 30 as shown in FIG. 8, it is possible to know on the ground which of the pipes 29 and 30 the intra-pipe wire passage device 20 branches into and enters. Microphones 23 are located at the positions indicated by reference numbers 31, 32, and 33.
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 comes into contact with the inner circumferential surface of the pipe through which the wire is threaded. A sound is generated, and by detecting this sound from outside the pipe, it becomes possible to know the direction in which the pipe extends, the direction in which the wire threading tool enters the pipe, and the position of the tip of the wire threading tool. . This makes it easy to excavate a vertical hole to expose an underground pipe or the like, or to easily enter a desired branched pipe with an intra-pipe wire passing tool. 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.

[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 guide member 3, Fig. 3 is a piping diagram for explaining the wiring work, and Fig. 4 is a diagram of the vicinity of the guide member 3. FIG. 5 is a cross-sectional view showing the wire running state; FIG. A cross-sectional view showing the state in which the wire is connected and sound is detected, FIG. 7 is a plan view showing the distribution of the Kasa sound pressure level on the ground surface,
FIG. 8 is a plan view showing the branching state of the pipes 21, 29, and 30 on the ground surface. j...Main wire rod, 2...Auxiliary wire rod, 3...Guiding member, 4...Free end surface, 4a...Corner corner portion, 20...Wire passing through pipe, 23...Microphone , 25... Amplification circuit, 26... Engraving of speaker section (Contents (q without Kojisara) Figure 5 Procedural amendment (method) Patent application filed March 8, 1980, 1982 S-2191 S1, Title of the invention Detection method of pipe 3, Relationship with the case of the person making the amendment Applicant address name (028) Osaka Gas Co., Ltd. 6, Specification subject to amendment, drawings and power of attorney 7, Contents of amendment (11 Ming #11 and drawings) Engrave (no change in content7). (2) Supplement the power of attorney as attached.

Claims (1)

[Claims] 1. A method for detecting a tube, comprising: passing an intra-tube wire passing tool having a guiding member having a rectangular front end shape into the tube, and detecting sound from a force outside the tube.