JPH0956045A - Method and apparatus for identifying buried pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify a designated pipe among a group of buried pipes in the way of a duct to a manhole. SOLUTION: A sound wave is delivered from a speaker into a designated pipe on the manhole 10 side. A detector 22 having a diaphragm is applied to the outer wall of pipe and a decision is made whether it is a designated pipe based on the presence of leaked sound wave. A sound generated through resonance with the detector 22 is collected by a microphone and the electric signal may be amplified by an amplifier and converted into a sound through a speaker.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried pipe identifying method and device, and more particularly, to a buried pipe identifying method when a plurality of cable pipes containing a communication cable are buried and exposed.
The present invention relates to an identification method and device for accurately identifying a specific pipe in which a cable is not housed.

[0002]

2. Description of the Related Art Generally, a communication manhole 1 is connected by a plurality of pipes 2 buried in the ground, as shown in FIG. 4, and a communication cable is laid and housed in the buried pipe. And is using it. When a manhole is newly installed in the middle of such a communication cable storage pipeline, the ground is excavated in the middle of the route of the existing buried pipe to expose the pipe group, and the pipe specified from the pipe group is selected. It is necessary to identify and disconnect the pipe.

The identification of the designated pipes performed in this type of work is determined from the arrangement state of the pipes 2 mounted in the manhole 1, and the designated pipe 2 at the excavation point 3 is determined. In order to determine the designated pipe at the excavation point based on the arrangement of such buried pipes, it is assumed that all pipes are exposed and the same arrangement as the arrangement on the manhole side is made at the excavation point. You have to judge.

[0004]

However, in order to expose all the pipes at the excavation point, the excavation width becomes wider. When the excavation width becomes wider, the road restoration width becomes wider, and other buried objects and nearby There was a problem of damaging the building. Moreover, as shown in FIG. 4, with the arrangement of the tubes in the manhole 1,
Since the arrangement of the pipes at the excavation point 3 may not always match, the crushed pipe may be different from the designated pipe. In particular, crushing an erroneous pipe may not only restore the crushed pipe to its original shape, but may also damage the cable contained in the pipe and hinder communication.

On the other hand, in connection with the pipe identification method, there is known an encounter confirmation method for identifying the core wire of a cable. As shown in FIG. 5, this is because an electric signal is sent from the end of the cable 4 to a specific core wire 5 by a transmitter 6, and the electric signal received by the core wire 5 on the other end side of the cable is buzzer 7 or other. It is a method of specifying by converting into sound or light by means of. It is possible to apply such a method to pipe identification. However, as a condition of the method of specifying by an electric signal, it is necessary that the specified object (core wire) has conductivity and is insulated from other identified objects (core wire). There are two types of communication cable piping, vinyl-based non-conducting type and steel, but since steel is short-circuited to each other,
The method using such an electric signal cannot be applied to the identification of the communication cable piping.

The present invention focuses on the above-mentioned conventional problems, and a buried pipe identifying method capable of easily identifying a designated pipe from a buried communication pipe group at an excavation point between manholes. And to provide a device.

[0007]

According to the present invention, a signal transmitted inside a pipe such as a voice signal or a vibration signal is sent to a pipe designated on one end side of a pipe group, and is used at an excavation point in the middle of the pipe. It is based on the knowledge that the designated pipe can be specified by catching the transmission signal from the pipe surface.

That is, the buried pipe identifying method according to the present invention is a method for identifying a designated pipe by excavating and exposing a plurality of pipes laid in the ground between manholes. It is intended to achieve the above-mentioned object by sending a transmission signal such as a sound wave into the designated pipe from the designated pipe and identifying the designated pipe by detecting the transmission signal leaking from the designated pipe at the excavation point. is there.

Further, the buried pipe identifying apparatus according to the present invention is
A device for identifying a designated pipe by excavating and exposing a plurality of pipes laid in the ground between manholes, and a signal generating means for transmitting a transmission signal such as a sound wave from the pipe end of the pipe in the manhole into the designated pipe. And a detection means capable of detecting the transmission signal by contacting one of the pipe groups at the excavation point, and the designated pipe can be identified by detecting the same signal as the signal transmitted from the signal generation means. It is characterized by that.

In this case, the detecting means is composed of a diaphragm arranged facing the side surface of the pipe, and a closed container portion having a gap formed on the back surface of the diaphragm, and detects the vibration sound of the diaphragm. It suffices if it is configured to detect and detect the signal transmitted through the designated pipe, and the detection means includes:
A configuration may be provided that includes an amplifier that converts the detected transmission signal into an electric signal and amplifies the electric signal. More specifically, the detection means includes a diaphragm arranged to face the side surface of the pipe, and a closed container portion having a gap formed on the back surface of the diaphragm. The configuration may include a sound microphone and an amplifier for the signal sound detected by the microphone.

[0011]

According to the above construction, a voice, a vibration signal or the like is transmitted from the opening to the pipe to be designated on the manhole side where the end opening of the pipe group is formed. At a place excavated in the middle of the pipeline, a detection means may be joined to the predicted outer surface of the pipe to detect whether a voice or a vibration signal is transmitted in the pipeline. Since the transmission signal is transmitted inside the pipe, it is not transmitted to other pipes, so that the specified pipe can be specified from the outer surface of the pipe. This prevents the designated pipe from being mistakenly recognized, and prevents accidental disconnection of the non-designated pipe. Since the transmission signal can be transmitted through the inside of the pipe, the detection means may be composed of a vibration plate facing the outer surface of the pipe and a container-like member that covers the vibration plate so as to detect the vibration sound of the void inside the container. This can be realized by a so-called stethoscope-like device and by directly detecting the vibration of the pipe wall of the pipe. Amplification of the transmission signal into an electric signal for detection facilitates identification, and signal processing can be performed so that the signal is converted into a display signal for display and can be visually checked.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of a buried pipe identifying method and apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory diagram of a buried pipe identifying apparatus according to the present embodiment and an identification work state using the same. This is a configuration in which a sound wave is transmitted from one end of the designated pipe into the pipe and a sound wave leaking in the middle of the pipe is detected. The manhole 10 is formed at the starting position of the buried pipe, and the pipe group 12 (12A, 12A) is formed on the side wall of the manhole 10.
Each opening 14 in B) is exposed. On the other hand, an excavation hole 16 is formed in the middle of a pipe path from the manhole 10 to another manhole (not shown) for constructing a new manhole or the like, and a part of the pipe group 12 is exposed. In order to identify the pipe 12A designated by the departure manhole 10 by the excavation hole 16, a sound source 18 is provided in the departure manhole 10 for transmitting sound from the opening 14 of the designated pipe 12A, and the sound source 18 generates the sound. The designated tube 12A is the speaker 20 as the output unit of the sound wave to be generated.
The sound wave is sent out without leaking out of the tube. The sound wave thus sent out is sent into the sealed tube, so that the sound wave is transmitted with a small amount of attenuation.

On the other hand, a detector 22 for detecting the sound waves transmitted from each of the pipes 12A and 12B of the pipe group 12 exposed in the excavation hole 16 as a pipe identification point is provided. This detector 22 is, as shown in FIG.
(Or 12B) has an airtight container 26 in which an air gap 24 is formed in a state of being covered on the outer surface thereof. In the embodiment, this airtight container 26 is connected to the pipe 12A (or 12B).
The airtight container 26 is formed so that the cross section of the void 24 has a crescent-shaped cross section in a state of being in close contact with the surface of the. The contact surface 28 of the closed container 26 is the pipe 12A (or 1
2B), the pipe 12A (or 12
A vibrating plate 30 is arranged so as to face the outer surface of B) via a gap, and the void 24 of the closed container 26 is a closed space.
An audio conduit 32 is connected to the closed container 26 so that the audio signal transmitted to the inside of the space 24 can be detected by the diaphragm 30. As shown in FIG. 1, an earphone section 34 is connected to the tip of the voice conduit 32 so that the operator can hear the voice. As a result, the pipe 12A
(Or 12B) of the sound signal transmitted through the detector 22 is amplified by the detector 22 so that the designated pipe can be easily identified.

The operation using the buried pipe identifying apparatus having such a structure is as follows. First, departure manhole 10
The sound wave is transmitted from the speaker through the speaker 20 into the designated tube 12A. Expected piping 12 in the drill hole 16 at the drilling point
The detector 22 is pressed against the outer surface of A and the leaking sound wave is measured. When multiple tubes are measured, it is possible to distinguish between tubes with leak sound and tubes without leak sound. The leaking pipe is the designated pipe 12A. Leakage sound waves are amplified in the air gap 24 through the diaphragm 30 and can be heard by the earphone unit 34, so that the designated pipe 12A can be easily identified.

FIG. 3 shows an embodiment in which a sound wave detected by the detector 22 is electrically amplified. Instead of the audio conduit 32 connected to the closed container 26, a microphone 36 is attached, the detected sound wave is collected by the microphone 36, then amplified by the connected amplifier 38, and the sound is output by the speaker 40 as an output terminal. It is designed to be converted into. By doing so, a plurality of workers can hear each other at the same time, and it becomes easier to identify the designated pipe 12A.

According to the above-described embodiment, by transmitting the sound wave from the manhole 10 to the designated pipe 12A and detecting the sound wave leaking from the pipe at the excavation point, the designated pipe 12A can be identified without crushing the pipe. is there. Therefore, it is not necessary to repair the pipe by accidentally crushing the pipe, and when crushing the pipe, the cable laid inside the pipe is not damaged and communication is not disturbed. Since the designated pipe is not predicted from the pipe arrangement, the excavation hole 16 does not expand more than necessary, preventing damage to other buried objects and nearby structures and expansion of the road restoration area due to the expansion of the excavation width. it can.

In the above embodiment, the sound source 18 is used to transmit an audio signal to one designated pipe of the pipe group 12. However, this applies impact vibration from the pipe opening 14 side. It is also possible to transmit a conduction signal which can be distinguished from general vibration such as intermittent impact vibration, and to directly detect the transmitted vibration on the side of the excavation hole 16.

[0018]

As described above, according to the present invention,
A transmission signal such as voice is sent from the manhole side to the inside of the specified pipe, and this transmission signal can be detected from the surface of the pipe at the excavation point in the middle of the pipe, so the specified pipe can be reliably identified without cutting the pipe. Therefore, an excellent effect that the identification work can be significantly reduced can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view of a buried pipe identifying device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a detector used in an embodiment of the present invention.

FIG. 3 is a configuration diagram showing another example of a detector.

FIG. 4 is a cross-sectional perspective view of a pipe laying condition in a manhole, a buried section, and an excavation point.

FIG. 5 is an explanatory diagram for identifying a cable core wire by an electric signal.

[Explanation of symbols]

 10 Departure Manhole 12 Piping Group 14 Opening 16 Drilling Hole 18 Sound Source 20 Speaker 22 Detector 24 Gap 26 Sealed Container 28 Piping Contact Surface 30 Vibration Plate 32 Voice Conduit 34 Earphone Part 36 Microphone 38 Amplifier 40 Speaker

Claims (5)

[Claims] 1. A method for identifying a designated pipe by excavating and exposing a plurality of pipes laid in the ground between manholes, wherein a transmission signal such as a sound wave is transmitted from the pipe end of the pipe in the manhole into the designated pipe. A buried pipe identifying method, characterized in that a designated pipe is identified by detecting the transmission signal transmitted and leaking from the designated pipe at an excavation point. 2. A device for identifying a designated pipe by excavating and exposing a plurality of pipes laid in the ground between manholes, wherein a transmission signal such as a sound wave is transmitted from the pipe end of the pipe in the manhole into the designated pipe. A designated pipe is provided by providing a signal generating means for sending out, and a detecting means capable of detecting the transmission signal by contacting one of the pipe groups at the excavation point, and detecting the same signal as the signal transmitted from the signal generating means. A buried pipe identifying device characterized in that it is possible to identify. 3. The detecting means is composed of a diaphragm arranged facing the side surface of the pipe, and a hermetically-sealed container part having a gap formed on the back surface of the diaphragm, and detects the vibration sound of the diaphragm. The embedded pipe identifying device according to claim 2, wherein the signal transmitted through the designated pipe is detected. 4. The buried pipe identifying device according to claim 2, wherein the detecting means includes an amplifier that converts the detected transmission signal into an electric signal and amplifies the electric signal. 5. The detection means includes a diaphragm arranged to face the side surface of the pipe, and a closed container part having a gap formed on the back surface of the diaphragm, and the sound collecting part adsorbed to the closed container part. 3. The embedded pipe identifying device according to claim 2, further comprising a microphone and an amplifier for a signal sound detected by the microphone.