JP2000028745A - Buried pipe break detection method and apparatus - Google Patents

Abstract

(57) [Summary] [Problem] A buried pipe rupture that can determine whether or not a buried pipe underground is broken on the way and, if there is a rupture, can identify the location of the rupture. A detection method and apparatus are provided. SOLUTION: An embedded device including a pulse generator 14 and a transmitting antenna 15 for radiating an electromagnetic wave from the ground toward the ground, and a receiver 16 and a receiving antenna 17 for receiving a reflected wave of the electromagnetic wave from a buried underground pipe 6. A pipe rupture detection device,
Transmitting and receiving unit 1 while radiating electromagnetic waves from transmitting antenna 15
2 is scanned in a predetermined direction, and when this scanning is performed a plurality of times while changing the position, a function of detecting the hyperbolic pattern of the reflection pattern for each scan by receiving the reflected wave from each scan by the receiving antenna 17. The processing unit 13 prepares the tube axis direction by connecting the vertices of the hyperbolic pattern obtained for each scan, and then determines the transmission antenna 15 along the tube axis.
When a valley occurs in the transition of the intensity peak value of the reflection pattern obtained by this scanning, the processing unit 13 is provided with a rupture position detection function of detecting a rupture position from the valley. Pipe break detector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a rupture of a buried pipe buried in the ground by propagation of electromagnetic waves.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A buried pipe detecting device 1 described in No. 9396 is known. The buried pipe detecting device 1 includes a movable trolley 2 and a main body 3. The mobile trolley 2 includes a transmitter 4 and a transmitting antenna 5 for transmitting radio waves, and a receiver 7 and a receiving antenna 8 for receiving a reflected wave from the buried pipe 6. And a display device 10.

In such a configuration, when a radio wave is emitted from the transmitter 4 via the transmitting antenna 5 while moving the mobile trolley 2 over the ground surface, the reflected wave reflected by the buried pipe 6 is received via the receiving antenna 8. Received by the device 7. Arithmetic unit 9
Forms an echo image based on the moving distance of the mobile trolley 2 and the received wave signal received by the receiver 7, and the display device 10 displays the echo image formed by the arithmetic device 9. Then, based on the echo image displayed on the display device 10, the propagation speed of the underground radio wave is calculated, and the position and the depth of the buried pipe 6 are detected based on the propagation speed.

[0004]

By the way, in the above-mentioned buried pipe detecting device, the position of the buried pipe 6 can be detected by calculating the propagation speed of radio waves in the ground. There was a problem that it could not be detected.

The present invention has been made in view of the above-mentioned problems, and it is possible to judge whether or not a buried pipe underground is broken on the way, and if there is a break, the pipe can be determined. An object of the present invention is to provide a method and an apparatus for detecting a buried pipe rupture capable of specifying a location.

[0006]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 radiates an electromagnetic wave from the ground toward the ground, receives a reflected wave of the electromagnetic wave from a ground buried pipe, A buried pipe rupture detection method for detecting rupture of an underground buried pipe based on the reflected waves, in which scanning is performed in a predetermined direction while radiating electromagnetic waves, and this scanning is performed a plurality of times while changing the position. Receiving the reflected waves by scanning, obtaining the hyperbolic pattern of the reflection pattern for each scan, obtaining the direction connecting the vertices of these hyperbolic patterns as the tube axis direction, and then scanning in the direction along the tube axis while emitting electromagnetic waves Then, when a reflection wave is received by this scanning and a reflection pattern is obtained, and a valley occurs in the transition of the peak value of the reflection pattern,
This valley is specified as a breaking position.

According to a second aspect of the present invention, there is provided a buried pipe rupture detecting apparatus comprising: a transmitting device that radiates an electromagnetic wave from the ground toward the ground; and a receiving device that receives a reflected wave of the electromagnetic wave by the buried pipe. There, scanning in a predetermined direction while radiating electromagnetic waves from the transmitting device, when performing this scanning a plurality of times while changing the position, the reflected wave by each scanning is received by the receiving device, for each scan A hyperbolic pattern detecting means for detecting a hyperbolic pattern of the reflection pattern, a pipe axis direction determining means for determining a pipe axis direction by connecting vertices of the hyperbolic pattern obtained for each scan, and the transmitting device along the pipe axis And when a valley occurs in the transition of the intensity peak value of the reflection pattern obtained by this scanning, a rupture position detecting means for detecting a rupture position from the valley is provided.

According to the first and second aspects of the present invention, if there is a broken portion in the underground buried pipe, the peak value of the reflection pattern of the buried pipe changes in intensity at this broken position. It is possible to detect the breakage of the pipe and specify the breakage position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A buried pipe breakage detecting device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing a buried pipe rupture detecting device 11, which includes a transmitting / receiving unit 12 and a processing unit 13.

The transmission / reception unit 12 includes a pulse generator 14 and a transmission antenna 15, and a receiver 16 and a reception antenna 17.

The pulse generator 14 includes therein a circuit for generating a pulse at regular intervals, and the generated pulse is supplied to a transmission antenna 15. The transmitting antenna 15 emits an electromagnetic wave with this power supply.

On the other hand, the receiver 16 has therein a circuit for amplifying an electromagnetic wave received via the receiving antenna 17 and further converting the electromagnetic wave into a predetermined low-frequency signal.

The processing unit 13 includes an A / D converter 18 and
A signal processor (break determination unit) 19 and a TV monitor 20
And a keyboard input device 21.

The A / D converter 18 has a function of converting a low-frequency signal input from the receiver 16 into a digital signal.

The signal processor 19 processes the digital signal input from the A / D converter 18 on the basis of the distance in the scanning direction of the transmission / reception unit 12 and the acquisition time of the received signal. Is provided.

The TV monitor 20 displays the echo image formed by the signal processing section 19.

The operation of the buried pipe breakage detecting device 11 having the above configuration will be described.

First, detection of a buried pipe 6 such as an underground water pipe, a gas pipe, an electric cable, or the like by one scanning of the buried pipe break detecting device 11 will be described.

When the transmission / reception unit 12 is moved in the fixed direction on the ground and the electromagnetic wave is emitted from the transmission antenna 15 toward the ground by the pulse of the pulse generator 14, the transmitted electromagnetic wave is reflected by the buried pipe 6 and then received by the reception antenna. 17 and is received by the receiver 16. The received electromagnetic wave is converted to a low-frequency signal by the receiver 16 and further converted to a digital signal by the A / D converter 18, and then processed by the signal processor 19 to form an echo image of the buried pipe 6. The formed echo image is displayed on the TV monitor 20.

When scanning is performed in a direction crossing the buried pipe, the echo image displayed here has a hyperbolic pattern as shown in FIG. Note that the horizontal axis is the scanning distance of the transmission / reception unit 12, and the vertical axis is the reception signal acquisition time. Here, since the acquisition time of the received signal and the depth of the buried pipe 6 are proportional, the position where the acquisition time is the shortest is the distance of the buried pipe 6 from the ground surface (that is,
(Depth) indicates the shortest position, and this position can be regarded as the position of the buried pipe 6. That is, the apex of the hyperbolic pattern corresponds to the position of the buried pipe 6. Whether the scanning direction is a direction crossing the buried pipe 6 is determined by the TV.
The determination may be made based on the echo image displayed on the monitor 20.

Next, a method of determining the pipe axis of the buried pipe 6 will be described.

First, as shown in FIG. 3, the transmission / reception unit 12 is moved from each scanning start point along each scanning direction, and an echo image of the buried pipe 6 is detected. Since the operation here is the same as the above-described detection operation, detailed description will be omitted.

The hyperbolic patterns of the echo images obtained for each scan are detected, the vertices of these hyperbolic patterns are determined, and these vertices are connected as shown in FIG. Judge as the tube axis direction.

Next, a method for detecting the break position of the buried pipe 6 will be described.

First, the buried pipe 6 determined by the method described above is used.
The transmission / reception unit 12 is moved along the direction of the tube axis substantially right above, and an echo image of the buried tube 6 is detected. Since the operation here is the same as the above-described detection operation, detailed description will be omitted.

In the echo image obtained by this scanning, if there is a break in the buried pipe 6, the transmitted electromagnetic wave penetrates to the break and the intensity of the reflected wave because of the presence of the pipe edge. Changes. That is, a valley T appears in the echo image E as shown in FIG. Therefore, this valley T
The breakage of the buried pipe 6 can be detected based on the presence or absence of the buried pipe. When this trough T appears, as shown in FIG. 5, the breaking position of the buried pipe 6 can be specified from the acquisition time of the trough T and the scanning position.

The buried pipe break detecting device scans the buried pipe 6 in the axial direction. If no valley appears in the echo image, it is determined that the buried pipe 6 is connected normally. Can also.

[0029]

As described above, according to the method and the apparatus for detecting rupture of a buried pipe according to the present invention, when scanning is performed while radiating an electromagnetic wave from a transmitting device along a pipe axis, a reflection pattern obtained by this scanning is obtained. When a valley occurs in the transition of the intensity peak value, since a rupture position detecting means for detecting a rupture position from the valley is provided, it is possible to determine whether or not the underground buried pipe is broken on the way, In addition, when there is a break, the location can be specified. It can also be used to determine that the buried pipe is connected properly.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a buried pipe break detection device.

FIG. 2 is a graph showing a reflection pattern of a buried pipe when the buried pipe rupture detection device is scanned.

FIG. 3 is a diagram showing a scanning direction for detecting an apex of a buried pipe when viewed from the ground surface.

FIG. 4 is a diagram connecting the apex positions of the buried pipe obtained by each scan.

FIG. 5 is a graph showing a reflection pattern when a buried pipe is broken.

FIG. 6 is a configuration diagram showing a conventional buried pipe break detection device.

[Explanation of symbols]

 Reference Signs List 6 buried pipe 12 transmitting / receiving unit 13 processing unit 14 pulse generator 15 transmitting antenna 16 receiver 17 receiving antenna

Claims (2)

[Claims] A buried pipe rupture detector for radiating an electromagnetic wave from the ground toward the ground, receiving a reflected wave of the electromagnetic wave from the buried pipe, and detecting a break of the buried pipe based on the reflected wave. Scanning in a predetermined direction while radiating an electromagnetic wave, performing this scanning a plurality of times while changing the position, receiving a reflected wave from each scan, and obtaining a hyperbolic pattern of a reflection pattern for each scan. The direction connecting the vertices of these hyperbolic patterns is determined as the direction of the tube axis. Then, scanning is performed in the direction along the tube axis while radiating electromagnetic waves. When a valley is generated in the transition of the peak value, the valley is identified as a rupture position. 2. A buried pipe rupture detecting apparatus comprising: a transmitting device that radiates an electromagnetic wave from the ground toward the ground; and a receiving device that receives a reflected wave of the electromagnetic wave from the buried pipe, the transmitting device comprising: When scanning in a predetermined direction while emitting electromagnetic waves from the device, and this scanning is performed multiple times while changing the position,
A hyperbolic pattern detecting means for receiving a reflected wave from each scan by the receiving device and detecting a hyperbolic pattern of a reflection pattern for each scan, and connecting the vertices of the hyperbolic pattern obtained for each scan to the tube axis direction. Means for judging the direction of the pipe axis, and when the transmitting device is scanned along the pipe axis, when a valley occurs in the transition of the intensity peak value of the reflection pattern obtained by this scanning, the breaking position is detected from the valley. A buried pipe rupture detecting device, comprising: