JPS60205229A - Apparatus for detecting abnormality of piping - Google Patents

Abstract

PURPOSE:To facilitate the detection of abnormality regardless of the material quality of piping, by detecting the sound wave propagating through the gas in piping by acoustic energy generated by the abnormality at the arbitrary position of the piping embedded in the ground and measuring the abnormality of the piping. CONSTITUTION:A sensor 17 consisting of sensors 17a, 17b is arranged at a position 16 separated from the generation position of acoustic energy 14 of piping 11 embedded in the ground and having gas 12 interposed therein. Next, a measuring apparatus consisting of an accelometer 18, a data processing apparatus 19 and a display apparatus 20 is connected to the sensor 17. The sound wave 15 propagating through the gas by acoustic energy 14 generated upon the contact of a ground drilling machine 5 with the arbitrary position 13 of the piping 11 is detected by the sensor 17 and the distance L between the sensors 17a, 17b, distances l1, l2 between the position 13 and the sensors 17a, 17b and sound propagation times t1, t2 are inputted to the data processing apparatus 19 to operate the position 13 which is, in turn, displayed by the display apparatus 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a piping abnormality detection device, and more particularly to a piping abnormality detection device suitable for detecting abnormalities in pipes buried underground from above ground.

[Succession of invention]

Electromembrane K, piping buried underground may be exposed to hot water due to contact with the tip of an underground excavator during excavation work, or due to earthquakes, etc., and damage to this piping must be detected immediately. is very important in preventing serious accidents. However, since the location is buried underground,
It was extremely important that this loss was detected early.

For these reasons, a piping abnormality detection device as shown in the first example has been proposed.

The piping abnormality detection iron shown in the figure [Red e-ma, temporary structure 2 buried in earth and sand 7 is hI! For the piping 1 that has been removed, there is an external power supply circuit 3 that connects the piping base material 1 and the underground (earth), and a constant Ii for the piping base material! υ1 is the yaryu training circuit 4 installed in the seed.
・Setting +p=. If the tip of the underground excavator 5 comes into contact with the pipe 1, or if the pipe 1 is damaged due to an earthquake or the like and the exposed part is torn, the external power supply circuit 3
A current 6 flows through the ground from the ground end of the sheathing 2, and the current 6 reaches the inside of the pipe 1 through the damaged part of the sheathing 2, and the thread of the external circuit 3 is formed. The first-class detection circuit 4 installed between the damaged part and the external power supply circuit 3 is activated.

This detects that damage has occurred in section 9. 8 is an ammeter provided in the external power supply circuit 3.

In this way, this device detects an abnormality in the pipe l buried underground.

It is effective only when the piping 1 is coated with the coating 2, and is applicable to general 411 piping without coating, joints with seals,
Alternatively, it has the disadvantage that it cannot be used for plastic piping, etc.Also, if piping 1 is damaged but the coating 2 is not damaged, it is difficult to detect the abnormality, and it is difficult to locate the exact location of the damage. , there is a problem in which the size detection is difficult.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to accurately detect abnormality occurrence regardless of the material or structure of the piping. An object of the present invention is to provide an abnormality detection device capable of detecting abnormality and size.

[Summary of the invention]

The present invention detects liquid waves propagating in the gas inside the pipe due to Ck'4''lA and Lugi caused by an abnormality at any position of the pipe at a point IL from the point where the energy is generated. A device is installed in the pipe, and a measuring device is installed to measure the abnormality of the OiJ mark based on the data detected by the magnetic sensor. By using a detection device that has a

This was done to achieve the purpose of the 151st term.

That is, in contrast to the conventional detection method in which electrical energy is supplied from outside in advance, the present invention utilizes the phenomenon in which acoustic energy generated by damage to pipes propagates through the gas inside the pipes. #Propagation also occurs in thick-walled pipes, but this energy is susceptible to energy reduction during propagation due to the effects of dirt, coatings, water, etc. on the pipe or outside, and the detectable distance may be damaged. It becomes shorter from the point of origin, making it difficult to detect from a remote location.

However, it has the advantage of being unaffected by sound propagating in the gas and by dirt and sand outside before direct distribution.
The present invention focuses on this phenomenon because it is estimated that it propagates in a frequency range of around Hz and has characteristics that make it difficult to attenuate, making it possible to carry out long-distance acoustic propagation.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on embodiments of the drawings.

FIG. 2 shows a case where an abnormality in gas piping is detected using an embodiment of the piping abnormality detection device of the present invention.

As shown in the figure, gas 12 is present in the pipe 11 buried underground 7, and the device for detecting an abnormality in the pipe 11 detects the abnormality at any position of the pipe 11 in this embodiment. Acoustic energy generated by, for example, an earth excavator 5
The tip of the pipe 11 contacts the pipe 11 at an arbitrary position 13, and the acoustic energy 14 generated causes the waste 1 to
A sensor 17 installed on the surface of the pipe 11 detects the Shin wave 15 propagating through the gas 12 at a position 16 distant from the acoustic energy 140 generation position 13, and the W wave 15 of the gas 12 detected by this sensor 17. Acceleration M#t18 to be measured, a data processing device 19 that analyzes based on the measurement result of this accelerometer 18 and data inputted in advance, and an abnormality of the piping 11 based on the signal processed by this data processing device 19. Display device 20 that displays the location of occurrence and thick awn of abnormality
It is roughly composed of.

Next, FIG. 3 shows the principle of the No. 1g processing system in the apparatus shown in FIG.

In FIG. 3, if an abnormality in arrangement #11 occurs at position 13, sensors 17a and 17b can detect it in advance.
The distance between ll1IL and #J is added to the abnormality occurrence position [distance from 13 to each sensor 17a, 17b At, t
t, sound propagation velocity V, and abnormality occurrence position 13i-, etc. # Write propagation time 'In t! for distance tl and zx to 17a and 17b. When the data processing device 19 performs arithmetic processing using ! as a parameter, ! '4 The position of occurrence 13t; t, the sensor 17 whose installation position is known in advance
With respect to the positions of a and 17b (where Δ1=1.-12), the detection signals of the two cells 17a and 17b are sequentially set as the detection signal level h to the data processing device in time series. By performing arithmetic processing in step 19, the extent of abnormality occurrence Wt, tI (or Ax) in the piping 11 and the magnitude of the abnormality are detected and displayed on the display device! What to display on i20K
You can know very well.

Similarly, the data in the data processing device 19 is transmitted to the data transmitter 2.
The data can also be transmitted to and managed by a remote central monitoring device 1122 via wire or wirelessly.

The arrangement of the W abnormality detection device of this embodiment is as follows.
In addition, it is possible to detect abnormalities regardless of the material and structure of the piping, such as uncoated piping, pipes with sealing material, and plastic piping, which could not be covered by conventional electrical abnormality detection devices. Range that can be detected by one sensor (
A U-takumi who can spread out large and medium-sized traps (distance), and who can easily move the 1st position of the loading dock that was Kenyoneda Ri, and the inusasa-dera kokuho by data processing, is a preview. It is possible to quickly detect three problems caused by excavation work, which are often done without doing anything, so for example, it is possible to prevent the University of Tokyo accident, such as the leakage of waste from the Ichikawa gas transmission line, which is currently a major issue. It is possible to prevent this from occurring, and it can also be applied to each stock pipeline, so it can be greatly devoted to the losers of the burial technique where the maintenance of '≦6 in the burial arrangement is made at one time.

In the above-mentioned example, the sensor is placed on the piping surface.
I explained about the jLk type, but the sensor is arranged in advance.
i (c Aj set-(, the young fruit is the same.

[Effect of brother Ming]

The piping abnormality hanging detection device of the present invention, which has been explained above, *
nt, 'Official Appointment and Honesty') 4 The jj wave that propagates in the gas in the pipe due to the leaf energy generated by the suspension rt is detected at another point away from the point where the IF energy is generated. Based on the data detected by the sensor, a detection device equipped with a measuring device that attaches the pipe to the side of the pipe is installed. Because of this, it is possible to detect any abnormalities that occur in the gas inside the piping, regardless of the structure of the piping.

Moreover, based on the detected data, the degree of abnormality occurrence (d,
It is possible to obtain more accurate information than by detecting the size, and it is very effective for detecting abnormalities in this self-control system.

[Brief explanation of drawings]

Figure 8F41 is a diagram showing a state in which an abnormality in a pipe buried underground is detected by the conventional arrangement I# abnormality extraction device i, and Figure 2 is an example of an implementation of the piping abnormality detection device of the present invention. For example, Figure 3 is a diagram showing a state in which an abnormality is being detected in a pipe buried underground, and Figure 3 is a diagram to congratulate the No. 1g treatment system in the equipment shown in Figure 2. is. 5...Earth excavator, 11...Piping, 12...Gas, 14...Acoustic energy, 15...Sound wave, 17,
17a. 17b...sensor, 18...acceleration 8t, 19...
・Data processing device, 20...Display device, 21...Data transmitter, Fig. 1 Fig. 2

Claims (1)

[Claims] 1. In a device that detects an abnormality at any position of a pipe buried underground and in which gas is present, the system detects an abnormality at any position of the pipe by acoustic energy generated by an abnormality at any position of the pipe. When a sensor is installed at a certain distance on the piping to detect sound waves propagating through the gas at a point away from the point where the acoustic energy is generated, the sensor detects the sound waves propagating through the gas at a point away from the point where the acoustic energy is generated. A piping abnormality detection device comprising: a measuring device for measuring an abnormality. 2. The dl side device includes an accelerometer that determines tllQ of the gas I detected by the sensor, and tll! of the gas detected by the sensor; Consisting of a data processing device that performs analysis based on the I-foot results and pre-entered data, and a display device that displays the location and size of the abnormality based on the signal processed by the data processing device. Q! fa'
1. The piping abnormality detection device according to item 1. 3. The data processing device calculates the distance between the cells, which has been manually inputted in advance, the measured distance from the abnormality occurrence position to each sensor, the acoustic propagation velocity, and the distance from the abnormality occurrence position to each sensor. 3. The piping abnormality detection device according to claim 2, wherein the arithmetic processing is performed based on sound propagation time. 4. The piping abnormality detection device according to claim 2 or 3, characterized in that the processing results of the mJ data processing device are transmitted to the central monitoring board of the centrifuge using a data transmitter. . 5. The piping abnormality detection device according to claim 1 JIJ, wherein the senna is installed on the surface of the piping. 6. The piping abnormality detection device according to claim 1JJ4, wherein the sensor is installed in the piping in advance.