JP2015102361A - Water leakage detection method of underground piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water leakage detection method of underground piping capable of easily detecting the presence/absence and position of water leakage without requiring a precise detection system in a wide area piping network.SOLUTION: When the water leakage detection device 1 installed in underground piping P determines leakage, it can automatically transmit a leakage signal including leakage information and positional information of the detection device 1 to a mobile phone 2 in a remote business office or the like via a radio repeater 3. When the mobile phone 2 receives the leakage signal, an operator rushes to a field site, and searches for the water leakage part while moving a water leakage detector on the surface above the underground piping P around the detection device 1.

Description

  The present invention relates to a leakage detection method for buried piping.

Various research and development have been conducted on leak detection technology for underground pipes for water supply. The oldest existing technology is the road surface listening survey method. This is to listen to vibration sound from the ground on the buried pipe using the device described in Patent Document 1 and determine the presence or absence of water leakage in the field. Specifically, the vibration is detected by bringing the pickup into contact with the ground, and the operator listens to the result of electrical amplification of the sound by the main body of the device, and compares it with past experience, a reference water leak sound sample, or records the frequency. Analysis is performed and the presence or absence of water leakage is judged by comparison with past basic data.
Japanese Patent Publication No. 61-30700

This method is effective for finding local water leaks because the operator carries the device while moving on the buried piping, but is not suitable for a wide area piping network. On the other hand, as a water leakage detection system that centrally monitors a wide-area piping network, a technique such as Patent Document 2 can be cited. The underwater sound from the water leakage sound sensor installed in the pipe is A / D converted and then input to a remote water leakage sound data processing device via a telephone line, etc., and this processing device determines whether there is a water leakage sound. Is. In addition, this system is able to identify the leak location.
JP-A-11-117356

  However, a system like patent document 2 must be based on comparison with past basic data such as a waveform of water leakage sound, and the basic principle of water leakage detection is not much different from the road surface tone survey method. On the other hand, it is premised that basic data of various parts of the piping network in a wide area is available, and the pipe diameter etc. changes every time there is an update work, so it is necessary to re-enter data etc. due to these changes, It will take time to maintain the system.

  On the other hand, when there is water leakage in the pipe, the flow rate and water pressure in the pipe always change, so these are often used as detection targets for determining whether there is water leakage. Also, in reality, there are many cases where the leaking pipe body is replaced in the buried piping, and it is only necessary to know where the leaking pipe body is buried instead of the leaking pinpoint. . For this reason, it is doubtful whether a precise detection system as described in Patent Document 2 is really necessary.

  The subject of this application is providing the leak detection method of the buried piping which can detect the presence or absence and the position of water leak easily, without constructing | assembling a precise | minute detection system in a wide area piping network.

  In the leakage detection method for buried piping, the abnormality reporting means automatically transmits an abnormality signal consisting of the abnormality information detected by the abnormality detecting means installed in the buried piping and the position information of the detecting means, and received. When the abnormality signal is received by the means, the water leakage location is searched while moving the water leak detector on the ground surface on the buried pipe around the detection means.

  With such a method, it is possible to immediately know at a remote office or the like the piping abnormality that has been specified to some extent by the detection means, and after the operator has rushed to the site, the water leak detector can quickly leak the water. It becomes possible to specify the location. Even if it is found in the investigation by the leak detector that the abnormal signal is not due to the leak, it is possible to continue to examine the relevance of the other elements in the piping system with the abnormality, and never to the operator's site. Going out is never wasted.

  Moreover, in the leak detection method for the buried pipe, if the abnormality detection means and the detection target of the leak detector are the same, the accuracy of the presence / absence determination of leak can be further increased.

  The leak detection method for buried pipes of the present application can detect leaks quickly and with accuracy within a realistic range without constructing a precise system.

The simplified sectional view showing the state which is performing the leakage monitoring of the underground piping for water supply in one embodiment of the present invention Configuration explanatory diagram of abnormality detection means used in one embodiment of the present invention Explanatory drawing of one Example which is searching for a leak location with a leak detector Explanatory drawing of other examples which are searching for a leak location by a leak detector

  Hereinafter, an embodiment of a water leakage detection method according to the present invention will be described with reference to the drawings. FIG. 1 shows a state in which leakage of the underground pipe P for water supply is being monitored. In this embodiment, the leakage detector 1 is attached around the pipe near the branch T where the fire hydrant S is installed. . In addition, a radio repeater 3 that relays radio waves transmitted from the detection device 1 to a distant mobile phone 2 is installed on the ground surface nearby.

  As shown in FIG. 2, the detection device 1 includes a sensor 4 that detects vibration sound of piping, a control circuit 5 that measures vibration sound by the sensor 4 and determines the presence or absence of water leakage from the measurement result, and a measurement time. A clock circuit 6 is provided for managing the above. The control circuit 5 also has a notification function for automatically transmitting a leak signal to the mobile phone 2 via the telephone conversion circuit 7 when it is determined that water leaks.

  For example, when vibration sound is measured over the predetermined time, the control circuit 5 determines that it is “leak”. At this time, the control circuit 5 transmits the detected leakage information and the position information of the detection device as a leakage signal to the wireless repeater 3 via the telephone conversion circuit 7 and the antenna 8. It is received by a mobile phone 2 such as an office. The position information is stored in an IC tag (not shown) attached to the detection device. Incidentally, there is no problem even if a notification device different from the detection device 1 is installed and operated according to an instruction from the detection device 1.

  When the mobile phone 2 receives a leak signal, the operator rushes to the site, and performs a search operation to narrow the leak location using the leak detector 9 as shown in FIG. This embodiment shows a case where a leak signal is transmitted from both adjacent detectors 1 and 1 in a portion of the buried pipe P, and an operator detects a leak detector on the ground surface between the detectors 1 and 1. While moving 9, the vibration sound from the pickup 10 attached to the detector 9 that is in contact with the ground is heard, and the locations that can be determined as the water leakage sound are narrowed down. The “squeezing” here does not necessarily mean that the pinpoint leakage position is specified. The vibration sound may be up to the “range” determined to be extremely close to the water leakage sound, and it is only necessary to identify the leaked pipe body including the “range”. For specifying the pipe body, a piping construction diagram, a database of map information, and the like can be used as reference information based on the position of the detection device 1.

  The vibration sound captured by the water leak detector 9 is often judged from the operator's experience as to whether it is a water leak sound. However, a recorded water leak sound sample for each pipe diameter can be carried and compared with it. It is also possible to make a judgment by comparing the frequency of the vibration sound with the machine 9 and the basic data indicating the relationship between the leaked sound for each pipe diameter and the frequency.

  The embodiment shown in FIG. 4 represents a case where a leak signal is transmitted from one detection device 1 in a portion of the buried pipe P. On the ground surface on both sides of the detection device 1, a leak detector is shown. Move 9 and search for the location of water leakage. However, in both of the above embodiments, the water leak detector 9 may have to be moved outside the above range. The search range also changes depending on how much the judgment criterion for water leakage is set in the control circuit, how much the distance between the adjacent detection devices 1 and 1 is set.

  In the above embodiment, the water leakage detection device 1 based on the vibration sound of the pipe is used as the abnormality detection means, and the abnormality information and the abnormality signal are handled as the leakage information and the leakage signal itself, respectively, but the present invention is limited to this. It is not a thing. For example, the abnormality detection means may be one that detects an abnormality based on flow rate detection or water pressure detection. The abnormality signal generated by these devices is regarded as a possibility of a leakage signal, and the abnormality signal is generated. What is necessary is just to search the location, when there exists a water leak, judging the presence or absence of water leak with the water leak detector 9 in the surface of the detection means vicinity. When it is determined that there is no water leakage, it is possible to continuously investigate whether other elements of the piping system are related to the abnormality.

  The fact that both the abnormality detection means and the water leak detector 9 use the vibration sound as the detection object as in the above embodiment has the effect of increasing the accuracy of the presence / absence determination of leakage, and conversely the detection of the abnormality detection means. When the target is other than vibration sound, a wide range of abnormality detection not specified for water leakage is possible. The water leak detector 9 is not limited to the device described in Patent Document 1 as shown in FIGS. 3 and 4 and may be anything as long as it can search for a water leak location from the ground surface. In addition, if a vibration sound is detected, it is easy to share information among workers, which is very convenient.

  In the above embodiment, the receiving means is the mobile phone 2, but it may also be a computer terminal or the like, and is not limited thereto. Further, the buried piping may be for industrial use, agricultural use, etc., other than for water supply, and the material is not particularly limited, such as cast iron, steel, resin.

1. Water leakage detection device (abnormality detection means)
2. Mobile phone (receiving means)
3. 3. Wireless repeater Sensor 5. Control circuit 6. Clock circuit 7. Telephone conversion circuit Antenna 9. Leak detector 10. Pickup Buried piping Fire hydrant T. Bifurcation

Claims (2)

  An abnormality signal composed of abnormality information detected by the abnormality detection means installed in the buried pipe and the position information of the detection means can be automatically transmitted by the abnormality notification means, and the abnormality signal is received by the reception means. A leak detection method for buried pipes, wherein a leak point is searched for while moving a leak detector on the surface of the buried pipe around the detection means. The leak detection method for buried piping according to claim 1, wherein the abnormality detection means and the detection target of the leak detector are the same.

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