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WO2021220371A1 - Système d'inspection de canalisation, dispositif d'inspection de canalisation et procédé d'inspection de canalisation - Google Patents

Système d'inspection de canalisation, dispositif d'inspection de canalisation et procédé d'inspection de canalisation Download PDF

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Publication number
WO2021220371A1
WO2021220371A1 PCT/JP2020/018028 JP2020018028W WO2021220371A1 WO 2021220371 A1 WO2021220371 A1 WO 2021220371A1 JP 2020018028 W JP2020018028 W JP 2020018028W WO 2021220371 A1 WO2021220371 A1 WO 2021220371A1
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WO
WIPO (PCT)
Prior art keywords
sound wave
piping
pipe
sound
piping inspection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/018028
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English (en)
Japanese (ja)
Inventor
稔久 藤原
幸嗣 辻
一貴 原
亮太 椎名
央也 小野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to PCT/JP2020/018028 priority Critical patent/WO2021220371A1/fr
Priority to JP2022518465A priority patent/JP7380855B2/ja
Publication of WO2021220371A1 publication Critical patent/WO2021220371A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations

Definitions

  • This disclosure relates to the inspection of the normality of the laid pipe and the measurement of the flow rate in the pipe.
  • Non-Patent Document 1 describes the possibility that the leaking sound can be discriminated by frequency analysis. Further, Non-Patent Document 2 describes the possibility that dark water sound and water leakage sound can be separated by chaos theory.
  • Non-Patent Document 3 a method of determining the water leakage location by reading the change of the pressure waveform in the pipeline due to the water hammer action has been proposed (see, for example, Non-Patent Document 3). ).
  • Non-Patent Documents 1 and 2 may lead to the automation of judgment by human hearing, the hearing itself must be carried out in the vicinity of the leaked part. However, there is a problem that it is difficult to significantly reduce the labor of inspection.
  • Non-Patent Document 3 The method using water hammer proposed in Non-Patent Document 3 generates water hammer by opening and closing a valve downstream from the leaking part, and measures each tributary in order to read the change in water pressure of the water flow system. Is required, and there is a problem that it is difficult to drastically reduce the labor of measurement. Furthermore, the proposal of Non-Patent Document 3 is premised on agricultural water supply, and there is also a problem that it is difficult to install a valve that causes water hammer in individual households and business establishments in ordinary water supply. In addition, the proposal of Non-Patent Document 3 has a problem that it is difficult to implement because the stable water supply itself of the water supply may be hindered by water hammer.
  • An object of the present invention is to provide a piping inspection system, a piping inspection device, and a piping inspection method that can be used in waterworks and can perform intensive automatic measurement in order to solve the above problems.
  • the piping inspection system applied sound waves to the laid pipes and analyzed the sound waves returning from the pipes.
  • the piping inspection system according to the present invention is arranged in a laid pipe, transmits a pulse sound wave to the pipe, receives a return sound wave returning from the pipe by transmitting the pulse sound wave, and receives the return sound wave.
  • a piping inspection device for acquiring the distribution of the level of the return sound wave in the longitudinal direction of the piping is provided.
  • the piping inspection device is a piping inspection device arranged in the laid pipes.
  • a transmitter that transmits pulsed sound waves to the pipe
  • a receiving unit that receives the return sound wave returned from the pipe by transmitting the pulsed sound wave
  • An analysis unit that acquires the distribution of the level of the return sound wave in the longitudinal direction of the pipe, and It is characterized by having.
  • the piping inspection method according to the present invention is a piping inspection method for inspecting laid pipes. Sending pulsed sound waves to the pipe, To receive the return sound wave returning from the pipe by transmitting the pulse sound wave, and to obtain the distribution of the level of the return sound wave in the longitudinal direction of the pipe. It is characterized by performing.
  • a water pipe inspection device is installed between the water pump of the water distribution system and the water pipe, pulse sound waves are transmitted to the downstream side of the water pipe, and reflected sound from the downstream side is received. , Detects the presence or absence of water leakage and the location of water leakage from the time change of the received reflected sound.
  • the present invention can provide a piping inspection system, a piping inspection device, and a piping inspection method that can be used in waterworks and can perform intensive automatic measurement.
  • the piping inspection system further includes a reflecting device arranged in the piping, receiving the pulse sound wave, and transmitting an arbitrary sound wave as the return sound wave in the direction of receiving the pulse sound wave of the piping. It is characterized by.
  • the piping inspection system according to the present invention is characterized in that the piping inspection device has a bandpass filter that selects the arbitrary sound wave transmitted by the reflection device from the return sound wave.
  • the return sound wave can be separated into a naturally reflected sound wave and a sound wave from a reflecting device.
  • the piping inspection system according to the present invention is further provided with a time synchronization function for synchronizing the time between the piping inspection device and the reflection device. It is possible to measure the flow velocity and flow rate between the water pipe inspection device and the reflection device.
  • the piping inspection device of the piping inspection system detects the flow velocity at the location of the piping where the return sound wave is generated from the difference between the frequency of the pulse sound wave and the frequency of the return sound wave other than the arbitrary sound wave. It is characterized by further providing a flow velocity detection function. The flow velocity and flow rate at a desired point can be measured only with a water pipe inspection device.
  • the present invention can provide a piping inspection system, a piping inspection device, and a piping inspection method that can be used in waterworks and can perform intensive automatic measurement.
  • FIG. 1 is a diagram illustrating the piping inspection system 301 of the present embodiment.
  • the pipe inspection system 301 is arranged in the laid pipe 50, transmits a pulse sound wave to the pipe 50, receives a return sound wave returning from the pipe 50 by transmitting the pulse sound wave, and returns the return sound wave in the longitudinal direction of the pipe 50.
  • the piping inspection device 10 for acquiring the distribution of sound wave levels is provided.
  • the water pipe inspection device 10 is installed between the water supply pump 20 and the water pipe 50.
  • the water pipe inspection device 10 includes a transmitting unit 11 that generates a pulsed sound wave and a receiving unit 12 that receives a pulsed sound wave (return sound wave) generated by the water pipe 50.
  • the water pipe inspection device 10 can also be installed in the water pipe 50 away from the water supply pump 20. In addition to the permanent installation, the water pipe inspection device 10 can be installed so as to temporarily contact the water pipe 50 and the plug at the time of measurement.
  • the water pipe inspection device 10 can identify those points by the reception time of the return sound wave reflected at the diversion point, the bend point, or the water leakage point of the water pipe 50.
  • the water pipe inspection device 10 can calibrate the distance of the reflection point of the measurement result based on the reflection point whose distance from itself is known.
  • the water pipe inspection device 10 can suppress dark water noise by numerical processing such as averaging and improve the accuracy of pipe inspection. Further, the water pipe inspection device 10 can improve the accuracy of the pipe inspection by reducing the influence of the dark water sound by frequency-separating the return sound waves.
  • audible sound waves For pulsed sound waves, audible sound waves, ultrasonic waves, or both can be used. Further, by using a plurality of frequencies for the pulsed sound wave, the properties of the reflected portion can be separated.
  • the water pipe inspection device 10 can separate the diversion and the water leakage of the water pipe 50 by transmitting pulse sound waves of a plurality of frequencies.
  • the pipe inspection system 301 is further provided with a reflecting device R arranged in the pipe 50, receiving the pulse sound wave, and transmitting an arbitrary sound wave as the return sound wave in the direction of receiving the pulse sound wave of the pipe 50. And. As shown in FIG. 1, a plurality of reflectors R can be installed in the path of the water pipe.
  • the reflector R can be retrofitted not only inside the water pipe 50 but also outside the water pipe 50.
  • the reflecting device R can not only reflect the pulsed sound wave as it is, but also respond as another sound wave having a different frequency or the like.
  • the pipe inspection device 10 further has a flow velocity detection function for detecting the flow velocity at the location of the pipe 50 where the return sound wave is generated from the difference between the frequency of the pulse sound wave and the frequency of the return sound wave other than the arbitrary sound wave. Be prepared.
  • the pipe inspection device 10 can measure the flow velocity in the vicinity of the reflection point by the Doppler shift of the reflected sound from the water flow itself in the water pipe or the fluid such as air bubbles other than the reflection device R. Further, the piping inspection device 10 can obtain the flow rate based on the time integration of the flow velocity.
  • FIG. 2 is a diagram for explaining a pulse sound wave transmitted by the piping inspection device 10.
  • the pulsed sound wave is composed of a mark sound and silence as shown in FIG.
  • the mark sound transmission time is defined as the mark time Tm
  • the silent space time is defined as Ts.
  • the mark sound can be time-shaped with a humming window, a humming window, etc. Thereby, the high frequency component can be suppressed and the frequency of the transmitted sound wave can be limited.
  • Tm can be a sufficiently short time within the length that the sound wave frequency can be discriminated from. By lengthening Tm, it becomes easier to separate the frequency from the dark water sound. On the other hand, by shortening Tm, the resolution of the distance of the reflection point is improved. On the other hand, Ts is a time during which the reverberation of the reflected sound becomes sufficiently small. The piping inspection device 10 returns to this space time and measures the sound wave.
  • the mark sound can also be multitone.
  • the mark sound of 1 can be set to multitone, but the tone can be changed for each repeated mark sound. It is also possible to change the multitone signal for each mark sound.
  • the mark sound can also be a modulated signal to which information such as the mark transmission time is added.
  • digital modulation such as FSK (Frequency Shift Keying), ASK (Amplitude Shift Keying), and OFDM (Orthogonal Frequency Division Multiplexing) can be used.
  • the piping inspection device 10 acquires a return sound wave after the mark time Tm, and monitors the elapsed time from the end of the mark sound and the sound pressure level thereof.
  • the reflector R can reflect the mark sound as it is, but it can also reflect it as a sound wave having a frequency different from that of the mark sound (hereinafter referred to as the reflector sound).
  • the reflector sound By using the reflector R, the reception level of the reflector sound in the water pipe inspection device 10 can be set to a sufficient level so as not to be buried in the dark water sound.
  • the reflector sound emitted by the reflector R can be a sound wave obtained by converting the mark sound level, frequency, or waveform when the mark sound reaches the reflector R.
  • the reflector R can make the transmission level of the reflector sound proportional to the reception level of the mark sound.
  • the reflector R can make the transmission frequency of the reflector sound proportional to the reception frequency of the mark sound.
  • the reflector R can make the transmission time of the reflector sound proportional to the reception time of the mark sound.
  • the elapsed time of the reflector sound received by the water pipe inspection device 10 increases and the reception level decreases as the reflector R becomes farther away. Further, when the mark sound reflected by other than the reflecting device R can be detected, the water pipe inspection device 10 acquires the reflected sound generated at a place where the water pipe 50 is divided, bent, leaked, or has other changes in the water flow. Can be done. Further, the water pipe inspection device 10 can also determine a decrease in the sound pressure level of the return sound wave reflected far away from the place where the water flow changes. The water pipe inspection device 10 detects water leakage by utilizing the level difference between the reflection device sound and the mark sound (naturally reflected sound) reflected by other than the reflection device R. If the naturally reflected sound has a sufficient sound pressure level, the reflecting device R may not be used.
  • FIG. 3 is a diagram illustrating a return sound wave received by the water pipe inspection device 10.
  • FIG. 3A is a case where there is no water leakage
  • FIG. 3B is a case where there is water leakage.
  • the naturally reflected sound of the returned sound waves is indicated by a solid line
  • the reflecting device sound is indicated by a dashed line. If there is a leak, the portion reflecting the state changes in the (P L), by comparing the difference between the sound pressure levels before and after, it is possible to detect the water leakage.
  • the reflecting device R When separating the naturally reflected sound and the reflecting device sound as shown in FIG. 3, for example, the reflecting device R outputs the reflecting device sound having a frequency different from the frequency of the pulsed sound wave transmitted by the water pipe inspection device 10. If the naturally reflected sound and the reflecting device sound have different frequencies as shown in FIG. 4, the water pipe inspection device 10 can remove frequencies other than the desired frequency with a band passing filter that extracts only each frequency.
  • the band-passing filter makes it difficult for the reflected sound of the mark sound to be buried in the dark water sound, and the water pipe inspection device 10 can increase the sensitivity of the naturally reflected sound.
  • the frequency band of the band-passing filter is set in consideration of the doppler shift of the frequencies of the mark sound, the naturally reflected sound, and the reflecting device sound due to the water flow.
  • the water pipe inspection device 10 repeatedly measures the natural reflection sound and the reflection device sound and executes arithmetic processing such as averaging processing to make the natural reflection sound and the reflection device sound less likely to be buried in the dark water sound.
  • arithmetic processing such as averaging processing to make the natural reflection sound and the reflection device sound less likely to be buried in the dark water sound.
  • the reception sensitivity can be increased.
  • the piping inspection system 301 can properly use the reflection device R for each branch line and perform piping inspection for each branch line. For example, the piping inspection system 301 can inspect the state of the branch line 50-1 of the water pipe when the reflection device R4 is not used. Further, the piping inspection system 301 can inspect the state of the branch line 50-2 of the water pipe when the reflectors R2 and R3 are not used.
  • the water pipe inspection device 10 can determine the state of the water pipe 50 near the reflection point by comparing the reflection frequency characteristics of the multitones.
  • the piping inspection system 301 is further provided with a time synchronization function for synchronizing the times of the piping inspection device 10 and the reflection device R.
  • the time synchronization function can synchronize the time between the water pipe inspection device 10 and the reflection device R.
  • the time synchronization function is GNSS (Global Navigation Satellite System).
  • GNSS Global Navigation Satellite System
  • the water pipe inspection device 10 measures the Doppler shift of the reflected sound from other than the reflection device R (for example, the water flow itself in the water pipe or a fluid such as air bubbles), and measures the flow velocity in the vicinity of the reflection point. You can also. This is because part of the naturally reflected sound includes reflection by fluid in the water pipe.
  • the water pipe inspection device 10 can obtain the flow rate by integrating the flow velocity over time.
  • the water pipe inspection device 10 can find a leak point from a plurality of flow velocity information, a diversion state, and a water pipe diameter measured by the above method. For example, when the flow velocities of the reflectors R2 and R3 are known and the water pipe diameters of the reflectors R2 and R3 are the same, the flow velocities of the reflectors R2 and R3 are the same because there is no branch between them. However, when water leakage occurs, the flow velocity of the reflecting device R3 becomes slower than the flow velocity of the reflecting device R2 by the amount of the leaked flow rate. Therefore, when the flow velocity of the reflecting device R3 is slower than that of the reflecting device R2, the water pipe inspection device 10 can determine that there is water leakage between the reflecting devices R2 and R3.
  • FIG. 5 is a functional block diagram illustrating the configuration of the reflection device R.
  • the reflection device R includes a transmission unit 21, a reception unit 22, a bandpass filter 23, a level monitor 24, a control unit 25, and a signal generation unit 26.
  • the reflector R of FIG. 5 can transmit a reflector sound having a frequency different from the frequency of the received mark sound wave.
  • the transmitting unit 21 converts the signal of the signal generating unit 26 into sound waves and emits it as a reflector sound in the water in the water pipe 50.
  • the transmitting unit 21 may be composed of a plurality of sound wave transmitting elements.
  • the signal generation unit 26 generates a signal according to an instruction from the control unit 25.
  • the receiving unit 22 receives the mark sound wave in the water in the water pipe 50.
  • the sound waves of the space time may be selectively received according to the instruction from the control unit 25.
  • the band-passing filter 23 can selectively pass the frequency of the mark sound and the frequency in consideration of the Doppler shift thereof. As the bandpass filter 23, in addition to an analog filter, a digital processing filter after digital sampling of audio can also be used.
  • the level / waveform monitor 24 can sweep and monitor the signal from the band pass filter 23 with the elapsed time from the end of the mark sound transmission from the water pipe inspection device 10.
  • the level / waveform monitor 24 can transmit the sound pressure level, frequency, detection time, etc. of the mark sound to the control unit 25.
  • the reflection device R synchronizes the time with the water pipe inspection device 10 and manually or automatically acquires the transmission time of the mark sound of the water pipe inspection device 10 from the water pipe inspection device 10. You can know the end time of the mark sound transmission.
  • the control unit 25 controls the above-described operation, processes necessary for signal generation, gives instructions to other functional units, and collects information from the other functional units.
  • the control unit 25 can also acquire the time from GNSS or the like.
  • FIG. 6 is also a functional block diagram illustrating the configuration of the reflection device R.
  • the reflection device R of FIG. 6 has a transmitting unit 21, a receiving unit 22, a bandpass filter 23, and a gain controller 27.
  • the reflector R of FIG. 6 emits a reflector sound having the same frequency as the received mark sound wave.
  • the gain controller 27 can adjust the gain of the signal from the bandpass filter 23.
  • Other functional parts are the same as the reflector R of FIG.
  • FIG. 7 is a functional block diagram illustrating the configuration of the water pipe inspection device 10.
  • the water pipe inspection device 10 is a pipe inspection device arranged in the laid pipe 50, and is a pipe inspection device.
  • a transmitter 11 that transmits pulsed sound waves to the pipe 50
  • the receiving unit 12 that receives the return sound wave returning from the pipe 50 by transmitting the pulsed sound wave
  • An analysis unit 17 that acquires the distribution of the level of the return sound wave in the longitudinal direction of the pipe 50, It is characterized by having.
  • the water pipe inspection device 10 includes a receiving unit 12, a bandpass filter (13-1, 13-2), a level monitor (14-1, 14-2), a spectrum analysis function unit 17, and a transmitting unit 11. , A signal generation unit 16, and a control unit 15.
  • the transmitting unit 11 converts the signal of the signal generating unit 16 into a sound wave and transmits it as a pulse sound wave into the water in the water pipe 50.
  • the transmitting unit 11 may be composed of a plurality of sound wave transmitting elements.
  • the signal generation unit 16 generates a signal of an arbitrary pulse sound wave having a mark sound and a space time according to an instruction from the control unit 15.
  • the receiving unit 12 receives the sound waves in the water in the water pipe 50. In particular, the sound waves of the space time may be selectively received according to the instruction from the control unit 15.
  • the band-passing filters (13-1 and 13-2) can selectively pass the frequencies of the mark sound and the reflector sound and the frequencies in consideration of the Doppler shift thereof, respectively.
  • a digital processing filter after digital sampling of audio can also be used. It may be adaptively filtered by the instruction from the control unit 15.
  • the level monitors (14-1, 14-2) can sweep and monitor the signals from the band-passing filters (13-1, 13-2) with the elapsed time from the end of the mark sound transmission, respectively.
  • the level monitor (14-1, 14-2) can also monitor the averaging, the maximum value, and the minimum value by repeated measurement. For averaging, power averaging, arithmetic averaging, logarithmic averaging and the like can be used. Further, the sweep timing can be instructed by the control unit 15. Further, the measured value of the sweep result can be transferred to the control unit 15.
  • the spectrum analysis function unit 17 can analyze the spectrum accompanying the time change by a bandpass filter (13-1, 13-2) or a short-time Fourier transform of the signal from the receiving unit 12.
  • the spectrum analysis function unit 17 can estimate the flow velocity from the Doppler shift between the frequency of the mark sound transmitted from the transmitting unit 11 and the frequency of the naturally reflected sound received by the receiving unit 12 by this analysis. Further, the spectrum analysis function unit 17 can estimate the flow velocity according to the distance from the water pipe inspection device 10 by collating the reception time of the return sound wave with the elapsed time after the end of the mark sound transmission. Further, the spectrum analysis function unit 17 can perform the analysis based on an instruction from the control unit 15. Further, the spectrum analysis function unit 17 can also transfer the measured value of the analysis result to the control unit 15.
  • the control unit 15 controls the above-mentioned operation, processes necessary for signal generation, gives an instruction to another functional unit, and collects information from the other functional unit.
  • the control unit 15 can also acquire the time from GNSS or the like.
  • FIG. 8 is a diagram illustrating a transmitting unit and a receiving unit arranged in the water pipe 50.
  • the water pipe inspection device 10 and the reflection device R may also include a plurality of sound wave transmitting elements constituting the transmitting unit (11, 21) and a plurality of sound wave receiving elements constituting the receiving unit (12, 22). Further, as shown in FIG. 8, the transmitting unit and the receiving unit can be installed at a distance in the longitudinal direction of the water pipe 50.
  • the transmitting unit (11, 21) can transmit a sound wave in an arbitrary direction by shifting the transmission phase of the sound wave for each sound wave transmitting element when transmitting the sound wave. For example, when the water pipe inspection device 10 tries to measure the return sound wave from the downstream of the water pipe 50, if the pulse sound wave is also transmitted to the upstream side of the water pipe 50, the return sound wave from the upstream and the return sound wave from the downstream It becomes impossible to distinguish from the return sound wave of. Therefore, the water pipe inspection device 10 adjusts the transmission phase of the sound wave for each sound wave transmission element of the transmission unit 11, and sets the transmission direction of the pulse sound wave only downstream. As a result, the return sound wave from the upstream can be suppressed.
  • the receiving units (12, 22) can selectively receive sound waves in any direction by adding the received signals of each sound wave receiving element with a phase shift when receiving sound waves.
  • the water pipe inspection device 10 intends to measure the return sound wave from the downstream side of the water pipe 50, when it receives the sound wave from the upstream side of the water pipe 50, it receives the sound wave from the upstream side and the return sound wave from the downstream side. It becomes impossible to distinguish. Therefore, the water pipe inspection device 10 shifts the phase of the received signal received by the sound wave receiving element of the receiving unit 12 and adds them so that the sound wave receiving direction is only downstream. As a result, the influence of sound waves from the upstream can be suppressed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Pipeline Systems (AREA)

Abstract

L'objectif de la présente invention est de fournir un système d'inspection de canalisation, un dispositif d'inspection de canalisation et un procédé d'inspection de canalisation pouvant être utilisés pour un système d'adduction d'eau et rendant possible une mesure automatique centralisée.　Un système d'inspection de canalisation selon la présente invention comprend un dispositif d'inspection de canalisation (10) qui est disposé sur une canalisation (50) posée, émet une onde sonore pulsée dans la canalisation (50), reçoit une onde sonore de retour renvoyé depuis la canalisation (50) suite à l'émission de l'onde sonore pulsée, et acquiert une distribution du niveau d'onde sonore de retour le long de la direction longitudinale de la canalisation (50). Le système d'inspection de canalisation émet une onde sonore pulsée vers le côté aval de la canalisation d'eau, reçoit un son réfléchi en provenance du côté aval, et détecte la présence ou non d'une fuite et l'emplacement de la fuite à partir du changement temporel du son réfléchi reçu. Le système d'inspection de canalisation permet à une canalisation d'être inspectée de manière centrale à partir d'un emplacement sans nécessiter la visite du site par un ouvrier.
PCT/JP2020/018028 2020-04-27 2020-04-27 Système d'inspection de canalisation, dispositif d'inspection de canalisation et procédé d'inspection de canalisation Ceased WO2021220371A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2020/018028 WO2021220371A1 (fr) 2020-04-27 2020-04-27 Système d'inspection de canalisation, dispositif d'inspection de canalisation et procédé d'inspection de canalisation
JP2022518465A JP7380855B2 (ja) 2020-04-27 2020-04-27 配管検査システム、配管検査装置、及び配管検査方法

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PCT/JP2020/018028 WO2021220371A1 (fr) 2020-04-27 2020-04-27 Système d'inspection de canalisation, dispositif d'inspection de canalisation et procédé d'inspection de canalisation

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240230454A1 (en) * 2022-03-29 2024-07-11 Michael Pieneman System and method for determining the location of a leak within a longitudinal pipe

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07198528A (ja) * 1993-12-28 1995-08-01 Tokyo Gas Co Ltd ガス漏洩検出装置
JPH10132541A (ja) * 1996-10-25 1998-05-22 Tokyo Gas Co Ltd 音波式管路調査方法
JPH11132896A (ja) * 1997-10-31 1999-05-21 Osaka Gas Co Ltd 浸水状態検査方法及び検査装置
JP2001343266A (ja) * 2000-04-24 2001-12-14 Chang Min Tech Co Ltd 超音波流速測定装置
WO2002021120A1 (fr) * 2000-09-04 2002-03-14 The Nippon Signal Co., Ltd. Systeme de detection de defauts
JP2009198388A (ja) * 2008-02-22 2009-09-03 Tokyo Electric Power Co Inc:The 超音波流量計
JP2016136103A (ja) * 2015-01-23 2016-07-28 横河電機株式会社 超音波流量計

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07198528A (ja) * 1993-12-28 1995-08-01 Tokyo Gas Co Ltd ガス漏洩検出装置
JPH10132541A (ja) * 1996-10-25 1998-05-22 Tokyo Gas Co Ltd 音波式管路調査方法
JPH11132896A (ja) * 1997-10-31 1999-05-21 Osaka Gas Co Ltd 浸水状態検査方法及び検査装置
JP2001343266A (ja) * 2000-04-24 2001-12-14 Chang Min Tech Co Ltd 超音波流速測定装置
WO2002021120A1 (fr) * 2000-09-04 2002-03-14 The Nippon Signal Co., Ltd. Systeme de detection de defauts
JP2009198388A (ja) * 2008-02-22 2009-09-03 Tokyo Electric Power Co Inc:The 超音波流量計
JP2016136103A (ja) * 2015-01-23 2016-07-28 横河電機株式会社 超音波流量計

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240230454A1 (en) * 2022-03-29 2024-07-11 Michael Pieneman System and method for determining the location of a leak within a longitudinal pipe

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JPWO2021220371A1 (fr) 2021-11-04

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