WO2024252621A1 - Procédé d'inspection pour pipeline enterré souterrain - Google Patents

Procédé d'inspection pour pipeline enterré souterrain Download PDF

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Publication number
WO2024252621A1
WO2024252621A1 PCT/JP2023/021363 JP2023021363W WO2024252621A1 WO 2024252621 A1 WO2024252621 A1 WO 2024252621A1 JP 2023021363 W JP2023021363 W JP 2023021363W WO 2024252621 A1 WO2024252621 A1 WO 2024252621A1
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WO
WIPO (PCT)
Prior art keywords
pipeline
database
propagation
waves
camera
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.)
Pending
Application number
PCT/JP2023/021363
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English (en)
Japanese (ja)
Inventor
花絵 大谷
友規 村上
元晴 佐々木
千尋 鬼頭
大輔 内堀
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/JP2023/021363 priority Critical patent/WO2024252621A1/fr
Priority to JP2025525866A priority patent/JPWO2024252621A1/ja
Publication of WO2024252621A1 publication Critical patent/WO2024252621A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more

Definitions

  • This disclosure relates to technology for estimating conditions inside pipelines buried underground.
  • Fiber optic cables are installed on utility poles or in conduits, and are provided from station buildings to individual homes, etc.
  • Non-Patent Document 1 Previously, pipe cameras were used to check for abnormalities in pipes to check the state of continuity (see, for example, Non-Patent Document 1).
  • Visual continuity inspections using cameras can visually check for the presence of obstacles in the pipeline, but there is a problem in that it is difficult to determine what type of obstacle is present just by looking. In particular, because the water that has entered the pipeline is mixed with soil and sand, there is a problem in that it is difficult to determine the presence of rust inside the pipeline.
  • the purpose of this disclosure is to make it possible to estimate the conditions inside a pipeline.
  • Obstacles in pipelines can be soil, water, or rust.
  • the behavior of radio waves, sound waves, light, etc. in pipelines where such obstacles exist varies and can be measured in advance. Therefore, this disclosure makes it possible to estimate the condition inside the pipeline based on at least one of the propagation characteristics and reflection characteristics inside the pipeline.
  • the system disclosed herein includes a database that stores at least one of the propagation characteristics and reflection characteristics within a pipeline for each type of obstacle present within the pipeline, and a computing device that estimates the condition within the pipeline based on the database, and executes the method disclosed herein.
  • the system of the present disclosure may include a measuring device that measures the propagation characteristics or reflection characteristics within the pipeline.
  • the computing device may estimate the condition within the pipeline by comparing the measurement results from the measuring device with the database.
  • the database may store the propagation or reflection characteristics of at least one of radio waves, sound waves, or light waves.
  • the database may store the propagation or reflection characteristics of a plurality of different frequencies.
  • the types of obstacles may include at least one of soil, water, and rust.
  • the system disclosed herein includes a transmitting device that transmits radio waves, and the measuring device receives the radio waves transmitted from the transmitting device.
  • the transmitting device may transmit multiple radio waves with different frequencies.
  • the measuring device may receive multiple radio waves with different frequencies.
  • the system disclosed herein includes a transmitting device that transmits sound waves, and the measuring device receives the sound waves transmitted from the transmitting device.
  • the transmitting device may transmit multiple sound waves with different frequencies.
  • the measuring device may receive multiple sound waves with different frequencies.
  • the system disclosed herein includes a transmitting device that transmits light waves, and the measuring device receives the light waves transmitted from the transmitting device.
  • the transmitting device may transmit multiple light waves with different frequencies.
  • the measuring device may receive multiple light waves with different frequencies.
  • the system disclosed herein may include a camera capable of capturing images of the inside of the pipeline, and a display device that displays the images captured by the camera and the estimation results of the computing device.
  • the system disclosed herein may include a transmitting device that transmits at least one of radio waves, sound waves, and light waves, and the transmitting device may be mounted on the camera.
  • This disclosure makes it possible to estimate the conditions inside a pipeline.
  • 1 is an example embodiment of a system of the present disclosure. An example of a method for estimating the state inside a pipeline will be described. An example of information stored in the database is shown below. 1 is an example embodiment of a system of the present disclosure. 1 is an example embodiment of a system of the present disclosure.
  • FIG. 1 shows an example of a system configuration of this embodiment.
  • the system of this embodiment includes a transmitting device 91, a receiving device 92, a computing device 93, and a display device 95.
  • the transmitting device 91 is a device that transmits radio waves continuously or periodically.
  • the receiving device 92 is a device that receives radio waves and functions as the "measuring instrument" of this disclosure.
  • the computing device 93 is a device that estimates the state inside the pipeline 82 based on the reception result of the receiving device 92.
  • the display device 95 is a device that displays the determination result of the determination device 93.
  • the display device 95 may be provided in the determination device 93.
  • FIG. 2 shows an example of a method for estimating the state inside a pipeline.
  • S11 A transmitting device 91 and a receiving device 92 are installed in manholes 81-1 and 81-2 located at both ends of a pipeline 82.
  • S12 The transmitter 91 transmits radio waves toward the pipeline 82.
  • S13 The receiving device 92 receives the radio waves from the pipeline 82. As a result, the receiving device 92 receives the radio waves that have passed through the pipeline 82.
  • S14 The receiving device 92 outputs the reception result to the calculation device 93.
  • the reception result of the receiving device 92 is, for example, the reception strength of the radio wave.
  • the radio waves transmitted and received in steps S12 and S13 are, for example, radio signals of different frequency bands.
  • the transmitting device 91 transmits radio signals of frequency bands of 5 GHz, 30 GHz, and 60 GHz, which have different degrees of attenuation in water.
  • the frequency band of the radio waves may be selected according to the diameter of the pipe 82; for example, the larger the diameter, the lower the frequency band that is used.
  • the propagation attenuation of radio waves according to the type and amount of obstacles 70, such as dirt, water, and rust, present in the pipeline 82 is measured in advance and stored in a database provided in the computing device 93.
  • a database provided in the computing device 93.
  • four patterns of measurement results are stored in advance for each frequency: received power when the obstacle 70 is dirt and corrosion (rust), received power when the obstacle 70 is corrosion (rust) and water, received power when the obstacle 70 is dirt and water, and received power when the obstacle 70 is dirt, corrosion (rust) and water.
  • the computing device 93 refers to the database, combines the measurement results of steps S11 to S14, and estimates the type of obstacle 70 that may be present in the pipeline 82, such as dirt, water, and rust. As a result, the type of obstacle 70 that may be present in the pipeline 82 is displayed on the display device 95.
  • the calculation device 93 may estimate the amount of obstacles 70 in addition to the type of obstacles 70.
  • the calculation device 93 may also estimate the percentage of the cavity in the pipeline 82 that is occupied by obstacles 70. Furthermore, for each type or combination of obstacles 70, it may be defined that a certain percentage or more of the obstacles 70 present in the pipeline 82 must exist to cause non-conduction. The calculation device 93 may then calculate the percentage probability of non-conduction based on the signal reception strength.
  • the computing device 93 may determine the pipeline 82 with the highest conductivity possibility based on the reception strength and the amount of each obstacle 70. For example, when there is an equal amount of soil, water, and rust, the pipeline 82 with water may be selected as the pipeline with the highest conductivity possibility.
  • steps S12 to S14 may be repeated from the installation of the transmitting device 91 and the receiving device 92 (S11).
  • a signal other than radio waves such as sound waves or light
  • the position of the transmitting device 91 and the receiving device 92 may be swapped and measurements may be performed again.
  • the reflection characteristics reflected within the pipeline 82 may be measured.
  • the system of this embodiment can classify and determine the quantity of obstacles in the pipeline 82 from a combination of the strengths of the received signals of multiple signals acquired using the receiving device 92, without using a pipe camera. Therefore, the system of this embodiment can easily perform continuity inspections and inspections of the condition inside the pipeline.
  • the system of the present disclosure may include a blower and an anemometer.
  • the blower is used to send air into the duct 82 from the transmitting device 91 side
  • the anemometer is used to measure wind force on the receiving device 92 side, and the measurement result is output to the computing device 93. This can improve the estimation accuracy in the computing device 93.
  • the system of the present disclosure may also include a blower, an anemometer, and a thermometer.
  • the blower is used to send hot air from the transmitting device 91 into the duct 82
  • the thermometer is used to measure the temperature on the receiving device 92 side
  • the anemometer is used to measure the wind force, and these measurement results are output to the computing device 93. This can improve the estimation accuracy in the computing device 93.
  • the system of this embodiment includes a pipe camera 94 in addition to the configuration of the first embodiment.
  • An image captured by the pipe camera 94 is transmitted to a calculation device 93 and displayed on a display device 95.
  • the system of this embodiment allows the image of the inside of the pipeline 82 captured by the pipe camera 94 to be viewed on the display device 95.
  • Inspection of the pipeline 82 using the pipe camera 94 is performed, for example, before steps S11 to S14 in the first embodiment. At this time, if the type of obstacle 70 cannot be determined, the type of obstacle 70 can be estimated by performing steps S11 to S14 in the first embodiment.
  • (Fourth embodiment) 5 shows an example of the system configuration of this embodiment.
  • the transmitter 91 of the first embodiment is mounted on the tip of a pipe camera 94.
  • the accuracy of classifying and measuring the quantity of obstacles 70 in the pipeline 82 can be improved by combining the images from the pipe camera 94 and the reception results of multiple signals acquired using the receiving device 92.
  • the arithmetic device 93 of the present invention can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided via a network.
  • the program of the present disclosure is a program for causing a computer to realize each function of the arithmetic device 93 according to the present disclosure, and is a program for causing a computer to execute each procedure of the method executed by the arithmetic device 93 according to the present disclosure.

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  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

La présente divulgation concerne un système comprenant : un instrument de mesure qui mesure des vibrations qui peuvent se propager à travers un pipeline ; et un dispositif arithmétique qui estime un état dans le pipeline sur la base des résultats de la mesure par l'instrument de mesure.
PCT/JP2023/021363 2023-06-08 2023-06-08 Procédé d'inspection pour pipeline enterré souterrain Pending WO2024252621A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2023/021363 WO2024252621A1 (fr) 2023-06-08 2023-06-08 Procédé d'inspection pour pipeline enterré souterrain
JP2025525866A JPWO2024252621A1 (fr) 2023-06-08 2023-06-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/021363 WO2024252621A1 (fr) 2023-06-08 2023-06-08 Procédé d'inspection pour pipeline enterré souterrain

Publications (1)

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WO2024252621A1 true WO2024252621A1 (fr) 2024-12-12

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JP (1) JPWO2024252621A1 (fr)
WO (1) WO2024252621A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019138862A (ja) * 2018-02-15 2019-08-22 三菱電機株式会社 レーダ信号処理装置
JP2022161052A (ja) * 2021-04-08 2022-10-21 パナソニックＩｐマネジメント株式会社 超音波流量計

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019138862A (ja) * 2018-02-15 2019-08-22 三菱電機株式会社 レーダ信号処理装置
JP2022161052A (ja) * 2021-04-08 2022-10-21 パナソニックＩｐマネジメント株式会社 超音波流量計

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