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A method of pipeline detection

A detection method and pipeline technology, applied in geophysical measurement, instruments, etc., can solve the problems of lack of tracer lines and electronic tags, and the inability to detect underground pipelines

Active Publication Date: 2021-12-28
核工业二0八大队 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, most of the PE pipes actually constructed in the early years lacked complete tracer lines and electronic tags, and the electromagnetic and electronic tag detection methods still cannot detect underground pipelines.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Before starting to explore the survey area, pre-set the equipment and conduct a consistency test to ensure that the instruments and equipment used meet the detection accuracy requirements.

[0032] After the on-site calibration is completed, the calibration results should be evaluated. When the calibration results all meet the following conditions, the detector can be put into production.

[0033] Positioning error δts: ≤±0.2h;

[0034] Fixed depth error δth: ≤±0.25

[0035] Note: ①h is the buried depth of the center of the underground pipeline, in centimeters;

[0036] ② When h<100cm, substitute h=100cm into the calculation. (Instrument calibration accuracy and self-inspection accuracy requirements must be higher than acceptance excavation requirements)

[0037] The second part, underground pipeline exploration

[0038] The detection of underground pipelines can be divided into field investigation and instrument detection according to its working mode. Combining o...

Embodiment 2

[0067] Applied to the pre-set data obtained in the early stage in embodiment 1, the method in embodiment 2 is the active sound source detection method combined with the brazing method to solve the buried pipe detection, especially suitable for PE pipes.

[0068] Step 1. The audio transceiver selects a frequency between 200HZ-1000HZ, sends an audio signal, and the receiver in the audio transceiver receives the signal, searches and records the position of the strongest signal, and uses the position to make a parabolic selection of detection points for detection , when the signal strength connection line of the selected detection point presents a quasi-parabolic shape, and when the point is determined to be the real strongest signal point position, the circular point with the strongest signal position and a radius of 3-5 meters are used to perform circular detection ;

[0069] Specifically: the audio transceiver selects a frequency between 200HZ-1000HZ, sends an audio signal, the...

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Abstract

The invention discloses an active sound source method combined with a brazing method to detect and verify buried gas medium-pressure and low-pressure pipe networks, adjust the strength of received signals by means of depth data of valve wells and brazing, and obtain The location information data of the pipeline and the timely generation of GIS data will bring convenience to the data management of the pipeline network of gas enterprises, and also provide a strong guarantee for the city's digitalization and informatization.

Description

technical field [0001] The invention belongs to the detection field of gas pipelines, and aims to solve the data integrity problem of gas pipeline networks. Background technique [0002] The construction of domestic urban gas pipeline network has a history of nearly a hundred years, and most urban gas enterprises were founded in the 1970s. Affected by the construction conditions, technology, and equipment at that time, urban fuel enterprises have the problem of missing completion data to varying degrees. For example, China Resources Gas Group has about 100,000 kilometers of buried pipeline networks, and about one-third of the data is expected to be improved in terms of spatial information and attribute information. [0003] Buried pipe network materials mainly include cast iron pipes, steel pipes, PE pipes, etc. After decades of operation and development, cast iron pipes have basically been modified and withdrawn from application; the detection technology for steel pipes h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 段桂英李喜彬冯来明宋勇张九源薛伟戴明建李华明齐彥宏孙长亮覃宗耀
Owner 核工业二0八大队
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