Operation period underground pipeline pipe diameter measuring method based on ground penetrating radar

A technology of underground pipelines and ground penetrating radar, which is applied in the direction of electromagnetic wave detection to achieve the effect of preventing damage

Inactive Publication Date: 2014-03-26
NANJING UNIV OF TECH
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Problems solved by technology

So as to solve the problem of non-excavation, non-disturbance detection and interpretation of underground pipe

Method used

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  • Operation period underground pipeline pipe diameter measuring method based on ground penetrating radar
  • Operation period underground pipeline pipe diameter measuring method based on ground penetrating radar
  • Operation period underground pipeline pipe diameter measuring method based on ground penetrating radar

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Embodiment Construction

[0027] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] To verify the reliability of the new method of measuring the diameter of underground pipelines by "three-point fixed circle", combined with the radar detection project of the sewage pipe network system in Yixing Chemical Industry Park, the buried depth of underground pipelines in the detection area ranges from 0.5 to 4m. The SIR-20 ground penetrating radar developed and produced by GSSI Company of the United States is used for on-site radar detection. According to the corresponding relationship between detection depth and antenna frequency, antennas with center frequencies of 100MHz and 400MHz are selected. Two typical detection sections are selected for introduction and analysis. Table 1 shows the measured pipe diameters of the two typical sections and the error between them and the actual value.

[0029] Table 1 Probing Pipe Diamete...

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Abstract

The invention provides an operation period underground pipeline pipe diameter measuring method based on a ground penetrating radar. The principle is that a ground penetrating radar electromagnetic wave reflection mechanism and a pipeline special circular shape are used for achieving underground pipeline pipe diameter detecting and interpreting under the non-excavation and non-disturbance situation when an operation period pipeline of an underground pipeline is filled with lossy dielectric. The implementation steps are that (1) on the basis that underground pipeline trend, burial depth, corresponding earth surface positions and proper radar frequency spectrum parameters are determined, ground penetrating radar detecting is carried out, and radar images of three measuring points in a radar measuring line direction above the pipeline are obtained by measuring; (2) on the basis of radar image denoising processing, electromagnetic wave single-track oscillographs corresponding to the coordinates of the three measuring points are extracted; (3) electromagnetic wave transmission time from the three measuring points to a pipe wall is determined through a single-track wave curve peak-valley value; (4) on the basis that field electromagnetic wave speed is determined, the transmission distance between the three measuring points and the pipe wall is obtained; and (5) the coordinates of the three measuring points and the electromagnetic wave transmission distance between the three measuring points and the pipe wall are used for computing the pipeline pipe diameter.

Description

technical field [0001] The invention belongs to the field of geophysical testing, and relates to a method for measuring the diameter of an underground pipeline in an operation period based on a ground-penetrating radar. During the operation period of the underground pipeline, the pipeline is full of lossy media (water, oil, gas), making it difficult to detect the electromagnetic reflection wave at the junction of the pipe bottom, soil and pipe. A method for non-excavation and non-disturbance on-site detection and interpretation of underground pipeline diameters is proposed. Background technique [0002] Ground penetrating radar as an emerging geophysical testing method. It consists of several parts such as antenna, transmitter, receiver, signal processor and terminal equipment. The working mechanism of ground-penetrating radar in detecting underground pipelines is as follows: According to the propagation characteristics of electromagnetic waves in lossy media, ground-penet...

Claims

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Application Information

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IPC IPC(8): G01V3/12
Inventor 张鹏马彬董韬王旭东
Owner NANJING UNIV OF TECH
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