Equidistant three-point seismic prospecting method for detecting deeply-buried nonmetallic pipeline
A non-metallic and seismic wave technology, applied in the field of detection, can solve the problems of positioning and depth determination without non-metallic pipelines, and achieve the effects of shortening measurement time, accurate measurement results and convenient operation
Active Publication Date: 2012-02-15
CHINA RAILWAY DESIGN GRP CO LTD
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Problems solved by technology
The detection of non-metallic pipelines buried deep and without inspection wells is a difficult problem for geophysical prospecting workers. At present, there is no ability to locate and determine the depth of non-metallic pipelines
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[0028] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be noted that the embodiments are illustrative, not restrictive, and cannot limit the protection scope of the present invention.
[0029] An equidistant three-point seismic wave method for detecting deep-buried non-metallic pipelines, comprising the following steps:
[0030] (1) Set three equidistant measuring points perpendicular to the direction of the detected pipeline 3, and measure the distance between two adjacent measuring points (that is, the distance between single-point reflection points) as d;
[0031] (2) A sensor 2 is buried on the ground 1 of the three measurement points, and a hammer is used to tap next to the three sensors, and the one-way time from the three measurement points to the pipeline is obtained by the test instrument as t 1 , t 2 , t 3 , the test instrument can be a seismometer or an elastic wave tester or a geo...
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The invention relates to an equidistant three-point seismic prospecting method for detecting a deeply-buried nonmetallic pipeline, which comprises the following steps of: firstly, arranging three equidistant measuring points in a trend perpendicular to a detected pipeline and measuring the space d between two measuring points; secondly, respectively burying a sensor on the grounds where the threemeasuring points are positioned, respectively knocking besides the three sensors by using a hammer and obtaining the single-trip times t1, t2 and t3 between the three measuring points and the pipeline by using a testing apparatus (such as a seismograph); thirdly, measuring to obtain the speed v of a primary seismic wave of a soil layer above the pipeline; and fourthly, calculating by using a formula to obtain the position and the buried depth of the pipeline. The equidistant three-point seismic prospecting method for detecting the deeply-buried nonmetallic pipeline which is disclosed by the invention is scientific in design, convenient in operation and easy in grasp. According to the detection method, the nonmetallic pipeline can be quickly positioned; the depth of the nonmetallic pipeline can be quickly determined; the detection difficulty is reduced; the detection efficiency and the accuracy of the detection result are improved; and the technical blank in the field of detection of the nonmetal pipelines is filled up.
Description
technical field [0001] The invention relates to the field of detection methods, in particular to an equidistant three-point seismic wave method for detecting deep-buried non-metallic pipelines. Background technique [0002] Since non-metallic pipelines do not have the ability to conduct electricity and magnetic conductivity, electromagnetic induction detection methods and magnetic methods: such as direct connection method, clamp method, active source induction method, passive source search method, magnetic field strength method, magnetic gradient method Other main pipeline detection methods have no effect on non-metallic pipelines. At present, the detection of non-metallic pipelines is still based on investigation, supplemented by direct methods such as opening manhole observation. The detection of non-metallic pipelines buried deep and without inspection wells is a difficult problem for geophysical prospecting workers. At present, there is no ability to locate and determin...
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Inventor 裴世建郝明辛民高陈露露李志华
Owner CHINA RAILWAY DESIGN GRP CO LTD