Far field eddy current testing method of pipeline steel wire fracture of prestressed concrete cylinder pipe (PCCP)
A far-field eddy current and detection method technology, applied in the direction of material magnetic variables, can solve the problems of low efficiency and poor precision, and achieve the effects of fast and accurate number and position, fast and accurate detection, and easy detection
Pending Publication Date: 2019-03-22
TIANJIN UNIV
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This method can only identify pipelines in a critical damage state, and relies on the experience of personnel, with low efficiency and poor accuracy
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[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.
[0021] The feature of the far-field eddy current probe is: the far-field eddy current probe is composed of an excitation coil coaxial with the pipeline and connected to a low-frequency AC circuit and a radially distributed detection coil that is three times the inner diameter of the pipe (far-field area) away from the excitation coil. There are two different energy transfer paths from the excitation coil to the detection coil located in the far field region: there is a direct coupling energy propagation path in the tube, and the characteristic of this part of energy is that it decays exponentially with the increase of the distance from the excitation coil; The other part of energy penetrates the tube wall near the excitation coil and is transmitted to the outside of the tube, and...
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The invention discloses a far field eddy current testing method of pipeline steel wire fracture of a prestressed concrete cylinder pipe (PCCP). The method is based on a principle of circumferential magnetization, and comprises the following steps: using an excitation coil arranged along a radial pipeline of the PCCP, introducing a low-frequency alternating current (AC) excitation current in the radial excitation coil, and inducing an alternating magnetic field distributed along the circumference of the pipeline cross section of the PCCP; arranging a detection coil in a far field region, whichis triple pipe diameter away from the excitation coil, and along the radial direction of the pipeline of the PCCP, and using the detection coil to measure an indirect coupled magnetic field signal, wherein the magnetic field signal is used as detection data; recording in an electronic package by means of a data acquisition system; enabling the alternating magnetic field generated by the excitationcoil to have interaction with the pipeline steel wire fracture of the PCCP for affecting amplitudes of the signals received by the detection coil and the phase difference of the detected signal relative to the exciting current so as to realize the detection of the pipeline steel wire fracture of the PCCP. The method provided by the invention can rapidly and accurately realize the number and position detection of the pipeline steel wire fracture of the PCCP.
Description
technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a far-field eddy current testing method for broken steel wires of PCCP pipelines. Background technique [0002] Prestressed steel cylinder concrete pipe (PCCP) is a high-quality water delivery pipe that organically combines the tensile strength of high-strength steel wires, the compression resistance of concrete and the anti-seepage of steel plates, and makes full use of the physical and mechanical properties of the materials. tubing. It has been widely used in the fields of water conservancy, municipal administration and drainage in our country. Among them, the successful application of the east and middle routes of the South-to-North Water Diversion Project and the Wanjiazhai Yellow River Diversion Project in Shanxi Province has made my country's PCCP technology gradually mature. [0003] The strength of PCCP mainly depends on the force condition of the prestr...
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Login to View More IPC IPC(8): G01N27/90
CPCG01N27/90
Inventor 赵铭鑫封皓谢韵博
Owner TIANJIN UNIV