A detection method for prestressed anchor cable pipeline grouting
A technology of prestressed anchor cables and detection methods, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, etc., can solve the problems of unrecognizable recording signal sources, difficult positioning, signal attenuation, etc., and achieve high-precision non-destructive testing of grouting quality, The effect of avoiding ambiguity and improving reliability
Inactive Publication Date: 2016-01-20
CENT SOUTH UNIV
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Problems solved by technology
The detection methods currently used include elastic wave method or ultrasonic method, which are often single-point single-scan detection. There are three major problems that have not been solved. One is that it is difficult to detect effective signals due to signal attenuation; The judgment and positioning of the defect position are often inaccurate; third, because the projection of the formed anchor cable pipeline itself on the concrete surface is not a straight line, it is difficult to directly locate it using the single-point acquisition mode
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[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0029] see figure 1 To realize a method for detecting the grouting quality of prestressed anchor cable pipelines, a group of linear sensor arrays 1 with a distance of 5 to 20 cm are formed by a plurality of speed or acceleration sensors, and they are placed on the concrete surface perpendicular to the extension direction of the anchor cable pipeline 2 to be detected. The coupling is fixed, the sensor output signal is connected to the input end of the multi-channel elastic wave recording instrument 5 through the multi-channel signal cable 4, the seismic source 6 excites the elastic wave on the anchor cable end 3, and the excitation synchronization signal is connected to the multi-channel elastic wave recording instrument through the signal line 7. Wave recording instrument 5 synchronous trigger input port. The seismic source excites elastic wa...
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The invention discloses a method for detecting the grouting quality of a prestressed anchor cable pipeline. A plurality of speed or acceleration sensors form a linear sensor array (1), and the sensor array (1) coupled and fixed on the surface of concrete in an extending direction vertical to an anchor cable pipeline (2) to be detected, the sensors are connected with the input end of a multi-pass elastic wave recorder (5), a vibration source (6) stimulates an elastic wave on an anchor cable end head (3), a stimulation synchronization signal is connected to the multi-pass elastic wave recorder (5), the vibration source stimulates the elastic wave, the multi-pass elastic wave recorder (5) records a multi-pass elastic wave; the sensor array (1) is fixed and coupled on the surface of the concrete for one time to record one group of multi-pass elastic wave records, and the linear sensor array moves in parallel for one space along the extending direction of the anchor cable pipeline and is coupled and fixed with the surface of the concrete to obtain multi-pass elastic wave records of different positions along the extending direction of the anchor cable pipeline. According to the method, the accuracy of detection positions and characters of grouting hidden dangers can be improved.
Description
technical field [0001] The invention relates to a method for detecting the grouting of a prestressed anchor cable pipeline, and the method of the invention is also applicable to the detection of the anchoring quality of various anchor rods and anchor cables. technical background [0002] At present, the lack of compact grouting of prestressed anchor cable pipes is a common quality problem that often occurs in the grouting construction of prestressed tunnels, which seriously affects the survival life of prestressed structures. When there are serious problems in the grouting quality of the tunnel, due to the corrosion of the steel bars, the bridge may be damaged or even collapsed after a period of time after the bridge is completed. How to make the prestressed pipe grouting dense and full has become an important problem faced by both design and construction. The detection methods currently used include elastic wave method or ultrasonic method, which are often single-point sin...
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IPC IPC(8): G01N29/04
Inventor 朱德兵田忠涵赵亚杰杨益成刘卫强夏娴肖龙英刘炳佳
Owner CENT SOUTH UNIV