Signal acquisition device and method for nondestructive testing of quality of multi-defect long anchor cable

Abstract

The invention discloses a multi-azimuth signal acquisition device and method suitable for nondestructive testing of the quality of a multi-defect long anchor cable. The device comprises an excitation hammer, a plurality of anchor cable sensors, a data acquisition instrument, a power supply, a memory and a computer, the plurality of anchor cable sensors are sequentially installed at the exposed end of each anchor cable steel strand; the signal output end of each anchor cable sensor is connected with the signal input end of the data acquisition instrument, the signal output end of the data acquisition instrument is connected with the memory and the computer, and the power supply is connected with the data acquisition instrument. According to the invention, a multi-azimuth superposition type acquisition technology is adopted, weak signals can be effectively acquired, the effective weak signals are identified and extracted from complex fluctuation signals, and the wave velocity of each section can be accurately calculated through multi-azimuth acquisition, so that a plurality of defect positions are identified, and the anchoring quality of the anchor cable is accurately evaluated.

Description

technical field [0001] The invention relates to the technical field of elastic wave vibration detection using geophysics, in particular to a signal acquisition device and method for quality non-destructive testing of multi-defect long anchor cables. Background technique [0002] Prestressed anchor cable anchoring technology has been widely used in engineering, and has become the main support method of rock and soil reinforcement engineering. The prestressed anchor cable refers to the cable-shaped support that anchors the anchor cable inside the rock mass by means of prestressing. The anchor head is anchored into the rock mass through the drill hole on the weak structural surface of the rock mass, and the unstable rock mass and the stable rock mass are connected together. Together, the stress state of the rock mass can be changed, and the integrity and strength of the unstable rock mass of the slope can be improved. From the definition of the anchor cable, it can be seen tha...

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Problems solved by technology

[0012] The purpose of the present invention is to provide a signal acquisition device and method for the quality non-destructive testing of multi-defect long anchor cables, which can solve the problems of low collection efficiency and large stress wave attenuation in the existing multi-defect long anchor cable quality non-destructive testing. Multi-directional signal collection and rapid anchor cable data superposition can improve the efficiency of multi-defect long anchor cable quality non-destructive testing and reduce safety risks

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