Rockbolt length ultrasonic guide-wave detecting instrument

Abstract

An ultrasonic guided wave detector for detecting length of anchor bolt is prepared as connecting arbitrary function generator to change - over switch through power amplification module, connecting change - over switch to guide wave transmitting - receiving element and gain amplification module, connecting gain amplification module to waveform analysis and display module.

Description

technical field [0001] The invention relates to an ultrasonic guided wave detector for the length of a bolt. The device measures the length of a bolt embedded in a medium (such as soil, cement, resin and rock) by using an ultrasonic guided wave nondestructive detection technology, and belongs to the field of nondestructive detection. Background technique [0002] Water conservancy and hydropower projects, urban construction, highway and railway construction and other projects use a large number of bolt support technology (that is, the bolt is buried in the rock or soil to enhance the support capacity of the rock or soil). Due to the harsh working environment, such as moisture, humid air, rain and other liquids infiltrated into the metal anchor, the stress concentration caused by local corrosion of the anchor results in the breakage of the anchor; or due to the lateral sliding of the soil and rock layers , so that the stress state of the anchor rod changes, from the axial ten...

AI Technical Summary

Problems solved by technology

Due to the harsh working environment, such as moisture, humid air, rain and other liquids infiltrated into the metal anchor, the stress concentration caused by local corrosion of the anchor results in the breakage of the anchor; or due to the lateral sliding of the soil and rock layers , so that the stress state of the anchor rod changes, from the axial tensile stress to the transverse shear stress, and finally the anchor rod is sheared and fails

In order to seek improper benefits, individual construction parties often shorten the length of the bolt without authorization, so that it cannot reach the designed bearing strength, causing potential accidents to geotechnical engineering

Due to the strong concealment of these methods, it is very difficult to effectively detect them.

[0003] The existing bolt detector adopts the audio frequency stress wave detection method, the detection waveform is relatively messy, difficult to identify, has the disadvantages of poor repeatability and low detection accuracy, and cannot meet the actual engineering detection needs

Therefore, an ultrasonic guided wave non-destructive testing method can be used. This method requires the design of a special device, which has not been seen so far.

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