A kind of foundation pile detection control method and device based on gating acoustic wave sensor group

Abstract

The invention discloses a foundation pile detection control device based on gating sonic sensor groups. The device comprises a sonic wave instrument I, a height position encoder FMA and M gating sonic sensor groups S (i), wherein M is larger than or equal to 3 and smaller than or equal to 10, the sonic wave instrument I comprises a computer system C, a control unit P and M receiving channels Tr (i), each gating sonic sensor group S (i) comprises a transmitting and receiving duplexing sensor Sd (i), N receiving sensors Sr (ij), a sensor gating module SC (i), an amplification module G (i) and a sonic wave transmitter F (i), and N is larger than or equal to 1 and smaller than or equal to 9. The invention further discloses a foundation pile detection control method based on the gating sonic sensor groups. By means of the foundation pile detection control method and device based on the gating sonic sensor groups, the number of reception channels of detection equipment and the cost of the detection equipment are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of detecting the integrity of foundation piles by applying acoustic wave transmission tomography in the field of geotechnical engineering detection, and specifically relates to a foundation pile detection control device based on a gating acoustic wave sensor group, and also relates to a device based on selection Foundation pile detection method through acoustic wave sensor group. Background technique [0002] Testing the Integrity of Foundation Pile by Acoustic Transmission Method [0003] The sound wave transmission method is used to detect the integrity of the poured foundation pile. Before pouring concrete, M (2≤M) acoustic measuring tubes parallel to each other should be placed on the reinforcement cage of the foundation pile. The length of the acoustic measuring tube is equal to the length of the pile. (The length of the reinforcement cage) is the same. After the concrete pouring of the pile body is co...

AI Technical Summary

Problems solved by technology

However, the technical characteristics of using M×(N+1) receiving channels and M acoustic wave transmitters in this patented technology to increase the speed of the sensor are very uneconomical, and the large increase in the number of channels leads to increased instrument noise, increased crosstalk between channels, and power consumption. Increased power, increased volume, increased failure rate, and increased difficulty in production, reducing the field applicability of the detection device

[0011] In essence, the sensor group placed in an acoustic tube in the invention patent with the patent application number CN201110212064.4 and the invention patent with the patent application number CN201410002896.7 is a simple combination of multiple commonly used sensors, and the existing problems are all The reason is that the number of cable cores is too many, resulting in an increase in the outer diameter and weight of the cable. In the actual on-site inspection, the cable often reaches more than 100 meters. The weight of the cable affects portability. If the outer diameter of the control cable does not increase, the core The diameter of the wire is limited, resulting in increased attenuation of the core wire. At the same time, too many core wires also lead to increased interference between channels, which all lead to a decrease in detection performance.

And the number of signal lines connecting each sensor group to the acoustic wave instrument is fixed. When it is necessary to increase the number of receiving sensors in the gated acoustic wave sensor group, it will face incompatibility problems

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