Sound wave detection control method and device

Abstract

The invention discloses a sound wave detecting control method and device. The steps include: A, setting a control unit; B, setting a height of the current detecting point and beginning to synchronously lift wave sound sensors; C, reading the height positions of the wave sound sensors S1, Sm; D returning to the step C if the height position does not reach the height of the current detecting point; E, carrying out sub-processes of emitting and receiving with a number of M-1; F, transferring the data recorded into step E to a computer system; G, calculating a new height of the current detecting point; H, returning to step C if the height of the current detecting point is not higher than the height of the top of a foundation pile; finishing when the height of the current detecting point is higher than the height of the top of the foundation pile. The device consists of N receiving-emitting convertible wave sound sensors S1, Sn; N receiving-emitting convertible channels Ch1, Chn, a computer system CPU, a control unit CPLD and a height position coder FMA. The device can finish the detecting work of all the section planes formed by M sound detecting pipes in the pile foundation during a lifting detecting process and have a high detecting efficiency.

Description

technical field [0001] The invention belongs to the technical field of applying the acoustic wave transmission method to detect the integrity of foundation piles in the field of geotechnical engineering detection, in particular to an acoustic wave detection control method, and also to an acoustic wave detection control device. Background technique [0002] Integrity of foundation piles detected by acoustic transmission [0003] The integrity of cast-in-place piles should be detected by the acoustic wave transmission method in geotechnical engineering. Before pouring concrete, M (2≤M) acoustic measuring tubes parallel to each other should be pre-placed on the reinforcement cage of the foundation pile, and the length of the acoustic measuring tube should be Consistent with the length of the pile (the length of the reinforcement cage), after the concrete pouring of the pile body is completed, the acoustic measuring tubes are embedded in the pile body, and the i-th (1≤i≤M) acous...

AI Technical Summary

Problems solved by technology

[0015] (2) The number of lifting detection processes; usually the length of the connecting cable between the acoustic wave sensor and the acoustic wave instrument is tens of meters or even hundreds of meters, and each lifting detection process needs to move and place the sound wave between different acoustic measuring tubes. sensor, inconvenient

This channel switching method has relatively large defects: 1) one transmission only corresponds to one reception, and the work efficiency is low; 2) the acoustic wave sensor is switched by a single-pole 3-throw relay switch, which relies on the mechanical movement of the contacts After the switching is completed, the relay switch is easy to be damaged; 3) When the acoustic wave sensor is switched from the transmitting state to the receiving state, the acoustic wave sensor must be switched to the short-circuit state first. At this time, the high voltage charged by the transmitter in the acoustic wave sensor (usually Hundreds of volts) instantaneous mechanical switch to short circuit, the contacts in the relay switch will spark, which will affect the service life of the relay switch; the above-mentioned 1), 2), and 3) defects lead to the invention based on the patent application number 02147760.4 The working efficiency of the advanced technology is not high enough, and the acoustic wave instrument is easy to be damaged, which cannot meet the demand of the huge detection workload in the detection of the acoustic wave transmission method; it is also the limitation of the above three defects of 1), 2), and 3), and there is currently no See practical products that apply this technology

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