Detecting method and instrument for cement road surface plate bottom empty by sound vibration method

Abstract

An acoustic vibrating method for detecting disjointed of cement pavement plate bottom includes transforming sound signal to be frequency domain signal by Fourier transform after sound signal of cement pavement being impacted by drop-hammer is obtained by positioned sound transducer; calculating parameters of power spectrum area, resonant peak frequency, barycenter on X axis direction of power spectrum area, power spectrum area barycenter rounding Y axis and resonant peak amplitude; and utilizing judgment function to carry out judgment for confirming whether cement pavement is disjointed or not.

Description

technical field [0001] The invention relates to a detection technology for voids at the bottom of cement pavement slabs, in particular to a detection method and a detector for voids at the bottom of cement pavement slabs by acoustic vibration method. Background technique [0002] Cement pavement voiding is one of the more difficult diseases to treat in cement pavement diseases. Since the voiding occurs at the bottom of the cement concrete slab, there is no obvious sign on the surface of the pavement, which causes some difficulties in the treatment of voiding. Due to the important influence of void damage on pavement performance, domestic and foreign road workers have done a lot of research on void detection and treatment. At present, the void judgment methods of cement concrete pavement can be mainly divided into the following categories: [0003] (1) Appearance discrimination method [0004] Including manual observation of the vibration of the board when the vehicle passe...

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Problems solved by technology

[0013] Among the above methods, the appearance discrimination method and the manual impact method are simple to operate, have many human factors, poor accuracy, and cannot be quantified; the deflection discrimination method is simple to calculate but the accuracy is not high, and it cannot be accurately quantified. For different structures, it is necessary to correct the void standard, which does not have wide applicability; the results obtained by different inverse calculation programs for the inversion analysis method are not the same; the multi-level load regression method depends on the detection equipment FWD. The detection cost is much higher than other detection methods. In addition, the road sections that need to be paved and reconstructed are mostly road sections that are open to traffic. In order not to affect the traffic, only a section of road with one lane is usually closed when the pavement is added. Due to its large size, FWD is not easy to detect close to traffic. The board angle on one side is not easy to turn around (expressway access control, two-way split driving)

Therefore, there will be a lot of inconvenience in testing and grouting acceptance

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