Longitudinal section equivalent pile diameter calculation method for foundation pile detection acoustic transmission method

Abstract

The invention belongs to the field of engineering measurement and discloses a longitudinal section equivalent pile diameter calculation method for a foundation pile detection acoustic transmission method. The longitudinal section equivalent pile diameter calculation method comprises the following steps: measuring a real-time acoustic signal of each point of a section in sequence by adopting a low-pass acquisition technology and a wide frequency band receiving technology, so as to obtain a section wave velocity change diagram; carrying out Fourier transformation to obtain a section acoustic signal frequency spectrum diagram; calculating pre-estimated characteristic frequency of each point according to the wave velocity change diagram and a designed pile diameter; searching actual characteristic frequency close to the pre-estimated characteristic frequency of each point to be detected from the frequency spectrum diagram; calculating the pile diameter of each measured point of the section according to the section wave velocity change diagram and an actual characteristic frequency marking diagram, so as to obtain a pile diameter change diagram of each measured point of the section; comparing and averaging the pile diameters obtained by different measuring lines on the same cross section, so as to obtain an average equivalent pile diameter of the section; constructing a new section equivalent pile diameter change diagram and drawing an equivalent pile diameter depth-dependent change curve. By adopting the method provided by the invention, the vacancy of pile diameter detection of a concrete grouting pile in a pile foundation detection industry is made up.

Description

technical field [0001] The invention belongs to the field of engineering measurement, and more specifically relates to a method for calculating pile diameter based on sound wave transmission frequency domain analysis. Background technique [0002] During the process of ultrasonic waves passing through the concrete medium, the performance and structure of the medium itself will affect various acoustic parameters of the acoustic signal. At this stage, the acoustic parameters generally investigated in concrete quality testing include wave velocity, amplitude, frequency and waveform. [0003] Changes in wave speed: Sound waves travel at different speeds in concrete with different materials. In general, the denser the internal structure of the concrete medium, the higher the elastic modulus, and the lower the porosity, the higher the wave velocity of the sound wave and the strength of the concrete; , necking, local looseness, etc.), when receiving waves, it is larger than the n...

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Problems solved by technology

[0008] In view of the above defects or improvement needs of the prior art, the present invention provides a method for calculating pile diameter based on sound wave transmission frequency domain analysis. Technical issues with actual pile diameter

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