Calculation Method of Equivalent Pile Diameter in Longitudinal Section for Acoustic Transmission Method in Foundation Pile Inspection
A technology of foundation pile detection and calculation method, which is applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems such as the inability to test the diameter of the pile body, and achieve the effect of easy analysis and judgment, high feasibility, and promotion of development
Inactive Publication Date: 2019-07-23
HUAZHONG UNIV OF SCI & TECH
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[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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[0051] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0052] In theory, the actual diameter of the pile body is consistent with the diameter of the hole and the design diameter of the pile. However, due to the uncertainty of artificial or mechanical construction, the aperture may be too large or too small. Geological soil layers, groundwater, and other factors lead to the collapse of local hole walls, which makes the local diameter of the piles expand...
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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 particularly relates to a method for calculating a pile diameter based on the analysis of the sound wave transmission frequency domain. Background technique [0002] In the process of ultrasonic 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, the lower the porosity, the higher the speed of the sound wave and the strength of the concrete; the sound wave propagates inside the concrete, when it encounters defects (cavities, concr...
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IPC IPC(8): G01B17/06
CPCG01B17/06
Inventor 王雪峰王淼坤谢建伟朱正瞿为朱田戴飞飞朱俊涛
Owner HUAZHONG UNIV OF SCI & TECH