Low-strain double-speed signal averaging detection method for building hollow pile

Abstract

The invention provides a low-strain double-speed signal averaging detection method for a building hollow pile. The low-strain double-speed signal averaging detection method for the building hollow pile is applied to a pile body of the building hollow pile. The method comprises the steps of determining a knocking point on the surface of the pile top of the building hollow pile; arranging two or more signal acquisition devices on the surface of the pile top of the building hollow pile as measurement points for the pile body of the hollow pile, wherein an included angle of 45 degrees is formed between the position where one of the signal acquisition devices is arranged and the knocking point, and an included angle of 135 degrees is formed between the position where the other signal acquisition device is arranged and the knocking point; when knocking action at the knocking point is received, obtaining a measurement point signal from each signal acquisition device, and obtaining a double-speed test curve containing all the measurement point signals; and conducting averaging processing on the double-speed curve, so that a detection result of the pile body of the building solid pile is obtained. By means of the detection result obtained through the detection method, compared with an existing sampling method, pile body integrity of the pile body of the building hollow pile can be judged more accurately.

Description

technical field [0001] The invention relates to the field of building detection, in particular to a low-strain double-velocity signal average detection method for building hollow piles. Background technique [0002] The existing common hollow pile low-strain detection method applies low-energy transient percussion on the surface of the pile top, and the shock wave generated by the percussion propagates downward along the pile body, and will generate Reflected wave, according to the signal characteristics of the reflected wave to determine the quality of the pile body. [0003] At present, there are some problems in the existing hollow pile low strain detection detection scheme: [0004] Hollow piles cannot be struck in the middle of the pile because the middle of the pile is hollow and there is no concrete. The load and foundation pile constitute an eccentric striking system. Under the action of transient percussion load, the hollow pile body not only produces longitudinal...

AI Technical Summary

Problems solved by technology

The current research and sampling methods have not deeply considered how to eliminate the three-dimensional interference signal generated at the top of the foundation pile and the eccentric moment shear wave propagating along the pile body

[0005] 2. For square and polygonal hollow piles, there is currently no clear low-strain test plan

[0006] 3. With the increase of the pile diameter or the decrease of the load pulse width, the distribution law of the strength of the three-dimensional interference signal between different measuring points on the top surface of the hollow pile changes. The three-dimensional interference signal at 90° is relatively smaller than the measuring points at other positions, but with the increase of pile diameter, the three-dimensional interference signal at 90° from the knocking point is significantly larger than the measuring points at other positions, so the existing technology is The scheme of sampling at 90° to the knocking point is not suitable for the case of large pile diameter or small load pulse width, that is, the existing method is not generally applicable to hollow piles with different parameters

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