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

A speed signal and detection method technology, applied in the field of building detection, can solve the problems of not considering eccentric knocking, not considering how to eliminate three-dimensional interference signals and eccentric shear waves, etc., to achieve accuracy and completeness, and eliminate three-dimensional interference signals Effect

Active Publication Date: 2017-01-11
荣垂强 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current low-strain vertical eccentric percussion scheme, eccentric percussion is not considered, let alone how to eliminate the special three-dimensional interference signal and eccentric shear wave caused by eccentric percussion.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 1 It is a schematic flow chart of a low-strain double-velocity signal average detection method for building solid piles in the present invention. The low-strain double-velocity signal average detection method of the solid pile of the building is applied to the solid pile of the building, and the method includes the following steps:

[0043] In step S11, a knocking point is set on the top surface of the solid pile body of the building.

[0044] Specifically, the solid pile of the building is a solid circular foundation pile, and the knocking action is vertical knocking with a force hammer or a force rod, and the knocking point can be located at any position on the surface of the pile top, including the center of the pile.

[0045] In an embodiment of the present invention, the solid circular foundation pile body of the building. The percussion point is located at 0.75R on the pile top surface (see image 3 ).

[0046] In an embodiment of the present invention,...

Embodiment 2

[0058] figure 2 It is a structural schematic diagram of a low-strain dual-velocity signal average detection method for building solid piles in the present invention. In this embodiment, the building solid pile is a solid circular foundation pile.

[0059] The vibration excitation device 200 generates an eccentric knocking action at any point on the pile top surface of the solid pile 100. Under the condition that the Poisson's ratio of the pile body concrete is unknown, the radius between the pile top surface of the building solid pile 100 and the knocking point is At (0.67-0.5υ) R on the two radii of 45° and 135°, install two signal acquisition devices 300 as the measuring points for the solid pile body of the building, where υ is the concrete Poisson of the pile body Ratio, R is the radius of the foundation pile. Under the condition that the concrete Poisson's ratio of the pile body is known, the two signal acquisition devices are installed at 2 / 3 of the steel cage radius ...

Embodiment 3

[0069] Figure 7 It is a structural schematic diagram of an alternative scheme of a low-strain double-velocity signal average detection method for building solid piles in the present invention. In this embodiment, the solid pile of the building is a circular pile with a solid section. Specifically:

[0070] Under the condition that the concrete Poisson's ratio of the pile body is known, the vibration excitation device 200 produces an eccentric knocking action at (0.67-0.5υ)R on the pile top surface of the solid pile 100 of the building at any radius, where υ is the pile Poisson's ratio of the body concrete, R is the radius of the foundation pile; under the condition that the Poisson's ratio of the pile body concrete is unknown, the excitation device 200 is placed at 2 / 3 of the radius of the reinforcement cage on the pile top surface of the solid pile 100 of the building position produces an off-center tapping action. On the pile top surface of the solid pile 100 of the buil...

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Abstract

The invention provides a low-strain double-speed signal averaging detection method for a building solid pile. The low-strain double-speed signal averaging detection method for the building solid pile is applied to a pile body of the common building solid pile. The method comprises the steps of conducting knocking at any point on the surface of the pile top of the building solid pile; under the conditions that the concrete Poisson ratio of the pile body is already known and the concrete Poisson ratio of the pile body is not known, arranging two signal acquisition devices according to different situations correspondingly; when knocking action at the knocking point is received, obtaining measurement point signals from both signal acquisition devices at the same time, 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 method, the selection scope of the knocking point is remarkably enlarged; and by means of the obtained detection result, pile body integrity of the pile body of the building solid 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 solid piles. Background technique [0002] The existing common low-strain detection method of foundation pile 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 low-strain detection scheme of solid circular foundation piles: [0004] First of all, for the low-strain detection of solid circular foundation piles, existing foundation pile detection specifications and most researches use pile center tapping, but the pile center is only a very special point on the top surface of the pile, and the pile cente...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 荣垂强黄玮黄茜黄涛
Owner 荣垂强
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