A method for foundation pile detection
A foundation pile detection and foundation pile technology, which is applied in foundation structure engineering, foundation structure test, construction, etc., can solve problems such as differences in stress wave propagation speed
Active Publication Date: 2021-05-14
HUBEI UNIV OF ARTS & SCI
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Problems solved by technology
In the process of foundation pile inspection, the propagation time of stress wave can be directly measured, however, the propagation speed of stress wave in different piles is very different
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[0062] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0063] One, the principle derivation of foundation pile detection method of the present invention:
[0064] 1. Stress wave velocity formula in foundation pile
[0065]Reasons such as the construction quality of foundation piles will cause discontinuous structural surfaces such as honeycombs, holes, and even large cracks inside the foundation piles. The existence of discontinuous structural surfaces will cause losses inside the foundation pile concrete. As we all know, the damage evolution of concrete has fractal characteristics. Based on fractals and damage mechanics, the method of the present invention creatively proposes a "bridge-type" damage variable D that connects the macroscopic and meso...
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The invention discloses a foundation pile detection method, comprising the following steps: setting a sensor on the top of the pile, hammering the pile head around the sensor, and recording the stress wave waveform of the foundation pile at each knocking time by using a foundation pile dynamic tester; Select a feasible waveform from the stress wave waveform of a foundation pile test for analysis, and divide the reflected wave peak at the defect of the foundation pile by the first incident wave peak generated by hammering to obtain the stress wave reflection coefficient; The fractal dimension value of the foundation pile is obtained by inversion calculation of the reflection coefficient formula at the structural surface; the fractal dimension value of the foundation pile is used as a quantitative index to measure the integrity of the foundation pile. Based on the fractal dimension value and the derived wave velocity formula, the wave velocity is accurately calculated, and then the pile length is accurately calculated. The quantitative evaluation index fractal value of the pile integrity in this method overcomes the imprecise problem of the classification methods of I, II, III, and IV in the code; in addition, the proposal of the precise wave velocity calculation method overcomes the problem of calculating wave velocity and pile in the code. Long inaccurate defects.
Description
technical field [0001] The invention relates to a foundation pile detection method, which belongs to the technical field of building detection. Background technique [0002] The existing foundation pile detection code proposes a set of pile integrity judgment method and pile length calculation theory. For the classification of pile body integrity, the code divides piles into Class I piles, Class II piles, Class III piles, and Class IV piles. Seriously flawed. This approach has at least two inherent flaws. In the actual inspection project, how to distinguish the status of minor defects, obvious defects and serious defects? Without a quantitative index, inspectors can only roughly judge based on their own experience. Obviously, the pile body integrity classification method given by the code is not operable, and the empiricism is serious. ) The integrity of multiple piles is also very different, and it is too rough to classify them in the same category. [0003] For pile l...
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IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 李业学
Owner HUBEI UNIV OF ARTS & SCI