Method of detecting the integrity of high cap piles under existing structures by virtual isolated single pile method

Abstract

The invention discloses a method for detecting the completeness of a high bearing platform pile under an existing structure object by a virtual isolation single pile method. The method specifically comprises the following steps of firstly, collecting data, secondly, analyzing collected data through the virtual isolation single pile method and thirdly, judging the completeness of the high bearing platform pile. Two positions with a certain distance are selected on the upper portion of a tested foundation pile in the longitudinal direction of a pile body for conducting shock excitation, an actually-measured impedance function combining with the virtual isolation single pile method is used for calculating the impedance function of the pile tops of single piles under the two positions, and then the completeness of the pile body is analyzed. According to the method, under the condition that the upper portion structure and the pile body are not damaged, the influence of the upper portion structure on detecting of the completeness of the pile body is completely eliminated, a pile to be detected is 'isolated' from a complex structure, the single pile after isolation can be easily analyzed and evaluated referring to a traditional mechanical impedance method or a reflected wave method or other analysis methods, the difficulty of the problem is greatly lowered, and the reliability of detected results is improved.

Description

technical field [0001] The invention relates to a technology for detecting the integrity of a high cap pile under an existing structure, in particular to a method for detecting the integrity of a high cap pile under an existing structure by a virtual isolated single pile method. Background technique [0002] High cap pile foundation is a common foundation form in bridges, docks and other projects. In recent years, natural disasters have occurred frequently in various countries around the world. After each large-scale disaster such as destructive earthquakes, landslides, and tsunamis, many bridges, The wharf will be damaged and damaged in different degrees, and these damages and damages will not only occur in the structure of the bridge and the upper part of the wharf, but also in the foundation part of the lower part. On the other hand, because some of the pile foundations of high-cap pile foundations such as bridges and wharf piles are exposed on the ground, they are easily...

AI Technical Summary

Problems solved by technology

[0003] The routine detection methods of foundation pile quality include single pile static load test, low strain reflection wave method, acoustic wave transmission method, and drilling coring method. When using conventional detection methods, the pile top is usually required to be a free end. Pile, the conventional method is difficult to operate

In addition, for the side hole transmitted wave method for the detection of existing building foundation piles, holes need to be drilled near the pile side and each pile needs to detect dozens or even hundreds of measuring points, the detection efficiency is relatively low, and the cost Higher, not suitable for large-scale quality surveys, especially for docks and bridge piles on water, the actual operation is difficult, and for longer piles, the inclination of the borehole will lead to unreliable test results

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