Method for determining pile length and defect depth of existing project under urban update

The method of collecting and fitting pile body transmitted waves and pile bottom reflected waves through the side hole transmission wave method solves the problem of difficulty in determining pile bottom and defect depth in the prior art, and achieves high-precision pile length and defect depth detection.

CN119711561APending Publication Date: 2025-03-28SHANGHAI URBAN CONSTR VOCATIONAL COLLEGE +1
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Patent Information

Application Number
CN202411815592.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

It is difficult to effectively determine the intersection points between the pile body fitting line and the pile bottom fitting line, especially when the pile body wave velocity is close to the foundation wave velocity, it is difficult to accurately determine the pile bottom depth and defect depth.

Method used

The side hole transmission wave method is used to collect the pile body transmission wave and the pile bottom reflected wave by excitation on the top of the support platform, and perform linear fitting to determine the fitted straight line. The pile length and defect depth are analyzed by the intersection of the two fitted lines.

Benefits of technology

This method can accurately determine the pile length and defect depth when the hole depth does not need to exceed the expected pile bottom, and is not limited by pile shapes and materials. It is suitable for various pile shapes and materials, improving the accuracy and reliability of detection.

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Abstract

The invention discloses a method for determining the pile length and defect depth of an existing project under urban renewal, and belongs to the technical field of project piles. The method comprises the ground and a bearing platform, the bearing platform is constructed above the ground or buried or partially buried under the ground, and the bottom of a pile body penetrates and extends to the inner side of the bottom of the bearing platform; a sleeve is installed in the ground in a penetrating mode, the top of the sleeve is open, a detector is put down through an orifice, and the top end of the detector is connected with a signal analyzer through a wire harness. According to the method for determining the pile length and the defect depth of the existing project under urban updating, vibration excitation is conducted on the side face of a foundation or the top of a bearing platform or a structure, a detector is arranged in a measuring hole near a pile to be measured to collect pile body transmission waves, and the pile length and the pile body integrity can be analyzed according to signal first arrival wave characteristics; according to the method, two fitting lines can be respectively determined through a side hole transmission wave directly reaching a pile body and a side hole transmission wave reflected by a pile bottom or a defect, and the pile length or the defect position is determined through the intersection point of the two fitting lines.
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