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Method for detecting quality of existing building foundation piles with parallel seismic method

A technology of side-hole transmission waves and existing buildings, which is applied in the fields of buildings, infrastructure tests, infrastructure engineering, etc., can solve the problems of impossible direct contact with piles, and achieves easy popularization, clear and reliable principles, and intuitive and simple methods. Effect

Inactive Publication Date: 2009-11-04
浙江省建筑科学设计研究院有限公司
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Problems solved by technology

These conventional detection methods need to directly contact the foundation pile or the top of the pile, but since the upper building structure already exists at this time, it is almost impossible to directly contact the top of the pile, and the conventional foundation pile detection method is powerless

Method used

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  • Method for detecting quality of existing building foundation piles with parallel seismic method
  • Method for detecting quality of existing building foundation piles with parallel seismic method
  • Method for detecting quality of existing building foundation piles with parallel seismic method

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Embodiment Construction

[0023] The method of the present invention will be further described below in conjunction with the accompanying drawings of the description.

[0024] Such as figure 1 As shown, the basic idea of ​​the present invention is: drill a hole parallel to the foundation pile 12 within a certain range beside the foundation pile 12 to be tested, put a pipe 5 whose velocity of propagating seismic waves is lower than the foundation pile 12 in the hole, and be full of clear water in the pipe 6. Place the geophone 7 in the tube; during the test, pull up the geophone 7 vertically along the tube 5 from the bottom of the tube with a certain distance (such as 0.5m) and stop at different depth positions until the geophone 7 is placed on the top of the tube. Referring to the nozzle, at each depth position where the geophone stops, the cap 11 of the foundation pile 12 is excited to generate seismic waves, the seismic waves are received by the geophone 7 and transmitted to the engineering seismogra...

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Abstract

The invention discloses a method for detecting the quality of existing building foundation piles with a parallel seismic method. The method comprising the following steps: PVC pipes which are parallel to the foundation piles are embedded near the foundation piles of the existing building; an engineering seismograph is used for testing earthquake wave which is transmitted from the foundation piles along the depth direction of the PVC pipes; and the length and the integrity of the foundation piles are judged according to the first arrival time and the amplitude of the earthquake wave which is received by a detector. The detecting method has a following theory that the propagation velocity of the earthquake wave on the foundation piles is far greater than the propagation velocity on pile foundation, while the attenuation quotient is less than that of the pile foundation, when the detector is far from the bottom ends of the foundation piles, the propagation distance of the received earthquake wave in the soil is magnified, so as to necessarily extend the lag of the first arrival time and accelerate the attenuation of the amplitude, in a similar way, the positions of the defects of the foundation piles also has the same phenomenon that the first arrival time is suddenly extended and the amplitude is suddenly attenuated, therefore, by comprehensively analyzing the first arrival time and the amplitude of the earthquake wave, the length and the integrity of the foundation piles can be judged.

Description

technical field [0001] The invention relates to the detection technology of existing building foundation piles, specifically a method for judging the length and integrity of foundation piles through the first arrival time and amplitude of seismic waves in the side hole transmission wave method. Background technique [0002] Foundation engineering is an important part of construction engineering, and its quality is directly related to the structural safety of the entire building, and directly related to the safety of people's lives and properties. Pile foundation is one of the main foundation forms and is the preferred or required foundation form for many buildings. [0003] The routine detection methods of foundation pile quality include four categories and seven detection methods including single pile static load test (vertical compression, vertical pull-out, horizontal), core drilling method, high-strain and low-strain dynamic detection method, and acoustic wave transmissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
Inventor 杨桦吴宝杰潘金炎曾宪纯叶江
Owner 浙江省建筑科学设计研究院有限公司
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