Method for performing foundation pile integrity detection by coordination of low strain and ultrasonic waves
An integrity detection and ultrasonic technology, which is applied in basic structure testing, basic structure engineering, construction, etc., can solve problems such as inaccurate judgment and inaccurate defect judgment, and achieve the effect of accurate defect judgment
Inactive Publication Date: 2017-09-01
绵阳市川交公路规划勘察设计有限公司
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[0004] Aiming at the shortcomings of the prior art, the present invention provides a method for detecting the integrity of foundation piles with low strain and ultrasonic waves, which solves the problem of low pile integrity when measuring long piles or rock-socketed piles in the prior art. The defect judgment is inaccurate, and when the ultrasonic testing method is used, three acoustic measuring tubes are used to measure the foundation pile, and the center point of the foundation pile is the detection blind spot, resulting in the problem of inaccurate defect judgment
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[0033] The present invention will be further described below in conjunction with accompanying drawing and embodiment.
[0034] A method for detecting the integrity of foundation piles with low strain and ultrasonic waves, wherein the foundation piles are 50M long, and the steps are as follows:
[0035] (1) Lay foundation piles with acoustic tubes to obtain foundation piles that meet ultrasonic testing and low-strain testing, that is, before entering the site for testing, the pile-forming process, pile length, pile diameter, pile-forming date, concrete Intensity, etc., enter the site to observe and tap the pile head to understand its actual construction quality, such as whether the pile head is wet, mud-filled, loose, or contains mud. Ensure that the pile head is flat and intact, and use a grinding wheel to grind out 3-4 smooth surfaces with a diameter of 8-10cm, which will be used as excitation points and facilitate the installation of sensors;
[0036] (2) Ultrasonic detecti...
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The invention discloses a method for detecting the integrity of foundation piles with low strain combined with ultrasonic waves, which belongs to the technical field of foundation pile detection, and solves the defect that the piles are low when measuring long piles or rock-socketed piles by the low-strain dynamic measurement method in the prior art The judgment is inaccurate, and when the ultrasonic testing method is used, three acoustic measuring tubes are used to measure the foundation pile. The center point of the foundation pile is the detection blind spot, which causes the problem of inaccurate defect judgment. The present invention comprises the following steps: burying foundation piles with acoustic measuring tubes to obtain foundation piles conforming to ultrasonic testing and low-strain testing; performing ultrasonic testing on the buried foundation piles with acoustic measuring tubes, and making a preliminary judgment on whether there are defects in the foundation piles, If there is no defect, otherwise the information on the size, nature and location of the defect of the foundation pile with the acoustic tube can be obtained; through the low-strain detection equipment, the size, nature and location of the defect in the foundation pile can be obtained by using the propagation of the stress wave in the foundation pile information. The invention is used for integrity detection of foundation piles.
Description
technical field [0001] The invention discloses a method for detecting the integrity of foundation piles with low strain and ultrasonic waves, which is used for the integrity detection of foundation piles and belongs to the technical field of foundation pile detection. Background technique [0002] Low-strain dynamic measurement method: The low-strain dynamic measurement method uses a small hammer to hit the pile top, receives the stress wave signal from the pile through the sensor bonded to the pile top, and uses the stress wave theory to study the dynamic response of the pile-soil system. Inversion analysis of the measured velocity signal and frequency signal to obtain the integrity of the pile. This method is simple and fast, but how to obtain a good waveform and how to analyze the integrity of the pile is the key to the detection work. The test process is the key to obtain a good signal. During the test, attention should be paid to: ①Selection of test points. The number...
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Login to View More IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 王宇王方鑫符海龙王鹏廖彬吉
Owner 绵阳市川交公路规划勘察设计有限公司