Low-strain existing foundation pile integrity detection method capable of eliminating upper structure influences
A low-strain, complete technology, applied in foundation structure testing, foundation structure engineering, construction, etc., can solve problems such as high requirements for data acquisition systems, cumbersome and time-consuming on-site operations, and unsatisfactory foundation pile effects. The effect of simple equipment, concise principle, strong engineering application and promotion prospect
Active Publication Date: 2019-03-15
建研院检测中心有限公司
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Problems solved by technology
The number of sensors installed is large, the equipment is relatively complex, the requirements for the data acquisition system are high, and the on-site operation is cumbersome and time-consuming
[0007] my country is a big country in infrastructure construction, and the use of foundation piles is very common. After the construction of the engineering structure, due to various reasons, it is necessary to know the quality of the foundation piles. Currently, the low-strain method is used to detect the existing foundation piles. Complicated, cumbersome and time-consuming on-site operations, it is urgent to invent a new method
Method used
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Embodiment 1
[0057] For an existing foundation pile, the thickness of the upper part of the foundation pile is 1m, the diameter of the foundation pile is 0.5m, and the pile length is 10m. m, after the excitation block is excited, the data of the two speed sensors are collected, and the following is obtained: image 3 In the waveform diagram shown, speed 1 is the waveform collected by the upper speed sensor, and speed 2 is the waveform collected by the lower speed sensor. By adopting the method of the present invention, the waveforms of speed 1 and the upward wave after eliminating the influence of the upper structure are shown in Figure 4 , 5 , it can be seen from the figure that there is an obvious reflection in the same direction at about 4.0m below the speed sensor 1, which can be judged as a necking defect of the pile body.
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The invention provides a low-strain existing foundation pile integrity detection method capable of eliminating upper structure influences. By means of the method, when an upper structure meets certainconditions, the upper structure can be considered as an approximate pile top solid joint, the upper structure influences are approximately a secondary excitation function which has certain time delaycompared with initial excitation and is opposite to the initial excitation in direction, analytical calculation is carried out according to the stress wave principle, and secondary excitation formedby the upper structure is completely eliminated. The method is simple in principle and simple in operation. Compared with other low-strain test methods, the number of installed sensors is one or two,acquisition equipment is simple, the result is accurate and reliable, and strong engineering application and promotion prospects are achieved.
Description
technical field [0001] The invention relates to the field of engineering detection, in particular to a detection method for the integrity of existing foundation piles. Background technique [0002] Existing foundation pile integrity detection is of great significance for the safety and quality appraisal of existing buildings. When the quality of foundation piles needs to be known, foundation pile integrity (defect) detection is required. Since the existing foundation piles are partially or completely buried under the foundation, its detection is affected by the superstructure and foundation, and the defect detection of foundation piles is relatively difficult. [0003] At present, the most common method for foundation pile integrity testing is the low-strain method. By exciting the pile top with a small hammer or a force rod, using a velocity or acceleration sensor to measure the velocity or admittance curve of the pile body, and using the wave theory of the rod, For the id...
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CPCE02D33/00E02D2600/10
Inventor 徐教宇
Owner 建研院检测中心有限公司
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