一种适用于循环荷载下桩-土界面损伤检测装置
By using a wide-band response piezoelectric ceramic sensor and data acquisition system in bridge pile foundation testing, the problems of low detection accuracy and poor stability in existing technologies have been solved, enabling real-time and accurate detection of pile-soil interface damage and improving detection accuracy and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NORTHWEST RES INST CO LTD OF C R E C
- Filing Date
- 2025-09-18
- Publication Date
- 2026-07-17
AI Technical Summary
Existing piezoelectric ceramic sensors suffer from low accuracy and poor stability in bridge pile foundation inspection, making them unsuitable for inspection tasks in harsh environments. Furthermore, traditional load transfer models suffer from numerical oscillations in interface contact algorithms due to differences in pile-soil stiffness, affecting the accuracy of deformation prediction.
Employing a wide-band response and high-sensitivity piezoelectric ceramic sensor, combined with a normal loading component and a vertical guiding component, cyclic loading is simulated. The structural state is captured in real time through a data acquisition and measurement system. The mechanical pressure is converted into an electrical signal using the piezoelectric effect, and the waveform is displayed through a signal amplifier and an oscilloscope, ensuring the sensor's anti-interference and anti-corrosion performance.
It enables real-time and accurate detection of pile-soil interface damage in harsh environments, avoids numerical oscillations of traditional models, improves detection accuracy and stability, and meets the long-term service inspection needs of bridge pile foundations.
Smart Images
Figure CN224518482U_ABST
Abstract
Claims
1. A device for detecting pile-soil interface damage under cyclic loading, characterized in that, It includes a fixed frame, a sample box assembly, a normal loading assembly, a vertical guide assembly, and a data acquisition and measurement system; The fixed frame is fixed to the ground to provide fixed support for the test equipment, and a horizontal crossbeam is fixed in the middle of the fixed frame. The sample box assembly is placed horizontally on the crossbeam in the middle of the fixed frame. The sample box assembly includes an upper sample box and a lower sample box. A precast concrete slab is placed in the upper sample box, and a soil sample is placed in the lower sample box. The upper sample box is attached to the lower sample box. Strain gauges and soil pressure sensors (15) are attached in a matrix pattern on the front surface of the lower sample box. At least two vertical displacement sensors (4) are attached symmetrically on both sides of the top of the upper sample box. The normal loading component is connected between the sample box assembly and the fixed frame, and is used to apply a vertical load to the top center of the sample box assembly. The vertical guide assembly is connected between the two sides of the sample box assembly and the fixed frame, and the vertical guide assembly is used to limit the lateral displacement of the sample box assembly. The data acquisition and measurement system is used to acquire data from strain gauges and earth pressure sensors (15).
2. The device for detecting damage of a pile-soil interface under cyclic loading according to claim 1, wherein The fixed frame includes a horizontal I-beam (1), with vertical support columns (17) connected to both ends of the I-beam (1), and cross connecting rods (18) connecting the bottoms of the support columns (17).
3. The device for detecting damage of a pile-soil interface under cyclic loading according to claim 2, wherein The normal loading component is loaded by a vibrator (2) to apply vertical compressive stress, simulating the cyclic load generated by train operation. The vibrator (2) is fixed to the bottom center of the I-beam (1).
4. The device for detecting damage of a pile-soil interface under cyclic loading according to claim 2, wherein The vertical guide assembly includes two horizontal bars, which are fixedly connected to the left and right sides of the upper sample box, and the two horizontal bars extend outward horizontally; the head end of the horizontal bar is connected to a vertical groove, which is engaged with the support column (17) of the fixed frame.
5. The device for detecting pile-soil interface damage under cyclic loading according to claim 1, characterized in that, The data acquisition and measurement system includes a signal amplifier (9) and an oscilloscope (7). The signal is filtered and amplified by the signal amplifier (9) and different waveforms are displayed on the oscilloscope (7).
6. The device for detecting damage of a pile-soil interface under cyclic loading according to claim 1, wherein The sample box assembly is an empty box formed by welding steel plates. Precast concrete test blocks and soil test blocks are placed vertically inside. When filling the lower sample box with soil, strain gauges and soil pressure sensors (15) are attached to the front surface.