Double-speed symmetrical superposition pipe pile integrity detection device and method
By arranging sensors symmetrically on both sides of the neutral plane of the bending vibration of the pipe pile, synchronously measuring and superimposing the velocity response curve, the problem of high-frequency interference in low-strain detection of pipe piles is solved, and more accurate pile body integrity detection is achieved.
Patent Information
- Application Number
- CN202510661251.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-22
- Publication Date
- 2025-10-17
AI Technical Summary
In existing low-strain testing of pipe piles, high-frequency interference affects the testing accuracy, especially for shallow and minute defects in the pile body, and the testing accuracy decreases as the incident wave length increases.
By employing a dual-velocity symmetrical superposition method, sensors are symmetrically arranged on both sides of the neutral plane of bending vibration to simultaneously measure and superimpose velocity response curves, thereby eliminating bending vibration mode interference. Combined with stress wave measurement and calculation analysis, the detection accuracy is improved.
It significantly improves the accuracy of low-strain detection of pipe piles, reduces the impact of high-frequency interference, narrows the detection blind area, and provides a more accurate assessment of pile integrity.
Smart Images
Figure CN120797752A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of pile foundation engineering, in particular to a double-speed symmetrical superposition pipe pile integrity detection device and method. BACKGROUND
[0002] In recent years, pipe piles are widely used in industrial and civil buildings and high-rise buildings, and the quality problems of pipe piles will cause unpredictable potential dangers to the structural safety of buildings, so the quality detection of pipe piles is particularly important. The quality of pipe piles is generally detected from two aspects: one is the detection of pile body integrity, and the other is the detection of pile body bearing capacity. Because of the forming process and manufacturing method of pipe piles, the impedance of the cross section is relatively stable, so the low strain dynamic test method is often used to detect the pile body integrity of the pile. The low strain dynamic test method mainly uses a small hammer to knock the pile top, and the stress wave signal from the pile is received through the sensor attached to the pile top. The stress wave theory is used to study the dynamic response of the pile-soil system, and the measured velocity signal and frequency signal are analyzed inversely to obtain the integrity of the pile.
[0003] In the low strain test of pipe piles, due to the non-symmetry of the impact load, there is obvious bending vibration mode in the pile body. The high-frequency interference at the pile top is mainly composed of two factors: bending vibration mode and the propagation of the incident wave at the pile top. In order to reduce the influence of the bending mode on the high-frequency interference at the pile top, the receiver in the low strain test of pipe piles is often placed on the neutral plane at an angle of 90 degrees with the impact point. It is found through research that the phase of the high-frequency interference of the pipe pile is symmetrical about the neutral plane, and the amplitude is roughly equal. Increasing the width of the incident pulse at the pile top can effectively reduce the strength of the high-frequency interference, but with the increase of the length of the incident wave, the detection accuracy of the low strain test for the shallow defects and small defects of the pipe pile is also decreasing.
[0004] In order to solve this problem and achieve the effect of reducing the influence of high-frequency interference while not reducing the detection accuracy, the present application proposes to symmetrically arrange sensors on both sides of the bending vibration neutral plane (90 degrees), synchronously measure the velocity response of the two measuring points, and superimpose the obtained velocity response curves to eliminate the interference of the bending vibration mode on the velocity response curve at the pile top. It is particularly urgent to study a new type of pipe pile integrity detection device and method. SUMMARY
[0005] The purpose of the present application is to provide a double-speed symmetrical superposition pipe pile integrity detection device and method, which has the effect of improving the accuracy of pipe pile low strain detection.
[0006] The above technical purpose of the present application is realized by the following technical scheme: A double-speed symmetrical superposition pipe pile integrity detection device, comprising a stress wave measurement assembly, a defect detection device and a calculation component; wherein, The stress wave measuring assembly is arranged at the edge of the pipe pile and used for measuring the stress wave response of the pipe pile. The defect detection device comprises a fixing member arranged at the center of the end of the pipe pile, two pointers are coaxially arranged on the fixing member, the two pointers are symmetrically distributed on the neutral plane, the rotation centers of the two pointers are located at the center of the fixing member, an angle adjusting assembly is arranged in the fixing member, and the angle adjusting assembly is used for adjusting the synchronous relative deflection of the two pointers. The calculating component is connected with the stress wave measuring assembly and the speed detection assembly, and is used for calculating and analyzing the values obtained by the speed detection assembly and the stress wave measuring assembly, so as to analyze the integrity performance of the pipe pile.
[0007] As a further arrangement of the present application, the angle adjusting assembly comprises a first gear shaft arranged vertically at the center of the fixing member, a gear one is coaxially fixedly arranged at the bottom of the first gear shaft, the gear one is meshingly connected with a gear two, the gear two is fixedly connected with a second gear shaft, the second gear shaft is rotatably connected with the fixing member, a gear three is coaxially fixedly arranged above the gear two on the second gear shaft, the gear three is meshingly connected with a gear four, the gear four is fixedly connected with a third gear shaft, the third gear shaft is rotatably connected with the fixing member, a gear five is coaxially fixedly arranged above the gear four on the third gear shaft, the gear five is meshingly connected with a gear six, the gear six is coaxially fixedly connected with a connecting shaft sleeve, the connecting shaft sleeve is coaxially arranged with the first gear shaft, and the connecting shaft sleeve is rotatably connected with the fixing member.
[0008] As a further arrangement of the present application, the fixing member comprises a hollow cylindrical structure, and the angle adjusting assembly is located in the interior of the fixing member, and the two pointers are located outside the top of the fixing member.
[0009] As a further arrangement of the present application, a horizontal marker and a neutral plane marker are orthogonally fixedly arranged on the upper surface of the fixing member, and the two pointers are symmetrically distributed on the two sides of the neutral plane marker.
[0010] As a further arrangement of the present application, the stress wave measuring assembly comprises a stress wave measuring sensor.
[0011] As a further arrangement of the present application, the speed detection assembly comprises two acceleration sensors, and the two acceleration sensors detect the speed responses of the two pointers respectively.
[0012] As a further arrangement of the present application, the pointers are arranged in a telescopic structure with adjustable length.
[0013] The detection method of the double-speed symmetric superposition pipe pile integrity detection device comprises the following steps. S1: The floating slurry, loose and damaged parts of the pipe pile head are reasonably cleaned, and the hard concrete surface is exposed to ensure that the surface of the pile top is flat and clean, and is perpendicular to the pile axis, and the detection surface is polished flat. S2: The stress wave measuring sensor is fixedly installed at the edge position of the pipe pile top, and is kept perpendicular to the top surface. S3: The defect detection device is fixedly arranged at the center position of the pipe pile, and the rotation centers of the two pointers are located at the center position of the pipe pile. S4: First, the pointer angle is adjusted, and the positions pointed to by the two pointers are marked as (A1, A2). The speed detection assembly is bonded at the marked (A1, A2), and the calculation component is connected. S5: The excitation force is applied to the pipe pile at the specified position, the stress wave measuring assembly receives the stress wave signal, the speed detection assembly obtains the speed response data of the pointer, and the data is transmitted to the calculation component for analysis and processing to obtain clear and accurate detection signals. S6: The pointer is readjusted, multiple angles are taken and positions (B1, B2), (C1, C2) and the like are marked for detection, and then the above detection operation is repeated to obtain multiple sets of clear and accurate detection signals, and pipe pile integrity detection data is calculated and analyzed.
[0014] As a further setting of the present application, in step S6, the selection of multiple angles includes two symmetric positions of the neutral plane 45 degrees.
[0015] The beneficial effects of the present application are: The present application proposes to symmetrically arrange two pointers on both sides of the bending vibration neutral plane. When detecting, the excitation force causes the two pointers to deflect. At this time, the speed detection assembly arranged on one side of the pointer synchronously measures the speed response of the detection points of the two pointers, and the stress wave measuring assembly detects the stress wave response of the pipe pile. The calculation component analyzes the speed response and stress wave response data to obtain the complete pipe pile integrity performance. In the above process, the speed detection assembly simultaneously detects the speed response of the detection points of the two pointers, and superimposes the obtained speed response curves to eliminate the interference of the bending vibration mode on the speed response curve of the pipe pile top, so that the detection result is more accurate, and the incident pulse width does not need to be increased in this process, so that it is more convenient and efficient. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.
[0017] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the defect detection device of the present embodiment; Figure 2 Fig. 2 is a schematic diagram of the structure of the angle adjusting assembly of the present embodiment; Figure 3 Fig. 3 is a schematic diagram of the structure of the angle adjusting assembly of the present embodiment.
[0018] In the figure, 1 is a pointer, 2 is a fixed part, 31 is a first gear shaft, 32 is a gear one, 33 is a gear two, 34 is a second gear shaft, 35 is a gear three, 36 is a gear four, 37 is a third gear shaft, 38 is a gear five, 39 is a gear six, 310 is a connecting shaft sleeve, 4 is a horizontal marker, and 5 is a neutral plane marker. DETAILED DESCRIPTION
[0019] The technical solutions of the present application will be described clearly and completely in combination with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.
[0020] EMBODIMENT A double-speed symmetrical superposition pipe pile integrity detection device, comprising a stress wave measuring assembly, a defect detection device and a computing component; wherein, The defect detection device comprises a fixed part 2, two pointers 1 coaxially arranged on the fixed part 2, the two pointers 1 being symmetrically distributed on the neutral plane, the rotation centers of the two pointers 1 being located at the center position of the fixed part 2, an angle adjusting assembly arranged in the fixed part 2, the angle adjusting assembly being used for adjusting the synchronous relative deflection of the two pointers 1; further comprising a speed detection assembly for obtaining the deflection speed of the two pointers 1, the computing component performing calculation and analysis on the values obtained by the speed detection assembly and the stress wave measuring assembly.
[0021] Further, the angle adjusting assembly comprises a first gear shaft 31 vertically arranged at the center of the fixing member 2, a gear one 32 coaxially fixed at the bottom of the first gear shaft 31, a gear two 33 meshingly connected with the gear one 32, a second gear shaft 34 fixedly connected with the gear two 33, the second gear shaft 34 being rotatably connected with the fixing member 2, a gear three 35 coaxially fixed above the gear two 33, a gear four 36 meshingly connected with the gear three 35, a third gear shaft 37 fixedly connected with the gear four 36, the third gear shaft 37 being rotatably connected with the fixing member 2, a gear five 38 coaxially fixed above the gear four 36, a gear six 39 meshingly connected with the gear five 38, a connecting shaft sleeve 310 coaxially fixed with the gear six 39, the connecting shaft sleeve 310 being coaxially arranged with the first gear shaft 31 and rotatably connected with the fixing member 2, and one end of each of the two pointers 1 being fixedly connected with the first gear shaft 31 and the connecting shaft sleeve 310 respectively.
[0022] Further, the fixing member 2 comprises a hollow cylindrical structure, the angle adjusting assembly is located inside the fixing member 2, and the two pointers 1 are located outside the top of the fixing member 2.
[0023] Further, the upper surface of the fixing member 2 is orthogonally fixed with a horizontal marker 4 and a neutral plane marker 5, and the two pointers 1 are symmetrically distributed on the two sides of the neutral plane marker 5.
[0024] Further, the stress wave measuring assembly comprises a stress wave measuring sensor.
[0025] Further, the speed detecting assembly comprises two acceleration sensors, and the two acceleration sensors detect the speed responses of the two pointers 1 respectively.
[0026] Compared with the existing low strain integrity detection method of pipe piles, the two groups of synchronous acceleration sensors symmetrically arranged on the two sides of the bending vibration neutral plane of the pipe pile are used for detection in the embodiment, the high-frequency interference phenomenon in the low strain test process of the pipe pile is effectively eliminated, the detection precision is significantly improved, and the inspection blind area existing near the pile top is greatly reduced.
[0027] In addition, the calculation component of the embodiment comprises a high-sensitivity detection system based on the double-speed symmetric superposition principle, the high-sensitivity detection system contains the data acquisition and analysis software which has been programmed, the system can realize automatic superposition analysis of data, eliminate the main components (bending vibration mode) in high-frequency interference, and increase an intelligent filtering module in the system, so that the secondary components of high-frequency interference can be automatically predicted, identified and filtered according to the pipe pile parameters and the nature of the excitation source, to obtain clear and accurate detection signals.
[0028] In another embodiment, the pointer 1 is set as a telescopic structure with adjustable length, by which the length of the pointer can be adjusted, suitable fixing members are selected according to different pipe piles, and the pointer is adjusted to a suitable length according to the diameter of the fixing member, so that the speed response is conveniently detected.
[0029] According to the detection method of the double-speed symmetrical superposition pipe pile integrity detection device, the specific steps are as follows: S1: The loose, damaged and broken parts of the pipe pile head are reasonably cleaned, and the hard concrete surface is exposed, so that the surface of the pile top is flat and clean, and is perpendicular to the pile axis, and the detection surface is polished flat; S2: The stress wave measuring sensor is fixedly installed at the edge position of the pipe pile top, and is kept perpendicular to the top surface; S3: The defect detection device is fixedly arranged at the center position of the pipe pile, and the rotation centers of the two pointers 1 are located at the center position of the pipe pile; S4: First, adjust the angle of the pointer 1, mark the positions pointed by the two pointers 1 as (A1, A2), and bond the speed detection assembly at the marked positions (A1, A2), and connect the calculation component; S5: Apply an exciting force to the pipe pile at the specified position, the stress wave measuring assembly receives the stress wave signal, the speed detection assembly obtains the speed response data of the pointer 1, and transmits the data to the calculation component, and the calculation component analyzes and processes the data to obtain clear and accurate detection signals; S6: Re-adjust the pointer 1, take multiple angles and mark positions (B1, B2), (C1, C2) and the like for detection, and then repeat the above detection operation to obtain multiple sets of clear and accurate detection signals, and calculate and analyze the pipe pile integrity detection data.
[0030] Further, in step S6, the multiple angles include two symmetrical positions of the neutral plane 45 degrees.
[0031] Those skilled in the art will readily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A dual-speed symmetrical superposition pipe pile integrity detection device, characterized by: It includes stress wave measurement components, defect detection devices and calculation components; among which, The stress wave measurement component is arranged at the edge of the pipe pile and is used to measure the stress wave response of the pipe pile; The defect detection device comprises a fixing member (2) arranged at the center of the end of the pipe pile, two pointers (1) are coaxially rotatably arranged on the fixing member (2), the two pointers (1) are symmetrically distributed on the neutral plane, and the rotation centers of the two pointers (1) are located at the center position of the fixing member (2), and an angle adjustment component is provided in the fixing member (2), and the angle adjustment component is used to adjust the synchronous relative deflection of the two pointers (1); the defect detection device also includes a speed detection component for obtaining the deflection speed of the two pointers (1); The calculation component is connected to the stress wave measurement component and the speed detection component, and is used to perform calculation analysis on the values obtained by the speed detection component and the stress wave measurement component to analyze the integrity performance of the pipe pile.
2. The dual-speed symmetrical stacked pile integrity detection device according to claim 1, characterized in that: The angle adjustment assembly includes a first gear shaft (31) vertically rotatably arranged at the center of the fixing member (2), a gear 1 (32) coaxially fixedly arranged at the bottom of the first gear shaft (31), the gear 1 (32) meshingly connected to the gear 2 (33), the gear 2 (33) fixedly connected to the second gear shaft (34), the second gear shaft (34) rotatably connected to the fixing member (2), the second gear shaft (34) is located above the gear 2 (33) and coaxially fixedly arranged with a gear 3 (35), the gear 3 (35) meshingly connected to the gear 4 (36), the gear 4 (36) fixedly connected to the A third gear shaft (37), the third gear shaft (37) is rotatably connected to the fixed member (2), the third gear shaft (37) is located above the gear four (36) and is coaxially fixedly provided with a gear five (38), the gear five (38) is meshedly connected with a gear six (39), the gear six (39) is coaxially fixedly connected with a connecting shaft sleeve (310), the connecting shaft sleeve (310) is coaxially provided with the first gear shaft (31), the connecting shaft sleeve (310) is rotatably connected to the fixed member (2), and one end of the two pointers (1) is respectively fixedly connected to the first gear shaft (31) and the connecting shaft sleeve (310).
3. The dual-speed symmetrical stacked pile integrity detection device according to claim 1, characterized in that: The fixing member (2) comprises a hollow cylindrical structure, the angle adjustment component is located inside the fixing member (2), and the two pointers (1) are located outside the top of the fixing member (2).
4. The dual-speed symmetrical stacked pipe pile integrity detection device according to claim 3, characterized in that: A horizontal marker (4) and a neutral plane marker (5) are orthogonally fixedly provided on the upper surface of the fixing member (2), and the two pointers (1) are symmetrically distributed on both sides of the neutral plane marker (5).
5. The dual-speed symmetrical stacked pipe pile integrity detection device according to claim 1, characterized in that: The stress wave measurement component includes a stress wave measurement sensor.
6. The dual-speed symmetrical stacked pile integrity detection device according to claim 1, characterized in that: The speed detection component comprises two acceleration sensors, and the two acceleration sensors respectively detect the speed responses of the two pointers (1).
7. The dual-speed symmetrical stacked pile integrity detection device according to claim 1, characterized in that: The pointer (1) is configured as a retractable structure with adjustable length.
8. A detection method for a dual-speed symmetrical stacked pipe pile integrity detection device according to any one of claims 1 to 7, characterized in that: The following steps are included: S1: Clean the floating slurry, loose and damaged parts of the pile head properly to expose the hard concrete surface. Ensure that the surface of the pile top is flat and clean and perpendicular to the pile axis. Grind the test surface flat. S2: Fix the stress wave measurement sensor on the top edge of the pile and keep it perpendicular to the top surface; S3: The defect detection device is fixedly set at the center of the pipe pile, and the rotation centers of the two pointers (1) are ensured to be located at the center of the pipe pile; S4: First, adjust the angle of the pointer (1), mark the positions indicated by the two pointers (1) as (A1, A2), bond the speed detection component at the marked (A1, A2), and connect the calculation component; S5: Apply an exciting force to the pile at a designated position, the stress wave measurement component receives the stress wave signal, the speed detection component obtains the speed response data of the pointer (1), and both the stress wave signal and the speed response data are transmitted to the calculation component, which analyzes and processes the data to obtain a clear and accurate detection signal; S6: Re-adjust the pointer (1), take multiple angles and mark the positions (B1, B2), (C1, C2), etc. for detection, and then repeat the above detection operation to obtain multiple sets of clear and accurate detection signals, and calculate and analyze the pile integrity detection data.
9. The detection method of the dual-speed symmetrical superimposed pipe pile integrity detection device according to claim 8, characterized in that: In step S6 , the selection of multiple angles includes two symmetrical positions at 45 degrees to the neutral plane.