A vibration system for pile integrity testing under a pile cap

Abstract

The application relates to the field of engineering detection, in particular to a knocking system for pile integrity detection under a bearing platform, which comprises a support frame for being placed on a surface to be detected and a knocking mechanism mounted on the support frame, the knocking mechanism comprising a guide sleeve, a knocking piece arranged in the guide sleeve and in sliding connection with the guide sleeve, an elastic assembly arranged on the knocking piece and away from the surface to be detected, a pulling assembly for pulling the knocking piece along the length direction of the guide sleeve, and a limiting piece for limiting the stroke end of the knocking piece, the pulling assembly pulls the knocking piece to compress the elastic assembly and accumulate elastic potential energy until the knocking piece is limited by the limiting piece, and the pulling assembly releases the knocking piece after the knocking piece is limited by the limiting piece. The application can make the energy and impact characteristics of each knocking of the knocking piece highly consistent, and can provide reliable data basis for signal comparison and analysis.

Description

Technical Field

[0001] This application relates to the field of engineering testing technology, specifically to a vibration system for detecting the integrity of piles under a foundation slab. Background Technology

[0002] In the field of building construction, the inspection of the integrity of piles under the foundation slab is crucial. Accurate inspection of pile integrity can promptly detect defects in the pile body, such as cracks and fractures, thereby ensuring the stability and safety of the building structure.

[0003] Simulation and experimental data both show that the location of the excitation point and the installation position of the sensor have a great influence on the stress wave reception results. In the existing pile integrity detection technology under the slab, a vibratory hammer is usually used to strike near the sensor. However, with this detection method, it is difficult to keep the relative position of the vibratory hammer landing point and the sensor strictly consistent with each strike, resulting in poor repeatability of the test results. Utility Model Content

[0004] To address the technical problems in the prior art, this application provides a vibration excitation system for detecting the integrity of piles under a foundation plate.

[0005] The vibration system for detecting the integrity of piles under a foundation slab provided in this application adopts the following technical solution: A vibration system for detecting the integrity of piles under a foundation slab, comprising: Support frame, used to place the surface to be tested; A vibration mechanism is installed on the support frame. The vibration mechanism includes a guide sleeve, a striking element disposed within and slidably connected to the guide sleeve, an elastic component disposed on the striking element away from the surface to be measured, a pulling component for pulling the striking element along the length direction of the guide sleeve, and a limiting component for limiting the end point of the striking element's stroke. The pulling component is configured to pull the striking member to compress the elastic component and accumulate elastic potential energy until the striking member is limited by the limiting member. After the striking member is limited by the limiting member, the pulling component releases the striking member. By adopting the above technical solution, when the pulling component pulls the striking component, the elastic component accumulates elastic potential energy until the striking component is limited by the limiting component. At this time, the pulling component stops pulling the striking component, and the elastic potential energy of the elastic component is released to push the striking component. This process is repeated, so that the energy and impact characteristics of each strike of the striking component are highly consistent, making all the collected data strictly comparable and providing a reliable data foundation for signal comparison and analysis.

[0006] Preferably, the support frame includes multiple support columns and an adjustment plate fixed to the top of the support columns. Each support column is provided with a telescopic sleeve at one end away from the adjustment plate and a first fixing member threaded through the telescopic sleeve and connected to the telescopic sleeve. The extended end of the first fixing member abuts against the support column.

[0007] By adopting the above technical solution, the height and angle of the support frame can be adjusted by sliding the bearing column and the telescopic sleeve relative to each other. The telescopic sleeve and the bearing column can be fixed by turning the first fixing part, so that the support frame can flexibly adapt to the uneven surface to be tested.

[0008] Preferably, the adjusting plate is equipped with a bubble level.

[0009] By adopting the above technical solution, users can use a bubble level to observe the levelness of the support frame and adjust the angle of the support frame according to the observed levelness.

[0010] Preferably, a counterweight plate is fixed at the bottom of the telescopic sleeve and is in contact with the surface to be tested. The side of the counterweight plate away from the surface to be tested carries a counterweight block.

[0011] By adopting the above technical solution, a counterweight is placed on the counterweight plate to prevent the support frame from shifting due to vibration during the operation of the excitation system.

[0012] Preferably, the guide sleeve is symmetrically provided with two slots, and two first sliders are respectively provided on both sides of the striking member, with the two first sliders slidably connected to the two slots respectively.

[0013] By adopting the above technical solution, the two first sliders respectively cooperate with the two slots to limit the movement of the striking part, so that the striking part will not rotate around the axis of the guide sleeve during the movement, thus ensuring the stability of the striking part.

[0014] Preferably, the two ends of the striking member are provided with rotating shafts that are rotatably connected to the two first sliders respectively, and the outer circumferential surface of the striking member is provided with a plurality of striking blocks of different materials in a circular array around the axis of the rotating shaft.

[0015] By adopting the above technical solution, the rotating striking component can switch between striking blocks of different materials, thereby flexibly switching the excitation material to generate stress waves of different frequencies.

[0016] Preferably, the first slider sidewall is provided with a threaded hole and a second fixing member that mates with the threaded hole, and the extended end of the second fixing member abuts against the rotating shaft.

[0017] By adopting the above technical solution, when the striking part rotates and the striking block is switched, the second fixing part can be turned to adjust the contact force between the second fixing part and the rotating shaft, thereby suppressing the rotation of the striking part.

[0018] Preferably, the elastic component includes an abutment plate that abuts against the striking member, and an elastic member fixed to the abutment plate at one end away from the striking member. The end of the elastic member away from the abutment plate is fixed to the upper part of the guide sleeve, and the inner wall surface of the guide sleeve is provided with a guide groove that cooperates with the abutment plate.

[0019] By adopting the above technical solution, the limiting component provides a support point for the elastic component, and the abutment plate is used to transfer the elastic potential energy of the elastic component to the striking component.

[0020] Preferably, the limiting member includes a second slider that mates with the slot and a third fixing member that is threadedly engaged with the second slider, wherein the end of the third fixing member facing away from the second slider abuts against the opening of the slot.

[0021] By adopting the above technical solution, the third fixing member can be fixed at any position along the length of the slot, and the second slider can stop the first slider, thereby limiting the movement of the striking member. When the fixing member is fixed in different positions, the elastic potential energy stored in the elastic component also changes, thereby changing the striking force of the striking member.

[0022] Preferably, the pulling assembly includes a roller, a pull rope with both ends fixed to the roller and the first slider respectively, and a driving component for driving the roller to rotate.

[0023] By adopting the above technical solution, the driving component drives the roller to rotate, and during the rotation of the roller, it drives the pull rope to pull the first slider.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. When the pulling component pulls the striking component, the elastic component accumulates elastic potential energy until the striking component is limited by the limiting component. At this time, the pulling component stops pulling the striking component, and the elastic potential energy of the elastic component is released to push the striking component. This process is repeated to ensure that the energy and impact characteristics of each strike are highly consistent, making all collected data strictly comparable and providing a reliable data foundation for signal comparison and analysis.

[0025] 2. The height and angle of the support frame can be adjusted by sliding the support column and the telescopic sleeve relative to each other. The telescopic sleeve and the support column can be fixed by turning the first fixing part, so that the support frame can flexibly adapt to uneven test surfaces. Users can observe the levelness of the support frame by using a bubble level and adjust the angle of the support frame according to the observed levelness.

[0026] 3. The rotating striking component can switch between striking blocks of different materials by rotating, thereby flexibly switching the excitation material to generate stress waves of different frequencies. When the striking component rotates and the striking block is switched, the second fixing component can be turned to adjust the contact force between the second fixing component and the rotating shaft, thereby suppressing the rotation of the striking component and ensuring that the replaced striking block can strike stably. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of a vibration system for detecting the integrity of piles under a foundation slab, as provided in this application. Figure 2 yes Figure 1 Enlarged view of region A in the middle; Figure 3 This is a schematic diagram of the excitation mechanism; Figure 4 yes Figure 1 Enlarged view of region B in the middle; Explanation of reference numerals in the attached drawings: 1. Support frame; 11. Bearing column; 12. Adjusting plate; 121. Bubble level; 13. Telescopic sleeve; 131. First fixing component; 132. Counterweight plate; 133. Counterweight block; 2. Vibration mechanism; 21. Guide sleeve; 211. Slot; 212. Guide groove; 22. Striking component; 221. First slider; 2211. Threaded hole; 2212. Second fixing component; 222. Rotating shaft; 223. Striking block; 23. Elastic component; 231. Abutment plate; 232. Elastic component; 24. Pulling component; 241. Roller; 242. Pull rope; 243. Driving component; 25. Limiting component; 251. Second slider; 252. Third fixing component; 3. Surface to be measured. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0029] This application discloses a vibration system for detecting the integrity of piles under a foundation slab. (Refer to...) Figure 1 , Figure 1 This is a schematic diagram of a vibration system for detecting the integrity of piles under a foundation slab, as provided in this application. The vibration system includes a support frame 1 and a vibration mechanism 2. The support frame 1 is placed on the surface 3 to be tested, providing stable support for the vibration mechanism 2. The vibration mechanism 2 is mounted on the support frame 1 and can strike the pile according to a set pattern. This combined structure allows the vibration system to stably excite the pile under test and accurately detect the vibration, ensuring the reliability and comparability of the test data. Because the energy and impact characteristics of each strike by the striking element 22 are highly consistent, the collected data have strict comparability, providing a solid data foundation for subsequent signal comparison and analysis.

[0030] Please refer to the following: Figure 2 , Figure 2 yes Figure 1 Enlarged view of area A; the support frame 1 includes multiple load-bearing columns 11 and an adjusting plate 12 fixed to the top of the load-bearing columns 11. The load-bearing columns 11 are generally made of high-strength metal materials, such as stainless steel or aluminum alloy, to ensure sufficient load-bearing capacity. The adjusting plate 12 is usually a flat metal plate, fixed to the load-bearing columns 11 by welding or bolting. Each load-bearing column 11 has a telescopic sleeve 13 fitted onto the end opposite to the adjusting plate 12, and a first fixing member 131 threaded through and connected to the telescopic sleeve 13. The extended end of the first fixing member 131 abuts against the load-bearing column 11. The telescopic sleeve 13 can be made of the same or similar metal material as the load-bearing column 11, with its inner diameter slightly larger than the outer diameter of the load-bearing column 11 to achieve relative sliding. The first fixing member 131 can be a bolt, which, by tightening, abuts against the load-bearing column 11 at its end, thereby fixing the relative position of the telescopic sleeve 13 and the load-bearing column 11. Here, the telescopic sleeve 13 can also be replaced with a hydraulic rod with telescopic function. The hydraulic rod can control the telescopic length more precisely and has better stability.

[0031] During operation, when testing is required on uneven ground, the first fixing member 131 on each support column 11 can be loosened to allow the telescopic sleeve 13 to slide freely relative to the support column 11, adjusting the length of each support leg. After adjustment, the first fixing member 131 is tightened so that its end abuts against the support column 11, locking the telescopic sleeve 13 using friction. In this way, the height and angle of the support frame 1 can be easily adjusted by allowing the support column 11 and the telescopic sleeve 13 to slide relative to each other, enabling the support frame 1 to flexibly adapt to uneven test surfaces 3 and ensuring the verticality and stability of subsequent vibration.

[0032] The leveling plate 12 is equipped with a bubble level 121. The bubble level 121 is a common tool for measuring levelness, typically consisting of a glass tube and an internal bubble. Users can use the bubble level 121 to observe the levelness of the support frame 1 and adjust the angle of the support frame 1 based on the observed levelness to ensure the vibration system is level, thereby improving the accuracy of the test.

[0033] A counterweight plate 132 is fixed to the bottom of the telescopic sleeve 13, which is in contact with the surface to be measured 3. The side of the counterweight plate 132 facing away from the surface to be measured 3 supports a counterweight block 133. The counterweight plate 132 is generally made of a heavy metal material, such as cast iron, to increase its own weight. The counterweight block 133 can be an iron block or a lead block, etc., and an appropriate weight is selected according to actual needs. Placing the counterweight block 133 on the counterweight plate 132 is intended to effectively prevent the support frame 1 from shifting due to the reaction force generated by the impact or small vibrations of the ground during the operation of the vibration system, thereby ensuring the stability of the entire vibration system.

[0034] Please refer to the following: Figure 3 , Figure 3 This is a schematic diagram of the vibration mechanism 2. The vibration mechanism 2 includes a guide sleeve 21, a striking element 22 disposed inside the guide sleeve 21 and slidably connected to the guide sleeve 21, an elastic component 23 disposed on the striking element 22 away from the surface 3 to be measured, a pulling component 24 for pulling the striking element 22 along the length of the guide sleeve 21, and a limiting component 25 for limiting the end point of the stroke of the striking element 22. The guide sleeve 21 is usually a metal cylinder with a smooth inner wall to reduce the friction when the striking element 22 slides. The guide sleeve 21 has two symmetrical slots 211. Two first sliders 221 are respectively disposed on both sides of the striking element 22, and the two first sliders 221 are slidably connected to the two slots 211 respectively. The first sliders 221 are generally made of wear-resistant plastic or metal material, and their shape matches the slots 211. Grooves can be provided on both sides of the first sliders 221, and the inner wall surface of the slots 211 is in contact with the bottom surface of the grooves, thereby preventing the first sliders 221 from falling off. The two first sliders 221 cooperate with the two slots 211 respectively. The technical effect is that it not only guides the striking part 22 to make precise reciprocating linear motion along the axis of the guide sleeve 21, but also effectively limits the movement of the striking part 22 in the circumferential direction, so that it will not rotate around the axis of the guide sleeve 21 during the movement, thus ensuring that the striking part 22 can finally strike the target point in a stable posture.

[0035] The striking element 22 has rotating shafts 222 at both ends, each rotatably connected to two first sliders 221. Multiple striking blocks 223 of different materials are arranged in a circular array around the axis of the rotating shafts 222 on the outer circumference of the striking element 22. The rotating shafts 222 are generally made of high-strength metal and are connected to the first sliders 221 via bearings to achieve rotation. The striking blocks 223 can be made of materials with different hardness and elasticity, such as steel, copper, and rubber. Different materials of striking blocks 223 can excite stress waves of different frequencies. By manually rotating the striking element 22, the striking blocks 223 of different materials can be easily switched to be aligned with the surface 3 to be tested, thus allowing for flexible switching of the excitation material to meet the needs of different geological conditions and testing depths.

[0036] The first slider 221 has a threaded hole 2211 on its side wall and a second fixing member 2212 that mates with the threaded hole 2211. The second fixing member 2212 can be a bolt. After the desired striking block 223 is switched by rotating the striking member 22, the second fixing member 2212 is tightened so that its end abuts against the end face of the rotating shaft 222. By adjusting its abutting force, frictional resistance is applied, thereby effectively suppressing the accidental rotation of the striking member 22 during subsequent excitation and ensuring the stability of the specific striking block 223 during the striking process.

[0037] The elastic component 23 includes an abutment plate 231 that abuts against the striking element 22, and an elastic element 232 fixed to the abutment plate 231 at the end opposite to the striking element 22. A fixing plate is provided on the upper part of the guide sleeve 21. The end of the elastic element 232 opposite to the abutment plate 231 is fixed to the fixing plate on the upper part of the guide sleeve 21. The inner wall of the guide sleeve 21 is provided with a guide groove 212 that mates with the abutment plate 231. The abutment plate 231 is generally a metal plate used to push the striking element 22. Its surface in contact with the striking element 22 can be smoothed to reduce friction. The elastic element 232 can be a spring with good elastic properties. The guide groove 212 can be a rectangular groove that matches the edge of the abutment plate 231. Its function is to guide the abutment plate 231 to move precisely in a straight line within the guide sleeve 21, preventing it from deflecting when compressed and rebounding.

[0038] Please refer to the following: Figure 4 , Figure 4 yes Figure 1 Enlarged view of area B; the limiting member 25 includes a second slider 251 that mates with the slot 211 and a third fixing member 252 that is threadedly engaged with the second slider 251. The third fixing member 252 can be a bolt. By tightening the bolt, the third fixing member 252 can tightly abut against the slot 211, thereby easily fixing the limiting member 25 at any position along the length of the slot. When the limiting member 25 is fixed in different positions, the first slider 221 is stopped by the second slider 252 at different positions, thereby changing the end point of the stroke of the striking member 22. This causes the degree of compression of the elastic component 23 to change, and its accumulated elastic potential energy to also change, thus allowing for flexible adjustment of the striking force of the striking member 22 to adapt to different testing requirements.

[0039] The pulling assembly 24 includes a roller 241, a pull rope 242 fixed at both ends to the roller 241 and the first slider 221 respectively, and a driving component 243 that drives the roller 241 to rotate. The pull rope 242 passes through the fixing plate of the telescopic sleeve 21. The roller 241 is usually a metal wheel with an anti-slip surface. The pull rope 242 can be a steel wire rope or a nylon rope, which has high strength and wear resistance. The driving component 243 can be a motor without self-locking characteristics. The rotation of the motor drives the roller 241 to rotate. During the rotation of the roller 241, the first slider 221 is pulled by winding the pull rope 242. When the motor is de-energized, the roller can still rotate under the action of the pull rope 242. The pull rope 242 is provided with a limiting component 25, which guides the pull rope 242, ensuring that the pulling direction is consistent with the movement direction of the striking component 22, thus ensuring the effective transmission of pulling force.

[0040] The pulling component 24 is configured to pull the striking component 22 to compress the elastic component 23 and accumulate elastic potential energy until the striking component 22 is limited by the limiting component 25. After the striking component 22 is limited by the limiting component 25, the pulling component 24 releases the striking component 22. During operation, the driving component 243 is activated, and the pulling component 24 begins to pull the striking component 22 (achieved by pulling the first slider 221). The striking component 22 moves upward and compresses the elastic component 23 behind it, causing the elastic potential energy to gradually increase. When the striking component 22 reaches the end of its stroke, i.e., when it is blocked by the fixed limiting component 25, the pulling component 24 stops pulling and releases the striking component 22. At this instant, the elastic potential energy of the compressed elastic component 23 is released instantaneously, pushing the striking component 22 to move downward at high speed, striking the pile. This process is repeated. Since the stroke of each compression and the characteristics of the elastic component 23 are fixed, it can be ensured that the energy and impact characteristics of each strike by the striking component 22 are highly consistent.

[0041] The implementation principle of this embodiment is as follows: This vibration system adapts to different test surfaces 3 through an adjustable support frame 1, ensuring stable operation of the vibration mechanism 2. The pulling component 24 pulls the striking element 22, compressing the elastic component 23 to accumulate elastic potential energy. When the striking element 22 is limited by the limiting component 25, the elastic potential energy is released, pushing the striking element 22 to strike the pile. The striking force can be changed by adjusting the position of the limiting component 25, and different materials of the striking blocks 223 can be switched by rotating the striking element 22 to excite stress waves of different frequencies. This provides reliable and repeatable data for the integrity testing of piles under the foundation plate.

[0042] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of this application.

Claims

1. A vibration system for detecting the integrity of piles under a foundation slab, characterized in that, include: A support frame (1) is used to place the surface to be measured (3); The vibration mechanism (2) is installed on the support frame (1). The vibration mechanism (2) includes a guide sleeve (21), a striking element (22) disposed inside the guide sleeve (21) and slidably connected to the guide sleeve (21), an elastic component (23) disposed on the striking element (22) away from the surface to be measured (3), a pulling component (24) for pulling the striking element (22) along the length direction of the guide sleeve (21), and a limiting component (25) for limiting the end point of the stroke of the striking element (22). The pulling component (24) is configured to pull the striking member (22) to compress the elastic component (23) and accumulate elastic potential energy until the striking member (22) is limited by the limiting member (25). After the striking member (22) is limited by the limiting member (25), the pulling component (24) releases the striking member (22).

2. The vibration system for detecting the integrity of piles under a foundation slab according to claim 1, characterized in that, The support frame (1) includes multiple support columns (11) and an adjustment plate (12) fixed to the top of the support columns (11). Each support column (11) is fitted with a telescopic sleeve (13) at one end away from the adjustment plate (12) and a first fixing member (131) passing through the telescopic sleeve (13) and threadedly connected to the telescopic sleeve (13). The extended end of the first fixing member (131) abuts against the support column (11).

3. The vibration system for detecting the integrity of piles under a foundation slab according to claim 2, characterized in that, The adjusting plate (12) is equipped with a bubble level (121).

4. The vibration system for detecting the integrity of piles under a foundation slab according to claim 2, characterized in that, The bottom of the telescopic sleeve (13) is fixed with a counterweight plate (132) that is in contact with the surface to be tested (3). The side of the counterweight plate (132) away from the surface to be tested (3) carries a counterweight block (133).

5. The vibration system for detecting the integrity of piles under a foundation slab according to claim 1, characterized in that, The guide sleeve (21) is symmetrically provided with two slots (211), and two first sliders (221) are respectively provided on both sides of the striking member (22), and the two first sliders (221) are slidably connected to the two slots (211) respectively.

6. The vibration system for detecting the integrity of piles under a foundation slab according to claim 5, characterized in that, The striking member (22) has a rotating shaft (222) at both ends that is rotatably connected to the two first sliders (221). The outer circumferential surface of the striking member (22) is provided with a plurality of striking blocks (223) of different materials arranged in a circular array around the axis of the rotating shaft (222).

7. The vibration system for detecting the integrity of piles under a foundation slab according to claim 6, characterized in that, The first slider (221) has a threaded hole (2211) on its side wall and a second fixing member (2212) that cooperates with the threaded hole (2211). The extended end of the second fixing member (2212) abuts against the rotating shaft (222).

8. The vibration system for detecting the integrity of piles under a foundation slab according to claim 5, characterized in that, The elastic component (23) includes an abutment plate (231) that abuts against the striking member (22), and an elastic member (232) fixed to one end of the abutment plate (231) away from the striking member (22). The end of the elastic member (232) away from the abutment plate (231) is fixed to the upper part of the guide sleeve (21). The inner wall surface of the guide sleeve (21) is provided with a guide groove (212) that cooperates with the abutment plate (231).

9. A vibration system for detecting the integrity of piles under a foundation slab according to claim 8, characterized in that, The limiting member (25) includes a second slider (251) that mates with the slot (211) and a third fixing member (252) that is threadedly engaged with the second slider (251). The end of the third fixing member (252) facing away from the second slider (251) abuts against the opening of the slot (211).

10. A vibration system for detecting the integrity of piles under a foundation slab according to claim 5, characterized in that, The pulling assembly (24) includes a roller (241), a pull rope (242) with its two ends fixed to the roller (241) and the first slider (221) respectively, and a driving member (243) for driving the roller (241) to rotate.

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