A device and method for detecting settlement of bored pile foundations

Abstract

This invention belongs to the technical field of testing equipment, specifically a device and method for detecting the settlement of bored pile foundations. It includes a control box and a measuring cable. The measuring cable is housed inside the control box, which contains a cable reeling and unloading mechanism for controlling its movement. One end of the measuring cable is fixedly connected to an inductive probe. The bottom of the control box has a through hole through which the inductive probe passes. By activating an electromagnetic ring to attract a slider, the measuring cable is unloaded, causing it to carry the inductive probe and positioning ring into the settlement tube. The electromagnetic ring is then deactivated, allowing a first spring to push the slider against the inner wall of the settlement tube, thus limiting the positioning ring. As the measuring cable continues to descend, it is positioned by the positioning hole to prevent significant shaking, thereby improving the accuracy of the detection and protecting the inductive probe.

Description

Technical Field

[0001] This invention belongs to the field of testing equipment technology, specifically a device and method for detecting settlement of bored pile foundations. Background Technology

[0002] Drilled piles are a common foundation type in building and bridge engineering. The settlement and deformation of the pile directly determines the overall safety of the structure. Settlement monitoring is a necessary procedure for pile foundation construction acceptance and long-term operation and maintenance. At present, magnetic ring settlement meters are mostly used on construction sites for manual inspection and settlement detection. This device mainly consists of PVC settlement pipes, layered magnetic rings, portable induction probes, and winding distance measuring components.

[0003] During construction, the settlement pipe is tied to the steel cage and lowered into the pile hole. The magnetic ring is sleeved on the outside of the settlement pipe and deforms and settles synchronously with the pile. The inspection personnel insert the induction probe into the hollow settlement pipe, capture the magnetic ring position signal and read the depth value. The settlement difference is calculated by comparing it with the previous benchmark data, thereby judging the vertical settlement of the pile foundation.

[0004] Currently, during testing, the induction probe is raised and lowered inside the settlement tube via a dedicated measuring steel cable. The repeated manual lifting and lowering of the probe can easily cause it to sway and deviate, resulting in frictional expansion against the inner wall of the settlement tube. This not only causes instability and malfunction of the magnetic ring induction signal, but also continuously accumulates human operation errors, directly leading to distortion of the settlement depth detection value. This significantly reduces the accuracy of pile foundation settlement monitoring and is difficult to adapt to the high-precision, continuous settlement observation of ultra-long pile foundations. Therefore, this invention provides a settlement detection device and method for bored cast-in-place pile foundations. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: A borehole pile foundation settlement detection device of the present invention includes a control box and a measuring steel cable. The measuring steel cable is set inside the control box, and the control box is equipped with a cable winding and unwinding mechanism for controlling the movement of the measuring steel cable. One end of the measuring steel cable is fixedly connected to an induction probe. A through hole is opened on the bottom surface of the control box for the induction probe to pass through. A positioning ring is set on the measuring steel cable. A positioning hole is opened in the center of the positioning ring. A pair of first sliding grooves are opened on the side wall of the positioning ring. A slider is set in the first sliding groove. A moving component for controlling the movement of the slider is set on the positioning ring.

[0007] Preferably, the moving component includes an electromagnetic ring fixed in a first slide groove, the electromagnetic ring being magnetically attracted to the slider, and a first spring being fixedly connected between the side of the slider near the positioning hole and the first slide groove.

[0008] Preferably, a second sliding groove is provided inside the positioning ring, and a magnetic plate is slidably connected to the second sliding groove. The magnetic plate is magnetically attracted to the slider, and a set of air vents communicating with the second sliding groove are provided on the outer wall of the positioning ring.

[0009] Preferably, an elastic ring is fixedly connected to the inner wall of the positioning ring, a first hollow groove is formed in the elastic ring, the slider is slidably sealed to the inner wall of the first groove, a first connecting groove is formed in the inner wall of the first groove, and a second connecting groove communicating with the first connecting groove is formed in the outer wall of the elastic ring.

[0010] Preferably, the inner wall of the elastic ring is provided with a set of sliding rods, and an arc-shaped piece is fixedly connected to the end of the sliding rod away from the elastic ring, and a roller is rotatably connected to the arc-shaped piece.

[0011] Preferably, the elastic ring has a second hollow groove, a set of fixing rods are fixedly connected in the second hollow groove, a third sliding groove is formed at the end of the fixing rod away from the first hollow groove, the sliding rod is slidably connected to the inner wall of the third sliding groove, a circular hole communicating with the first sliding groove is formed on the outer wall of the fixing rod, a second spring is fixedly connected between the end of the sliding rod away from the roller and the inner wall of the third sliding groove, and a pair of pressure sensors are fixedly connected in the second hollow groove.

[0012] Preferably, the wire take-up and release mechanism includes a motor fixed in the control box, with a wire roller fixedly connected to the output end of the motor, and the top end of the measuring steel cable fixedly connected to the wire roller.

[0013] Preferably, the control box has a rectangular groove communicating with the through hole, and a baffle is slidably connected to the rectangular groove.

[0014] Preferably, a disc is fixedly connected to the inner wall of the control box away from the motor, and the disc is open at the end closest to the motor. A movable disc is slidably connected to the inner wall of the disc, and a set of first magnetic blocks is fixedly connected to the side of the movable disc closest to the motor. A set of second magnetic blocks is fixedly connected to the side of the roller closest to the disc. The first and second magnetic blocks are arranged to repel each other. A connecting pipe connects the rectangular groove to the inside of the disc. A third spring is fixedly connected between the side of the baffle closest to the connecting pipe and the inner wall of the rectangular groove. A set of fourth springs is fixedly connected between the side of the movable disc away from the roller and the inner wall of the disc.

[0015] A method for detecting settlement of bored pile foundations, the method employing the aforementioned bored pile foundation settlement detection device, the method comprising the following steps: S1: Securely tie the PVC settlement pipe to the inside of the cast-in-place pile reinforcement cage, install corresponding settlement magnetic rings on the outer wall of the settlement pipe in layers according to the soil depth, and lower it to the specified depth of the pile hole simultaneously with the reinforcement cage. Pour concrete to make the settlement pipe and the pile body tightly bonded into an integral structure. S2: After the concrete of the pile body has fully solidified and the strength has stabilized, place the control box above the pile body and at the same time place the induction probe above the settlement pipe. Then, start the electromagnetic ring to attract the slider, so that the slider pushes the gas in the first groove into the elastic ring, so that the elastic ring expands and squeezes the measuring steel cable. S3: By controlling the rotation of the rollers by the motor to lower the measuring steel cable, the induction probe and the positioning ring move along with the measuring steel cable, and the positioning ring enters the settling pipe; S4: After the positioning ring enters the settling tube, the electromagnetic ring is closed. Then the first spring will push the slider against the settling tube, thereby positioning the positioning ring inside the settling tube so that the positioning ring can position the measuring steel cable. S5: Continue to lower the induction probe so that it reads the initial depth data of each level of magnetic ring in sequence. Archive the data uniformly as a benchmark for subsequent settlement comparison. Calculate the difference between the measured depth of each point and the initial benchmark value to accurately determine the vertical layered settlement of the pile body and determine whether the overall settlement of the pile foundation meets the safety requirements of the specifications.

[0016] The beneficial effects of this invention are as follows: 1. This invention activates an electromagnetic ring to attract a slider, which then lowers a measuring cable, allowing the cable to carry the induction probe and positioning ring into the settling tube. The electromagnet is then deactivated, allowing a first spring to push the slider against the inner wall of the settling tube, thus limiting the positioning ring. As the measuring cable continues to be lowered, it is positioned by the positioning hole to prevent significant swaying, thereby improving detection accuracy and protecting the induction probe.

[0017] 2. In this invention, when the electromagnetic ring is closed, the slider is pushed by the first spring to move. At this time, the magnetic plate will move with the slider, causing the slider to push the gas in the second groove to be ejected from the air outlet. The gas will be sprayed onto the inner wall of the slider that is about to contact the settling tube, so as to blow away the impurities on the inner wall of the settling tube and avoid the impurities from affecting the stability of the slider on the settling tube. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the control box structure of the present invention; Figure 2 yes Figure 1 A structural diagram from another perspective; Figure 3This is a schematic diagram of the positioning ring in this invention; Figure 4 This is a schematic diagram of the internal structure of the positioning ring in this invention; Figure 5 yes Figure 4 Enlarged view of point A; Figure 6 This is a schematic diagram of the internal structure of the elastic ring in this invention; Figure 7 This is a schematic diagram of the internal structure of the control box in this invention; Figure 8 This is a flowchart of the method in this invention.

[0020] In the diagram: 1. Control box; 2. Induction probe; 3. Through hole; 4. Measuring cable; 5. Positioning ring; 6. Elastic ring; 7. First slide groove; 8. Slider; 9. Electromagnetic ring; 10. Second slide groove; 11. Magnetic plate; 12. Air outlet; 13. First hollow groove; 14. First connecting groove; 15. Second connecting groove; 16. First spring; 17. Arc-shaped piece; 18. Roller; 19. Slide rod; 20. Third slide groove; 21. Second spring; 22. Fixed rod; 23. Pressure sensor; 24. Second hollow groove; 25. Positioning hole; 26. Motor; 27. Wire roller; 28. Third spring; 29. ​​Baffle; 30. Disc; 31. Moving disc; 32. First magnetic block; 33. Second magnetic block; 34. Connecting pipe; 35. Fourth spring. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example 1: As Figures 1 to 6 As shown in the embodiment of the present invention, a settlement detection device for bored pile foundation includes a control box 1 and a measuring steel cable 4. The measuring steel cable 4 is disposed inside the control box 1, which is equipped with a cable winding and unwinding mechanism for controlling the movement of the measuring steel cable 4. One end of the measuring steel cable 4 is fixedly connected to an induction probe 2. A through hole 3 is provided on the bottom surface of the control box 1 for the induction probe 2 to pass through. A positioning ring 5 is provided on the measuring steel cable 4. A positioning hole 25 is provided in the center of the positioning ring 5. A pair of first sliding grooves 7 are provided on the side wall of the positioning ring 5. A slider 8 is disposed in the first sliding grooves 7. A moving component for controlling the movement of the slider 8 is provided on the positioning ring 5. In this application, when conducting pile settlement detection, the control box 1 is placed above the pile, and the induction probe 2 is positioned above the settlement tube, which is located at the center of the pile. The measuring cable 4 is then released via a cable reeling mechanism, allowing it to pull the induction probe 2 into the settlement tube. Simultaneously, the positioning ring 5 follows the cable 4 into the settlement tube. The moving component then controls the slider 8 to move, causing it to press against the inner wall of the settlement tube, thus limiting the positioning ring 5. When the measuring cable 4 is lowered further, it is positioned by the positioning hole 25 to prevent significant shaking, improving detection accuracy and protecting the induction probe 2. During the lowering process, the induction probe 2 accurately senses the position of the positioning magnetic ring and records the current depth measurement value in real time. The difference between the measured depth at each point and the initial benchmark value is then calculated to accurately determine the vertical layered settlement of the pile, thus determining whether the overall pile settlement meets the safety requirements of the specifications.

[0023] The moving component includes an electromagnetic ring 9 fixed in the first slide groove 7. The electromagnetic ring 9 is magnetically attracted to the slider 8. A first spring 16 is fixedly connected between the side of the slider 8 near the positioning hole 25 and the first slide groove 7. Before the positioning ring 5 enters the settling tube, the electromagnet can be activated to attract the slider 8 into the first slide groove 7. After the positioning ring 5 enters the settling tube, the electromagnet is turned off. At this time, the first spring 16 will push the slider 8 against the settling tube, thereby positioning the positioning ring 5 in the settling tube.

[0024] The positioning ring 5 has a second sliding groove 10, and a magnetic plate 11 is slidably connected to the second sliding groove 10. The magnetic plate 11 is magnetically attracted to the slider 8. The outer wall of the positioning ring 5 has a set of air outlet holes 12 that communicate with the second sliding groove 10. When the electromagnetic ring 9 is closed, the slider 8 is pushed by the first spring 16 to move. At this time, the magnetic plate 11 will move with the slider 8, so that the slider 8 pushes the gas in the second sliding groove 10 to be ejected from the air outlet holes 12. At this time, the gas will be sprayed on the inner wall of the slider 8 that is about to contact the settling tube, so as to blow away the impurities on the inner wall of the settling tube and avoid the impurities affecting the stability of the slider 8 on the settling tube.

[0025] An elastic ring 6 is fixedly connected to the inner wall of the positioning ring 5. A first hollow groove 13 is provided in the elastic ring 6. The slider 8 is slidably connected to the inner wall of the first sliding groove 7. A first connecting groove 14 is provided in the inner wall of the first sliding groove 7. A second connecting groove 15 communicating with the first connecting groove 14 is provided in the outer wall of the elastic ring 6. When the measuring steel cable 4 is lowered in this application, the electromagnetic ring 9 can be activated first to attract the slider 8. At this time, the slider 8 will push the gas in the first sliding groove 7. The gas will pass through the first connecting groove 14 and the second connecting groove 15, and then enter the elastic ring 6, allowing the elastic ring 6 to expand and squeeze onto the measuring steel cable 4. At this time, when the measuring steel cable 4 is lowered, the positioning ring 5 will move synchronously with the measuring steel cable 4.

[0026] The inner wall of the elastic ring 6 is provided with a set of sliding rods 19. An arc-shaped piece 17 is fixedly connected to the end of the sliding rod 19 away from the elastic ring 6. A roller 18 is rotatably connected to the arc-shaped piece 17. When the measuring steel cable 4 in this application is lowered, the measuring steel cable 4 will roll against the roller 18. On the one hand, the measuring steel cable 4 can be further positioned. On the other hand, it can prevent the measuring steel cable 4 from sticking to the elastic ring 6 during lowering, which would cause unavoidable wear to the elastic ring 6.

[0027] The elastic ring 6 has a second hollow groove 24, and a set of fixing rods 22 are fixedly connected in the second hollow groove 24. The end of the fixing rod 22 away from the first hollow groove 13 has a third sliding groove 20. The sliding rod 19 is slidably connected to the inner wall of the third sliding groove 20. The outer wall of the fixing rod 22 has a round hole communicating with the first sliding groove 7. The end of the sliding rod 19 away from the roller 18 is fixedly connected to the inner wall of the third sliding groove 20 with a second spring 21. A pair of pressure sensors 23 are fixedly connected in the second hollow groove 24. During the lowering process, the measuring cable 4 in this application will inevitably sway. When the measuring cable 4 sways, it will push the roller 18, which in turn pushes the slide bar 19. At this time, the slide bar 19 will push the gas in the third slide groove 20, causing the gas to be discharged from the round hole into the second hollow groove 24. At this time, the pressure sensor 23 will sense the pressure change. If the swaying amplitude of the measuring cable 4 is large, the pressure sensor 23 will sense a greater pressure change. When a certain value is reached, an external alarm will be triggered to prompt the staff to reduce the lowering speed of the measuring cable 4.

[0028] Example 2: Figure 7As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the wire feeding and take-up mechanism includes a motor 26 fixed in the control box 1, the output end of the motor 26 is fixedly connected to a wire roller 27, and the top end of the measuring steel cable 4 is fixedly connected to the wire roller 27; when wire feeding is required, the motor 26 controls the wire roller 27 to rotate forward, at which time the measuring cable on the wire roller 27 will be fed out; when the motor 26 controls the wire roller 27 to rotate in reverse, the measuring cable will be taken back.

[0029] The control box 1 has a rectangular groove communicating with the through hole 3, and a baffle 29 is slidably connected in the rectangular groove. When the measuring steel cable 4 in this application is being wound up, the positioning ring 5 and the sensing probe 2 will enter the control box 1, and then be blocked at the through hole 3 by the moving baffle 29. At this time, the positioning ring 5 and the sensing probe 2 will be blocked by the baffle 29, thereby storing the positioning ring 5 and the sensing probe 2 in the control box 1.

[0030] A disc 30 is fixedly connected to the inner wall of the control box 1 away from the motor 26. The disc 30 is open at one end near the motor 26. A movable disc 31 is slidably connected to the inner wall of the disc 30. A set of first magnetic blocks 32 is fixedly connected to the side of the movable disc 31 near the motor 26. A set of second magnetic blocks 33 is fixedly connected to the side of the roller 27 near the disc 30. The first magnetic blocks 32 and the second magnetic blocks 33 are arranged to repel each other. A connecting pipe 34 connects the rectangular groove and the inside of the disc 30. A third spring 28 is fixedly connected between the side of the baffle 29 near the connecting pipe 34 and the inner wall of the rectangular groove. A set of fourth springs 35 is fixedly connected between the side of the movable disc 31 away from the roller 27 and the inner wall of the disc 30. After the positioning ring 5 and the sensing probe 2 enter the control box 1, the control roller 27 rotates, aligning the second magnetic block 33 on the roller 27 with the first magnetic block 32. At this time, the first magnetic block 32 is pushed, causing the moving disk 31 to push the gas in the disc 30 from the connecting pipe 34 into the rectangular groove. The gas pushes the baffle 29 to block the through hole 3. When the baffle 29 needs to be moved away from the through hole 3, the control roller 27 is set so that the second magnetic block 33 and the first magnetic block 32 are misaligned. At this time, the third spring 28 pulls the baffle 29 to reset. When winding and unwinding the wire, the second magnetic block 33 on the roller 27 will quickly pass the first magnetic block 32, which is insufficient to push the moving disk 31 to move a certain distance. The above mechanism can automatically control the movement of the baffle 29.

[0031] like Figure 8 As shown, a method for detecting the settlement of bored pile foundations is described. This method uses the aforementioned device for detecting the settlement of bored pile foundations and includes the following steps: S1: Securely tie the PVC settlement pipe to the inside of the cast-in-place pile reinforcement cage, install corresponding settlement magnetic rings on the outer wall of the settlement pipe in layers according to the soil depth, and lower it to the specified depth of the pile hole simultaneously with the reinforcement cage. Pour concrete to make the settlement pipe and the pile body tightly bonded into an integral structure. S2: After the concrete of the pile body has fully solidified and the strength has stabilized, place the control box 1 above the pile body, and at the same time place the induction probe 2 above the settlement pipe. Then, start the electromagnetic ring 9 to attract the slider 8, so that the slider 8 pushes the gas in the first groove 7 into the elastic ring 6, so that the elastic ring 6 expands and squeezes the measuring steel cable 4. S3: By controlling the rotation of the wire roller 27 by the motor 26, the measuring steel cable 4 is lowered, and the induction probe 2 and the positioning ring 5 move along with the measuring steel cable 4. The positioning ring 5 enters the settling pipe. S4: After the positioning ring 5 enters the settling tube, the electromagnetic ring 9 is closed. Then the first spring 16 will push the slider 8 against the settling tube, thereby positioning the positioning ring 5 inside the settling tube so that the positioning ring 5 can position the measuring steel cable 4. S5: Continue to lower the induction probe 2, allowing it to read the initial depth data of each level of magnetic ring in sequence. The data is then archived as a benchmark for subsequent settlement comparison. The difference between the measured depth at each point and the initial benchmark value is calculated to accurately determine the vertical layered settlement of the pile body and to determine whether the overall settlement of the pile foundation meets the safety requirements of the specifications.

[0032] Working principle: By placing the control box 1 above the pile body and the induction probe 2 above the settlement tube, which is located at the center of the pile body, the measuring steel cable 4 is released through the cable release mechanism, allowing the measuring steel cable 4 to carry the induction probe 2 into the settlement tube. At the same time, the positioning ring 5 also follows the measuring steel cable 4 into the settlement tube. Then, the moving component controls the slider 8 to move, so that the slider 8 abuts against the inner wall of the settlement tube, thereby limiting the positioning ring 5. When the measuring steel cable 4 is lowered, it will be positioned by the positioning hole 25 to prevent large-scale shaking, thereby improving the accuracy of the detection and protecting the induction probe 2. During the lowering process, the induction probe 2 accurately senses the position of the positioning magnetic ring and records the current depth measurement value in real time. Then, the difference between the actual depth of each point and the initial benchmark value is calculated to accurately determine the vertical layered settlement of the pile body and determine whether the overall settlement of the pile foundation meets the safety requirements of the specifications. Before the positioning ring 5 enters the settling tube, the electromagnet can be activated to attract the slider 8 into the first groove 7. After the positioning ring 5 enters the settling tube, the electromagnet is turned off. At this time, the first spring 16 will push the slider 8 against the settling tube, thereby positioning the positioning ring 5 inside the settling tube. When the electromagnetic ring 9 is closed, the slider 8 will be pushed by the first spring 16 to move. At this time, the magnetic plate 11 will move with the slider 8, causing the slider 8 to push the gas in the second groove 10 to be ejected from the air outlet 12. The gas will be sprayed onto the inner wall of the slider 8 that is about to contact the settling tube to blow away impurities on the inner wall of the settling tube and prevent impurities from affecting the stability of the slider 8 on the settling tube. When the measuring cable 4 is lowered in this application, the electromagnetic ring 9 can be activated first to attract the slider 8. At this time, the slider 8 will push the gas in the first groove 7. The gas will then pass through the first connecting groove 14 and the second connecting groove 15, and then enter the elastic ring 6, causing the elastic ring 6 to expand and squeeze onto the measuring cable 4. When the measuring cable 4 is lowered, the positioning ring 5 will move synchronously with the measuring cable 4. When the measuring cable 4 is lowered in this application, the measuring cable 4 will roll in close contact with the roller 18. On the one hand, this can further position the measuring cable 4, and on the other hand, it can prevent the measuring cable 4 from sticking to the elastic ring 6 during lowering, which would cause unavoidable wear to the elastic ring 6. During the lowering process, the measuring cable 4 in this application will inevitably sway. When the measuring cable 4 sways, it will push the roller 18, which in turn pushes the slide bar 19. At this time, the slide bar 19 will push the gas in the third slide groove 20, causing the gas to be discharged from the round hole into the second hollow groove 24. At this time, the pressure sensor 23 will sense the pressure change. If the swaying amplitude of the measuring cable 4 is large, the pressure sensor 23 will sense a greater pressure change. When a certain value is reached, an external alarm will be triggered to prompt the staff to reduce the lowering speed of the measuring cable 4.

[0033] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0034] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A settling detection device for bored pile foundation, comprising a control box (1) and a measuring steel cable (4), wherein the measuring steel cable (4) is disposed in the control box (1), and the control box (1) is provided with a cable winding and unwinding mechanism for controlling the movement of the measuring steel cable (4); Its features are: One end of the measuring steel cable (4) is fixedly connected to the induction probe (2), and the bottom surface of the control box (1) is provided with a through hole (3) for the induction probe (2) to pass through. The measuring steel cable (4) is provided with a positioning ring (5), the center of the positioning ring (5) is provided with a positioning hole (25), the side wall of the positioning ring (5) is provided with a pair of first sliding grooves (7), the first sliding grooves (7) are provided with a slider (8), and the positioning ring (5) is provided with a moving component for controlling the slider (8) to move.

2. The settling detection device for bored pile foundations according to claim 1, characterized in that: The moving component includes an electromagnetic ring (9) fixed in the first slide groove (7), the electromagnetic ring (9) and the slider (8) are magnetically attracted to each other, and a first spring (16) is fixedly connected between the side of the slider (8) near the positioning hole (25) and the first slide groove (7).

3. The settling detection device for bored pile foundations according to claim 2, characterized in that: The positioning ring (5) has a second sliding groove (10) inside, and a magnetic plate (11) is slidably connected inside the second sliding groove (10). The magnetic plate (11) is magnetically attracted to the slider (8). The outer wall of the positioning ring (5) has a set of air vents (12) that communicate with the second sliding groove (10).

4. The settling detection device for bored pile foundations according to claim 2, characterized in that: The inner wall of the positioning ring (5) is fixedly connected to an elastic ring (6). A first hollow groove (13) is provided in the elastic ring (6). The slider (8) is sealed and slidably connected to the inner wall of the first sliding groove (7). A first connecting groove (14) is provided in the inner wall of the first sliding groove (7). A second connecting groove (15) communicating with the first connecting groove (14) is provided in the outer wall of the elastic ring (6).

5. The settling detection device for bored pile foundations according to claim 4, characterized in that: The inner wall of the elastic ring (6) is provided with a set of slide rods (19), and an arc-shaped piece (17) is fixedly connected to the end of the slide rod (19) away from the elastic ring (6), and a roller (18) is rotatably connected to the arc-shaped piece (17).

6. The settling detection device for bored pile foundations according to claim 5, characterized in that: The elastic ring (6) has a second hollow groove (24) inside. A set of fixed rods (22) are fixedly connected inside the second hollow groove (24). A third sliding groove (20) is opened at the end of the fixed rod (22) away from the first hollow groove (13). The sliding rod (19) is sealed and slidably connected to the inner wall of the third sliding groove (20). A round hole communicating with the first sliding groove (7) is opened on the outer wall of the fixed rod (22). A second spring (21) is fixedly connected between the end of the sliding rod (19) away from the roller (18) and the inner wall of the third sliding groove (20). A pair of pressure sensors (23) are fixedly connected inside the second hollow groove (24).

7. The settling detection device for bored pile foundations according to claim 1, characterized in that: The wire take-up and take-down mechanism includes a motor (26) fixed in the control box (1), and a wire roller (27) is fixedly connected to the output end of the motor (26). The top end of the measuring steel cable (4) is fixedly connected to the wire roller (27).

8. The settling detection device for bored pile foundations according to claim 7, characterized in that: The control box (1) has a rectangular groove that communicates with the through hole (3), and a baffle (29) is slidably connected in the rectangular groove.

9. The settlement detection device for bored pile foundations according to claim 8, characterized in that: A disc (30) is fixedly connected to the inner wall of the control box (1) away from the motor (26). The disc (30) is open at one end near the motor (26). A movable disc (31) is slidably connected to the inner wall of the disc (30). A set of first magnetic blocks (32) is fixedly connected to the side of the movable disc (31) near the motor (26). A set of second magnetic blocks (33) is fixedly connected to the side of the roller (27) near the disc (30). The first magnetic blocks (32) and the second magnetic blocks (33) are arranged to repel each other. A connecting pipe (34) connects the rectangular groove and the inside of the disc (30). A third spring (28) is fixedly connected between the side of the baffle (29) near the connecting pipe (34) and the inner wall of the rectangular groove. A set of fourth springs (35) is fixedly connected between the side of the movable disc (31) away from the roller (27) and the inner wall of the disc (30).

10. A method for detecting settlement of bored pile foundations, the method employing a bored pile foundation settlement detection device as described in any one of claims 1-9, characterized in that: The method includes the following steps: S1: Securely tie the PVC settlement pipe to the inside of the cast-in-place pile reinforcement cage, install corresponding settlement magnetic rings on the outer wall of the settlement pipe in layers according to the soil depth, and lower it to the specified depth of the pile hole simultaneously with the reinforcement cage. Pour concrete to make the settlement pipe and the pile body tightly bonded into an integral structure. S2: After the concrete of the pile body has fully solidified and the strength has stabilized, place the control box (1) above the pile body, and at the same time place the induction probe (2) above the settlement pipe. Then start the electromagnetic ring (9) to attract the slider (8), and let the slider (8) push the gas in the first groove (7) into the elastic ring (6), so that the elastic ring (6) expands and squeezes the measuring steel cable (4). S3: By controlling the rotation of the wire roller (27) by the motor (26) to lower the measuring steel cable (4), the induction probe (2) and the positioning ring (5) follow the measuring steel cable (4) to move the positioning ring (5) into the settling pipe; S4: After the positioning ring (5) enters the settling tube, the electromagnetic ring (9) is closed. Then the first spring (16) will push the slider (8) against the settling tube, thereby positioning the positioning ring (5) inside the settling tube so that the positioning ring (5) can position the measuring steel cable (4). S5: Continue to lower the induction probe (2) so that the induction probe (2) reads the initial depth data of each level of magnetic ring in sequence and archives them uniformly as the basis for subsequent settlement comparison. The difference between the measured depth of each point and the initial benchmark value is calculated to accurately obtain the vertical layered settlement of the pile body and determine whether the overall settlement of the pile foundation meets the safety requirements of the specifications.

Images