Pile integrity detection device and detection method

Abstract

The present application relates to a pile foundation integrity detection device and method, belonging to the technical field of pile foundation detection. The device comprises four transducers, data transmission lines respectively connected to the transducers, and a waveform detector, wherein each data transmission line is connected to the waveform detector. The device also comprises a support rod, a measuring assembly, and a wire-laying assembly, wherein the measuring assembly and the wire-laying assembly are respectively mounted at both ends of the support rod. The wire-laying assembly is used to retract and release the data transmission line. The measuring assembly comprises a first measuring plate and a second measuring plate for measuring the center distance between two acoustic detection tubes on a diagonal line. The first measuring plate and the second measuring plate are also provided with a scale for detecting the center distance between two acoustic detection tubes on a non-diagonal line. The present application has the effect of improving the efficiency of pile foundation detection.

Description

Technical Field

[0001] The present application relates to the field of pile foundation detection, and in particular to a pile foundation integrity detection device and detection method. Background Art

[0002] The detection of pile integrity is a very necessary task. It can reflect the integrity, bearing capacity and normal use of the piles through the detection results. It is an important way to ensure the safety of buildings.

[0003] At present, the detection methods for pile foundation integrity usually include low-strain method, high-strain method, core drilling method and ultrasonic transmission method. Among them, the ultrasonic transmission method is to lower the transducer at a uniform speed through the acoustic detection tube pre-buried on the pile foundation, detect the pile foundation by sound wave transmission, and transmit the corresponding signal to the waveform detector to generate the corresponding waveform diagram for staff to read and thus judge the integrity of the pile foundation.

[0004] However, when the integrity of the pile foundation is detected by the ultrasonic wave projection method, it is often necessary to measure the distance between the two acoustic detection tubes to ensure that the distance between the two acoustic detection tubes is within the range of the ultrasonic projection of the transducer, and then input the measured value into the waveform detector so that the waveform diagram generated by the waveform detector can accurately provide feedback on the integrity of the pile foundation. If there are only two acoustic detection tubes on the pile foundation, it is only necessary to use a caliper to measure the outer diameter of the acoustic detection tube and then use a tape measure to measure the distance between the outer diameters of the two acoustic detection tubes to obtain the center distance between the two acoustic detection tubes. However, if the number of acoustic detection tubes on the pile foundation is more, for example, four, it is necessary to use a tape measure to measure the center distance between the four acoustic detection tubes one by one, which will take more time, thereby affecting the detection efficiency of the integrity of the pile foundation. Summary of the Invention

[0005] In order to improve the efficiency of pile integrity detection, in a first aspect, the present application provides a pile integrity detection device, which adopts the following technical solutions:

[0006] It includes four transducers, data transmission lines connected to the transducers respectively, and a waveform detector, each data transmission line is connected to the waveform detector. In addition, it also includes a support rod, a measuring component and a pay-off component, the measuring component and the pay-off component are respectively installed at both ends of the support rod, the pay-off component is used to retract and release the data transmission lines, the measuring component includes measuring plate 1 and measuring plate 2, measuring plate 1 and measuring plate 2 are both mounted on the support rod and can rotate around the axis of the support rod, measuring plate 1 and measuring plate 2 are both provided with scale lines, and the 0 scale on the scale lines coincides with the support rod; both ends of measuring plate 1 and measuring plate 2 are provided with shaft sleeves, each shaft sleeve is provided with a scale and can rotate around the axis of the shaft sleeve, the end of the scale on measuring plate 1 and the end of the scale on measuring plate 2 away from the shaft sleeve can respectively abut the outer wall of different acoustic detection tubes.

[0007] By adopting the above technical solution, before testing the integrity of the foundation piles, the support rod is first placed between the four acoustic detection tubes, and then the angles of the measuring plate 1 and the measuring plate 2 on the support rod are adjusted so that the two shaft sleeves on the measuring plate 1 are respectively mounted on the two acoustic detection tubes on the two diagonals, and the two shaft sleeves on the measuring plate 2 are respectively mounted on the two acoustic detection tubes on the other diagonal. There are scale lines on both the measuring plate 1 and the measuring plate 2, and the 0 scale position of the scale line coincides with the axis of the support rod, and the remaining scales gradually increase from the 0 scale line toward both sides. The staff first reads the values ​​on the two acoustic detection tubes on the diagonals from the measuring plate 1, and adds them up to get the value. The distance between the two acoustic detection tubes on the diagonal line can be obtained. Similarly, the distance between the other two acoustic detection tubes on the other diagonal line can be measured by measuring plate 2. When the positions of measuring plate 1 and measuring plate 2 are fixed, the scale is rotated so that the scale abuts against the outer wall of the acoustic detection tube, and the distance between the two acoustic detection tubes on the non-diagonal line is read according to the scale value on the scale. The whole process can realize the rapid acquisition of the distance between two acoustic detection tubes among four acoustic detection tubes through the mechanical structure, without the need to first measure the outer wall distance between the two acoustic detection tubes with a ruler and then measure the outer wall diameter of the acoustic detection tube with a caliper, thereby achieving the effect of improving the efficiency of the integrity detection of the foundation piles.

[0008] Optionally, both measuring plate 1 and measuring plate 2 include a connecting portion and two telescopic portions, the connecting portion being used for rotationally connecting to the support rod, the two telescopic portions being located at both ends of the connecting portion and being able to slide along the length direction of the connecting portion, and the shaft sleeve being installed on the telescopic portion.

[0009] By adopting the above technical solution, measuring plate one and measuring plate two respectively include a connecting part and two telescopic parts. The two telescopic parts are respectively located at both ends of the connecting part and can slide along the length direction of the connecting part. This allows the protruding length of the telescopic part on the connecting part to be adjusted according to the distance between the two acoustic detection tubes on the diagonal line, thereby being suitable for two acoustic detection tubes at different distances on the diagonal line.

[0010] Optionally, the scale includes a measuring part 1 and a measuring part 2, the measuring part 1 is connected to the shaft sleeve, the measuring part 2 is used to abut against the outer wall of another shaft sleeve, and the measuring part 2 can slide on the measuring part 1 along the length direction of the measuring part 1.

[0011] By adopting the above technical solution, the measuring part 2 can slide on the measuring part 1, which enables the extension distance of the measuring part 2 on the measuring part 1 to be adjusted, so that the extension length of the measuring part 2 on the measuring part 1 can be adjusted according to the distance between the two acoustic detection tubes on the non-diagonal line, thereby being suitable for two acoustic detection tubes with different distances on the non-diagonal line.

[0012] Optionally, an arc-shaped abutting portion is provided at one end of the measuring portion 2 away from the measuring portion 1, the arc of the abutting portion is a quarter of a circle, and the abutting portion is adapted to the arc of the outer wall of the acoustic detection tube.

[0013] By adopting the above technical solution, a contact portion with a quarter-circular arc shape is provided on the measuring part 2, and the curvature of the contact portion is adapted to the outer wall of the acoustic detection tube. This allows the end of the measuring part 2 to be exactly in the same straight line with the central axis of the acoustic detection tube when the measuring part 2 abuts against the outer wall of the acoustic detection tube, thereby improving the accuracy of the measuring part 1 and the measuring part 2 for the two acoustic detection tubes on the non-diagonal line.

[0014] Optionally, the pay-off assembly includes a winding wheel, four sliding members, four telescopic arms and pulleys corresponding to the number of telescopic arms. A sliding groove surrounding the axis of the support rod is provided on the outer wall of the support rod. The four sliding members are all located in the sliding groove and can slide in the sliding groove. One end of the telescopic arm is fixedly connected to the sliding member, and the other end of the telescopic arm is provided with a threading hole. The pulley ball is hinged to the end of the telescopic arm with the threading hole, and the winding wheel is installed on the support rod.

[0015] By adopting the above technical solution, the data transmission line is connected to the transducer and the transducer is lowered and lowered through the threading hole. The pulley prevents the data transmission line from rubbing against the edge of the threading hole to reduce the wear rate of the data transmission line surface. When all transducers enter different acoustic detection tubes respectively, all data transmission lines are wound on the winding wheel. The winding wheel facilitates the staff to synchronously retract and release the transducers, thereby realizing uniform movement of the transducer in the acoustic detection tube when working. The sliding part and the slide groove enable the telescopic arm to be suitable for acoustic detection tubes arranged at different angles, which is more flexible.

[0016] Optionally, the telescopic arm includes telescopic arm one and telescopic arm two, the telescopic arm one is connected to the sliding member, the threading hole is set at the end of the telescopic arm two away from the telescopic arm one, the pulley ball is hinged on the telescopic arm two, and a set of telescopic arms is set on the telescopic arm two. The telescopic arm two can slide along the length direction of the telescopic arm one. A positioning hole is provided on the telescopic arm one, and a positioning bolt is passed through the positioning hole. After the positioning bolt is connected to the telescopic arm one by threaded cooperation, it can abut against the outer wall of the telescopic arm two. The threading hole is located at the end of the telescopic arm two away from the telescopic arm one, and the pulley is installed on the telescopic arm two.

[0017] By adopting the above technical solution, the telescopic arm two can slide on the telescopic arm one along the length direction of the telescopic arm one, so that the position of the threading hole on the telescopic arm two can be adjusted by adjusting the extended length of the telescopic arm two on the telescopic arm one, so that the threading hole can be adapted to the position of the acoustic detection tube, and the transducer can be placed vertically in the acoustic detection tube. At the same time, the positioning bolt abuts against the outer wall of the telescopic arm two after passing through the telescopic arm one, so as to prevent the extended length of the telescopic arm two on the telescopic arm one from changing easily after the adjustment is completed.

[0018] Optionally, the telescopic arm 1 is hinged to the sliding member, and the axis direction of the hinge shaft between the telescopic arm 1 and the sliding member is perpendicular to the axis of the support rod.

[0019] By adopting the above technical solution, the telescopic arm can be folded by rotating around the axis of the hinge shaft when not in use, so as to be stored, thereby reducing the occupied space.

[0020] In a second aspect, the present application further provides a method for detecting pile integrity, using the above-mentioned pile integrity detection device, comprising the following steps:

[0021] S100: placing one end of the support rod provided with the measuring assembly on the foundation pile.

[0022] S200: The shaft sleeves on the first measuring plate and the shaft sleeves on the second measuring plate are respectively mounted on different acoustic detection tubes on the foundation pile;

[0023] S300: Rotate the scales on the first and second measuring plates respectively so that each scale abuts against an outer wall of a different acoustic testing tube;

[0024] S400: Read the distance between the shaft sleeves at both ends of the measuring plate and the axis of the support rod, and the distance between the two ends of the measuring plate and the axis of the support rod; then read the distance when the scale abuts against the outer wall of the acoustic testing tube after rotation;

[0025] S500: Input the read values ​​into the waveform detector one by one, and place the transducers into the acoustic detection tubes on the foundation piles one by one for detection;

[0026] S600: judging the integrity of the pile foundation according to the waveform diagram transmitted by the transducer to the waveform detector.

[0027] In summary, this application has at least the following beneficial technical effects:

[0028] 1. By providing a first measuring plate and a second measuring plate, the first measuring plate and the second measuring plate can measure the distance between two acoustic detection pipes on a diagonal line. At the same time, the scales sleeved on the first measuring plate and the second measuring plate are rotated respectively so that the scale on the first measuring plate abuts against the outer wall of the acoustic detection pipe and the scale on the second measuring plate abuts against the outer wall of the other acoustic detection pipe. In this way, the distance between two acoustic detection pipes on a non-diagonal line can be measured. This eliminates the need to measure two different acoustic detection pipes multiple times, thereby improving the efficiency of pile foundation detection.

[0029] 2. By hingedly connecting the telescopic arm 1 to the sliding member, and the axis of the hinge shaft between the telescopic arm 1 and the sliding member is perpendicular to the axis of the support rod, the telescopic arm 1 can be folded by rotating around the axis of the hinge shaft when not in use, thereby achieving the effect of reducing the occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a three-dimensional schematic diagram of a pile integrity detection device of the present application;

[0031] Figure 2 yes Figure 1 Schematic diagram of the measuring component;

[0032] Figure 3 yes Figure 1 Schematic diagram of the center line assembly.

[0033] Explanation of reference numerals: 1. transducer; 2. data transmission line; 3. waveform detector; 4. support rod; 5. measuring assembly; 6. pay-off assembly; 7. measuring plate 1; 8. measuring plate 2; 9. scale mark; 10. bushing; 11. scale ruler; 12. connecting portion; 13. telescopic portion; 14. measuring portion 1; 15. measuring portion 2; 16. abutting portion; 17. take-up wheel; 18. sliding member; 19. telescopic arm; 20. chute; 21. threading hole; 22. telescopic arm 1; 23. telescopic arm 2; 24. positioning bolt; 25. acoustic detection tube; 26. foundation pile; 27. pulley; DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-3 This application is described in further detail.

[0035] Example 1:

[0036] Example 1 of the present application discloses a pile integrity detection device, referring to Figure 1-2Four rectangularly distributed acoustic detection tubes 25 are arranged on the top of the foundation pile 26. The acoustic detection tubes 25 are pre-buried in the foundation pile 26. The foundation pile 26 detection device provided in this application is located between the four acoustic detection tubes 25, including four transducers 1, four data transmission lines 2 connected to the transducers 1 respectively, and a waveform detector 3. The ends of the four data transmission lines 2 away from the transducers 1 are all connected to the waveform detector 3. In addition, it also includes a support rod 4, a measuring component 5 and a wire-laying component 6. The measuring component 5 and the wire-laying component 6 are respectively located at the two ends of the support rod 4. When the support rod 4 is placed on the foundation pile 26, the measuring component 5 is located below the wire-laying component 6.

[0037] The measuring assembly 5 includes a measuring plate 1 7 and a measuring plate 2 8. Both the measuring plate 1 7 and the measuring plate 2 8 include a connecting portion 12 and two telescopic portions 13. The two telescopic portions 13 are respectively installed at both ends of the connecting portion 12 in the length direction, and both can slide on the connecting portion 12 along the length direction of the connecting portion 12. The connecting portion 12 is used to be rotatably connected to the support rod 4, that is, the connecting portion 12 on the measuring plate 1 7 and the connecting portion 12 on the measuring plate 2 8 can both rotate around the axis of the support rod 4. Scale lines 9 are provided on the connecting portion 12 and the two telescopic portions 13. The 0 scale position of the scale line 9 coincides with the axis of the support rod 4, and the scale value on the scale line 9 gradually increases from the 0 scale position toward the direction of the two telescopic portions 13.

[0038] A sleeve 10 is provided at the end of the telescopic part 13 away from the connecting part 12, and the axis of the sleeve 10 is perpendicular to the length direction of the telescopic part 13. A scale 11 is also provided on the outside of each sleeve 10. The scale 11 includes a measuring part 14 and a measuring part 2 15. The measuring part 14 is sleeved on the sleeve 10 and can rotate around the axis of the sleeve 10, while the measuring part 2 15 is slidably connected to the measuring part 14 and can measure along the length direction of the measuring part 14. Scale lines 9 are provided on both the measuring part 14 and the measuring part 2 15. The 0 scale position of the scale lines 9 on the measuring part 14 and the measuring part 2 15 coincides with the axis of the sleeve 10, and the scale value gradually increases from the measuring part 14 to the measuring part 2 15.

[0039] Furthermore, in order to improve the accuracy of the distance measurement between the two acoustic detection tubes 25 between the measuring part 14 and the measuring part 2 15, an arc-shaped abutting portion 16 is provided at the end of the measuring part 2 15 away from the measuring part 14. The arc formed by the abutting portion 16 and the outer wall of the acoustic detection tube 25 is a quarter circle that is adapted to the curvature of the acoustic detection tube 25. This allows the abutting portion 16 to abut against the outer wall of the acoustic detection tube 25, and the center distance between the two acoustic detection tubes 25 can be directly calculated by reading the scale value on the measuring part 2 15 and the scale value on the measuring part 14.

[0040] In other embodiments, the scale lines 9 on the second measuring portion 15 may gradually increase from a direction away from the first measuring portion 14 to a direction close to the first measuring portion 14 , and the 0 scale position is flush with the end surface of the abutting portion 16 .

[0041] Reference Figure 1 and Figure 3 The pay-off assembly 6 includes a reel 17, four slides 18, four telescopic arms 19, and pulleys 27 corresponding to the number of telescopic arms 19. The reel 17 is fixedly mounted on the support rod 4 and can rotate around its own axis. The data transmission line 2 is wound on the reel 17. Subsequent staff can simultaneously pull multiple data transmission lines 2 to lift and remove all transducers 1 from the measuring tube. A sliding groove distributed around the axis of the support rod 4 is also provided on the outer wall of the support rod 4. The four slides 18 are respectively located in the sliding grooves, which are C-shaped slide grooves 20 to prevent sliding. Part 18 falls off from the groove, and the four sliding parts 18 can slide in the sliding groove along the extension direction of the sliding groove, and the telescopic arm 19 includes a telescopic arm 1 22 and a telescopic arm 2 23. The telescopic arm 1 22 is mounted on the telescopic arm 2 23, and the telescopic arm 2 23 can slide along the length direction of the telescopic arm 1 22 on the telescopic arm 1 22. At the end of the telescopic arm 2 23 away from the telescopic arm 1 22, there is a threading hole 21 for the data transmission line 2 to pass through, and the pulley 27 is near the threading hole 21 in a ball-hinged manner, which enables the pulley 27 to be adjusted according to the moving direction of the data transmission line 2.

[0042] The telescopic arm 1 22 is hinged to the sliding member 18, and the axis of the hinge shaft is perpendicular to the axis of the support rod 4. This allows the telescopic arm 1 22 and the telescopic arm 2 23 to rotate around the axis of the hinge shaft when not in use, so that the telescopic arm 1 22 and the telescopic arm 2 23 are close to the support rod 4, thereby reducing the space occupied by the telescopic arm 1 22 and the telescopic arm 2 23 when not in use.

[0043] Furthermore, a positioning bolt 24 is provided on the telescopic arm 1 22, and the positioning bolt 24 is connected to the telescopic arm 1 22 by threaded fitting. A positioning groove is also provided at the position of the telescopic arm 23 corresponding to the positioning bolt 24. The extension direction of the positioning groove is consistent with the sliding direction of the telescopic arm 23 on the telescopic arm 1 22, and one end of the positioning bolt 24 passes through the telescopic arm 1 22 and is located in the positioning groove on the telescopic arm 23, which prevents the telescopic arm 23 from easily falling off the telescopic arm 1 22.

[0044] The implementation principle of the embodiment of the present application is as follows: first, the two sleeves 10 on the measuring plate 1 7 are respectively sleeved on the two acoustic detection tubes 25 on the diagonal line, and then the two sleeves 10 on the measuring plate 2 8 are respectively sleeved on the two acoustic detection tubes 25 on the other diagonal line. By reading the values ​​on the connecting portion 12 and the two telescopic portions 13 on the measuring plate 1 7 and the values ​​on the connecting portion 12 and the two telescopic portions 13 on the measuring plate 2 8, the center distance between the two acoustic detection tubes 25 on different diagonals can be obtained respectively; then, the scales 11 sleeved on the sleeves 10 are respectively rotated out so that the abutting portions 16 on the scales 11 can be It can abut against the outer wall of the acoustic detection tube 25, and then read the value on the scale 11 to obtain the center distance between the two acoustic detection tubes 25 on the non-diagonal line. Subsequently, the corresponding data are input into the waveform detector 3, and then the four transducers 1 are placed into the four acoustic detection tubes 25 respectively. By pulling the data transmission money, the transducer 1 is moved at a uniform speed in the acoustic detection tube 25 at the same time. The transducer 1 emits sound waves to detect the integrity of the foundation pile 26, and the corresponding data is transmitted back to the waveform detector 3 through the data line transmission line. The staff analyzes the integrity of the foundation pile 26 through the waveform diagram displayed on the waveform detector 3.

[0045] Example 2:

[0046] Example 2 of the present application provides a method for detecting pile integrity, which uses the pile integrity detection device provided in Example 1, and the steps are as follows:

[0047] S100: placing one end of the support rod 4 provided with the measuring assembly 5 on the foundation pile 26;

[0048] S200: The shaft sleeve 10 on the measuring plate 1 7 and the shaft sleeve 10 on the measuring plate 2 8 are respectively mounted on different acoustic detection tubes 25 on the foundation pile 26;

[0049] S300 : Rotate the scales 11 on the measuring plate 1 7 and the measuring plate 2 8 respectively, so that each scale 11 abuts against an outer wall of a different acoustic detection tube 25 .

[0050] S400: Read the distance between the sleeves 10 at both ends of the measuring plate 1 7 and the axis of the support rod 4, and the distance between the two ends of the measuring plate 2 8 and the axis of the support rod 4; then read the distance when the scale 11 abuts the outer wall of the acoustic detection tube 25 after rotation;

[0051] S500: Input the read values ​​into the waveform detector 3 one by one, and place the transducers 1 one by one into the acoustic detection tube 25 on the foundation pile 26 for detection;

[0052] S600: judging the integrity of the foundation pile 26 according to the waveform diagram transmitted by the transducer 1 to the waveform detector 3 .

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A pile integrity detection device, installed between four rectangularly distributed acoustic detection tubes (25), comprising four transducers (1), data transmission lines (2) respectively connected to the transducers (1), and a waveform detector (3), wherein each of the data transmission lines (2) is connected to the waveform detector (3), and characterized in that: The device further comprises a support rod (4), a measuring assembly (5) and a pay-off assembly (6), wherein the measuring assembly (5) and the pay-off assembly (6) are respectively mounted at both ends of the support rod (4), and the pay-off assembly (6) is used for retracting and releasing the data transmission line (2). The measuring assembly (5) comprises a measuring plate 1 (7) and a measuring plate 2 (8), wherein the measuring plate 1 (7) and the measuring plate 2 (8) are both sleeved on the support rod (4) and can rotate around the axis of the support rod (4), and the measuring plate 1 (7) and the measuring plate 2 (8) are both provided with a scale line (9), and the 0 scale on the scale line (9) coincides with the axis of the support rod (4); both ends of the measuring plate 1 (7) and the measuring plate 2 (8) are provided with a shaft sleeve (10), and each shaft sleeve (10) is sleeved with a scale (11), and the scale (11) can rotate around the axis of the shaft sleeve (10), and the measuring plate 1 (7) and the measuring plate 2 (8) are both provided with a shaft sleeve (10), and each shaft sleeve (10) is sleeved with a scale (11), and the scale (11) can rotate around the axis of the shaft sleeve (10). ) and the end of the scale (11) on the measuring plate 2 (8) away from the sleeve (10) can respectively abut against the outer wall of different acoustic detection tubes (25); the pay-off assembly (6) includes a reel (17), four sliding members (18), four telescopic arms (19) and pulleys (27) corresponding to the number of the telescopic arms (19); a slide groove (20) surrounding the axis of the support rod (4) is provided on the outer wall of the support rod (4); the four sliding members (18) are all located in the slide groove (20) and can slide in the slide groove (20); one end of the telescopic arm (19) is fixedly connected to the sliding member (18); the other end of the telescopic arm (19) is provided with a threading hole (21); the pulley (27) is ball-hinged at one end of the telescopic arm (19) provided with the threading hole (21); the reel (17) is mounted on the support rod (4).

2. A pile integrity detection device according to claim 1, characterized in that: The measuring plate 1 (7) and the measuring plate 2 (8) each include a connecting portion (12) and two telescopic portions (13). The connecting portion (12) is used for rotationally connecting with the support rod (4). The two telescopic portions (13) are located at both ends of the connecting portion (12) and can slide along the length direction of the connecting portion (12). The shaft sleeve (10) is mounted on the telescopic portion (13).

3. The pile integrity detection device according to claim 1, characterized in that: The scale (11) comprises a measuring part 1 (14) and a measuring part 2 (15), wherein the measuring part 1 (14) is connected to the shaft sleeve (10), and the measuring part 2 (15) is used to abut against the outer wall of the acoustic detection tube (25), and the measuring part 2 (15) can slide on the measuring part 1 (14) along the length direction of the measuring part 1 (14).

4. A pile integrity detection device according to claim 3, characterized in that: An arc-shaped abutting portion (16) is provided at one end of the second measuring portion (15) away from the first measuring portion (14). The arc of the abutting portion (16) is a quarter circle, and the abutting portion (16) is adapted to the arc of the outer wall of the acoustic detection tube (25).

5. The pile integrity detection device according to claim 1, characterized in that: The telescopic arm (19) includes a telescopic arm 1 (22) and a telescopic arm 2 (23). The telescopic arm 1 (22) is connected to the sliding member (18). The telescopic arm 1 (22) is sleeved on the telescopic arm 2 (23). The telescopic arm 2 (23) can slide along the length direction of the telescopic arm 1 (22). A positioning bolt (24) is passed through the telescopic arm 1 (22). The positioning bolt (24) is connected to the telescopic arm 1 (22) by threaded engagement and can be tightly pressed against the outer surface of the telescopic arm 2 (23). The threading hole (21) is located at an end of the telescopic arm 2 (23) away from the telescopic arm 1 (22). The pulley (27) is installed on the telescopic arm 2 (23).

6. The pile integrity detection device according to claim 5, characterized in that: The telescopic arm (22) is hinged to the sliding member (18), and the axis direction of the hinge shaft between the telescopic arm (22) and the sliding member (18) is perpendicular to the axis of the support rod (4).

7. A method for detecting pile integrity, using a pile integrity detection device according to any one of claims 1 to 6, characterized in that: The steps include: S100: placing one end of the support rod (4) provided with the measuring assembly (5) on a foundation pile (26); S200: The shaft sleeve (10) on the measuring plate 1 (7) and the shaft sleeve (10) on the measuring plate 2 (8) are respectively sleeved on different acoustic detection tubes (25) on the foundation pile (26); S300: rotating the scales (11) on the first measuring plate (7) and the second measuring plate (8) respectively, so that the scales (11) abut against the outer walls of different acoustic detection tubes (25); S400: Read the distance between the shaft sleeves (10) at both ends of the measuring plate 1 (7) and the axis of the support rod (4), and the distance between the two ends of the measuring plate 2 (8) and the axis of the support rod (4); then read the distance when the scale (11) abuts against the outer wall of the acoustic detection tube (25) after rotation; S500: Input the read values ​​into the waveform detector (3) one by one, and place the transducers (1) into the acoustic detection tubes (25) on the foundation piles (26) one by one for detection; S600: judging the integrity of the foundation pile (26) based on the waveform diagram transmitted by the transducer (1) to the waveform detector (3).

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