A method and device for detecting a single-hole seismic wave imaging of a foundation pile

Abstract

The application relates to a pile single-hole seismic wave imaging detection method and device, and relates to the field of engineering measurement, which comprises the following steps: S1, after a detection sensor is lowered, a coupling fluid is filled in an acoustic pipe; S2, vertical excitation is applied on a pile top, so that a seismic wave signal is excited in pile concrete; S3, a detection sensor receives a Stoneley wave signal generated by the coupling effect of the seismic wave on the interface of a pile defect and the fluid in the acoustic pipe; S4, a depth-time wave train is generated according to the Stoneley wave signal; and S5, an eight-character feature in the wave train is identified to judge and position the pile defect. The application has the effect of improving detection efficiency.

Description

Technical Field

[0001] This application relates to the field of engineering surveying technology, and in particular to a method and apparatus for single-hole seismic wave imaging detection of foundation piles. Background Technology

[0002] The quality of foundation piles is a prerequisite for ensuring the quality and safety of the project. Therefore, it is crucial to test the foundation piles after construction is completed. Among the indicators for testing foundation piles, pile integrity is a key factor in determining their quality.

[0003] Currently, the integrity testing of bored cast-in-place piles commonly uses acoustic wave transmission and side-hole transmission methods. Acoustic wave transmission typically involves embedding two or more acoustic logging tubes within the pile body. A transmitting transducer in one tube emits a signal, while a receiving transducer in the other tube receives the signal after it penetrates the pile concrete. The pile quality is assessed by analyzing changes in acoustic parameters. Side-hole transmission involves drilling a hole on one side of the pile body and embedding a casing, injecting water as a coupling agent. A vibratory hammer is then used to strike the top of the pile, and a detector inside the borehole receives the signal. As the detector is gradually raised from the bottom of the hole to the top, striking and signal recording are performed at each depth point.

[0004] However, the acoustic transmission method requires the pre-embedding of multiple acoustic logging tubes during pile construction. If one tube becomes blocked, the transducer cannot be lowered to the detection depth, thus preventing effective detection. It is necessary to ensure that all acoustic logging tubes are unobstructed. The side-hole transmission method requires additional drilling in the soil, which affects the detection efficiency. Summary of the Invention

[0005] To improve the detection efficiency of pile integrity testing, this application provides a single-hole seismic wave imaging detection method and device for piles.

[0006] Firstly, this application provides a single-hole seismic wave imaging detection method for foundation piles, which adopts the following technical solution:

[0007] A single-hole seismic wave imaging detection method for foundation piles includes the following steps: S1. After lowering the detection sensor, fill the acoustic tube with coupling fluid; S2. Apply vertical excitation to the top of the pile to generate seismic wave signals in the pile concrete; S3. The detection sensor receives the Stoneley wave signal generated by the coupling effect between the seismic wave at the pile defect interface and the fluid inside the acoustic tube; S4. Generate a depth-time wave train map based on the Stoneley wave signal; S5. Identify the "figure-eight" feature in the wave pattern to determine and locate the pile body defects.

[0008] By adopting the above technical solution, Stoneley waves are generated at the pile defect by vibration at the pile top. After the detection sensor receives the Stoneley wave signal, a "figure-eight" feature is generated in the depth-time wave train. By interpreting the "figure-eight" feature, the location of the pile defect can be determined.

[0009] The detection method of this application only requires one unobstructed sonic logging tube, which reduces the detection steps required by the sonic transmission method, which requires setting up multiple sonic logging tubes and ensuring that they are all unobstructed. At the same time, it also avoids the construction steps required by the side-hole transmission method, which requires additional drilling, thus improving the detection efficiency.

[0010] Optionally, in step S1, the detection sensor is an array of multiple hydrophones connected in series, with the hydrophones located at different depths in the acoustic tube to synchronously receive the Stoneley wave signal at different depths.

[0011] By adopting the above technical solution, multiple hydrophones are connected in series to form an array for synchronous data acquisition, which can acquire signals from multiple measuring points within the depth range of the pile body at one time, improving the efficiency of on-site detection and enhancing the synchronization and consistency of signals at different depths in time.

[0012] Optionally, in step S3, the detection sensor repeats the excitation and signal acquisition every time it is raised by a certain distance.

[0013] By adopting the above technical solution, using segmented lifting of the detection sensor and repeated vibration acquisition, a complete longwavelength pattern of the entire pile can be formed, improving the comprehensiveness and reliability of the detection.

[0014] Secondly, the single-hole seismic wave imaging detection device for foundation piles provided in this application adopts the following technical solution: A single-hole seismic wave imaging detection device for foundation piles includes a base and a stabilization component; the stabilization component is disposed on the base, and the detection sensor is connected to the base; the stabilization component is used to fix the position of the base and the acoustic tube to limit the movement of the detection sensor.

[0015] By adopting the above technical solution, after the detection sensor is lowered to the detection position, the stabilizing component keeps the base and the acoustic tube relatively fixed, which makes it easier for the staff to tighten the cable, improves the stability of the detection sensor position, reduces the possibility of signal distortion caused by the detection sensor swinging with the water flow or sticking to the wall, and improves the accuracy of detection.

[0016] Optionally, the stabilizing component includes a support mechanism; the support mechanism includes a support drive and a support block, the support drive is disposed on the base, and the support block is disposed on the support drive; the support drive drives the support block to abut against the acoustic tube, so that the positions of the base and the acoustic tube are relatively fixed.

[0017] By adopting the above technical solution, the support drive component drives the support block to press against the pipe wall, thereby fixing the position of the base inside the acoustic tube.

[0018] Optionally, the stabilizing component further includes a roller, which is rotatably connected to the base and abuts against the inner wall of the acoustic tube.

[0019] By adopting the above technical solution, the rollers can guide the base to move inside the acoustic tube, improving the smoothness of the detection device's movement inside the acoustic tube.

[0020] Optionally, it also includes a dredging component, which includes a connecting seat, a rotary drive, a drilling component, a moving drive, and a sliding seat; The moving drive component is disposed on the base, the sliding seat is disposed on the moving drive component, and the rotating drive component is disposed on the sliding seat; The connecting seat is mounted on the rotary drive component and is rotatably connected to the sliding seat. The drilling component is mounted on the connecting seat. The moving drive component drives the sliding seat to move along the axial direction of the sonic logging pipe, and the rotary drive component drives the drilling component to rotate, thereby clearing the sonic logging pipe. Simultaneously, the clearing component and the detection sensor enter the sonic logging pipe together, improving upon the prior art which requires an additional clearing device to clear the sonic logging pipe, thus increasing detection efficiency.

[0021] By adopting the above technical solution, the moving drive can drive the drilling component to move vertically, and the rotating drive can drive the drilling component to rotate, so that the drilling component can move to the blockage position inside the sonic logging pipe and clear the blockage.

[0022] Optionally, the drilling component includes a drill rod, a drill bit, and a grinding disc; the drill rod is disposed on the connecting seat, the drill bit is slidably disposed relative to the drill rod, and the grinding disc is disposed on the drill rod.

[0023] By adopting the above technical solution, the rotation of the drill rod and drill bit can impact and puncture the blockage, and the grinding disc can clear the blockage on the side wall of the sonic logging pipe. This combination improves the ability to break up the blockage and improves the efficiency and reliability of clearing.

[0024] Optionally, the unblocking assembly further includes a support mechanism, which includes a support drive, a connecting rod, and an airbag; the support drive is disposed within the connecting seat, the connecting rod is located within the drill rod, the connecting rod is slidably disposed with the drill rod, one end of the connecting rod is connected to the output end of the support drive, and the other end is connected to the drill bit; the airbag is disposed on the connecting rod and communicates with the connecting rod; The supporting drive component drives the connecting rod to move, causing the airbag to inflate after passing through the blockage, thereby supporting the blockage.

[0025] By adopting the above technical solution, after the drill bit penetrates the blockage, the airbag can deploy to catch the broken blockage, making it easier for staff to remove the blockage from the sonic logging tube. This reduces the possibility of the broken blockage falling to the bottom of the tube and causing secondary blockage, and improves the detection accuracy.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By using pile top vibration to generate Stoneley waves at pile defects, and detecting the signal from the Stoneley waves, a "figure-eight" feature is generated on the depth-time waveform. The location of the pile defect is then determined by interpreting this "figure-eight" feature. This detection method requires only one unobstructed sonic logging tube, reducing the need for multiple unobstructed logging tubes as required by the sonic logging method. It also avoids the additional drilling required by the side-hole logging method, thus improving detection efficiency.

[0028] 2. By using multiple hydrophones connected in series to form an array for synchronous data acquisition, signals from multiple measuring points within the depth range of the pile can be acquired at one time, improving on-site detection efficiency and enhancing the synchronization and consistency of signals at different depths in time;

[0029] 3. By setting up a detection device, after the detection sensor is lowered to the detection position, the stabilizing component keeps the base and the acoustic tube relatively fixed, which makes it easier for the staff to tighten the cable, improves the stability of the detection sensor position, reduces the possibility of signal distortion caused by the detection sensor swinging with the water flow or sticking to the wall, and improves the accuracy of detection. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a single-hole seismic wave imaging detection device for foundation piles according to Embodiment 2 of this application;

[0031] Figure 2 This is a schematic diagram of the structure of a stable component of a single-hole seismic wave imaging detection device for foundation piles, according to Embodiment 2 of this application.

[0032] Figure 3This is an exploded view of the overall structure of a single-hole seismic wave imaging detection device for foundation piles according to Embodiment 2 of this application;

[0033] Figure 4 This is a cross-sectional view of the overall structure of a single-hole seismic wave imaging detection device for foundation piles according to Embodiment 2 of this application;

[0034] Figure 5 This is Embodiment 2 of the present application, which describes a single-hole seismic wave imaging detection device for foundation piles. Figure 4 Enlarged view of a portion of point A inside;

[0035] Figure 6 This is Embodiment 2 of the present application, which describes a single-hole seismic wave imaging detection device for foundation piles. Figure 4 Enlarged view of part B inside;

[0036] Figure 7 This is a schematic diagram of the inflation and expansion of the airbag in a single-hole seismic wave imaging detection device for foundation piles, according to Embodiment 2 of this application.

[0037] Figure 8 This is a schematic diagram of the insertion slot of a single-hole seismic wave imaging detection device for foundation piles according to Embodiment 2 of this application.

[0038] In the diagram: 1. Base; 2. Stabilizing component; 21. Support mechanism; 211. Support drive component; 212. Support block; 22. Roller; 3. Unblocking component; 31. Connecting seat; 311. Air hole; 32. Rotation drive component; 33. Drilling component; 331. Drill rod; 3311. Insertion slot; 332. Drill bit; 3321. Insertion block; 333. Grinding disc; 34. Moving drive component; 35. Sliding seat; 351. First connecting block; 352. Second connecting block; 36. Supporting mechanism; 361. Support drive component; 362. Connecting rod; 363. Airbag; 4. First detection component; 5. Second detection component; 6. Detection sensor; 7. Cable; 8. Acoustic logging tube. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0040] Example 1

[0041] Embodiment 1 of this application discloses a single-hole seismic wave imaging detection method for foundation piles, including the following steps: S1. Lower the detection sensor and fill the acoustic tube with coupling fluid; S2. Apply vertical excitation to the top of the pile to generate seismic wave signals in the pile concrete; S3. The detection sensor receives the Stoneley wave signal generated by the coupling effect between the seismic wave at the interface of the pile defect and the fluid in the acoustic tube. S4. Generate a depth-time wave train based on the Stoneley wave signal; S5. Identify the "figure-eight" feature in the wave pattern to determine and locate pile defects.

[0042] Specifically, firstly, the detection sensor is placed in the tube and brought to a designated depth. In this embodiment 1, the detection sensor consists of multiple hydrophones connected in series. By using multiple hydrophones connected in series to form an array for synchronous data acquisition, signals from multiple measuring points within the pile depth range can be acquired simultaneously, improving on-site detection efficiency and enhancing the temporal synchronization and consistency of signals at different depths. The cables connecting the hydrophones in series are marked with dimensions to facilitate observation of the hydrophone's lowering depth. After the hydrophone is lowered, the acoustic logging tube is filled with a coupling fluid, which is clean water.

[0043] After the detection sensor is lowered to the designated depth, the inspectors use a hammer to strike the top of the pile, with the strike point located at the center of the pile's cross-section. At this point, the processing equipment, electrically connected to the hydrophone, displays a depth-time waveform. Furthermore, during the inspection process, the detection sensor is raised a preset distance, and the hammer strikes the pile top repeatedly, collecting signals to form a complete full-pile-length waveform, thus improving the comprehensiveness and reliability of the inspection.

[0044] It should be noted that after the pile top is struck, the seismic wave signal excited by the pile concrete propagates along the pile. When the seismic wave passes through the defect location in the pile, a new source (Stoneley wave) is generated at the defect interface due to the coupling effect between the fluid inside the sonic logging tube and the concrete interface. The Stoneley wave propagates upward and downward and is received by hydrophones at different locations, forming a "figure-eight" defect feature in the processing equipment, with the intersection point corresponding to the defect location. Similarly, when the seismic wave excited at the pile top reaches the pile bottom, due to the large difference in properties between the concrete and soil interface at the pile bottom, the longitudinal wave couples with the fluid inside the sonic logging tube at this point, exciting a Stoneley wave that is reflected upward and received by the hydrophone, thus allowing the pile length to be detected. Compared to the side-hole transmission method, which uses the propagation of longitudinal waves in concrete to detect pile length, this application utilizes the characteristic that the longitudinal wave at the solid-liquid coupling interface inside the sonic logging tube at the defect location or pile bottom is converted into a Stoneley wave. The Stoneley wave's slow attenuation with distance improves the problem that the longitudinal wave cannot propagate downward due to energy absorption at the defect location, thus preventing the effective measurement of the pile length.

[0045] Example 2

[0046] Embodiment 2 of this application discloses a single-hole seismic wave imaging detection device for foundation piles. This detection device is applied to the detection method of Embodiment 1, in which the detection sensor 6 is lowered to the detection position.

[0047] Specifically, such as Figure 1 and Figure 2As shown, the detection device includes a base 1, a stabilizing component 2, a clearing component 3, and a first detection element 4. The stabilizing component 2 includes a support mechanism 21 and rollers 22; the clearing component 3 includes a connecting seat 31, a rotating drive component 32, a drilling component 33, a moving drive component 34, a sliding seat 35, and a supporting mechanism 36.

[0048] like Figure 2 and Figure 3 As shown, the support mechanism 21 includes a support drive component 211 and a support block 212. A roller 22 is rotatably connected to the base 1. The body of the support drive component 211 is fixedly connected to the base 1, and the output end of the support drive component 211 is fixedly connected to the support block 212. The support drive component 211 is a pneumatic push rod. When the detection device enters the acoustic tube 8, the roller 22 abuts against the inner wall of the acoustic tube 8, guiding the movement of the device and improving the smoothness of its movement within the tube. When the detection sensor 6 moves to the detection position, the support drive component 211 drives the support block 212 to press against the acoustic tube 8, thereby restricting the movement of the device and fixing the base 1 relative to the acoustic tube 8. As shown... Figure 1 As shown, a lifting ring is fixedly connected to the top of the base 1, and the cable 7 is fixedly connected to the base 1 through the lifting ring. The detection sensor 6 in Embodiment 1 of this application is installed on the cable 7, and the operator controls the lowering distance of the detection device through the cable 7.

[0049] After the base 1 is fixed relative to the acoustic tube 8, the operator pulls the cable 7 upward and keeps it taut. At this time, since the base 1 is anchored in the acoustic tube 8 by the support mechanism 21, the taut cable 7 keeps the detection sensor 6 in a vertical position and positioned in the center of the acoustic tube 8, reducing the possibility of signal distortion caused by the detection sensor 6 swinging with the water flow or sticking to the wall, and improving the accuracy of detection.

[0050] like Figure 2 and Figure 3 As shown, the body of the movable drive unit 34 is fixedly connected to the base 1, and the output end of the movable drive unit 34 is fixedly connected to the sliding seat 35. In this embodiment 2, the movable drive unit 34 is a linear module, which can drive the sliding seat 35 to move in the axial direction of the acoustic tube 8. The sliding seat 35 includes a first connecting block 351 and a second connecting block 352, which are fixedly connected. The first connecting block 351 is fixedly connected to the output end of the movable drive unit 34.

[0051] like Figure 3 and Figure 4As shown, the body of the rotary drive 32 is fixedly connected to the first connecting block 351, the connecting seat 31 is rotatably connected to the second connecting block 352, and the output end of the rotary drive 32 is fixedly connected to the connecting seat 31. The rotary drive 32 can drive the connecting seat 31 to rotate on the second connecting block 352. Preferably, the rotary drive 32 is a motor. The moving drive 34 can drive the rotary drive 32 and the connecting seat 31 to move synchronously along the axial direction of the acoustic tube 8 through the sliding seat 35.

[0052] like Figure 4 and Figure 5 As shown, the drilling actuator 33 includes a drill rod 331, a drill bit 332, and a grinding disc 333. One end of the drill rod 331 is fixedly connected to the connecting seat 31, and the grinding disc 333 is fixedly connected to the drill rod 331. The support mechanism 36 includes a support drive 361, a connecting rod 362, and an airbag 363. The body of the support drive 361 is fixedly installed inside the connecting seat 31, and the output end of the support drive 361 is fixedly connected to the connecting rod 362. The connecting rod 362 is fixedly connected to the drill bit 332 and is located inside the drill rod 331. The support drive 361 can drive the connecting rod 362 to slide within the drill rod 331. The support drive 361 is an electric push rod.

[0053] like Figure 5 and Figure 6 As shown, the connecting rod 362 is hollow inside, and the air bladder 363 is connected to the connecting rod 362, so that when the connecting rod 362 is ventilated, the air bladder 363 can be inflated. The upper part of the connecting rod 362 is connected to the inner side of the connecting seat 31, and the connecting seat 31 has an air hole 311 that is connected to the second connecting block 352. The second connecting block 352 is hollow inside and connected to an air pipe, which is connected to an external air source, thus allowing air to pass through and be vented from the connecting rod 362. In this embodiment 2, the air bladder 363 is made of a wear-resistant and puncture-resistant material, and its exterior includes a soft steel wire mesh. When the air bladder 363 is inflated, its outer wall is in contact with the inner wall of the sonic logging tube 8. Furthermore, when the air bladder 363 is deflated, it can be retracted into the drill rod 331 along with the connecting rod 362.

[0054] like Figure 3 and Figure 4As shown, the first detection element 4 is fixedly connected to the connecting base 31. The first detection element 4 can detect the distance between the blockage and the device. Preferably, the first detection element 4 is a laser rangefinder. The first detection element 4 is electrically connected to the support drive element 211, the moving drive element 34, the rotating drive element 32, and the second detection element 5. When the first detection element 4 detects that the distance between the device and the blockage has reached a specified distance, it controls the support drive element 211 to work, so that the support block 212 presses against the acoustic tube 8, thereby fixing the device and reducing the possibility of shaking when the drilling element 33 is working. At the same time, after the position of the base 1 is fixed, the moving drive element 34 and the rotating drive element 32 start to work. The second detection element 5 is fixedly connected between the output end of the supporting drive element 361 and the connecting rod 362. The second detection element 5 can detect the pressure on the connecting rod 362. Preferably, the second detection element 5 is a pressure sensor.

[0055] It should be noted that during the process of lowering the detection sensor 6, the construction personnel use the cable 7 connected to the base 1 to lower the detection device. The cable 7 is equipped with a scale, which can be used to determine the lowering depth of the detection sensor 6.

[0056] In the process of lowering the detection device according to Embodiment 2 of this application, when a blockage in the acoustic tube 8 obstructs the lowering of the detection sensor 6, the first detection element 4 detects that the distance between itself and the blockage has reached the design value. At this point, the support drive element 211 operates, causing the support drive element 211 to drive the support block 212 to press against the inner wall of the acoustic tube 8, thereby fixing the position of the base 1 relative to the acoustic tube 8. Simultaneously, the moving drive element 34 drives the connecting seat 31 to reciprocate along the axial direction of the acoustic tube 8, and the rotating drive element 32 drives the connecting seat 31 to rotate, allowing the drilling element 33 to penetrate the blockage.

[0057] During the operation of the drilling component 33, when the distance between the first detection element 4 and the blockage is within the designed value, and simultaneously, the second detection element 5 detects that the pressure of the drill bit 332 is less than the designed value, it indicates that the drill bit 332 has passed through the blockage, and there is still a blockage fixed on the side wall of the sonic logging tube 8. At this time, the moving drive component 34 stops working, and the supporting drive component 361 drives the connecting rod 362 to move a specified distance away from the drill rod 331, after which the airbag 363 inflates. After the airbag 363 is inflated, the blockage is located between the airbag 363 and the grinding disc 333.

[0058] After the airbag 363 inflates and seals the sonic logging pipe 8, the moving drive component 34 drives the grinding disc 333 to continue moving along the axial direction of the sonic logging pipe 8, thereby clearing the blockage fixed on the side wall. During the vertical movement of the grinding disc 333, the supporting drive component 361 controls the connecting rod 362 to move in the opposite direction to the grinding disc 333, keeping the position of the airbag 363 unchanged. After the drilling component 33 has worked for a specified time, the construction personnel control the support drive component 211 to move the support block 212 away from the sonic logging pipe 8 and pull out the device. Due to the sealing effect of the airbag 363, the blockage material broken up by the grinding disc 333 can fall onto the airbag 363, reducing the possibility of secondary blockage caused by the blockage falling during cleaning.

[0059] Clearing the blockage allows the sensor 6 to be lowered to a deeper position, reducing the possibility of the blockage affecting its placement and causing blind spots. Furthermore, removing the blockage before detection improves the continuity of the fluid within the acoustic tube 8, reducing the likelihood of interference with the detection signal and enhancing accuracy.

[0060] The detection device of Embodiment 2 of this application reduces the possibility that the swing of the detection sensor 6 inside the pipe will affect the detection accuracy during the detection process. At the same time, when encountering blockages, it can directly clear them, which improves the detection steps in the prior art that require the use of additional clearing devices to clear blockages and improves detection efficiency.

[0061] like Figure 7 and Figure 8 As shown, a connector block 3321 is fixedly connected to the drill bit 332, and a connector groove 3311 is provided on the drill rod 331. The connector block 3321 is inserted into the connector groove 3311, which can restrict the relative rotation between the drill bit 332 and the drill rod 331, thereby improving the stability when the drill rod 331 and the drill bit 332 are connected.

[0062] The implementation principle of the single-hole seismic wave imaging detection device for foundation piles in Embodiment 2 of this application is as follows: When testing is required, the construction personnel lower the testing device into the acoustic tube 8 via cable 7 to conduct the testing.

[0063] Once the detection sensor 6 is lowered to the designated depth, the operator controls the support drive component 211 to work, causing the support block 212 to press against the inner wall of the acoustic tube 8, thereby fixing the position of the detection sensor 6 for easy detection.

[0064] When the detection device encounters a blockage while moving inside the acoustic tube 8, the first detection element 4 first detects that the device and the blockage have reached a specified distance, and then controls the support drive element 211 to work, so that the support block 212 presses against the inner wall of the acoustic tube 8, thereby fixing the position of the base 1.

[0065] Then, after the base 1 is fixed, the rotation drive 32 and the moving drive 34 cooperate to allow the drill bit 332 and drill rod 331 to break through the blockage. During the operation of the drilling component 33, when the first detection element 4 detects that the distance from the blockage is within the design value, and simultaneously, when the second detection element 5 detects that the pressure is less than the design value, it indicates that the drill bit 332 has broken through the blockage. At this point, the moving drive 34 stops working. Simultaneously, the support drive 361 drives the connecting rod 362 to move downwards a specified distance. When the drill bit 332 has moved the specified distance and the second detection element 5 detects that the pressure is less than the design value, it indicates that there is no blockage in the path of the drill bit 332. At this point, air is introduced into the connecting rod 362, causing the airbag 363 to inflate and seal the sonic logging tube 8.

[0066] After the airbag 363 is inflated, with the cooperation of the moving drive component 34 and the rotating drive component 32, the drill rod 331 and the grinding disc 333 continue to move vertically to clear the pipe. At the same time, the supporting drive component 361 drives the connecting rod 362 to move synchronously in the opposite direction to the connecting seat 31, so that the airbag 363 remains in a fixed position.

[0067] After the drilling device 33 has been in operation for the designated time, the construction personnel control the support drive component 211 to move the support block 212 away from the inner wall of the sonic logging tube 8, and pull the device out of the sonic logging tube 8, allowing the airbag 363 to carry out the broken blockage. After the detection device pulls out the sonic logging tube 8, the workers clear the blockage and return the airbag 363 back into the drill rod 331, thus facilitating continued detection.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for detecting a pile monopile seismic wave imaging, characterized in that, Includes the following steps: S1. After lowering the detection sensor (6), fill the acoustic tube (8) with coupling fluid; S2. Apply vertical excitation to the top of the pile to generate seismic wave signals in the pile concrete; S3. The detection sensor (6) receives the Stoneley wave signal generated by the coupling effect between the seismic wave at the pile defect interface and the fluid in the acoustic tube (8); S4. Generate a depth-time wave train map based on the Stoneley wave signal; S5. Identify the "figure-eight" feature in the wave pattern to determine and locate the pile body defect.

2. The single-hole seismic wave imaging detection method for foundation piles according to claim 1, characterized in that, In step S1, the detection sensor (6) is an array of multiple hydrophones connected in series. The hydrophones are located at different depths in the acoustic tube (8) to synchronously receive the Stoneley wave signal at different depths.

3. The single-hole seismic wave imaging detection method for foundation piles according to claim 1, characterized in that, In step S3, the detection sensor (6) repeats the excitation and signal acquisition every time it is raised by a certain distance.

4. A single-hole seismic wave imaging detection device for foundation piles, applied in the detection method described in any one of claims 1-3, characterized in that, It includes a base (1) and a stabilizing component (2); the stabilizing component (2) is disposed on the base (1), and the detection sensor (6) is connected to the base (1); the stabilizing component (2) is used to fix the position of the base (1) and the acoustic tube (8) to limit the movement of the detection sensor (6).

5. The single-hole seismic wave imaging detection device for foundation piles according to claim 4, characterized in that, The stabilizing component (2) includes a support mechanism (21); the support mechanism (21) includes a support drive (211) and a support block (212), the support drive (211) is disposed on the base (1), and the support block (212) is disposed on the support drive (211); the support drive (211) drives the support block (212) to abut against the acoustic tube (8), so that the positions of the base (1) and the acoustic tube (8) are relatively fixed.

6. The single-hole seismic wave imaging detection device for foundation piles according to claim 4, characterized in that, The stabilizing component (2) also includes a roller (22), which is rotatably connected to the base (1) and abuts against the inner wall of the acoustic tube (8).

7. The single-hole seismic wave imaging detection device for foundation piles according to claim 4, characterized in that, It also includes a dredging component (3), which includes a connecting seat (31), a rotating drive (32), a drilling component (33), a moving drive (34), and a sliding seat (35); The moving drive (34) is disposed on the base (1), the sliding seat (35) is disposed on the moving drive (34), and the rotating drive (32) is disposed on the sliding seat (35); The connecting seat (31) is disposed on the rotating drive member (32), and the connecting seat (31) is rotatably connected to the sliding seat (35); the drilling member (33) is disposed on the connecting seat (31); the moving drive member (34) drives the sliding seat (35) to move along the axial direction of the sonic logging pipe (8), and the rotating drive member (32) drives the drilling member (33) to rotate, so that the drilling member (33) clears the sonic logging pipe (8).

8. The single-hole seismic wave imaging detection device for foundation piles according to claim 7, characterized in that, The drilling component (33) includes a drill rod (331), a drill bit (332), and a grinding disc (333); the drill rod (331) is disposed on the connecting seat (31), the drill bit (332) is slidably disposed relative to the drill rod (331), and the grinding disc (333) is disposed on the drill rod (331).

9. The single-hole seismic wave imaging detection device for foundation piles according to claim 8, characterized in that, The unblocking component (3) further includes a support mechanism (36), which includes a support drive (361), a connecting rod (362), and an airbag (363). The support drive (361) is disposed in the connecting seat (31), and the connecting rod (362) is located in the drill rod (331). The connecting rod (362) is slidably disposed with the drill rod (331). One end of the connecting rod (362) is connected to the output end of the support drive (361), and the other end is connected to the drill bit (332). The airbag (363) is disposed on the connecting rod (362), and the airbag (363) communicates with the connecting rod (362). The supporting drive member (361) drives the connecting rod (362) to move, so that the airbag (363) inflates after passing through the blockage to support the blockage.

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