A pile nondestructive testing device and method

Abstract

This invention relates to the field of non-destructive testing (NDT) technology for foundation piles, and particularly to an NDT device and method for foundation piles. The device includes a support frame and a control unit. A turntable is mounted on the support frame, and at least two position adjustment mechanisms are circumferentially distributed on the turntable. A composite testing mechanism is mounted on each position adjustment mechanism. The composite testing mechanism includes a terahertz detection component and an ultrasonic detection component, which are respectively installed inside a non-metallic embedded pipe and a sonic logging pipe. The terahertz and ultrasonic detection components are connected to the control unit via communication cables. The turntable is equipped with a cable retraction mechanism. A method based on the above device is also disclosed, enabling full-dimensional defect detection of both the internal and surface layers of the foundation pile, with no blind spots.

Description

Technical Field

[0001] This invention relates to the field of non-destructive testing technology for foundation piles, and in particular to a non-destructive testing device and method for foundation piles. Background Technology

[0002] The core of non-destructive testing of foundation piles is to use three mainstream devices and methods—low-strain reflection wave method, acoustic transmission method, and high-strain method—to detect the integrity of the pile body, the location of defects, and the bearing capacity without damaging the pile body, covering the entire process from general survey to detailed investigation and verification.

[0003] For detailed defect inspection of large-diameter piles using the acoustic transmission method, pre-embedded acoustic logging tubes are required. While this method offers high accuracy at depth, the tubes are embedded inside the pile, close to the inner side of the reinforcing cage. There is generally a certain thickness of concrete protective layer between the pile's outer surface. Ultrasonic waves can only propagate in the cross-section between two logging tubes. The concrete area outside the tubes, near the pile surface, is completely outside the scanning cross-section. This method can only identify inclusions, segregation, and voids in the middle area of ​​the pile, as well as surface micro-cracks, surface honeycombing, surface peeling, shallow looseness, and protective layer cracks—all of which are completely missed by the acoustic waves. Furthermore, detailed defect inspection using the acoustic transmission method requires moving two transducers simultaneously, resulting in poor accuracy due to manual movement. Summary of the Invention

[0004] The purpose of this invention is to provide a non-destructive testing device and method for foundation piles, thereby solving the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention provides a non-destructive testing device for foundation piles, including a support and a control host. A turntable is provided on the support, and at least two position adjustment mechanisms are distributed circumferentially on the turntable. A composite testing mechanism is provided on the position adjustment mechanism. The composite testing mechanism includes a terahertz testing component and an ultrasonic testing component. The terahertz testing component and the ultrasonic testing component are respectively installed in a non-metallic embedded pipe and a sonic logging pipe. The terahertz testing component and the ultrasonic testing component are connected to the control host through a communication cable. A winding and unwinding mechanism for winding and unwinding the communication cable is provided on the turntable. The turntable, position adjustment mechanism, and take-up / retract mechanism are all connected to the main control unit.

[0006] Preferably, a limiting groove is provided on the turntable, and a first positioning groove is provided in the limiting groove. A fixing component is provided on the turntable, and the fixing component includes a damping shaft installed on the turntable, and a fixing plate is rotatably provided on the damping shaft.

[0007] Preferably, the position adjustment mechanism includes a radial adjustment telescopic cylinder, the telescopic end of which is provided with a folding arc-shaped guide rail. The folding arc-shaped guide rail includes a main fixed section and a side folding section. The two side folding sections are respectively connected to the two ends of the main fixed section by cross spring hinges. The folding arc-shaped guide rail has several through holes. A second positioning groove is provided in the folding arc-shaped guide rail on both sides of the through holes. A guide wire is slidably arranged in the folding arc-shaped guide rail. The guide wire has through holes. An elastic positioning element is provided at one end of the guide element. The elastic positioning element is arranged opposite to the second positioning groove. The radially adjustable telescopic cylinder is electrically connected to the control host.

[0008] Preferably, both the terahertz detection component and the ultrasonic detection component are equipped with a positioning component. The positioning component includes a fixed ring fixed to the communication cable, a drive gear ring rotatably connected to the fixed ring, a vortex groove on one side of the drive gear ring, at least three guide grooves on the circumferential side of the fixed ring, a positioning plate slidably disposed in the guide grooves, a meshing tooth on the bottom of the positioning plate, the meshing tooth meshing with the vortex groove, a positioning drive motor fixed to the outside of the fixed ring, a drive gear on the output shaft of the positioning drive motor, the drive gear meshing with the drive gear ring, the positioning drive motor causes the drive gear ring to rotate forward and backward, driving the positioning plate to move back and forth along the guide grooves; The positioning drive motor is electrically connected to the control host.

[0009] Preferably, one end of the positioning plate is provided with an adjustment groove, the mounting bearing of the roller is slidably disposed in the adjustment groove, an adjustment spring is provided in the adjustment groove, a pressure sensor is provided between one end of the adjustment spring and the adjustment groove, and the other end of the adjustment spring is connected to the mounting bearing. When in the descent state, the positioning plate is in the retracted state; When in the upward movement state, the positioning plate is in the extended state and the pressure value is less than the pressure setting value; When in the fixed state, the positioning plate is in the extended state and the pressure value is not less than the pressure setting value, so that the adjusting spring is in a rigid compression state. The pressure sensor is electrically connected to the control host.

[0010] Preferably, the ultrasonic testing component includes at least one set of ultrasonic transducers, each set of ultrasonic transducers including a transmitting ultrasonic transducer and a receiving ultrasonic transducer, and transmits the received ultrasonic signals to the control host for defect analysis.

[0011] Preferably, the terahertz detection assembly includes a terahertz emission source and a terahertz detector. The terahertz emission source and the terahertz detector are fixed on a mounting frame. The mounting frame is rotatably mounted on a fixed ring and is provided with a rotating gear ring. The rotating gear ring meshes with a gear on a rotating drive motor on the fixed ring to realize the rotation of the terahertz emission source and the terahertz detector. The rotary drive motor, terahertz emission source, and terahertz detector are all electrically connected to the control host.

[0012] Preferably, the take-up and release mechanism includes a cable rack and a positioning frame mounted on a turntable. The cable rack is equipped with two take-up and release drive motors with encoders arranged in parallel to drive the two shafts of the cable rack to rotate. The positioning frames are symmetrically arranged on both sides of the cable rack. The positioning frames are equipped with a first pulley, a second pulley, and a wire ring. The positioning frame opposite to the second pulley is equipped with a top fixing assembly. The top fixing assembly includes a mounting arm fixed on the positioning frame. A guide sleeve is provided in the middle of the mounting arm, which is opposite to the rope groove of the second pulley. A top rod is slidably arranged in the guide sleeve. A tightening spring is provided between the top head of the top rod and the end of the guide sleeve. Both the encoder and the take-up / retractor drive motor are electrically connected to the control host.

[0013] The specific steps of the method based on the above-mentioned non-destructive testing device for foundation piles are as follows: Step S1: Pre-embed non-metallic embedded pipes and sonic logging pipes according to the dimensions of the foundation piles; after the foundation pile strength reaches the set value, fill the sonic logging pipes with water, adjust the extension and retraction of the radial adjustment telescopic cylinder according to the dimensions of the foundation piles, and adjust the position of the folding arc guide rails through the turntable so that the through hole is positioned opposite to the non-metallic embedded pipes and sonic logging pipes; after the terahertz detection component and ultrasonic detection component are zeroed, lower the terahertz detection component and ultrasonic detection component into the pre-embedded non-metallic embedded pipes and sonic logging pipes respectively; Step S2: The ultrasonic testing component first performs defect detection. After the axial distance between the terahertz testing component and the ultrasonic testing component reaches the set value, the terahertz testing component then performs defect detection and transmits the received data to the control host for defect analysis.

[0014] Preferably, step S2 is as follows: Step S21: The transmitting and receiving ultrasonic transducers rise synchronously, and the sound time, amplitude, dominant frequency, and waveform are measured point by point; the abnormal segment is identified. Step S22: After the axial distance between the ultrasonic transducer and the terahertz detection component reaches 1m, the terahertz detection component performs peripheral defect detection on the foundation pile. The terahertz emission source and the terahertz detector rotate synchronously in the same axial position for one revolution and then perform scanning detection at different radial positions. The terahertz emission source and the terahertz detector rise a set distance and then rotate for one revolution to scan detection until they rise to the top of the foundation pile. Step S23: The communication cables for the transmitting and receiving ultrasonic transducers are respectively wound around the two axes of the cable frame, and the defect boundary is determined by oblique measurement in the abnormal section.

[0015] Therefore, the present invention employs the above-mentioned non-destructive testing device and method for foundation piles, which has the following beneficial effects: (1) Combining ultrasonic testing with terahertz testing, the ultrasonic testing component accurately identifies core defects such as mud inclusion, segregation, and voids inside the pile, while the terahertz testing component can penetrate the concrete protective layer and effectively detect peripheral defects such as microcracks, honeycomb, spalling, and shallow looseness on the surface of the pile that cannot be covered by traditional sound waves, thus achieving full-dimensional defect detection inside and on the surface of the pile without any blind spots.

[0016] (2) By controlling the turntable, radial adjustment telescopic cylinder and retraction mechanism in linkage with the host, the radial, circumferential and axial positions of the composite detection mechanism can be automatically and accurately adjusted, replacing manual movement and avoiding manual operation errors; the retraction mechanism is equipped with an encoder, which can accurately control the lifting distance and speed of the detection components, making the detection data more stable and the detection efficiency greatly improved.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a non-destructive testing device for foundation piles according to the present invention; Figure 2 This is a schematic diagram of the turntable structure of the present invention; Figure 3 This is a schematic diagram of the position adjustment mechanism of the present invention; Figure 4 This is a schematic diagram of the side folding section structure of the present invention; Figure 5 This is a schematic diagram of the conductor structure of the present invention; Figure 6 This is a schematic diagram of the ultrasonic testing component structure of the present invention; Figure 7 This is a schematic diagram of the terahertz detection component structure of the present invention; Figure 8 This is a schematic diagram of the retraction and extension mechanism of the present invention; Figure 9 This is a schematic diagram of the top-fixing component structure of the present invention.

[0019] Figure Labels 1. Bracket; 2. Turntable; 21. Limiting groove; 22. First positioning groove; 23. Fixing assembly; 231. Damping shaft; 232. Fixing plate; 3. Position adjustment mechanism; 31. Radial adjustment telescopic cylinder; 32. Folding arc-shaped guide rail; 321. Main fixing section; 322. Side folding section; 323. Through hole for wire; 324. Second positioning groove; 33. Wire guide; 331. Wire through hole; 332. Elastic positioning component; 4. Composite detection mechanism; 41. Terahertz detection assembly; 411. Terahertz emission source; 412. Terahertz detector; 413. Mounting bracket; 414. Rotary gear ring; 415. Rotary drive motor; 42. Ultra 43. Sound detection component; 43. Positioning component; 431. Fixing ring; 4311. Guide groove; 432. Drive gear ring; 4321. Vortex groove; 433. Positioning plate; 4331. Adjustment groove; 4332. Roller; 4333. Mounting bearing; 4334. Adjusting spring; 434. Positioning drive motor; 435. Drive gear; 5. Communication cable; 6. Retraction and extension mechanism; 61. Cable rack; 62. Positioning frame; 621. First pulley; 622. Second pulley; 623. Wire ring; 63. Retraction and extension drive motor; 64. Top fixing component; 641. Mounting arm; 642. Guide sleeve; 643. Top rod; 644. Top clamping spring. Detailed Implementation

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the 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 limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] like Figure 1 As shown, a non-destructive testing device for foundation piles includes a support 1 and a control host. A turntable 2 is provided on the support 1, and at least two position adjustment mechanisms 3 are distributed circumferentially on the turntable 2. A composite testing mechanism 4 is provided on the position adjustment mechanism 3. The position adjustment mechanism 3 is used to adjust the radial and circumferential positions of the composite testing mechanism 4.

[0023] The position adjustment mechanism 3 includes a radial adjustment telescopic cylinder 31, such as... Figure 2 As shown, a limiting groove 21 is provided on the turntable 2 for placing the radial adjustment telescopic cylinder 31. A first positioning groove 22 is provided in the limiting groove 21. The first positioning groove 22 is arranged opposite to the protrusion at the bottom of the radial adjustment telescopic cylinder 31, so that the position of the radial adjustment telescopic cylinder 31 is fixed. A fixing component 23 is provided on the turntable 2. The fixing component 23 includes a damping shaft 231 mounted on the turntable 2. A fixing plate 232 is rotatably mounted on the damping shaft 231. After the radial adjustment telescopic cylinder 31 is placed in the limiting groove 21, the fixing plate 232 is rotated so that the fixing plate 232 blocks the radial adjustment telescopic cylinder 31. Figure 3 As shown, the telescopic end of the radial adjustment telescopic cylinder 31 is equipped with a folding arc-shaped guide rail 32, which can be folded when not in use to reduce the space occupied. The folding arc-shaped guide rail 32 includes a main fixed section 321 and a side folding section 322, as shown. Figure 4 As shown, the two side folding sections 322 are connected to both ends of the main fixed section 321 via cross spring hinges. The folding arc-shaped guide rail 32 has several through holes 323 for the passage of communication cables 5. Second positioning grooves 324 are provided inside the folding arc-shaped guide rail 32 on both sides of the through holes 323. A wire guide 33 is slidably arranged inside the folding arc-shaped guide rail 32. Figure 5 As shown, the guide has a wire through hole 331, and an elastic positioning element 332 (a ball-head plunger is used in this embodiment) is provided at one end of the guide. The elastic positioning element 332 is arranged opposite to the second positioning groove 324 to prevent the guide from sliding arbitrarily on the folded arc guide rail 32. The radial adjustment telescopic cylinder 31 is electrically connected to the control host and is used to adjust the radial position of the folded arc guide rail 32. By adjusting the position of the guide on the folded arc guide rail 32, the circumferential position can be adjusted.

[0024] The composite testing mechanism 4 includes a terahertz testing component 41 and an ultrasonic testing component 42. The terahertz testing component 41 and the ultrasonic testing component 42 are respectively installed in the non-metallic embedded pipe and the acoustic tube. The terahertz testing component 41 and the ultrasonic testing component 42 are connected to the control host through the communication cable 5.

[0025] like Figure 6As shown, the ultrasonic testing component 42 includes at least one set of ultrasonic transducers. Each set of ultrasonic transducers includes a transmitting ultrasonic transducer and a receiving ultrasonic transducer, which transmits the received ultrasonic signals to the control host for defect analysis. Both the terahertz detection component 41 and the ultrasonic detection component 42 are equipped with a positioning component 43. The positioning component 43 includes a fixed ring 431 fixed to the communication cable 5. The fixed ring 431 is rotatably connected to a drive gear ring 432. A vortex groove 4321 is opened on one side of the drive gear ring 432. At least three guide grooves 4311 are opened on the circumferential side of the fixed ring 431. A positioning plate 433 is slidably arranged in the guide grooves 4311. The bottom of the positioning plate 433 is provided with meshing teeth that mesh with the vortex grooves 4321. A positioning drive motor 434 is fixed to the outside of the fixed ring 431. A drive gear 435 is provided on the output shaft of the positioning drive motor 434. The drive gear 435 meshes with the drive gear ring 432. The positioning drive motor 434 causes the drive gear ring 432 to rotate in both directions, driving the positioning plate 433 to move back and forth along the guide grooves 4311. The positioning drive motor 434 is electrically connected to the control host. The positioning plate 433 has an adjustment groove 4331 at one end. The mounting bearing 4333 of the roller 4332 is slidably disposed within the adjustment groove 4331. An adjustment spring 4334 is disposed within the adjustment groove 4331. A pressure sensor is disposed between one end of the adjustment spring 4334 and the adjustment groove 4331, and the other end of the adjustment spring 4334 is connected to the mounting bearing 4333. In the descending state, the positioning plate 433 is in a retracted state. In the ascending moving state, the positioning plate 433 is in an extended state and the pressure value is less than the pressure set value. In the fixed state, the positioning plate 433 is in an extended state and the pressure value is not less than the pressure set value, so that the adjustment spring 4334 is in a rigidly compressed state. The pressure sensor is electrically connected to the control host and is used to collect real-time pressure data.

[0026] like Figure 7 As shown, the terahertz detection assembly 41 includes a terahertz emission source 411 and a terahertz detector 412. The terahertz emission source 411 and the terahertz detector 412 are fixed on the mounting bracket 413. The mounting bracket 413 is rotatably mounted on the fixed ring 431 and is provided with a rotating gear ring 414. The rotating gear ring 414 meshes with the gear on the rotating drive motor 415 on the fixed ring 431 to realize the rotation of the terahertz emission source 411 and the terahertz detector 412. The rotating drive motor 415, the terahertz emission source 411 and the terahertz detector 412 are all electrically connected to the control host.

[0027] The turntable 2 is equipped with a winding mechanism 6 for winding and unwinding the communication cable 5. Both the turntable 2 and the winding mechanism 6 are electrically connected to the control host. Figure 8As shown, the take-up and release mechanism 6 includes a cable rack 61 and a positioning frame 62 mounted on the turntable 2. The cable rack 61 is equipped with two parallel take-up and release drive motors 63 with encoders, used to drive the two shafts of the cable rack 61 to rotate. The positioning frame 62 is symmetrically arranged on both sides of the cable rack 61. The positioning frame 62 is equipped with a first pulley 621, a second pulley 622, and a wire ring 623. The positioning frame 62 opposite to the second pulley 622 is equipped with a top fixing assembly 64, such as... Figure 9 As shown, the top-fixing assembly 64 includes a mounting arm 641 fixed on the positioning frame 62. A guide sleeve 642 is provided in the middle of the mounting arm 641, which is opposite to the rope groove of the second pulley 622. A top rod 643 is slidably arranged inside the guide sleeve 642. A tightening spring 644 is provided between the top of the top rod 643 and the end of the guide sleeve 642. The encoder and the retraction drive motor 63 are both electrically connected to the control host.

[0028] The specific steps of the method based on the above-mentioned non-destructive testing device for foundation piles are as follows: Step S1: Pre-embed non-metallic embedded pipes and sonic logging pipes according to the size of the foundation pile; after the foundation pile strength reaches the set value (concrete strength ≥ 70% of design strength and ≥ 15MPa), fill the sonic logging pipe with water, adjust the extension amount of the radial adjustment telescopic cylinder 31 according to the size of the foundation pile, and adjust the position of the folded arc guide rail 32 through the turntable 2 so that the through hole 323 is set opposite to the non-metallic embedded pipe and sonic logging pipe; after the terahertz detection component 41 and ultrasonic detection component 42 are zeroed, lower the terahertz detection component 41 and ultrasonic detection component 42 into the pre-embedded non-metallic embedded pipe and sonic logging pipe respectively.

[0029] Step S2: The ultrasonic testing component 42 first performs defect detection. After the axial distance between the terahertz testing component 41 and the ultrasonic testing component 42 reaches the set value, the terahertz testing component 41 then performs defect detection and transmits the received data to the control host for defect analysis.

[0030] Step S21: The transmitting and receiving ultrasonic transducers rise synchronously, and the sound time, amplitude, dominant frequency and waveform are measured point by point, with a sampling interval ≤0.5μs; abnormal segments (excessive sound time, sudden drop in amplitude, waveform distortion, etc.) are identified.

[0031] Step S22: After the axial distance between the ultrasonic transducer and the terahertz detection component 41 reaches 1m, the terahertz detection component 41 performs peripheral defect detection on the foundation pile. The terahertz emission source 411 and the terahertz detector 412 rotate synchronously at the same axial position for one revolution and then perform scanning detection at different radial positions. The terahertz emission source 411 and the terahertz detector 412 rise a set distance and then rotate for one revolution to scan detection until they rise to the top of the foundation pile.

[0032] Step S23: The communication cables 5 of the transmitting and receiving ultrasonic transducers are respectively wound around the two axes of the cable frame 61. The defect boundary is determined by oblique measurement in the abnormal section. The transmitting and receiving ultrasonic transducers are connected with a fixed height difference and the horizontal angle between the lines is ≤30° to determine the defect boundary.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A non-destructive testing device for foundation piles, comprising a support frame and a control host, characterized in that: The support is equipped with a turntable, on which at least two position adjustment mechanisms are distributed around the circumference. The position adjustment mechanisms are equipped with a composite detection mechanism, which includes a terahertz detection component and an ultrasonic detection component. The terahertz detection component and the ultrasonic detection component are respectively installed in a non-metallic embedded pipe and a sonic logging pipe. The terahertz detection component and the ultrasonic detection component are connected to the control host through a communication cable. The turntable is equipped with a winding and unwinding mechanism for winding and unwinding the communication cable. The turntable, position adjustment mechanism, and take-up / retract mechanism are all connected to the main control unit.

2. The non-destructive testing device for foundation piles according to claim 1, characterized in that: A limit groove is provided on the turntable, and a first positioning groove is provided in the limit groove. A fixing component is provided on the turntable, including a damping shaft installed on the turntable, and a fixing plate is rotatably mounted on the damping shaft.

3. The non-destructive testing device for foundation piles according to claim 2, characterized in that: The position adjustment mechanism includes a radial adjustment telescopic cylinder. The telescopic end of the radial adjustment telescopic cylinder is provided with a folding arc-shaped guide rail. The folding arc-shaped guide rail includes a main fixed section and a side folding section. The two side folding sections are connected to the two ends of the main fixed section respectively by cross spring hinges. The folding arc-shaped guide rail has several through holes. The folding arc-shaped guide rail on both sides of the through holes is provided with a second positioning groove. A guide wire is slidably arranged in the folding arc-shaped guide rail. The guide wire has through holes. One end of the guide wire is provided with an elastic positioning element. The elastic positioning element is arranged opposite to the second positioning groove. The radially adjustable telescopic cylinder is electrically connected to the control host.

4. The non-destructive testing device for foundation piles according to claim 3, characterized in that: Both the terahertz detection component and the ultrasonic detection component are equipped with a positioning component. The positioning component includes a fixed ring fixed to the communication cable. The fixed ring is rotatably connected to a drive gear ring. A vortex groove is opened on one side of the drive gear ring. At least three guide grooves are opened on the circumferential side of the fixed ring. A positioning plate is slidably arranged in the guide grooves. The bottom of the positioning plate is provided with meshing teeth that mesh with the vortex grooves. A positioning drive motor is fixed to the outside of the fixed ring. The output shaft of the positioning drive motor is provided with a drive gear that meshes with the drive gear ring. The positioning drive motor causes the drive gear ring to rotate in both directions, driving the positioning plate to move back and forth along the guide grooves. The positioning drive motor is electrically connected to the control host.

5. The non-destructive testing device for foundation piles according to claim 4, characterized in that: One end of the positioning plate has an adjustment groove, the mounting bearing of the roller is slidably set in the adjustment groove, an adjustment spring is set in the adjustment groove, a pressure sensor is set between one end of the adjustment spring and the adjustment groove, and the other end of the adjustment spring is connected to the mounting bearing. When in the descent state, the positioning plate is in the retracted state; When in the upward movement state, the positioning plate is in the extended state and the pressure value is less than the pressure setting value; When in the fixed state, the positioning plate is in the extended state and the pressure value is not less than the pressure setting value, so that the adjusting spring is in a rigid compression state. The pressure sensor is electrically connected to the control host.

6. The non-destructive testing device for foundation piles according to claim 5, characterized in that: The ultrasonic testing assembly includes at least one set of ultrasonic transducers, each set of ultrasonic transducers including a transmitting ultrasonic transducer and a receiving ultrasonic transducer, which transmits the received ultrasonic signals to the control host for defect analysis.

7. The non-destructive testing device for foundation piles according to claim 6, characterized in that: The terahertz detection assembly includes a terahertz emission source and a terahertz detector. The terahertz emission source and the terahertz detector are fixed on a mounting frame. The mounting frame is rotatably mounted on a fixed ring and is equipped with a rotating gear ring. The rotating gear ring meshes with a gear on a rotating drive motor on the fixed ring to realize the rotation of the terahertz emission source and the terahertz detector. The rotary drive motor, terahertz emission source, and terahertz detector are all electrically connected to the control host.

8. The non-destructive testing device for foundation piles according to claim 7, characterized in that: The take-up and take-down mechanism includes a cable rack and a positioning frame mounted on a turntable. The cable rack is equipped with two parallel take-up and take-down drive motors with encoders, which drive the two shafts of the cable rack to rotate. The positioning frames are symmetrically arranged on both sides of the cable rack. The positioning frames are equipped with a first pulley, a second pulley, and a wire ring. The positioning frame opposite to the second pulley is equipped with a top-fixing assembly. The top-fixing assembly includes a mounting arm fixed on the positioning frame. A guide sleeve is provided in the middle of the mounting arm, which is opposite to the rope groove of the second pulley. A push rod is slidably arranged in the guide sleeve. A tightening spring is provided between the top head of the push rod and the end of the guide sleeve. Both the encoder and the take-up / retractor drive motor are electrically connected to the control host.

9. A method based on the non-destructive testing device for foundation piles according to claim 8, characterized in that, The specific steps are as follows: Step S1: Pre-embed non-metallic embedded pipes and sonic logging pipes according to the dimensions of the foundation piles; after the foundation pile strength reaches the set value, fill the sonic logging pipes with water, adjust the extension and retraction of the radial adjustment telescopic cylinder according to the dimensions of the foundation piles, and adjust the position of the folding arc guide rails through the turntable so that the through hole is positioned opposite to the non-metallic embedded pipes and sonic logging pipes; after the terahertz detection component and ultrasonic detection component are zeroed, lower the terahertz detection component and ultrasonic detection component into the pre-embedded non-metallic embedded pipes and sonic logging pipes respectively; Step S2: The ultrasonic testing component first performs defect detection. After the axial distance between the terahertz testing component and the ultrasonic testing component reaches the set value, the terahertz testing component then performs defect detection and transmits the received data to the control host for defect analysis.

10. The method based on a non-destructive testing device for foundation piles according to claim 9, characterized in that, Step S2 is as follows: Step S21: The transmitting and receiving ultrasonic transducers rise synchronously, and the sound time, amplitude, dominant frequency, and waveform are measured point by point; the abnormal segment is identified. Step S22: After the axial distance between the ultrasonic transducer and the terahertz detection component reaches 1m, the terahertz detection component performs peripheral defect detection on the foundation pile. The terahertz emission source and the terahertz detector rotate synchronously in the same axial position for one revolution and then perform scanning detection at different radial positions. The terahertz emission source and the terahertz detector rise a set distance and then rotate for one revolution to scan detection until they rise to the top of the foundation pile. Step S23: The communication cables for the transmitting and receiving ultrasonic transducers are respectively wound around the two axes of the cable frame, and the defect boundary is determined by oblique measurement in the abnormal section.

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