A pile foundation core drilling testing auxiliary device

Abstract

This invention relates to an auxiliary device for core drilling testing of pile foundations, comprising an installation plate, an adjustment and limiting mechanism, a support mechanism, and a clamping and fitting mechanism. By adjusting the setting of the limiting mechanism, the invention allows for a sleeve-type limiting of the drill pipe after the installation plate is installed or directly in the desired position. This enables pre-positioning to complete vertical core drilling sampling before core sampling, pre-locating the center position of the pile foundation, and then limiting the drill pipe through the adjusting limiting mechanism. An adjustable two-point positioning method ensures no deviation during core drilling sampling, thus improving the verticality of the core sample. The installation plate and positioning tube work together to limit the drill pipe at the pile foundation positioning point. Then, during drilling, an inner moving cylinder limits the drill pipe, achieving two-point vertical limiting drilling. Combined with the limitation of the drilling hole, this achieves three-point vertical drilling, improving the vertical stability during core sampling.

Description

Technical Field

[0001] This invention belongs to the field of pile foundation testing technology, and specifically relates to an auxiliary device for pile foundation core drilling testing. Background Technology

[0002] Core drilling is a testing method used to inspect the quality of cast-in-place concrete piles. It involves drilling core samples from inside the pile using a drilling rig. This method is primarily used to detect defects and their location, concrete strength, pile length, sediment thickness, and to assess the properties of the soil and rock layers at the pile tip and the integrity of the pile. Core drilling involves using a high-speed drilling rig, along with a water pump, single-action double-tube drill bit, diamond drill pipe, reamer, and other equipment and construction techniques to obtain concrete core samples and soil and rock core samples at the pile tip. Using appropriate testing techniques and devices, it can detect the pile length, strength, sediment thickness at the pile bottom, and pile integrity of the concrete pile foundation. Compared to ultrasonic testing, this method offers higher accuracy.

[0003] Traditional pile foundation testing methods suffer from drawbacks such as inconvenience during core drilling at an angle, requiring manual drilling and pushing, which leads to significant physical exertion over extended periods. To address these issues, we offer an auxiliary support and coordination device for building pile foundation testing.

[0004] To address the aforementioned technical issues, CN214643080U discloses an auxiliary support coordination device for building pile foundation testing. By using a rotating rod, gear one, and gear two, when the crank is turned to drive the positioning gear three to rotate, the rotating rod is simultaneously driven to rotate via a locking strip. The rotating rod drives gear one to rotate, gear one drives gear two to rotate, and gear two drives the track plate to rotate, thereby adjusting the tilt angle of the track plate.

[0005] The aforementioned patent also has the following shortcomings: In the actual core sampling process, the length of the pile foundation is long, which can easily lead to deviation during core sampling. The deeper the drilling depth, the more serious the deviation becomes, which can easily damage the reinforcing cage due to the large inclination during core sampling. It can also affect the sampling results and make it impossible to sample the depth or the bottom of the pile foundation. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an auxiliary device for core drilling detection of pile foundations. The device completes the verticality core drilling sampling operation by using a pre-positioning method before core drilling. The center position of the pile foundation is found in advance, and the drill pipe is limited by the pre-positioning. An adjustable two-point positioning method is used to ensure that the core drilling does not deviate during core drilling, thereby improving the verticality of core drilling.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a pile foundation core drilling detection auxiliary device, including an installation plate, an adjustment and limiting mechanism, a support mechanism and a clamping and fitting mechanism, wherein a positioning hole is provided in the middle of the installation plate and the adjustment and limiting mechanism is located above the installation plate;

[0008] The adjusting and limiting mechanism includes two columns, a top plate, a limiting frame, an outer rotating cylinder, an inner moving cylinder, and a drive assembly. The two columns are located on both sides of the mounting plate and are fixedly connected to the support mechanism at their bottoms. The top plate is connected to the top of each column, and a first through hole is provided in the middle of the top plate. The outer rotating cylinder is engaged with the first through hole and is rotatably connected. The outer rotating cylinder has an internal thread, and the inner moving cylinder has an external thread. The inner moving cylinder is located inside the outer rotating cylinder, and the external and internal threads are compatible. The drive assembly is used to drive the outer rotating cylinder to rotate, thereby causing the inner moving cylinder to rise and fall.

[0009] The limiting frame has a second through hole in the middle, which is fixedly connected to the upper end of the outer circumferential surface of the inner moving cylinder. An anti-sway component is also provided between the limiting frame and the top plate to prevent the limiting frame from swaying horizontally. The clamping adapter mechanism is provided on both sides of the mounting plate to clamp the surface of the area to be measured.

[0010] Furthermore, the adjustment and limiting mechanism also includes a connecting plate located below the top plate. The connecting plate has a third through hole in the middle and is connected to the columns on both sides. The driving assembly includes a driving motor mounted on the connecting plate. The output end of the driving motor is keyed to a gear. The outer rotating cylinder is provided with a gear ring, and the gear and gear ring mesh with each other.

[0011] Furthermore, the anti-sway assembly includes two extension plates and two movable limiting rods. The two extension plates are connected to both sides of the limiting frame. The movable limiting rods are fixedly installed on the lower surface of the extension plates. The top plate has through holes on both sides, through which the movable limiting rods pass.

[0012] Furthermore, the support mechanism includes two horizontal plates, which are fixedly installed on both sides of the mounting plate. A rotating plate is rotatably connected to the outer end of each horizontal plate, and a mounting base is rotatably connected to the bottom end of each rotating plate.

[0013] Furthermore, the clamping adapter mechanism includes two sets of mounting components, two sets of locking components, and two sets of extension components. The two sets of mounting components are disposed on both sides of the mounting plate, and the extension components are disposed inside the mounting components and slidably connected. The ends of the extension components can clamp the sidewalls of the area to be tested, and the locking components are used to limit the displacement generated after the extension components are clamped.

[0014] Furthermore, the mounting assembly includes a connecting tube, which is fixedly mounted on the outer wall of the mounting plate. The connecting tube has a strip-shaped hole that passes through the upper and lower surfaces. The locking assembly is located inside the strip-shaped hole and restricts the extension assembly by abutting against it.

[0015] Furthermore, the extension assembly includes an extension rod located inside the connecting tube and slidably connected, with an arc-shaped adapter plate fixedly installed at the end of the extension rod.

[0016] Furthermore, the locking assembly includes a screw, which is fixedly mounted on the upper surface of the extension rod and extends out of the slotted hole. One end of the screw extending out of the slotted hole is threadedly connected to a threaded sleeve. A slider is fixedly mounted on the bottom of the extension rod, and the slider is located in the slotted hole below the connecting tube and is slidably connected.

[0017] Furthermore, a positioning tube is provided at the positioning hole of the mounting plate.

[0018] Furthermore, a method for core drilling testing of pile foundations is also provided, including the following steps:

[0019] S1. Adjust the clamping adapter mechanism to clamp it on the outer circumference of the pile foundation so that the positioning hole of the mounting plate is aligned with the core drilling area.

[0020] S2. Fixed support mechanism, which limits the horizontal and vertical displacement of the entire adjusting limit mechanism;

[0021] S3. Check the overlap of the inner moving cylinder axis, the positioning hole axis and the pre-drilled hole axis of the pile foundation to be tested. After the check is completed, the drill pipe is sleeved on the inner side wall of the inner moving cylinder and is limited in the horizontal direction. The outer rotating cylinder rotates and drives the inner moving cylinder to move downward. The drill pipe moves downward with the inner moving cylinder until the drill pipe is in contact with the surface of the core drilling area.

[0022] S4. The drill pipe begins core drilling, and the sample to be tested is removed.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This invention, through the adjustment mechanism, allows for a sleeve-type limiting of the drill pipe after the mounting plate is installed or already in the desired position (the drill pipe extends into the inner moving cylinder, and the outer wall of the drill pipe and the inner wall of the inner moving cylinder are in contact to achieve limiting). This allows for pre-positioning before core sampling to complete vertical core sampling, pre-locating the center position of the pile foundation, and then limiting the drill pipe through the inner moving cylinder. An adjustable two-point positioning method ensures no deviation during core sampling and improves the verticality of the core sample. The mounting plate and positioning hole work together to limit the drill pipe at the pile foundation positioning point. Then, during drilling, the outer rotating cylinder and inner moving cylinder further limit the drill pipe, achieving two-point positioning and realizing the advantages of two-point vertical limiting drilling. Furthermore, combined with the limitation of the drilling hole, it can also achieve three-point vertical drilling, thereby improving the vertical stability during core sampling.

[0025] 2. The support mechanism of this invention improves the positioning and limiting of the mounting plate before installation, thereby enhancing stability during installation on the top of the pile foundation. The clamping and adapting mechanism can accommodate piles of different diameters, assisting in positioning the pile core, locking, and drilling, ensuring it is centered and aiding in drilling operations. The rotatable and adjustable rotating plate and mounting base allow the support mechanism to adapt to different diameters and piles at different ground heights, while maintaining a stable connection to the ground. The adapting mechanism uses a push-pull method to adjust the distance between the two sets of adapting plates for fitting, and a threaded locking method for locking after adjustment. Its operation is simple, convenient, and easy to use. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of Embodiment 1 of the present invention after the adjustment and limiting components are hidden;

[0028] Figure 3 This is a three-dimensional structural diagram of the mounting plate and support mechanism in Embodiment 1 of the present invention;

[0029] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the partial structure at point A in the middle;

[0030] Figure 5 This is a three-dimensional structural diagram of the mounting plate and support mechanism in another direction in Embodiment 1 of the present invention;

[0031] Figure 6 This is a vertical three-dimensional structural diagram of the adjusting limit component in Embodiment 1 of the present invention.

[0032] The markings in the diagram are: 1. Mounting plate; 2. Support mechanism; 21. Horizontal plate; 22. Rotating plate; 23. Mounting base; 3. Adaptor mechanism; 31. Connecting pipe; 32. Extension rod; 33. Arc-shaped adapter plate; 34. Strip hole; 35. Screw; 36. Screw sleeve; 37. Slider; 4. Adjustment limit mechanism; 41. Column; 42. Connecting plate; 43. Top plate; 44. Outer rotating cylinder; 45. Gear ring; 46. Drive motor; 47. Gear; 48. Inner moving cylinder; 49. Connecting ring; 410. Extension plate; 411. Moving limit rod; 5. Positioning pipe. Detailed Implementation

[0033] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0034] Example 1

[0035] like Figures 1-6 As shown in the figure, this embodiment provides a pile foundation core drilling detection auxiliary device, including a mounting plate 1, an adjustment and limiting mechanism 4, a support mechanism 2, and a clamping and adapter mechanism 3.

[0036] A positioning hole is provided in the middle of the mounting plate 1, and a positioning tube 5 is provided at the positioning hole of the mounting plate 1. The adjustment limit mechanism 4 is located above the mounting plate 1.

[0037] like Figure 6As shown, the adjusting limit mechanism 4 includes two columns 41, a top plate 43, a connecting plate 42, a limit frame, an outer rotating cylinder 44, an inner moving cylinder 48, and a drive assembly. The two columns 41 are located on both sides of the mounting plate 1 and their bottoms are fixedly connected to the support mechanism 2. The top of the two columns 41 is connected to the top plate 43 by bolts. A first through hole is provided in the middle of the top plate 43. The outer rotating cylinder 44 is locked in the first through hole and rotatably connected. Specifically, a bearing is provided in the first through hole. The circumference of the outer rotating cylinder 44 is fixedly connected to the inner ring of the bearing. A gear ring 45 is provided on the circumference of the outer rotating cylinder 44. The gear ring 45 is located below the first through hole. The inner circumference of the outer rotating cylinder 44 has an internal thread, and the inner moving cylinder 48 has an external thread. The inner moving cylinder 48 is located inside the outer rotating cylinder 44 and the external thread and the internal thread are compatible. The limiting frame has a second through hole in its middle, which is fixedly connected to the upper end of the outer circumferential surface of the inner moving cylinder 48. Preferably, a connecting ring 49 is fixedly provided on the inner circumferential surface of the second through hole, and the connecting ring 49 is fixedly connected to the outer circumferential surface of the inner moving cylinder 48. An anti-sway component is also provided between the limiting frame and the top plate 43 to prevent the limiting frame from swaying horizontally. Specifically, the anti-sway component includes two extension plates 410 and two moving limiting rods 411. The two extension plates 410 are connected to both sides of the limiting frame, and the moving limiting rods 411 are fixedly provided on the lower surface of the extension plates 410. The top plate 43 has through holes on both sides, through which the moving limiting rods 411 pass. During the upward movement of the inner moving cylinder 48, the connecting ring 49 and the extension plates 410 will move together synchronously, and the moving limiting rods 411 will be directly pulled to slide along the axis of the through holes on the top plate 43 to assist in limiting their vertical movement. The connecting plate 42 is located below the top plate 43. The connecting plate 42 has a third through hole in the middle. The two sides of the connecting plate 42 are connected to the column 41. The driving assembly is used to drive the outer rotating cylinder 44 to rotate, thereby driving the inner moving cylinder 48 to rise and fall. Specifically, the driving motor 46 is mounted on the connecting plate 42. The output end of the driving motor 46 is keyed to a gear 47. The outer rotating cylinder 44 is equipped with a gear ring 45. The gear 47 and the gear ring 45 mesh with each other.

[0038] During the drilling process, the inner moving cylinder 48 completes the limit and anti-displacement of the upper drill pipe, and then the positioning pipe 5 cooperates to limit the rotation of the drill pipe at the top of the pile foundation and after drilling. During the drilling process, the drilled hole provides auxiliary limit for the drill pipe. Based on the above three points, the verticality limit and anti-displacement work is achieved to ensure the stability of the drilling process.

[0039] like Figures 4-5As shown, the support mechanism 2 includes two horizontal plates 21, which are fixedly installed on both sides of the mounting plate 1. A rotating plate 22 is rotatably connected to the outer end of the horizontal plate 21, and a mounting base 23 is rotatably connected to the bottom end of the rotating plate 22. The lower surface of the column 41 is in contact with the upper surface of the horizontal plate 21. The rotating plate 22 allows the mounting base 23 to be adjusted according to the height difference of the fixed surface. The rotatable mounting base 23 allows it to adapt to the fixed surface with an inclination, ensuring that the upper limit frame of the adjustment limit mechanism 4, the mounting plate 1, and the surface of the pile foundation to be measured are parallel, thereby ensuring the accuracy of positioning.

[0040] The pre-positioning method is used to complete the limiting operation during drilling. During drilling, the verticality of the upper and lower points is used to limit the drill bit and drill pipe. That is, the pile foundation is positioned by the cooperation of the mounting plate 1 and the positioning hole, thereby limiting the drill pipe. Then, during the drilling process, the outer rotating cylinder 44 and the inner moving cylinder 48 are used to limit the drill pipe. At the same time, the distance between the two limiting points can be adjusted as needed to ensure that it can accommodate drill pipes of different depths. In addition, the limiting effect of the drill pipe during drilling can be increased when the distance is increased.

[0041] Clamping adapter mechanisms 3 are disposed on both sides of the mounting plate 1 and are used to clamp the surface of the area to be measured. The clamping adapter mechanism 3 includes two sets of mounting components, two sets of locking components, and two sets of extension components. The two sets of mounting components are disposed on both sides of the mounting plate 1, and the extension components are disposed inside the mounting components and are slidably connected. The ends of the extension components can clamp the sidewall of the area to be measured. The locking components are used to limit the displacement of the extension components after clamping. Specifically, the mounting components include a connecting pipe 31, which is fixedly installed on the outer sidewall of the mounting plate 1. The connecting pipe 31 has a strip hole 34 that passes through the upper and lower surfaces. The locking components are located inside the strip hole 34 and limit the extension components by abutting. The extension components include an extension rod 32, which is located inside the connecting pipe 31 and is slidably connected. An arc-shaped adapter plate 33 is fixedly installed at the end of the extension rod 32. Preferably, the inner side of the arc-shaped adapter plate 33 can be connected to a resin block or a nylon block so that it can adapt to a rougher pile foundation side. The locking assembly includes a screw 35, which is fixedly mounted on the upper surface of the extension rod 32 and extends out of the slotted hole 34. A threaded sleeve 36 is threaded to one end of the screw 35 extending out of the slotted hole 34. A slider 37 is fixedly mounted on the bottom of the extension rod 32, and the slider 37 is located within the slotted hole 34 below the connecting pipe 31 and is slidably connected. By loosening the threaded sleeve 36, the extension rod 32 can be adjusted back and forth, allowing the arc-shaped adapter plate 33 on the extension rod 32 to fit against the outer side of the pile foundation to be tested. Then, tightening the threaded sleeve 36 generates friction between the threaded sleeve 36 and the end face of the slotted hole 34, restricting the movement of the extension rod 32.

[0042] When resuming work, pre-rotate the screw sleeve 36, then directly pull the two sets of extension rods 32 and the adapter plate. The top of the connecting tube 31 is engraved or coated with scale lines to ensure accurate matching during the push-pull process. When the distance between the two sets of adapter plates is at its maximum, the mounting plate 1 can be placed on top of the pile foundation. At this time, according to the diameter of the pile foundation, the two sets of adapter plates are pushed simultaneously, and the adapter plates will directly drive the extension rods 32 to extend and slide inside the connecting tube 31. According to the scale, the two sets of adapter plates will retract to the same position until they are completely adapted to the pile foundation of the corresponding diameter, thus completing the adaptation and positioning operation. During sliding adjustment, the screw 35 will slide inside the strip hole 34. At this time, the slider 37 will also slide inside the bottom strip hole 34 to ensure its sliding stability and to limit its sliding operation. When in the desired position, the threaded sleeve 36 can be rotated until it abuts against the top of the connecting pipe 31, thereby completing the adjustment of the required spacing position and locking the center of the pile foundation for subsequent operations. The screw 35 and the slider 37 are both located inside the strip hole 34. The positioning tube 5 is fixedly installed on the inner side wall of the mounting plate 1. The positioning tube 5 is designed to facilitate the limiting and anti-deviation of the auxiliary drill pipe during drilling, and also improves the verticality of the drilling.

[0043] This embodiment also provides a method for core drilling testing of pile foundations, including the following steps:

[0044] S1. Adjust the clamping adapter 3 to clamp it on the outer circumference of the pile foundation, so that the positioning hole of the mounting plate 1 is aligned with the core drilling area. The specific steps are as follows: Align the core drilling area on the surface of the mounting plate 1, the two surfaces need to be parallel to each other, and loosen the screw sleeve 36 so that the extension rod 32 can be adjusted back and forth, so that the arc-shaped adapter plate 33 on the extension rod 32 is tightly attached to the outer side of the pile foundation to be tested, and then tighten the screw sleeve 36 so that the screw sleeve 36 and the end face of the strip hole 34 generate friction, restricting the movement of the extension rod 32, thereby completing the clamping.

[0045] S2. Fix the support mechanism 2 to limit the horizontal displacement and vertical position of the adjustment limit mechanism 4. The specific steps are as follows: pull the rotating plate 22 so that the lower surface of the mounting base 23 is in contact with the fixed surface, and then tighten the bolts to fix the support mechanism 2.

[0046] S3. The overlap of the axis of the inner moving cylinder 48, the axis of the positioning hole, and the axis of the pre-drilled hole of the pile foundation to be tested is checked. After the check is completed, the drill pipe is sleeved on the inner side wall of the inner moving cylinder 48 and is limited in the horizontal direction. The outer rotating cylinder 44 rotates and drives the inner moving cylinder 48 to move downward. The drill pipe follows the inner moving cylinder 48 to move downward until the drill pipe is in contact with the surface of the core drilling area. The specific steps are as follows: by rotating the outer rotating cylinder 44, the inner moving cylinder 48 moves down to contact the upper surface of the positioning tube 5. By measuring whether there is an offset between the side wall of the inner moving cylinder 48 and the side wall of the positioning tube 5, it is determined whether the axes of the inner moving cylinder 48 and the positioning tube 5 are coincident. After the test is completed, the drill pipe is inserted into the inner moving cylinder 48. The outer circumference of the drill pipe is matched with the inner circumference of the inner moving cylinder 48, so it is limited by the inner moving cylinder 48. The presence of the limiting frame and the moving limiting rod 411 ensures that the inner moving cylinder 48 will not shake. Then the outer rotating cylinder 44 rotates, driving the inner moving cylinder 48 to move downward. The drill pipe moves downward with the rotating cylinder until the lower surface of the inner moving cylinder 48 abuts the upper surface of the positioning tube 5. During the process of the drill pipe moving downward with the rotating cylinder, it can be ensured that the drill pipe is always vertically downward, which ensures the accuracy of the core drilling. The inner moving cylinder 48 provides one-point positioning, and the positioning tube 5 provides two-point positioning. Vertical double-point positioning is achieved through the inner moving cylinder 48 and the positioning tube 5. When the drill pipe is drilled into the pile foundation to be tested, the axis of the hole formed will coincide with the axis of the inner moving cylinder 48 and the axis of the positioning tube 5. The hole formed will limit the drill pipe, thereby achieving three-point positioning.

[0047] S4. The drill pipe begins core drilling, and the sample to be tested is removed.

[0048] Example 2

[0049] The difference between this embodiment and implementation 1 is that the mounting plate 1 does not have a positioning pipe 5. The original positioning pipe 5 is replaced with a pre-embedded steel pipe that is higher than the depth of the pile foundation. The steel cage is placed in the pile foundation hole and then concrete is poured until it solidifies. During the concrete pouring process, the inside of the pre-embedded steel pipe is poured together to limit the positioning of the pre-embedded steel pipe. At this time, auxiliary drilling can be carried out. After core sampling is performed inside the pre-embedded steel pipe, the concrete is poured again and the core sampling hole is filled.

[0050] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for core drilling testing of pile foundations, characterized in that: It includes a mounting plate, an adjustment and limiting mechanism, a support mechanism, and a clamping and fitting mechanism. The mounting plate has a positioning hole in the middle, and the adjustment and limiting mechanism is located above the mounting plate. The adjusting and limiting mechanism includes two columns, a top plate, a limiting frame, an outer rotating cylinder, an inner moving cylinder, and a drive assembly. The two columns are located on both sides of the mounting plate and are fixedly connected to the support mechanism at their bottoms. The top plate is connected to the top of each column, and a first through hole is provided in the middle of the top plate. The outer rotating cylinder is engaged with the first through hole and is rotatably connected. The outer rotating cylinder has an internal thread, and the inner moving cylinder has an external thread. The inner moving cylinder is located inside the outer rotating cylinder, and the external and internal threads are compatible. The drive assembly is used to drive the outer rotating cylinder to rotate, thereby causing the inner moving cylinder to rise and fall. The limiting frame has a second through hole in the middle, and the second through hole is fixedly connected to the upper end of the outer peripheral surface of the inner moving cylinder. An anti-sway component is also provided between the limiting frame and the top plate. The anti-sway component is used to prevent the limiting frame from swaying horizontally. The clamping adapter mechanism is provided on both sides of the mounting plate. The clamping adapter mechanism is used to clamp the surface of the area to be measured. The adjusting and limiting mechanism also includes a connecting plate located below the top plate. The connecting plate has a third through hole in the middle and is connected to the columns on both sides. The driving assembly includes a driving motor mounted on the connecting plate. A gear is keyed to the output end of the driving motor. The outer rotating cylinder is provided with a gear ring, and the gear and the gear ring mesh with each other. The anti-sway assembly includes two extension plates and two movable limiting rods. The two extension plates are connected to both sides of the limiting frame. The movable limiting rods are fixedly installed on the lower surface of the extension plates. The top plate has through holes on both sides, and the movable limiting rods pass through the through holes. The support mechanism includes two horizontal plates, which are fixedly installed on both sides of the mounting plate. A rotating plate is rotatably connected to the outer end of each horizontal plate, and a mounting base is rotatably connected to the bottom end of each rotating plate. The clamping adapter mechanism includes two sets of mounting components, two sets of locking components, and two sets of extension components. The two sets of mounting components are disposed on both sides of the mounting plate. The extension components are disposed inside the mounting components and are slidably connected. The ends of the extension components can clamp the sidewalls of the area to be tested. The locking components are used to limit the displacement of the extension components after clamping. The mounting assembly includes a connecting tube, which is fixedly mounted on the outer wall of the mounting plate. The connecting tube has a strip-shaped hole that passes through the upper and lower surfaces. The locking assembly is located inside the strip-shaped hole and restricts the extension assembly by abutting against it. The extension assembly includes an extension rod, which is located inside the connecting tube and slidably connected, and an arc-shaped adapter plate is fixedly installed at the end of the extension rod. The locking assembly includes a screw, which is fixedly mounted on the upper surface of the extension rod and extends out of the slot. One end of the screw extending out of the slot is threadedly connected to a threaded sleeve. A slider is fixedly mounted on the bottom of the extension rod and is slidably connected within the slot below the connecting tube.

2. The auxiliary device for core drilling testing of pile foundations according to claim 1, characterized in that: A positioning tube is provided at the positioning hole of the mounting plate.

3. The auxiliary device for core drilling testing of pile foundations according to claim 1, characterized in that: A method for core drilling testing of pile foundations is also provided, including the following steps: S1. Adjust the clamping adapter mechanism to clamp it on the outer circumference of the pile foundation so that the positioning hole of the mounting plate is aligned with the core drilling area. S2. The fixed support mechanism limits the horizontal and vertical displacement of the entire adjusting limit mechanism. S3. Check the overlap of the inner moving cylinder axis, the positioning hole axis and the pre-drilled hole axis of the pile foundation to be tested. After the check is completed, the drill pipe is sleeved on the inner side wall of the inner moving cylinder and is limited in the horizontal direction. The outer rotating cylinder rotates and drives the inner moving cylinder to move downward. The drill pipe moves downward with the inner moving cylinder until the drill pipe is in contact with the surface of the core drilling area. S4. The drill pipe begins core drilling, and the sample to be tested is removed.

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