Device for detecting bearing capacity of pile foundation in limited space and implementation method

Abstract

The invention relates to the technical field of pile foundation bearing capacity detection, in particular to a limited space pile foundation bearing capacity detection device and an implementation method.The limited space pile foundation bearing capacity detection device comprises two main beams, two secondary beams, a diagonal bracing cross frame, a connecting steel frame, a jack, extension blocks, anchor rods and a lifting frame, and the upper portions of the two main beams are connected through the connecting steel frame and the diagonal bracing cross frame; a secondary beam is arranged below the main beam, reinforcing steel is arranged in the two sides of the secondary beam, a jack is arranged below the secondary beam and arranged on a pile foundation, and an extension block, a driving motor and a worm are arranged on the side face of the main beam. The device has the advantages that displacement measurement assemblies such as the main beam, the secondary beam, the inclined strut cross frame, the connecting steel frame, the jack, the extension block, the anchor rod and the lifting frame are integrated, the space limitation is successfully broken through, the pile foundation bearing capacity is effectively detected, meanwhile, hoisting and displacement operation needed by using a concrete load plate is reduced, and related mechanical and labor cost is greatly saved.

Description

Technical Field

[0001] The present invention relates to the technical field of pile foundation bearing capacity detection, and in particular to a confined space pile foundation bearing capacity detection device and an implementation method. Background Art

[0002] A deep foundation consisting of a pile and a pile cap connected to the top of the pile (referred to as the cap) or a single pile foundation connected by a column and a pile foundation is referred to as a pile foundation. If the pile body is completely buried in the soil and the bottom of the cap is in contact with the soil, it is called a low cap pile foundation; if the upper part of the pile body is exposed to the ground and the bottom of the cap is above the ground, it is called a high cap pile foundation. Pile foundations are widely used in high-rise buildings. After the pile foundation construction is completed, the pile foundation needs to be subjected to a load test to detect the bearing capacity of the pile foundation. In the prior art, the static and dynamic method is a convenient and extremely efficient pile foundation detection method.

[0003] In the prior art, the working principle of the static-dynamic method is: a power device is installed on the top of the pile foundation, and through the strong reaction inside the power device, the moving parts inside the power device are instantly in a high-speed rising state. At this time, the power device can exert a high-pressure recoil effect on the pile foundation at the bottom, thereby achieving the effect of detecting the bearing capacity of the pile foundation.

[0004] However, since the concrete load plate required for the static load test occupies a large area, it is not convenient to carry out engineering inspection of confined space pile foundations in urban renewal projects. At the same time, the deadweight of the weight unit is extremely large. When the equipment has finished inspecting one pile foundation, the entire machine needs to be moved to another pile foundation for inspection, which is very cumbersome and laborious, greatly affecting the work efficiency of the equipment in detecting the bearing capacity of the pile foundation. For this reason, the present invention proposes a confined space pile foundation bearing capacity detection device and implementation method to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a confined space pile foundation bearing capacity detection device and implementation method to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a confined space pile foundation bearing capacity detection device, the confined space pile foundation bearing capacity detection device comprising: a main beam, a secondary beam, a diagonal brace cross frame, a connecting steel frame, a jack, an extension block, an anchor rod and a lifting frame, the main beam is provided with two groups, the upper parts of the two groups of main beams are connected by connecting steel frames and diagonal brace cross frames, a secondary beam is provided below the main beam, reinforcement steel is provided inside the two sides of the secondary beam, a jack is provided below the secondary beam, and the jack is provided on the pile foundation;

[0007] A main beam, an epitaxial block, a driving motor and a worm are arranged on the side of the main beam, a lifting frame is arranged below the two ends of the main beam, the lifting frame is arranged on a threaded rod, a worm gear is fixed on the threaded rod, and a rotating wheel is arranged at the bottom of the lifting frame.

[0008] Preferably, both ends of the connecting steel frame are fixed to the main beam by welding, a group of diagonal brace cross frames are fixed between the two groups of connecting steel frames by welding, two groups of diagonal brace cross frames are provided, and the two groups of diagonal brace cross frames are symmetrically distributed about the central axis of the main beam, the main beam and the secondary beam are both I-beams, the output end of the jack is tightly pressed against the secondary beam, displacement sensors are arranged on both sides of the secondary beam, a pile top steel plate is arranged on the pile foundation, and the jack is arranged on the pile top steel plate.

[0009] Preferably, abutment plates are fixed at both ends of the main beam by welding, and drive motors are installed inside both ends of the main beam. The drive motors are located outside the two groups of main beams, and a worm is fixedly connected to the output end of the drive motor, and the end of the worm is rotatably connected to the abutment plate.

[0010] Preferably, a support plate is fixed on the main beam, the support plate is located next to the worm, and there are two groups of support plates, the two groups of support plates are symmetrically distributed about the worm, the two groups of support plates are rotatably connected to the upper half of the threaded rod, the worm wheel is located between the two groups of support plates, and the worm wheel and the worm are adapted to each other.

[0011] Preferably, the lower half of the threaded rod is provided with threads, a bottom block is fixed to the bottom of the threaded rod, and a threaded recessed hole is provided on the surface of the lifting frame, and the threaded recessed hole is matched with the threaded rod.

[0012] Preferably, a guide hole is opened on the surface of the lifting frame, and the guide hole is located next to the threaded recessed hole. A guide rod is fixed to the bottom of the main beam. There are two groups of guide rods, and the two groups of guide rods are symmetrically distributed about the threaded rod. The outer wall of the guide rod and the inner wall of the guide hole are slidably connected.

[0013] Preferably, the overall structure of the lifting frame is in a "7" shape, an inner cavity is opened at the bottom of the lifting frame, a frame rod is fixed in the inner cavity, a rotating wheel is located in the inner cavity, and the rotating wheel is rotatably connected to the frame rod.

[0014] Preferably, an epitaxial block is provided on the side of the main beam, and there are two groups of epitaxial blocks. The two groups of epitaxial blocks are symmetrically distributed about the central axis of the main beam. An insertion rod is fixed on the side of the main beam, and the insertion rod extends to the outside of the main beam. The surface of the epitaxial block has through holes and insertion holes, and the insertion rod can be inserted into the insertion hole. The surfaces of the epitaxial block and the main beam are provided with mounting holes, and stud bolts are provided in the mounting holes. Pressure plates are fixed on both sides of the epitaxial block. The cross-section of the pressure plate is trapezoidal, and the pressure plate can be pressed tightly against the main beam.

[0015] Preferably, a thick steel plate is arranged between the secondary beam and the main beam, the upper surface of the thick steel plate is welded to the two groups of main beams, the secondary beam is welded to the lower surface of the thick steel plate, and reinforcing steel is fixed inside the two sides of the secondary beam by welding. A plurality of reinforcing steels are provided, and the plurality of reinforcing steels are equidistantly linearly distributed on the secondary beam with a spacing of 10 cm.

[0016] A method for implementing a confined space pile foundation bearing capacity detection device comprises the following steps:

[0017] S1: Before pouring the cap concrete, anchor rods are embedded. The position of the anchor rods should be consistent with the through holes on the extension blocks, and a jack is set at the center of the pile foundation;

[0018] S2: Start the driving motor to drive the worm and the worm wheel to work, so that the rotating wheel contacts the ground and the whole device rises, and the whole device is pulled by the traction equipment and moved to the top of the pile foundation;

[0019] S3: When used for the first time, the height of the entire device is adjusted by driving the motor, the anchor rods are inserted into the corresponding through holes, the anchor rods and the extension blocks are fixed by welding, and the driving motor is started to move the rotating wheel away from the ground;

[0020] S4: By starting the jack, the top of the jack will continuously apply pressure to the secondary beam, and the bottom of the jack will apply pressure to the pile foundation. A displacement sensor is installed on the secondary beam, which is connected to the smart terminal to monitor and record the displacement deformation and jack torque in real time, which is used to collect test process data of graded loading of pile foundation bearing capacity.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention proposes a confined space pile foundation bearing capacity detection device and implementation method. In response to the challenge that pile foundation projects in urban renewal projects are difficult to perform static load tests using conventional concrete load plates due to original structural limitations, we have developed a small pile foundation bearing capacity detection device. The device integrates displacement measurement components such as main beams, secondary beams, diagonal cross frames, connecting steel frames, jacks, epitaxial blocks, anchor rods and lifting frames, successfully breaking through space limitations and effectively detecting the pile foundation bearing capacity. At the same time, it avoids the lifting and shifting operations required for the use of concrete load plates, greatly saving related machinery and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the main beam structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the epitaxial block structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the lifting frame structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the threaded rod structure of the present invention;

[0028] Figure 6 It is a top view of the structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the secondary beam structure of the present invention.

[0030] In the figure: 1. anchor rod; 2. diagonal brace cross frame; 3. connecting steel frame; 4. abutment plate; 5. extension block; 6. jack; 7. pile top steel plate; 8. reinforcement steel; 9. pile foundation; 10. secondary beam; 11. rotating wheel; 12. lifting frame; 13. threaded rod; 14. worm gear; 15. main beam; 16. guide rod; 17. plug rod; 18. stud bolt; 19. drive motor; 20. support plate; 21. worm; 22. through hole; 23. plug hole; 24. mounting hole; 25. pressure plate; 26. bottom block; 27. threaded recessed hole; 28. guide hole; 29. ​​inner cavity; 30. frame rod; 31. displacement sensor. DETAILED DESCRIPTION

[0031] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other.

[0032] Example 1: Please refer to Figures 1 to 7 The present invention provides a technical solution: a confined space pile foundation 9 bearing capacity detection device, the confined space pile foundation 9 bearing capacity detection device comprises: a main beam 15, a secondary beam 10, a diagonal brace cross frame 2, a connecting steel frame 3, a jack 6, an extension block 5, an anchor rod 1 and a lifting frame 12, the main beam 15 is provided with two groups, the upper parts of the two groups of main beams 15 are connected by connecting steel frames 3 and diagonal brace cross frames 2, a secondary beam 10 is provided below the main beam 15, reinforcing steel 8 is provided inside the two sides of the secondary beam 10, a jack 6 is provided below the secondary beam 10, and the jack 6 is provided on the pile foundation 9;

[0033] A main beam 15, an epitaxial block 5, a drive motor 19 and a worm 21 are arranged on the side of the main beam 15, a lifting frame 12 is arranged below both ends of the main beam 15, the lifting frame 12 is arranged on a threaded rod 13, a worm gear 14 is fixed on the threaded rod 13, and a rotating wheel 11 is arranged at the bottom of the lifting frame 12, a confined space pile foundation 9 bearing capacity detection device and implementation method, including the confined space pile foundation 9 bearing capacity detection device;

[0034] When in use, the device successfully breaks through the space limitation by integrating the displacement measurement components such as the main beam 15, the secondary beam 10, the diagonal cross frame 2, the connecting steel frame 3, the jack 6, the extension block 5, the anchor rod 1 and the lifting frame 12, and effectively detects the bearing capacity of the pile foundation 9. At the same time, it avoids the lifting and shifting operations required for the use of concrete load plates, and greatly saves the related machinery and labor costs.

[0035] Embodiment 2: On the basis of embodiment 1, both ends of the connecting steel frame 3 are fixed on the main beam 15 by welding, a group of diagonal cross frames 2 are fixed by welding between the two groups of connecting steel frames 3, two groups of diagonal cross frames 2 are provided, and the two groups of diagonal cross frames 2 are symmetrically distributed about the central axis of the main beam 15, the main beam 15 and the secondary beam 10 are both I-beams, the output end of the jack 6 is tightly against the secondary beam 10, and displacement sensors 31 are provided on both sides of the secondary beam 10, a pile top steel plate 7 is provided on the pile foundation 9, and the jack 6 is provided on the pile top steel plate 7;

[0036] When in use, the two sets of connecting steel frames 3 are matched with a set of diagonal bracing cross frames 2 to improve the stability of the two sets of main beams 15 and prevent the two sets of main beams 15 from shifting relative to each other and affecting the experimental data. The jack 6 is connected to the hydraulic pump, which controls the pile top counter pressure and transmits it to the intelligent terminal in time to control, monitor and record the counter pressure. The displacement sensor 31 is a capacitive grid type, which is connected to the intelligent terminal to monitor and record the displacement deformation and the torque of the jack 6 in real time, and intelligently generate a line graph for collecting the test process data of the graded loading of the pile foundation 9 bearing capacity;

[0037] The two ends of the main beam 15 are fixed with abutment plates 4 by welding, and the two ends of the main beam 15 are internally installed with drive motors 19, which are located outside the two groups of main beams 15, and the output end of the drive motor 19 is fixedly connected with a worm 21, and the end of the worm 21 is rotatably connected to the abutment plates 4. The main beam 15 is fixed with a support plate 20, which is located beside the worm 21. There are two groups of support plates 20, and the two groups of support plates 20 are symmetrically distributed about the worm 21. The two groups of support plates 20 are rotatably connected to the upper half of the threaded rod 13, and the worm wheel 14 is located between the two groups of support plates 20, and the worm wheel 14 and the worm 21 are adapted;

[0038] The lower half of the threaded rod 13 is provided with a thread, a bottom block 26 is fixed to the bottom of the threaded rod 13, a threaded concave hole 27 is provided on the surface of the lifting frame 12, the threaded concave hole 27 is adapted to the threaded rod 13, a guide hole 28 is provided on the surface of the lifting frame 12, and the guide hole 28 is located next to the threaded concave hole 27, a guide rod 16 is fixed to the bottom of the main beam 15, and two groups of guide rods 16 are provided, and the two groups of guide rods 16 are symmetrically distributed about the threaded rod 13, and the outer wall of the guide rod 16 and the inner wall of the guide hole 28 are in sliding connection;

[0039] When in use, by starting the driving motor 19, the output end of the driving motor 19 will drive the worm 21 to rotate, thereby causing the worm wheel 14 to rotate, thereby driving the threaded rod 13 to rotate, and the lifting frame 12 screwed to the threaded rod 13 will move, thereby adjusting the position of the rotating wheel 11, facilitating the adjustment of the overall height of the device, and facilitating the use of a traction device to move the equipment as a whole, wherein the set guide rod 16 corresponding to the continuous sliding in the guide hole 28 can provide a limit for the lifting frame 12, avoid the displacement of the lifting frame 12, and ensure the stability of the rotating wheel 11, and when the lifting frame 12 moves to the bottom of the threaded rod 13, it will be pressed against the bottom block 26, and the bottom block 26 set at the bottom of the threaded rod 13 prevents the lifting frame 12 from falling off from under the threaded rod 13.

[0040] Embodiment 3: On the basis of embodiment 2, an epitaxial block 5 is arranged on the side of the main beam 15, and two groups of epitaxial blocks 5 are arranged. The two groups of epitaxial blocks 5 are symmetrically distributed about the central axis of the main beam 15. A plug rod 17 is fixed to the side of the main beam 15, and the plug rod 17 extends to the outside of the main beam 15. The surface of the epitaxial block 5 has a through hole 22 and a plug hole 23, and the plug rod 17 can be inserted into the plug hole 23. The surfaces of the epitaxial block 5 and the main beam 15 are provided with mounting holes 24, and stud bolts 18 are arranged in the mounting holes 24. Pressure plates 25 are fixed on both sides of the epitaxial block 5. The cross section of the pressure plate 25 is trapezoidal, and the pressure plate 25 can be tightly pressed against the main beam 15;

[0041] When using it for the first time, it is necessary to insert the insertion rod 17 into the corresponding insertion hole 23 and weld it to fix it. When the measurement is completed, it is necessary to cut the anchor rod 1 and cut off the anchor rod 1 below the epitaxial block. Then, start the starting motor again and make the rotating wheel 11 contact the ground to facilitate the movement of the device as a whole to the next pile foundation 9. Then, the anchor rod 1 at the pile foundation 9 to be measured is abutted against the lower surface of the epitaxial block 5 and fixed by welding. After the epitaxial block 5 has been welded for many times, the epitaxial block 5 can be replaced in time to improve the construction efficiency. The specific operation The method is as follows: by removing the stud bolts 18 and pulling the rod 17 out of the socket 23, the epitaxial block 5 is removed, and a new epitaxial block 5 is moved so that the rod 17 is correspondingly inserted into the socket 23 and continuously pushed, so that the epitaxial block 5 and the pressure plate 25 are embedded in the inner side of the main beam 15. The rod 17 and the socket 23 can form a pre-positioning so that the mounting hole 24 of the main beam 15 corresponds to the mounting hole 24 of the epitaxial block 5, which is convenient for the installation of the stud bolts 18. The pressure plate 25 can increase the contact area between the epitaxial block 5 and the main beam 15, and improve the stability during measurement.

[0042] A thick steel plate is arranged between the secondary beam 10 and the main beam 15. The upper surface of the thick steel plate is welded to the two sets of main beams 15. The secondary beam 10 is welded to the lower surface of the thick steel plate. Reinforcement steels 8 are fixed to the inside of both sides of the secondary beam 10 by welding. There are several reinforcement steels 8. The several reinforcement steels 8 are evenly distributed linearly on the secondary beam 10, and the interval is 10 cm.

[0043] When in use, a thick steel plate with a thickness of 2 cm is added between the main beam 15 and the secondary beam 10 to improve the stability of the secondary beam 10 and the main beam 15 when the jack 6 applies force. At the same time, a number of evenly distributed reinforcing steels 8 are welded on both sides of the secondary beam 10 to ensure the stability of the secondary beam 10 and prevent the flange of the secondary beam 10 from deforming and affecting the test results.

[0044] Working principle: In actual use, the anchor rod 1 is embedded before pouring the concrete of the foundation, and the drive motor 19 is started to drive the worm 21 and the worm wheel 14 to work, so that the runner 11 contacts the ground and the whole device rises. The whole device is pulled by the traction equipment and moved to the top of the pile foundation 9, the anchor rod 1 and the extension block 5 are welded and fixed, and the height of the runner 11 is adjusted to make the runner 11 move out of the ground, and the top of the jack 6 will continue to apply pressure to the secondary beam 10 by starting the jack 6, and the bottom of the jack 6 will apply pressure to the pile foundation 9, the secondary beam 10 A displacement sensor 31 is arranged on top, which is connected to the intelligent terminal to carry out real-time monitoring and record the displacement deformation and the torque of the jack 6, so as to collect the test process data of the graded loading of the bearing capacity of the pile foundation 9. This avoids the following problems: since the concrete load plate required for the static load test occupies a large area, it is not convenient to carry out engineering inspection of the confined space pile foundation 9 in the urban renewal project; at the same time, the deadweight unit has a very large weight. When the equipment has inspected one pile foundation 9, the whole machine needs to be moved to another pile foundation 9 for inspection, which is very cumbersome and laborious, greatly affecting the work efficiency of the equipment in inspecting the bearing capacity of the pile foundation 9.

[0045] A method for implementing a bearing capacity detection device for a confined space pile foundation 9 comprises the following steps:

[0046] S1: Before pouring the cap concrete, pre-embed the anchor rod 1, the position of the anchor rod 1 should be consistent with the through hole 22 on the extension block 5, and the jack 6 is set at the center of the pile foundation 9;

[0047] S2: Start the driving motor 19 to drive the worm 21 and the worm wheel 14 to work, so that the rotating wheel 11 contacts the ground and the whole device rises, and the whole device is pulled by the pulling device and moved to the top of the pile foundation 9;

[0048] S3: When used for the first time, the height of the entire device is adjusted by driving the motor 19, the anchor rod 1 is correspondingly inserted into the through hole 22, the anchor rod 1 and the extension block 5 are fixed by welding, and the driving motor 19 is started to move the rotating wheel 11 away from the ground;

[0049] S4: By starting the jack 6, the top of the jack 6 will continuously apply pressure to the secondary beam 10, and at the same time the bottom of the jack 6 will apply pressure to the pile foundation 9. A displacement sensor 31 is provided on the secondary beam 10, which is connected to the smart terminal to monitor and record the displacement deformation and the torque of the jack 6 in real time, and is used to collect test process data of graded loading of the pile foundation 9 bearing capacity.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A confined space pile foundation bearing capacity detection device, characterized in that: The confined space pile foundation bearing capacity detection device comprises: a main beam (15), a secondary beam (10), a diagonal bracing cross frame (2), a connecting steel frame (3), a jack (6), an extension block (5), an anchor rod (1) and a lifting frame (12), wherein the main beam (15) is provided with two groups, the upper parts of the two groups of main beams (15) are connected by connecting steel frames (3) and diagonal bracing cross frames (2), a secondary beam (10) is provided below the main beam (15), reinforcing steel (8) is provided inside both sides of the secondary beam (10), a jack (6) is provided below the secondary beam (10), and the jack (6) is provided on the pile foundation (9); A main beam (15), an epitaxial block (5), a driving motor (19) and a worm (21) are arranged on the side of the main beam (15), a lifting frame (12) is arranged below both ends of the main beam (15), the lifting frame (12) is arranged on a threaded rod (13), a worm wheel (14) is fixed on the threaded rod (13), and a rotating wheel (11) is arranged at the bottom of the lifting frame (12).

2. A confined space pile foundation bearing capacity detection device according to claim 1, characterized in that: The two ends of the connecting steel frame (3) are fixed to the main beam (15) by welding, and a group of diagonal bracing cross frames (2) are fixed between the two groups of connecting steel frames (3) by welding. The diagonal bracing cross frames (2) are provided with two groups, and the two groups of diagonal bracing cross frames (2) are symmetrically distributed about the central axis of the main beam (15). The main beam (15) and the secondary beam (10) are both I-beams. The output end of the jack (6) and the secondary beam (10) are tightly abutted. Displacement sensors (31) are provided on both sides of the secondary beam (10). A pile top steel plate (7) is provided on the pile foundation (9), and the jack (6) is provided on the pile top steel plate (7).

3. A confined space pile foundation bearing capacity detection device according to claim 1, characterized in that: The two ends of the main beam (15) are fixed with abutment plates (4) by welding, and drive motors (19) are installed inside the two ends of the main beam (15). The drive motors (19) are located outside the two groups of main beams (15), and the output end of the drive motor (19) is fixedly connected to a worm (21), and the end of the worm (21) is rotatably connected to the abutment plate (4).

4. A confined space pile foundation bearing capacity detection device according to claim 1, characterized in that: A support plate (20) is fixed on the main beam (15), the support plate (20) is located beside the worm (21), and two groups of support plates (20) are provided. The two groups of support plates (20) are symmetrically distributed about the worm (21), and the two groups of support plates (20) are rotatably connected to the upper half of the threaded rod (13). The worm wheel (14) is located between the two groups of support plates (20), and the worm wheel (14) and the worm (21) are adapted.

5. The confined space pile foundation bearing capacity detection device according to claim 1, characterized in that: The lower half of the threaded rod (13) is provided with threads, a bottom block (26) is fixed to the bottom of the threaded rod (13), and a threaded concave hole (27) is provided on the surface of the lifting frame (12), and the threaded concave hole (27) and the threaded rod (13) are adapted to each other.

6. A confined space pile foundation bearing capacity detection device according to claim 1, characterized in that: A guide hole (28) is provided on the surface of the lifting frame (12), and the guide hole (28) is located next to the threaded concave hole (27). A guide rod (16) is fixed to the bottom of the main beam (15), and two groups of guide rods (16) are provided. The two groups of guide rods (16) are symmetrically distributed about the threaded rod (13), and the outer wall of the guide rod (16) and the inner wall of the guide hole (28) are slidably connected.

7. The confined space pile foundation bearing capacity detection device according to claim 1, characterized in that: The overall structure of the lifting frame (12) is in the shape of a letter "7". An inner cavity (29) is provided at the bottom of the lifting frame (12). A frame rod (30) is fixed in the inner cavity (29). The rotating wheel (11) is located in the inner cavity (29) and is rotatably connected to the frame rod (30).

8. The confined space pile foundation bearing capacity detection device according to claim 1, characterized in that: An epitaxial block (5) is arranged on the side of the main beam (15). The epitaxial block (5) is provided with two groups. The two groups of epitaxial blocks (5) are symmetrically distributed about the central axis of the main beam (15). A plug rod (17) is fixed on the side of the main beam (15). The plug rod (17) extends to the outside of the main beam (15). The surface of the epitaxial block (5) is provided with a through hole (22) and a plug hole (23). The plug rod (17) can be inserted into the plug hole (23). The surfaces of the epitaxial block (5) and the main beam (15) are provided with mounting holes (24). Stud bolts (18) are arranged in the mounting holes (24). Pressure plates (25) are fixed on both sides of the epitaxial block (5). The cross section of the pressure plate (25) is trapezoidal. The pressure plate (25) can be tightly pressed against the main beam (15).

9. The confined space pile foundation bearing capacity detection device according to claim 1, characterized in that: A thick steel plate is arranged between the secondary beam (10) and the main beam (15), the upper surface of the thick steel plate is welded to the two groups of main beams (15), the secondary beam (10) is welded to the lower surface of the thick steel plate, and reinforcing steels (8) are fixed inside the two sides of the secondary beam (10) by welding, and a plurality of reinforcing steels (8) are provided, and the plurality of reinforcing steels (8) are evenly distributed linearly on the secondary beam (10), and the interval distance is 10 cm.

10. The implementation method of the confined space pile foundation bearing capacity detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Before pouring the cap concrete, pre-embed the anchor rod (1), the position of the anchor rod (1) should be consistent with the through hole (22) on the extension block (5), and a jack (6) is set at the center of the pile foundation (9); S2: starting the driving motor (19), thereby driving the worm (21) and the worm wheel (14) to work, so that the rotating wheel (11) contacts the ground and the whole device rises, and the whole device is pulled by the pulling device and moved to the top of the pile foundation (9); S3: When used for the first time, the height of the entire device is adjusted by driving the motor (19), the anchor rod (1) is correspondingly inserted into the through hole (22), the anchor rod (1) and the extension block (5) are fixed by welding, and the driving motor (19) is started to move the rotating wheel (11) away from the ground; S4: By starting the jack (6), the top of the jack (6) will continuously apply pressure to the secondary beam (10), and at the same time, the bottom of the jack (6) will apply pressure to the pile foundation (9). A displacement sensor (31) is provided on the secondary beam (10), which is connected to the intelligent terminal to monitor and record the displacement deformation and the torque of the jack (6) in real time, so as to collect test process data of graded loading of the bearing capacity of the pile foundation (9).

Images