A cutting device and method for internal cutting of large-diameter steel pipe piles

Abstract

This application relates to an internal cutting device and method for large-diameter steel pipe piles, belonging to the technical field of steel pipe pile cutting. It includes a base, a lifting rod, a rotating disk, a telescopic connecting rod, a first cutting component, a second cutting component, a cutting compensation component, and a clamping assembly. One end of the lifting rod is mounted on the base, and the other end is connected to the rotating disk, which can rotate around the axis of the lifting rod. One end of the telescopic connecting rod is mounted on the rotating disk, and the other end is connected to the cutting compensation assembly. The clamping assembly is mounted on the cutting compensation assembly and is used to clamp the first cutting component and the second cutting component sequentially. The cutting compensation assembly is used to make the clamping assembly tend to move away from the lifting support rod. This application has the effect of improving the internal cutting quality of large-diameter steel pipe piles.

Description

Technical Field

[0001] This application relates to the field of steel pipe pile cutting, and in particular to a cutting device and method for internal cutting of large-diameter steel pipe piles. Background Technology

[0002] During the construction of waterway engineering projects, large-diameter steel pipe piles are often inserted into the underwater foundation. Then, the silt and water inside the steel pipe piles are extracted until the surface of the silt is lower than the target cutting position. At this point, electro-oxygen cutting or other methods are used to cut the inner wall of the large-diameter steel pipe pile. During the cutting process, a crane is used to suspend the upper part of the large-diameter steel pipe pile to prevent the upper part of the steel pipe pile from suddenly dropping after the cutting is completed, which could cause unnecessary losses.

[0003] Currently, the commonly used cutting method is electro-oxygen cutting, in which the worker uses a handheld cutting tool to melt the inner wall of the steel pipe pile using the high heat generated by the combustion of oxygen, thereby achieving the cutting. However, when cutting the inner wall of a steel pipe pile with a diameter of 6.6m, the cutting trajectory can reach about 20m in length. Therefore, if the worker relies solely on a handheld cutting tool to cut the inner wall of the steel pipe pile, the worker's arm is prone to fatigue when maintaining the same posture for a long time, which affects the cutting quality. Summary of the Invention

[0004] In order to improve the cutting quality of large-diameter steel pipe piles, this application provides an internal cutting device for large-diameter steel pipe piles.

[0005] The technical solution for the large-diameter steel pipe pile internal cutting equipment provided in this application is as follows:

[0006] The device includes a base, a lifting rod, a rotating disk, a telescopic connecting rod, a cutting component one, a cutting component two, a cutting compensation component, and a clamping component. One end of the lifting rod is mounted on the base, and the other end is connected to the rotating disk. The rotating disk can rotate around the axis of the lifting rod. One end of the telescopic connecting rod is mounted on the rotating disk, and the other end is connected to the cutting compensation component. The clamping component is mounted on the cutting compensation component and is used to clamp cutting component one and cutting component two sequentially. The cutting compensation component is used to make the clamping component tend to move away from the lifting support rod.

[0007] By adopting the above technical solution, the base is first set at the center of the steel pipe pile. Then, the height of the lifting support rod is adjusted to adjust the height of the rotating disk. The first cutting piece is then clamped by the clamping assembly. Subsequently, the length of the telescopic connecting rod is adjusted so that the clamping assembly on the telescopic connecting rod can press against the inner wall of the steel pipe pile after clamping the first cutting piece. As the first cutting piece is started, the cutting compensation assembly ensures that the first cutting piece is always pressed against the inner wall of the steel pipe pile during the cutting process. The operator only needs to push the telescopic connecting rod to rotate with the rotating disk to complete a circular cutting stroke inside the steel pipe pile. Then, the first cutting piece is replaced with the second cutting piece to continue cutting. The whole process does not require the operator to hold the first and second cutting pieces to cut the inner wall of the steel pipe pile, reducing the hand fatigue and tremors caused by the operator holding the first or second cutting piece for a long time, thus achieving the effect of ensuring cutting quality.

[0008] Optionally, the clamping assembly includes clamping block one and clamping block two. Both clamping block one and clamping block two are mounted on the cutting compensation assembly. The cutting compensation assembly is provided with a connecting part. Clamping elements are passed through clamping block one and clamping block two respectively. After passing through clamping block one and clamping block two, the clamping elements are connected to the connecting part by means of thread engagement. A clamping space is formed between clamping block one and clamping block two for clamping cutting piece one and cutting piece two. Cutting piece one and cutting piece two are used to cut the inner wall of large-diameter steel pipes one after the other.

[0009] By adopting the above technical solution, the operator can tighten the clamping parts to make clamping block one and clamping block two move towards each other on the cutting compensation component, thereby clamping cutting part one. After cutting part one is used up, the clamping parts can be loosened to make clamping block one and clamping block two move away from each other on the cutting compensation component, thereby replacing cutting part one with cutting part two. Then, tightening the clamping parts again will clamp cutting part two.

[0010] Optionally, the cutting compensation assembly includes a first fixed plate, a second fixed plate, two guide shafts, and two first springs. The first fixed plate and the second fixed plate are parallel to each other. The first fixed plate is installed on the end of the telescopic connecting rod away from the rotating disk. Both guide shafts are installed between the first fixed plate and the second fixed plate. One end of the guide shaft is connected to the second fixed plate, and the other end of the guide shaft passes vertically through the first fixed plate and slides with the first fixed plate. The first spring is fitted on the guide shaft. One end of the first spring is connected to the first fixed plate, and the other end of the first spring is connected to the second fixed plate. The first clamping block and the second clamping block are slidably connected on the side of the second fixed plate away from the first fixed plate, and the connecting part is set on the second fixed plate.

[0011] By adopting the above technical solution, the first fixing plate is installed on the telescopic connecting rod, while the second fixing plate is equipped with a guide rod. The guide rod is fitted with a spring at both ends, which abuts against the first fixing plate and the second fixing plate respectively. When the operator adjusts the length of the telescopic connecting rod so that the first cutting piece or the second cutting piece abuts against the inner wall of the large-diameter steel pipe pile, the spring is in a compressed state. Thus, even if the first cutting piece is worn out during the cutting process, the spring can still abut against the inner wall of the large-diameter steel pipe pile, thereby ensuring the continuity of the cutting operation.

[0012] Optionally, each of the two guide shafts has a limiting element at one end that passes through the fixing plate, and the limiting element is connected to the guide shaft by a threaded connection.

[0013] By adopting the above technical solution, the limiting component ensures that when spring one returns to its original extension amount, the guide rod will not easily detach from the fixed plate one, thereby causing the connection between fixed plate one and fixed plate two to fail. At the same time, the compression amount of spring one can be adjusted by twisting the limiting component, thereby adjusting the tightness of cutting part one and cutting part two when they abut against the inner wall of the large-diameter steel pipe pile.

[0014] Optionally, a mounting base 1 is provided on the fixing plate 1, and a mounting base 2 is provided on the fixing plate 2. A measuring rod is provided on the mounting base 1 and the mounting base 2. The measuring rod 1 passes through the mounting base 1 and the mounting base 2 in sequence and abuts against the inner wall of the large-diameter steel pipe. The other end of the measuring rod is provided with a limiting part. The measuring rod is provided with a scale line for measuring the cutting depth of the cutting part 1. The value of the scale line gradually increases from the direction close to the limiting part to the direction away from the limiting part.

[0015] By adopting the above technical solution, a mounting seat 1 is set on a fixing plate 1, and a mounting seat 2 is set on a fixing plate 2. One end of the measuring rod passes through the mounting seat 1 and the mounting seat 2 in sequence and then abuts against the inner wall of the large-diameter steel pipe pile. The other end of the measuring rod is provided with a limiting part, which prevents the measuring rod from easily coming off the mounting seat 1 or the mounting seat 2. The measuring rod is provided with scale lines whose scale values ​​gradually increase from the direction near the limiting part to the direction away from the limiting part, so that the measuring rod can reflect the cutting depth of the cutting trajectory through the scale lines.

[0016] Optionally, a second spring is fitted on the measuring rod, with one end of the second spring connected to the mounting base and the other end of the second spring connected to the limiting part.

[0017] By adopting the above technical solution, one end of spring two is connected to mounting base one, and the other end of spring two is connected to the limiting part on the measuring rod. This makes the limiting part continuously deepen as the cutting trajectory deepens, and the length of spring two gradually increases. The elastic force of spring two returning to its original position will make the end of the measuring rod always press against the inner wall of the large-diameter steel pipe pile.

[0018] Optionally, the lifting support rod includes a lifting rod one and a lifting rod two. One end of the lifting rod one is mounted on the base, and the other end of the lifting rod one passes through the lifting rod two. The end of the lifting rod two away from the lifting rod one is connected to the rotating disk. The rotating disk can rotate around the axis of the lifting rod two. The lifting rod two and the lifting rod one are connected by a threaded connection. A positioning nut is fitted on the lifting rod one.

[0019] By adopting the above technical solution, the height of the rotating disk is adjusted by driving the second lifting rod to rotate around its own axis, thereby enabling the first cutting piece and the second cutting piece to be adapted to pre-designed cutting trajectories at different heights.

[0020] Optionally, the telescopic connecting rod includes a connecting rod one and a connecting rod two. One end of the connecting rod one is mounted on the rotating disk, and the other end of the connecting rod one is sleeved on the connecting rod two. The end of the connecting rod two away from the connecting rod one is connected to the fixed plate one, and the connecting rod two and the connecting rod one are in sliding fit.

[0021] By adopting the above technical solution, the extension length of the sliding connecting rod 2 within the connecting rod 1 allows either the cutting part 1 or the cutting part 2 to be applicable to the inner diameter of large-diameter steel pipe piles of different sizes.

[0022] Secondly, this application provides a method for internal cutting of large-diameter steel pipe piles, using the aforementioned internal cutting equipment for large-diameter steel pipe piles, comprising the following steps:

[0023] S100: Set the base at the center of the large-diameter steel pipe pile, install the cutting piece one between clamping block one and clamping block two, and adjust the height of the cutting piece one by the lifting support rod so that the cutting piece one is at the same height as the preset cutting position in the inner wall of the large-diameter steel pipe pile. Adjust the length of the telescopic connecting rod so that the cutting piece one abuts against the inner wall of the steel pipe pile.

[0024] S200: Drive the telescopic connecting rod so that the telescopic connecting rod moves in a circle around the axis of the lifting support rod inside the large-diameter steel pipe pile, and simultaneously starts the cutting part one. The cutting part one performs preliminary cutting at the preset cutting position on the inner wall of the large-diameter steel pipe pile. The cutting compensation component ensures that the cutting part one is always in contact with the inner wall of the steel pipe pile during the cutting process.

[0025] S300: After the steel pipe pile is suspended by a crane, the first cutting part is replaced with the second cutting part. The second cutting part completely cuts the large-diameter steel pipe pile along the cutting trajectory of the first cutting part.

[0026] S400: The crane lifts and moves the cut large-diameter steel pipe pile away.

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

[0028] 1. By setting up a base, lifting support rod, rotating disk, telescopic connecting rod, and setting a cutting compensation component and a clamping component for clamping cutting part one or cutting part two on the telescopic connecting rod, the operator can cut on the inner wall of the large-diameter steel pipe pile without holding cutting part one or cutting part two by hand. This reduces the occurrence of hand fatigue and trembling due to maintaining the same posture for a long time, which affects the cutting quality and achieves the effect of improving the cutting quality.

[0029] 2. By setting the telescopic connecting rod as connecting rod one and connecting rod two, and allowing connecting rod two to slide within connecting rod one to adjust the extension length of connecting rod two on connecting rod one, cutting part one or cutting part two can be applied to the inner diameter of large-diameter steel pipe piles of different sizes, thus achieving a wider range of applications. Attached Figure Description

[0030] Figure 1 This is a three-dimensional schematic diagram of an internal cutting device for large-diameter steel pipe piles according to this application;

[0031] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the application of internal cutting equipment for medium and large diameter steel pipe piles inside large diameter steel pipe piles.

[0032] Figure 3 yes Figure 1 A magnified view of a portion of the image;

[0033] Figure 4 yes Figure 3 A structural diagram from another perspective.

[0034] Explanation of reference numerals in the attached drawings: 1. Base; 2. Lifting support rod; 3. Rotating disk; 4. Telescopic connecting rod; 5. Cutting component one; 6. Cutting component two; 7. Cutting compensation assembly; 8. Clamping assembly; 9. Clamping block one; 10. Clamping block two; 11. Connecting part; 12. Clamping component; 13. Fixing plate one; 14. Fixing plate two; 15. Guide shaft; 16. Spring one; 17. Limiting component; 18. Mounting seat one; 19. Mounting seat two; 20. Measuring rod; 21. Limiting part; 22. Scale line; 23. Spring two; 24. Lifting rod one; 25. Lifting rod two; 26. Positioning nut; 27. Connecting rod one; 28. Connecting rod two. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0036] Example 1:

[0037] Embodiment 1 of this application discloses a large-diameter steel pipe pile internal cutting device, referring to... Figure 1-2 The system includes a base 1, a lifting support rod 2, a rotating disk 3, a telescopic connecting rod 4, a cutting compensation assembly 7, a clamping assembly 8, a first cutting part 5, and a second cutting part 6. The first cutting part 5 is a cutting head for carbon arc gouging, while the second cutting part 6 is a cutting head for electro-oxygen cutting. The base 1 is placed on the upper surface of the mud surface inside the large-diameter steel pipe pile, and the lifting support rod 2 is vertically connected to the base 1. The lifting support rod 2 is coaxial with the large-diameter steel pipe pile. The lifting support rod 2 includes a first lifting rod 24 and a second lifting rod 25. The first lifting rod 24 is vertically connected to the base 1. The second lifting rod 25 is mounted on the first lifting rod 24. The second lifting rod 25 and the first lifting rod 24 are connected by a threaded connection. The end of the second lifting rod 25 away from the first lifting rod 24 is rotatably connected to the rotating disk 3. The rotating disk 3 can rotate relative to the axis of the second lifting rod 25. One end of the telescopic connecting rod 4 is connected to the rotating disk 3, and the other end of the telescopic connecting rod 4 is connected to the cutting compensation component 7. The clamping component 8 is installed on the side of the cutting compensation component 7 away from the telescopic connecting rod 4.

[0038] A positioning nut 26 is also provided on the lifting rod 24. The positioning nut 26 is connected to the lifting rod 24 by a threaded connection. When the lifting rod 25 drives the rotating disk 3 to rise or fall to the target height, the height of the lifting rod 25 on the lifting rod 24 can be fixed by tightening the positioning nut 26 so that the positioning nut 26 abuts against the lower end face of the lifting rod 25.

[0039] Reference Figure 2-3 The telescopic connecting rod 4 includes a first connecting rod 27 and a second connecting rod 28. One end of the first connecting rod 27 is connected to the rotating disk 3. The end of the first connecting rod 27 away from the rotating disk 3 is sleeved on the second connecting rod 28. The second connecting rod 28 can slide along the axis of the first connecting rod 27 on the first connecting rod 27. The end of the second connecting rod 28 away from the first connecting rod 27 is connected to the cutting compensation component 7. A limiting bolt is also provided on the outer wall of the end of the first connecting rod 27 away from the rotating disk 3. The operator can tighten the limiting bolt to prevent the extension length of the second connecting rod 28 on the first connecting rod 27 from easily changing.

[0040] The cutting compensation assembly 7 includes a first fixing plate 13, a second fixing plate 14, two guide shafts 15, and two springs 16. The first fixing plate 13 and the second fixing plate 14 are parallel to each other. The first fixing plate 13 is installed at the end of the telescopic connecting rod 4 furthest from the rotating disk 3. Both guide shafts 15 are located between the first fixing plate 13 and the second fixing plate 14. One end of each guide shaft 15 is perpendicularly connected to the second fixing plate 14, and the other end passes through the first fixing plate 13 and is connected to a limiting member 17. The fixed plate 13 can slide along its own axis. The limiting member 17 and the guide shaft 15 can be connected by a threaded connection. The two springs 16 are respectively sleeved on the two guide shafts 15. The two springs 16 are located between the fixed plate 13 and the fixed plate 14. One end of the spring 16 is connected to the fixed plate 13, and the other end of the spring 16 is connected to the fixed plate 14. The limiting member 17 is used to prevent the guide shaft 15 from coming out of the fixed plate and also to control the degree of compression of the spring 16.

[0041] The clamping assembly 8 includes clamping block 1 9 and clamping block 2 10. A dovetail groove is provided on the side of the fixing plate 2 14 away from the guide shaft 15. Clamping block 1 9 and clamping block 2 10 are both engaged in the dovetail groove and can move relative to each other or back to back along the length of the dovetail groove. A connecting part 11 is provided on the fixing plate 2 14, and clamping members 12 are respectively provided on clamping block 1 9 and clamping block 2 10. The clamping members 12 can be connected to the connecting part 11 by threaded engagement, thereby realizing the relative movement of clamping block 1 9 and clamping block 2 10 on the fixing plate 2 14. A clamping space for clamping cutting part 1 5 and cutting part 2 6 is provided between clamping block 1 9 and clamping block 2 10. This allows the operator to replace cutting part 1 5 after use and then clamp cutting part 2 6 by clamping block 1 9 and clamping block 2 10.

[0042] Reference Figure 2 and Figure 4A mounting base 18 is provided on a fixing plate 13, and a mounting base 19 is provided on a fixing plate 14 at a position corresponding to the mounting base 18. A measuring rod 20 is provided on the mounting base 18 and the mounting base 19. One end of the measuring rod 20 passes through the mounting base 18 and the mounting base 19 and abuts against the inner wall of the large-diameter steel pipe pile. A steel ball is provided on the end face of the measuring rod 20 that abuts against the inner wall of the large-diameter steel pipe pile, so that the measuring rod 20 can slide smoothly on the inner wall of the large-diameter steel pipe pile. The other end of the measuring rod 20 is provided with a limiting part 21, and a spring is sleeved on the measuring rod 20 near the limiting part 21. Spring 23 has one end connected to mounting base 18 and the other end connected to fixing plate 13. This allows the measuring rod 20 to gradually cut grooves into the inner wall of the large-diameter steel pipe pile as the cutting part 5 is used. The cutting end of the cutting part 5 will abut against the bottom of the groove under the action of spring 16. At this time, since the end of the measuring rod 20 abuts against the inner wall of the large-diameter steel pipe pile, the length of spring 23 will be stretched. Thus, under the elastic force of spring 23, the measuring rod 20 can always abut against the inner wall of the large-diameter steel pipe pile.

[0043] Furthermore, to facilitate staff understanding of the cutting depth, a scale line 22 is provided on the measuring rod 20, with the scale value gradually increasing from near the limit part 21 to away from the limit part 21. The 0 mark position of the scale line 22 is flush with the side of the fixing plate 13 near the scale spring 23 when the spring 23 is in its original position.

[0044] The implementation principle of Embodiment 1 of this application is as follows: First, the base 1 is placed inside the large-diameter steel pipe pile, so that the lifting support rod 2 on the base 1 is coaxial with the large-diameter steel pipe pile. Then, the height of the lifting support rod 2 is adjusted so that the rotating disk 3 and the cutting compensation component 7 and the clamping component 8 on the rotating disk 3 can be flush with the target cutting height. Then, the length of the telescopic connecting rod 4 is adjusted so that the cutting component 5 and the measuring rod 20 can abut against the inner wall of the large-diameter steel pipe pile. At this time, the spring 16 is in a compressed state, while the spring 23 is in its original length.

[0045] Then, the cutting component 5 is activated, and the telescopic connecting rod 4 is pushed to make the cutting component and the measuring rod 20 rotate around the axis of the lifting support rod 2 inside the large-diameter steel pipe pile. As the cutting component 5 cuts on the inner wall of the large-diameter steel pipe pile, a groove will gradually appear on the inner wall of the large-diameter steel pipe pile. Under the action of the spring 16, the cutting component 5 is always in contact with the ground of the groove formed after cutting, while the spring 23 is stretched. At this time, the cutting depth of the cutting component 5 on the large-diameter steel pipe pile is judged by reading the scale value on the measuring rod 20. When the cutting depth reaches the expected level, the cutting component 5 is removed from the clamping assembly 8 and replaced with the cutting component 6. The telescopic connecting rod 4 is pushed again, so that the cutting component 6 can completely cut the inner wall of the large-diameter steel pipe pile.

[0046] Example 2:

[0047] Embodiment 2 of this application provides a method for internal cutting of large-diameter steel pipe piles, which uses the aforementioned large-diameter steel pipe pile internal cutting equipment and includes the following steps:

[0048] S100: Set the base 1 at the center of the large-diameter steel pipe pile, install the cutting part 5 between the clamping block 9 and the clamping block 10, and adjust the height of the cutting part 5 by the lifting support rod 2 so that the cutting part 5 is at the same height as the preset cutting position in the inner wall of the large-diameter steel pipe pile. Adjust the length of the telescopic connecting rod 4 so that the cutting part 5 abuts against the inner wall of the steel pipe pile.

[0049] S200: Drive the telescopic connecting rod 4 so that the telescopic connecting rod 4 moves in a circle around the axis of the lifting support rod 2 inside the large-diameter steel pipe pile, and simultaneously start the cutting part 5. The cutting part 5 performs preliminary cutting at the preset cutting position on the inner wall of the large-diameter steel pipe pile. The cutting compensation component 7 ensures that the cutting part 5 is always in contact with the inner wall of the steel pipe pile during the cutting process.

[0050] S300: After the steel pipe pile is suspended by a crane, the cutting part 5 is replaced with the cutting part 6. The cutting part 6 completely cuts the large-diameter steel pipe pile along the cutting trajectory of the cutting part 5.

[0051] S400: The crane lifts and moves the cut large-diameter steel pipe pile away.

[0052] In step S200 above, cutting component 5 uses carbon arc gouging to initially cut the inner wall of the large-diameter steel pipe pile, making the wall thickness at the preset cutting position thinner. In the subsequent step S300, cutting component 6 uses electro-oxygen cutting to cut the inner wall of the large-diameter steel pipe pile. Since cutting component 5 has already thinned the wall thickness at the preset cutting position in step S200, the efficiency of cutting component 6 is improved. At the same time, since there is usually a lot of water distributed outside the large-diameter steel pipe pile, when cutting component 6 starts working, cutting point can be randomly selected at the cutting trajectory left by cutting component 5 to observe whether a large amount of water will flow back into the large-diameter steel pipe pile, thereby improving the safety of workers during construction.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large-diameter steel pipe pile internal cutting device, characterized in that: The device includes a base (1), a lifting support rod (2), a rotating disk (3), a telescopic connecting rod (4), a first cutting component (5), a second cutting component (6), a cutting compensation assembly (7), and a clamping assembly (8). One end of the lifting support rod (2) is mounted on the base (1), and the other end of the lifting support rod (2) is connected to the rotating disk (3). The rotating disk (3) can rotate around the axis of the lifting support rod (2). One end of the telescopic connecting rod (4) is mounted on the rotating disk (3), and the other end of the telescopic connecting rod (4) is connected to the cutting compensation assembly (7). The clamping assembly (8) is mounted on the cutting compensation assembly (7). The component (8) is used to clamp the first cutting component (5) and the second cutting component (6) in sequence. The cutting compensation component (7) is used to make the clamping component (8) tend to move away from the lifting support rod (2). The first cutting component (5) is initially cut at a preset cutting position on the inner wall of the large-diameter steel pipe pile, so that the wall thickness at the preset cutting position becomes thinner. The cutting compensation component (7) makes the first cutting component (5) always press against the inner wall of the steel pipe pile during the cutting process. The second cutting component (6) completely cuts the large-diameter steel pipe pile along the cutting trajectory of the first cutting component (5). The second cutting component (6) is used to randomly select cutting points at the cutting trajectory left by the first cutting component (5) to observe whether a large amount of water will flow back into the large-diameter steel pipe pile.

2. The internal cutting equipment for large-diameter steel pipe piles according to claim 1, characterized in that: The clamping assembly (8) includes a clamping block one (9) and a clamping block two (10). The clamping block one (9) and the clamping block two (10) are both installed on the cutting compensation assembly (7). The cutting compensation assembly (7) is also provided with a connecting part (11). The clamping block one (9) and the clamping block two (10) are both provided with clamping members (12). The two clamping members (12) pass through the clamping block one (9) and the clamping block two (10) respectively and are connected to the connecting part (11) by threaded engagement. The clamping block one (9) and the clamping block two (10) form a clamping space for clamping the cutting part one (5) and the cutting part two (6). The cutting part one (5) and the cutting part two (6) are both used to cut the inner wall of the large-diameter steel pipe pile.

3. The internal cutting equipment for large-diameter steel pipe piles according to claim 2, characterized in that: The cutting compensation assembly (7) includes a first fixing plate (13), a second fixing plate (14), two guide shafts (15), and two springs (16). The first fixing plate (13) and the second fixing plate (14) are parallel to each other. The first fixing plate (13) is installed at the end of the telescopic connecting rod (4) away from the rotating disk (3). The two guide shafts (15) are installed between the first fixing plate (13) and the second fixing plate (14). One end of the guide shaft (15) is connected to the second fixing plate (14). 5) The other end passes vertically through the first fixing plate (13) and slides with the first fixing plate (13). The first spring (16) is sleeved on the guide shaft (15). One end of the first spring (16) is connected to the first fixing plate (13), and the other end of the first spring (16) is connected to the second fixing plate (14). The first clamping block (9) and the second clamping block (10) are slidably connected to the side of the second fixing plate (14) away from the first fixing plate (13). The connecting part (11) is provided on the second fixing plate (14).

4. The internal cutting equipment for large-diameter steel pipe piles according to claim 3, characterized in that: Both guide shafts (15) are provided with limiting members (17) at one end of the fixed plate (13), and the limiting members (17) are connected to the guide shafts (15) by means of threaded engagement.

5. The internal cutting equipment for large-diameter steel pipe piles according to claim 3, characterized in that: Mounting seat 1 (18) is provided on the fixing plate 1 (13), and mounting seat 2 (19) is provided on the fixing plate 2 (14). A measuring rod (20) is provided between mounting seat 1 (18) and mounting seat 2 (19). One end of the measuring rod (20) passes through mounting seat 1 (18) and mounting seat 2 (19) in sequence and then abuts against the inner wall of the large-diameter steel pipe pile. A limiting part (21) is provided at the other end of the measuring rod (20). A scale line (22) for measuring the cutting depth of the cutting part 1 (5) is provided on the measuring rod (20). The value of the scale line (22) gradually increases from the direction close to the limiting part (21) to the direction away from the limiting part (21).

6. The internal cutting equipment for large-diameter steel pipe piles according to claim 5, characterized in that: A second spring (23) is fitted on the measuring rod (20). One end of the second spring (23) is connected to the mounting base (18), and the other end of the second spring (23) is connected to the limiting part (21).

7. The internal cutting equipment for large-diameter steel pipe piles according to claim 1, characterized in that: The lifting support rod (2) includes a first lifting rod (24) and a second lifting rod (25). One end of the first lifting rod (24) is mounted on the base (1), and the other end of the first lifting rod (24) passes through the second lifting rod (25). The end of the second lifting rod (25) away from the first lifting rod (24) is connected to the rotating disk (3). The rotating disk (3) can rotate around the axis of the second lifting rod (25) on the second lifting rod (25). The second lifting rod (25) and the first lifting rod (24) are connected by a threaded connection. A positioning nut (26) is sleeved on the first lifting rod (24).

8. The internal cutting equipment for large-diameter steel pipe piles according to claim 3, characterized in that: The telescopic connecting rod (4) includes a connecting rod one (27) and a connecting rod two (28). One end of the connecting rod one (27) is mounted on the rotating disk (3), and the other end of the connecting rod one (27) is sleeved on the connecting rod two (28). The end of the connecting rod two (28) away from the connecting rod one (27) is connected to the fixing plate one (13). The connecting rod two (28) and the connecting rod one (27) are in sliding cooperation.

9. A method for internal cutting of large-diameter steel pipe piles, employing the internal cutting equipment for large-diameter steel pipe piles as described in any one of claims 1-8, characterized in that: Includes the following steps: S100: Set the base (1) at the center of the large-diameter steel pipe pile, install the cutting part (5) between the clamping block (9) and the clamping block (10), and adjust the height of the cutting part (5) by the lifting support rod (2) so that the cutting part (5) is at the same height as the preset cutting position in the inner wall of the large-diameter steel pipe pile. Adjust the length of the telescopic connecting rod (4) so ​​that the cutting part (5) abuts against the inner wall of the steel pipe pile. S200: Drive the telescopic connecting rod (4) so ​​that the telescopic connecting rod (4) moves in a circle around the axis of the lifting support rod (2) inside the large-diameter steel pipe pile, and simultaneously start the cutting part (5). The cutting part (5) performs preliminary cutting at the preset cutting position on the inner wall of the large-diameter steel pipe pile. The cutting compensation component (7) ensures that the cutting part (5) is always pressed against the inner wall of the steel pipe pile during the cutting process. S300: After the steel pipe pile is suspended by the crane, the first cutting part (5) is replaced with the second cutting part (6). The second cutting part (6) completely cuts the large-diameter steel pipe pile along the cutting trajectory of the first cutting part (5). S400: The crane lifts and moves the cut large-diameter steel pipe pile away.

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