An inside cutting knife device and a construction method

Abstract

The application discloses an inner cutting knife device and a construction method, and belongs to the field of pipe pile construction, which comprises a drill rod, an inner supporting device, a connecting head and an inner cutting knife device; one end of the drill rod is connected with a drilling machine, the other end of the drill rod is fixedly connected with the inner cutting knife device through the connecting head, the inner supporting device is rotatably installed on the drill rod, and the inner supporting device can be abutted against the inner wall of a pipe pile to fix the whole device; the inner cutting knife device comprises a cylinder, a slide channel is arranged in the cylinder, a water passage is arranged in the drill rod, the slide channel is communicated with the water passage, a slide core is slidably arranged in the slide channel, a plurality of mounting grooves are arranged on the outer wall of the cylinder and communicated with the slide channel, a cutting blade is rotatably arranged in the mounting groove, and one end of the cutting blade is in transmission connection with the slide core.

Description

Technical Field

[0001] This invention relates to the field of pipe pile construction, and in particular to an internal cutting device and construction method. Background Technology

[0002] Pipe piles are commonly used in building construction to transfer the load of the superstructure to deeper, more robust soil layers, or to compact weak soil layers to improve the bearing capacity and density of the foundation soil. Therefore, it is essential to ensure the quality of pipe pile construction to improve the stability of the building.

[0003] Pipe piles are generally precast piles. In actual construction, the length of pipe piles is usually greater than the depth of the pipe pile driven into the ground layer, so the pipe piles need to be cut to the construction design height.

[0004] In traditional construction, excessively long pipe piles are cut by clearing the soil around the pile to the required horizontal elevation before cutting the pile from the outside. During the clearing process to the cutting surface, if construction machinery touches the pile, it can cause internal breakage. Cutting the pile from the outside requires the design of large-scale cutting machinery, making the construction process complex. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to propose an internal cutting device and construction method to cut the pipe pile from the inside of the pipe, thereby avoiding the pipe pile breakage and rework caused by the traditional pipe pile cutting process, and improving the efficiency and quality of pipe pile cutting construction.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This invention provides an internal cutting device, comprising a drill rod, an internal support device, a connector, and an internal cutting blade device. One end of the drill rod is connected to a drilling rig, and the other end of the drill rod is fixedly connected to the internal cutting blade device via the connector. The internal support device is rotatably mounted on the drill rod and can be pressed against the inner wall of the pipe pile to fix the entire device. The internal cutting blade device includes a cylinder with a slide rail inside. A water passage is provided inside the drill rod, and the slide rail is connected to the water passage. A sliding core is slidably mounted inside the slide rail, and one end of the sliding core near the drill rod is sealed against the inner wall of the slide rail. Several mounting grooves are provided on the outer wall of the cylinder, and the mounting grooves are connected to the slide rail. A cutting blade is rotatably mounted in the mounting groove, and one end of the cutting blade is drivenly connected to the sliding core.

[0008] A preferred embodiment of the present invention is that the slide rail includes a front cavity, a middle cavity, and a rear cavity; the slide core includes a push block and a slide rod; the push block is slidably installed in the front cavity, the slide rod is located in the middle cavity and the rear cavity, and the outer wall of the push block is in contact with the inner wall of the front cavity; a return spring is provided in the middle cavity, the return spring is sleeved on the slide rod, one end of the return spring abuts against one end of the push block, and the other end of the return spring abuts against one end of the middle cavity.

[0009] A preferred embodiment of the present invention is that the sliding core is further provided with a pressure relief channel, the top end of the pressure relief channel is connected to the front cavity, the bottom end of the pressure relief channel is provided with a drain hole, and the pressure relief channel is connected to the outside through the drain hole.

[0010] A preferred embodiment of the present invention is that the water outlet direction of the drain hole is inclined upward.

[0011] A preferred embodiment of the present invention is that the push block has a placement groove, the placement groove is embedded with a pressure boosting block, and the pressure boosting block has a conical pressure boosting hole.

[0012] A preferred embodiment of the present invention is that the slide bar surface has a first gear tooth arranged along the length of the slide bar at the mounting groove, and the cutting blade head has a second gear tooth that meshes with the first gear tooth.

[0013] A preferred embodiment of the present invention is that a front-end mounting head is provided at one end of the outer wall of the cylinder near the drill rod, one end of the front-end mounting head is threaded to the inner wall of the slide, the other end of the front-end mounting head is threaded to the connector, and a connecting channel penetrating both ends is provided inside the front-end mounting head.

[0014] A preferred embodiment of the present invention is that a filter plate is provided on the inner side of the connecting channel.

[0015] A preferred embodiment of the present invention is that the end of the cylinder away from the drill rod is provided with a rear end mounting head, and a drill bit is threadedly connected to the rear end mounting head.

[0016] The present invention provides a construction method for an internal cutting device, the steps of which are as follows:

[0017] S1. After the drill pipe, internal support device, connector and internal cutting tool device are assembled, connect the device to the drilling rig;

[0018] S2. The internal cutting device is placed into the pipe pile through the suspension device. During the placement process, the drilling rig rotates at low speed to lower the internal cutting device to the cutting point.

[0019] S3. Inject 0.5 MPa high-pressure water into the drill rod of the inner cutting device so that the inner support device is pressed against the inner wall of the pipe pile. The drilling rig continues to rotate at low speed until the drill rod runs stably.

[0020] S4. After the drill rod is running stably, adjust the high-pressure water to 1-2MPa to open the cutting blades of the internal cutting device, and increase the drilling speed to quickly cut the pipe pile.

[0021] S5. When the pressure gauge pressure suddenly drops or the water level inside the pipe pile suddenly drops, the pipe pile is cut off, the high-pressure water supply is cut off, the cutting blade is retracted, the internal support device is reset, and the internal cutting device is retracted.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. By installing an internal cutting device, the device is placed inside the pipe pile. High-pressure water is introduced into the drill rod, which pushes the sliding core, causing the cutting blades connected to the sliding core to unfold outward. The drilling rig is then started, driving the entire device to rotate and cut the pipe pile from the inside. Using internal pipe pile cutting allows for the removal of excess pipe pile before clearing to the design elevation, or the excess pipe pile can be cut first, cleared to the design elevation, and finally removed. This method prevents the transmission of impact force from construction machinery to the pipe pile at the break point if machinery comes into contact with it during construction, thus avoiding quality problems such as the breakage of the required pipe pile beneath the earthwork.

[0024] 2. By setting an internal support device, which rests against the inner wall of the pipe pile to be cut, the cantilever of the internal cutting device is shortened, thus improving the stability of the internal cutting device during the cutting process.

[0025] 3. By setting up a pressure relief channel, it is possible to prevent excessive pressure during the initial stage of pressure transformation after high-pressure water is introduced, which could cause impact damage to the cutting blades and other components.

[0026] 4. By setting up a drain hole, high-pressure water is sprayed out from the drain hole through the pressure relief channel, which can cool the cutting blade and also serve as drainage after the operation is completed.

[0027] 5. By setting a drill bit, obstacles that may hinder the downward movement of the device can be removed from inside the pipe pile during the insertion of the cutting device into the pipe pile. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal cutting device provided in a specific embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal cutting device when the cutting blade is not open;

[0030] Figure 3This is a schematic diagram of the internal cutting device when the cutting blade is open;

[0031] Figure 4 yes Figure 3 A magnified view of part A in the image;

[0032] Figure 5 yes Figure 2 A magnified view of part B in the image;

[0033] Figure 6 It is a flowchart of the construction method;

[0034] In the picture:

[0035] 1. Drill rod; 2. Internal support device; 3. Connector; 4. Internal cutting blade device; 5. Cylinder; 6. Slide rail; 7. Water passage; 8. Sliding core; 9. Mounting groove; 10. Cutting blade; 11. Front cavity; 12. Middle cavity; 13. Rear cavity; 14. Push block; 15. Slide rod; 16. Return spring; 17. Pressure relief channel; 18. Drain hole; 19. Placement groove; 20. Pressure boosting block; 21. Pressure boosting hole; 22. First gear tooth; 23. Second gear tooth; 24. Front mounting head; 25. Connecting channel; 26. Filter plate; 27. Rear mounting head; 28. Drill bit. Detailed Implementation

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] As shown in the figure, this invention provides an internal cutting device. It includes a drill rod 1, an internal support device 2, a connector 3, and an internal cutting blade device 4. The drill rod 1 is a steel pipe with male and female threads tapped at both ends. One end of the drill rod 1 is connected to a drilling machine, and the other end of the drill rod 1 is fixedly connected to the internal cutting blade device 4 via the connector 3. The internal support device 2 is rotatably mounted on the drill rod 1 and is driven by high-pressure water, allowing it to press against the inner wall of the pipe pile to fix the entire device, shortening the cantilever of the internal cutting blade device and improving the stability of the cutting process.

[0038] The internal cutting device 4 includes a cylinder 5, inside which is a slide 6. Inside the drill rod 1 is a water passage 7. The slide 6 is connected to the water passage 7. A sliding core 8 is slidably installed inside the slide 6. High-pressure water is injected from the water passage 7 of the drill rod 1 and enters the slide 6. The high-pressure water causes the sliding core 8 to move downward. The end of the sliding core 8 near the drill rod 1 is sealed against the inner wall of the slide 6 to ensure that the high-pressure water can push the sliding core 8 downward. Several mounting grooves 9 are provided on the outer wall of the cylinder 5. The mounting grooves 9 are connected to the slide 6. A cutting blade 10 is rotatably installed in the mounting groove 9. One end of the cutting blade 10 is connected to the sliding core 8. When the sliding core 8 moves downward, it will drive the cutting blade 10 located in the mounting groove 9 to unfold outward and perform internal cutting on the pipe pile.

[0039] The slide 6 includes a front cavity 11, a middle cavity 12, and a rear cavity 13, with the diameters of the front cavity 11, middle cavity 12, and rear cavity 13 decreasing sequentially. The slide core 8 includes a push block 14 and a slide rod 15. The push block 14 is slidably installed in the front cavity 11, and the outer wall of the push block 14 is in contact with the inner wall of the front cavity 11. A sealing ring is fitted on the push block 14 to improve the sealing performance of the front cavity 11. When high-pressure water is introduced, the high-pressure water acts on the push block 14, causing the slide core 8 to move downward. The step between the front cavity 11 and the middle cavity 12 limits the stroke of the push block 14, preventing excessive stroke of the push block 14 from causing impact damage to the slide core 8 and the cutting blade 10.

[0040] The slide rod 15 is located in the middle cavity 12 and the rear cavity 13. A return spring 16 is provided in the middle cavity 12. The return spring 16 is sleeved on the slide rod 15. One end of the return spring 16 abuts against one end of the push block 14, and the other end of the return spring 16 abuts against the end of the middle cavity 12 near the rear cavity 13. After high-pressure water is introduced, the pressure of the high-pressure water is greater than the elastic force of the return spring 16, causing the push block 14 to compress the spring. When the cutting is completed, the high-pressure water stops flowing in, and the slide core 8 resets under the force of the return spring 16, driving the cutting blade 10 to fold inward and retract into the mounting groove 9.

[0041] When high-pressure water is introduced, the high water pressure acts directly on the slide core 8, causing it to move rapidly downwards and the cutting blade 10 to unfold quickly. This makes the cutting blade 10 susceptible to impact and damage. Therefore, a pressure relief channel 17 is provided on the slide core 8. The top of the pressure relief channel 17 communicates with the front cavity 11, and the bottom of the pressure relief channel 17 has a drain hole 18, which connects the pressure relief channel 17 to the outside. When high-pressure water enters the slide rail 6, the pressure relief channel 17 buffers the impact force of the high-pressure water on the slide core 8, preventing damage from impact between the cutting blade 10 and the mounting groove 9. After cutting, the water in the slide rail 6 is discharged through the pressure relief channel 17 and the drain hole 18. The drain hole 18 is inclined upwards, with the outlet facing the cutting blade 10. During the cutting process, high-pressure water is also sprayed out through the pressure relief channel 17 and the drain hole 18, which cools the cutting blade 10.

[0042] Specifically, the push block 14 has a placement groove 19, in which a pressure boosting block 20 is embedded. The pressure boosting block 20 has a conical pressure boosting hole 21. When high-pressure water enters the front end of the push block 14, the high-pressure water enters the pressure relief channel 17 through the conical pressure boosting hole 21, and then exits from the drain hole 18. Since the diameter of the conical pressure boosting hole 21 gradually decreases, it plays a buffering role while also increasing the pressure in the pressure relief channel 17, making the pressure at the drain hole 18 higher than the outside pressure, thereby achieving the spraying effect.

[0043] The slide bar 15 has a first tooth 22 arranged along its length at the mounting groove 9 on its surface, and the cutting blade 10 has a second tooth 23 on its head that meshes with the first tooth 22. Through the cooperation of the first tooth 22 and the second tooth 23, the cutting blade 10 is driven to unfold or retract when the slide core 8 slides.

[0044] To facilitate the disassembly and maintenance of the sliding core 8, a front end mounting head 24 is provided on the outer wall of the cylinder 5 near the drill rod 1. One end of the front end mounting head 24 is threaded to the inner wall of the slide 6, and the other end of the front end mounting head 24 is threaded to the connector 3. A connecting channel 25 penetrating both ends is opened inside the front end mounting head 24.

[0045] When high-pressure water is introduced from the outside, it contains large solid particles that can clog the pressure relief channel 17 and the drain hole 18. Therefore, a filter plate 26 is provided inside the connecting channel 25 to filter out large solid particles. After a large amount of solid particles accumulate on the filter plate 26, the impurities on the filter screen can be removed by removing the front mounting head 24.

[0046] The end of the cylinder 5 away from the drill rod 1 is provided with a rear end mounting head 27, and a drill bit 28 is threadedly connected to the rear end mounting head 27. During the process of inserting the internal cutting device 4 into the pipe pile, obstacles that may hinder the downward movement of the device due to protrusions inside the pipe pile can be removed.

[0047] like Figure 6 A construction method for an internal cutting device, comprising the following steps:

[0048] After assembling S1, drill rod 1, internal support device 2, connector 3 and internal cutting tool device 4, connect the device to the drilling rig;

[0049] S2. The inner cutting device is placed into the pipe pile through the suspension device. During the placement process, the drilling rig rotates at low speed, causing the drill bit to rotate. The drill bit removes any obstacles that may hinder the device from going down and extending inside the pipe pile. The inner cutting device is then lowered to the cutting point.

[0050] S3. Inject 0.5 MPa of high-pressure water into the drill rod 1 of the inner cutting device so that the inner support device 2 is pressed against the inner wall of the pipe pile. The drilling machine continues to rotate at low speed until the drill rod 1 is stable. At this time, the high-pressure water cannot completely open the cutting blade 10, and the cutting blade 10 does not contact the inner wall of the pipe pile.

[0051] S4. After the drill rod 1 is running stably, adjust the high pressure water to 1-2MPa. The high pressure water pushes the sliding core 8, causing the cutting blade 10 of the inner cutting blade device 4 to open. The cutting blade 10 is pressed against the inner wall of the pipe pile, and the drilling speed is increased to quickly cut the pipe pile. As the cutting blade 10 slowly cuts into the pipe pile, the cutting blade 10 slowly opens completely.

[0052] S5. When the pressure of the water pressure gauge suddenly drops or the water level in the inner cavity of the pipe pile suddenly drops, the cutting blade is fully opened, the pipe pile is cut off, the high-pressure water supply is cut off, the cutting blade 10 is retracted, the inner support device 2 is reset, and the inner cutting blade device is retracted.

[0053] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. An internal cutting device, characterized in that: It includes a drill rod (1), an internal support device (2), a connector (3), and an internal cutting tool device (4); One end of the drill rod (1) is connected to the drilling machine, and the other end of the drill rod (1) is fixedly connected to the inner cutting knife device (4) through the connector (3). The inner support device (2) is rotatably installed on the drill rod (1). The inner support device (2) can be pressed against the inner wall of the pipe pile to fix the entire device. The internal cutting tool device (4) includes a cylinder (5), a slide (6) is provided inside the cylinder (5), a water passage (7) is provided inside the drill rod (1), the slide (6) is connected to the water passage (7), a sliding core (8) is slidably provided inside the slide (6), and one end of the sliding core (8) near the drill rod (1) is sealed and fitted to the inner wall of the slide (6); The outer wall of the cylinder (5) is provided with several mounting grooves (9), the mounting grooves (9) are connected to the slide (6), and a cutting blade (10) is rotatably installed in the mounting groove (9). One end of the cutting blade (10) is connected to the slide core (8). The slide (6) includes a front cavity (11), a middle cavity (12) and a rear cavity (13); The slide core (8) includes a push block (14) and a slide rod (15). The push block (14) is slidably installed in the front cavity (11), the slide rod (15) is located in the middle cavity (12) and the rear cavity (13), and the outer wall of the push block (14) is in contact with the inner wall of the front cavity (11); A reset spring (16) is provided in the cavity (12). The reset spring (16) is sleeved on the slide rod (15). One end of the reset spring (16) abuts against one end of the push block (14), and the other end of the reset spring (16) abuts against one end of the cavity (12). The sliding core (8) is also provided with a pressure relief channel (17), the top end of the pressure relief channel (17) is connected to the front cavity (11), and the bottom end of the pressure relief channel (17) is provided with a drain hole (18), and the pressure relief channel (17) is connected to the outside through the drain hole (18); The outlet hole (18) is inclined upward; The push block (14) has a placement groove (19), and a pressure boosting block (20) is embedded in the placement groove (19). The pressure boosting block (20) has a conical pressure boosting hole (21). The outer wall of the cylinder (5) is provided with a front end mounting head (24) near the drill rod (1). One end of the front end mounting head (24) is threaded to the inner wall of the slide (6), and the other end of the front end mounting head (24) is threaded to the connector (3). A connecting channel (25) is provided inside the front end mounting head (24) that passes through both ends. A filter plate (26) is provided on the inner side of the connecting channel (25).

2. The internal cutting device according to claim 1, characterized in that: The slide bar (15) has a first tooth (22) arranged along the length of the slide bar (15) at the mounting groove (9), and the cutting blade (10) has a second tooth (23) that meshes with the first tooth (22) on its head.

3. The internal cutting device according to claim 1, characterized in that: The cylinder (5) is provided with a rear end mounting head (27) at the end away from the drill rod (1), and a drill bit (28) is threaded onto the rear end mounting head (27).

4. A construction method using the internal cutting device according to any one of claims 1 to 3, characterized in that: The steps are as follows: After S1, drill rod (1), internal support device (2), connector (3) and internal cutting tool device (4) are assembled, connect the device to the drilling rig; S2. The internal cutting device is placed into the pipe pile through the suspension device. During the placement process, the drilling rig rotates at low speed to lower the internal cutting device to the cutting point. S3. Inject 0.5MPa high-pressure water into the drill rod (1) of the inner cutting device so that the inner support device (2) is pressed against the inner wall of the pipe pile. The drilling machine continues to rotate at low speed until the drill rod (1) is stable. S4. After the drill rod (1) is running stably, adjust the high pressure water to 1-2MPa to open the cutting blade (10) of the internal cutting blade device (4) and increase the drilling speed to quickly cut the pipe pile. S5. When the pressure of the water pressure gauge suddenly drops or the water level in the inner cavity of the pipe pile suddenly drops, the pipe pile is cut off, the high-pressure water supply is cut off, the cutting blade (10) is retracted, the inner support device (2) is reset, and the inner cutting device is retracted.

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