A bored pile pile head ring cutting device and a method of using the same

Abstract

The application discloses a bored pile head ring cutting equipment and a using method thereof, and belongs to the technical field of civil engineering cutting equipment. The equipment comprises a base, a lifting assembly, a positioning assembly and a cutting assembly. The lifting assembly is fixed above the base. The positioning assembly comprises a counter track which is connected with the lifting assembly. A positioning ring is arranged on the counter track. A driving motor and a rotating module capable of rotating around the center axis of the positioning ring are arranged on the positioning ring. The cutting assembly is fixedly arranged on the rotating module. The driving gear drives the rotating module to rotate around the positioning ring. The application has the effects of reducing the self-weight of the cutting assembly and reducing cutting interference.

Description

Technical Field

[0001] This invention relates to the field of civil engineering cutting equipment technology, and more specifically, to a drilling and grouting pile head circumferential cutting device and its usage method. Background Technology

[0002] Drilled cast-in-place piles are piles constructed by creating a hole in the foundation soil using mechanical drilling, steel pipe extrusion, or manual excavation, placing a reinforcing cage inside, and then pouring concrete. They are widely used in the foundations of highways, railway bridges, and high-rise buildings. After construction, a section of the drilled cast-in-place pile always needs to be cut and removed. Forcibly cutting and hammering this pile would severely damage the reinforcing steel and cause vibrations, leading to a decrease in the overall structural quality of the pile. Therefore, it is necessary to first perform two circumferential cuts on the drilled cast-in-place pile, with the cut depth just reaching the reinforcing steel layer. Then, the concrete between the two cuts is removed to form an isolation zone between the pile body and the pile head. Finally, the pile head is removed to minimize the impact on the pile body.

[0003] In the prior art, bored pile circumferential cutting equipment comes in various forms. For example, a bridge engineering bored pile head circumferential cutting device with utility model application number 202422488666.8 includes a guide rail mechanism, a fixing mechanism, a traveling mechanism, a distance adjustment mechanism, a cutting mechanism, etc., which is a typical bored pile head circumferential cutting equipment. For example, the invention patent with application number 202210941805.0 describes a cutting hoop for the overall breaking of the pile head of a bored cast-in-place pile. It includes a support frame, a lifting mechanism, a circumferential cutting mechanism, a limiting mechanism, a crushing mechanism, and a moving mechanism. The lower end of the support frame has a lifting mechanism, which includes an installation frame mounted above a base plate. The installation frame moves along the axial direction of the bored cast-in-place pile via adjusting components one and two. A moving mechanism is located below the base plate. The installation frame has a circumferential cutting mechanism for cutting the pile head. A limiting mechanism is located below the installation frame, including multiple limiting components to ensure that the installation frame and the bored cast-in-place pile are coaxial. The support frame and the crushing mechanism are fixedly connected to remove the concrete around the reinforcing steel. This invention utilizes the lifting mechanism to adjust the circumferential cutting position, circumferentially cuts the concrete outside the reinforcing steel, crushes the concrete around the reinforcing steel, and finally lifts the pile head located inside the reinforcing steel using a crane. It features a high degree of automation. However, all existing bored pile circumferential cutting equipment has a shortcoming: the cutting component, as an important working part, is not only heavy but also easily interfered with by other components, resulting in unsatisfactory cutting effect. Summary of the Invention

[0004] 1. The technical problem that the invention aims to solve

[0005] In view of the problems that the cutting components of existing bored pile circumferential cutting equipment are heavy and easily interfered with by other components, resulting in unsatisfactory cutting effects, this invention provides a bored pile head circumferential cutting equipment and its usage method, which can reduce the weight of the cutting components and reduce cutting interference.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0008] A bored pile head circumferential cutting device includes a base, a lifting assembly, a positioning assembly, and a cutting assembly. The lifting assembly is fixed above the base, and the positioning assembly includes an opposing rail connected to the lifting assembly.

[0009] A positioning ring is provided on the opposing track. A drive motor and a rotating module capable of rotating around the central axis of the positioning ring are provided on the positioning ring. The cutting component is fixedly mounted on the rotating module. The drive motor drives the rotating module to rotate around the positioning ring.

[0010] Preferably, the opposing track is further provided with an opposing groove, and a bidirectional lead screw is provided in the opposing groove. A bidirectional motor is provided at one end of the bidirectional lead screw to drive the bidirectional lead screw to rotate.

[0011] The positioning ring includes two semi-circular blocks, which are connected to the bidirectional lead screw via moving rods. One semi-circular block is connected to the positive thread portion of the bidirectional lead screw via a moving rod, and the other semi-circular block is connected to the negative thread portion of the bidirectional lead screw via another moving rod, so that the two semi-circular blocks can be engaged or disengaged when the bidirectional lead screw rotates.

[0012] The lower end of the positioning ring is provided with a male sliding interface with an L-shaped cross section. The rotating module includes two semi-rotating blocks with identical structures on the left and right sides. The inner side of the semi-rotating block is provided with a female sliding interface corresponding to the male sliding interface. The male sliding interface and the female sliding interface cooperate to enable the rotating module to rotate coaxially relative to the positioning ring. The outer side of the semi-rotating block is provided with gear teeth.

[0013] The output end of the drive motor is provided with a drive gear, which meshes with the rotating module through gear teeth to drive the rotating module to rotate around the positioning ring.

[0014] Preferably, it also includes a clearance component; the opposing track is connected to the lifting component via the clearance component;

[0015] The obstacle avoidance assembly includes a horizontal track, rectangular sleeves, and a hollow rectangular rod. The horizontal track has a horizontal groove on one side along its length, and a lifting block is fixedly mounted on the other side. Two horizontal blocks capable of sliding along the horizontal groove are disposed within the horizontal groove and are fixedly connected by a columnar guide rod. A return spring is provided between the ends of the two horizontal blocks and the inner wall of the end of the horizontal groove. Two rectangular sleeves are provided, each fixedly connected to one of the two horizontal blocks. A cavity is provided at the end of the rectangular sleeve furthest from the horizontal block. One end of the hollow rectangular rod is disposed within the cavity, and a return damping rod is provided within the cavity, allowing the hollow rectangular rod to extend and retract within the cavity.

[0016] The lifting assembly includes a vertical guide rail, and the lifting block is slidably connected to the vertical guide rail; the hollow rectangular rod is fixedly connected to the opposite rail.

[0017] A centering module is provided on the positioning ring. The centering module includes several positioning hydraulic cylinders that are radially inserted into the positioning ring. The output end of the positioning hydraulic cylinder faces the center of the positioning ring and is provided with a U-shaped block. An auxiliary wheel is provided on the U-shaped block, and the central axis of the auxiliary wheel is parallel to the central axis of the positioning ring.

[0018] Preferably, the lifting assembly includes a lifting motor 306, a vertical groove, and a vertical screw. The vertical guide rail is disposed in the vertical groove, and the vertical screw is disposed along the direction of the vertical guide rail. The lifting motor is connected to the vertical screw to drive the vertical screw to rotate.

[0019] The lifting block is provided with a vertical screw hole, and the lifting block is sleeved on the vertical screw rod through the vertical screw hole. When the vertical screw rod rotates, it can drive the lifting block to move along the vertical guide rail.

[0020] Preferably, the vertical groove, vertical screw, and vertical guide rail are arranged in pairs, and the lifting motor is a dual-axis motor, which is set between the two vertical screws. The two output shafts of the dual-axis motor extend in opposite directions and are respectively connected to the vertical screw on the corresponding side through a worm gear structure.

[0021] Preferably, a reinforcing plate and a motor fixing plate are provided between the two vertical guide rails, and the lifting motor is fixed on the motor fixing plate.

[0022] Preferably, the cutting assembly includes a feed rail, a feed block, and a feed plate.

[0023] The cutting assembly is fixedly mounted on the rotating module via a feed rail; the feed rail is provided with a feed groove, a feed screw is provided in the feed groove, the feed block is provided with a screw hole, and is sleeved on the feed screw through the screw hole; a feed motor is provided at one end of the feed screw, so that the feed motor drives the feed screw to rotate, thereby driving the feed block to move along the feed groove;

[0024] The feed block is fixedly connected to the feed plate, and the feed plate is provided with a cutting motor and a cutting saw blade. The cutting motor drives the cutting saw blade to rotate.

[0025] Preferably, the feed plate is further provided with a motor frame and a cutting shaft. The cutting motor is fixed on the motor frame, and the cutting shaft is fixed on the feed plate by bearings. One end of the shaft is fixedly connected to the cutting saw blade, and the other end is driven to the output end of the cutting motor through a belt drive mechanism.

[0026] A method for using a drilled pile head circumferential cutting device includes the following steps.

[0027] S1. Move the equipment to the location of the bored pile to be circumcised, start the lifting assembly, and adjust the height of the positioning assembly to meet the circumcised position requirements;

[0028] S2. Start the bidirectional motor to separate and open the left and right semi-circular blocks. Move the equipment to place the bored pile inside the positioning ring. Start the bidirectional motor again to gradually combine the left and right semi-circular blocks and bring them close to the bored pile. Stop the bidirectional motor.

[0029] S3. Adjust the central axis of the equipment positioning ring to make it coincide with the central axis of the bored pile, and start the bidirectional motor again to make the positioning ring clamp the bored pile.

[0030] S4. Adjust the cutting components to prepare for cutting the bored pile;

[0031] S5. Start the drive motor to drive the rotating module to rotate around the positioning ring. At the same time, the cutting component advances and cuts as the rotating module rotates. The drive motor is fixed on the positioning ring and does not rotate with the rotating module, so as to realize the separation of the movement of the drive motor and the cutting component, and realize the circumferential cutting of the bored pile.

[0032] Preferably, in step S3, the aforementioned avoidance component and centering module are used to make the central axis of the positioning ring coincide with the central axis of the bored pile.

[0033] 3. Beneficial effects

[0034] Compared with the prior art, the technical solution provided by this invention has the following beneficial effects:

[0035] This invention features a positioning ring with a drive motor and a rotation module mounted on it. The cutting component is fixedly mounted to the rotation module. The drive motor rotates the rotation module, which in turn indirectly rotates the cutting component. This separates the cutting component from the drive device, reduces the weight of the cutting component, and minimizes interference from the drive motor, thereby stabilizing the output cutting capacity.

[0036] The positioning ring of this invention is configured as a clamping structure comprising two semi-circular blocks on the left and right sides, which can quickly and accurately position the bored pile to be cut. Compared with the existing technology that uses hoisting tools, it is safer and more efficient. At the same time, this invention sets a male and female sliding interface at the lower end of the positioning ring, which overcomes the difficulties in combining the technology of separating the cutting component and the driving device and the positioning ring clamping technology. This allows the invention to achieve stable cutting output while also quickly positioning the bored pile to be cut.

[0037] The present invention includes an avoidance component and a centering module, which together can achieve a more accurate positioning of the central axis of the bored pile to be cut; in addition, the structure of the centering module also enables the present invention to be adapted to bored piles of different diameters.

[0038] The lifting component provided in this invention can precisely control the height of the positioning ring, thereby improving the accuracy of the ring cutting height position.

[0039] The cutting assembly of the present invention has a simpler structure and reduced weight due to the separation of the rotary drive device. It can output cutting power with a single and pure output, eliminate interference, and improve accuracy and efficiency.

[0040] The method of the present invention enables the cutting component and the driving device to move separately, reducing the vibration interference of the cutting component and improving the cutting accuracy; at the same time, it can quickly and accurately position the bored pile to be cut. Attached Figure Description

[0041] The dimensions and scales in the accompanying drawings do not represent the dimensions and scales of the actual product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0042] Figure 1 An overall schematic diagram of the present invention is shown;

[0043] Figure 2 This diagram shows another perspective view of the overall invention;

[0044] Figure 3 A diagram showing the connection relationship between the avoidance component and the positioning component of the present invention is provided.

[0045] Figure 4 A schematic diagram of the avoidance component of the present invention is shown;

[0046] Figure 5 A schematic diagram of the positioning component of the present invention is shown;

[0047] Figure 6 A schematic diagram of the positioning ring and centering module in the positioning assembly of the present invention is shown;

[0048] Figure 7 A schematic diagram of the rotation module in the positioning component of the present invention is shown;

[0049] Figure 8 A schematic diagram of the lifting component of the present invention is shown;

[0050] Figure 9 A schematic diagram of the cutting assembly of the present invention is shown;

[0051] Explanation of reference numerals in the attached figures:

[0052] 100. Base;

[0053] 200. Casters;

[0054] 300. Lifting assembly; 301. Vertical guide rail; 302. Vertical groove; 303. Vertical screw; 304. Reinforcing plate; 305. Motor mounting plate; 306. Lifting motor;

[0055] 400. Avoidance assembly; 401. Lifting block; 402. Horizontal track; 403. Horizontal groove; 404. Columnar guide rod; 405. Horizontal block; 406. Return spring; 407. Rectangular sleeve; 408. Hollow rectangular rod; 409. Return damping rod;

[0056] 500. Positioning component; 501. Opposing rail; 502. Opposing groove; 503. Bidirectional lead screw; 504. Bidirectional motor; 505. Flat plate; 506. Drive motor; 507. Drive gear; 508. Moving rod; 509. Semi-arc block; 510. Positioning hydraulic cylinder; 511. U-shaped block; 512. Auxiliary wheel; 513. Male sliding interface; 514. Gear tooth; 515. Semi-rotating block;

[0057] 600. Cutting assembly; 601. Feed rail; 602. Feed groove; 603. Feed screw; 604. Feed motor; 605. Feed block; 606. Feed plate; 607. Cutting shaft; 608. Cutting saw blade; 609. Motor frame; 610. Cutting motor. Detailed Implementation

[0058] The present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments of the invention; those skilled in the art can conceive of other ways to implement the invention based on these preferred embodiments, and such other ways also fall within the scope of the invention.

[0059] Example 1

[0060] like Figure 1 and Figure 2 As shown, a bored pile head circumferential cutting device includes a base 100, a lifting component 300, a positioning component 500, and a cutting component 600. The lifting component 300 is fixed above the base 100, and the base 100 is provided with four casters 200.

[0061] like Figure 3 As shown, the positioning component 500 includes an opposing track 501, which is connected to the lifting component 300 via an avoidance component 400. In this embodiment, the opposing track 501 and the lifting component 300 can also be connected.

[0062] like Figure 5 and Figure 6 As shown, a positioning ring is set on the opposing track 501, and a rotating module that can rotate around the central axis of the positioning ring is set on the positioning ring. The cutting component 600 is fixedly set on the rotating module.

[0063] The opposing track 501 is also provided with an opposing groove 502, and a bidirectional lead screw 503 is provided in the opposing groove 502. A bidirectional motor 504 is provided at one end of the bidirectional lead screw 503 to drive the bidirectional lead screw 503 to rotate.

[0064] The positioning ring includes two semi-circular blocks 509 on the left and right. The two semi-circular blocks 509 are respectively connected to the bidirectional lead screw 503 via a moving rod 508. One semi-circular block 509 is connected to the positive thread part of the bidirectional lead screw 503 via a moving rod 508, and the other semi-circular block 509 is connected to the negative thread part of the bidirectional lead screw 503 via another moving rod 508, so that the two semi-circular blocks 509 can be engaged and disengaged when the bidirectional lead screw 503 rotates.

[0065] The lower end of the positioning ring is provided with a male sliding interface 513 with an L-shaped cross section. The rotating module includes two identical semi-rotating blocks 515 on the left and right sides. The inner side of the semi-rotating block 515 is provided with a female sliding interface corresponding to the male sliding interface 513. The male sliding interface 513 and the female sliding interface cooperate to realize the rotating module rotating coaxially relative to the positioning ring. Gear teeth 514 are provided on the outer side of the semi-rotating block.

[0066] A drive motor 506 is also fixedly mounted on the positioning ring. In this embodiment, the drive motor 506 is further supported by a flat plate 505 fixedly mounted on the positioning ring. A drive gear 507 is provided at the output end of the drive motor 506. The drive gear 507 meshes with the rotating module through gear teeth 514 to drive the rotating module to rotate around the positioning ring.

[0067] Existing technologies typically involve a self-driven cutting assembly rotating around a drilled pile. This requires the cutting assembly to have its own rotary motor, increasing its weight and negatively impacting its primary function—cutting—through vibration. This invention separates the power component driving the cutting assembly's rotation from the cutting assembly itself, reducing its weight and minimizing interference from factors like drive device vibration. Furthermore, this invention designs the rotating module as a split structure. This solves the assembly problem between the rotating module and the positioning ring: conventional rotating modules require a slewing bearing or similar rotating structure to assemble the positioning ring, but this structure cannot achieve clamping functionality and cannot be integrated with clamping technology. The split structure of this invention addresses both rotation and assembly issues, achieving a combination of the rotating module and the positioning component. It also solves the problem of how to integrate with the split positioning ring, effectively combining clamping and positioning functions with the separate driving technology of the cutting assembly.

[0068] Example 2

[0069] A bored pile head circumferential cutting device, based on Embodiment 1, specifically describes the implementation structure of the avoidance component 400 as follows:

[0070] The obstacle avoidance assembly 400 includes a horizontal track 402, a rectangular sleeve 407, and a hollow rectangular rod 408. The horizontal track 402 has a horizontal groove 403 on one side along its length and a lifting block 401 fixedly installed on the other side. Two horizontal blocks 405 that can slide along the horizontal groove 403 are installed in the horizontal groove 403. The two horizontal blocks 405 are fixedly connected to each other by a columnar guide rod 404. A return spring 406 is installed between the end of each of the two horizontal blocks 405 and the inner wall of the end of the horizontal groove 403. There are two rectangular sleeves 407, which are fixedly connected to the two horizontal blocks 405 respectively. A cavity is provided at the end of the rectangular sleeve 407 away from the horizontal block 405. One end of the hollow rectangular rod 408 is located in the cavity, and a return damping rod 409 is installed in the cavity, so that the hollow rectangular rod 408 can move telescopically within the cavity.

[0071] The lifting assembly 300 includes a vertical guide rail 301, a lifting block 401 slidably connected to the vertical guide rail 301, and a hollow rectangular rod 408 fixedly connected to the opposite rail 501.

[0072] A centering module is provided on the positioning ring. The centering module includes four positioning hydraulic cylinders 510 that are radially inserted into the positioning ring. The output end of the positioning hydraulic cylinder 510 faces the center of the positioning ring and is provided with a U-shaped block 511. An auxiliary wheel 512 is provided on the U-shaped block 511. The central axis of the auxiliary wheel 512 is parallel to the central axis of the positioning ring.

[0073] This embodiment can center the positioning ring and the bored pile to be cut without moving the main body of the bored pile head circumferential cutting equipment. The operation and structure are simpler. Especially in the complex and harsh working conditions of engineering construction, without moving the main body of the equipment, the centering can be completed by using the correction function of the equipment itself, which can greatly reduce safety hazards and improve production efficiency.

[0074] Example 3

[0075] A bored pile head circumferential cutting device, based on embodiment 2, specifically describes the implementation structure of the lifting component 300 as follows: The lifting component 300 includes a lifting motor 306, a vertical groove 302 and a vertical screw 303. A vertical guide rail 301 is arranged in the vertical groove 302, and the vertical screw 303 is arranged along the direction of the vertical guide rail 301. The lifting motor 306 is connected to the vertical screw 303 to drive the vertical screw 303 to rotate.

[0076] The lifting block 401 is provided with a vertical screw hole. The lifting block 401 is sleeved on the vertical screw rod 303 through the vertical screw hole. When the vertical screw rod 303 rotates, it can drive the lifting block 401 to move along the vertical guide rail 301.

[0077] The vertical groove 302, vertical screw 303 and vertical guide rail 301 are arranged in pairs. The lifting motor 306 is a dual-axis motor, which is set between the two vertical screws 303. The two output shafts of the dual-axis motor extend in opposite directions and are respectively connected to the vertical screw 303 on the corresponding side through a worm gear structure.

[0078] A reinforcing plate 304 and a motor fixing plate 305 are provided between the two vertical guide rails 301, and the lifting motor 306 is fixed on the motor fixing plate 305.

[0079] The lifting assembly in this embodiment has a simple structure and precise transmission. Combined with the structures of Embodiments 1 and 2, it can provide a drilling and grouting pile head circumferential cutting device with fast action and precise positioning.

[0080] Example 4

[0081] A bored pile head circumferential cutting device, based on Embodiment 3, specifically describes the implementation structure of the cutting component 600 as follows:

[0082] The cutting assembly 600 includes a feed rail 601, a feed block 605, and a feed plate 606. The cutting assembly 600 is fixedly mounted on the rotary module via the feed rail 601. The feed rail 601 is provided with a feed groove 602, and a feed screw 603 is provided in the feed groove 602. The feed block 605 is provided with a screw hole and is sleeved on the feed screw 603 through the screw hole. A feed motor 604 is provided at one end of the feed screw 603 so that the feed motor 604 drives the feed screw 603 to rotate, thereby driving the feed block 605 to move along the feed groove 602.

[0083] The feed block 605 is fixedly connected to the feed plate 606. The feed plate 606 is equipped with a cutting motor 610 and a cutting saw blade 608. The cutting motor 610 drives the cutting saw blade 608 to rotate.

[0084] The feed plate 606 is also equipped with a motor frame 609 and a cutting shaft 607. The cutting motor 610 is fixed on the motor frame 609, and the cutting shaft 607 is fixed on the feed plate 606 by bearings. One end of the shaft is fixedly connected to the cutting saw blade 608, and the other end is connected to the output end of the cutting motor 610 through a belt drive mechanism.

[0085] The cutting assembly in this embodiment does not require a self-driving motor or other driving equipment, which reduces its weight and minimizes interference from factors such as vibration of the driving device.

[0086] Example 5

[0087] A method for using a borehole pile head circumferential cutting device, specifically for the device in Example 4, includes the following steps.

[0088] S1. Move the equipment to the location of the bored pile to be circumcised, start the lifting assembly 300, and adjust the height of the positioning assembly 500 to meet the circumcised position requirements;

[0089] S2. Start the bidirectional motor 504 to separate and open the two semi-circular blocks 509. Move the equipment to place the bored pile inside the positioning ring. Start the bidirectional motor 504 again to gradually combine the two semi-circular blocks 509 and bring them close to the bored pile. Stop the bidirectional motor 504.

[0090] S3. Adjust the central axis of the equipment positioning ring to make it coincide with the central axis of the bored pile, and start the bidirectional motor 504 again to make the positioning ring clamp the bored pile.

[0091] In this embodiment, S3 uses the cooperation of the centering module and the avoidance component 400 to adjust the central axis of the equipment positioning ring so that it coincides with the central axis of the bored pile. The specific method is as follows:

[0092] The four positioning hydraulic cylinders 510 on the centering module are activated synchronously to push the auxiliary wheel 512 to fit against the outer face of the bored pile to be circumcised. If there is eccentricity during the fitting process, the auxiliary wheel 512 that fits against the outer face first will be resisted and react on the positioning ring, so that the positioning ring is moved by the buffer effect of the avoidance component 400 until it coincides with the central axis of the bored pile to be circumcised and stops and clamps the bored pile to be circumcised.

[0093] S4. Adjust the cutting assembly 600 to prepare for cutting the bored pile;

[0094] S5. Start the drive motor 506 to drive the rotating module to rotate around the positioning ring. At the same time, the cutting component 600 advances and rotates with the rotating module to cut. At this time, the drive motor (506) is fixed on the positioning ring and does not rotate with the rotating module. The cutting component 600 rotates and the two move separately to realize the circumferential cutting of the bored pile.

[0095] The method of this embodiment enables rapid alignment and centering between the circumferential cutting equipment and the bored pile to be cut; at the same time, the cutting component and the driving component move separately, reducing the load on the cutting component, reducing interference with the cutting component, and improving the efficiency and accuracy of cutting.

Claims

1. A circumferential cutting device for bored pile heads, comprising a base (100), a lifting assembly (300), a positioning assembly (500), and a cutting assembly (600), wherein the lifting assembly (300) is fixed above the base (100), characterized in that, The positioning component (500) includes an opposing rail (501) connected to the lifting component (300); A positioning ring is provided on the opposing track (501). A drive motor (506) and a rotating module capable of rotating around the central axis of the positioning ring are provided on the positioning ring. The cutting component (600) is fixedly mounted on the rotating module. The drive motor (506) drives the rotating module to rotate around the positioning ring.

2. The equipment for circumferential cutting of bored pile heads according to claim 1, characterized in that, The opposing track (501) is also provided with an opposing groove (502), and a bidirectional lead screw (503) is provided in the opposing groove (502). A bidirectional motor (504) is provided at one end of the bidirectional lead screw (503) to drive the bidirectional lead screw (503) to rotate. The positioning ring includes two semi-circular blocks (509) on the left and right sides. The two semi-circular blocks (509) are respectively connected to the bidirectional lead screw (503) through a moving rod (508). One semi-circular block (509) is connected to the positive thread part of the bidirectional lead screw (503) through a moving rod (508), and the other semi-circular block (509) is connected to the negative thread part of the bidirectional lead screw (503) through another moving rod (508), so that the two semi-circular blocks (509) on the left and right sides can be engaged and disengaged when the bidirectional lead screw (503) rotates. The lower end of the positioning ring is provided with a male sliding interface (513) with an L-shaped cross section. The rotating module includes two semi-rotating blocks (515) with identical structures on the left and right sides. The inner side of the semi-rotating block (515) is provided with a female sliding interface corresponding to the male sliding interface (513). The male sliding interface (513) and the female sliding interface cooperate to realize the rotating module rotating coaxially with the positioning ring. The outer side of the semi-rotating block is provided with gear teeth (514). The output end of the drive motor (506) is provided with a drive gear (507), which meshes with the rotating module through gear teeth (514) to drive the rotating module to rotate around the positioning ring.

3. A drilling pile head circumferential cutting device according to claim 1 or 2, characterized in that, It also includes a clearance assembly (400); the opposing track (501) is connected to the lifting assembly (300) via the clearance assembly (400); The avoidance assembly (400) includes a horizontal track (402), a rectangular sleeve (407), and a hollow rectangular rod (408). The horizontal track (402) has a horizontal groove (403) on one side along its length, and a lifting block (401) is fixedly installed on the other side. Two horizontal blocks (405) that can slide along the horizontal groove (403) are installed inside the horizontal groove (403). The two horizontal blocks (405) are fixedly connected by a columnar guide rod (404). A return spring (406) is provided between the end of the horizontal block (405) and the inner wall of the end of the horizontal groove (403); there are two rectangular sleeves (407), which are fixedly connected to two horizontal blocks (405) respectively. A cavity is provided at the end of the rectangular sleeve (407) away from the horizontal block (405). One end of the hollow rectangular rod (408) is provided in the cavity, and a return damping rod (409) is provided in the cavity so that the hollow rectangular rod (408) can move telescopically in the cavity; The lifting assembly (300) includes a vertical guide rail (301), and the lifting block (401) is slidably connected to the vertical guide rail (301); the hollow rectangular rod (408) is fixedly connected to the opposing rail (501); A centering module is provided on the positioning ring. The centering module includes several positioning hydraulic cylinders (510) that are radially inserted on the positioning ring. The output end of the positioning hydraulic cylinder (510) faces the center of the positioning ring and is provided with a U-shaped block (511) at the output end. An auxiliary wheel (512) is provided on the U-shaped block (511). The central axis of the auxiliary wheel (512) is parallel to the central axis of the positioning ring.

4. The bored pile head circumferential cutting device according to claim 3, characterized in that, The lifting assembly (300) includes a lifting motor (306), a vertical groove (302), and a vertical screw (303). The vertical guide rail (301) is disposed in the vertical groove (302), and the vertical screw (303) is disposed along the direction of the vertical guide rail (301). The lifting motor (306) is connected to the vertical screw (303) to drive the vertical screw (303) to rotate. The lifting block (401) is provided with a vertical screw hole. The lifting block (401) is sleeved on the vertical screw rod (303) through the vertical screw hole. When the vertical screw rod (303) rotates, it can drive the lifting block (401) to move along the vertical guide rail (301).

5. The bored pile head circumferential cutting device according to claim 4, characterized in that, The vertical groove (302), vertical screw (303) and vertical guide rail (301) are arranged in pairs. The lifting motor (306) is a dual-axis motor, which is set between the two vertical screws (303). The two output shafts of the dual-axis motor extend in opposite directions and are respectively connected to the vertical screw (303) on the corresponding side through a worm gear structure.

6. The bored pile head circumferential cutting device according to claim 5, characterized in that, A reinforcing plate (304) and a motor fixing plate (305) are provided between the two vertical guide rails (301), and the lifting motor (306) is fixed on the motor fixing plate (305).

7. The bored pile head circumferential cutting device according to claim 3, characterized in that, The cutting assembly (600) includes a feed rail (601), a feed block (605), and a feed plate (606). The cutting assembly (600) is fixedly mounted on the rotating module via a feed rail (601); the feed rail (601) is provided with a feed groove (602), a feed screw (603) is provided in the feed groove (602), a feed block (605) is provided with a screw hole, and is sleeved on the feed screw (603) through the screw hole; a feed motor (604) is provided at one end of the feed screw (603) so that the feed motor (604) drives the feed screw (603) to rotate, thereby driving the feed block (605) to move along the feed groove (602); The feed block (605) is fixedly connected to the feed plate (606). The feed plate (606) is provided with a cutting motor (610) and a cutting saw blade (608). The cutting motor (610) drives the cutting saw blade (608) to rotate.

8. The equipment for circumferential cutting of bored pile heads according to claim 7, characterized in that, The feed plate (606) is also provided with a motor frame (609) and a cutting shaft (607). The cutting motor (610) is fixed on the motor frame (609), and the cutting shaft (607) is fixed on the feed plate (606) by bearings. One end of the shaft is fixedly connected to the cutting saw blade (608), and the other end is connected to the output end of the cutting motor (610) through a belt drive mechanism.

9. A method for using a bored pile head circumferential cutting device, comprising the following steps: S1. Move the equipment to the location of the bored pile to be circumcised, start the lifting assembly (300), and adjust the height of the positioning assembly (500) to meet the circumcised position requirements; S2. Start the bidirectional motor (504) to separate and open the two semi-circular blocks (509), move the equipment to place the bored pile inside the positioning ring, start the bidirectional motor (504) again to gradually combine the two semi-circular blocks (509) and bring them close to the bored pile, and stop the bidirectional motor (504). S3. Adjust the central axis of the equipment positioning ring to make it coincide with the central axis of the bored pile, and start the bidirectional motor (504) again to make the positioning ring clamp the bored pile; S4. Adjust the cutting assembly (600) to prepare for cutting the bored pile; S5. Start the drive motor (506) to drive the rotating module to rotate around the positioning ring. At the same time, the cutting component (600) advances and rotates with the rotating module to cut. The drive motor (506) is fixedly set on the positioning ring and does not rotate with the rotating module, so as to realize the separation of the movement of the drive motor (506) and the cutting component (600) and realize the circumferential cutting of the bored pile.

10. The method of using a borehole pile head circumferential cutting device according to claim 9, characterized in that, In step S3, the avoidance component (400) and centering module described in claim 3 are used to make the central axis of the positioning ring coincide with the central axis of the bored pile.

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