Steel pipe pile interior cutting device and construction method thereof

Abstract

The invention discloses an internal cutting device for a steel pipe pile. The internal cutting device comprises a cutting executing mechanism which vertically moves in the steel pipe pile through a suspension mechanism or a jacking mechanism and conducts annular cutting along the pipe wall of the steel pipe pile. The invention further discloses a construction method for internal cutting of the steel pipe pile. The annular cutting operation can be completed from the interior of the pile body, and the annular cutting device has the advantages of being safe to operate, accurate in positioning, high in adaptability, environmentally friendly and efficient and can be widely applied to the field of building and structure foundation engineering construction.

Description

TECHNICAL FIELD

[0001] The present application relates to building and structure foundation engineering construction, in particular to a steel pipe pile internal cutting device and a construction method thereof. BACKGROUND

[0002] Steel pipe piles are widely used in various buildings and marine engineering as foundation supports due to their high strength and fast construction. When engineering is transformed, pile foundation is scrapped, or obstacles are encountered and need to be handled, the steel pipe piles that have been driven into the ground often need to be cut.

[0003] Currently, the cutting of steel pipe piles mainly adopts the following methods: 1. External manual gas cutting: divers or construction personnel carry oxygen-acetylene cutting equipment to work outside the pile. This method has great safety hazards (such as underwater operation risks), the cutting quality is greatly affected by human factors, the precision is low, and the environmental pollution is serious.

[0004] 2. External mechanical cutting: large chain cutting machines or diamond wire saws are used to cut the pile from the outside. This method requires large equipment, has poor applicability in narrow spaces or underwater environments, the equipment installation is complex, and it is difficult to operate for part of the pile buried in the soil.

[0005] 3. Internal blasting cutting: a blasting device is arranged inside the pile. This method is extremely dangerous, has a great impact on the surrounding environment, is strictly controlled, and is difficult to clean up later.

[0006] In summary, the existing technology generally has the problems of poor operation safety, difficult to guarantee cutting precision, great environmental constraints, and low efficiency. Therefore, there is an urgent need for a cutting device that can operate from the inside of the steel pipe pile, realize mechanization, automation, high precision, and safety and environmental protection. SUMMARY

[0007] The purpose of the present application is to overcome the deficiencies of the above background technology, and to provide a steel pipe pile internal cutting device and a construction method thereof, which can complete the ring cutting operation from the inside of the pile body, and has the characteristics of safe operation, accurate positioning, strong adaptability, and environmental protection and high efficiency.

[0008] The steel pipe pile internal cutting device provided by the present application comprises a cutting execution mechanism which moves vertically along the steel pipe pile and makes ring cutting along the pipe wall of the steel pipe pile through a suspension mechanism or a jacking mechanism.

[0009] In the above technical solution, the force receiving end of the suspension mechanism or the jacking mechanism is provided with a liftable operation platform, the other end of the liftable operation platform opposite to the force receiving end of the suspension mechanism or the jacking mechanism is connected with the cutting execution mechanism, and the liftable operation platform is provided with a stabilizing mechanism in the circumferential direction.

[0010] In the above technical solution, the suspension mechanism is a suspension rope connected to the top of the liftable operation platform in sequence and a winch located at the top of the steel pipe pile; or the jacking mechanism is a hydraulic cylinder located at the bottom of the steel pipe pile, and the jacking surface of the hydraulic cylinder is connected to the bottom of the liftable operation platform.

[0011] In the above technical solution, the liftable operation platform is connected to the suspension rope, the cutting execution mechanism has a hydraulic motor or a high-power servo motor built in the bottom of the liftable operation platform, the power end of the hydraulic motor or the high-power servo motor extending downward is provided with a rotary cutting executor in the shape of L as a whole, the horizontal end of the rotary cutting executor is provided with a cutting tool fixing clamp, and the cutting tool fixing clamp is provided with a high-speed angle grinder or a water jet cutting head.

[0012] In the above technical solution, the liftable operation platform is connected to the suspension rope, and the cutting execution mechanism is a crawling cutting machine with magnetic adsorption function located at the edge of the bottom of the liftable operation platform, and the working surface of the crawling cutting machine is horizontally arranged and connected to the inner wall of the steel pipe pile.

[0013] In the above technical solution, the stabilizing mechanism is a plurality of radial telescopic arms uniformly distributed along the circumference of the liftable operation platform and capable of abutting against the inner wall of the steel pipe pile, and the liftable operation platform is built in with telescopic execution mechanisms corresponding to the radial telescopic arms one by one, and the power shaft of one of the telescopic execution mechanisms is connected to the vertical end of the rotary cutting executor.

[0014] In the above technical solution, the telescopic execution mechanism is one or several of an electric push rod, a hydraulic cylinder or a four-bar linkage mechanism.

[0015] In the above technical solution, a PLC (Programmable Logic Controller) is further included, the liftable operation platform is built in with an encoder and an inclination sensor, each telescopic execution mechanism is provided with a pressure sensor, the encoder and the inclination sensor are respectively connected to the signal end of the PLC, the pressure sensor is connected to the signal end of the PLC, the control end of the PLC is respectively connected to the signal end of the high-speed angle grinder, the water jet cutting head or the crawling cutting machine, the control end of the PLC is respectively connected to the signal end of the winch or the hydraulic cylinder, the control end of the PLC is respectively connected to the signal end of the hydraulic motor or the high-power servo motor at the bottom of the liftable operation platform, and the control end of the PLC is respectively connected to the signal end of the electric push rod, the hydraulic cylinder or the four-bar linkage mechanism.

[0016] In the above technical solution, the high-speed angle grinder, the water jet cutting head or the crawling cutting machine is provided below with a chip collecting hopper and a chip removal pipeline, and the chip removal pipeline extends to the opening outside the top of the steel pipe pile.

[0017] The application further discloses a construction method of the steel pipe pile internal cutting device, which has the following steps: step one, preparation and hoisting stage: fixing a lifting power source on the top of the steel pipe pile, connecting electric power and control cables, and slowly and vertically hoisting the steel pipe pile internal cutting device into the steel pipe pile (1) to be cut by using the hoisting equipment on the top of the steel pipe pile until the lifting operation platform completely enters the pile mouth; step two, positioning and calibration stage: slowly lowering the lifting operation platform along the inner wall of the steel pipe pile by driving the lifting operation platform by the PLC, the guide wheel set of the lifting operation platform is close to the inner wall of the steel pipe pile, the inclination sensor of the lifting operation platform monitors the horizontal state of the lifting operation platform in real time and can automatically or manually level, when the lifting operation platform is lowered to the predetermined cutting elevation accurately measured by the encoder, the lowering is stopped and the final positioning is confirmed; step three, cutting preparation stage: tightly pressing the pipe wall: synchronously extending the radial telescopic arm, driving the rotary cutting executor to move radially until the high-speed angle grinder or the water jet cutting head on the rotary cutting executor is stably pressed against the inner wall of the steel pipe pile, the pressure sensor feeds back the pressing force in real time to ensure that the preset optimal working pressure is reached; step four, cutting execution stage: a. starting cutting: starting the hydraulic motor or the high-power servo motor to drive the cutting tool to rotate at high speed or generate cutting jet; b. implementing cutting: slowly and uniformly rotating the lifting operation platform around the central axis by driving the lifting operation platform by the PLC, while the lifting operation platform is rotating, the high-speed angle grinder or the water jet cutting head continuously and uniformly cuts the inner wall of the steel pipe pile under the continuous pressure of the radial telescopic arm, the cooling liquid continuously cools, and the mixture of the generated chippings and the cooling liquid is captured by the lower chip collecting hopper and is discharged outside the steel pipe pile in real time through the chip discharging pipeline; step five, finishing and evacuation stage: a. completing cutting: immediately stopping the high-speed angle grinder or the water jet cutting head when the lifting operation platform rotates 360° to complete the whole-circle cutting; b. retracting the device: retracting the radial telescopic arm to make the high-speed angle grinder or the water jet cutting head completely separate from the pile wall of the steel pipe pile and reset, and then stopping cooling and chipping; c. lifting out of the pile: starting the lifting operation platform to stably lift the whole steel pipe pile internal cutting device out of the steel pipe pile to complete the cutting operation.

[0018] The steel pipe pile internal cutting device and the construction method thereof have the following beneficial effects: 1. High safety: the operator remotely controls outside the pile, which completely avoids entering the pile or directly operating in a high-risk environment (such as underwater or high altitude), and fundamentally eliminates personal safety hazards.

[0019] 2. High cutting precision: the cutting elevation and cutting plane can be accurately controlled through the cooperation of the PLC, the encoder and the inclination sensor, the cutting flatness is high, and the high-standard engineering requirements are met.

[0020] 3. Strong environmental adaptability: Since the operation is carried out inside the pile, the influence of external environment (such as waves, weather, surrounding space) is small. It is especially suitable for underwater cutting, pile operation in soil and other complex working conditions.

[0021] 4. High construction efficiency: The mechanized and automated operation mode greatly improves the cutting efficiency.

[0022] 5. Integrated and modular design: The device integrates power, control and execution in one, with compact structure, convenient transportation and hoisting. The modular design of each system facilitates maintenance and replacement. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the steel pipe pile internal cutting device of the present application; Figure 2 is a flowchart of the construction method of the steel pipe pile internal cutting of the present application. DETAILED DESCRIPTION

[0024] The present application will be further described in detail below in combination with the drawings and examples, but the examples should not be understood as limiting the present application.

[0025] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a steel pipe pile internal cutting device which can complete the ring cutting operation from the inside of the pile body, with the characteristics of safe operation, accurate positioning, strong adaptability, environmental protection and high efficiency.

[0026] Example 1 Referring to Figure 1 The steel pipe pile internal cutting device of the present application comprises a cutting execution mechanism which moves vertically along the steel pipe pile 1 and performs ring cutting along the pipe wall of the steel pipe pile 1 through a suspension mechanism or a jacking mechanism.

[0027] The force receiving end of the suspension mechanism or jacking mechanism is provided with a liftable operation platform 2, the other end of the liftable operation platform 2 opposite to the force receiving end of the suspension mechanism or jacking mechanism is connected with the cutting execution mechanism, and the liftable operation platform 2 is provided with a stabilizing mechanism in the circumferential direction.

[0028] The suspension mechanism comprises a suspension rope 3 connected with the top of the liftable operation platform 2 in sequence and a winch located at the top of the steel pipe pile 1; or the jacking mechanism is a hydraulic oil cylinder located at the bottom of the steel pipe pile 1, and the jacking surface of the hydraulic oil cylinder is connected with the bottom of the liftable operation platform 2.

[0029] The lifting operation platform 2 is connected with the suspension rope 3, the cutting execution mechanism has a hydraulic motor or a high-power servo motor built in the bottom of the lifting operation platform 2, the power end of the hydraulic motor or the high-power servo motor extending downward is provided with a rotary cutting executor 4 in the shape of L as a whole, the horizontal end of the rotary cutting executor 4 is provided with a cutter fixing clamp 5, and the cutter fixing clamp 5 is provided with a high-speed angle grinder or a water jet cutting head.

[0030] The stabilizing mechanism is a plurality of radial telescopic arms 6 uniformly distributed along the circumference of the lifting operation platform 2 and capable of abutting against the inner wall of the steel pipe pile 1, and the lifting operation platform 2 is built in a telescopic execution mechanism corresponding to the radial telescopic arm 6, wherein the power shaft of one telescopic execution mechanism is connected with the vertical end of the rotary cutting executor 4.

[0031] The telescopic execution mechanism is one or more of an electric push rod, a hydraulic cylinder or a four-bar linkage mechanism.

[0032] The steel pipe pile internal cutting device also comprises a control part PLC 7, in this embodiment, the control part also comprises one or more of a CPU, a GPU, a single-chip microcomputer, a Soc, an FPGA, a DSP or an NPU; the lifting operation platform 2 is built in an encoder and an inclination sensor, and each telescopic execution mechanism is provided with a pressure sensor, the encoder and the inclination sensor are connected with the signal end of the PLC 7 respectively, the pressure sensor is connected with the signal end of the PLC 7, the control end of the PLC 7 is connected with the signal end of the high-speed angle grinder, the water jet cutting head or the crawling cutting machine respectively, the control end of the PLC 7 is connected with the signal end of the winch or the hydraulic cylinder respectively, the control end of the PLC 7 is connected with the signal end of the hydraulic motor or the high-power servo motor at the bottom of the lifting operation platform 2 respectively, and the control end of the PLC 7 is connected with the signal end of the electric push rod, the hydraulic cylinder or the four-bar linkage mechanism respectively.

[0033] The high-speed angle grinder, the water jet cutting head or the crawling cutting machine is provided below with a scrap collecting hopper and a scrap discharge pipeline, and the scrap discharge pipeline extends to the opening outside the top of the steel pipe pile 1.

[0034] Embodiment 2 This embodiment is basically the same as embodiment 1, and the difference lies in that: The lifting operation platform 2 is connected with the suspension rope 3, the cutting execution mechanism is a crawling cutting machine with a magnetic adsorption function located at the edge of the bottom of the lifting operation platform 2, and the working surface of the crawling cutting machine is horizontally arranged and connected with the inner wall of the steel pipe pile 1.

[0035] Embodiment 3 Referring to Figure 2 The construction method for cutting the inside of the steel pipe pile comprises the following steps executed in sequence: Step one, preparation and lifting stage: Fix the lifting power source (such as winch) on the top of the steel pipe pile 1, and connect the power and control cable. Use the lifting equipment on the top of the steel pipe pile 1 to slowly and vertically lift the internal cutting device of the steel pipe pile into the inside of the steel pipe pile to be cut until the lifting operation platform 2 completely enters the pile mouth.

[0036] Step two, positioning and calibration stage: drive the lifting operation platform 2 to slowly descend along the inner wall of the steel pipe pile 1 through the PLC 7. In this process, the guide wheel group of the lifting operation platform 2 closely abuts the inner wall of the steel pipe pile 1 to ensure the stability of the descending process. The inclination sensor on the lifting operation platform 2 monitors the horizontal state of the lifting operation platform 2 in real time and can be automatically or manually leveled. When the lifting operation platform 2 descends to the predetermined cutting elevation accurately measured by the encoder, stop descending and perform final positioning confirmation.

[0037] Step three, cutting preparation stage: a. Pipe wall compression: control the radial telescopic arm 6 to synchronously extend outward, push the rotating cutting executor 4 to move radially until the cutting tool (such as diamond cutting piece) or execution mechanism (such as water jet nozzle) thereon stably abuts against the inner wall of the steel pipe pile 1. The pressure sensor feeds back the compression force in real time to ensure that the best working pressure is reached.

[0038] Step four, ring cutting execution stage: a. Start cutting: start the cutting executor (such as hydraulic motor or servo motor) to drive the cutting tool to rotate at high speed or generate cutting jet.

[0039] b. Implement ring cutting: drive the lifting operation platform 2 to slowly and uniformly rotate around the central axis thereof (or drive the cutting executor to move along the ring-shaped track) through the PLC 7. While the lifting operation platform 2 rotates, the cutting executor continuously and uniformly cuts the inner wall of the steel pipe pile 1 under the continuous pressure of the radial telescopic arm 6. The cooling liquid continuously cools, and the mixture of the generated debris and the cooling liquid is captured by the lower debris collecting hopper and discharged outside the steel pipe pile 1 in real time through the debris discharge pipeline.

[0040] Step five, finishing and evacuation stage: a. Complete cutting: immediately stop the cutting executor when the lifting operation platform 2 rotates 360° to complete the whole ring cutting.

[0041] b. Recover the device: control the radial telescopic arm 6 to retract so that the cutting executor completely separates from the pile wall of the steel pipe pile 1 and returns to the transportation state. Then, stop the cooling and debris discharge system.

[0042] c. Lift out of the pile: start the lifting operation platform 2 to stably lift the whole steel pipe pile internal cutting device out of the steel pipe pile 1 to complete the cutting operation.

[0043] The principle of the technical solution of the present application is stated as follows: (I) The structural principle is as follows: 1. The liftable operation platform 2 is the base of the device, and its external contour matches the inner diameter of the steel pipe pile 1. The liftable operation platform 2 is provided with adjustable guide wheels around the four sides to ensure that the liftable operation platform 2 remains stable when being lifted in the steel pipe pile 1, preventing rotation and deflection. The liftable operation platform 2 is connected with the winch at the top of the pile or the jacking mechanism at the bottom of the pile through the suspension rope 3 or the hydraulic cylinder to realize accurate vertical positioning.

[0044] 2. The radial telescopic arm 6 is symmetrically arranged on both sides or around the four sides of the liftable operation platform 2. The radial telescopic arm 6 can adopt an electric push rod, a hydraulic cylinder or an optimized four-bar linkage mechanism. The radial telescopic arm 6 is provided with a cutting executor at the end and can drive the cutting executor to move radially so as to be tightly pressed against the inner wall of the steel pipe pile 1. The radial telescopic arm 6 is integrated with a pressure sensor to realize real-time feedback of the pressing force, avoiding cutting failure caused by insufficient pressure or equipment jam caused by excessive pressure.

[0045] 3. The cutting executor: preferably a high-speed angle grinder (equipped with a diamond cutting piece) driven by a hydraulic motor or a high-power servo motor, or a crawling cutting machine with magnetic adsorption function. For special environments (such as avoiding sparks), a water jet cutting head can be used. The cutting executor can rotate the arm to slowly rotate 360° for ring cutting under the instruction of the PLC 7.

[0046] 4. Power and control system: the core control unit adopts a PLC 7 (programmable logic controller). The system integrates: Power source: hydraulic pump station or large-capacity battery pack.

[0047] Positioning module: an encoder is used to record the depth of the platform, and an inclination sensor is used to ensure that the cutting plane is horizontal.

[0048] Execution control: control lifting, telescoping, cutting start-stop and rotation speed.

[0049] Human-machine interface: the operator can remotely operate and monitor the state through the remote controller or control cable outside the pile.

[0050] (II) Operating principle: During operation, first, the steel pipe pile internal cutting device is hoisted into the steel pipe pile 1. The device is lowered to the preset cutting level through the PLC 7. Then, the radial telescopic arm 6 is started to smoothly push the cutting executor to and press against the inner wall of the steel pipe pile 1. Then, the cutting motor is started. Through the self-circumferential movement of the cutting executor along the track, continuous and uniform ring cutting of the inner wall of the steel pipe pile 1 is realized. During the cutting process, the pressure sensor feeds back data in real time to ensure that the cutting depth is consistent and the cut is smooth. After completion, the components are sequentially retracted, and the steel pipe pile internal cutting device is lifted out of the steel pipe pile 1.

[0051] Innovative points: 1. Innovation of operation mode: a new operation mode of “mechanized ring cutting of tubular structures from the inside” is proposed, which overturns the traditional external manual or large equipment operation mode.

[0052] 2. Built-in self-adaptive pressing mechanism: the radial telescopic arm 6 with pressure feedback is adopted, which can automatically adapt to the slight deformation of the inner wall of the steel pipe pile 1, such as non-circularity, to ensure that the cutting executor always stably and effectively acts on the cutting line.

[0053] 3. Integrated intelligent control system: the functions of precise positioning (depth and level), self-adaptive pressing, rotary cutting, cooling and chip removal are integrated on a compact platform, and are collaboratively managed by the unified intelligent control system, i.e. the PLC 7, to realize the automation and intelligentization of the entire cutting process.

[0054] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

[0055] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A steel pipe pile internal cutting device, characterized by: The cutting execution mechanism is vertically moved along the steel pipe pile (1) through a suspension mechanism or a jacking mechanism and annularly cuts along the pipe wall of the steel pipe pile (1).

2. The internal cutting device of a steel pipe pile according to claim 1, characterized in that: The force receiving end of the suspension mechanism or the jacking mechanism is provided with a liftable operation platform (2), the other end of the liftable operation platform (2) opposite to the force receiving end of the suspension mechanism or the jacking mechanism is connected with the cutting execution mechanism, and the liftable operation platform (2) is circumferentially provided with a stabilizing mechanism.

3. The internal cutting device of a steel pipe pile according to claim 2, characterized in that: The suspension mechanism is a suspension rope (3) connected with the top of the liftable operation platform (2) in sequence and a winch located at the top of the steel pipe pile (1), or the jacking mechanism is a hydraulic oil cylinder located at the bottom of the steel pipe pile (1), and the jacking surface of the hydraulic oil cylinder is connected with the bottom of the liftable operation platform (2).

4. The internal cutting device of the steel pipe pile according to claim 3, characterized in that: The liftable operation platform (2) is connected with the suspension rope (3), the cutting execution mechanism is provided with a hydraulic motor or a high-power servo motor built in the bottom of the liftable operation platform (2), the power end of the hydraulic motor or the high-power servo motor extending downward is provided with a rotary cutting executor (4) in the shape of L as a whole, the horizontal end of the rotary cutting executor (4) is provided with a cutter fixing clamp (5), and the cutter fixing clamp (5) is provided with a high-speed angle grinder or a water jet cutting head.

5. The steel pipe pile internal cutting device according to claim 3, characterized in that: The liftable operation platform (2) is connected with the suspension rope (3), and the cutting execution mechanism is a crawling cutting machine with magnetic adsorption function located at the edge of the bottom of the liftable operation platform (2), and the working surface of the crawling cutting machine is horizontally arranged and connected with the inner wall of the steel pipe pile (1).

6. The steel pipe pile internal cutting device according to claim 4, characterized by: The stabilizing mechanism is a plurality of radial telescopic arms (6) uniformly distributed along the circumference of the liftable operation platform (2) and capable of abutting against the inner wall of the steel pipe pile (1), and the liftable operation platform (2) is built in a telescopic execution mechanism corresponding to the radial telescopic arm (6), and the power shaft of one telescopic execution mechanism is connected with the vertical end of the rotary cutting executor (4).

7. The internal cutting device of a steel pipe pile according to claim 6, characterized in that: The telescopic execution mechanism is one or more of an electric push rod, a hydraulic cylinder or a four-bar linkage mechanism.

8. The internal cutting device of the steel pipe pile according to claim 7, characterized in that: The liftable operation platform (2) is built in an encoder and an inclination sensor, each telescopic execution mechanism is provided with a pressure sensor, the encoder and the inclination sensor are respectively connected with the signal end of the PLC (7), the pressure sensor is connected with the signal end of the PLC (7), the control end of the PLC (7) is respectively connected with the signal end of the high-speed angle grinder, the water jet cutting head or the crawling cutting machine, the control end of the PLC (7) is respectively connected with the signal end of the winch or the hydraulic oil cylinder, the control end of the PLC (7) is respectively connected with the signal end of the hydraulic motor or the high-power servo motor at the bottom of the liftable operation platform (2), and the control end of the PLC (7) is respectively connected with the signal end of the electric push rod, the hydraulic cylinder or the four-bar linkage mechanism.

9. The steel pipe pile internal cutting device according to claim 8, characterized in that: The high-speed angle grinder, the water jet cutting head or the crawling cutting machine is provided below with a chip collecting hopper and a chip removal pipeline, and the chip removal pipeline extends to the opening outside the top of the steel pipe pile (1).

10. A method of constructing an internal cutting device for a steel pipe pile according to claim 9, characterized by: The method comprises the following steps: Step one, preparation and lifting stage: the lifting power source is fixed on the top of the steel pipe pile (1), and the power and control cable are connected. The internal cutting device of the steel pipe pile is slowly and vertically lifted into the internal cutting device of the steel pipe pile (1) by the lifting equipment on the top of the steel pipe pile (1), until the lifting operation platform (2) completely enters the pile mouth; Step two, positioning and calibration stage: the lifting operation platform (2) is slowly lowered along the inner wall of the steel pipe pile (1) by the PLC (7). The guide wheel group of the lifting operation platform (2) is closely attached to the inner wall of the steel pipe pile (1). The inclination sensor of the lifting operation platform (2) monitors the horizontal state of the lifting operation platform (2) in real time, and can be automatically or manually leveled. When the lifting operation platform (2) is lowered to the predetermined cutting elevation accurately measured by the encoder, the lowering is stopped and the final positioning is confirmed; Step three, cutting preparation stage: Pipe wall compression: control the radial telescopic arm (6) to synchronously stretch outwards, push the rotary cutting executor (4) to move radially, until the high-speed angle grinder or water jet cutting head on it stably abuts against the inner wall of the steel pipe pile (1). The pressure sensor feedbacks the compression force in real time, ensuring that the best working pressure is reached; Step four, cutting execution stage: a. Start cutting: start the hydraulic motor or high-power servo motor to drive the cutting tool to rotate at high speed or generate cutting jet; b. Implement ring cutting: the lifting operation platform (2) is slowly and uniformly rotated around the central axis by the PLC (7). While the lifting operation platform (2) is rotating, the high-speed angle grinder or water jet cutting head continuously and uniformly cuts the inner wall of the steel pipe pile (1) under the continuous pressure of the radial telescopic arm (6). The cooling liquid continuously cools down, and the mixture of the generated debris and the cooling liquid is captured by the lower debris collecting hopper and discharged outside the steel pipe pile (1) through the debris discharge pipeline in real time; Step five, finishing and evacuation stage: a. Complete cutting: when the lifting operation platform (2) rotates 360° to complete the whole ring cutting, the high-speed angle grinder or water jet cutting head is immediately stopped; b. Recover the device: control the radial telescopic arm (6) to retract, so that the high-speed angle grinder or water jet cutting head completely separates from the pile wall of the steel pipe pile (1) and returns to the original position, and then stop cooling and debris removal; c. Lift out of the pile: start the lifting operation platform (2) to smoothly lift the whole steel pipe pile internal cutting device out of the steel pipe pile (1), and complete the cutting operation.

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