Steel pipe pile anti-slip device with cushioning airbag and use method thereof

Abstract

The present invention discloses a device for preventing steel pipe piles from slipping with a buffer airbag and a method for using the device. The device comprises a cover body, a cover plate arranged in the cover body, an internal locking mechanism and a buffer airbag device. The cover body is mounted on the steel pipe pile to be constructed, and the internal locking mechanism enables the inner ring of the flange on the inner wall of the upper end of the steel pipe pile to be clamped between the cover plate and the internal locking mechanism. A water-permeable channel communicating with the outside is provided on the cover plate and the cover body, and an adaptive closing valve is provided in the water-permeable channel, which can adaptively control the conduction state of the water-permeable channel according to the sinking state of the steel pipe pile. During the normal vibration sinking process of the steel pipe pile, the buffer airbag is compressed each time the vibrating hammer strikes, which can reduce the obstruction of the water in the steel pipe pile to the sinking of the steel pipe pile. When the steel pipe pile slips, the tapered valve core of the adaptive closing valve is pushed by the continuous and rapid outflow of water to overcome the resistance of the reset spring and close the valve port, thereby increasing the water pressure in the steel pipe pile and effectively preventing the pile from slipping.

Description

Technical Field

[0001] The present invention belongs to the technical field of pile foundation construction of marine engineering, and in particular relates to a steel pipe pile anti-slip device with a buffer air bag and a use method thereof. Background Art

[0002] Marine resource extraction and development equipment, from shallow-water ports, bridges, and offshore wind farms to deep-water jacket platforms, all rely on pile foundations. Steel pipe piles can withstand the intermittent impacts of pile hammers, offer high bearing capacity, design flexibility, and can be easily adjusted by lengthening or truncating the pile length. They are widely used in offshore structure pile foundation construction. Furthermore, open-ended steel piles are easier to drive into the soil than closed-ended ones. The offshore piling process is susceptible to wind resistance, currents, geotechnical properties, and environmental constraints, increasing the risks and challenges of pile driving. Furthermore, with the continuous advancement of global material and equipment manufacturing capabilities, the size of steel piles has undergone significant changes, with larger diameters, longer shafts, and deeper penetration depths. Therefore, safety protection designs must be incorporated into the driving scheme to ensure safe pile sinking.

[0003] During the continuous driving of large-diameter, extra-long steel piles, an unexpected condition may occur: the pile may suddenly and automatically sink to a certain depth during a single hammer blow or between hammer blows. This self-sinking condition is referred to as pile slippage during construction. Pile slippage is a dangerous phenomenon during piling construction, affecting driving efficiency. Excessive slippage can damage the hammer and pile, increase driving costs, and even render the pile foundation unusable, necessitating pile replacement or relocation of the driving area. Pile slippage can also hinder the accurate assessment of the bearing capacity of the pile foundation after driving.

[0004] To solve the problem of large-diameter steel pipe pile slippage, the current existing technology mainly involves adding a flow limiting plate at the pile mouth (for example, the patent with publication number CN113863307A) to change the water flow rate of the water permeable holes on the flow limiting plate, thereby slowing down the penetration speed during pile slippage. This method requires first using detection means to determine whether the steel pipe pile has slipped and then actively controlling the water flow rate of the water permeable holes on the flow limiting plate through an electronic control system. The detection and control system of this method is relatively complex, resulting in low working stability and effectiveness, and the response speed is also insufficient when dealing with rapid pile slippage, which fails to fully meet the needs of preventing pile slippage.

[0005] In addition, the fixing effect of the existing anti-slip pile device and the steel pipe pile needs to be improved. The existing anti-slip pile device is fixed to the side wall of the steel pipe pile by friction; however, since the water pressure in the pile increases sharply when the pile slips, there is a risk of the anti-slip pile device and the steel pipe pile becoming detached. Summary of the Invention

[0006] The purpose of the present invention is to provide a steel pipe pile anti-slip device with a buffer air bag and a method of using the same in order to address the technical defects in the prior art.

[0007] The technical solution adopted to achieve the purpose of the present invention is:

[0008] A steel pipe pile anti-slip device with a buffer airbag comprises a cover body, a cover plate arranged in the cover body, an internal locking mechanism and a buffer airbag device;

[0009] The cover body includes, from bottom to top, a lower outer sleeve, an intermediate cabin, and an upper cylinder, wherein the lower outer sleeve is used to be sleeved on the steel pipe pile to be constructed, the cover plate is arranged inside the cover body and located on the top of the lower outer sleeve, and a sealing ring is provided on the inner wall of the lower outer sleeve; the intermediate cabin is located above the cover plate, and the upper cylinder is located above the intermediate cabin, and the upper end of the upper cylinder is used to install a vibrating hammer device;

[0010] The internal locking mechanism includes a driving hydraulic cylinder and multiple groups of force arm mechanisms driven by the driving hydraulic cylinder. The driving hydraulic cylinder is fixedly installed in the middle compartment of the cover body, and the driving rod of the driving hydraulic cylinder downwardly penetrates the cover plate. The driving hydraulic cylinder can synchronously drive the multiple groups of force arm mechanisms to open outward and upward, so that the force arm mechanisms press against the bottom surface of the inner ring of the flange on the inner wall of the upper end of the steel pipe pile, so that the inner ring of the flange on the inner wall of the upper end of the steel pipe pile is clamped between the cover plate and the force arm mechanisms.

[0011] Through holes are provided on the cover plate and the side walls of the intermediate compartment. The through holes of the cover plate are connected to the through holes on the side walls of the intermediate compartment via connecting pipes to form a water permeable channel. An adaptive closing valve is provided in the water permeable channel. The adaptive closing valve can adaptively control the conduction state of the water permeable channel according to the sinking state of the steel pipe pile. The adaptive closing valve includes a valve wall and a conical valve core installed inside the valve wall, a return spring, and a support plate. The front end of the valve wall is an open conical wall and the rear end is a cylindrical wall. The support plate is fixedly connected to the cylindrical wall of the valve wall. The conical valve core is installed on the support plate via a return spring. When the return spring is in a natural state, the conical valve core and the opening of the conical wall are separated.

[0012] The buffer airbag device is arranged at the bottom of the cover plate, and the buffer airbag device includes a mounting frame, a baffle and a buffer airbag. The mounting frame is connected to the bottom of the cover plate, the baffle is arranged on the mounting frame and is located below the internal locking mechanism, and the buffer airbag is installed inside the mounting frame below the baffle.

[0013] In the above technical solution, a shaft sleeve for mounting a driving rod for driving the hydraulic cylinder is provided at the center of the cover plate, and the driving rod is installed through the shaft sleeve.

[0014] In the above technical solution, a mounting plate is fixedly installed at the bottom of the driving rod of the driving hydraulic cylinder. Each set of force arm mechanisms includes a connecting rod and a movable bent arm. The top end of the connecting rod is hinged to the bottom surface of the cover plate, and the bottom end of the connecting rod is hinged to the middle position of the movable bent arm. The inner end of the movable bent arm is hinged to the mounting plate, and a top block is provided at the outer end of the movable bent arm. When the driving rod of the driving hydraulic cylinder contracts, the movable bent arm is driven to expand, so that the top block at the outer end of the movable bent arm presses against the bottom surface of the inner ring of the flange on the inner wall of the upper end of the steel pipe pile.

[0015] In the above technical solution, a limit frame is also provided on the bottom surface of the center position of the cover plate, and a guide hole is provided at the center position of the bottom of the limit frame. A guide sleeve is installed in the guide hole, and the driving rod of the driving hydraulic cylinder is installed through the guide sleeve.

[0016] In the above technical solution, a hatch is provided on the top of the middle cabin to facilitate people to enter the middle cabin to perform maintenance on the driving hydraulic cylinder.

[0017] In the above technical solution, a cable hole is further provided on the side wall of the middle compartment for leading out the cable for driving the hydraulic cylinder.

[0018] The method of using the above-mentioned steel pipe pile anti-slip device with a cushioning airbag is as follows:

[0019] Step 1: Sleeve the lower outer sleeve of the steel pipe pile anti-slip device onto the upper end of the steel pipe pile, and then control the driving rod of the driving hydraulic cylinder of the internal locking mechanism to retract, so that the inner ring of the flange on the inner wall of the upper end of the steel pipe pile is clamped between the cover plate and the lever arm mechanism;

[0020] Step 2: Install a vibrating hammer device on the upper cylinder of the steel pipe pile anti-slip device, and fill the steel pipe pile with water through the permeable channel and the adaptive closing valve;

[0021] Step 3: Start the vibrating hammer device to vibrate and sink the steel pipe pile. During the vibration sinking process of the steel pipe pile, when the steel pipe pile sinks at a normal speed, the water inside the steel pipe pile can be discharged at a low speed through the adaptive closing valve and the water permeable channel. Moreover, each time the vibrating hammer device hammers, the buffer air bag inside the steel pipe pile is compressed, reducing the water pressure inside the steel pipe pile, thereby reducing the obstruction of the water inside the steel pipe pile to the sinking of the steel pipe pile, thereby ensuring the hammering effect. When the steel pipe pile slips, the water pressure inside the steel pipe pile suddenly increases, and the speed of the water discharged is greatly increased. Under the action of the continuous and rapid water flow, the conical valve core is pushed to overcome the resistance of the return spring to close the opening of the conical wall, thereby closing the adaptive closing valve and the water permeable channel, so that the water pressure inside the steel pipe pile increases, effectively preventing the pile from slipping.

[0022] Step 4: After the steel pipe pile is vibrated and sunk to the specified depth, the driving rod of the hydraulic cylinder that controls the internal locking mechanism is extended, the driving arm mechanism is retracted, and then the steel pipe pile anti-slip device and the vibrating hammer device are lifted together by the pull rope.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention's anti-slip pile device employs a housing that fits over the upper end of a steel pipe pile. A cover plate and an internal locking mechanism are incorporated within the housing. This internal locking mechanism clamps the inner flange ring of the inner wall of the upper end of the steel pipe pile between the cover plate and the internal locking mechanism. Compared to prior art methods of frictionally securing the anti-slip pile device to the sidewall of the steel pipe pile, the present invention's upper and lower clamping method eliminates the risk of the pile falling out. Furthermore, the internal locking mechanism utilizes a single hydraulic cylinder to synchronously drive multiple lever arm mechanisms, resulting in a simple structure, low cost, and high stability.

[0025] The anti-slip pile device of the present invention has a simple structure and does not require a complicated detection and control system. By designing a water-permeable channel connected to the outside and arranging an adaptive closing valve in the water-permeable channel, the conduction state of the water-permeable channel can be adaptively controlled according to the sinking state of the steel pipe pile. During the vibration sinking process of the steel pipe pile, when the steel pipe pile sinks at a normal speed, the water inside the steel pipe pile can be discharged through the adaptive closing valve and the water-permeable channel. When the steel pipe pile slips, the water pressure inside the steel pipe pile suddenly increases, and the outflow speed of the water increases greatly. Under the action of the continuous and rapid outflow of water, the conical valve core of the adaptive closing valve is pushed to overcome the resistance of the reset spring to close the opening of the conical wall, so that the water pressure inside the steel pipe pile increases, thereby effectively preventing the pile from slipping.

[0026] The present invention designs a buffer airbag device at the lower part of the anti-slip pile device. When in use, the buffer airbag floats on the bottom surface of the baffle under the buoyancy of the water in the steel pipe pile and the blocking effect of the baffle. During the normal vibration and sinking process of the steel pipe pile, the water pressure in the steel pipe pile increases correspondingly each time the vibrator hammers. Therefore, the buffer airbag in the steel pipe pile will be compressed by the water pressure each time the vibrator hammers, and the volume of the buffer airbag is compressed, thereby leaving a part of the space in the steel pipe pile empty, and this space will be filled with water, thereby reducing the water pressure in the steel pipe pile, that is, reducing the obstruction of the water in the steel pipe pile to the sinking of the steel pipe pile, making it easier for the steel pipe pile to sink under the hammering action of the vibrator, thereby ensuring the hammering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the steel pipe pile anti-slip device with a cushioning air bag of the present invention.

[0028] Figure 2 It is a schematic diagram showing that the internal locking mechanism of the anti-slip device for steel pipe piles with a cushioning airbag of the present invention is in a locked state.

[0029] Figure 3 Schematic diagram of the natural state of the adaptive closing valve in the present invention.

[0030] Figure 4 This is a schematic diagram of the adaptive closing valve in the present invention being in a closed state after being pushed by water flow.

[0031] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] See attached Figure 1 -Attached Figure 3 A steel pipe pile anti-slip device with a buffer airbag includes a cover body 1 and a cover plate 2 arranged in the cover body, an internal locking mechanism 3 and a buffer airbag device 9.

[0034] The cover body 1 includes a lower outer sleeve 1.1, an intermediate chamber 1.2 and an upper cylinder 1.3 from bottom to top, wherein the lower outer sleeve 1.1 is used to be sleeved on the steel pipe pile 6 to be constructed, the cover plate 2 is arranged inside the cover body 1 and located on the top of the lower outer sleeve 1.1, closing the top of the lower outer sleeve 1.1, and a rubber sealing ring 1.11 is provided on the inner wall of the lower outer sleeve 1.1 to increase the sealing effect between the lower outer sleeve 1.1 and the steel pipe pile 6, so that the steel pipe A closed space effect is formed inside the pile 6; the intermediate cabin 1.2 is located above the cover plate 2, and the driving hydraulic cylinder of the internal locking mechanism 3 is installed in the intermediate cabin 1.2; the upper cylinder 1.3 is located above the intermediate cabin 1.2, and when working, the upper port of the upper cylinder 1.3 is used to install a vibrating hammer device (in the prior art, the vibrating hammer device is installed on the upper port of the steel pipe pile 6 to directly generate a vibrating sinking force on the steel pipe pile 6), so that the vibrating sinking force generated by the vibrating hammer device can be transmitted to the steel pipe pile 6 through the cover body 1.

[0035] The internal locking mechanism 3 is used to lock the cover body 1 on the steel pipe pile 6 and to fix the cover plate 2 inside the cover body 1 on the upper end of the steel pipe pile 6 . Specifically, the internal locking mechanism 3 includes a driving hydraulic cylinder 3.1 and six groups of force arm mechanisms 3.2 driven by the driving hydraulic cylinder 3.1. The driving hydraulic cylinder 3.1 is fixedly installed in the middle compartment 1.2 of the cover body 1, and the driving rod of the driving hydraulic cylinder 3.1 vertically downwardly penetrates the cover plate 2 (a shaft sleeve 4 for installing the driving rod is provided at the center position of the cover plate 2, and the driving rod is installed in the shaft sleeve 4). A mounting plate 3.3 is fixedly installed at the bottom of the driving rod of the driving hydraulic cylinder 3.1, and the six groups of force arm mechanisms 3.2 are installed on the mounting plate 3.2 at equal intervals around the circumference. The driving hydraulic cylinder 3.1 can synchronously drive the six groups of force arm mechanisms 3.2 to be stretched outward and topward, so that the six groups of force arm mechanisms are pressed against the bottom surface of the flange inner ring 6.1 of the inner wall of the upper end of the steel pipe pile 6, so that the flange inner ring 6.1 of the inner wall of the upper end of the steel pipe pile 6 is clamped between the cover plate 2 and the force arm mechanism 3.2. Specifically, each arm mechanism 3.2 includes a connecting rod 3.21 and a movable arm 3.22. The top end of the connecting rod 3.21 is hinged to the bottom surface of the cover plate 2, and the bottom end of the connecting rod 3.21 is hinged to the middle position of the movable arm 3.22. The inner end of the movable arm 3.22 is hinged to the mounting plate 3.3, and a top block 3.23 is provided at the outer end of the movable arm 3.22. When the driving rod of the driving hydraulic cylinder 3.1 is retracted, the movable arm 3.22 is driven to expand, so that the top block 3.23 at the outer end of the movable arm 3.22 presses against the bottom surface of the flange inner ring 6.1 on the inner wall of the upper end of the steel pipe pile 6 (see attached Figure 2 ).

[0036] Furthermore, a limit frame 5 is provided on the bottom surface of the center position of the cover plate 2. The limit frame 5 has two functions: first, a guide hole is provided at the center position of the bottom of the limit frame 5, and a guide sleeve is installed in the guide hole. The driving rod of the driving hydraulic cylinder 3.1 is installed through the guide sleeve, thereby playing a stable guiding role for the driving rod of the driving hydraulic cylinder 3.1; second, the movement position of the mounting plate 3.3 is limited by the limit frame.

[0037] Furthermore, a hatch 1.4 is provided on the top of the intermediate compartment 1.2 to facilitate access to the intermediate compartment 1.2 for maintenance of the driving hydraulic cylinder 3.1. A cable hole 1.5 is also provided on the side wall of the intermediate compartment 1.2 for leading out the cable of the driving hydraulic cylinder 3.1.

[0038] A through hole is provided on the cover plate 2, and a through hole is also provided on the side wall of the intermediate compartment 1.2 of the cover body 1. The through hole of the cover plate 2 is connected with the through hole on the side wall of the intermediate compartment 1.2 through a connecting pipe to form a water permeable channel 7. Furthermore, the number of the water permeable channels 7 is multiple, preferably 5-8, and is evenly distributed around the circumference; an adaptive closing valve 8 is respectively provided in each water permeable channel 7.

[0039] The self-adaptive closing valve 8 can self-adaptively control the conduction state of the permeable channel 7 according to the sinking state of the steel pipe pile. Figure 3 The adaptive closing valve 8 includes a valve wall 8.1, a tapered valve core 8.2 mounted within the valve wall 8.1, a return spring 8.3, and a support plate 8.4. The front end of the valve wall 8.1 is an open tapered wall 8.11, and the rear end is a cylindrical wall 8.12. The support plate 8.4 is a rectangular plate fixedly connected to the cylindrical wall 8.12 of the valve wall 8.1. The tapered valve core 8.2 is mounted on the support plate 8.4 via a return spring 8.3. When the return spring 8.3 is in its natural state, the tapered valve core 8.2 is separated from the opening of the tapered wall 8.11. In this state, water can flow through the adaptive closing valve 8 and the water permeable channel 7. Furthermore, the tapered direction of the tapered valve core 8.2 is arranged from the inside to the outside along the water permeable channel 7.

[0040] The working principle of the adaptive closing valve 8 is as follows: after the anti-slip device is installed, during the vibration sinking process of the steel pipe pile 6, when the steel pipe pile sinks at a normal speed, the water inside the steel pipe pile 6 can be discharged at a low speed through the adaptive closing valve 8 and the water permeable channel 7; when the steel pipe pile slips, the water pressure inside the steel pipe pile 6 suddenly increases, and the speed of the discharged water increases greatly. Under the action of the continuous and rapid outflow of water, the conical valve core 8.2 is pushed to overcome the resistance of the return spring 8.3 and close the opening of the conical wall 8.11 (see Appendix). Figure 4 The state shown in the figure) effectively closes the adaptive closing valve 8 and the permeable channel 7, so that the water pressure in the steel pipe pile 6 increases, and the resistance at the top of the pile increases, which will effectively prevent the pile from slipping.

[0041] The buffer airbag device 9 is arranged at the bottom of the cover plate 2. The buffer airbag device 9 includes a mounting frame 9.1, a baffle 9.2 and a buffer airbag 9.3. The mounting frame 9.1 is connected to the bottom of the cover plate 2. The baffle 9.2 is horizontally arranged on the mounting frame 9.1 and is located below the internal locking mechanism 3 to avoid obstructing the action of the internal locking mechanism 3. The buffer airbag 9.3 is installed inside the mounting frame below the baffle 9.2. When in use, the cushioning airbag 9.3 floats on the bottom surface of the baffle 9.2 under the buoyancy of the water in the steel pipe pile 6 and the blocking effect of the baffle 9.2. During the normal vibration and sinking process of the steel pipe pile 6, the water pressure in the steel pipe pile 6 increases correspondingly each time the vibrating hammer strikes. Therefore, the cushioning airbag 9.3 in the steel pipe pile 6 will be compressed to a certain extent by the water pressure each time the vibrating hammer strikes (that is, the volume of the cushioning airbag 9.3 is compressed and becomes smaller). Since the volume of the cushioning airbag is compressed, a part of the space in the steel pipe pile 6 is vacated, and this space will be filled with water, thereby reducing the water pressure in the steel pipe pile 6, that is, reducing the obstruction of the water in the steel pipe pile to the sinking of the steel pipe pile, making it easier for the steel pipe pile to sink under the hammering action of the vibrating hammer, thereby ensuring the hammering effect.

[0042] The method of using the steel pipe pile anti-slip device with a cushioning airbag of the present invention is as follows:

[0043] Step 1: Sleeve the lower outer sleeve 1.1 of the steel pipe pile anti-slip device onto the upper end of the steel pipe pile 6, then control the driving rod of the driving hydraulic cylinder 3.1 of the internal locking mechanism 3 to retract, driving the six groups of force arm mechanisms 3.2 to expand outward and upward, so that the six groups of force arm mechanisms press against the bottom surface of the flange inner ring 6.1 on the inner wall of the upper end of the steel pipe pile 6, so that the flange inner ring 6.1 on the inner wall of the upper end of the steel pipe pile 6 is clamped between the cover plate 2 and the force arm mechanisms 3.2;

[0044] Step 2: Install a vibrating hammer device on the upper cylinder 1.3 of the steel pipe pile anti-slip device, and fill the steel pipe pile 6 with water through the water permeable channel 7 and the adaptive closing valve 8;

[0045] Step 3: Start the vibrating hammer device to vibrate and sink the steel pipe pile 6. During the vibrating and sinking process of the steel pipe pile 6, when the steel pipe pile sinks at a normal speed, the water inside the steel pipe pile 6 can be discharged at a low speed through the adaptive closing valve 8 and the water permeable channel 7. In addition, each time the vibrating hammer device strikes, the buffer air bag 9.3 inside the steel pipe pile 6 is compressed, reducing the water pressure inside the steel pipe pile, thereby reducing the obstruction of the water inside the steel pipe pile to the sinking of the steel pipe pile, thereby ensuring the hammering effect. When the steel pipe pile slips, the water pressure inside the steel pipe pile 6 suddenly increases, and the speed of the water discharged is greatly increased. Under the action of the continuous and rapid water flow, the conical valve core 8.2 is pushed to overcome the resistance of the return spring 8.3 to close the opening of the conical wall 8.11, thereby effectively closing the adaptive closing valve 8 and the water permeable channel 7, so that the water pressure inside the steel pipe pile 6 increases, and then the resistance at the top of the pile increases, which will effectively prevent the pile from slipping.

[0046] Step 4: After the steel pipe pile 6 is vibrated and sunk to the specified depth, the driving rod of the driving hydraulic cylinder 3.1 of the internal locking mechanism 3 is controlled to extend, driving the 6 groups of force arm mechanisms 3.2 to be retracted, and then the steel pipe pile anti-slip device and the vibrating hammer device are lifted up together by the pull rope to achieve recycling and reuse.

[0047] The above is an exemplary description of the present invention. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by other skilled in the art without expending creative labor falls within the scope of protection of the present invention.

Claims

1. A steel pipe pile anti-slip device with a cushioning airbag, characterized by: It includes a cover body, a cover plate arranged in the cover body, an internal locking mechanism and a buffer airbag device; The cover body includes, from bottom to top, a lower outer sleeve, an intermediate cabin, and an upper cylinder, wherein the lower outer sleeve is used to be sleeved on the steel pipe pile to be constructed, the cover plate is arranged inside the cover body and located on the top of the lower outer sleeve, and a sealing ring is provided on the inner wall of the lower outer sleeve; the intermediate cabin is located above the cover plate, and the upper cylinder is located above the intermediate cabin, and the upper end of the upper cylinder is used to install a vibrating hammer device; The internal locking mechanism includes a driving hydraulic cylinder and multiple groups of force arm mechanisms driven by the driving hydraulic cylinder. The driving hydraulic cylinder is fixedly installed in the middle compartment of the cover body, and the driving rod of the driving hydraulic cylinder downwardly penetrates the cover plate. The driving hydraulic cylinder can synchronously drive the multiple groups of force arm mechanisms to open outward and upward, so that the force arm mechanisms press against the bottom surface of the inner ring of the flange on the inner wall of the upper end of the steel pipe pile, so that the inner ring of the flange on the inner wall of the upper end of the steel pipe pile is clamped between the cover plate and the force arm mechanisms. Through holes are provided on the cover plate and the side walls of the intermediate compartment. The through holes of the cover plate are connected to the through holes on the side walls of the intermediate compartment via connecting pipes to form a water permeable channel. An adaptive closing valve is provided in the water permeable channel. The adaptive closing valve can adaptively control the conduction state of the water permeable channel according to the sinking state of the steel pipe pile. The adaptive closing valve includes a valve wall and a conical valve core installed inside the valve wall, a return spring, and a support plate. The front end of the valve wall is an open conical wall and the rear end is a cylindrical wall. The support plate is fixedly connected to the cylindrical wall of the valve wall. The conical valve core is installed on the support plate via a return spring. When the return spring is in a natural state, the conical valve core and the opening of the conical wall are separated. The buffer airbag device is arranged at the bottom of the cover plate, and the buffer airbag device includes a mounting frame, a baffle and a buffer airbag. The mounting frame is connected to the bottom of the cover plate, the baffle is arranged on the mounting frame and is located below the internal locking mechanism, and the buffer airbag is installed inside the mounting frame below the baffle.

2. The anti-slip device for steel pipe piles with a cushioning airbag according to claim 1 is characterized in that: A shaft sleeve for mounting a driving rod of a hydraulic cylinder is provided at the center of the cover plate, and the driving rod is installed through the shaft sleeve.

3. The anti-slip device for steel pipe piles with a cushioning airbag according to claim 1 is characterized in that: A mounting plate is fixedly installed at the bottom of the driving rod of the driving hydraulic cylinder. Each set of force arm mechanisms includes a connecting rod and a movable bent arm. The top end of the connecting rod is hinged to the bottom surface of the cover plate, and the bottom end of the connecting rod is hinged to the middle position of the movable bent arm. The inner end of the movable bent arm is hinged to the mounting plate, and a top block is provided at the outer end of the movable bent arm. When the driving rod of the driving hydraulic cylinder contracts, the movable bent arm is driven to expand, so that the top block at the outer end of the movable bent arm presses against the bottom surface of the inner ring of the flange on the inner wall of the upper port of the steel pipe pile.

4. The anti-slip device for steel pipe piles with a cushioning airbag according to claim 1, characterized in that: A limit frame is also provided on the bottom surface at the center position of the cover plate, and a guide hole is provided at the center position of the bottom of the limit frame. A guide sleeve is installed in the guide hole, and the driving rod of the driving hydraulic cylinder is installed through the guide sleeve.

5. The anti-slip device for steel pipe piles with a cushioning airbag according to claim 1 is characterized in that: A hatch is provided on the top of the middle cabin.

6. The anti-slip device for steel pipe piles with a cushioning airbag according to claim 1, characterized in that: A cable hole is also provided on the side wall of the middle compartment for leading out the cable that drives the hydraulic cylinder.

7. The method for using the anti-slip device for steel pipe piles with a cushioning airbag according to claim 1, characterized in that: Step 1: Sleeve the lower outer sleeve of the steel pipe pile anti-slip device onto the upper end of the steel pipe pile, and then control the driving rod of the driving hydraulic cylinder of the internal locking mechanism to retract, so that the inner ring of the flange on the inner wall of the upper end of the steel pipe pile is clamped between the cover plate and the lever arm mechanism; Step 2: Install a vibrating hammer device on the upper cylinder of the steel pipe pile anti-slip device, and fill the steel pipe pile with water through the permeable channel and the adaptive closing valve; Step 3: Start the vibrating hammer device to vibrate and sink the steel pipe pile. During the vibration sinking process of the steel pipe pile, when the steel pipe pile sinks at a normal speed, the water inside the steel pipe pile can be discharged at a low speed through the adaptive closing valve and the water permeable channel. In addition, each time the vibrating hammer device strikes the steel pipe pile, the buffer air bag inside the steel pipe pile is compressed, which can reduce the obstruction of the water inside the steel pipe pile to the sinking of the steel pipe pile. When the steel pipe pile slips, the water pressure inside the steel pipe pile suddenly increases, and the speed of the water discharged is greatly increased. Under the action of the continuous and rapid water flow, the conical valve core is pushed to overcome the resistance of the return spring to close the opening of the conical wall, thereby closing the adaptive closing valve and the water permeable channel, so that the water pressure inside the steel pipe pile increases, effectively preventing the pile from slipping. Step 4: After the steel pipe pile is vibrated and sunk to the specified depth, the driving rod of the hydraulic cylinder that controls the internal locking mechanism is extended, the driving arm mechanism is retracted, and then the steel pipe pile anti-slip device and the vibrating hammer device are lifted together by the pull rope.

Images