Self-balancing piling equipment and method for mounting concrete prefabricated pipe pile

Abstract

The invention relates to the technical field of electric power engineering construction, and discloses a self-balancing piling device and method for installing a concrete prefabricated pipe pile, and the self-balancing piling device for installing the concrete prefabricated pipe pile comprises a walking device, a double-pile foundation drilling device, a floating device and an auxiliary balancing device. The walking device comprises an operation room, a crawler belt, an oil tank and a main base. The double-pile foundation drilling device comprises a power hydraulic rod, a displacement hydraulic rod, a connecting box, a front rotary drilling rod and a rear rotary drilling rod; the floating device comprises a floating box, and a pump is arranged at the top of the floating box; the auxiliary balancing device comprises a propeller, a telescopic shaft and a connector; the water surface piling efficiency and safety can be improved, meanwhile, noise and carbon emission of water construction are reduced, and pollution to the environment and ecology is reduced.

Description

Technical Field

[0001] This invention relates to the field of power engineering construction technology, specifically to a self-balancing pile driving device and method for installing precast concrete pipe piles. Background Technology

[0002] Power construction in coastal areas is a crucial link in the industrial process, and the ever-increasing construction of transmission lines affects economic development. However, the complex water conditions in coastal areas inevitably bring many severe challenges to the construction of tower foundations for the expansion of transmission lines and substations, such as rich aquatic ecosystems and a developed and widespread fish farming industry.

[0003] The expansion of power transmission lines and substations is a challenging project that requires significant investment in manpower, resources, and upfront costs. Compared to the convenient plains, the terrain of river and lake areas is unique, and transportation is relatively underdeveloped, making it difficult for large construction equipment to enter the site. At the same time, the pollution generated during construction will also cause serious damage to the local ecological environment.

[0004] Currently, land-based piling machinery has high efficiency because the tracks have high friction with the ground, so mechanical spin is almost non-existent. However, water-based piling vessels cannot perfectly solve the problem of hull spin, resulting in poor efficiency and safety in water-based piling. Furthermore, traditional water-based construction machinery also has problems such as high noise and high carbon emissions, which cause serious environmental and ecological pollution. Summary of the Invention

[0005] This invention provides a self-balancing pile driving device and method for installing precast concrete pipe piles. By adding a walking device to the body and deck of an excavator and using a floating device, the device can move on the water surface. Simultaneously, the device's buoyancy and descent can be controlled according to the water level. During construction, a double-pile drilling device with opposite rotation directions can counteract the reaction force of the soil on the device. Combined with an auxiliary balancing device, torque balance is achieved during construction. This solves the problems of poor pile driving efficiency and safety, and serious environmental and ecological pollution mentioned in the background art.

[0006] This invention provides the following technical solution:

[0007] A self-balancing piling device for installing precast concrete pipe piles includes a traveling device, a dual-pile foundation drilling device, a floating device, and an auxiliary balancing device. The traveling device includes an operator's cab, tracks, an oil tank, and a main base. The dual-pile foundation drilling device includes a power hydraulic rod, a displacement hydraulic rod, a connecting box, a front-mounted rotary drilling rod, and a rear-mounted rotary drilling rod. The floating device includes a pontoon with a pump mounted on top. The auxiliary balancing device includes a propeller, a telescopic shaft, and a connector.

[0008] As a preferred embodiment of the present invention, the operating room is equipped with a control console, the operating room is fixedly connected to the main base, the oil tank is fixedly connected to the operating room, and the two sets of tracks are arranged on both sides of the main base.

[0009] In a preferred embodiment of the present invention, the connecting box is fixedly connected to the bottom of the main base, the displacement hydraulic rods are symmetrically arranged on both sides of the connecting box, the power hydraulic rods are symmetrically fixedly connected to the bottom of the connecting box, the front rotary drilling rod and the rear rotary drilling rod are respectively arranged on the side of the two sets of displacement hydraulic rods near the power hydraulic rod, wherein the front rotary drilling rod and the rear rotary drilling rod are both fixedly connected with helical blades, the ends of the front rotary drilling rod and the rear rotary drilling rod are both connected with helical drill bits, and grouting holes are opened on the side of the front rotary drilling rod and the rear rotary drilling rod near the helical drill bit.

[0010] As a preferred embodiment of the present invention, the pontoons are arranged on both sides of the track, and the side walls of the pontoons are provided with water inlets and water outlets.

[0011] As a preferred embodiment of the present invention, the connector is fixedly connected to the bottom of the float box, and a drive motor is fixedly connected to the end of the connector away from the float box. The telescopic shaft is connected to the output end of the drive motor, and the propeller is fixedly connected to the end of the telescopic shaft away from the drive motor.

[0012] As a preferred embodiment of the present invention, it further includes a mud layer and a rock layer, wherein a helical pile is installed in the mud layer and the rock layer, and a concrete pipe pile clamp is installed on the helical pile by bolts. The concrete pipe pile clamp is connected to the concrete pipe pile by bolts. During operation, the front rotary drilling rod and the rear rotary drilling rod extend into the mud layer and the rock layer through the concrete pipe pile.

[0013] A self-balancing pile driving method for installing precast concrete pipe piles includes the following steps:

[0014] Step 1: Installation of the twin-pile foundation drilling device: Remove the excavator's mechanical arm and install the twin-pile foundation drilling device on the machine body and deck, and install a rotary drilling control system in the operator's cab;

[0015] Step 2: Fabrication of the auger bit: Weld the bottom of the auger bit to the top of the tapered drill bit, and weld the auger blades to the bottom of the pile body;

[0016] Step 3: Making the floating device: Adjust the length, width and height of the pontoon according to the height and length of the track, and the height of the pontoon should be less than the height of the track;

[0017] Step 4: Installation of auxiliary balancing device: Drive the traveling device with the double pile foundation drilling device and floating device into the water, and install the auxiliary balancing device at the bottom of the pontoon.

[0018] Step 5: Construction of helical piles: Using an auxiliary balancing device, the equipment is driven to the construction location. A double pile foundation drilling device is used to drill a hole at the construction location, and concrete is injected into the hole at the same time. The double pile foundation drilling device cuts and mixes the concrete and water to form cement soil.

[0019] Step Six: Operation of the Auxiliary Balancing Device: The thrust generated by the auxiliary balancing device enables the double pile foundation drilling device to achieve torque balance;

[0020] Step 7: Installation of precast concrete pipe piles: After disassembling the clamps of the helical piles, install the clamps of the concrete pipe piles, then install the concrete pipe piles, and start the double pile foundation drilling device to bring the concrete pipe piles to the designated position.

[0021] In step one, the number of power hydraulic rods in the double pile foundation drilling device is four.

[0022] In step two, the outer diameter of the helical blade is 2-3 times the outer diameter of the pile body.

[0023] In step three, the pontoon is a steel cuboid with a width of 1.8m-2m, and the outer surface of the pontoon is coated with anti-corrosion paint.

[0024] Compared with the prior art, the present invention provides a self-balancing piling device and method for installing precast concrete pipe piles, which has the following beneficial effects:

[0025] 1. The self-balancing pile driving equipment and method for installing precast concrete pipe piles can achieve floating and walking through the walking device and floating device. It has the characteristics of stable floating and walking, low construction noise and high pile driving efficiency. At the same time, combined with the floating box water level control technology, it effectively solves the problem of stability of traditional construction vessel pile foundation construction.

[0026] 2. In the self-balancing pile driving equipment and method for installing precast concrete pipe piles, the backfilling process can be avoided through the double pile foundation drilling device and auxiliary balancing device, thereby reducing the ecological impact on the river network and fishpond area, which is conducive to the reproduction and survival of aquatic organisms, improving the ecological value and environmental quality of the area. At the same time, it avoids the self-rotation of the equipment during pile driving, which not only improves the construction efficiency and accuracy, but also improves the relative accuracy of the pile spacing and the verticality of the pile foundation, and ensures the safety of the equipment during operation.

[0027] The parts of the device not described herein are the same as or can be implemented using existing technologies. This invention can improve the efficiency and safety of water surface piling, while reducing noise and carbon emissions from water construction, and reducing pollution to the environment and ecology. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0029] Figure 1 This is a physical drawing of the present invention;

[0030] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0031] Figure 3 This is a schematic diagram of the walking device in this invention;

[0032] Figure 4 This is a schematic diagram of the structure of the double-pile foundation drilling device in this invention;

[0033] Figure 5 This is a schematic diagram of the floating device in this invention;

[0034] Figure 6 This is a schematic diagram of the concrete clamp in this invention;

[0035] Figure 7 This is a schematic diagram of the structure of the helical pile and the precast concrete pipe pile in this invention;

[0036] Figure 8 This is a schematic diagram of the construction process of the present invention.

[0037] In the diagram: 1. Walking device; 2. Double pile foundation drilling device; 3. Floating device; 4. Auxiliary balancing device; 5. Track; 6. Oil tank; 7. Operator's cab; 8. Main base; 9. Power hydraulic rod; 10. Displacement hydraulic rod; 11. Connecting box; 12. Front-mounted rotary drilling rod; 13. Rear-mounted rotary drilling rod; 14. Concrete pipe pile clamp; 15. Bolt; 16. Spiral blade; 17. Spiral drill bit; 18. Grouting hole; 19. Float box; 20. Pump; 21. Inlet; 22. Outlet; 23. Propeller; 24. Telescopic shaft; 25. Connector; 26. Mud layer; 27. Rock layer; 28. Concrete pipe pile. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1:

[0040] Reference Figures 1-8 A self-balancing pile driving device for installing precast concrete pipe piles includes a traveling device 1, a double pile foundation drilling device 2, a floating device 3, and an auxiliary balancing device 4. The traveling device 1 includes an operator's cab 7, tracks 5, an oil tank 6, and a main base 8. The double pile foundation drilling device 2 includes a power hydraulic rod 9, a displacement hydraulic rod 10, a connecting box 11, a front rotary drilling rod 12, and a rear rotary drilling rod 13. The floating device 3 includes a pontoon 19, with a pump 20 mounted on top of the pontoon 19. The auxiliary balancing device 4 includes a propeller 23, a telescopic shaft 24, and a connector 25.

[0041] Reference Figures 2-3 The operator's cab 7 is equipped with a control console and is fixedly connected to the main base 8. The oil tank 6 is fixedly connected to the operator's cab 7, and two sets of tracks 5 are set on both sides of the main base 8.

[0042] In this embodiment, the walking device 1 is a conventional excavator. The excavator's mechanical arm is removed, and four power hydraulic rods 9 are installed on the body and deck and connected to the excavator's power system. A rotary drilling control system is installed in the operator's cab 7 to meet the requirements of rotary drilling. The two tracks 5 are mechanically connected to the floating device 3 on their outer sides. The length of the tracks 5 is twice that of the original tracks, which can make the piling position exactly at the center of the equipment. The fuel tank 6 is a conventional construction machinery fuel tank 6. The tracks 5 enable the piling machinery to travel on complex land terrain.

[0043] Reference Figure 2 and Figure 4 The connecting box 11 is fixedly connected to the bottom of the main base 8. The displacement hydraulic rods 10 are symmetrically arranged on both sides of the connecting box 11. The power hydraulic rods 9 are symmetrically fixedly connected to the bottom of the connecting box 11. The front rotary drilling rod 12 and the rear rotary drilling rod 13 are respectively arranged on the side of the two sets of displacement hydraulic rods 10 near the power hydraulic rods 9. The front rotary drilling rod 12 and the rear rotary drilling rod 13 are both fixedly connected with spiral blades 16. The ends of the front rotary drilling rod 12 and the rear rotary drilling rod 13 are both connected with spiral drill bits 17. The front rotary drilling rod 12 and the rear rotary drilling rod 13 are provided with grouting holes 18 on the side of the front rotary drilling rod 12 and the rear rotary drilling rod 13 near the spiral drill bits 17.

[0044] In this embodiment, the length of the pile body of the front rotary drilling rod 12 and the rear rotary drilling rod 13 is four to eight meters, and the outer diameter is between one hundred and three hundred micrometers. The rotation direction of the front rotary drilling rod 12 is clockwise, and the rotation direction of the rear rotary drilling rod 13 is counterclockwise. This allows the reverse torque generated by the soil during the pile driving process to be canceled out, thereby achieving torque balance in the machinery. The connecting box 11 serves to connect the power hydraulic rod 9 and the displacement hydraulic rod 10. The power hydraulic rod 9 mainly provides downward pressure for the front rotary drilling rod 12 and the rear rotary drilling rod 13. The displacement hydraulic rod 10 plays the role of adjusting the distance between the front rotary drilling rod 12 and the rear rotary drilling rod 13. The spiral blade 16 is used to cut and mix the soil. The grouting hole 18 is used to inject cement slurry into the surrounding soil. During the pile driving process, the spiral blade 16 continuously cuts and mixes the soil so that the spiral pile can easily reach the designated soil. Under the mixing, cement soil is formed until the concrete pipe pile 28 reaches the designated position.

[0045] Reference Figure 2 and Figure 5 The pontoons 19 are located on both sides of the track 5, and the side walls of the pontoons 19 are provided with inlets 21 and outlets 22.

[0046] In this embodiment, the synergistic effect of the float 19, pump 20, inlet 21 and outlet 22 can control the change of water level in the float 19, thereby controlling the floating and sinking of the mechanical equipment, providing additional downward pressure for the piling machinery, and ensuring construction quality.

[0047] Reference Figure 5 The connector 25 is fixedly connected to the bottom of the float box 19. The end of the connector 25 away from the float box 19 is fixedly connected to the drive motor. The telescopic shaft 24 is connected to the output end of the drive motor. The propeller 23 is fixedly connected to the end of the telescopic shaft 24 away from the drive motor.

[0048] In this embodiment, during the drilling process, the drill will generate a torque, and the same soil will generate a reverse torque, causing the upper pile driving equipment to rotate. When the combined operation of the front rotary drilling rod 12 and the rear rotary drilling rod 13 is insufficient to offset the reverse torque generated by the soil, the thrust generated by the propeller 23 can enable the pile driving machinery to achieve torque balance. When this part of the torque is too large, the lever arm can be increased by extending the telescopic shaft 24 to better balance the torque.

[0049] Reference Figures 6-7It also includes mud layer 26 and rock layer 27. Spiral piles are installed in mud layer 26 and rock layer 27. Concrete pipe pile clamps 14 are installed on the spiral piles by bolts 15. Concrete pipe pile clamps 14 are connected to concrete pipe piles 28 by bolts 15. During operation, the front rotary drilling rod 12 and the rear rotary drilling rod 13 extend into mud layer 26 and rock layer 27 through concrete pipe piles 28.

[0050] In this embodiment, the concrete pipe pile 28 uses high-performance concrete, which has significant advantages over ordinary concrete in terms of compressive strength, tensile strength, shear strength, corrosion resistance, and wear resistance. It can reduce the wall thickness of the concrete helical pile, thereby reducing its self-weight and improving construction efficiency. After the injected concrete forms cement soil under the action of the helical blades 16, the clamps connecting the helical piles are removed, and concrete pipe pile clamps 14 are installed at the corresponding positions. The concrete pipe pile 28 is connected by bolts 15, and then the concrete pipe pile 28 is brought to the designated position by the front rotary drilling rod 12 and the rear rotary drilling rod 13.

[0051] In this invention, when performing water surface piling operations, the excavator's mechanical arm is first disassembled, and four power hydraulic rods 9 are installed on the machine body, i.e., the deck, and connected to the excavator's power system. A connecting box 11 is installed between the power hydraulic rods 9, and displacement hydraulic rods 10 are installed at both ends of the connecting box 11. A front rotary drilling rod 12 and a rear rotary drilling rod 13 are installed at the ends of the displacement hydraulic rods 10. The tracks 5 are driven to move the equipment into the water. Under the action of the float box 19, the equipment floats on the water surface and moves to the piling position.

[0052] Subsequently, the front rotary drilling rod 12 and the rear rotary drilling rod 13 drive the spiral blades 16 and the spiral drill bit 17 to drill through the mud layer 26 and the rock layer 27. During the drilling process, the front rotary drilling rod 12 and the rear rotary drilling rod 13 will generate opposite torques, that is, the front rotary drilling rod 12 and the rear rotary drilling rod 13 will counteract the reaction force of the soil on the equipment, thereby achieving torque balance. When the combined operation of the front rotary drilling rod 12 and the rear rotary drilling rod 13 is insufficient to balance the reverse torque generated by the soil, the propeller 23 in the corresponding direction will be driven to rotate. The thrust generated by the propeller 23 will achieve torque balance. When the torque is too large, the lever arm can be increased by extending the length of the telescopic shaft 24 to better balance the torque.

[0053] During the drilling process, high-performance concrete is continuously injected into the surrounding soil through the grouting hole 18. The spiral blade 16 further cuts and mixes the soil to form cement soil. Then, the clamp connecting the spiral pile is disassembled and the concrete pipe pile clamp 14 is installed in the corresponding position. The concrete pipe pile 28 is connected by bolts 15. The front rotary drilling rod 12 and the rear rotary drilling rod 13 are driven to rotate so that the concrete pipe pile 28 reaches the designated position and the piling work is completed.

[0054] Meanwhile, the water level in the float box 19 is controlled by the coordinated action of the float box 19, the pump 20, the inlet 21 and the outlet 22, thereby controlling the floating and sinking of the equipment and providing additional downforce to ensure construction quality.

[0055] Example 2:

[0056] Similar to Example 1, a self-balancing pile driving method for installing precast concrete pipe piles is proposed based on Example 1, including the following steps:

[0057] Step 1: Installation of the double pile foundation drilling device 2: Remove the excavator's mechanical arm and install the double pile foundation drilling device 2 on the machine body and deck. Install a rotary drilling control system in the operator's cab 7.

[0058] In step one, the number of power hydraulic rods 9 in the double pile foundation drilling device 2 is four. By installing the power hydraulic rods 9 on the machine body and deck and connecting them to the excavator's power system, the requirements for pile foundation drilling are met.

[0059] Step 2: Fabrication of the auger bit 17: Fix and weld the bottom of the auger bit 17 to the top of the tapered drill bit, and weld the auger blade 16 to the bottom of the pile body;

[0060] In step two, the outer diameter of the helical blade 16 is 2-3 times the outer diameter of the pile body.

[0061] Step 3: Construction of floating device 3: Adjust the length, width and height of float box 19 according to the height and length of track 5, and the height of float box 19 is less than the height of track 5;

[0062] In step three, the pontoon 19 is a steel cuboid with a width of 1.8m-2m. The outer surface of the pontoon 19 is coated with anti-corrosion paint. The side of the pontoon 19 is provided with a water inlet 21 and a water outlet 22. A pump 20 is installed on the top. The pontoon 19 is connected to both sides of the track 5. The pump 20 uses a high-power motor. The positions of the water inlet 21 and the water outlet 22 can be changed according to the construction environment.

[0063] Step 4: Installation of auxiliary balancing device 4: Drive the traveling device 1, which is equipped with the double pile foundation drilling device 2 and the floating device 3, into the water, and install the auxiliary balancing device 4 at the bottom of the pontoon 19.

[0064] Step 5: Construction of helical piles: Using the auxiliary balancing device 4, the equipment is driven to the construction position. The double pile foundation drilling device 2 is used to drill a hole at the construction position, and concrete is injected into the hole at the same time. The double pile foundation drilling device 2 cuts and mixes the concrete and water to form cement soil.

[0065] During the drilling process, the drill will generate a torque, and the same soil will generate a reverse torque, causing the upper part of the equipment to rotate. By using double piles for bidirectional drilling, the reaction force of the soil on the equipment is offset, so that the equipment can achieve torque balance.

[0066] Step Six: Operation of Auxiliary Balancing Device 4: The thrust generated by the auxiliary balancing device 4 enables the double pile foundation drilling device 2 to achieve torque balance;

[0067] When bidirectional drilling with two piles cannot balance the torque, the thrust generated by the lateral propeller 23 enables the equipment to achieve torque balance. At the same time, the force can be adjusted by adjusting the length of the telescopic shaft 24 to better balance the torque.

[0068] Step 7: Installation of precast concrete pipe piles: After disassembling the clamps of the helical piles, install the concrete pipe pile clamps 14, then install the concrete pipe piles 28, and start the double pile foundation drilling device 2 to bring the concrete pipe piles 28 to the designated position.

[0069] Components not described in detail in this article are existing technologies.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-balancing piling equipment for installing concrete precast pipe pile, comprising a walking device (1), a double-pile pile foundation drilling device (2), a floating device (3) and an auxiliary balancing device (4), characterized in that, the walking device (1) comprises an operating room (7), a track (5), an oil tank (6) and a main base (8); the double-pile pile foundation drilling device (2) comprises a power hydraulic rod (9), a displacement hydraulic rod (10), a connecting box (11), a front rotary drilling rod (12) and a rear rotary drilling rod (13); the floating device (3) comprises a float box (19), and the float box (19) is provided with a pump (20) on the top; the auxiliary balancing device (4) comprises a propeller (23), a telescopic shaft (24) and a connector (25).

2. A self-balancing piling apparatus for installing a concrete precast pipe pile according to claim 1, wherein, The operating room (7) is provided with a control console, the operating room (7) is fixedly connected to the main base (8), the oil tank (6) is fixedly connected to the operating room (7), and two groups of the track (5) are arranged on the two sides of the main base (8).

3. A self-balancing piling apparatus for installing a concrete precast pipe pile according to claim 2, wherein, The connecting box (11) is fixedly connected to the bottom of the main base (8), the displacement hydraulic rods (10) are symmetrically arranged on the two sides of the connecting box (11), the power hydraulic rods (9) are symmetrically fixedly connected to the bottom of the connecting box (11), and the front rotary drilling rods (12) and the rear rotary drilling rods (13) are arranged on the sides, close to the power hydraulic rods (9), of the ends of the two groups of displacement hydraulic rods (10), wherein the front rotary drilling rods (12) and the rear rotary drilling rods (13) are fixedly connected with helical blades (16), the ends of the front rotary drilling rods (12) and the rear rotary drilling rods (13) are connected with spiral drill bits (17), and the sides, close to the spiral drill bits (17), of the front rotary drilling rods (12) and the rear rotary drilling rods (13) are provided with grouting holes (18).

4. A self-balancing piling apparatus for installing a concrete precast pipe pile according to claim 1, wherein, The float box (19) is arranged on the two sides of the track (5), and the side wall of the float box (19) is provided with a water inlet (21) and a water outlet (22).

5. A self-balancing piling apparatus for installing a concrete precast pipe pile according to claim 4, wherein, The connector (25) is fixedly connected to the bottom of the float box (19), one end of the connector (25) away from the float box (19) is fixedly connected with a driving motor, the telescopic shaft (24) is connected to the output end of the driving motor, and the propeller (23) is fixedly connected to the end of the telescopic shaft (24) away from the driving motor.

6. A self-balancing piling apparatus for installing a concrete precast pipe pile according to claim 3, wherein, It also comprises a mud layer (26) and a rock layer (27), a spiral pile is installed at the mud layer (26) and the rock layer (27), a concrete pipe pile clamp (14) is installed on the spiral pile through bolts (15), and a concrete pipe pile (28) is connected to the concrete pipe pile clamp (14) through the bolts (15), wherein the front rotary drilling rods (12) and the rear rotary drilling rods (13) extend into the mud layer (26) and the rock layer (27) through the concrete pipe pile (28) during work.

7. A self-balancing piling method for installing a concrete precast pipe pile, using the self-balancing piling apparatus for installing a concrete precast pipe pile according to claim 6, characterized by, It comprises the following steps: Step one: installation of the double-pile pile foundation drilling device (2): remove the mechanical arm of the excavator, install the double-pile pile foundation drilling device (2) on the machine body and the deck, and install a rotary drilling control system in the operating room (7). Step two: the production of the screw drill bit (17): the bottom of the screw drill bit (17) is fixed and welded with the top of the conical drill bit, and the screw blade (16) is welded at the bottom end of the pile body; Step three: the production of the floating device (3): according to the height and length of the caterpillar (5), the length, width and height of the floating box (19) are adjusted, and the height of the floating box (19) is less than the height of the caterpillar (5); Step four: the installation of the auxiliary balancing device (4): the traveling device (1) of the double-pile pile foundation drilling device (2) and the floating device (3) is driven into the water, and the auxiliary balancing device (4) is installed at the bottom of the floating box (19); Step five: the construction of the screw pile: the equipment is driven to the construction position by the auxiliary balancing device (4), the construction position is drilled by the double-pile pile foundation drilling device (2), and the concrete is injected into the hole at the same time, the double-pile pile foundation drilling device (2) cuts and stirs the concrete and water to form the cement soil; Step six: the operation of the auxiliary balancing device (4): the double-pile pile foundation drilling device (2) reaches torque balance by the thrust generated by the auxiliary balancing device (4); Step seven: the installation of the concrete precast pipe pile: after the clamp of the screw pile is disassembled, the concrete pipe pile clamp (14) is installed, then the concrete pipe pile (28) is installed, and the double-pile pile foundation drilling device (2) is started to make the concrete pipe pile (28) reach the designated position.

8. A self-balancing piling method for installing a concrete precast pipe pile according to claim 7, wherein, In step one, the number of power hydraulic rods (9) in the double-pile pile foundation drilling device (2) is four.

9. A self-balancing piling method for installing a concrete precast pipe pile according to claim 7, wherein, In step two, the outer diameter of the screw blade (16) is 2-3 times the outer diameter of the pile body.

10. A self-balancing piling method for installing a concrete precast pipe pile according to claim 7, wherein, In step three, the floating box (19) is a steel rectangular box with a width of 1.8m-2m, and the outer surface of the floating box (19) is sprayed with anti-corrosion paint.

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