Reverse circulation hole cleaning super-long underwater rock-socketed pile foundation and construction method

Abstract

The construction method comprises the steps of reinforcement cage machining, drilling and reinforcement cage lowering, guide pipe installation, hole bottom sediment suction, concrete pouring, post-grouting zero sediment construction and the like, a reinforcement cage adjustable lifting appliance is composed of double-spliced channel steel, a U-shaped plate, a double-end stud, a nut and the like, it is guaranteed that the reinforcement cage does not deform during lifting, and the construction process is simple and convenient. The reinforcement cage supporting ring is formed by assembling a plurality of supporting blocks, nuts, supporting rods and the like and is used for supporting a reinforcement cage orifice, the automatic guide pipe lifting device forms movable lifting equipment through a plurality of hydraulic systems and is used for lifting a guide pipe, and the simple screening machine is matched with the vertical immersed pump to complete secondary hole cleaning. And zero sediment at the bottom of the pile is realized through a double-control grouting pipe in post-grouting construction. The method has the advantages that the construction quality is good, the hole cleaning efficiency is high, the reinforcement cage is convenient to construct, and the guide pipe is convenient to put down, and good technical and economic benefits can be obtained when the method is applied to actual engineering.

Description

Technical Field

[0001] The invention relates to the field of bridges, and in particular to a reverse circulation hole cleaning ultra-long underwater rock-embedded pile foundation and a construction method. Background Art

[0002] The complex changes in the environment bring certain difficulties to the construction of super-long pile foundations. The conventional hole cleaning construction technology has a weak slag cleaning effect and does not meet the design requirements. Secondly, the conventional steel cage construction technology is not suitable for the construction process of lifting and lowering super-long steel cages, which can easily cause deformation of the steel cage. Similarly, the lowering of the conduit is also difficult. In particular, there is still a certain amount of sediment at the bottom of the pile after the pile is formed. If effective measures are not taken, it is easy to cause problems such as instability of the pile body and decreased bearing capacity of the pile body. Therefore, it is particularly important to explore an efficient super-long submerged rock-embedded pile foundation construction method in a complex environment.

[0003] In summary, in view of the above existing problems, a reverse circulation hole cleaning ultra-long underwater rock-embedded pile foundation and its construction method are proposed from the aspects of steel cage hoisting, conduit installation, hole cleaning, post-grouting and slag cleaning. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems existing in the prior art and provide a reverse circulation hole cleaning ultra-long underwater rock-embedded pile foundation and a construction method.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: The reverse circulation hole cleaning super-long underwater rock-embedded pile foundation construction method comprises the following steps:

[0006] Step 1: Steel Cage Processing

[0007] The first grouting pipe and the second grouting pipe are installed while the steel cage is being processed. The first grouting pipe and the second grouting pipe will be lowered into the pile hole together with the steel cage. The bottom of the grouting pipe is shorter than the steel cage during installation.

[0008] Step 2: Drilling and lowering the steel cage

[0009] After the steel casing is installed, the hole is drilled and cleaned for the first time, and then the steel cage support ring is installed on the top of the steel casing. The first section of the steel cage is lifted by the steel cage adjustable hoist, and the lifting bar is installed on the double-jointed channel steel of the steel cage adjustable hoist through the support plate and the third nut.

[0010] After the first section of the steel cage is put into the hole, adjust the support rod of the steel cage support ring to the appropriate position to support and limit the steel cage. Then hoist the second section of the steel cage and connect it to the first section of the steel cage. Continue to lower the steel cage and temporarily fix it again. Repeat the steps until the connection and fixation of the steel cage are completed.

[0011] Step 3: Catheter Installation

[0012] Install the automatic catheter lifting device above the hole mouth, then align the first section of catheter with the catheter entrance, start the automatic lifting position, adjust the lifting device and the arc-shaped support block on the lifting device until the catheter is firmly clamped, and then start the electric hydraulic jack to slowly lower the first section of catheter, and then connect the second section of catheter to continue to slowly lower it, and repeat the steps until the catheter is lowered to the bottom of the hole.

[0013] Step 4: Suction the sediment at the bottom of the hole

[0014] A high-pressure rubber reducer is used to connect the vertical submersible pump to the conduit. The slurry outlet of the vertical submersible pump is connected to the slurry inlet of the coarse screen through a conveying pipe. The slurry outlet of the coarse screen is connected to the slurry inlet of the cyclone. At the same time, a hose is connected to the mud outlet of the coarse screen. The slurry hose outlet is placed in a mud collection box to facilitate the collection of coarse screening residues. The cyclone is installed on a simple square bracket to form a simple screening machine.

[0015] The mud mixture at the bottom of the hole is directly pumped out through the conduit and sent to the coarse screen for coarse screening, and then sent to the cyclone. The mud residue is screened out by the centrifugal principle and flows into the mud residue collection box. The mud flows into the mud pool from the cyclone outlet to complete the secondary hole cleaning.

[0016] Step 5: Concrete pouring

[0017] After the hole is cleaned, the vertical submersible pump and the cylindrical bracket are moved away from the hole mouth, and then the conduit is connected to the pouring hopper, and then concrete pouring is carried out.

[0018] Step 6: Post-grouting zero sedimentation construction

[0019] After the pile reaches a certain strength, start drilling from the port at the bottom of the grouting pipe to complete the drilling section. Then, high-pressure water is sent from the first grouting pipe to the bottom of the pile, and the mud residue at the bottom of the pile is pressed into the bottom port of the second grouting pipe and flows out from the top until the outflow is clear water. Then stop the operation. Then inject slurry from the first grouting pipe, press the clear water at the bottom of the pile into the second grouting pipe and discharge it until the outflow of the grouting pipe is slurry, and then block the second grouting pipe to fill the pile bottom and soil cracks with slurry.

[0020] Preferably, two channel steels are connected by several connecting plates to assemble and support double channel steels, and the U-shaped plate uses the first stud, the second stud and the corresponding first nut and the second nut to connect the upper and lower vertical double channel steels, finally forming an adjustable hanger for the steel cage.

[0021] Furthermore, the first stud is inserted into the top hole in the middle of the U-shaped plate, passes through the joint of the two intersecting double-jointed channel steels, passes out of the bottom double-jointed channel steel, and is fixed up and down with the first nut. The second stud is inserted into the side hole of the U-shaped plate, passes through the joint of the bottom double-jointed channel steel, and is fixed with the second nut.

[0022] Preferably, the support blocks are assembled into a whole by connecting panels and rivets. A notch is set in each support block. The screw rod is passed through the notch as a support rod for supporting the steel cage. The support rod is fixed to the notch of the support block by internal and external nuts and gaskets, finally forming a steel cage support ring.

[0023] It is worth noting that through the flexible assembly of the support rods, an appropriate amount of support rods can be assembled according to the size and density of the steel cage. At the same time, the setting of the slots can slightly adjust the horizontal position of the support rods by sliding to ensure effective support for the steel cage.

[0024] The automatic pipe lifting device includes a base plate with a slide rail and a lifting device. The lifting device is installed on the slide rail of the base plate and can slide to adjust the position. The electric hydraulic jack and the small jack in the lifting device are used together to adjust the position up, down, left and right to meet the construction requirements of lowering and lifting the pipe.

[0025] Preferably, the lifting device is composed of an electric hydraulic jack, a fixed block, a small jack, a telescopic rod, a fixed plate, a push rod and an arc-shaped support block. The electric hydraulic jack is installed at the bottom of the fixed block and is installed on the slide rail of the base plate as a support leg. Telescopic rods are installed at the four corners between the vertical surface of the fixed block and the fixed plate, and a small jack is installed in the middle. The small jack drives the telescopic rod as a support rod to extend and retract forward and backward to accurately clamp the catheter. A push rod is installed on one side of the fixed plate, and an arc-shaped support block is installed on the push rod to clamp the catheter. At the same time, an anti-skid pad is installed on the arc-shaped support block to increase the friction between the arc-shaped support block and the catheter to prevent the catheter from sliding down.

[0026] Specifically, the cylindrical bracket is installed on the bottom plate, the vertical submersible pump is installed on the cylindrical bracket, a high-pressure rubber reducer is installed on the top of the conduit, and the other end of the biting rubber reducer is connected to the vertical submersible pump.

[0027] Furthermore, a first small diameter flange is installed at the small diameter joint of the high-pressure rubber reducer, and a first large diameter flange is installed at the large diameter joint, and then they are respectively connected to the second small diameter flange on the vertical submersible pump and the second large diameter flange on the conduit.

[0028] Preferably, the square bracket is installed above the mud collection box, and the cyclone is installed on the square bracket and connected to the coarse screen through a pipeline, so that the mud mixture after coarse screening enters the cyclone and then enters the mud pool through the output pipe.

[0029] Specifically, the first grouting pipe and the second grouting pipe are installed on the steel cage and lowered into the hole together with the steel cage. After the pile foundation reaches a certain strength, a hole is drilled through the bottom of the grouting pipe to drill through the pile foundation. Subsequently, high-pressure water is injected through the first grouting pipe, and the bottom sediment is washed by high-pressure hole washing until clean water flows out of the second grouting pipe. The designed slurry is sent to the bottom of the pile from the first grouting pipe, and the water at the bottom of the pile is discharged from the second grouting pipe. When the slurry flows out of the second grouting pipe, there is no water at the bottom of the pile. Then the second grouting pipe is blocked and the bottom of the pile is filled with slurry through high-pressure grouting.

[0030] It is worth noting that high-pressure water is first used to flush the mud and residue between the pile bottom and the soil, and then grouting is performed to fill the gaps and cracks at the pile bottom, so that the pile body and the soil are integrated into a whole, effectively improving the bearing capacity of the pile foundation.

[0031] The reverse circulation hole cleaning super-long underwater rock-embedded pile foundation is manufactured by using the reverse circulation hole cleaning super-long underwater rock-embedded pile foundation construction method.

[0032] Compared with the existing technology, the working principle and beneficial effects are as follows:

[0033] 1. The present invention adopts a steel cage support ring and an adjustable steel cage hoist, which can ensure that the steel cage does not deform during the lifting and lowering process, and at the same time improves the construction efficiency of the steel cage.

[0034] 2. The present invention provides an automatic catheter lifting device for catheter installation, and the catheter is lowered or lifted by the lifting device, thereby improving the installation and removal speed of the catheter.

[0035] 3. The present invention adopts a vertical submersible pump instead of a large mud pump, which has a simple configuration, small footprint and convenient operation. At the same time, the mud is separated by a simple mud purification device, which reduces the slag content and the amount of repeated slag discharge.

[0036] 4. The present invention adopts high-pressure hole washing double-control post-grouting zero-sedimentation construction technology, which improves the bearing capacity of the pile foundation by high-pressure water hole washing and then grouting reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional diagram of the adjustable hanger for the steel cage of the present invention;

[0038] Figure 2 It is a schematic diagram of double-joined channel steel splicing of the present invention;

[0039] Figure 3 is a plan view of a steel cage support ring of the present invention;

[0040] Figure 4 is a three-dimensional diagram of a steel cage support ring of the present invention;

[0041] Figure 5is a three-dimensional diagram of the automatic catheter lifting device of the present invention;

[0042] Figure 6 It is a plan view of the automatic catheter lifting device of the present invention;

[0043] Figure 7 It is a schematic diagram of the reverse circulation hole cleaning of suction mud of the present invention;

[0044] Figure 8 It is a schematic diagram of the connection between the conduit and the vertical submersible pump of the present invention;

[0045] Fig. 9 It is a schematic diagram of post-grouting and slag removal construction of the present invention.

[0046] In the figure, 1. adjustable hanger for steel cage; 2. channel steel; 3. U-shaped plate; 4. connecting plate; 5. hanging rod; 6. support plate; 7. first stud; 8. second stud; 9. first nut; 10. second nut; 11. third nut; 12. double-jointed channel steel; 13. steel cage support ring; 14. support rod; 15. support block; 16. nut; 17. gasket; 18. rivet; 19. connecting panel; 20. notch; 21. automatic lifting device for conduit; 22. bottom plate; 23. slide rail; 24. lifting equipment; 25. electric hydraulic jack; 26. fixing block; 27. small jack ; 28. Telescopic rod; 29. ​​Fixed plate; 30. Arc support block; 31. Anti-slip mat; 32. Push rod; 33. Conduit inlet; 34. Vertical submersible pump; 35. Cylindrical bracket; 36. Conduit; 37. High-pressure rubber reducer; 38. Coarse screen; 39. Hose; 40. Square bracket; 41. Cyclone; 42. Simple screening machine; 43. Mud collection box; 44. First small diameter flange; 45. Second small diameter flange; 46. First large diameter flange; 47. Second large diameter flange; 48. First grouting pipe; 49. Second grouting pipe; 50. Grouting pipe bottom; 51. Drilling section. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0048] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by terms such as "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0049] Example 1

[0050] like Figure 1-9 As shown, the reverse circulation hole cleaning super-long underwater rock-embedded pile foundation construction method includes the following steps:

[0051] Step 1: Steel Cage Processing

[0052] The first grouting pipe 48 and the second grouting pipe 49 are installed while the steel cage is being processed. The first grouting pipe 48 and the second grouting pipe 49 will be lowered into the pile hole together with the steel cage. The bottom of the grouting pipe is shorter than the steel cage during installation.

[0053] Step 2: Drilling and lowering the steel cage

[0054] After the steel casing is installed, rotary drilling is carried out, and the hole is cleaned for the first time, and then the steel cage support ring 13 is installed on the top of the steel casing. The first section of the steel cage is lifted by the steel cage adjustable hanger 1, and the hanging rod 5 is installed on the double-jointed channel steel 12 of the steel cage adjustable hanger 1 through the support plate 6 and the third nut 11.

[0055] After the first section of the steel cage is put into the hole, the support rod 14 of the steel cage support ring 13 is adjusted to a suitable position to support and restrict the steel cage. Then the second section of the steel cage is hoisted and connected to the first section of the steel cage, and the steel cage is lowered and temporarily fixed again. Repeat the steps until the connection and fixation of the steel cage are completed.

[0056] Specifically, the adjustable steel cage hanger 1 includes a double channel steel 12, a U-shaped plate 3, studs, and nuts. Two channel steels 2 are connected and assembled to support the double channel steel 12 through a plurality of connecting plates 4, and the U-shaped plate 3 uses a first stud 7, a second stud 8 and corresponding first nuts 9 and second nuts 10 to connect the vertical double channel steels 12.

[0057] Among them, Figure 2 As shown, the first stud 7 penetrates into the top hole in the middle of the U-shaped plate 3, passes through the joint of the two intersecting double-jointed channel steels 12, passes out from the bottom double-jointed channel steel 12, and is fixed up and down with the first nut 9. The second stud 8 penetrates into the side hole of the U-shaped plate 3, passes through the joint of the bottom double-jointed channel steel 12, and is fixed with the second nut 10.

[0058] Specifically, the steel cage support ring 13 includes a plurality of support blocks 15, nuts 16, struts 14, etc. The support blocks 15 are assembled into a whole by connecting panels 19 and rivets 18. A notch 20 is set in each support block 15. The screw rod 14 used as the strut 14 supporting the steel cage is passed through the notch 20, and the strut 14 is fixed to the notch 20 of the support block 15 by means of inner and outer nuts 16 and gaskets 17.

[0059] It is worth noting that, through the flexible assembly of the support rods 14, an appropriate amount of support rods 14 can be assembled according to the size and density of the steel cage. At the same time, the setting of the notches 20 can fine-tune the horizontal position of the support rods 14 by sliding, ensuring effective support for the steel cage.

[0060] Step 3: Catheter Installation

[0061] Install the automatic catheter lifting device 21 above the hole mouth, then align the first section of the catheter 36 with the catheter inlet 33, start the automatic lifting position, adjust the lifting device 24 and the arc-shaped support block 30 on the lifting device 24 until the catheter 36 is firmly clamped, and then start the electric hydraulic jack 25 to slowly lower the first section of the catheter 36, and then connect the second section of the catheter 36 to continue to slowly lower it, and repeat the steps until the catheter 36 is lowered to the bottom of the hole.

[0062] Specifically, the automatic pipe lifting device 21 includes a base plate 22 with a slide rail 23 and a lifting device 24. The lifting device 24 is installed on the slide rail 23 of the base plate 22 and can slide to adjust the position. The electric hydraulic jack 25 and the small jack 27 in the lifting device 24 are used together to adjust the position up, down, left, and right to meet the construction requirements of lowering and lifting the pipe 36.

[0063] Preferably, the lifting device 24 is composed of an electric hydraulic jack 25, a fixed block 26, a small jack 27, a telescopic rod 28, a fixed plate 29, a push rod 32 and an arc-shaped support block 30. The electric hydraulic jack 25 is installed at the bottom of the fixed block 26 and is installed on the slide rail 23 of the bottom plate 22 as a support leg. The telescopic rod 28 is installed at the four corners between the vertical surface of the fixed block 26 and the fixed plate 29, and the small jack 27 is installed in the middle. The small jack 27 drives the telescopic rod 28 as the support rod 14 to extend and retract forward and backward to accurately clamp the catheter 36. The push rod 32 is installed on one side of the fixed plate 29, and the arc-shaped support block 30 is installed on the push rod 32 to clamp the catheter 36. At the same time, the anti-skid pad 31 is installed on the arc-shaped support block 30 to increase the friction between the arc-shaped support block 30 and the catheter 36 to prevent the catheter 36 from sliding down.

[0064] Step 4: Suction the sediment at the bottom of the hole

[0065] A high-pressure rubber reducer 37 is used to connect the vertical submersible pump 34 to the conduit 36. The slurry outlet of the vertical submersible pump 34 is connected to the slurry inlet of the coarse screen 38 through a conveying pipe. The slurry outlet of the coarse screen 38 is connected to the slurry inlet of the cyclone 41. At the same time, a hose 39 is connected to the mud outlet of the coarse screen 38. The outlet of the slurry hose 39 is placed in a mud collection box 43 for easy collection of coarse screening residues. The cyclone 41 is installed on a simple square bracket 40 to form a simple screening machine 42.

[0066] The mud mixture at the bottom of the hole is directly pumped out through the conduit 36 ​​and sent to the coarse screen 38 for coarse screening, and then sent to the cyclone 41. The mud residue is screened out by the centrifugal principle and flows into the mud residue collection box 43. The mud flows into the mud pool from the slurry outlet of the cyclone 41 to complete the secondary hole cleaning.

[0067] Specifically, the cylindrical bracket 35 is installed on the bottom plate 22 , the vertical submersible pump 34 is installed on the cylindrical bracket 35 , a high-pressure rubber reducer 37 is installed on the top of the conduit 36 ​​, and the other end of the biting rubber reducer is connected to the vertical submersible pump 34 .

[0068] Among them, the first small diameter flange 44 is installed at the small diameter joint of the high-pressure rubber reducer 37, and the first large diameter flange 46 is installed at the large diameter joint, and then connected to the second small diameter flange 45 on the vertical submersible pump 34 and the second large diameter flange 47 on the conduit 36 ​​respectively.

[0069] Preferably, the simple screening machine 42 includes a square bracket 40, a mud collection box 43, and a hydrocyclone 41. The square bracket 40 is installed above the mud collection box 43, and the hydrocyclone 41 is installed on the square bracket 40 and connected to the coarse screen 38 through a pipeline, so that the coarsely screened mud mixture enters the hydrocyclone 41 and then enters the mud pool through the output pipe.

[0070] Step 5: Concrete pouring

[0071] After the hole is cleaned, the vertical submersible pump 34 and the cylindrical support 35 are moved away from the hole mouth, and then the conduit 36 ​​is connected to the pouring hopper, and then concrete pouring is carried out.

[0072] Step 6: Post-grouting zero sedimentation construction

[0073] After the pile reaches a certain strength, drilling starts from the port at the bottom of the grouting pipe to complete the construction of the drilling section 51. Subsequently, high-pressure water is sent from the first grouting pipe 48 to the bottom of the pile, and the mud residue at the bottom of the pile is pressed into the bottom port of the second grouting pipe 49 and flows out from the top until the outflow is clear water, and then the operation is stopped. Then slurry is injected from the first grouting pipe 48, and the clear water at the bottom of the pile is pressed into the second grouting pipe 49 and discharged until the outflow of the grouting pipe is slurry, and then the second grouting pipe 49 is blocked, so that the slurry fills the bottom of the pile and the cracks in the soil.

[0074] Specifically, the first grouting pipe 48 and the second grouting pipe 49 are installed on the steel cage and lowered into the hole together with the steel cage. After the pile foundation reaches a certain strength, a hole is drilled through the bottom opening 50 of the grouting pipe to drill through the pile foundation. Subsequently, high-pressure water is injected through the first grouting pipe 48, and the bottom sediment is washed by high-pressure hole washing until clear water flows out of the second grouting pipe 49. The designed slurry is sent to the bottom of the pile from the first grouting pipe 48, and the water accumulated at the bottom of the pile is discharged from the second grouting pipe 49. When the slurry flows out of the second grouting pipe 49, there is no water accumulated at the bottom of the pile at this time, and the second grouting pipe 49 is blocked again, and the bottom of the pile is filled with slurry through high-pressure grouting.

[0075] It is worth noting that high-pressure water is first used to flush the mud and residue between the pile bottom and the soil, and then grouting is performed to fill the gaps and cracks at the pile bottom, so that the pile body and the soil are integrated into a whole, effectively improving the bearing capacity of the pile foundation.

[0076] Example 2

[0077] The present invention also discloses a reverse circulation hole cleaning ultra-long submerged rock-embedded pile foundation, which is obtained by the reverse circulation hole cleaning ultra-long submerged rock-embedded pile foundation construction method of embodiment 1.

[0078] The parts not described in detail in the present invention are prior art, so the present invention does not describe them in detail.

[0079] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A method for construction of ultra-long underwater rock-embedded pile foundation with reverse circulation hole cleaning, characterized in that: The following steps are involved: Step 1: Steel Cage Processing The first grouting pipe (48) and the second grouting pipe (49) are installed while the steel cage is being processed. The first grouting pipe (48) and the second grouting pipe (49) are lowered into the pile hole together with the steel cage. When the grouting pipes are installed, the bottoms are shorter than the steel cage. Step 2: Drilling and lowering the steel cage After the steel casing is installed, rotary drilling is performed, and the hole is cleaned for the first time, and then a steel cage support ring (13) is installed on the top of the steel casing; The first section of the steel cage is lifted by using an adjustable steel cage sling (1), and the lifting rod (5) is installed on the double-jointed channel steel (12) of the adjustable steel cage sling (1) through a support plate (6) and a third nut (11); after the first section of the steel cage is inserted into the hole, the support rod (14) of the steel cage support ring (13) is adjusted to a suitable position to support and restrict the steel cage; Then, the second steel cage is hoisted and connected to the first steel cage. The steel cage is lowered further and temporarily fixed again. The operation is repeated until the connection and fixation of the steel cage is completed. Step 3: Catheter Installation Install the automatic catheter lifting device (21) above the hole, then align the first section of the catheter (36) with the catheter inlet (33), start the automatic lifting position (21), adjust the lifting device (24) and the arc-shaped support block (30) on the lifting device (24) until the catheter (36) is firmly clamped, and then start the electric hydraulic jack (25) to slowly lower the first section of the catheter (36), and then connect the second section of the catheter (36) to continue to slowly lower it, and repeat the operation until the catheter (36) is lowered to the bottom of the hole; Step 4: Suction the sediment at the bottom of the hole A high-pressure rubber reducer (37) is used to connect a vertical submersible pump (34) to a conduit (36); the slurry outlet of the vertical submersible pump (34) is connected to the slurry inlet of a coarse screen (38) through a delivery pipe; the slurry outlet of the coarse screen (38) is connected to the slurry inlet of a hydrocyclone (41); a hose (39) is connected to the mud outlet of the coarse screen (38); the outlet of the slurry hose (39) is placed in a mud collection box (43) for easy collection of coarse screening residues; the hydrocyclone (41) is mounted on a simple square bracket (40) to form a simple screening machine (42); The mud mixture at the bottom of the hole is directly drawn out through the conduit (36) and sent to the coarse screen (38) for coarse screening, and then sent to the hydrocyclone (41). The mud residue is screened out by the centrifugal principle and flows into the mud residue collection box (43). The mud flows into the mud pool from the slurry outlet of the hydrocyclone (41), completing the secondary hole cleaning; Step 5: Concrete pouring After the hole is cleaned, the vertical submersible pump (34) and the cylindrical support (35) are moved away from the hole, and the conduit (36) is connected to the pouring hopper, and then concrete pouring is carried out; Step 6: Post-grouting zero sedimentation construction After the pile body reaches a certain strength, drilling is started from the port at the bottom of the grouting pipe to complete the construction of the drilling section (51); Subsequently, high-pressure water is sent from the first grouting pipe (48) into the bottom of the pile, and the mud residue at the bottom of the pile is pressed into the bottom port of the second grouting pipe (49) and flows out from the top, and the operation is stopped after the outflow is clear water; Then, slurry is injected from the first grouting pipe (48), and the clean water at the bottom of the pile is pressed into the second grouting pipe (49) and discharged, until only slurry flows out of the grouting pipe, and then the second grouting pipe (49) is blocked, so that the slurry fills the bottom of the pile and the cracks in the soil.

2. The method for constructing ultra-long underwater rock-embedded pile foundations with reverse circulation hole cleaning according to claim 1 is characterized in that: The adjustable steel cage hanger (1) comprises a double-jointed channel steel (12), a U-shaped plate (3), studs and nuts; two channel steels (2) are connected and assembled to support the double-jointed channel steel (12) through a plurality of connecting plates (4); the U-shaped plate (3) uses a first stud (7), a second stud (8) and corresponding first nuts (9) and second nuts (10) to connect the double-jointed channel steels (12) vertically up and down; The first stud (7) penetrates into the middle top hole of the U-shaped plate (3), passes through the joint seam of two intersecting layers of double-jointed channel steels (12), passes out from the bottom layer of double-jointed channel steels (12), and is fixed up and down with a first nut (9); the second stud (8) penetrates into the side hole of the U-shaped plate (3), passes through the joint seam of the bottom layer of double-jointed channel steels (12), and is fixed with a second nut (10).

3. The method for constructing ultra-long underwater rock-embedded pile foundations with reverse circulation hole cleaning according to claim 1 is characterized in that: The steel cage support ring (13) comprises a plurality of support blocks (15), nuts (16), and support rods (14); the support blocks (15) are connected and assembled into a whole through a connecting panel (19) and a rivet (18); a notch (20) is provided in each support block (15); a screw rod serving as a support rod (14) supporting the steel cage passes through the notch (20); and the support rod (14) is fixed to the notch (20) of the support block (15) through inner and outer nuts (16) and a gasket (17).

4. The method for constructing ultra-long submerged rock-embedded pile foundations in reverse circulation hole cleaning according to claim 1, characterized in that: The lifting device (24) is composed of an electric hydraulic jack (25), a fixing block (26), a small jack (27), a telescopic rod (28), a fixing plate (29), a push rod (32) and an arc-shaped supporting block (30); The electric hydraulic jack (25) is installed at the bottom of the fixed block (26) and is installed on the slide rail (23) of the base plate (22) as a supporting leg; Telescopic rods (28) are installed at the four corners between the vertical surface of the fixing block (26) and the fixing plate (29), and a small jack (27) is installed in the middle. The small jack (27) drives the telescopic rod (28) as the support rod (14) to extend and retract forward and backward to accurately clamp the catheter (36); A push rod (32) is installed on one side of the fixing plate (29), and an arc-shaped support block (30) is installed on the push rod (32) to clamp the catheter (36). At the same time, an anti-skid pad (31) is installed on the arc-shaped support block (30) to increase the friction between the arc-shaped support block (30) and the catheter (36) to prevent the catheter (36) from sliding down.

5. The method for constructing ultra-long underwater rock-embedded pile foundations with reverse circulation hole cleaning according to claim 1 is characterized in that: The cylindrical bracket (35) is installed on the bottom plate (22), the vertical submersible pump (34) is installed on the cylindrical bracket (35), a high-pressure rubber reducer (37) is installed on the top of the conduit (36), and the other end of the biting rubber reducer is connected to the vertical submersible pump (34).

6. The method for constructing ultra-long underwater rock-embedded pile foundations in reverse circulation hole cleaning according to claim 5 is characterized in that: The high-pressure rubber reducer (37) has a first small-diameter flange (44) installed at the small-diameter joint and a first large-diameter flange (46) installed at the large-diameter joint, which are then respectively connected to a second small-diameter flange (45) on the vertical submersible pump (34) and a second large-diameter flange (47) on the conduit (36).

7. The method for constructing ultra-long underwater rock-embedded pile foundations with reverse circulation hole cleaning according to claim 1, characterized in that: The simple screening machine (42) comprises a square bracket (40), a mud collection box (43), and a cyclone (41); the square bracket (40) is installed above the mud collection box (43); the cyclone (41) is installed on the square bracket (40) and connected to the coarse screen (38) through a pipeline, so that the mud mixture after coarse screening enters the cyclone (41) and then enters the mud pool through an output pipe.

8. The method for construction of ultra-long submerged rock-embedded pile foundation in reverse circulation hole cleaning according to any one of claims 1 to 7, characterized in that: The first grouting pipe (48) and the second grouting pipe (49) are installed on the steel cage and lowered into the hole together with the steel cage. After the pile foundation reaches a certain strength, a hole is drilled through the bottom opening (50) of the grouting pipe to drill through the pile foundation; Subsequently, high-pressure water is injected through the first grouting pipe (48) to flush the bottom sediment by high-pressure hole washing until clean water flows out of the second grouting pipe (49); The designed slurry is delivered to the bottom of the pile from the first grouting pipe (48), and the water accumulated at the bottom of the pile is discharged from the second grouting pipe (49); When the grout flows out of the second grouting pipe (49), there is no water accumulation at the bottom of the pile. Then the second grouting pipe (49) is blocked and the bottom of the pile is filled with grout through high-pressure grouting.

9. Reverse circulation hole cleaning super long underwater rock embedded pile foundation, characterized by: The pile is constructed by using the reverse circulation hole cleaning super-long underwater rock-embedded pile foundation construction method described in any one of claims 1 to 8.

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