Marine environment underwater high-strength high-performance concrete super-long pile foundation construction method

Abstract

The invention relates to a marine environment underwater high-strength high-performance concrete super-long pile foundation construction method. According to the scheme, the method comprises the following steps that S1, a prefabricated bridge deck drilling platform is built; s2, performing pore-forming construction by using a differential slurry reverse circulation drilling machine; s3, intelligent detection operation of super-long pile foundation hole forming is carried out; s4, a reinforcement cage auxiliary positioning installation platform is erected; and S5, mounting a super-long pile foundation reinforcement cage and performing concrete pouring construction. According to the construction method for the underwater high-strength high-performance concrete super-long pile foundation in the marine environment, the forming speed of a drilling platform is high, a slurry reverse circulation system is easy and convenient to install, the reinforcement cage hoisting precision is high, construction operation is easy and convenient, the construction method has the multiple construction advantages of high quality, high efficiency, high benefits and the like during implementation, and the technical benefits are remarkable.

Description

Technical Field

[0001] The present invention relates to a construction method for super-long piles of high-strength and high-performance underwater concrete in the marine environment, belonging to the technical field of bridge engineering, and is applicable to the construction of underwater bored cast-in-place piles for bridges in the marine environment. Background Art

[0002] With the continuous development of marine resource development and marine infrastructure construction, the construction scales of projects such as large ports, cross-sea bridges, and offshore wind power are increasing day by day, and the requirements for the bearing capacity and stability of piles are also getting higher and higher. Super-long piles can better adapt to complex marine geological conditions, but they also face greater challenges in construction.

[0003] First of all, when the traditional method of building a drilling platform faces the complex conditions of the marine environment, the efficiency is low, the time consumption is long, which has a relatively large impact on the overall progress of the project. Therefore, it is necessary to consider how to quickly and safely install the drilling platform in the unstable marine environment to reduce the impact of adverse marine weather on construction and reduce construction risks. Secondly, due to the obstruction of the underwater drilling platform, it is difficult to lay the slurry inlet pipe under the drilling platform during the hole-forming operation, which will inevitably reduce the pile-forming efficiency. Moreover, once the pressure difference of the traditional slurry non-differential reverse circulation equipment system is insufficient, it is easy to cause the phenomenon of hole collapse. The slurry water level in the casing of the existing reverse circulation drilling rig for water piles is controlled by the slurry surface in the slurry pit, resulting in a high demand for the volume of the slurry pit and being not conducive to efficient operation. In addition, due to the large self-weight of the super-long pile cage, the quality requirements for the lifting points are high, and there are problems such as difficult positioning during the lengthening operation.

[0004] In view of this, there is an urgent need to invent a construction method for super-long piles of high-strength and high-performance underwater concrete in the marine environment with a fast forming speed of the drilling platform, a simple installation of the slurry reverse circulation system, a high lifting accuracy of the steel cage, simple construction operation, and prominent economic and technical benefits. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction method for super-long piles of high-strength and high-performance underwater concrete in the marine environment with a fast forming speed of the drilling platform, a simple installation of the slurry reverse circulation system, a high lifting accuracy of the steel cage, simple construction operation, and prominent economic and technical benefits.

[0006] To achieve the above technical purpose, the present invention adopts the following technical solutions: A construction method for super-long piles of high-strength and high-performance underwater concrete in the marine environment, characterized by including the following steps:

[0007] S1. Construction of drilling platform for prefabricated bridge deck: after measuring and setting out according to the drawings, the platform pile foundation is set up, and the pile top distribution beam is installed on the top of the platform pile foundation, and the Bailey beam limiter is installed on the upper end of the pile top distribution beam. Then, the Bailey beam is installed using the Bailey beam limiter, and the assembled limiter is installed in the reserved groove on the bottom surface of the prefabricated bridge deck; then the prefabricated bridge deck is hoisted and paved, and the spacing between adjacent prefabricated bridge decks is adjusted by using the tensioner during paving;

[0008] S2. Hole-making construction with differential mud reverse circulation drilling rig: After the steel casing is driven at the designed pile position, the reverse circulation drilling rig is installed directly above the steel casing, and the mud trough, the slurry outlet pool and the slurry inlet pool are arranged in sequence from near to far on one side of the reverse circulation drilling rig. The end of the slurry outlet pipe of the reverse circulation drilling rig is overlapped at the upper opening of the slurry inlet pool, and the slurry outlet pool is abutted against the slurry inlet pool. An articulated gate is provided at one end of the slurry outlet pool close to the mud trough. The slurry inlet of the mud trough is located below the articulated gate, and the slurry outlet of the mud trough is located above the steel casing. During the drilling operation, the winch is turned on to open the articulated gate and discharge slurry, forming a mud differential reverse circulation system;

[0009] S3. Hole-forming inspection of super-long pile foundation: After the reverse circulation drilling rig forms a hole, a hanger is installed on the steel casing. The hanger is hung on the upper end of the steel casing. After the ultrasonic probe and the hole-forming camera are initially lowered into the steel casing, a calibration plate is hoisted on the hanger. A limit sleeve is set in the center of the calibration plate. The ultrasonic probe and the hole-forming camera are passed through the limit sleeve, and then lowered for a second time to carry out hole-forming inspection.

[0010] S4. Construction of the steel cage auxiliary positioning and installation platform: After the hole forming test is qualified, a steel cage auxiliary positioning and installation platform is constructed on the precast bridge deck above the pile position. The bottom plate of the steel cage auxiliary positioning and installation platform is fixed to the lifting ring on the precast bridge deck through anchor cables, and an electrically controlled telescopic gear rod is installed on the steel cage auxiliary positioning and installation platform;

[0011] S5. Installation of extra-long pile foundation steel cage and concrete pouring construction: Four lifting ears are welded at equal intervals around the main reinforcement of the upper part of the extra-long pile foundation steel cage, and H-shaped stiffening plates are welded inside the lifting ears. The steel cage is vertically lifted into the hole of the steel casing through the lifting ears; when the upper and lower steel cages are docked, the electrically controlled telescopic gear rod is started to extend the gear rod, and the gear rod extends to the lifting ear on the lower steel cage and temporarily fixes the lower steel cage, and the lower end of the upper steel cage is docked with the upper end of the lower steel cage. After the docking is completed, the gear rod on the electrically controlled telescopic gear rod is retracted, and then the steel cage is continuously lowered, and finally the pile body concrete is poured using a guide tube.

[0012] Preferably, in step S1, a top surface reserved groove is provided on the top surface of the prefabricated bridge deck, a bottom surface reserved groove is provided on the ground of the prefabricated bridge deck, a lifting ring is provided in the top surface reserved groove, an embedded screw is provided in the bottom surface reserved groove, and the embedded screw is connected to the assembled limit piece.

[0013] Preferably, in step S1, tensioning ropes are provided at both ends of the tensioner, hooks are connected to the ends of the tensioning ropes, the hooks are connected to the lifting rings on two adjacent prefabricated bridge panels, and an operating lever is provided on the tensioner; the tensioning ropes at both ends are tightened by operating the operating lever on the tensioner, thereby adjusting the distance between the two adjacent prefabricated bridge panels.

[0014] Preferably, in step S2, a main support and an auxiliary support are installed at the upper end of the pulp discharge pool by high-strength bolts, a winch is arranged on the top of the main support, an auxiliary support top plate is arranged on the upper end of the auxiliary support, a vertically arranged stirring shaft is arranged on the support top plate, a connecting cross bar is arranged between the auxiliary support top plates, a pulley is arranged on the connecting cross bar, and the traction rope of the winch is connected to the hinged gate at the bottom after passing through the pulley.

[0015] Preferably, in step S3, the bracket includes a center ring, and four hanging parts are arranged at equal intervals in the circumferential direction of the center ring, the upper end of the hanging part is hung on the upper end of the steel casing, the bottom of the hanging part is perpendicular to the inner wall of the steel casing and extends to the center ring, the alignment plate is installed on the center ring of the bracket, and a reserved mounting hole for installing a limiting sleeve is provided in the center of the alignment plate, and the limiting sleeve is inserted into the reserved mounting hole.

[0016] Preferably, in step S4, the steel cage auxiliary positioning installation platform includes an outer frame, an inner frame, a base plate and a platform plate. The outer frame and the inner frame are both installed on the base plate. The platform plate is installed on the top of the outer frame and the inner frame through connecting bolts. An electrically controlled telescopic gear rod is installed on the platform plate. The electrically controlled telescopic gear rod is provided with a horizontally retractable gear rod. The base plate is fixed by anchor cables and lifting rings on the prefabricated bridge deck.

[0017] Preferably, in step S5, a reinforcing bar is provided on the main reinforcement of the steel cage above the lifting lug of the steel cage, and the bottom of the reinforcing bar is connected to the reinforcing ring.

[0018] The present invention has the following characteristics and beneficial effects:

[0019] (1) The present invention has developed a prefabricated bridge deck steel pipe pile-Bailey beam drilling platform technology, which realizes the rapid construction of the drilling platform by using prefabricated concrete bridge decks. At the same time, an assembled limiter with a magnetic suction block is set at the bottom of the prefabricated bridge deck and a tensioner is used to assist in the installation, thereby effectively improving the installation accuracy of the prefabricated bridge deck.

[0020] (2) The present invention has developed a highly efficient mud differential circulation drilling technology. By arranging a winch and a pulley on the middle slurry outlet pool in conjunction with a bottom articulated gate, the mud supply can be effectively guaranteed. At the same time, when drilling is stopped, the mud circulation system can be cut off in time, and the water head in the steel casing can be freed from the control of the mud pool surface. The design is scientific and reasonable, and the use is safe and reliable.

[0021] (3) The present invention has developed a technology for installing the steel cage of a super-long pile foundation by rotary drilling. By using H-shaped stiffening plates and strengthening retaining bars, the installation strength of the lifting lugs is improved. At the same time, a steel cage auxiliary positioning and installation platform is built to achieve efficient splicing of the steel cage and improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic cross-sectional structure diagram of the drilling platform in the present invention;

[0023] Figure 2 is a schematic longitudinal-sectional structure diagram of the drilling platform in the present invention;

[0024] Figure 3 is a schematic top surface structure diagram of the precast bridge deck in the present invention;

[0025] Figure 4 is a schematic bottom surface structure diagram of the precast bridge deck in the present invention;

[0026] Figure 5 is a schematic diagram of the auxiliary installation of the tensioner for the precast bridge deck in the present invention;

[0027] Figure 6 is a schematic diagram of the differential mud reverse circulation system in the present invention;

[0028] Figure 7 is a front view of the structure of the slurry discharge tank in the present invention;

[0029] Figure 8 is a top view of the intelligent hole-forming detection device in the present invention;

[0030] Figure 9 is a sectional view of the intelligent hole-forming detection device in the present invention;

[0031] Figure 10 is a schematic diagram of the structure of the pile foundation steel cage in the present invention;

[0032] Figure 11 is a top view of the steel cage auxiliary positioning and installation platform in the present invention;

[0033] Figure 12 is a sectional view of the steel cage auxiliary positioning and installation platform in the present invention.

[0034] In the figure: 1 - precast bridge deck; 2 - embedded connecting piece; 3 - assembled limit piece; 4 - Bailey beam; 5 - Bailey beam limit piece; 6 - distribution beam; 7 - railing; 8 - top surface reserved groove; 9 - lifting ring; 10 - bottom surface reserved groove; 11 - embedded screw rod; 12 - operating rod; 13 - tensioner; 14 - tensioning rope; 15 - hook; 16 - platform pile foundation; 17 - steel casing; 18 - cast-in-place pile position; 19 - reverse circulation drill; 20 - mud groove; 21 - slurry outlet pipe; 22 - winch; 23 - towing rope; 24 - pulley; 25 - slurry outlet pond; 26 - slurry inlet pond; 27 - main support; 28 - main support top plate; 29 - auxiliary support top plate; 30 - high-strength bolt; 31 - mixing shaft; 32 - connecting cross bar; 33 - hanging rack; 34 - alignment plate; 35 - limit sleeve; 36 - ultrasonic probe; 37 - hole-forming camera; 38 - lifting lug; 39 - main reinforcement of steel reinforcement cage; 40 - stirrup; 41 - strengthening ring; 42 - H-shaped stiffening plate; 43 - outer frame; 44 - inner frame; 45 - bottom plate; 46 - platform plate; 47 - anchor cable; 48 - strengthening retaining strip; 49 - electric control telescopic tooth bar; 50 - connecting bolt; 51 - magnetic attraction block; 52 - articulated gate; 53 - auxiliary support. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0036] The construction method of ultra-long pile foundations of high-strength and high-performance concrete underwater in a marine environment specifically includes the following steps:

[0037] S1. Construction of the precast bridge deck 1 drilling platform: After measuring and lofting according to the drawings, drive the platform pile foundation 16, install the pile top distribution beam 6 on the top of the platform pile foundation 16, install the Bailey beam limit piece 5 on the upper end of the pile top distribution beam 6, then use the Bailey beam limit piece 5 to install the Bailey beam 4, and synchronously install the assembled limit piece 3 in the bottom surface reserved groove 10 of the precast bridge deck 1; Subsequently, hoist the precast bridge deck 1 and pave it. The precast bridge deck 1 is installed on the upper end of the Bailey beam 4. When paving, use the tensioner 13 to adjust the spacing between adjacent precast bridge decks 1, and finally complete the installation of the bridge deck auxiliary facilities.

[0038] Further, as Figure 3 、 Figure 4As shown in the figure, a top reserved groove 8 is provided on the top surface of the precast bridge deck 1, and a bottom reserved groove 10 is provided on the ground surface of the precast bridge deck 1. A lifting ring 9 is arranged in the top reserved groove 8, and a pre-embedded screw rod 11 is arranged in the bottom reserved groove 10. The pre-embedded screw rod 11 is connected to the assembled limit member 3, and a magnetic attraction block 51 is arranged on one side of the assembled limit member 3.

[0039] Further, as Figure 5 shown, tension ropes 14 are arranged at both ends of the tensioner 13, hooks 15 are connected to the ends of the tension ropes 14, the hooks 15 are connected to the lifting rings 9 on two adjacent precast bridge decks 1, and an operating rod 12 is arranged on the body of the tensioner 13. By operating the operating rod 12 on the tensioner 13 to tighten the tension ropes at both ends, the distance between two adjacent precast bridge decks 1 can be adjusted.

[0040] S2. Hole-forming construction with a differential-position mud reverse circulation drill 19: After driving a steel casing 17 at the designed pile position, install a reverse circulation drill 19 directly above the steel casing 17, and sequentially arrange a mud trough 20, a slurry discharge tank 25 and a slurry inlet tank 26 from near to far on one side of the reverse circulation drill 19. The end of the discharge pipe 21 of the reverse circulation drill 19 is lapped on the upper opening of the slurry inlet tank 26, the slurry discharge tank 25 is in contact with the slurry inlet tank 26, a hinged gate 52 is arranged at one end of the slurry discharge tank 25 close to the mud trough 20, the slurry inlet of the mud trough 20 is located below the hinged gate 52, and the slurry outlet of the mud trough 20 is located above the steel casing 17. When drilling, start the hoist 22 to open the hinged gate 52 and discharge slurry, forming a mud differential-position reverse circulation system for drilling.

[0041] Further, as Figure 6 、 Figure 7 shown, a main support 27 and an auxiliary support 53 are installed at the upper end of the slurry discharge tank 25 through high-strength bolts 30. A hoist 22 is arranged at the top of the main support 27. The upper end of the auxiliary support 53 is provided with an auxiliary support top plate 29. A stirring shaft 31 arranged in the vertical direction is arranged on the support top plate 29. A connecting cross bar 32 is arranged between the auxiliary support top plates 29, and a pulley 24 is arranged on the connecting cross bar 32. The towing rope 23 of the hoist 22 is wound around the pulley 24 and then connected to the hinged gate 52 at the bottom.

[0042] S3. Hole-forming detection operation for super-long pile foundations: After the reverse circulation drill 19 finishes hole-forming, install a hanging rack 33 by using the steel casing 17. The hanging rack 33 is hung on the upper end of the steel casing 17. After initially lowering an ultrasonic probe 36 and a hole-forming camera 37 into the steel casing 17, hoist and install a calibration plate 34 on the hanging rack 33. A limit sleeve 35 is arranged at the center of the calibration plate 34, and the ultrasonic probe 36 and the hole-forming camera 37 are passed through the limit sleeve 35, and then carry out a second lowering to carry out the hole-forming detection operation.

[0043] Further, as Figure 8 、 Figure 9As shown, the bracket 33 includes a central ring, and four hanging parts are arranged at equal intervals in the circumferential direction of the central ring. The upper end of the hanging part is hung on the upper end of the steel casing 17, and the bottom of the hanging part is perpendicular to the inner wall of the steel casing 17 and extends to the central ring. The alignment plate 34 is installed on the central ring of the bracket 33. A reserved installation hole for installing a limiting sleeve 35 is arranged in the center of the alignment plate 34, and the limiting sleeve 35 is inserted into the reserved installation hole.

[0044] S4. Setting up the auxiliary positioning and installation platform for the steel cage: after the hole forming test is qualified, a steel cage auxiliary positioning and installation platform is set up on the precast bridge deck 1 above the pile position, the bottom plate 45 of the steel cage auxiliary positioning and installation platform is tied and fixed to the lifting ring 9 on the precast bridge deck 1 by the anchor cable 47, the electric-controlled telescopic gear rod 49 is installed on the steel cage auxiliary positioning and installation platform, and the electric-controlled telescopic gear rod 49 on the steel cage auxiliary positioning and installation platform is connected to the power supply and debugged.

[0045] Furthermore, if Figure 11 , Figure 12 As shown, the steel cage auxiliary positioning installation platform includes an outer frame 43, an inner frame 44, a base plate 45, and a platform plate 46. The outer frame 43 and the inner frame 44 are both installed on the base plate 45. The platform plate 46 is installed on the top of the outer frame 43 and the inner frame 44 through connecting bolts 50. An electrically controlled telescopic gear rod 49 is installed on the platform plate 46. The electrically controlled telescopic gear rod 49 is provided with a horizontally retractable gear rod. The base plate 45 is fixed to the lifting ring 9 on the prefabricated bridge panel 1 through an anchor cable 47.

[0046] S5. Installation of super-long pile foundation steel cage and concrete pouring construction: four lifting ears 38 are welded at equal intervals around the main reinforcement of the upper part of the super-long pile foundation steel cage, and H-shaped stiffening plates 42 are welded inside the lifting ears 38. The steel cage is vertically lifted into the hole of the steel casing 17 through the lifting ears 38; when the upper and lower steel cages are butt-jointed, the electrically controlled telescopic toothed rod 49 is started to extend the toothed rod, and the toothed rod extends into the lifting ears 38 on the lower steel cage and temporarily fixes the lower steel cage, and the lower end of the upper steel cage is butt-jointed with the upper end of the lower steel cage. After the butt-jointing is completed, the toothed rod on the electrically controlled telescopic toothed rod 49 is retracted, and then the steel cage is continuously lowered, and finally the pile body concrete is poured using a guide tube.

[0047] Furthermore, if Figure 10 , Figure 11 As shown, a reinforcing bar 48 is provided on the main reinforcement 39 of the reinforcement cage above the lifting ear 38 of the reinforcement cage, and the bottom of the reinforcing bar 48 is connected to the reinforcing ring 41.

Claims

1. A method for constructing ultra-long pile foundations of underwater high-strength and high-performance concrete in a marine environment, characterized in that: The following steps are involved: S1. Construction of drilling platform for prefabricated bridge deck (1): after measuring and setting out according to the drawings, the platform pile foundation (16) is set up, and the pile top distribution beam (6) is installed on the top of the platform pile foundation (16), and the Bailey beam limiter (5) is installed on the upper end of the pile top distribution beam (6), and then the Bailey beam (4) is installed using the Bailey beam limiter (5), and the assembled limiter (3) is installed in the reserved groove (10) on the bottom surface of the prefabricated bridge deck (1); then the prefabricated bridge deck (1) is hoisted and paved, and the spacing between adjacent prefabricated bridge decks (1) is adjusted using the tensioner (13) during paving; S2. Hole-making construction with differential mud reverse circulation drilling rig (19): After the steel casing (17) is driven at the designed pile position, the reverse circulation drilling rig (19) is installed directly above the steel casing (17), and a mud trough (20), a mud outlet pool (25) and a mud inlet pool (26) are arranged in sequence from near to far on one side of the reverse circulation drilling rig (19). The end of the mud outlet pipe (21) of the reverse circulation drilling rig (19) is overlapped at the upper opening of the mud inlet pool (26). The slurry pool (25) is connected to the slurry inlet pool (26), and a hinged gate (52) is provided at one end of the slurry outlet pool (25) close to the slurry tank (20). The slurry inlet of the slurry tank (20) is located below the hinged gate (52), and the slurry outlet of the slurry tank (20) is located above the steel casing (17). During drilling operation, the winch (22) is turned on to open the hinged gate (52) and discharge slurry, thereby forming a slurry differential reverse circulation system. S3, ultra-long pile foundation hole forming detection operation: after the reverse circulation drilling machine (19) forms a hole, the steel casing (17) is used to install the hanging bracket (33), the hanging bracket (33) is hung on the upper end of the steel casing (17), and after the ultrasonic probe (36) and the hole forming camera (37) are initially lowered into the steel casing (17), the calibration plate (34) is hoisted on the hanging bracket (33), a limiting sleeve (35) is arranged at the center of the calibration plate (34), and the ultrasonic probe (36) and the hole forming camera (37) are passed through the limiting sleeve (35), and then lowered for a second time to carry out the hole forming detection operation; S4, setting up a steel cage auxiliary positioning and installation platform: after the hole forming test is qualified, a steel cage auxiliary positioning and installation platform is set up on the prefabricated bridge deck (1) above the pile position, the bottom plate (45) of the steel cage auxiliary positioning and installation platform is tied and fixed to the lifting ring (9) on the prefabricated bridge deck (1) through an anchor cable (47), and an electrically controlled telescopic gear rod (49) is installed on the steel cage auxiliary positioning and installation platform; S5, super-long pile foundation steel cage installation and concrete pouring construction: four lifting ears (38) are welded at equal intervals on the main reinforcement of the super-long pile foundation steel cage, and H-shaped stiffening plates (42) are welded inside the lifting ears (38). The steel cage is vertically lifted into the hole of the steel casing (17) through the lifting ears (38); when the upper and lower steel cages are butt-jointed, the electrically controlled telescopic toothed rod (49) is started to extend the toothed rod, and the toothed rod extends into the lifting ear (38) on the lower steel cage and temporarily fixes the lower steel cage, and the lower end of the upper steel cage is butt-jointed with the upper end of the lower steel cage. After the butt-jointing is completed, the toothed rod on the electrically controlled telescopic toothed rod (49) is retracted, and then the steel cage is continuously lowered, and finally the pile body concrete is poured using a guide tube.

2. The method for constructing ultra-long pile foundations of underwater high-strength and high-performance concrete in a marine environment according to claim 1, characterized in that: In step S1, a top surface reserved groove (8) is provided on the top surface of the prefabricated bridge deck (1), a bottom surface reserved groove (10) is provided on the ground surface of the prefabricated bridge deck (1), a lifting ring (9) is provided in the top surface reserved groove (8), and a pre-embedded screw (11) is provided in the bottom surface reserved groove (10), and the pre-embedded screw (11) is connected to the assembled limiting component (3).

3. The method for constructing ultra-long pile foundations of underwater high-strength and high-performance concrete in a marine environment according to claim 1, characterized in that: In step S1, tension ropes (14) are provided at both ends of the tensioner (13), the ends of the tension ropes (14) are connected to hooks (15), the hooks (15) are connected to the lifting rings (9) on two adjacent prefabricated bridge panels (1), and an operating rod (12) is provided on the tensioner (13); the tension ropes at both ends are tightened by operating the operating rod (12) on the tensioner (13), thereby adjusting the distance between the two adjacent prefabricated bridge panels (1).

4. The method for constructing ultra-long pile foundations of underwater high-strength and high-performance concrete in a marine environment according to claim 1, characterized in that: In step S2, a main support (27) and an auxiliary support (53) are installed at the upper end of the pulp discharge pool (25) by high-strength bolts (30), a winch (22) is arranged on the top of the main support (27), an auxiliary support top plate (29) is arranged at the upper end of the auxiliary support (53), a vertically arranged stirring shaft (31) is arranged on the support top plate (29), a connecting cross bar (32) is arranged between the auxiliary support top plates (29), a pulley (24) is arranged on the connecting cross bar (32), and a traction rope (23) of the winch (22) is connected to the hinged gate (52) at the bottom after passing through the pulley (24).

5. The method for constructing ultra-long pile foundations of underwater high-strength and high-performance concrete in a marine environment according to claim 1, characterized in that: In step S3, the bracket (33) includes a central ring, and four hanging parts are arranged at equal intervals in the circumferential direction of the central ring. The upper end of the hanging part is hung on the upper end of the steel casing (17), and the bottom of the hanging part is perpendicular to the inner wall of the steel casing (17) and extends to the central ring. The alignment plate (34) is installed on the central ring of the bracket (33), and a reserved installation hole for installing a limiting sleeve (35) is arranged in the center of the alignment plate (34), and the limiting sleeve (35) is inserted into the reserved installation hole.

6. The method for constructing ultra-long pile foundations of underwater high-strength and high-performance concrete in a marine environment according to claim 1, characterized in that: In step S(4), the steel cage auxiliary positioning installation platform includes an outer frame (43), an inner frame (44), a bottom plate (45), and a platform plate (46). The outer frame (43) and the inner frame (44) are both installed on the bottom plate (45). The top of the outer frame (43) and the inner frame (44) are installed with a platform plate (46) via connecting bolts (50). An electrically controlled telescopic gear rod (49) is installed on the platform plate (46). The electrically controlled telescopic gear rod (49) is provided with a horizontally retractable gear rod. The bottom plate (45) is fixed to the lifting ring (9) on the prefabricated bridge deck (1) via an anchor cable (47).

7. The method for constructing ultra-long underwater high-strength and high-performance concrete pile foundation in a marine environment according to claim 1, characterized in that: In step S5, a reinforcing bar (48) is provided on the main reinforcement (39) of the reinforcement cage above the lifting lug (38) of the reinforcement cage, and the bottom of the reinforcing bar (48) is connected to the reinforcing ring (41).

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