CN118345803A - Integral installation construction process for ultra-long prefabricated square pile - Google Patents

Abstract

The invention discloses an overall installation construction process of an ultra-long prefabricated square pile, which belongs to the technical field of building construction and comprises the following steps of: s1000, installing a pile-down platform; s2000, hoisting square piles; s3000, square pile turning; s4000, pile feeding of square piles; s5000, constructing the next pile position. The method is applicable to the installation and construction of the ultra-long prefabricated square pile, solves the problem of hoisting safety of the ultra-long prefabricated square pile, reduces the installation time of the prefabricated square pile, improves the installation precision of the prefabricated square pile, and provides powerful guarantee for the installation of the quality and quantity of the project prefabricated square pile.

Description

Integral installation construction process for ultra-long prefabricated square pile

Technical Field

The invention belongs to the technical field of building construction, and particularly relates to an overall installation construction process of an ultra-long prefabricated square pile.

Background

In order to promote the development of the assembled building and promote the upgrading transformation of the building industry, the subway station sequentially pushes out the engineering of the assembled underground station. The construction of the Jinan subway No. 8 line takes prefabricated superposition assembly as an idea, and temporary support systems such as underground station guard piles, temporary upright piles, internal supports and the like are permanently combined with station structures, so that pile-wall superposition, prefabricated middle column superposition, support-prefabricated slab superposition and other construction characteristics are formed. The pile-wall superposition adopts the prefabricated square piles of the building envelope to be superposed with the side walls of the station, so that the utilization rate of the building envelope is improved, the thickness of the side walls can be reduced, and the construction cost is reduced.

In the prior art, the prefabricated square pile serving as the pile-wall superposition of the underground station participates in the stress of the main structure, the pile body is provided with a plurality of pre-buried connectors, the construction precision requirement is high, so that the pile-wall superposition effect is ensured, the pile length of the prefabricated square pile serving as the enclosure structure can reach 20-30 m, and the integral hoisting and the installation precision control of the ultra-long prefabricated square pile are two problems in construction.

Disclosure of Invention

In order to solve the problems, the invention adopts the following technical scheme:

an overall installation construction process of an ultra-long prefabricated square pile comprises the following steps:

s1000, installing a pile-down platform;

s2000, hoisting square piles;

s3000, square pile turning;

S4000, pile feeding of square piles;

s5000, constructing the next pile position.

Further, lower stake platform includes upper plat form and lower platform, the upper plat form is fixed in on the lower platform, upper plat form edge is equipped with the rail guard, upper plat form with the middle part of lower platform is run through respectively and is equipped with first hole, second and places the hole, upper plat form is last and be located first hole department of placing is equipped with the guide holder, lower platform middle part just is located second place hole department is equipped with the centre gripping slips, one side of centre gripping slips is equipped with the centre gripping hydro-cylinder, lower platform one side is equipped with the landing leg, the landing leg is through the guide pulley group of being connected with it with be located the sliding rail connection of lower platform lower part, lower platform both sides are fixed with the rail clamp, one side of lower platform is equipped with power unit, hydraulic tank and operation panel.

Further, the square pile hoisting device comprises a prefabricated square pile and a sling component connected with the prefabricated square pile, wherein a first main hoisting hole, a second main hoisting hole and an auxiliary hoisting hole are formed in the square pile, and the auxiliary hoisting hole is located on the same side of the first main hoisting hole and the second main hoisting hole; the sling component comprises a first steel plate cross hanging beam and a second steel plate cross hanging beam which are positioned at the upper part of the square pile, lifting holes are symmetrically formed in the upper parts of the first steel plate cross hanging beam and the second steel plate cross hanging beam, connecting holes are symmetrically formed in the lower parts of the first steel plate cross hanging beam and the second steel plate cross hanging beam, U-shaped ring shackles are respectively fixed on the connecting holes and the lifting holes, and a roller skate is arranged at the lower part of the U-shaped ring shackles positioned on the first steel plate cross hanging beam; the steel bar lifting device comprises a first main lifting hole, a second main lifting hole and an auxiliary lifting hole, wherein steel bars are arranged in the first main lifting hole, the second main lifting hole and the auxiliary lifting hole, rotating assemblies are connected to two sides of each steel bar in a rotating mode, and the rotating assemblies are connected with a D-shaped shackle.

Further, the D-shaped shackles on the same side of the first main hanging hole and the second main hanging hole are connected through the same first steel wire rope, the first steel wire rope penetrates through the roller skate, and a second steel wire rope connected with the D-shaped shackles is arranged on the side opposite to the first steel wire rope; the D-shaped shackle at the auxiliary hanging hole is connected with the U-shaped ring shackle at the lower part of the second steel plate transverse hanging beam through a third steel wire rope; the U-shaped ring shackles at the two sides of the same lifting hole at the upper parts of the first steel plate transverse lifting beam and the second steel plate transverse lifting beam are respectively connected through a fourth steel wire rope and a fifth steel wire rope, and the fourth steel wire rope and the fifth steel wire rope are respectively hung on a main crane hook and an auxiliary crane hook.

Further, in step S2000, square pile lifting includes the steps of:

S2100, positioning the crawler crane, connecting the sling assembly with the prefabricated square pile and finishing inspection;

S2200, under the command of a span signal worker, the main crane and the auxiliary crane slowly hoist at the same time, the prefabricated square pile is horizontally hoisted to be 0.3m away from the ground, and suspended for 1-2 minutes, so that the deformation and stability of the prefabricated square pile are inspected and observed;

s2300, checking whether the connection of the hanging point sling assembly is good or not again, and after checking that the connection is good, commanding the main crane and the auxiliary crane to slowly lift and hoist the prefabricated square pile by the span wire signal worker until the prefabricated square pile is lifted off the ground by 2m.

Further, in step S3000, the square pile aerial rotator includes the following steps:

S3100, the auxiliary crane does not need to lift the derrick mast too much, and only needs to control the tail of the prefabricated square pile at a distance of 1-2 m from the ground;

S3200, lifting the auxiliary crane along with the prefabricated square pile while rotating the prefabricated square pile, and slowly moving the auxiliary crane to the main crane, wherein the distance between the large arm and the sling assembly at the main sling hole is more than 2 m;

S3300, slowly lifting the derrick mast by the main crane until the prefabricated square pile is converted from a horizontal state to a vertical state, and then lightly placing the bottom end of the prefabricated square pile on the ground, and straightening a main crane steel wire rope to bear the weight of the prefabricated square pile;

S3400, loosening and sagging an auxiliary crane, removing a sling component at an auxiliary sling hole on a prefabricated square pile, enabling the auxiliary crane to be far away from a hoisting area, and hanging the sling component at the auxiliary sling hole by using a main crane auxiliary hook when the sling component at the auxiliary sling hole cannot be removed due to overhigh auxiliary sling hole, wherein the sling component at the auxiliary sling hole is removed in the pile discharging process.

Further, in step S4000, the square pile driving includes the steps of:

S4100, after the prefabricated square pile is turned to a vertical state, inserting a pile-down platform which is already in place, and carrying out pile delivery through the auxiliary hanging point, the second main hanging point and the first main hanging point in sequence;

S4200, carrying out integral pile delivery after the pile delivery device is connected with the prefabricated square pile until the pile top of the prefabricated square pile reaches the corresponding elevation;

S4300, after the installation precision of the prefabricated square pile meets the requirement, starting a pile-down platform clamping slip to fix the pile driver;

S4400, after cement soil around the pile is solidified, the platform and the pile driver are removed, the clamping force of the clamping slips is removed, the pile driver calipers are retracted and lifted out, and then the platform can be moved to the next pile position for installation construction.

Further, in the step S4100, the concrete pile feeding includes the steps of:

s4110, when the prefabricated square pile is lowered to the auxiliary hanging hole, removing a sling assembly at the auxiliary hanging hole and continuing pile feeding;

S4120, when the steel bar assembly is lowered into the second main hanging hole, the steel bar assembly is placed in the U-shaped groove of the platform opening guide seat, the prefabricated square pile is clamped and fixed by using the clamping slips, the steel bar at the second main hanging hole is removed, and the first steel wire rope and the second steel wire rope are connected to form a closed loop;

S4130, after connection, the main crane slowly lifts to tighten the first steel wire rope and the second steel wire rope, at the moment, the crane is enabled to take force and then the platform clamping slips are detached, the impact force on the platform is prevented from being overlarge in the moment of unloading force, and the taking force is slightly smaller than the pile dead weight minus the buoyancy force received in the cement soil;

s4140, lifting the prefabricated square pile by 20-50 cm by the main lifting hook after stabilization, and extracting the steel bar at the second main lifting hole to continue pile delivery;

S4150, when the steel bar is lowered to the first main hanging hole, removing the steel bar at the first main hanging hole in a mode of S4110;

s4160, when the pile top of the prefabricated pile-preventing is positioned at 1.3-3.8 m below the horizontal ground, conveying the square pile to a designed elevation by additionally arranging a pile top pile driver, and controlling the pile driver at an orifice through a pile-discharging platform to accurately control the plane position, elevation and verticality of the prefabricated square pile;

S4170, when the prefabricated square pile is lowered to the first main hanging hole of the pile top, starting the pile delivery platform to clamp and fix the prefabricated square pile, slowly enabling the main hanging hook to loosen after the prefabricated square pile is stabilized, and hanging the pile delivery device to the pile top by using the 150t crawler crane to be connected with the prefabricated square pile.

Further, in the step S4200, the pile driver after the pile driver is connected to the prefabricated square pile includes the following steps:

s4210, measuring elevation, plane position and verticality of the prefabricated square pile on a pile-down platform through a pile driver;

S4220, elevation can be adjusted through lifting hooks and falling hooks, and plane positions and perpendicularity deviation of the plane positions can be finely adjusted through hydraulic clamping slips in four directions of the platform until requirements are met.

The invention has the beneficial effects that:

(1) The deep design program of the square pile lifting point has the characteristics of parametrization and generalization, adopts a double-machine three-point lifting principle, and determines the position of the square pile lifting point through researching the deflection checking calculation of the square pile and the design of a sling.

(2) The square pile lifting installation state conversion technology has the characteristics of generalization, rapidness and safety, and researches on three states of three-point lifting, aerial turning and pile feeding of the square pile are summarized.

(3) The control technology of the square pile 'lower pile platform and the pile feeder' has the characteristics of generalization, quick replacement and accuracy, and the lower pile accuracy of the square pile is controlled through the positioning and leveling of the lower pile platform, the clamping function of the square pile and the hydraulic calipers of the pile feeder, so that the installation quality of the prefabricated square pile is ensured.

Drawings

FIG. 1 is a construction process flow diagram;

fig. 2 is a schematic view of a pile follower platform.

FIG. 3 is a schematic view of a precast square pile structure;

FIG. 4 is a main hanging hole connection schematic;

FIG. 5 is a schematic view of a secondary hanging hole connection;

FIG. 6 is a front view of a steel rod connection;

FIG. 7 is a steel bar connection side view;

FIG. 8 is a square pile lifting schematic;

FIG. 9 is a schematic view of a square pile swivel;

FIG. 10 is a schematic view of a square pile swivel to a vertical position;

1, a protective fence; 2. a guide seat; 3. a top platform; 4. clamping slips; 5. a support leg; 6. a guide wheel group; 7. clamping an oil cylinder; 8. a rail clamp; 9. a power unit; 10. a hydraulic oil tank; 11. an operation table; 12. a lower platform; 13. a first placement hole; 14. a second placement hole; 15. a first main hanging hole; 16. a second main hanging hole; 17. a secondary hanging hole; 18. a first steel plate cross hanging beam; 19. a second steel plate cross hanging beam; 20. lifting holes; 21. a connection hole; 22. a fifth wire rope; 23. a roller skate; 24. a steel bar; 25. a rotating assembly; 26. d-type shackle; 27. a first wire rope; 28. a second wire rope; 29. a third wire rope; 30. and a fourth wire rope.

Detailed Description

The invention provides an overall installation construction process of an ultra-long prefabricated square pile. The following detailed description of the present invention is provided in connection with the accompanying drawings, so as to facilitate understanding and grasping thereof.

Example 1

Referring to fig. 1-10, an overall installation construction process of an ultra-long prefabricated square pile comprises the following steps:

s1000, installing a pile-down platform;

The lower pile platform comprises an upper platform 3 and a lower platform 12, wherein the upper platform 3 is fixed on the lower platform 12, a protective fence 1 is arranged at the edge of the upper platform 3, a first placing hole 13 and a second placing hole 14 are respectively formed in the middle of the upper platform 3 and the lower platform 12 in a penetrating manner, a guide seat 2 is arranged on the upper platform 3 and is positioned at the first placing hole 13, a clamping slip 4 is arranged at the middle of the lower platform 12 and is positioned at the second placing hole 14, a clamping cylinder 7 is arranged on one side of the clamping slip 4, a supporting leg 5 is arranged on one side of the lower platform 12, the supporting leg 5 is connected with a sliding rail positioned at the lower part of the lower platform 12 through a guide wheel group 6 connected with the supporting leg, rail clamping devices 8 are fixed on two sides of the lower platform 12, and a power unit 9, a hydraulic oil tank 10 and an operating platform 11 are arranged on one side of the lower platform 12; the prefabricated square pile passes through the first placing hole 13 and the second placing hole 14, the guide seat 2 has a guiding function on the prefabricated square pile, and the clamping cylinder 7 and the clamping slips 4 can clamp the prefabricated square pile.

S2000, hoisting square piles;

The square pile hoisting device comprises a prefabricated square pile and a sling component connected with the prefabricated square pile, wherein a first main hoisting hole 15, a second main hoisting hole 16 and a secondary hoisting hole 17 are arranged on the square pile, and the secondary hoisting hole 17 is positioned on the same side of the first main hoisting hole 15 and the second main hoisting hole 16; the sling component comprises a first steel plate transverse hanging beam 18 and a second steel plate transverse hanging beam 19 which are positioned at the upper part of the square pile, lifting holes 20 are symmetrically formed at the upper parts of the first steel plate transverse hanging beam 18 and the second steel plate transverse hanging beam 19, connecting holes 21 are symmetrically formed at the lower parts of the first steel plate transverse hanging beam 18 and the second steel plate transverse hanging beam 19, U-shaped ring shackles are respectively fixed on the connecting holes 21 and the lifting holes 20, and a roller skate 23 is arranged at the lower part of a U-shaped ring shackle 22 positioned on the first steel plate transverse hanging beam 18; the first main hanging hole 15, the second main hanging hole 16 and the auxiliary hanging hole 17 are respectively provided with a steel rod 24, two sides of the steel rod 24 are rotatably connected with rotating assemblies 25, and the rotating assemblies 25 are connected with a D-shaped shackle 26.

The D-shaped shackle 26 on the same side of the first main hanging hole 15 and the second main hanging hole 16 are connected through the same first steel wire rope 27, the first steel wire rope 27 penetrates through the roller 23, and a second steel wire rope 28 connected with the D-shaped shackle 26 is arranged on the side opposite to the first steel wire rope 27; the D-shaped shackle 26 at the auxiliary hanging hole 17 is connected with a U-shaped ring shackle at the lower part of the second steel plate transverse hanging beam 19 through a third steel wire rope 29; the U-shaped ring shackles at the two sides of the same lifting hole 20 at the upper parts of the first steel plate transverse hanging beam 18 and the second steel plate transverse hanging beam 19 are respectively connected through a fourth steel wire rope 30 and a fifth steel wire rope 22, and the fourth steel wire rope 30 and the fifth steel wire rope 22 are respectively hung on a main crane hook and a secondary crane hook.

Preferably, the length of the prefabricated square pile is 19-23 m, the section size is 700mm multiplied by 700mm, the member is slender, the lifting point is selected to comprehensively examine the deflection of the square pile and solve the problem of lifting point disassembly in the pile conveying process, the self structure is not damaged when the prefabricated square pile is lifted, and the construction is convenient. The prefabricated square pile is integrally hoisted in a double-machine three-point hoisting mode, so that reasonable stress of a prefabricated pile body can be guaranteed, the prefabricated square pile is convenient to rotate to a vertical state from a flat position, opposite perforation holes are reserved at pile body hoisting point positions through phi 75PVC pipes, and then auxiliary hoisting holes 17, second main hoisting holes 16 and first main hoisting holes 15 are formed.

Preferably, the diameters of steel bars at the first main hanging hole 15 and the second main hanging hole 16 are 68mm, the U-shaped ring shackle connected with the connecting hole 21 on the first steel plate transverse hanging beam 18 is 20 tons, the length of the first steel wire rope 27 passing through the 20t pulley 23 is 16m, and the diameter is 36mm; the length of a fourth steel wire rope 30 adopted at the upper part of the first steel plate transverse hanging beam 18 is 2m, the diameter of the fourth steel wire rope is 48mm, and the U-shaped ring shackle connected with the lifting hole 20 on the first steel plate transverse hanging beam 18 is 25 tons; the second wire rope 28 is 9m long and 36mm in diameter for rope replacement connection during pile driving.

Preferably, the diameter of the steel rod at the auxiliary hanging hole 17 is 68mm, the U-shaped ring shackle on the second steel plate transverse hanging beam 19 connected with the connecting hole 21 and the lifting hole 20 is 20 tons, the length of the third steel wire rope 29 is 3m, the diameter is 48mm, and the length of the fifth steel wire rope 22 is 2m, and the diameter is 48mm.

Preferably, the rotating assembly 25 can rotate around the middle steel bar 24, and the clear distance between the middle part of the rotating assembly 25 is 720mm, so that the rotating body is convenient for hoisting the prefabricated square pile; one end of the rotating component 25 is connected with the steel bar 24 in a way of matching a nut with an elastic pin; the upper part of the rotating component 25 is respectively connected with a 25tD shackle 26, which is convenient for hoisting.

Preferably, the first steel plate transverse hanging beam 18 and the second steel plate transverse hanging beam 19 are made of No. 45 steel, and have the thickness of 5cm, the length of 1.5m and the height of 60cm; the diameters of the connecting hole 21 and the lifting hole 20 are 8cm, the center of the holes is 16cm away from the edge of the steel plate, the distance between the two holes at the bottom is 900mm, and the distance between the two holes at the top is 700mm.

S2100, positioning the crawler crane, connecting the sling assembly with the prefabricated square pile and finishing inspection;

S2200, under the command of a span signal worker, the main crane and the auxiliary crane slowly hoist at the same time, the prefabricated square pile is horizontally hoisted to be 0.3m away from the ground, and suspended for 1-2 minutes, so that the deformation and stability of the prefabricated square pile are inspected and observed;

s2300, checking whether the connection of the sling components of the hanging points is perfect or not again, and after checking that the connection is perfect, commanding the main crane and the auxiliary crane to slowly lift and hoist the prefabricated square pile by a span signal worker until the prefabricated square pile is lifted off the ground by 2m;

s3000, square pile turning;

S3100, the auxiliary crane does not need to lift the derrick mast too much, and only needs to control the tail of the prefabricated square pile at a distance of 1-2 m from the ground;

S3200, lifting the auxiliary crane along with the prefabricated square pile while rotating the prefabricated square pile, and slowly moving the auxiliary crane to the main crane, wherein the distance between the large arm and the sling assembly at the main sling hole is more than 2 m;

S3300, slowly lifting the derrick mast by the main crane until the prefabricated square pile is converted from a horizontal state to a vertical state, and then lightly placing the bottom end of the prefabricated square pile on the ground, and straightening a main crane steel wire rope to bear the weight of the prefabricated square pile;

S3400, loosening and sagging an auxiliary crane, removing a sling component at an auxiliary sling hole on a prefabricated square pile, wherein the auxiliary crane can be far away from a hoisting area, and when the sling component at the auxiliary sling hole cannot be removed due to overhigh auxiliary sling hole, hanging the sling component at the auxiliary sling hole by using a main crane auxiliary hook, and removing the sling component in the pile discharging process;

S4000, pile feeding of square piles;

S4100, after the prefabricated square pile is turned to a vertical state, inserting a pile-down platform which is already in place, and carrying out pile delivery through the auxiliary hanging point, the second main hanging point and the first main hanging point in sequence;

S4110, when the prefabricated square pile is lowered to the auxiliary hanging hole, removing a sling component at the hole hanging hole and continuing pile feeding;

S4120, when the steel bar assembly is lowered into the second main hanging hole, the steel bar assembly is placed in the U-shaped groove of the platform opening guide seat, the prefabricated square pile is clamped and fixed by using the clamping slips, the steel bar at the second main hanging hole is removed, and the first steel wire rope and the second steel wire rope are connected to form a closed loop;

S4130, after connection, the main crane slowly lifts to tighten the first steel wire rope and the second steel wire rope, at the moment, the crane is enabled to take force and then the platform clamping slips are detached, the impact force on the platform is prevented from being overlarge in the moment of unloading force, and the taking force is slightly smaller than the pile dead weight minus the buoyancy force received in the cement soil;

s4140, lifting the prefabricated square pile by 20-50 cm by the main lifting hook after stabilization, and extracting the steel bar at the second main lifting hole to continue pile delivery;

S4150, when the steel bar is lowered to the first main hanging hole, removing the steel bar at the first main hanging hole in a mode of S4110;

s4160, when the pile top of the prefabricated pile-preventing is positioned at 1.3-3.8 m below the horizontal ground, conveying the square pile to a designed elevation by additionally arranging a pile top pile driver, and controlling the pile driver at an orifice through a pile-discharging platform to accurately control the plane position, elevation and verticality of the prefabricated square pile;

S4170, when the prefabricated square pile is lowered to the first main hanging hole of the pile top, starting the pile delivery platform to clamp and slip, clamping and fixing the prefabricated square pile, slowly loosening the main hanging hook after stabilizing, and hanging the pile delivery device to the pile top by using a 150t crawler crane to connect the pile top with the prefabricated square pile;

S4200, carrying out integral pile delivery after the pile delivery device is connected with the prefabricated square pile until the pile top of the prefabricated square pile reaches the corresponding elevation;

s4210, measuring elevation, plane position and verticality of the prefabricated square pile on a pile-down platform through a pile driver;

S4220, the elevation can be adjusted through lifting hooks and falling hooks, and the plane position and the perpendicularity deviation of the plane position can be finely adjusted through hydraulic clamping slips in four directions of the platform until the requirements are met;

S4300, after the installation precision of the prefabricated square pile meets the requirement, starting a pile-down platform clamping slip to fix the pile driver;

S4400, after cement soil around the pile is solidified, dismantling the platform and the pile driver, firstly removing the clamping force of the clamping slips, withdrawing the pile driver calipers, and then hoisting out, so that the platform can be moved to the next pile position for installation construction;

s5000, constructing the next pile position.

While the foregoing has been described in terms of embodiments of the present invention, it will be appreciated that the embodiments of the invention are not limited by the foregoing description, but rather, all embodiments of the invention may be modified in structure, method or function by one skilled in the art to incorporate the teachings of this invention, as expressed in terms of equivalent or equivalent embodiments, without departing from the scope of the invention.

Claims (9)

1. The integral installation construction process of the ultra-long prefabricated square pile is characterized by comprising the following steps of:

s1000, installing a pile-down platform;

s2000, hoisting square piles;

s3000, square pile turning;

S4000, pile feeding of square piles;

s5000, constructing the next pile position.

2. The overlength prefabricated square pile integral installation construction process according to claim 1, wherein the lower pile platform comprises an upper platform and a lower platform, the upper platform is fixed on the lower platform, a guard rail is arranged at the edge of the upper platform, a first placing hole and a second placing hole are respectively formed in the middle of the upper platform and the middle of the lower platform in a penetrating mode, a guide seat is arranged on the upper platform and located at the first placing hole, a clamping slip is arranged at the middle of the lower platform and located at the second placing hole, a clamping oil cylinder is arranged on one side of the clamping slip, a supporting leg is arranged on one side of the lower platform, the supporting leg is connected with a sliding rail arranged on the lower portion of the lower platform through a guide wheel set connected with the supporting leg, a rail clamping device is fixed on two sides of the lower platform, and a power unit, a hydraulic oil tank and an operating platform are arranged on one side of the lower platform.

3. The construction process for integrally installing an ultra-long prefabricated square pile according to claim 1, wherein the square pile hoisting device comprises a prefabricated square pile and a sling component connected with the prefabricated square pile, a first main hanging hole, a second main hanging hole and a secondary hanging hole are formed in the square pile, and the secondary hanging hole is located on the same side of the first main hanging hole and the second main hanging hole; the sling component comprises a first steel plate cross hanging beam and a second steel plate cross hanging beam which are positioned at the upper part of the square pile, lifting holes are symmetrically formed in the upper parts of the first steel plate cross hanging beam and the second steel plate cross hanging beam, connecting holes are symmetrically formed in the lower parts of the first steel plate cross hanging beam and the second steel plate cross hanging beam, U-shaped ring shackles are respectively fixed on the connecting holes and the lifting holes, and a roller skate is arranged at the lower part of the U-shaped ring shackles positioned on the first steel plate cross hanging beam; the steel bar lifting device comprises a first main lifting hole, a second main lifting hole and an auxiliary lifting hole, wherein steel bars are arranged in the first main lifting hole, the second main lifting hole and the auxiliary lifting hole, rotating assemblies are connected to two sides of each steel bar in a rotating mode, and the rotating assemblies are connected with a D-shaped shackle.

4. The construction process for integrally installing an ultra-long prefabricated square pile according to claim 3, wherein the D-shaped shackles on the same side of the first main hanging hole and the second main hanging hole are connected through the same first steel wire rope, the first steel wire rope penetrates through the roller skate, and a second steel wire rope connected with the D-shaped shackles is arranged on the side opposite to the first steel wire rope; the D-shaped shackle at the auxiliary hanging hole is connected with the U-shaped ring shackle at the lower part of the second steel plate transverse hanging beam through a third steel wire rope; the U-shaped ring shackles at the two sides of the same lifting hole at the upper parts of the first steel plate transverse lifting beam and the second steel plate transverse lifting beam are respectively connected through a fourth steel wire rope and a fifth steel wire rope, and the fourth steel wire rope and the fifth steel wire rope are respectively hung on a main crane hook and an auxiliary crane hook.

5. The construction process for integrally installing an ultra-long prefabricated square pile according to claim 4, wherein in step S2000, square pile lifting comprises the steps of:

S2100, positioning the crawler crane, connecting the sling assembly with the prefabricated square pile and finishing inspection;

S2200, under the command of a span signal worker, the main crane and the auxiliary crane slowly hoist at the same time, the prefabricated square pile is horizontally hoisted to be 0.3m away from the ground, and suspended for 1-2 minutes, so that the deformation and stability of the prefabricated square pile are inspected and observed;

s2300, checking whether the connection of the hanging point sling assembly is good or not again, and after checking that the connection is good, commanding the main crane and the auxiliary crane to slowly lift and hoist the prefabricated square pile by the span wire signal worker until the prefabricated square pile is lifted off the ground by 2m.

6. The construction process for integrally installing an ultralong prefabricated square pile according to claim 4, wherein in step S3000, the square pile aerial rotator comprises the steps of:

S3100, the auxiliary crane does not need to lift the derrick mast too much, and only needs to control the tail of the prefabricated square pile at a distance of 1-2 m from the ground;

S3200, lifting the auxiliary crane along with the prefabricated square pile while rotating the prefabricated square pile, and slowly moving the auxiliary crane to the main crane, wherein the distance between the large arm and the sling assembly at the main sling hole is more than 2 m;

S3300, slowly lifting the derrick mast by the main crane until the prefabricated square pile is converted from a horizontal state to a vertical state, and then lightly placing the bottom end of the prefabricated square pile on the ground, and straightening a main crane steel wire rope to bear the weight of the prefabricated square pile;

S3400, loosening and sagging an auxiliary crane, removing a sling component at an auxiliary sling hole on a prefabricated square pile, enabling the auxiliary crane to be far away from a hoisting area, and hanging the sling component at the auxiliary sling hole by using a main crane auxiliary hook when the sling component at the auxiliary sling hole cannot be removed due to overhigh auxiliary sling hole, wherein the sling component at the auxiliary sling hole is removed in the pile discharging process.

7. The construction process for integrally installing an ultralong prefabricated square pile according to claim 4, wherein in step S4000, the square pile driving comprises the steps of:

S4100, after the prefabricated square pile is turned to a vertical state, inserting a pile-down platform which is already in place, and carrying out pile delivery through the auxiliary hanging point, the second main hanging point and the first main hanging point in sequence;

S4200, carrying out integral pile delivery after the pile delivery device is connected with the prefabricated square pile until the pile top of the prefabricated square pile reaches the corresponding elevation;

S4300, after the installation precision of the prefabricated square pile meets the requirement, starting a pile-down platform clamping slip to fix the pile driver;

S4400, after cement soil around the pile is solidified, the platform and the pile driver are removed, the clamping force of the clamping slips is removed, the pile driver calipers are retracted and lifted out, and then the platform can be moved to the next pile position for installation construction.

8. The process for integrally installing and constructing an ultra-long prefabricated square pile according to claim 7, wherein in the step S4100, concrete pile feeding comprises the steps of:

s4110, when the prefabricated square pile is lowered to the auxiliary hanging hole, removing a sling assembly at the auxiliary hanging hole and continuing pile feeding;

S4120, when the steel bar assembly is lowered into the second main hanging hole, the steel bar assembly is placed in the U-shaped groove of the platform opening guide seat, the prefabricated square pile is clamped and fixed by using the clamping slips, the steel bar at the second main hanging hole is removed, and the first steel wire rope and the second steel wire rope are connected to form a closed loop;

S4130, after connection, the main crane slowly lifts to tighten the first steel wire rope and the second steel wire rope, at the moment, the crane is enabled to take force and then the platform clamping slips are detached, the impact force on the platform is prevented from being overlarge in the moment of unloading force, and the taking force is slightly smaller than the pile dead weight minus the buoyancy force received in the cement soil;

s4140, lifting the prefabricated square pile by 20-50 cm by the main lifting hook after stabilization, and extracting the steel bar at the second main lifting hole to continue pile delivery;

S4150, when the steel bar is lowered to the first main hanging hole, removing the steel bar at the first main hanging hole in a mode of S4110;

s4160, when the pile top of the prefabricated pile-preventing is positioned at 1.3-3.8 m below the horizontal ground, conveying the square pile to a designed elevation by additionally arranging a pile top pile driver, and controlling the pile driver at an orifice through a pile-discharging platform to accurately control the plane position, elevation and verticality of the prefabricated square pile;

S4170, when the prefabricated square pile is lowered to the first main hanging hole of the pile top, starting the pile delivery platform to clamp and fix the prefabricated square pile, slowly enabling the main hanging hook to loosen after the prefabricated square pile is stabilized, and hanging the pile delivery device to the pile top by using the 150t crawler crane to be connected with the prefabricated square pile.

9. The process for integrally installing and constructing an ultralong prefabricated square pile according to claim 7, wherein in the step S4200, the pile after the pile driver is connected to the prefabricated square pile comprises the steps of:

s4210, measuring elevation, plane position and verticality of the prefabricated square pile on a pile-down platform through a pile driver;

S4220, elevation can be adjusted through lifting hooks and falling hooks, and plane positions and perpendicularity deviation of the plane positions can be finely adjusted through hydraulic clamping slips in four directions of the platform until requirements are met.