Construction hoisting method and construction hoisting device for large-diameter super-long pile foundation reinforcement cage

Abstract

The invention provides a construction hoisting method and construction hoisting equipment for a large-diameter super-long pile foundation reinforcement cage, which comprises the following steps: firstly, mounting a corresponding bracket according to the prefabricated size of the reinforcement cage, then presetting a hoisting point on one side of the bracket, taking the other side of the bracket as a tail point, and configuring a rotating assembly at the position of the tail point. Meanwhile, a lifting device is arranged at the bottom of the lower half support and used for assisting the hoisting process. Welding the outer stirrups and the positioning stirrups of the first section of reinforcement cage and positioning and welding the subsequent sections of reinforcement cages at the hoisting point position of the upper half bracket to form a standard section of reinforcement cage with a prefabricated size, and installing a monitoring assembly for monitoring the hoisting process in real time. And hoisting equipment is used for hoisting the reinforcement cage through the hoisting points, and the reinforcement cage is gradually rotated from the horizontal state to the vertical state with the rotating assembly as a fulcrum. And finally, the reinforcement cage in the vertical state is hoisted to a pile foundation hole opening to be lowered and installed. And the safety, the stability and the construction efficiency of hoisting the large-diameter super-long reinforcement cage are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel cage construction, and more specifically, relates to a construction hoisting method and a construction hoisting device for a large-diameter and ultra-long pile foundation steel cage. Background Art

[0002] In pile foundation construction, the construction process for rotary bored piles typically includes steps such as construction preparation, setting out and positioning, embedding casing, drilling, fabricating and installing the rebar cage, installing embedded parts, lowering the guide pipe, pouring concrete to the pile top, and concrete curing. The fabrication and installation of the rebar cage is one of the most complex and critical steps in the entire construction process, and its quality directly determines the performance and safety of the pile. Currently, the rebar cage is typically fabricated in a ground-based processing shed or factory, and then installed into the pile hole through a complete hoisting method. However, for extremely long and large rebar cages, such as those with a diameter of 2.5 meters and a length of up to 40 meters, this traditional hoisting method presents numerous challenges. Due to the significant increase in length and weight, the hoisting process not only needs to overcome the impact of weight and size, but also requires special attention to prevent deformation of the rebar cage during the hoisting process. However, China currently lacks mature industry experience and technical equipment for the direct hoisting construction of extremely long and large rebar cages, and the equipment and lifting tools used for hoisting require redesign and research.

[0003] In actual construction, pile foundation reinforcement cages are typically processed in sections for ease of hoisting and installation. After each section is fabricated, it is hoisted sequentially to the pile foundation opening and installed. During this process, the longitudinal main reinforcement of the cage segments must be spliced, typically using steel sleeves or welding. However, due to the reinforcement provided by reinforcing stirrups and spiral stirrups, splicing the longitudinal main reinforcement at the construction site is challenging, time-consuming, and difficult to control for quality. Furthermore, workers must perform this splicing at the pile foundation opening, which is not only inefficient but also poses significant safety risks. The reinforcement cage is typically heavy, weighing tens or even hundreds of tons. During the hoisting process, the cage must be flipped from a horizontal to a vertical position, requiring a change in the lifting point location and force direction. Due to the cage's heavy weight, the lifting points must maintain a high load-bearing capacity. Insufficient structural strength at the lifting points or improper handling during hoisting can lead to deformation or even damage to the cage.

[0004] Therefore, there are many deficiencies in the existing technology in the hoisting construction of super-long and super-large steel cages. Those skilled in the art urgently need to invent a new hoisting method and equipment that can effectively solve the above problems, so as to improve construction efficiency, ensure construction quality and safety, and reduce construction costs. Summary of the Invention

[0005] In response to the above-mentioned deficiencies or improvement needs of the prior art, the present invention provides a construction and hoisting method specifically for large-diameter, ultra-long pile foundation steel cages. By providing brackets, hoisting points, rotating components, and lifting devices, the method achieves a smooth transition of the steel cage from a horizontal to a vertical state, thereby avoiding deformation or damage to the steel cage due to its own weight and length during the hoisting process. Specifically, in a first aspect, the present invention provides a construction and hoisting method for large-diameter, ultra-long pile foundation steel cages, the method comprising:

[0006] S1. Install a bracket of corresponding size according to the pre-prepared size of the steel cage; the bracket includes an upper bracket and a lower bracket, the upper bracket is used to place the steel cage for hoisting, the lower bracket is connected to the upper bracket as an integral structure, and is used to support the upper bracket;

[0007] S2. A preset lifting point on one side of the bracket, and a side away from the lifting point as the tail point;

[0008] S3. Set the rotation point according to the tail point, and configure the rotating assembly;

[0009] S4. A lifting point is set at the bottom of the lower bracket, and a lifting device is configured;

[0010] S5. Welding the outer stirrups and positioning stirrups of the first section of the steel cage at the hoisting point of the upper half of the bracket;

[0011] S6. Positioning and welding the first section of the steel cage according to the first section N, where N is a positive integer, until the standard section of the pre-prepared size steel cage is completed;

[0012] S7. Set up several monitoring points on the standard section steel cage and set up monitoring components;

[0013] S8. Use the lifting equipment to lift the steel cage of the standard section through the lifting point, and at the same time, use the rotation point as the basis for rotation, so that the steel cage of the standard section gradually rotates from a horizontal position to a vertical position;

[0014] S9. Hoist the standard section steel cage in a vertical state to the opening of the pile foundation for lowering and installation.

[0015] In the first aspect, the S8 also includes: while starting the lifting device, using the lifting equipment to slowly tighten the wire rope connected to the lifting point of the steel cage as the lifting device rises, gradually making the wire rope subject to force, and after lifting to a certain angle, the steel cage will not bend and deform due to its own weight and the angle of the wire rope, and the steel cage will be slowly lifted up, and finally the steel cage will be perpendicular to the ground.

[0016] In the first aspect, the S7 also includes: installing multiple sensors on the steel cage, including an angle sensor, a tension sensor and a displacement sensor, wherein the angle sensor is used to monitor in real time the change in the angle between the steel cage and the horizontal plane during the lifting process; the tension sensor is used to monitor the magnitude of the tension applied by the lifting equipment to the steel cage; and the displacement sensor is used to monitor the position change of the steel cage in space.

[0017] In the first aspect, the step S8 further includes step S81:

[0018] While the standard section steel cage is being hoisted by the hoisting equipment through the hoisting point, the initial thrust of the lifting device and the initial tension of the tension sensor are obtained, and the tension change parameters in the next unit time are predicted to match the tension change parameters based on the initial thrust and initial tension.

[0019] If the thrust change parameter and the pull change parameter remain within a preset threshold range within the next unit time, the synchronous lifting is continued.

[0020] In the first aspect, the step S81 further includes:

[0021] The difference between the thrust variation parameter and the pull variation parameter is calculated using formula (1), wherein formula (1) includes:

[0022] ΔF=│ (Ft+k.Ft.Δt) - (Fl+k.Fl.Δt) │ Formula (1)

[0023] Where ΔF is the difference between the thrust and the pull, Ft is the initial thrust, Fl is the initial pull, k is the proportional coefficient, and Δt is the unit time.

[0024] In the first aspect, in step S81, determining whether the thrust change parameter and the pull change parameter remain within a preset threshold range within the next unit time includes:

[0025] If ΔF≤∈, the thrust and pull are considered matched and the lifting continues;

[0026] If ΔF>∈, it is judged that the thrust and pull forces do not match, and the lifting parameters need to be adjusted or paused.

[0027] Among them, ∈ is the preset threshold range.

[0028] In the first aspect, the S4 further includes:

[0029] A lifting hydraulic device is provided at the bottom one-third or two-fifths of the lower half support.

[0030] In the first aspect, in the step S8, after the standard section steel cage is lifted through the lifting point by using the lifting equipment, the step further includes: setting a steel baffle at the tail point position of the bracket away from the lifting point.

[0031] In a second aspect, the present invention provides a large-diameter and ultra-long pile foundation reinforcement cage construction hoisting device, the construction hoisting device comprising: a bracket, a hoisting device, a lifting device, a rotating assembly and a baffle;

[0032] Among them, the upper half bracket and the lower half bracket, the upper half bracket is used to place the steel cage for hoisting, the lower bracket and the upper bracket are connected to each other through a connecting component to form an integrated structure, and are used to support the upper bracket, a hoisting point is set at one end of the bracket, and a tail point is set on the side away from the hoisting point; the hoisting equipment is used for hoisting; the lifting device is provided at the bottom of the bracket, and is used for synchronous lifting when the hoisting equipment is hoisted; the rotating component is provided at the tail point of the bracket; and the baffle is provided at the position of the bracket.

[0033] In the second aspect, an upper semicircular support and a lower semicircular support are provided in the upper half bracket, and main supporting ribs with equal spacing are provided in the upper semicircular support and the lower semicircular support.

[0034] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0035] 1. The present invention designs a construction hoisting method for large-diameter and ultra-long pile foundation steel cages. By setting brackets, hoisting points, rotating components and lifting devices, a smooth transition of the steel cage from a horizontal to a vertical state is achieved, thereby avoiding deformation or damage of the steel cage due to its own weight and length during the hoisting process. At the same time, by setting monitoring points and monitoring components on the steel cage, the state changes during the hoisting process are monitored in real time to ensure the safety and reliability of the hoisting operation. In addition, the present invention also optimizes the production and installation process of the steel cage through segmented welding and positioning, reduces the difficulty and time of on-site splicing construction, significantly improves construction efficiency, and reduces construction risks.

[0036] 2. Furthermore, by rationally designing the support structure and hoisting process, the reliance on large hoisting equipment is reduced, and the specification requirements for hoisting equipment are lowered, thereby saving equipment rental costs. At the same time, by means of segmented hoisting and on-site welding, the complexity and risk of hoisting an overlong steel cage as a whole are avoided, and damage to the steel cage and the cost of repair due to hoisting failure are reduced. In addition, the construction method of the present invention can effectively shorten the construction period and reduce the indirect costs caused by construction delays, thereby significantly reducing the overall construction cost and improving the economic benefits of the project while ensuring construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flowchart of a method for constructing and hoisting a large-diameter and ultra-long pile foundation reinforcement cage according to an embodiment of the present invention;

[0038] Figure 2 This is a structural diagram of a large-diameter and ultra-long pile foundation reinforcement cage construction hoisting device according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the overall structure of a large-diameter and ultra-long pile foundation reinforcement cage construction hoisting device according to an embodiment of the present invention;

[0040] Figure 4 Schematic diagram of the structure of the upper semicircular support and the lower semicircular support in an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1. Upper bracket;

[0043] 2. Lifting device;

[0044] 3. Lower bracket;

[0045] 4. Buckle;

[0046] 5. Baffle;

[0047] 6. Rotating assembly;

[0048] 7. Lifting equipment;

[0049] 8. Upper semicircle support;

[0050] 9. Lower semicircle support. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0052] Example 1:

[0053] See also Figure 1 The first embodiment of the present invention provides a method for hoisting a large-diameter and ultra-long pile foundation reinforcement cage, the method comprising:

[0054] S1. Install a bracket of corresponding size according to the pre-prepared size of the steel cage; the bracket includes an upper bracket and a lower bracket, the upper bracket is used to place the steel cage for hoisting, the lower bracket is connected to the upper bracket as an integral structure, and is used to support the upper bracket;

[0055] S2. A preset lifting point on one side of the bracket, and a side away from the lifting point as the tail point;

[0056] S3. Set the rotation point according to the tail point, and configure the rotating assembly;

[0057] S4. A lifting point is set at the bottom of the lower bracket, and a lifting device is configured;

[0058] S5. Welding the outer stirrups and positioning stirrups of the first section of the steel cage at the hoisting point of the upper half of the bracket;

[0059] S6. Positioning and welding the first section of the steel cage according to the first section N, where N is a positive integer, until the standard section of the pre-prepared size steel cage is completed;

[0060] S7. Set up several monitoring points on the standard section steel cage and set up monitoring components;

[0061] S8. Use the lifting equipment to lift the steel cage of the standard section through the lifting point, and at the same time, use the rotation point as the basis for rotation, so that the steel cage of the standard section gradually rotates from a horizontal position to a vertical position;

[0062] S9. Hoist the standard section steel cage in a vertical state to the opening of the pile foundation for lowering and installation.

[0063] Specifically, the present invention designs a construction and hoisting method specifically for large-diameter and ultra-long pile foundation steel cages. By setting a bracket, hoisting points, rotating components and lifting devices, a smooth transition of the steel cage from a horizontal to a vertical state is achieved, avoiding deformation or damage of the steel cage due to its own weight and length during the hoisting process. At the same time, by setting monitoring points and monitoring components on the steel cage, the state changes during the hoisting process are monitored in real time to ensure the safety and reliability of the hoisting operation. In addition, the present invention also optimizes the production and installation process of the steel cage through segmented welding and positioning, reduces the difficulty and time of on-site splicing construction, significantly improves construction efficiency, and reduces construction risks. Furthermore, by rationally designing the bracket structure and hoisting process, the dependence on large-scale hoisting equipment is reduced, the specification requirements of the hoisting equipment are lowered, and thus the equipment rental cost is saved. At the same time, by segmented hoisting and on-site welding, the complexity and risk brought about by the overall hoisting of the ultra-long steel cage are avoided, and the damage and repair costs of the steel cage caused by hoisting failure are reduced. In addition, the construction method of the present invention can effectively shorten the construction period and reduce the indirect costs caused by construction delays, thereby significantly reducing the overall construction cost and improving the economic benefits of the project while ensuring construction quality.

[0064] In a preferred embodiment, for the step of using a lifting device to lift the standard section's steel cage through a lifting point, and using the rotation point as the rotation basis, so that the standard section's steel cage is gradually rotated from a horizontal posture to a vertical state, after the steel cage is made on the upper half bracket and welded or connected with a threaded sleeve, a reinforcing stirrup structure is set, and by simultaneously adding and setting reinforcing short bars, the reinforcing stirrups are used as the lifting point during lifting. On the one hand, the lifting load capacity of the reinforcing stirrups can be effectively improved, and the deformation and damage at the lifting point can be reduced. On the other hand, the setting of the reinforcing short bars can effectively improve the welding connection strength between the reinforcing stirrups and the corresponding longitudinal main bars, thereby improving the connection strength between the reinforcing stirrups and the steel cage as a whole, and reducing the problem of failure of the connection between the reinforcing stirrups and the longitudinal main bars caused by excessive local loads. After the hook is hung, the steel cage is slowly lifted by the lifting hydraulic device at the lifting point. The tail point can be blocked by a steel baffle to prevent the tail of the steel cage from slipping. The lifting process is based on the rotating steel shaft at the rear end, ensuring that the main reinforcement at the rear end is not subjected to single-point stress and thus bent. During the hoisting and erection process, the wire rope is gradually stressed. After lifting to a certain angle, the wire rope is slowly straightened. Once the cage is no longer bent due to its own weight and the angle of the wire rope, the cage is slowly lifted and erected, ultimately perpendicular to the ground, and lowered into the hole.

[0065] In a preferred embodiment, several monitoring points are set on the standard section steel cage, and the step of setting the monitoring component also includes: installing multiple sensors on the steel cage, including angle sensors, tension sensors and displacement sensors. The angle sensor is used to monitor the change in the angle between the steel cage and the horizontal plane during the hoisting process in real time; the tension sensor is used to monitor the magnitude of the tension applied to the steel cage by the hoisting equipment; the displacement sensor is used to monitor the position change of the steel cage in space. By setting the above sensors, the posture, force and position changes of the steel cage during the hoisting process can be monitored in real time, further enhancing the controllability and reliability of the hoisting process. This precise monitoring and control mechanism can effectively prevent unexpected situations that may occur during the hoisting process and ensure the safety of construction personnel and construction quality.

[0066] In some preferred embodiments, the step of lifting the steel cage of the standard section by the lifting point using the lifting equipment and gradually rotating the steel cage of the standard section from a horizontal position to a vertical position based on the rotation point further includes step S81:

[0067] While the standard section steel cage is being hoisted through the hoisting point using the hoisting equipment, the initial thrust of the lifting device and the initial tension of the tension sensor are obtained, and based on the initial thrust and initial tension, whether the tension change parameter in the next unit time matches the tension change parameter is predicted;

[0068] If the thrust change parameter and the pull change parameter remain within a preset threshold range within the next unit time, the synchronous lifting is continued.

[0069] In some preferred embodiments, step S81 further includes:

[0070] The difference between the thrust variation parameter and the pull variation parameter is calculated using formula (1), wherein formula (1) includes:

[0071] ΔF=│ (Ft+k.Ft.Δt) - (Fl+k.Fl.Δt) │ Formula (1)

[0072] Where ΔF is the difference between the thrust and the pull, Ft is the initial thrust, Fl is the initial pull, k is the proportional coefficient, and Δt is the unit time.

[0073] Among them, Ft+k.Ft.Δt is the predicted thrust in the next unit time, and Fl+k.Fl.Δt is the predicted pulling force in the next unit time.

[0074] In some preferred embodiments, in step S81, determining whether the thrust change parameter and the pull change parameter remain within a preset threshold range within the next unit time includes:

[0075] If ΔF≤∈, the thrust and pull are considered matched and the lifting continues;

[0076] If ΔF>∈, it is judged that the thrust and pull forces do not match, and the lifting parameters need to be adjusted or paused.

[0077] Among them, ∈ is the preset threshold range.

[0078] In some preferred embodiments, the step of setting a lifting point at the bottom of the lower support and configuring a lifting device further comprises: setting a lifting hydraulic device at the bottom one-third or two-fifths of the lower half support.

[0079] In some preferred embodiments, in the step S8, after the standard section's steel cage is lifted through the lifting point using a lifting device, the step further includes: setting a steel baffle at the tail point of the bracket away from the lifting point.

[0080] Example 2:

[0081] Please refer to Figure 2-4 , this embodiment 2 provides a large-diameter and ultra-long pile foundation steel cage construction hoisting device, the construction hoisting device includes: a bracket, a hoisting device 7, a lifting device 2, a rotating assembly 6 and a baffle 5;

[0082] The upper bracket 1 and the lower bracket 3 are connected to form an integral structure with the upper bracket via a connecting assembly and used to support the upper bracket. A lifting point is set at one end of the bracket and a tail point is set on the side away from the lifting point. A lifting device 7 is used for lifting. A lifting device 2 is set at the bottom of the bracket and is used to lift and lower the lifting device 7 synchronously when the lifting device 7 is lifted. A rotating assembly 6 is set at the tail point of the bracket. A baffle 5 is set at the position of the bracket. It further includes multiple sensors, including an angle sensor, a tension sensor, and a displacement sensor. The angle sensor is used to monitor the change in the angle between the steel cage and the horizontal plane during the lifting process in real time. The tension sensor is used to monitor the tension applied by the lifting device 7 to the steel cage. The displacement sensor is used to monitor the change in the position of the steel cage in space. In the second aspect, the upper bracket 1 is provided with an upper semicircular support 8 and a lower semicircular support 9. The upper semicircular support 8 and the lower semicircular support 9 are provided with equally spaced support bars. At the same time, the lifting device 2 is connected to the bracket via the buckle 4.

[0083] Specifically, the large-diameter and extra-long pile foundation steel cage construction hoisting device forms an integrated support structure through the connecting components of the upper bracket 1 and the lower bracket 3, providing a solid foundation for the hoisting of the steel cage. At the same time, it is equipped with an angle sensor, a tension sensor and a displacement sensor to monitor the angle, tension and position changes of the steel cage during the hoisting process in real time to ensure the safety and stability of the hoisting process. The rotating component 6 at the tail point of the bracket can flexibly adjust the direction and position of the steel cage, and cooperate with the equally spaced positioning support main reinforcement in the upper bracket 1 to further ensure the accuracy and stability of the steel cage during the hoisting process. In addition, the lifting device 2 at the bottom can be lifted and lowered synchronously with the lifting equipment 7 to achieve a smooth lifting of the steel cage. The above-mentioned technical features work together to effectively solve the technical difficulties in the hoisting process of large-diameter and extra-long pile foundation steel cages, and significantly improve the safety, accuracy and efficiency of construction.

[0084] Furthermore, an upper semicircular support and a lower semicircular support are provided in the upper half bracket, and main supporting ribs with equal spacing are provided in the upper semicircular support and the lower semicircular support.

[0085] Example 3:

[0086] 1. Select the appropriate specifications of the bracket according to the maximum length and diameter of the steel cage to be constructed, and select the appropriate crane and lifting hydraulic device according to the weight of the steel cage.

[0087] 2. Make a suitable upper support for the steel cage. Connect the upper support with I-beams or other rigid components to form a whole.

[0088] 3. The upper bracket is connected to form a whole by rigid components, so that the inner spacing between the upper and lower semicircular supports is fixed to complete the accurate docking or welding between the main reinforcements of each section of the steel cage. The upper bracket is connected together with I-beams or other rigid components to form a whole.

[0089] 4. The lower bracket, except for the 1 / 3 or 2 / 5 lifting points connected to the hydraulic lift, has a steel baffle at the tail end to block the end of the steel cage to prevent it from slipping. The lower bracket is equipped with a rotating steel shaft connected to the tail end of the upper bracket. The steel shaft is connected to two circular devices at both ends for rotating the steel shaft. The rest of the lower bracket is connected with other components to ensure that it is horizontal and perpendicular to the hydraulic lift.

[0090] 5. Make the other lower half brackets of the steel cage and connect them to the upper half brackets with clips or other means so that they can be separated when raised or lowered, and should not move with the weight of the steel cage or other factors.

[0091] 6. When making a steel cage, according to the diameter of the steel cage, replace the upper and lower semicircular supports suitable for the diameter of the steel cage in the upper half of the bracket, and weld or butt the main reinforcement of the steel cage appropriately by positioning them at equal intervals.

[0092] 7. According to the length requirements, make the second section, the third section, and the tail section in sequence. The prepared steel cage can be rotated outward by 90% through the baffle on the other side. The baffle is used to move the steel cage outward and place it aside. Steel pipes or other structures can be used to build the side to facilitate the rolling of the steel cage.

[0093] 8. Finally, connect the welded steel cages by welding or threaded sleeves, and strengthen the stirrups at the lifting points until the entire steel cage is completed.

[0094] 9. The mechanical crane should be placed on a level lifting site and the hook should be hung at the reinforced lifting point.

[0095] 10. Lift the pile foundation reinforcement cage and check whether the pile foundation reinforcement cage, slings and sling hooks are stable and reliable.

[0096] 11. Start the lifting hydraulic press and rotate the steel shaft along with the fixed point. The crane will slowly tighten the wire rope as the lifting hydraulic press rises, gradually putting stress on the wire rope. After lifting to a certain angle, the steel cage should not bend or deform due to its own weight and the angle of the wire rope. Slowly lift the steel cage upright and finally make it perpendicular to the ground.

[0097] 12. The lifting equipment moves the vertically lifted steel cage to the hole of the pile driver, slowly lowers it, and installs the pile foundation steel cage underneath.

[0098] It will be easily understood by those skilled in the art that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for hoisting a large-diameter and ultra-long pile foundation reinforcement cage, characterized in that: The method comprises: S1. Install a bracket of corresponding size according to the pre-prepared size of the steel cage; the bracket includes an upper bracket and a lower bracket, the upper bracket is used to place the steel cage for hoisting, the lower bracket is connected to the upper bracket as an integral structure, and is used to support the upper bracket; S2. A preset lifting point on one side of the bracket, and a side away from the lifting point as the tail point; S3. Set the rotation point according to the tail point, and configure the rotating assembly; S4. A lifting point is set at the bottom of the lower bracket, and a lifting device is configured; S5. Welding the outer stirrups and positioning stirrups of the first section of the steel cage at the hoisting point of the upper half of the bracket; S6. Positioning and welding the first section of the steel cage according to the first section N, where N is a positive integer, until the standard section of the pre-prepared size steel cage is completed; S7. Set up several monitoring points on the standard section steel cage and set up monitoring components; S8. Use the lifting equipment to lift the steel cage of the standard section through the lifting point, and at the same time, use the rotation point as the basis for rotation, so that the steel cage of the standard section gradually rotates from a horizontal position to a vertical position; S9. Hoist the standard section steel cage in a vertical state to the opening of the pile foundation for lowering and installation.

2. The method for constructing and hoisting a large-diameter and ultra-long pile foundation reinforcement cage according to claim 1, characterized in that: The S8 further includes: While starting the lifting device, use the lifting equipment to slowly tighten the wire rope connected to the lifting point of the steel cage as the lifting device rises, gradually applying force to the wire rope. After lifting to a certain angle, the steel cage will not bend or deform due to its own weight and the angle of the wire rope. Slowly lift the steel cage upright and finally make it perpendicular to the ground.

3. The method for constructing and hoisting a large-diameter and ultra-long pile foundation reinforcement cage according to claim 1, characterized in that: The S7 further includes: Multiple sensors are installed on the steel cage, including an angle sensor, a tension sensor and a displacement sensor. The angle sensor is used to monitor the change in the angle between the steel cage and the horizontal plane during the lifting process in real time; the tension sensor is used to monitor the magnitude of the tension applied to the steel cage by the lifting equipment; and the displacement sensor is used to monitor the position change of the steel cage in space.

4. The method for constructing and hoisting a large-diameter and ultra-long pile foundation reinforcement cage according to claim 3 is characterized in that: The step S8 further includes step S81: While the standard section steel cage is being hoisted by the hoisting equipment through the hoisting point, the initial thrust of the lifting device and the initial tension of the tension sensor are obtained, and the tension change parameters in the next unit time are predicted to match the tension change parameters based on the initial thrust and initial tension. If the thrust change parameter and the pull change parameter remain within a preset threshold range within the next unit time, the synchronous lifting is continued.

5. The method for constructing and hoisting a large-diameter and ultra-long pile foundation reinforcement cage according to claim 4, characterized in that: The step S81 further includes: The difference between the thrust variation parameter and the pull variation parameter is calculated using formula (1), wherein formula (1) includes: ΔF=│ (Ft+k.Ft.Δt) - (Fl+k.Fl.Δt) │ Formula (1) Where ΔF is the difference between the thrust and the pull, Ft is the initial thrust, Fl is the initial pull, k is the proportional coefficient, and Δt is the unit time.

6. The method for constructing and hoisting a large-diameter and ultra-long pile foundation reinforcement cage according to claim 5, characterized in that: In step S81, determining whether the thrust change parameter and the pull change parameter remain within a preset threshold range within the next unit time includes: If ΔF≤∈, the thrust and pull are considered matched and the lifting continues; If ΔF>∈, it is judged that the thrust and pull forces do not match, and the lifting parameters need to be adjusted or paused. Among them, ∈ is the preset threshold range.

7. The method for constructing and hoisting a large-diameter and ultra-long pile foundation reinforcement cage according to any one of claims 1 to 6, characterized in that: Said S4 further comprises: A lifting hydraulic device is provided at the bottom one-third or two-fifths of the lower half support.

8. The method for hoisting a large-diameter and ultra-long pile foundation reinforcement cage according to claim 1 is characterized in that: In the step S8, after the standard section's steel cage is hoisted through the hoisting point using the hoisting equipment, the step further includes: setting a steel baffle at the tail point of the bracket away from the hoisting point.

9. A large diameter and ultra-long pile foundation steel cage construction hoisting device, characterized in that: The construction hoisting device comprises: A bracket, an upper bracket (1) and a lower bracket (3), wherein the upper bracket (1) is used to place a steel cage for hoisting, the lower bracket and the upper bracket are connected to form an integral structure via a connecting assembly and are used to support the upper bracket, a hoisting point is provided at one end of the bracket, and a tail point is provided on a side away from the hoisting point; Hoisting equipment (7), used for hoisting; A lifting device (2) is provided at the bottom of the bracket and is used for synchronous lifting when the lifting device (7) is lifted; A rotating assembly (6) is provided at the tail point of the bracket; A baffle (5) is provided at the position of the bracket.

10. The large-diameter and ultra-long pile foundation reinforcement cage construction hoisting device according to claim 9, characterized in that: An upper semicircular support (8) and a lower semicircular support (9) are provided in the upper half bracket (1), and main supporting ribs with equal spacing are provided in the upper semicircular support (8) and the lower semicircular support (9).

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