A kind of installation platform for offshore wind turbine prestressed anchor cage foundation

Abstract

The application discloses a kind of installation platforms for offshore wind turbine prestressed anchor bolt cage foundation, it is related to offshore wind power construction equipment technical field;The installation platform includes adjustable platform, adjustable platform is by support platform, hoisting platform and operation platform composition;Support platform is used to install anchor bolt, hoisting platform is accurately controlled by chain hoist, can effectively adjust the distance between anchor bolt and the exposed length of anchor bolt between two anchor plates, can prevent PVC pipe from being damaged during anchor bolt installation process simultaneously, improve installation precision and construction safety;Operation platform facilitates construction personnel to work at different heights, widens construction working face, can realize process synchronization, effectively improves construction progress;The application reduces dependence on large hoisting equipment, improves installation precision and construction efficiency, reduces construction cost, can be reused, with good popularization value.

Description

Technical Field

[0001] This invention belongs to the technical field of offshore wind power construction equipment, specifically relating to an installation platform for prestressed anchor bolt cage foundations of offshore wind turbines. Background Technology

[0002] With the continued growth of global demand for renewable energy, wind power, as a clean and efficient form of green energy, is widely used in onshore and offshore engineering projects. In wind power projects, the structural safety and overall stability of the wind turbine tower foundation directly affect the long-term operating efficiency and maintenance safety of the wind farm. The anchor cage, as a key component connecting the steel tower and the concrete foundation in the wind turbine foundation structure, needs to be pre-embedded before concrete pouring. High-strength bolts are used to tightly fix the tower to the foundation, bearing combined loads such as axial tensile force, shear force, and bending moment.

[0003] As the capacity of wind turbine units continues to increase, the stress complexity, precision requirements, and construction difficulty of anchor cages also increase. Currently, the installation of prestressed anchor cages in offshore wind power projects mostly adopts the "pre-assembly + overall hoisting" process. Although this process has certain advantages in on-site assembly efficiency, it has many significant problems: (1) High dependence on large lifting equipment: The overall pre-assembled structure is heavy, usually about 19.5 tons, and must be equipped with large cranes and working platforms, which greatly increases the investment in equipment and construction costs. (2) Low utilization rate of reinforcement materials: During the assembly process, a large amount of channel steel is required for temporary reinforcement. The repeated installation and dismantling not only increases the construction process, but also leads to low material reuse rate, resulting in resource waste and further increasing costs. (3) Construction and transportation are restricted by the site: Due to the constraints of the prefabrication site and dock conditions, the overall transportation cycle of the anchor cage is long and the route is complex, with great logistics uncertainty and greater coordination difficulty. (4) Low transportation efficiency: When transporting in a pre-assembled form, only about 3 sets of anchor bolt cages can be loaded in a single transport, while if transported according to raw materials, 15-20 sets can be loaded in a single transport. The loading efficiency of pre-assembled transport is significantly lower.

[0004] Therefore, developing an installation platform for offshore wind turbine prestressed anchor cage foundations that can reduce reliance on large cranes, improve installation accuracy, and enable rapid lifting, turnover, and reuse by small cranes has become an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned defects in the installation of prestressed anchor cages for offshore wind turbines in the prior art, and to provide an installation platform for the foundation of prestressed anchor cages for offshore wind turbines, so as to reduce the reliance on large lifting equipment, improve installation accuracy and construction efficiency, reduce construction costs, and realize the rapid turnover and reuse of the platform.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An installation platform for a prestressed anchor bolt cage foundation for an offshore wind turbine includes an adjustable platform, which comprises a support platform (1), a hoisting platform (2), and a working platform (3); the support platform (1) is used to install anchor bolts, and the support platform (1) includes a square box (6) welded from 20mm steel plates and a first column (7) that cooperates with the square box (6); the hoisting platform (2) includes a crossbeam (2-1) and a hand-operated hoist (5). The crossbeam (2-1) is connected to the first column (7), and the hand-operated hoist (5) is connected to the end of the crossbeam (2-1). One end of the 3m steel wire rope is connected to the hook of the hand-operated hoist (5), and the other end is connected to the upper anchor plate (12). The hand-operated hoist (5) is used to adjust the descent process of the upper anchor plate (12) with the anchor bolt (14) to control the elevation between the upper anchor plate (12) and the lower anchor plate (13) and the exposed length of the anchor bolt (14). The work platform (3) includes an upper work platform (31) and a lower work platform (32). The upper work platform (31) and the lower work platform (32) share a second column (8) to form a fixed connection between the upper and lower parts. The lower work platform (32) is equipped with a ladder (11). In the early stage of assembling the lower anchor plate (13), personnel enter the lower work platform (32) through the ladder (11) to adjust the support bolts (16) and weld the limiting plate (15) of the lower anchor plate (13). In the later stage of lowering the upper anchor plate (12) and installing the anchor bolts (14), personnel enter the upper work platform (31) through the ladder (11) to operate the hand-operated hoist (5) to adjust the accuracy of the upper anchor plate (12) and simultaneously check the status of the lower anchor plate (13) through the lower work platform (32).

[0007] In a preferred embodiment of the present invention, each column of the adjustable platform is welded with a straight threaded sleeve (41) at its bottom, and a steel bar (42) is fitted inside the straight threaded sleeve (41) to form a platform positioning device.

[0008] In a preferred embodiment of the present invention, the outer connecting truss of the upper working platform (31) is the third column (9-1), the platform panel of the upper working platform (31) is a 4mm thick patterned steel plate (9-2), and the upper working platform (31) is equipped with φ32 galvanized steel pipe railings (10).

[0009] In a preferred embodiment of the present invention, the third column (9-1) is a 10# channel steel.

[0010] In a preferred embodiment of the present invention, the first column (7) is made of 20# channel steel and the second column (8) is made of 10# channel steel.

[0011] Compared with the prior art, the present invention has the following beneficial effects: (1) Reduce reliance on large lifting equipment: The adjustable platform of the present invention adopts a modular design and reduces the platform's self-weight by optimizing the steel specifications, thereby reducing the load requirements on lifting equipment. It does not require large lifting equipment and only a small crane is needed to complete the lifting operation, which significantly reduces equipment investment and construction costs.

[0012] (2) Improve installation accuracy: The descent of the upper anchor plate can be precisely controlled by the six 5t hand-operated hoists on the hoisting platform. The spacing between the anchor bolts and the exposed length of the anchor bolts can be adjusted to ensure that the exposed length of the anchor bolts is controlled within the range of 205±1.5mm. At the same time, the platform positioning device and the adjustment measures for the concentricity and level of the upper and lower anchor plates ensure that the level of the upper and lower anchor plates is ≤3mm, the coaxiality is ≤3mm, and the maximum deviation between the center of the lower anchor plate and the center of the foundation is ≤5mm, which greatly improves the installation accuracy of the anchor bolt cage.

[0013] (3) Improve construction efficiency and shorten construction cycle: The modular design of the adjustable platform facilitates quick assembly and disassembly, enabling rapid hoisting and turnover of small cranes; the working platform expands the construction work area and enables the synchronization of processes; in addition, compared with the traditional installation method, each construction position can save 1.5 days of crane ship operation time and reduce the assembly time of the storage yard by 3.5 days, and the overall construction efficiency is expected to increase by about 50%, which greatly shortens the construction cycle.

[0014] (4) Reduce construction costs and save resources: Each construction site can reduce the construction time of 9 workers by 1.5 days and reduce the number of sea transport trips by 11, saving a total of about RMB1.1415 million in construction costs. At the same time, the platform can be reused, avoiding the waste of a large amount of temporary reinforcement channel steel in traditional processes and improving resource utilization.

[0015] (5) High adaptability and high safety: The adjustable platform has a simple structure, is easy to operate and safe and reliable. It has shown excellent adaptability in complex and ever-changing marine operating environments, and is especially suitable for the construction of high inclined pile caps. The platform panel is made of anti-slip patterned steel plate and is equipped with guardrails, which effectively ensures the safety of construction personnel.

[0016] (6) The successful application of this invention in the installation of prestressed anchor cages in offshore wind farms provides reliable technical support and practical experience for cost control and construction efficiency optimization in similar projects, and has good promotion value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an adjustable platform provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of a support platform provided in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of a platform positioning device provided in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of an upper working platform provided in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of a lower working platform (including a ladder) provided in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram illustrating the adjustment of the exposed height of an anchor bolt, as provided in an embodiment of the present invention.

[0024] Figure 7 This is a flowchart of the construction process of an anchor cage provided in an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the installation position of the upper and lower anchor plate connecting plate provided in an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram illustrating the reinforcement of the upper and lower anchor plate connection plate position according to an embodiment of the present invention.

[0027] Figure 10 This is a schematic diagram of an anchor bolt installation provided in an embodiment of the present invention. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] like Figures 1-10 As shown, this embodiment of the invention provides an installation platform for the prestressed anchor cage foundation of offshore wind turbines, including an adjustable platform. The adjustable platform includes a support platform 1, a hoisting platform 2, and a working platform 3. It aims to solve the problems of existing offshore wind turbine prestressed anchor cage installation relying on large lifting equipment, high construction costs, low transportation efficiency, and difficulty in ensuring installation accuracy.

[0030] The support platform 1 is used to install anchor bolts. The support platform 1 includes a square box 6 formed by welding 20mm steel plates and a first column 7 that cooperates with the square box 6. It can ensure that the support platform has sufficient load-bearing capacity to stably support the installation of anchor bolts, while controlling the weight of the platform itself to a certain extent and avoiding excessive load on the lifting equipment.

[0031] The hoisting platform 2 includes a crossbeam 2-1, a hand-operated hoist 5, and a 3m steel wire rope. The crossbeam 2-1 is connected to the first column 7, the hand-operated hoist 5 is connected to the end of the crossbeam 2-1, and one end of the 3m steel wire rope is connected to the hook of the hand-operated hoist 5, while the other end is connected to the upper anchor plate 12. This gives the hoisting platform 2 good structural stability and load-bearing capacity, which can meet the stress requirements during the hoisting of the anchor plate.

[0032] The hand-operated hoist 5 is used to adjust the descent of the upper anchor plate 12, which is fitted with anchor bolts 14, to control the elevation between the upper anchor plate 12 and the lower anchor plate 13, as well as the exposed length of the anchor bolts 14. In this embodiment, the precise control of the hand-operated hoist effectively adjusts the spacing between the two anchor plates and the exposed length of the anchor bolts, while also preventing damage to the PVC pipe during anchor bolt installation, thus improving installation accuracy and construction safety. The 3m steel wire rope is used in conjunction with the hand-operated hoist to achieve stable hoisting and lowering of the upper anchor plate.

[0033] The work platform 3 includes an upper work platform 31 and a lower work platform 32, which share a second column 8 to form a fixed connection. The lower work platform 32 is equipped with a ladder 11 to facilitate workers' access to and from the work platform. In this embodiment, the work platform 3 allows workers to operate at different heights, expands the work area, enables synchronized work processes, and effectively improves construction progress.

[0034] In the initial stage of assembling the lower anchor plate 13, personnel enter the lower working platform 32 via ladder 11 to adjust the support bolts 16 of the lower anchor plate 13 and weld the limiting plate 15. In the later stage of lowering the upper anchor plate 12 and installing the anchor bolts 14, personnel enter the upper working platform 31 via ladder 11 to operate the hand-operated hoist 5 to adjust the accuracy of the upper anchor plate 12. At the same time, the lower working platform 32 can simultaneously check the status of the lower anchor plate 13.

[0035] like Figure 3 As shown, each column of the adjustable platform is welded with a straight threaded sleeve 41 at its bottom, and a steel bar 42 is fitted inside the straight threaded sleeve 41 to form a platform positioning device. This positioning device can ensure the precise positioning of the adjustable platform during installation, guarantee the correspondence between the platform and the foundation center, and thus improve the installation accuracy of the anchor cage.

[0036] The outer connecting truss of the upper working platform 31 is the third column 9-1. The platform panel of the upper working platform 31 is made of 4mm thick checkered steel plate 9-2, and the upper working platform 31 is equipped with φ32 galvanized steel pipe railings 10. The third column 9-1 is made of 10# channel steel. The first column 7 is made of 20# channel steel, and the second column 8 is made of 10# channel steel. All welded connections in the adjustable platform adopt a full welding process, and the welded areas are treated with anti-corrosion measures. Figure 6 As shown, an anchor bolt protective sleeve 14-1 is provided at the end of the anchor bolt 14, a T-flange 14-2 is provided between the nut of the anchor bolt 14 and the upper anchor plate 12, a slot 14-4 is provided on the side of the anchor bolt 14, and a leveling nylon nut 14-3 is provided at the bottom of the anchor bolt 14 on the upper anchor plate 12. Figure 8 As shown, the lower and upper anchor plates are connected using connecting plates 17 during assembly.

[0037] like Figures 7-10 As shown, the construction sequence includes the following steps: Construction preparation: The adjustable platform is cut and welded in the steel yard and then transported to the crane barge for assembly.

[0038] Upper and lower anchor plate assembly: Before assembly, ensure that the stamped or sprayed markings on the connecting plate correspond to the segmented anchor plates and are both on the side where the connecting plate is located. If the connecting plate is above the anchor plate, both markings should face upwards during on-site installation; if it is below, both should face downwards to avoid flipping during installation. Use a crane to lift the anchor plates onto the assembly support platform; then insert the steel pipes into the corresponding holes of the upper and lower anchor plates, and install a nut (with a washer for the lower nut) on each of the upper and lower anchor plates. After the connecting plate aligns with the segmented anchor plates, tighten them with hexagonal head bolts and adjust the height of the two upper anchor plates. Use a tape measure to measure the pitch circle dimension of the anchor plates and a spirit level to measure the levelness of the upper anchor plates, and perform multiple measurements to ensure compliance. After assembly, weld and reinforce the splice seams on the sides and bottom of the anchor plates. The weld height between the connecting plate and the lower anchor plate end face should be 20mm. After welding, clean the weld slag and perform anti-corrosion treatment.

[0039] Installation of anchor plates under the foundation cap: Measure and determine the center point of the anchor cage, and weld 10 limiting plates at the center point. Hoist the anchor plate to a position 300mm above the assembly support platform and ensure it is stable; insert the anchor plate support bolts into the corresponding bolt holes on the anchor plate. Adjust the support bolts to ensure the anchor plate's horizontal error does not exceed 3mm, and tighten the 10 positioning bolts. Measure the concentricity and height of the anchor plate, and after ensuring they meet the requirements, fix the 10 positioning plates. Weld the anchor plate support bolts to the corresponding embedded parts, with a weld height of not less than 6mm to ensure a firm connection.

[0040] Anchor bolt installation: Hoist the assembled upper anchor plate onto the fixed lower anchor plate, and hoist the assembly platform onto the foundation. Use spacing control reinforcement to maintain the distance between the platform and the inner diameter of the lower anchor plate, and place the installation platform in the center of the foundation. The upper / lower anchor plate connection plates should be aligned, and the platform should be centered using a ruler to ensure installation accuracy and stable and convenient construction.

[0041] Use the hoist and slings of the hoisting platform to lift the upper anchor plate to a certain height, then insert the leveling anchor bolts evenly into the anchor bolt holes inside and outside the upper anchor plate, and tighten the temporary steel nuts.

[0042] After the leveling anchor bolts are installed, slowly raise the upper anchor plate and leveling anchor bolts to the height of the support platform, extend the upper anchor plate support beam, place the upper anchor plate on the support beam, and ensure that the connecting plates of the upper and lower anchor plates are on the same vertical line; insert the leveling anchor bolts into the corresponding holes of the lower anchor plate, then place a shim under the lower anchor plate and tighten the Dacromet nut (tightening torque is 300 N·m).

[0043] The installation method for other anchor bolts is as follows: Distribute the nuts evenly on the upper anchor plate, first insert the upper end of the anchor bolt into the upper anchor plate, and then insert the other end (with the steel sealing nut already installed) into the lower anchor plate. After installing the washer, tighten the Dacromet nut (tightening torque is 300 N·m).

[0044] Lowering the upper anchor plate and anchor bolts: Use a hand-operated hoist on the adjustable platform to lift the upper anchor plate (Note: Soft protection must be added to the parts in contact with the upper anchor plate to avoid damage). After aligning with the holes of the lower anchor plate, lower them sequentially in a clockwise, crisscross pattern, controlling the verticality of the anchor bolt cage. Finally, adjust the exposed length of the upper part of the leveling screw to ensure it is controlled within the range of 205±1.5mm to meet the installation accuracy requirements.

[0045] Anchor Cage Adjustment and Fixing: Adjust the concentricity of the upper and lower anchor plates. Using the center line of the bolt holes of the upper and lower anchor plates as a reference, measure the verticality. Place a measuring point every 90°, for a total of 4 points, to ensure the coaxiality of the upper and lower anchor plates. The allowable deviation of coaxiality should be controlled within ≤3mm. Simultaneously, readjust the levelness of the upper and lower anchor plates to ensure construction accuracy. The center of the lower anchor plate should correspond to the foundation center, with a maximum allowable deviation of 5mm. After adjustment, tighten the bolts using a torque wrench, setting the tightening torque to 300N·m. After acceptance, reinforce the upper anchor plate and steel pipe pile with 6 φ25mm steel bars to improve structural stability. After reinforcement, release the hand-operated hoist, remove the wire rope, and move the adjustable platform out of the foundation area to provide space for subsequent construction work.

[0046] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An installation platform for prestressed anchor bolt cage foundations of offshore wind turbines, characterized in that, The system includes an adjustable platform, comprising a support platform (1), a hoisting platform (2), and a working platform (3); the support platform (1) is used to install anchor bolts, and includes a square box (6) formed by welding 20mm steel plates and a first column (7) that cooperates with the square box (6); the hoisting platform (2) includes a crossbeam (2-1), a hand-operated hoist (5), and a 3m steel wire rope, the crossbeam (2-1) being connected to the first column (7), the hand-operated hoist (5) being connected to the end of the crossbeam (2-1), one end of the 3m steel wire rope being connected to the hook of the hand-operated hoist (5), and the other end being connected to the upper anchor plate (12); the hand-operated hoist (5) is used to adjust the descent process of the upper anchor plate (12) with anchor bolts (14) to control the elevation between the upper anchor plate (12) and the lower anchor plate (13) and the exposed length of the anchor bolts (14); The work platform (3) includes an upper work platform (31) and a lower work platform (32). The upper work platform (31) and the lower work platform (32) share a second column (8) to form a fixed connection between the upper and lower parts. The lower work platform (32) is equipped with a ladder (11). In the early stage of assembling the lower anchor plate (13), personnel enter the lower work platform (32) through the ladder (11) to adjust the support bolts (16) and weld the limiting plate (15) of the lower anchor plate (13). In the later stage of lowering the upper anchor plate (12) and installing the anchor bolts (14), personnel enter the upper work platform (31) through the ladder (11) to operate the hand-operated hoist (5) to adjust the accuracy of the upper anchor plate (12) and simultaneously check the status of the lower anchor plate (13) through the lower work platform (32).

2. The installation platform for prestressed anchor bolt cage foundations of offshore wind turbines according to claim 1, characterized in that, Each column of the adjustable platform is welded with a straight threaded sleeve (41) at its bottom, and a steel bar (42) is fitted inside the straight threaded sleeve (41) to form a platform positioning device.

3. The installation platform for prestressed anchor bolt cage foundations of offshore wind turbines according to claim 1, characterized in that, The outer connecting truss of the upper working platform (31) is the third column (9-1), the platform panel of the upper working platform (31) is a 4mm thick patterned steel plate (9-2), and the upper working platform (31) is equipped with φ32 galvanized steel pipe railings (10).

4. The installation platform for prestressed anchor cage foundations of offshore wind turbines according to claim 3, characterized in that, The third column (9-1) is made of 10# channel steel.

5. The installation platform for prestressed anchor cage foundations of offshore wind turbines according to claim 1, characterized in that, The first column (7) is made of 20# channel steel, and the second column (8) is made of 10# channel steel.

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