Large-scale offshore photovoltaic steel truss structure assembling site arrangement, unloading and shipping method

Abstract

The invention discloses a large-scale offshore photovoltaic steel truss structure assembling site arrangement, unloading and shipping method, and relates to the technical field of offshore renewable energy sources. By reasonably arranging an offshore photovoltaic structure assembling and transferring site, the site utilization rate is increased; an orthogonal track-storage battery module vehicle transfer mode is adopted, so that the reversing transfer efficiency and the operation safety of the structure are improved; through a multi-channel-multi-trestle forwarding mode, in combination with an independent transfer channel and a Bailey temporary trestle, parallel loading and unloading and cross-field forwarding of the structure are achieved, and the storage yard occupation time is shortened; in the hoisting link, a floating crane ship is adopted, a hoisting conversion tool and a remote control unhooking system are arranged, and hoisting stability and operation efficiency are improved; in the shipping process, a small transport ship is locally transformed, and a detachable supporting platform is additionally arranged to improve the loading utilization rate. According to the method, the assembling, transferring and shipping processes of the offshore photovoltaic steel truss structure can be effectively optimized, the operation efficiency, the environmental adaptability and the economical efficiency are remarkably improved, and good flexibility and expandability are achieved.

Description

Technical Field

[0001] This invention belongs to the field of marine renewable energy technology, and specifically relates to a method for the assembly, storage and shipment of large-scale marine photovoltaic steel truss structures. Background Technology

[0002] Driven by the "dual carbon" goals and the marine economy strategy, my country's development of offshore renewable energy is accelerating, with offshore photovoltaic projects gradually expanding from tidal flats to nearshore areas. Large-scale offshore photovoltaic steel truss structures have become key supporting structures for nearshore photovoltaic power plants, with individual truss dimensions exceeding 35m × 60m, characterized by their large scale and high self-weight. The construction of steel truss structures typically involves multiple stages, including onshore assembly, on-site storage, and dockside shipment. In existing technologies, the assembly process generally takes place on idle coastal sites or rented docks, with functional areas dispersed according to work procedures, relying on large crawler cranes or truck cranes for component hoisting and relocation. During the storage stage, heavy-duty cranes are typically used in conjunction with flatbed trucks for structural transfer, with temporary tracks laid in some areas to facilitate trolley movement. The shipment stage relies on existing fixed docks or temporary piers, utilizing floating cranes to hoist the structure onto transport ships, which are then transported by sea to the offshore installation site. These methods have, to some extent, supported the construction of early offshore photovoltaic projects.

[0003] However, such steel trusses face the following prominent challenges in the "assembly-storage-shipment" process: 1. Limited suitable wharf resources: Large steel truss assembly requires a large amount of space and has high requirements for the water depth of the shipping wharf. Most of the suitable development areas in my country's coastal waters are located in the coastal economic belt, where idle wharves are already scarce, and wharves suitable for their assembly and shipping are even fewer; even if they are available, the cost of leasing and modification is high and the cycle is long.

[0004] 2. Significant conflict between safety and efficiency in transfer and storage: The steel truss can weigh up to hundreds of tons, and the precision requirements for components such as photovoltaic module installation interfaces are stringent. Traditional truck crane transfer methods are prone to structural swaying and micro-deformation due to uneven grounding pressure, which may damage the modules. Therefore, there is an urgent need to improve the assembly and transfer process.

[0005] 3. Low wharf shipping efficiency: Offshore construction is highly dependent on the "window period", but most existing wharves need to wait for the tide due to insufficient water depth at the front. In addition, the loading of steel truss roll-on / roll-off ships requires a long time for alignment. The shipping time for a single ship often exceeds 12 hours, which is far from meeting the needs of large-scale construction.

[0006] 4. Poor adaptability of shipping vessels: Due to the limited dimensions of the steel truss, shipping vessels can only transport one photovoltaic platform at a time, resulting in insufficient vessel loading capacity, low cost-effectiveness, and poor economic efficiency. It is necessary to modify the shipping vessels to improve transportation efficiency.

[0007] To address these issues, the present invention provides a method for assembling, storing, and shipping large-scale marine photovoltaic steel truss structures, in order to solve the aforementioned problems. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a method for the assembly, storage, and shipment of large-scale offshore photovoltaic steel truss structures, thereby solving the problems of low construction efficiency, quality risks, and rising costs in the current "assembly-storage-shipment" process for large-scale offshore photovoltaic steel truss structures.

[0009] This invention relates to a method for the assembly, storage, and shipment of large-scale offshore photovoltaic steel truss structures, comprising: S1. The construction site of the large-scale offshore photovoltaic structure is divided into multiple shipping sites. The shipping sites are arranged from top to bottom as follows: a single chord web member assembly site, an inter-chord web member assembly site, a main truss assembly site, a purlin assembly site, a photovoltaic panel assembly site, and a large-scale offshore photovoltaic structure shipping storage site. Orthogonal tracks are laid between the shipping sites. The construction site of the large-scale offshore photovoltaic structure is located on land near the coast. S2. Battery module vehicles are arranged along the orthogonal track. The battery module vehicles are used to transport the large marine photovoltaic steel truss structure by reversing direction. The battery module vehicles include X-direction battery module vehicles and Y-direction battery module vehicles. Lifting devices and conversion tooling are installed on the X-direction battery module vehicles and Y-direction battery module vehicles. S3. A temporary steel Bailey bridge is set up between the large offshore photovoltaic structure shipping yard and the land area adjacent to the coast. The temporary steel Bailey bridge is connected to the orthogonal track to form an independent shipping channel. An inter-site transfer track is set up between adjacent temporary steel Bailey bridges. S4. The large offshore photovoltaic steel truss structure is transported along the independent shipping channel to a predetermined position at the forefront of the temporary steel Bailey bridge. A floating crane is deployed in the sea area near the predetermined position at the forefront. The floating crane is equipped with steel truss lifting and conversion tools. The floating crane performs lifting and transport operations on the large offshore photovoltaic steel truss structure. S5. The large marine photovoltaic steel truss structure is hoisted onto the transport ship, and widened outward support platforms are symmetrically installed on both sides of the transport ship. The widened outward support platforms can be repeatedly disassembled and reassembled.

[0010] The present invention is further configured such that an area for expansion is reserved on the outer side of the construction site of the large-scale offshore photovoltaic structure, and a component processing area is set in the middle of the construction site of the large-scale offshore photovoltaic structure, and a component processing workshop is set in the component processing area.

[0011] The present invention is further configured such that the shipping sites are connected by the site interchange track, and a component transport road is provided on one side of the site interchange track. The components of the single chord web member assembly site, the inter-chord web member assembly site, the main truss assembly site, the purlin assembly site, and the photovoltaic panel assembly site are supplied by the component processing plant, and the components are transported through the component transport road.

[0012] The present invention is further configured such that the reversing transfer step is as follows: S21. The large marine photovoltaic steel truss structure is moved by the X-axis battery module vehicle to the orthogonal track-battery module vehicle transfer area; S22. Activate the lifting device on the X-direction battery module vehicle to lift the large marine photovoltaic steel truss structure with the lower conversion tooling; S23. Remotely control the Y-direction battery module vehicle to drive into the area below the raised large marine photovoltaic steel truss structure conversion fixture, the lifting device of the X-direction battery module vehicle descends, and the large marine photovoltaic steel truss structure is transferred to the lifting device of the Y-direction battery module vehicle. Remotely control the X-direction battery module vehicle to exit the orthogonal track-battery module vehicle transfer block, and complete the reversing transfer.

[0013] The present invention is further configured such that the steel Bailey temporary trestle is a reusable and reassembleable structure.

[0014] The present invention is further configured such that the steel truss hoisting and conversion fixture includes a hoisting truss, an extended triangular truss, and corner slings. The hoisting truss is connected to the crane hook of the floating crane vessel via the upper slings, and the extended triangular truss is connected to the preset hoisting points of the large offshore photovoltaic steel truss structure via the corner slings.

[0015] The invention is further configured such that a female port for inserting steel pipes is fixedly provided on the widened outward support platform, and the female port for inserting steel pipes accommodates and fixes the legs of the large marine photovoltaic steel truss structure.

[0016] The present invention is further configured such that the number of the widened outward support platforms is 4.

[0017] The beneficial effects of this invention are as follows: By optimizing the assembly, storage and shipping process of large-scale offshore photovoltaic steel truss structures, this invention significantly improves the overall operational efficiency and environmental adaptability of the structure. By rationally planning the construction site layout and setting up multiple functional assembly areas, the smooth sequential flow of various functional components is achieved. Orthogonal track-battery modular vehicles are used for structural transfer, equipped with lifting devices and conversion tooling to ensure efficient long-distance transfer of large truss structures within the site. A multi-channel, multi-trestle configuration enables parallel loading and unloading operations, with interconnected tracks connecting different sites for cross-site shipping, reducing yard occupancy and waiting time, and improving turnover efficiency. The site can be modularly expanded according to production needs, adding functional zones and shipping channels without interrupting production, flexibly matching different batch requirements. On land, a flat-laying processing-shipping-hoisting mode is used, while at sea, a lifting and tilting mode is employed, ensuring the tilt angle of the offshore photovoltaic panels while avoiding the additional tooling required for tilting on land, thus improving structural shipping efficiency. Temporary steel Bailey bridges can be quickly deployed on ordinary coastlines without leasing deep-water wharves, and can be repeatedly disassembled and reused, reducing fixed asset and site rental costs and minimizing environmental impact. Automated and controllable operation methods effectively reduce manual operation and potential errors, improving the shipping efficiency and safety of large offshore photovoltaic steel truss structures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 This is a flowchart illustrating the assembly, storage, and shipment process of the large-scale marine photovoltaic steel truss structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the assembly site layout for the large-scale marine photovoltaic steel truss structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the orthogonal track-battery module vehicle transfer according to the present invention.

[0022] Figure 4 This is a schematic diagram of the shipment of the large-scale marine photovoltaic steel truss structure of the present invention.

[0023] In the attached diagram: 1. Construction site for large-scale offshore photovoltaic structure; 2. Assembly site for single-chord web members; 3. Assembly site for inter-chord web members; 4. Assembly site for main truss; 5. Purlin assembly site; 6. Photovoltaic panel assembly site; 7. Shipment and storage yard for large-scale offshore photovoltaic structure; 8. Orthogonal track-battery module vehicle transfer area; 9. Temporary steel Bailey bridge; 10. Large-scale offshore photovoltaic steel truss structure; 11. Floating crane; 12. Transport vessel; 13. Component transport road; 14. Inter-site transfer track; 15. Site expansion as needed; 16. Component processing area; 17. Component processing workshop; 18. X-direction battery module vehicle; 19. Lifting device; 20. Y-direction battery module vehicle; 21. Conversion tooling; 22. Steel truss hoisting conversion tooling; 23. Widened outward support platform; 24. Pipe insertion joint. Detailed Implementation

[0024] The technical solutions of the present invention will now be described with reference to the accompanying drawings in the embodiments of the present invention.

[0025] Please see Figures 1-4 This invention relates to a method for the assembly, storage, and shipment of large-scale offshore photovoltaic steel truss structures, comprising: S1. The construction site 1 for the large-scale offshore photovoltaic structure is divided into multiple shipping areas, with orthogonal tracks laid between them. From top to bottom, the construction site 1 includes a single-chord web member assembly area 2, an inter-chord web member assembly area 3, a main truss assembly area 4, a purlin assembly area 5, a photovoltaic panel assembly area 6, and a large-scale offshore photovoltaic structure shipping yard area 7. The construction site 1 is located on land near the coast. An expansion area 15 is reserved on the outer side of the construction site 1 for future expansion. A component processing area 16 is located in the middle of the construction site 1, and a component processing workshop 17 is located within the component processing area 16. The shipping sites are connected by a site transfer track 14. A component transport road 13 is set up on one side of the site transfer track 14. The components of the single chord web member assembly site 2, the inter-chord web member assembly site 3, the main truss assembly site 4, the purlin assembly site 5, and the photovoltaic panel assembly site 6 are supplied by the component processing plant 17, and the components are transported through the component transport road 13.

[0026] S2. Battery module vehicles are arranged along orthogonal tracks. These vehicles are used to transfer and redirect the large offshore photovoltaic steel truss structure 10. The battery module vehicles include an X-axis battery module vehicle 18 and a Y-axis battery module vehicle 20, each equipped with a lifting device 19 and a conversion tooling 21. The reversing and transfer steps are as follows: S21. The battery module vehicle 18 carrying the large marine photovoltaic steel truss structure 10 is moved from the X direction to the orthogonal track-battery module vehicle transfer block 8; S22. Activate the lifting device 19 on the X-direction battery module vehicle 18 to lift the large marine photovoltaic steel truss structure 10 with the lower conversion tooling 21; S23. The remotely controlled Y-direction battery module vehicle 20 drives into the area below the conversion fixture 21 of the raised large marine photovoltaic steel truss structure 10, the lifting device 19 of the X-direction battery module vehicle 18 descends, and the large marine photovoltaic steel truss structure 10 is transferred to the lifting device 19 of the Y-direction battery module vehicle 20. The remotely controlled X-direction battery module vehicle 18 exits the orthogonal track-battery module vehicle transfer block 8, completing the reversing transfer.

[0027] S3. A temporary steel Bailey bridge 9 is set up between the large offshore photovoltaic structure shipping yard 7 and the land area near the coast. The temporary steel Bailey bridge 9 is connected to the orthogonal track to form an independent shipping channel. The temporary steel Bailey bridge 9 is a reusable structure. An inter-site transfer track 14 is set up between adjacent temporary steel Bailey bridges 9.

[0028] S4. The large offshore photovoltaic steel truss structure 10 is transported along an independent shipping channel to a predetermined position at the forefront of the temporary steel Bailey bridge 9. A floating crane vessel 11 is deployed in the waters near the predetermined position. The floating crane vessel 11 is equipped with a steel truss lifting and conversion fixture 22. The floating crane vessel 11 performs lifting and transport operations on the large offshore photovoltaic steel truss structure 10. The steel truss lifting and conversion fixture 22 includes a lifting truss, an extended triangular truss, and corner slings. The lifting truss is connected to the crane hook of the floating crane vessel 11 via the upper slings, and the extended triangular truss is connected to the preset lifting points of the large offshore photovoltaic steel truss structure 10 via the corner slings.

[0029] S5. The large offshore photovoltaic steel truss structure 10 is hoisted onto the transport vessel 12. Widened outward support platforms 23 are symmetrically installed on both sides of the transport vessel 12. The widened outward support platforms 23 can be repeatedly assembled and disassembled. Pile insertion steel pipe female ports 24 are fixedly installed on the widened outward support platforms 23. The pile insertion steel pipe female ports 24 accommodate and fix the legs of the large offshore photovoltaic steel truss structure 10. There are four widened outward support platforms 23.

[0030] In summary, this embodiment implements a method for the assembly, storage, and shipment of large-scale offshore photovoltaic steel truss structures. By rationally planning the layout of the construction site 1 for the large-scale offshore photovoltaic structure and setting up multiple functional assembly areas, the smooth sequential flow of each functional component is achieved. Orthogonal track-battery modular vehicles equipped with lifting devices 19 and conversion tooling 21 are used for the transfer of the large-scale offshore photovoltaic steel truss structure 10, ensuring efficient long-distance transfer of the structure within the site. A multi-channel, multi-trestle configuration enables parallel loading and unloading operations of the large-scale offshore photovoltaic steel truss structure 10, and the site-to-site transfer track 14 connects the cross-site shipment path, reducing yard occupancy and waiting time, and improving turnover efficiency. The design of expandable site area 15 as needed and reusable steel Bailey temporary trestle bridges 9 increases the applicability of the method. It flexibly adapts to different batch requirements; on land, it adopts a flat processing-shipping-hoisting mode, while at sea, it adopts a lifting and tilting mode. This ensures the tilt angle of the offshore photovoltaic panels while avoiding the additional tooling required for tilting on land, thus improving the efficiency of structural shipment. A floating crane 11 is used to hoist the large offshore photovoltaic steel truss structure 10, equipped with a special steel truss hoisting and conversion tooling 22 to reduce the risk of hoisting and transfer. During transportation, a widened outward support platform 23 and a pile-inserted steel pipe socket 24 are used to fix the large offshore photovoltaic steel truss structure 10, ensuring the stability of the structure during shipment and significantly improving the assembly, transfer efficiency, and safety of the large offshore photovoltaic steel truss structure.

[0031] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for arranging, storing, and shipping a large-scale offshore photovoltaic steel truss structure assembly site, characterized in that, include: S1. The construction site of the large-scale offshore photovoltaic structure is divided into multiple shipping sites. The shipping sites are arranged from top to bottom as follows: a single chord web member assembly site, an inter-chord web member assembly site, a main truss assembly site, a purlin assembly site, a photovoltaic panel assembly site, and a large-scale offshore photovoltaic structure shipping storage site. Orthogonal tracks are laid between the shipping sites. The construction site of the large-scale offshore photovoltaic structure is located on land near the coast. S2. Battery module vehicles are arranged along the orthogonal track. The battery module vehicles are used to transport the large marine photovoltaic steel truss structure by reversing direction. The battery module vehicles include X-direction battery module vehicles and Y-direction battery module vehicles. Lifting devices and conversion tooling are installed on the X-direction battery module vehicles and Y-direction battery module vehicles. S3. A temporary steel Bailey bridge is set up between the large offshore photovoltaic structure shipping yard and the land area adjacent to the coast. The temporary steel Bailey bridge is connected to the orthogonal track to form an independent shipping channel. An inter-site transfer track is set up between adjacent temporary steel Bailey bridges. S4. The large offshore photovoltaic steel truss structure is transported along the independent shipping channel to a predetermined position at the forefront of the temporary steel Bailey bridge. A floating crane is deployed in the sea area near the predetermined position at the forefront. The floating crane is equipped with steel truss lifting and conversion tools. The floating crane performs lifting and transport operations on the large offshore photovoltaic steel truss structure. S5. The large marine photovoltaic steel truss structure is hoisted onto the transport ship, and widened outward support platforms are symmetrically installed on both sides of the transport ship. The widened outward support platforms can be repeatedly disassembled and reassembled.

2. The method for arranging, transferring, and shipping large-scale offshore photovoltaic steel truss structures according to claim 1, characterized in that, The outer side of the construction site for the large-scale offshore photovoltaic structure has a reserved area for expansion as needed. A component processing area is set up in the middle of the construction site for the large-scale offshore photovoltaic structure, and a component processing workshop is set up in the component processing area.

3. The method for arranging, transferring, and shipping large-scale offshore photovoltaic steel truss structures according to claim 1, characterized in that, The shipping sites are connected by the site interchange track, and a component transport road is set up on one side of the site interchange track. The components of the single chord web member assembly site, the inter-chord web member assembly site, the main truss assembly site, the purlin assembly site, and the photovoltaic panel assembly site are supplied by the component processing plant, and the components are transported through the component transport road.

4. The method for arranging, transferring, and shipping the large-scale offshore photovoltaic steel truss structure assembly site according to claim 1, characterized in that, The steps of the reversing transfer are as follows: S21. The large marine photovoltaic steel truss structure is moved by the X-axis battery module vehicle to the orthogonal track-battery module vehicle transfer area; S22. Activate the lifting device on the X-direction battery module vehicle to lift the large marine photovoltaic steel truss structure with the lower conversion tooling; S23. Remotely control the Y-direction battery module vehicle to drive into the area below the raised large marine photovoltaic steel truss structure conversion fixture, the lifting device of the X-direction battery module vehicle descends, and the large marine photovoltaic steel truss structure is transferred to the lifting device of the Y-direction battery module vehicle. Remotely control the X-direction battery module vehicle to exit the orthogonal track-battery module vehicle transfer block, and complete the reversing transfer.

5. The method for arranging, transferring, and shipping large-scale offshore photovoltaic steel truss structures according to claim 1, characterized in that, The steel Bailey temporary trestle bridge is a reusable and reassembleable structure.

6. The method for arranging, transferring, and shipping large-scale offshore photovoltaic steel truss structures according to claim 1, characterized in that, The steel truss hoisting and conversion fixture includes a hoisting truss, an extended triangular truss, and corner slings. The hoisting truss is connected to the crane hook of the floating crane vessel via the upper slings, and the extended triangular truss is connected to the preset hoisting points of the large offshore photovoltaic steel truss structure via the corner slings.

7. The method for arranging, transferring, and shipping large-scale offshore photovoltaic steel truss structures according to claim 1, characterized in that, The widened outward support platform is fixedly equipped with a female port for inserting steel pipes, which accommodates and fixes the legs of the large marine photovoltaic steel truss structure.

8. The method for arranging, transferring, and shipping the large-scale offshore photovoltaic steel truss structure assembly site according to claim 1, characterized in that, The number of the widened outward support platforms is 4.

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