Split type deep water jacket structure and implementation method thereof

Abstract

This invention belongs to the field of offshore wind power technology, specifically relating to a split-type deep-water jacket structure with on-site bolt connection and its implementation method. The split design significantly reduces the structural weight and hoisting height of a single jacket structure, improving the convenience of offshore transportation and hoisting, and greatly reducing the difficulty and risk of offshore hoisting and transportation operations, thereby effectively improving construction efficiency and economy. The upper and lower jackets are reliably connected by high-strength bolts, simplifying construction, ensuring reliable force transmission, and significantly improving on-site assembly efficiency. A grouting section is provided on the outside of the flange bolts, primarily for sealing and protection, isolating the marine environment and seawater, and preventing corrosion of bolts and flanges, significantly improving the structure's corrosion resistance and durability. This invention places the grouting section above the water surface, avoiding the underwater grouting construction required for traditional integral jacket structures.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power technology, specifically relating to a split deep-water jacket structure with on-site bolt connection and its implementation method. Background Technology

[0002] my country has enormous potential for offshore wind power development, which is becoming an important support for energy structure transformation. According to calculations by the National Climate Center, the technically exploitable offshore wind power capacity in nearshore and deep-sea areas 10 to 200 km offshore and within 100 meters of water depth is approximately 2075 GW. Coastal provinces such as Zhejiang, Hainan, Guangdong, Shandong, and Fujian have significant potential for deep-sea offshore wind power development.

[0003] As near-shore wind power becomes increasingly saturated, the focus of offshore wind power is shifting towards deep-water applications. In deep-water offshore wind power projects, jacket foundations are currently the most widely used type of foundation support structure for wind turbines. Currently, traditional wind turbine jacket structures are constructed using a method of transporting them as a whole and hoisting them on-site, connecting the jacket structure to the steel pipe pile foundation through underwater grouting. However, with increasing water depth, the overall height and weight of the jacket foundation increase significantly. When the water depth exceeds 80m, the height of the wind turbine jacket will exceed 100m, and the weight will exceed 3000t. The existing hoisting height and weight of the existing ship-mounted equipment will be insufficient to complete the overall installation of the jacket foundation. Furthermore, in offshore oil engineering, the jacket foundations of large deep-sea oil platforms often adopt the slip-out launching construction scheme. However, the slip-out scheme is highly dependent on large launching barges and their slipway facilities. There are very few ship and machinery equipment available in China, making it difficult to meet the large-scale and batch construction of jacket foundations for wind turbines in large deep-sea offshore wind farms. Moreover, the construction cost of the slip-out launching scheme is significantly higher than that of the hoisting scheme, which will significantly increase the construction cost and construction period of offshore wind farms. Summary of the Invention

[0004] The primary objective of this invention is to provide a split-type offshore wind turbine jacket foundation structure that is suitable for deep water conditions, effectively reduces structural height and weight, avoids deep-water underwater grouting construction, and further improves structural reliability.

[0005] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solution: A split-type deepwater jacket structure includes: The upper jacket is on which the wind turbine foundation platform is installed and connected. The upper jacket is used to connect the wind turbine tower support structure. The lower jacket is fixed to the seabed; The upper guide frame and the lower guide frame are connected by flanges and bolts; The upper guide frame is provided with a grouting sealing structure around the flange connection area; Both the flange connection interface and the grouting sealing structure are located above sea level.

[0006] This invention divides the massive, monolithic jacket structure into two parts, designing it as a split structure consisting of an upper jacket and a lower jacket. The lower jacket can connect to foundations such as piles and suction cups, focusing on anchoring to the seabed; its height is sufficient to span deep water, providing a stable foundation. The upper jacket is responsible for connecting to and supporting the wind turbine tower. This split design significantly reduces the structural weight and lifting height of a single jacket structure, improving the convenience of offshore transportation and lifting, greatly reducing the difficulty and risk of offshore lifting and transportation operations, and effectively improving construction efficiency and economy.

[0007] Furthermore, this invention connects the upper and lower guide frames on-site using flanges and high-strength bolts, and controls the connection interface of the flanges to be above sea level. This elevates the bolt tightening operation, which requires precise operation and high-quality control, to an open-air or cabin environment above sea level, effectively ensuring the connection stability and reliability of the overall structure.

[0008] Furthermore, this invention isolates critical mechanical connections from the corrosive marine environment and seawater by setting a grouting sealing structure around the flange connection area, with the grouting sealing structure located above sea level. Simultaneously, the grouting process is a routine operation carried out under controlled conditions above the water surface, completely avoiding the difficulties and quality risks associated with traditional deep-water underwater grouting in terms of proportioning, transportation, and pressure control, thus ensuring the construction quality of both bolted connections and grouting. This invention employs a combined strategy of "mechanical connections at sea level supplemented by sealing and protective grouting," which helps improve the connection quality and stability of the overall structure, greatly enhancing the safety redundancy and durability of critical structural nodes, and providing a more solid foundation for the stable operation of the wind turbine throughout its entire life cycle.

[0009] Preferably, the upper duct frame includes several upper duct frame main legs, and also includes an upper duct frame vertical main leg located below the upper duct frame main legs and extending downward in the vertical direction; the lower duct frame includes several lower duct frame main legs, and also includes a lower duct frame vertical main leg located above the lower duct frame main legs and extending upward in the vertical direction; upper duct frame diagonal braces are provided between adjacent upper duct frame main legs, and lower duct frame diagonal braces are provided between adjacent lower duct frame main legs; transverse braces are provided between adjacent upper duct frame vertical main legs and between adjacent lower duct frame vertical main legs.

[0010] By setting vertical main legs for both the upper and lower jacket supports, on-site docking and bolt installation of the upper and lower jacket supports are facilitated. This also makes leveling and overall verticality control of the upper and lower jacket supports easier, effectively avoiding difficulties in oblique insertion construction when the jacket supports have tilted main legs. Furthermore, to enhance the overall rigidity of the vertical main legs of both the upper and lower jacket supports, this invention incorporates horizontal bracing between adjacent upper jacket support vertical main legs and between adjacent lower jacket support vertical main legs, and increases the wall thickness of the steel plates at key local nodes to improve structural strength.

[0011] Preferably, the flange includes an upper flange welded below the vertical main leg of the upper guide frame, and a lower flange welded above the vertical main leg of the lower guide frame.

[0012] Preferably, the upper and lower flanges are fastened with high-strength bolts.

[0013] Preferably, the grouting sealing structure includes an outer wall of a grouting section welded to the outside of the main leg of the upper guide frame. A grouting section for filling grouting material is formed between the outer wall of the grouting section and the outer wall of the vertical main leg of the lower guide frame. A distribution groove for guiding the flow of grouting material is provided at the bottom of the grouting section, and a sealing rubber ring is provided below the distribution groove.

[0014] By incorporating grouting sections, a sealing and protective barrier is achieved at the flange connection interface, which helps improve the overall structure's corrosion resistance and durability. Simultaneously, the use of sealing rubber rings helps prevent grout leakage.

[0015] Preferably, the distribution groove is an annular distribution groove.

[0016] Preferably, the distribution groove is provided with a plurality of openings along the circumferential direction that communicate with the grouting section.

[0017] By setting up distribution channels, it is helpful to inject grout material evenly along the circumference, thereby avoiding grouting gaps and local accumulation of grout material.

[0018] In this invention, the upper and lower guide frames are connected by flanges and high-strength bolts. The load is mainly borne by the upper flange, lower flange, and bolts. The grouting section mainly serves a sealing and corrosion-preventing function and does not bear the critical structural load-bearing function, thus requiring no high strength grade of grouting material. Therefore, on-site grouting is not a main construction procedure and can be flexibly arranged to avoid affecting the overall construction progress.

[0019] Preferably, the inner circumferential side of the outer wall of the grouting section is provided with several guide plates for guiding and positioning when the main legs of the upper guide frame and the main legs of the lower guide frame are connected.

[0020] By setting guide plates, the main legs of the upper and lower guide frames can be positioned and connected easily. At the same time, the structural dimensions of the guide plates have a limiting function, ensuring that sufficient gaps are reserved between the inner and outer walls of the grouting section, so as to ensure that the grouting gaps remain uniform and meet the gap requirements of the grouting material, thereby further ensuring the quality of grouting construction.

[0021] Preferably, the top of the grouting section and the connection point with the upper flange are provided with several vent holes.

[0022] Ventilation holes help to release air during the grouting process, and can be sealed after the grouting section is completed.

[0023] Preferably, the grouting sealing structure also includes a grouting pipeline for grouting construction. Grouting pipelines are provided on the main legs of the upper guide frame and the diagonal supports of the upper guide frame. The grouting pipelines extend downward and pass through the outer wall of the grouting section to connect with the distribution groove.

[0024] Preferably, several mooring steel pipes and lower ladders are welded vertically to the main legs of the lower jacket frame in relative positions. Support columns are welded to both the main legs of the lower and upper jacket frames in relative positions. Mooring connecting rods are connected to the support columns in the horizontal direction. The mooring steel pipes and lower ladders are welded to the mooring connecting rods. Several rest platforms are provided at the upper ends of adjacent mooring steel pipes and lower ladders. Connecting corridors are provided between adjacent rest platforms. Corridor supports are provided below the corridors. The corridor supports are welded to the cross braces located between the vertical main legs of the upper jacket frame.

[0025] Preferably, a sealed door for personnel to enter and exit is provided on the main leg of the upper jacket and at a position corresponding to the rest platform, and an upper ladder is also provided on the main leg of the upper jacket in the opposite position.

[0026] Preferably, an internal working platform is provided inside the main leg of the lower guide frame and below the flange connection area. An internal ladder extending downward and leading to the internal working platform is provided on the inside of the sealing door. A corbel and a reinforcing beam are also provided below the internal working platform.

[0027] As a further preferred option, the reinforcing beam is a grid-shaped reinforcing beam.

[0028] By incorporating berthing steel pipes, lower ladders, support columns, berthing linkages, and rest platforms, a complete berthing and personnel access route is formed, facilitating the movement of on-site installation personnel across different internal work platforms, while also promoting construction and offshore maintenance operations. The connecting corridor supports ensure safe passage. Sealed doors allow personnel access to the interior structure. The use of corbels and reinforcing beams enhances the load-bearing capacity of the internal work platforms and the overall structural stability.

[0029] This invention features a split design with upper and lower flanges connected by bolts, giving the deep-water jacket excellent transport and installation adaptability. The grouting seal and internal working platform further enhance the structural integrity and maintainability, making it suitable for the construction needs of deep-sea wind power projects.

[0030] The second objective of this invention is to provide a construction and installation method for a split-type deep-water jacket structure for offshore wind power that can shorten the construction period.

[0031] The implementation method of the split-type deepwater jacket structure as described above includes the following steps: S1: Complete the prefabrication and welding of the upper jacket, lower jacket and wind turbine foundation platform, and transport them to the target sea area; S2: Install and fix the lower guide frame at the predetermined position on the seabed; S3: Hoist the upper jacket frame and connect it to the lower jacket frame on site using flanges and bolts; S4: Grouting is carried out within the grouting sealing structure located above sea level to complete the sealing.

[0032] Preferably, in step S2, a suction bucket or pile foundation can be used to securely embed the lower guide frame into the predetermined position on the seabed.

[0033] Preferably, in step S3, a guide plate is provided on the inner side of the outer wall of the grouting section to connect the outer wall of the grouting section welded to the outer side of the main leg of the upper guide frame with the outer side of the main leg of the lower guide frame, thereby achieving preliminary positioning and docking.

[0034] Preferably, in step S3, the construction workers complete the bolt installation work through the internal working platform set inside the main leg of the lower guide frame.

[0035] Preferably, in step S4, the grout is transported to the distribution tank through the grouting pipeline and injected evenly into the grouting section in the circumferential direction.

[0036] As a further preferred embodiment, the implementation method of the split-type deepwater jacket structure described above includes the following steps: S1: Land-based prefabrication and maritime transport The prefabrication and welding of the upper jacket, lower jacket, and wind turbine foundation platform are completed at the land-based factory, and the upper and lower flanges are welded to their corresponding positions on the upper and lower jackets, respectively. Subsequently, the above structural components are transported to the target sea area in preparation for offshore hoisting operations.

[0037] S2: Substructure and Foundation Installation Floating crane vessels were used for the installation of the foundation and substructure to ensure the stable installation of the substructure.

[0038] S3: Upper Structure Erection and Connection A floating crane vessel was used to hoist the upper jacket, allowing the outer wall of the grouting section welded to the outside of the upper jacket's main legs to fit onto the outside of the lower jacket's main legs. Precise alignment was achieved using guide plates installed inside the grouting section's outer wall. Afterward, the flange bolts connecting the mooring linkage and the support column were connected. Workers then accessed the internal working platform inside the lower jacket's main legs via a sealed door and internal ladder to install the bolts.

[0039] S4: Grouting Operation Continuous and uniform grouting is carried out on the grouting section to complete the sealing.

[0040] Therefore, the present invention has the following beneficial effects: (1) The present invention significantly reduces the structural weight and hoisting height of a single jacket structure through a split design, which helps to improve the convenience of marine transportation and hoisting, greatly reduces the difficulty and risk of marine hoisting and transportation operations, and thus effectively improves construction efficiency and economy; (2) The upper and lower guide frames of the present invention are provided with vertical main legs, and the horizontal flange connection is provided between the vertical main legs of the upper guide frame and the vertical main legs of the lower guide frame, which is conducive to the on-site docking and bolt installation of the upper and lower guide frames, and also facilitates the leveling of the upper and lower guide frames and the control of the overall verticality. (3) The upper and lower guide frames of the present invention are reliably connected by high-strength bolts, which makes construction simple and force transmission reliable, and significantly improves the efficiency of on-site assembly. A grouting section is provided on the outside of the flange bolts, which is mainly used for sealing and protection to isolate seawater and prevent corrosion at the contact point between the bolts and the flange, which can significantly improve the corrosion resistance and durability of the structure; (4) The present invention sets the grouting section above the water surface, avoiding the underwater grouting construction of the traditional integral guide frame structure. This design directly avoids the uncontrollable factors of underwater grouting construction under deep water conditions, and also reduces the demand for high-strength, water-resistant special grouting materials. Conventional grouting materials can be used for construction, which significantly saves material costs and simplifies the construction process, and facilitates later operation and maintenance; (5) Since the grouting section mainly serves a sealing function in this invention and does not bear the main structural load, the grouting operation does not constitute the critical path for the construction of the jacket foundation. During the construction process, the grouting procedure can be flexibly arranged without waiting for the grouting material to reach the design strength, which greatly shortens the window period for offshore operations and speeds up the construction progress. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of the split-type deep-water jacket structure of the present invention.

[0042] Figure 2 This is a schematic diagram of the structure at the connection between the main legs of the upper and lower guide frame of the present invention; wherein, Figure 2 A in the diagram represents the structural connection between the upper and lower guide frame main legs. Figure 2 B in the diagram is a magnified view of the circled area in A.

[0043] Figure 3 This is a schematic diagram of the lower flange of the present invention.

[0044] Figure 4 This is a distribution diagram of the guide plate of the present invention.

[0045] Figure 5 This is a top view of the connection between the mooring steel pipe, the mooring connecting rod, and the lower ladder of the present invention.

[0046] Figure 6 This is a top view of the rest platform and connecting corridor of the present invention.

[0047] Figure 7 This is a schematic diagram of the connection structure between the internal ladder and the internal working platform inside the main leg of the lower guide frame of the present invention.

[0048] Figure 8 This is a schematic diagram of the distribution groove of the present invention; wherein, Figure 8 In the diagram, A represents the connection structure between the outer wall of the grouting section, the grouting pipeline, and the distribution trench. Figure 8 B in the diagram is a schematic diagram of the connection structure between the outer wall of the grouting section and the distribution groove. Figure 8 C in the diagram is a top view of the outer wall of the grouting section, the connection between the grouting pipeline and the distribution trench.

[0049] In the diagram: 1. Upper jacket; 2. Fan foundation platform; 3. Lower jacket; 4. Flange; 5. Bolt; 6. Grouting sealing structure; 7. Main leg of upper jacket; 8. Vertical main leg of upper jacket; 9. Main leg of lower jacket; 10. Vertical main leg of lower jacket; 11. Diagonal brace of upper jacket; 12. Diagonal brace of lower jacket; 13. Horizontal brace; 14. Upper flange; 15. Lower flange; 16. Outer wall of grouting section; 17. Grouting section; 18. Distribution groove; 19. Sealing rubber ring; 20. Guide plate; 21. Grouting pipeline; 22. Mooring steel pipe; 23. Lower ladder; 24. Support column; 25. Mooring connecting rod; 26. Resting platform; 27. Connecting corridor; 28. Connecting corridor support; 29. ​​Sealing door; 30. Upper ladder; 31. Internal working platform; 32. Internal ladder; 33. Corridor; 34. Reinforcing beam. Detailed Implementation

[0050] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0051] Example 1 This embodiment provides a split-type deep-water jacket structure.

[0052] like Figure 1-4 As shown, a split-type deep-water jacket structure is presented, comprising an upper jacket 1 and a lower jacket 3, to reduce the weight of individual structures and hoisting height, thereby improving the convenience of offshore transportation and hoisting. The lower jacket 3 can be fixed to the seabed via suction buckets or pile foundations. A wind turbine foundation platform 2 is installed and connected above the upper jacket 1, which is used to connect the wind turbine tower support structure. In one embodiment, the upper jacket 1 and the wind turbine foundation platform 2 are welded together as a whole. The upper jacket 1 and the lower jacket 3 are connected by flanges 4 and bolts 5. A grouting sealing structure 6 is provided around the flange 4 connection area of ​​the upper jacket 1, and both the flange 4 connection interface and the grouting sealing structure 6 are located above sea level. Furthermore, to avoid underwater construction, the flange 4 interface elevation is more than 3 meters above sea level.

[0053] In one embodiment, the upper jacket support 1 includes several upper jacket support main legs 7, and also includes upper jacket support vertical main legs 8 located below the upper jacket support main legs 7 and extending downward in the vertical direction. The lower jacket support 3 includes several lower jacket support main legs 9, and also includes lower jacket support vertical main legs 10 located above the lower jacket support main legs 9 and extending upward in the vertical direction. In one embodiment, both the upper jacket support vertical main legs 8 and the lower jacket support vertical main legs 10 are approximately 3m long. Upper jacket support diagonal braces 11 are provided between adjacent upper jacket support main legs 7, and lower jacket support diagonal braces 12 are provided between adjacent lower jacket support main legs 9. Horizontal braces 13 are provided between adjacent upper jacket support vertical main legs 8 and between adjacent lower jacket support vertical main legs 10.

[0054] By setting up vertical main legs 8 for the upper jacket and 10 for the lower jacket, it is beneficial to connect the upper jacket 1 and the lower jacket 3 on-site and install the bolts 5. It also facilitates the leveling of the upper jacket 1 and the lower jacket 3 and the control of their overall verticality, effectively avoiding the difficulties of oblique insertion construction when the jacket has tilted main legs. In addition, in order to improve the overall rigidity of the vertical main legs 8 and 10 of the upper jacket, the present invention sets up cross braces 13 between adjacent vertical main legs 8 of the upper jacket and between adjacent vertical main legs 10 of the lower jacket, and increases the wall thickness of the steel plates at key local nodes to improve structural strength.

[0055] In one embodiment, flange 4 includes an upper flange 14 welded below the vertical main leg 8 of the upper jacket support, and a lower flange 15 welded above the vertical main leg 10 of the lower jacket support.

[0056] In one implementation, the upper flange 14 and the lower flange 15 are fastened using high-strength bolts 5.

[0057] In one embodiment, the grouting sealing structure 6 includes a grouting section outer wall 16 welded to the outside of the upper guide frame main leg 7. A grouting section 17 for filling grouting material is formed between the grouting section outer wall 16 and the outer wall of the lower guide frame vertical main leg 10. A distribution groove 18 for guiding the flow of grouting material is provided at the bottom of the grouting section 17, and a sealing rubber ring 19 is provided below the distribution groove 18.

[0058] By setting up the grouting section 17, the connection interface of flange 4 is sealed and protected, which helps to improve the corrosion resistance and durability of the overall structure. At the same time, the sealing rubber ring 19 helps to prevent grout leakage.

[0059] In one embodiment, the distribution groove 18 is an annular distribution groove 18.

[0060] In one implementation, the distribution groove 18 is provided with a plurality of openings along the circumferential direction that communicate with the grouting section 17.

[0061] In another implementation, the distribution groove 18 is provided with 6 openings along the circumferential direction that are connected to the grouting section 17.

[0062] By setting the distribution groove 18, it is helpful to inject the grout material evenly in the circumferential direction, thereby avoiding grouting gaps and local accumulation of grout material.

[0063] In this invention, the upper and lower guide frames are connected by flanges 4 and high-strength bolts 5. The load is mainly borne by the upper flange 14, the lower flange 15, and the bolts 5. The grouting section 17 mainly serves a sealing and corrosion-preventing function and does not bear the critical structural load-bearing function, thus requiring no high strength grade of grouting material. Therefore, on-site grouting is not a main construction procedure and can be flexibly arranged to avoid affecting the overall construction progress.

[0064] As one implementation method, such as Figure 2 As shown, the inner circumferential side of the outer wall 16 of the grouting section is provided with several guide plates 20 for guiding and positioning when the main leg 7 of the upper guide frame and the main leg 9 of the lower guide frame are connected.

[0065] By setting the guide plate 20, it is easy to position and connect the upper main leg 7 and the lower main leg 9 of the guide frame. At the same time, the structural dimensions of the guide plate 20 have a limiting function, so that sufficient gaps are reserved between the inner and outer walls of the grouting section 17, ensuring that the grouting gap remains uniform and meets the gap requirements of the grouting material, thereby further ensuring the quality of grouting construction.

[0066] As one implementation, several vent holes are provided at the top of the grouting section 17 and at the connection with the upper flange 14.

[0067] As another implementation, four vent holes are provided at the top of the grouting section 17 and at the connection with the upper flange 14.

[0068] Ventilation holes are provided to help release air during the grouting process, and they can be sealed after the completion of grouting section 17.

[0069] As one implementation method, such as Figure 1 and Figure 8 As shown, the grouting sealing structure 6 also includes a grouting pipeline 21 for grouting construction. Grouting pipelines 21 are installed on both the upper guide frame main leg 7 and the upper guide frame diagonal brace 11. The grouting pipeline 21 extends downwards and passes through the outer wall 16 of the grouting section to connect with the distribution groove 18. That is, the grouting pipeline 21 is led out from the top of the upper guide frame main leg 7, fixedly arranged along the outside of the upper guide frame main leg 7 and the upper guide frame diagonal brace 11 by a support structure, and extends downwards. After passing through the outer wall 16 of the grouting section, it guides the grouting material into the distribution groove 18, ultimately ensuring that the grouting material is evenly injected into the grouting section 17.

[0070] As one implementation method, such as Figure 1 , Figure 5-6As shown, several mooring steel pipes 22 and lower ladders 23 are welded vertically to the lower main leg 9 of the jacket structure, which is in a relatively opposite position. Support columns 24 are welded to both the lower main leg 9 and the upper main leg 7 of the jacket structure, which are in a relatively opposite position. Mooring connecting rods 25 are connected horizontally to the support columns 24, and adjacent mooring steel pipes 22 are connected by the mooring connecting rods 25. Several resting platforms 26 extend upwards from the upper ends of adjacent mooring steel pipes 22 and lower ladders 23, and adjacent resting platforms 26 are connected by connecting corridors 27. Connecting corridor supports 28 are provided below the connecting corridors 27, and the connecting corridor supports 28 are welded to the cross braces 13 located between the vertical main legs 8 of the upper jacket structure.

[0071] As one implementation method, such as Figure 1 , Figure 6-7 As shown, a sealed door 29 for personnel to enter and exit is provided on the upper main leg 7 of the jacket frame and at a position corresponding to the rest platform 26. An upper ladder 30 is also provided on the upper main leg 7 of the jacket frame in a relative position.

[0072] As one implementation method, such as Figure 2 , Figure 7 As shown, an internal working platform 31 is provided inside the main leg 9 of the lower guide frame and below the flange 4 connection area. An internal ladder 32 extending downward and leading to the internal working platform 31 is provided on the inside of the sealing door 29. A corbel 33 and a reinforcing beam 34 are also provided below the internal working platform 31.

[0073] As another implementation, the reinforcing beam 34 is a grid-shaped reinforcing beam 34.

[0074] As one implementation, the internal working platform 31 is located about 1.0m below the interface between the upper flange 14 and the lower flange 15, and the internal space diameter of the main leg 9 of the lower guide frame is about 1.5m, which meets the needs of personnel passage and bolt 5 installation.

[0075] By incorporating berthing steel pipes 22, lower ladders 23, support columns 24, berthing linkages 25, and rest platforms 26, a complete berthing and personnel access route is formed, facilitating the movement of on-site installation personnel across different internal work platforms 31, while also promoting construction and offshore maintenance operations. The connecting corridor supports 28 ensure safe passage. Sealed doors 29 allow personnel access to the interior structure. The corbels 33 and reinforcing beams 34 enhance the load-bearing capacity of the internal work platforms 31 and improve the overall structural stability.

[0076] The present invention, through its split design and connection with the upper flange 14, lower flange 15 and bolts 5, enables the deep-water jacket to have good transport and installation adaptability. The grouting seal and the setting of the internal working platform 31 further enhance the integrity and maintainability of the structure, making it suitable for the construction needs of deep-sea wind power projects.

[0077] Example 2 This embodiment provides a construction and installation method for a split-type deep-water jacket structure for offshore wind power that can shorten the construction period.

[0078] The implementation method of the split-type deepwater jacket structure as described above includes the following steps: S1: Complete the prefabrication and welding of the upper jacket 1, lower jacket 3 and wind turbine foundation platform 2, and transport them to the target sea area; S2: Install and fix the lower guide frame 3 at the predetermined position on the seabed; S3: Hoist the upper jacket 1, and connect the upper jacket 1 and the lower jacket 3 on site using flanges 4 and bolts 5; S4: Grouting is carried out in the grouting and sealing structure 6 located above sea level to complete the sealing.

[0079] In one implementation, in step S2, the lower guide frame 3 can be securely embedded into the predetermined position on the seabed using a suction bucket or pile foundation.

[0080] In one implementation, in step S3, the guide plate 20 provided on the inner side of the grouting section outer wall 16 is used to connect the grouting section outer wall 16 welded to the outer side of the upper guide frame main leg 7 with the outer side of the lower guide frame main leg 9, so as to achieve preliminary positioning and docking.

[0081] In one implementation, in step S3, the construction workers complete the bolt 5 installation work through the internal working platform 31 set inside the main leg 9 of the lower guide frame.

[0082] In one implementation, in step S4, the grout is transported to the distribution tank 18 through the grouting pipeline 21 and uniformly injected into the grouting section 17 in the circumferential direction.

[0083] As another embodiment, the implementation method of the split-type deepwater jacket structure described above includes the following steps: S1: Land-based prefabrication and maritime transport The prefabrication and welding of the upper jacket 1, lower jacket 3, and wind turbine foundation platform 2 are completed at the land-based factory, and the upper flange 14 and lower flange 15 are welded to the corresponding positions of the upper jacket 1 and lower jacket 3, respectively. Subsequently, the above-mentioned structural components are transported to the target sea area for offshore hoisting operations.

[0084] S2: Substructure and Foundation Installation The lower jacket 3 was lifted to the predetermined position on the seabed using a floating crane vessel, and then foundation construction was carried out to ensure the stable installation of the lower structure.

[0085] S3: Upper Structure Erection and Connection A floating crane vessel is used to hoist the upper jacket 1, allowing the outer wall 16 of the grouting section welded to the outside of the main leg 7 of the upper jacket to be fitted onto the outside of the main leg 9 of the lower jacket. Precise alignment is achieved using guide plates 20 installed inside the outer wall 16 of the grouting section. Afterwards, the flange bolt connection between the mooring link 25 and the support column 24 is completed. Workers then access the internal working platform 31 inside the main leg 9 of the lower jacket via a sealed door 29 and an internal ladder 32 to install the bolts 5.

[0086] S4: Grouting Operation Continuous and uniform grouting was carried out on grouting section 17 to complete the sealing.

[0087] The above description is merely a detailed explanation of preferred embodiments and principles of the present invention. For those skilled in the art, there may be changes in specific implementation methods based on the ideas provided by the present invention, and these changes should also be considered within the scope of protection of the present invention.

Claims

1. A split-type deep-water jacket structure, characterized in that, include: The upper jacket (1) is connected to the wind turbine foundation platform (2), and the upper jacket (1) is used to connect the wind turbine tower support structure; The lower jacket (3) is fixed to the seabed; The upper guide frame (1) and the lower guide frame (3) are connected by flanges (4) and bolts (5); The upper guide frame (1) is provided with a grouting sealing structure (6) around the flange (4) connection area. The connection interface of the flange (4) and the grouting sealing structure (6) are both located above sea level.

2. The split-type deep-water jacket structure according to claim 1, characterized in that, The upper duct frame (1) includes several upper duct frame main legs (7), and also includes an upper duct frame vertical main leg (8) located below the upper duct frame main legs (7) and extending downward in the vertical direction; the lower duct frame (3) includes several lower duct frame main legs (9), and also includes a lower duct frame vertical main leg (10) located above the lower duct frame main legs (9) and extending upward in the vertical direction; upper duct frame diagonal braces (11) are provided between adjacent upper duct frame main legs (7), and lower duct frame diagonal braces (12) are provided between adjacent lower duct frame main legs (9); horizontal braces (13) are provided between adjacent upper duct frame vertical main legs (8) and between adjacent lower duct frame vertical main legs (10).

3. The split-type deep-water jacket structure according to claim 2, characterized in that, The flange (4) includes an upper flange (14) welded below the vertical main leg (8) of the upper jacket and a lower flange (15) welded above the vertical main leg (10) of the lower jacket.

4. A split-type deep-water jacket structure according to claim 2, characterized in that, The grouting sealing structure (6) includes an outer wall (16) of a grouting section welded to the outside of the main leg (7) of the upper guide frame. A grouting section (17) for filling grouting material is formed between the outer wall (16) of the grouting section and the outer wall of the vertical main leg (10) of the lower guide frame. A distribution groove (18) for guiding the flow of grouting material is provided at the bottom of the grouting section (17). A sealing rubber ring (19) is provided below the distribution groove (18).

5. A split-type deep-water jacket structure according to claim 4, characterized in that, The inner circumferential side of the outer wall (16) of the grouting section is provided with several guide plates (20) for guiding and positioning when the upper main leg (7) of the guide frame and the lower main leg (9) of the guide frame are connected.

6. A split-type deep-water jacket structure according to claim 4, characterized in that, The grouting sealing structure (6) also includes a grouting pipeline (21) for grouting construction. The upper guide frame main leg (7) and the upper guide frame diagonal brace (11) are both equipped with grouting pipelines (21). The grouting pipeline (21) extends downward and passes through the outer wall (16) of the grouting section to connect with the distribution groove (18).

7. A split-type deep-water jacket structure according to claim 2, characterized in that, Several mooring steel pipes (22) and lower ladders (23) are welded vertically on the lower main leg (9) of the jacket frame in a relative position. Support columns (24) are welded on both the lower main leg (9) and the upper main leg (7) of the jacket frame in a relative position. Mooring connecting rods (25) are connected horizontally on the support columns (24). The mooring steel pipes (22) and lower ladders (23) are welded to the mooring connecting rods (25). Several rest platforms (26) are provided at the upper ends of adjacent mooring steel pipes (22) and lower ladders (23). A connecting corridor (27) is connected between adjacent rest platforms (26). A connecting corridor support (28) is provided below the connecting corridor (27). The connecting corridor support (28) is welded to the cross brace (13) located between the vertical main legs (8) of the upper jacket frame.

8. A split-type deep-water jacket structure according to claim 7, characterized in that, A sealed door (29) for personnel to enter and exit is provided on the upper main leg (7) of the jacket and in a position corresponding to the rest platform (26). An upper ladder (30) is also provided on the upper main leg (7) of the jacket in a relative position.

9. A split-type deep-water jacket structure according to claim 8, characterized in that, An internal working platform (31) is provided inside the main leg (9) of the lower guide frame. An internal ladder (32) extending downward and leading to the internal working platform (31) is provided inside the sealing door (29). A corbel (33) and a reinforcing beam (34) are also provided below the internal working platform (31).

10. A method for implementing a split-type deep-water jacket structure as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Complete the prefabrication and welding of the upper jacket (1), lower jacket (3) and wind turbine foundation platform (2), and transport them to the target sea area; S2: Install and fix the lower guide frame (3) at the predetermined position on the seabed; S3: Hoist the upper guide frame (1) and connect the upper guide frame (1) and the lower guide frame (3) on site using flanges (4) and bolts (5); S4: Grouting is carried out in the grouting sealing structure (6) located above sea level to complete the sealing.

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