A segmented splicable jacket structure and construction method

Abstract

The present invention relates to a segmented, splicable jacket structure and construction method. The jacket is divided into an upper jacket structure and a lower jacket structure, which are connected and fixed by a guide traction device and a guide docking structure. The jacket structure of the present invention is simple in construction, reliable in splicing, secure in connection, easy to construct, and quick to install. It can achieve precise segmented splicing and installation of high jacket foundations and is suitable for deeper waters. It also eliminates the need for large-scale lifting equipment, effectively reducing construction costs and providing a solution for my country's offshore wind power expansion into the deep sea.

Description

Technical Field

[0001] The present invention relates to a foundation type for offshore wind turbines and offshore booster stations in offshore wind farms. The foundation type is a segmented, splicable jacket foundation structure with automatic docking and fastening functions, and is applicable to the technical field of offshore wind power generation. Background Art

[0002] Currently, the distribution of offshore wind farms is shifting from nearshore to deepwater coastal areas. The jacket foundations, a mature technology widely used in offshore wind turbines and offshore booster stations, will inevitably increase in design height and construction difficulty as water depth increases.

[0003] The foundation of high jackets (over 50m) will directly cause technical difficulties in construction such as offshore transportation, lifting and installation, as well as high installation costs caused by large lifting equipment. These are not conducive to the large-scale, base-based and sustainable development of my country's offshore wind power.

[0004] As cost reduction, efficiency improvement and rapid construction of offshore wind farms become new development trends, there is an urgent need to research and develop a segmented, spliced ​​jacket structure with automatic docking and fastening functions. Summary of the Invention

[0005] The first objective of the present invention is to provide a segmented, joinable jacket structure that features simple construction, reliable joining, secure connections, easy construction, and quick installation. This structure enables precise segmented joining and installation of high-rise jacket foundations, making it suitable for large-scale development of deep-sea wind resources. Furthermore, it eliminates the need for large-scale lifting equipment, effectively reducing construction costs. To this end, the present invention employs the following technical solutions:

[0006] A segmented, splicable jacket structure is characterized in that the jacket is divided into an upper jacket structure and a lower jacket structure, and the upper jacket structure and the lower jacket structure are connected and fixed by a guide traction device and a guide docking structure, thereby ensuring that the jacket structures are accurately and reliably docked and firmly connected.

[0007] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0008] The guide and traction device retains an upper guide ring and a lower guide ring welded to the lower end of the main leg of the upper jacket structure and the upper end of the main leg of the lower jacket structure respectively. The upper fixed pulley is welded to the upper part of the upper guide ring, and the lower fixed pulley is welded to the lower part of the lower guide ring. There are openings on the upper guide ring and the lower guide ring for the traction rope to pass through. When the upper and lower jacket structures are docked, the openings on the upper guide ring and the lower guide ring can be aligned to ensure precise docking of the upper and lower jacket structures.

[0009] The guide docking structure includes a semi-ellipsoidal docking structure at the bottom of the main leg of the upper jacket structure and a docking structure at the top of the main leg of the lower jacket structure; the bottom center of the semi-ellipsoidal docking structure at the bottom of the main leg of the upper jacket structure is a cylindrical structure with a transverse through hole; the docking structure at the top of the main leg of the lower jacket structure includes a semi-ellipsoidal tray, a rigid support structure with a built-in fastening mechanism, and a crossbeam, and the fastening structure cooperates with the cylindrical structure with the transverse through hole; the crossbeam is welded to the inside of the main leg of the lower jacket structure, the rigid support structure is welded to the crossbeam, and the semi-ellipsoidal tray is welded to the rigid support structure and the top of the main leg of the lower jacket structure.

[0010] The rigid support structure of the built-in fastening mechanism includes a rigid pillar, a first compressible spring and a second compressible spring, a rigid cylindrical locking pin connected to the first compressible spring, and a cylindrical support block connected to the second compressible spring; the rigid pillar is provided with a central large diameter positioning hole and a small diameter locking hole and a variable cross-section locking hole perpendicular to the large diameter positioning hole; the variable cross-section locking hole and the small diameter locking hole are on the same straight line and are respectively located on both sides of the radial direction of the central large diameter positioning hole, and the first compressible spring is arranged in the variable cross-section locking hole; the second compressible spring and the cylindrical block are arranged in the central large diameter positioning hole, and the cylindrical block can move up and down in the central large diameter positioning hole, and the cylindrical block is supported on the second compressible spring; before the cylindrical structure is not inserted into the central large diameter positioning hole, the cylindrical block is blocked between the small diameter locking hole and the variable cross-section locking hole, the rigid cylindrical locking pin is located in the variable cross-section locking hole, the diameter of the transverse through hole also matches the rigid cylindrical locking pin, so that it can pass through the transverse through hole, and the diameter of the central large diameter positioning hole matches the cylindrical structure, so that the cylindrical structure can be inserted into the central large diameter positioning hole.

[0011] A second objective of the present invention is to provide a method for splicing and fastening segmented, connectable jacket foundations. This method is suitable for segmented splicing of high jacket foundations in deepwater areas, reducing the construction risks of large offshore hoisting equipment. It enables precise, assembled, and secure splicing of segmented high jacket foundations, improving onshore construction efficiency and reducing offshore transportation and installation costs. To this end, the present invention employs the following technical solutions:

[0012] A method for splicing and fastening a splicable jacket foundation is characterized by: dividing the high jacket foundation into upper and lower sections, and then achieving precise docking and secure connection of the upper and lower jacket structures by means of the guide traction device and guide docking structure provided on the main legs of the upper and lower jacket structures. A segmented assembly and splicing high jacket foundation structure is creatively proposed, employing shore-side segmented construction, offshore segmented transportation, and precise docking installation technology, including the following steps:

[0013] 1) The upper and lower jacket structures of the high jacket foundation have been constructed in sections onshore and transported to the construction site in sections offshore;

[0014] 2) Before lifting, pass the traction rope from bottom to top through the guide ring welded to the top of the main leg of the lower jacket structure, and fix both ends to the reel located on the construction vessel;

[0015] 3) The lifting equipment lifts the lower jacket structure and, when lowering the lower jacket structure, precisely lowers the lower jacket structure to the designated installation position by pulling the traction rope, completing the installation of the lower jacket structure;

[0016] 4) Pass the upper end of the traction rope, which has passed through the lower jacket guide ring and is fixed to the construction vessel, from bottom to top through the guide ring welded to the lower end of the upper jacket structure main leg, and fix it to the reel located on the construction vessel;

[0017] 5) The hoisting equipment lifts the upper jacket structure and pulls the traction rope to achieve precise docking of the upper and lower jacket structures when lowering the upper jacket structure;

[0018] 6) After the end of the semi-ellipsoidal docking structure of the upper jacket structure enters the semi-ellipsoidal tray of the lower jacket structure, slowly lower the upper jacket structure and tighten the traction rope to ensure that the docking parts of the upper and lower jacket structures are in the same docking plane;

[0019] 7) After the end of the upper jacket structure docking structure enters the rigid support column of the lower jacket structure docking structure, the upper jacket structure continues to be slowly lowered. At this time, the cylindrical structure end of the upper jacket structure docking structure will squeeze the cylindrical block connected to the second compressible spring in the rigid support column of the lower jacket structure. The second compressible spring is compressed, and the cylindrical block slowly moves downward along with the cylindrical structure end of the upper jacket structure docking structure.

[0020] 8) When the semi-ellipsoidal structure of the upper jacket docking structure contacts the semi-ellipsoidal tray of the lower jacket docking structure, the rigid cylindrical locking pin connected to the first compressible spring in the variable-section locking hole of the rigid support strut just passes through the transverse through-hole of the cylindrical structure at the semi-ellipsoidal end of the upper jacket docking structure and extends into the small-diameter locking hole, thereby achieving a secure connection of the segmented jackets. This can withstand the vertical and horizontal loads of the wind turbine structure or offshore booster station structure, as well as small eccentric loads.

[0021] 9) Release the traction rope. At this point, the segmented spliced ​​jacket foundation is installed.

[0022] The height of the high jacket foundation is more than 50m.

[0023] The beneficial effects of the present invention are:

[0024] 1. A segmented assembly and splicing high jacket foundation structure is proposed, which solves the problem of difficult offshore overall hoisting construction of high jacket (over 50m) foundation structure. The shore construction, split transportation and precise docking installation technology are adopted to solve the problems of short offshore construction window, hoisting difficulties, high installation and transportation costs, and greatly save construction and installation time and costs. The segmented hoisting technology eliminates the need for large-scale hoisting equipment to enter the site, greatly reducing the risk and cost of offshore hoisting construction of high jacket foundation, and providing an economically feasible foundation type for my country's offshore wind farms to move into the deep sea.

[0025] 2. The foundation type adopts a segmented and assembled high jacket structure, which can be divided into N sections according to the water depth for onshore segment construction and offshore segment lifting. It is suitable for wider and deeper waters, and greatly shortens the construction and construction time, thereby improving the construction efficiency of offshore wind farms.

[0026] 3. Use a towing rope to guide and tow during the docking process, and use economically feasible means to achieve precise underwater docking of the segmented jacket structure.

[0027] 4. The docking device can ensure that the segmented jacket structure is automatically tightened after the docking is completed, ensuring that the segmented jacket foundation structure is reliably connected, reasonably stressed, and can be compressed and pulled. It can withstand both vertical and horizontal loads of the superstructure and eccentric loads.

[0028] 5. The split splicing installation technology eliminates the need for on-site grouting and maintenance, enabling rapid installation of high-jacket structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a high jacket foundation of the present invention;

[0030] Figure 2 for Figure 1 A schematic elevation view of the docking structure of the segmented jackets before docking in the illustrated embodiment;

[0031] Figure 3 for Figure 1 A schematic elevation view of the docking structure of the segmented jackets after docking is completed in the embodiment shown;

[0032] Figure 4 This is the detailed drawing of the rigid support before docking;

[0033] Figure 5 Complete the rigid support details for docking;

[0034] Figure 6 This is a schematic diagram of the hoisting of the lower jacket structure;

[0035] Figure 7This is a schematic diagram of the hoisting and docking of the upper jacket structure;

[0036] Figure 8 Complete the overall structural diagram for the high jacket foundation hoisting; DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0038] As shown in the figure, the present invention provides a segmented splicable jacket structure with automatic docking and fastening functions. It is a segmented splicable assembled structure, consisting of an upper jacket structure 1 and a lower jacket structure 4. The segments are connected and fixed by a guide traction device 2 and a guide docking structure 3 to ensure accurate and reliable docking of the jacket structure.

[0039] Each main leg of the upper jacket structure 1 and the lower jacket structure 4 is connected and fastened via a guide traction device 2 and a guide docking structure 3 .

[0040] Specifically, if Figure 2 and Figure 3 As shown, the guide and traction device 2 includes an upper guide ring 8 and a lower guide ring 13 respectively welded to the lower end of the main leg 5 of the upper jacket structure and the upper end of the main leg 6 of the lower jacket structure, the upper part of the upper guide ring 8 is welded to the upper fixed pulley 7, and the lower part of the lower guide ring 13 is welded to the lower fixed pulley 14. There is a cylindrical opening 9 on the upper guide ring 8 for the traction rope 28 to pass through, and there is a cylindrical opening 15 on the lower guide ring 13 for the traction rope 28 to pass through. The cylindrical openings 9 and 15 are consistent in size and have the same inclination angle. When the upper and lower jacket structures are docked, the cylindrical openings 9 and 15 can be aligned to ensure that the upper and lower jacket structures are accurately docked; when positioning and docking, the guide traction rope 28 is temporarily used for traction and lifting, and the guide traction rope 28 can cooperate with the fixed pulleys 7 and 14.

[0041] The guide docking structure 3 includes a semi-ellipsoidal docking structure 10 at the bottom of the main leg 5 of the upper jacket structure and a docking structure at the top of the main leg 6 of the lower jacket structure; the bottom end of the semi-ellipsoidal docking structure 10 at the bottom of the main leg 5 of the upper jacket structure is a cylindrical structure 11 with a transverse through hole 12, and the end of the cylindrical structure 11 has an arc-shaped chamfer to avoid rigid collision during docking; the docking structure at the top of the main leg 6 of the lower jacket structure includes a semi-ellipsoidal tray 16 with a certain thickness, a rigid support structure with a built-in fastening mechanism, a crossbeam 25, a stiffening plate 26 and other structures, wherein the crossbeam 25 is a porous structure that can drain water.

[0042] like Figure 4 As shown, the rigid support structure of the built-in fastening mechanism includes a rigid support column 17, a first compressible spring 19, a second compressible spring 22, a rigid cylindrical locking pin 20 connected to the first compressible spring 19, and a cylindrical support block 24 connected to the second compressible spring 22. The rigid support column 17 is provided with a central large-diameter positioning hole 21, a small-diameter locking hole 23 perpendicular to the large-diameter positioning hole 21, and a variable-section locking hole 18. The second compressible spring 22 and cylindrical support block 24 are disposed in the central large-diameter positioning hole 21. The cylindrical support block 24 can move up and down in the central large-diameter positioning hole 21 and is supported on the second compressible spring 22. Among them, the variable-section lock hole 18 and the small-diameter lock hole 23 are on the same straight line and are respectively located on both radial sides of the central large-diameter positioning hole 21. The first compressible spring is arranged in the variable-section lock hole 18, and the rigid cylindrical lock pin 20 can move left and right in the variable-section lock hole 18 and the small-diameter lock hole 23. The diameter of the transverse through hole 12 also matches the rigid cylindrical lock pin 20, so that it can pass through the transverse through hole 12. The diameter of the central large-diameter positioning hole 21 matches the cylindrical structure 11, so that the cylindrical structure 11 can be inserted into the central large-diameter positioning hole 21, compressing the cylindrical support block 24 and the second compressible spring 22.

[0043] The crossbeam 25 is welded to the inside of the main leg 6, the rigid support structure is welded to the crossbeam 25, and in this embodiment, the rigid support column 17 is welded to the crossbeam 25. The semi-ellipsoidal tray 16 is welded to the rigid support structure and the top of the main leg of the lower jacket structure. In this embodiment, the semi-ellipsoidal tray 16 is welded to the rigid support structure and the top of the main leg of the lower jacket structure.

[0044] Before the upper jacket structure 1 and the lower jacket structure 4 are docked, one end of the rigid cylindrical locking pin 20 in the rigid support structure of the built-in fastening device is connected to the compressible spring 19, and the other end is pressed on the cylindrical support block 24; when the segmented jacket foundation is docked, one end of the rigid cylindrical locking pin 20 is connected to the compressible spring 19, and the other end passes through the transverse through hole 12 on the cylindrical structure 11 with a circular arc chamfer at the end of the upper jacket main leg 5 and is inserted into the small-diameter locking hole 23, thereby realizing automatic fastening of the segmented jacket structure after docking, ensuring reliable connection and reasonable force.

[0045] Combine Figures 1 to 8 As shown, based on the segmented splicable jacket structure with automatic docking and fastening functions of the present invention, the splicing and fastening construction method for the splicable jacket foundation provided by the present invention includes the following steps:

[0046] S1) The upper and lower jacket structures of the high jacket foundation have been constructed in sections onshore and transported to the construction site in sections.

[0047] S2) Before lifting, pass the traction rope 28-1-2 from bottom to top through the opening 15 of the lower guide ring 13 welded to the top of the main leg 6 of the lower jacket structure 4. One end of the rope is fixed along the fixed pulley 14 to the reel 27-2 and 27-4 on the construction vessel, and the other end is fixed to the reel 27-1 and 27-3 on the construction vessel.

[0048] S3) The lifting equipment lifts the lower jacket structure 4 and, when lowering the lower jacket structure 4, accurately lowers the lower jacket structure 4 to the designated installation position by pulling the traction rope 28, thereby completing the installation of the lower jacket structure 4;

[0049] S4) Disconnect the traction rope 28 from 27-2 and 27-4. Pass the upper end of the traction rope 28, which has passed through the lower guide ring 13 of the lower jacket structure 4 and is fixed to the construction vessel, from bottom to top through the opening 9 of the upper guide ring 8 welded to the main leg 5 of the upper jacket 1. The upper end is then secured along the fixed pulley 7 to the reel pulleys 27-1 and 27-3 located on the construction vessel.

[0050] S5) The lifting equipment lifts the upper jacket structure 1 and, when lowering the upper jacket structure 1, pulls the traction rope 28 to achieve precise docking of the upper jacket structure 1 with the lower jacket structure 4;

[0051] S6) After the cylindrical structure 11 of the semi-ellipsoidal docking structure 10 of the upper jacket structure 1 enters the semi-ellipsoidal tray 16 of the lower jacket structure 4, the upper jacket structure 1 is slowly lowered and the traction rope 28 is tightened to ensure that the docking portions of the upper and lower jacket structures are in the same docking plane;

[0052] S7) After the cylindrical structure 11 of the semi-ellipsoidal docking structure 10 of the upper jacket structure 1 enters the central large-diameter positioning hole 21 in the rigid support column 17 of the lower jacket structure 4, the upper jacket structure 1 continues to be slowly lowered. At this time, the cylindrical structure 11 of the semi-ellipsoidal docking structure 10 of the upper jacket structure 1 will squeeze the cylindrical support block 24 connected to the second compressible spring 22 in the rigid support column 17 of the lower jacket structure 4. The second compressible spring 22 is compressed, and the cylindrical support block 24 slowly moves downward along with the cylindrical structure 11 of the semi-ellipsoidal docking structure 10 of the upper jacket structure 1;

[0053] S8) When the semi-ellipsoidal docking structure 10 of the upper jacket docking structure contacts the semi-ellipsoidal tray 16 of the lower jacket docking structure, the rigid cylindrical locking pin 20 connected to the first compressible spring 19 in the variable-section locking hole 18 in the rigid support 17 passes through the transverse through-hole 12 of the cylindrical structure 11 at the end of the semi-ellipsoidal docking structure 10 of the upper jacket docking structure and extends into the small-diameter locking hole 23, thereby achieving a secure connection of the segmented jackets. The structure can withstand vertical and horizontal loads of the wind turbine structure or offshore booster station structure, as well as small eccentric loads.

[0054] S9) releasing the traction rope 28. Thus, the segmented splicable jacket foundation is installed.

[0055] The above embodiment is only a preferred technical solution of the present invention. Those skilled in the art should understand that the technical solutions or parameters in the embodiment can be modified or replaced without departing from the principle and essence of the present invention, and all should be covered by the protection scope of the present invention.

Claims

1. A segmented, splicable jacket structure, characterized in that: The jacket is divided into upper and lower jacket structures, which are connected and fixed by a guide traction device and a guide docking structure to ensure accurate, reliable docking and firm connection of the jacket structures. The guide and traction device retains an upper guide ring and a lower guide ring welded to the lower end of the main leg of the upper jacket structure and the upper end of the main leg of the lower jacket structure, respectively. The upper guide ring is welded to the upper part of the upper fixed pulley, and the lower guide ring is welded to the lower part of the lower fixed pulley. Both the upper guide ring and the lower guide ring have openings for the traction rope to pass through. When the upper and lower jacket structures are docked, the openings on the upper guide ring and the lower guide ring can be aligned to ensure the precise docking of the upper and lower jacket structures. The guide docking structure includes a semi-ellipsoidal docking structure at the bottom of the main leg of the upper jacket structure and a docking structure at the top of the main leg of the lower jacket structure; the bottom center of the semi-ellipsoidal docking structure at the bottom of the main leg of the upper jacket structure is a cylindrical structure with a transverse through hole; the docking structure at the top of the main leg of the lower jacket structure includes a semi-ellipsoidal tray, a rigid support structure with a built-in fastening mechanism, and a crossbeam, and the fastening mechanism cooperates with the cylindrical structure with the transverse through hole; the crossbeam is welded to the inside of the main leg of the lower jacket structure, the rigid support structure is welded to the crossbeam, and the semi-ellipsoidal tray is welded to the rigid support structure and the top of the main leg of the lower jacket structure; The rigid support structure of the built-in fastening mechanism includes a rigid pillar, a first compressible spring and a second compressible spring, a rigid cylindrical locking pin connected to the first compressible spring, and a cylindrical support block connected to the second compressible spring; the rigid pillar is provided with a central large diameter positioning hole and a small diameter locking hole and a variable cross-section locking hole perpendicular to the large diameter positioning hole; the variable cross-section locking hole and the small diameter locking hole are on the same straight line and are respectively located on both sides of the radial direction of the central large diameter positioning hole, and the first compressible spring is arranged in the variable cross-section locking hole; the second compressible spring and the cylindrical block are arranged in the central large diameter positioning hole, and the cylindrical block can move up and down in the central large diameter positioning hole, and the cylindrical block is supported on the second compressible spring; before the cylindrical structure is not inserted into the central large diameter positioning hole, the cylindrical block is blocked between the small diameter locking hole and the variable cross-section locking hole, the rigid cylindrical locking pin is located in the variable cross-section locking hole, the diameter of the transverse through hole also matches the rigid cylindrical locking pin, so that it can pass through the transverse through hole, and the diameter of the central large diameter positioning hole matches the cylindrical structure, so that the cylindrical structure can be inserted into the central large diameter positioning hole.

2. A method for splicing and fastening a splicable jacket foundation, characterized by: The high jacket foundation is divided into two sections, the upper and lower sections, and then the upper and lower sections are precisely docked and firmly connected by the guide traction device and the guide docking structure as claimed in claim 1 provided on the main legs of the upper and lower jacket structures, including the following steps: 1) The upper and lower jacket structures of the high jacket foundation have been constructed in sections onshore and transported to the construction site in sections offshore; 2) Before lifting, pass the traction rope from bottom to top through the guide ring welded to the top of the main leg of the lower jacket structure, and fix both ends to the reel located on the construction vessel; 3) The lifting equipment lifts the lower jacket structure and, when lowering the lower jacket structure, precisely lowers the lower jacket structure to the designated installation position by pulling the traction rope, completing the installation of the lower jacket structure; 4) Pass the upper end of the traction rope, which has passed through the lower jacket guide ring and is fixed to the construction vessel, from bottom to top through the guide ring welded to the lower end of the upper jacket structure main leg, and fix it to the reel located on the construction vessel; 5) The hoisting equipment lifts the upper jacket structure and pulls the traction rope to achieve precise docking of the upper and lower jacket structures when lowering the upper jacket structure; 6) After the end of the semi-ellipsoidal docking structure of the upper jacket structure enters the semi-ellipsoidal tray of the lower jacket structure, slowly lower the upper jacket structure and tighten the traction rope to ensure that the docking parts of the upper and lower jacket structures are in the same docking plane; 7) After the end of the upper jacket structure docking structure enters the rigid support column of the lower jacket structure docking structure, the upper jacket structure continues to be slowly lowered. At this time, the cylindrical structure end of the upper jacket structure docking structure will squeeze the cylindrical block connected to the second compressible spring in the rigid support column of the lower jacket structure. The second compressible spring is compressed, and the cylindrical block slowly moves downward along with the cylindrical structure end of the upper jacket structure docking structure. 8) When the semi-ellipsoidal structure of the upper jacket docking structure contacts the semi-ellipsoidal tray of the lower jacket docking structure, the rigid cylindrical locking pin connected to the first compressible spring in the variable-section locking hole of the rigid support strut just passes through the transverse through-hole of the cylindrical structure at the semi-ellipsoidal end of the upper jacket docking structure and extends into the small-diameter locking hole, thereby achieving a secure connection of the segmented jackets. This can withstand the vertical and horizontal loads of the wind turbine structure or offshore booster station structure, as well as small eccentric loads. 9) Release the traction rope. At this point, the segmented spliced ​​jacket foundation is installed.

3. A method for splicing and fastening a splicable jacket foundation according to claim 2, characterized in that: The height of the high jacket foundation is above 50m.

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