A floating platform for offshore wind turbines with multiple turbines and its installation method

Abstract

This invention discloses a floating platform for multiple offshore wind turbines, comprising a main hull, a truss structure, multiple vertical tension cables, multiple guide tubes, and a lower frame. The main hull accommodates multiple cylindrical foundation turbine structures and provides lateral constraints for these structures, assisting in their overall floating transport at sea. The truss structure, located on top of the main hull, provides lateral support for the multiple cylindrical foundation turbine structures. Each cylindrical foundation turbine structure includes a cylindrical foundation, an arc-shaped transition section, and a tower. The two ends of the vertical tension cables are connected to the top of the cylindrical foundation and the top of the truss structure, respectively. The guide tubes provide vertical guidance during the installation of the cylindrical foundation turbine structures. This invention enables the simultaneous transport of multiple offshore wind turbine cylindrical foundation turbine structures, effectively reducing installation costs during large-scale offshore wind power construction and meeting the needs of large-scale offshore wind power development.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power technology, and in particular to an offshore wind turbine multi-unit floating platform and its installation method. Background Technology

[0002] As a renewable and clean energy source, wind energy is playing an increasingly important role in gradually reducing dependence on oil resources.

[0003] To further improve the cost competitiveness of offshore wind power, it is necessary to reduce the main costs throughout the construction lifecycle of offshore wind power projects. Research shows that due to factors such as a shortage of offshore wind power installation equipment, long installation cycles, short operational windows, and low installation efficiency, installation costs account for a significant proportion of the total cost of offshore wind power development.

[0004] Currently, in order to carry out large-scale offshore wind power construction, it is required to be able to transport multiple offshore wind turbine cylindrical foundations at the same time, so as to reduce the installation cost during large-scale offshore wind power construction and meet the needs of large-scale offshore wind power development.

[0005] However, there is currently no technology that can meet the above technical requirements. Summary of the Invention

[0006] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a floating platform for offshore wind power with multiple turbines and its installation method.

[0007] To this end, the present invention provides a floating platform for multiple offshore wind turbines, which includes a main hull, a truss structure, multiple vertical tension cables, multiple guide tubes and a lower frame;

[0008] The main hull is used to accommodate multiple cylindrical foundation structures and provide lateral constraints for the cylindrical foundation structures, thereby assisting in the overall floating and transport of the cylindrical foundation structures at sea.

[0009] The truss structure, located at the top of the main hull, provides lateral support for multiple cylindrical foundation structures.

[0010] Each cylindrical foundation structure consists of a cylindrical foundation, an arc-shaped transition section, and a tower.

[0011] The cylindrical foundation is a cylindrical body with an open bottom;

[0012] The cylindrical foundation has an arc-shaped transition section vertically positioned at the top center.

[0013] The tower is vertically installed at the top of the arc-shaped transition section;

[0014] For each cylindrical foundation structure, the lower end of a vertical tension cable is fixedly connected to the top of the cylindrical foundation. The vertical tension cable is vertically distributed and its upper end is fixedly connected to the top of the truss structure. The vertical tension cable is used to provide vertical upward tension for the cylindrical foundation structure.

[0015] The left and right ends of the main hull are respectively provided with the same number of U-shaped grooves;

[0016] Each U-shaped groove is used to accommodate a cylindrical base structure of the entire machine.

[0017] The lower frame is provided at the bottom of the main hull;

[0018] The lower frame is used for detachably mounting the cylindrical foundation structure of the whole machine;

[0019] Multiple guide tubes are vertically installed through the lower frame;

[0020] Each guide tube is slidably connected to the main hull in the vertical direction, and is used to provide vertical guidance when installing the cylindrical foundation structure in the main hull.

[0021] Preferably, both the lower frame and the truss structure are hollow frame structures;

[0022] The tower's shape is that of a frustum of a cone;

[0023] A fan is installed at the top of the tower.

[0024] The fan has multiple blades.

[0025] Preferably, two U-shaped grooves are symmetrically provided at each of the left and right ends of the main hull;

[0026] Each U-shaped groove is used to accommodate a cylindrical base structure of the entire machine.

[0027] At the position corresponding to each U-shaped groove, the lower frame is provided with a cylindrical base with vertical vertical penetration into the cavity;

[0028] A cylindrical foundation is placed inside a cavity to accommodate the entire cylindrical foundation structure.

[0029] Preferably, the diameter of the arc segment of the U-shaped groove on the main hull is larger than the diameter of the cylindrical foundation of the entire cylindrical foundation structure;

[0030] The top height of the truss structure is equal to half the overall height of the cylindrical foundation structure.

[0031] The vertical upward tension provided by each vertical tension cable to a corresponding cylindrical foundation structure is equal to the difference between the weight and buoyancy of the cylindrical foundation structure.

[0032] Preferably, the top of the truss structure is connected to the tower in each cylindrical foundation structure via a clamping device;

[0033] Clamping equipment is used for lateral support of the tower;

[0034] Each clamping device includes an arc-shaped clamping ring, an arc-shaped snap ring, a first pin, and a second pin;

[0035] The tower is located inside the clamping ring and the snap ring;

[0036] Rubber pads are provided between the inner sides of the clamping ring and the outer side of the tower.

[0037] Preferably, the two ends of the clamping ring are a fixed end and a free end, respectively;

[0038] The fixed end of the clamping ring is fixedly connected to the snap ring by the first pin.

[0039] The free end of the clamping ring extends into the buckle ring, with horizontally distributed, arc-shaped clamping rings inserted into the grooves.

[0040] The free end of the clamping ring is fixedly connected to the snap ring by a second pin.

[0041] The snap rings are fixedly connected to the truss structure.

[0042] Preferably, the main hull is provided with a vertical through hole for each guide tube at a position corresponding to each guide tube;

[0043] Inside the main hull, around each vertical through-hole of the guide tube, there is an in-cabin sliding assembly.

[0044] The internal sliding assembly includes rolling bearings, an outer shell, and internal fixed supports;

[0045] The outer hull is located within the main hull;

[0046] The sliding bearing is located inside the housing;

[0047] The guide tube passes vertically through the inner ring of the sliding bearing;

[0048] The fixed supports inside the cabin are located in the main hull, and the outer shell is located in its inner cavity.

[0049] Preferably, the lower frame is used for vertical up-and-down sliding along the guide tube, specifically by a sliding rail and a sliding steel plate fixed to the guide tube;

[0050] The sliding track is a vertically distributed groove structure in the guide tube, and is radially distributed along the length of the guide tube;

[0051] The front end of the sliding steel plate has a wedge-shaped block that matches the sliding track, and the rear end is a flat steel plate structure.

[0052] The wedge-shaped block slides into the groove structure of the sliding track;

[0053] The lower frame is fixedly connected to the flat steel plate at the tail end of the sliding steel plate.

[0054] Preferably, the bottom edges of the cylindrical foundation of each cylindrical foundation of the whole machine structure are fixedly connected to the bottom of the lower frame by four horizontal limiting cables.

[0055] The projection of each horizontal limiting cable onto the horizontal plane is distributed radially along the cylindrical foundation of the entire cylindrical foundation structure.

[0056] The four horizontal limiting cables are symmetrically distributed front and back;

[0057] The angle between the projections of the two front horizontal limiting cables onto the horizontal plane is equal to the angle between the projections of the two rear horizontal limiting cables onto the horizontal plane.

[0058] The horizontal limiting cables are distributed at an angle from the bottom of the cylindrical foundation to the bottom of the lower frame, and the height gradually decreases.

[0059] In addition, the present invention also provides an installation method for a multi-turbine floating platform for offshore wind power as described above, which includes a pre-floating loading operation stage and an installation operation stage at the installation site.

[0060] The pre-ship loading operation phase includes the following steps:

[0061] Step S101: Undocking the cylindrical foundation: For any cylindrical foundation to be installed, the cylindrical foundation is prefabricated in the dock. By opening the gate to release water, the cylindrical foundation has the ability to float on its own in the dock. Then, the cylindrical foundation is pulled by a winch to complete the undocking operation.

[0062] Step S102: Loading the cylindrical foundation: The main hull is pre-anchored and positioned at the dock outlet. After the cylindrical foundation is unloaded, the cylindrical foundation is inserted into the U-shaped groove of the main hull using the traction equipment on the main hull. Then, the bottom of the cylindrical foundation is tied to the bottom of the lower frame using horizontal limiting cables, and the pre-set lifting points at the top of the cylindrical foundation are tied to the top frame of the truss structure on the main hull using vertical tension cables.

[0063] The main hull is provided with multiple U-shaped grooves;

[0064] Step S103: Lifting the tower and wind turbine: After the cylindrical foundation is inserted into the main hull and secured, the tower is placed in the vertically penetrating slot located directly above the U-shaped groove in the truss structure.

[0065] The tower is hoisted in and then fixedly connected to the top of the cylindrical foundation. Finally, a bladed fan is installed on the top of the tower.

[0066] Step S104: Repeat steps S101 to S103 until all U-shaped grooves of the main hull are filled with cylindrical foundations and the towers and wind turbines are installed on all cylindrical foundations, thereby completing the ship loading operation of the entire cylindrical foundation structure on the main hull.

[0067] The installation operation phase at the installation site includes the following steps:

[0068] Step S201, Lowering the guide pipes: When the main hull is floated to the installation site of a cylindrical foundation structure, after anchoring and positioning, all the guide pipes are lowered to the seabed.

[0069] Step S202, Lowering the lower frame: Before lowering the lower frame, the horizontal limiting cable at the bottom of the cylindrical foundation of the lower frame and the cylindrical foundation of the whole machine structure should be slowly tensioned. Then, the cylindrical foundation should be slowly lowered. During this process, the cable release operation should be carried out in conjunction with the longitudinal tensioning cable so that the bottom of the cylindrical foundation and the bottom of the lower frame have the same elevation, and then they should be lowered at the same time.

[0070] Step S203, release the cables upon bottoming out: When the cylindrical foundation and the lower frame touch the seabed together, release the horizontal limit cables and the longitudinal tension cables;

[0071] Step S204, Foundation Placement: By pumping water into the internal cavity of the cylindrical foundation of the whole machine structure, a negative pressure environment is created, thereby vertically inserting the cylindrical foundation into the seabed and completing the installation operation of the cylindrical foundation whole machine structure.

[0072] Step S205: Repeat steps S201 to S204 to complete the installation of all cylindrical foundation structures on the main hull.

[0073] As can be seen from the technical solutions provided by the present invention above, compared with the prior art, the present invention provides a floating platform for multiple offshore wind turbines and its installation method. Its design is scientific. Compared with the prior art, the present invention can transport multiple offshore wind turbine cylindrical foundation structures at the same time, which helps to realize the large-scale floating and rapid installation of multiple offshore wind turbine cylindrical foundation structures. It can effectively reduce the installation cost during the large-scale construction of offshore wind power, meet the needs of the large-scale development of offshore wind power, and has significant practical significance.

[0074] The present invention provides a specially designed installation method for a multi-turbine floating platform for offshore wind power. By making reasonable use of the inherent buoyancy and stability characteristics of the cylindrical foundation, and by using a cable system, a guide system, and a subframe system, it can cleverly avoid the use of large-scale lifting equipment. While meeting the requirements for large-scale floating installation, it shortens the construction period of the cylindrical foundation and its entire turbine structure at sea, and improves the stability and safety of the offshore wind power cylindrical foundation and its entire turbine structure during floating installation at sea, providing a new direction for the large-scale and efficient construction of offshore wind power.

[0075] After testing, the technical solution of the present invention, under the premise of economic feasibility and construction convenience, can simultaneously float multiple cylindrical foundation structures. By using auxiliary cables for limiting, the use of large lifting equipment is reduced, thereby achieving cost reduction in the installation of cylindrical foundations and their overall structures. Attached Figure Description

[0076] Figure 1 This is an isometric schematic diagram of a multi-turbine floating platform for offshore wind power provided by the present invention;

[0077] Figure 2 This is a side view schematic diagram of a multi-turbine floating platform for offshore wind power provided by the present invention;

[0078] Figure 3 This is a bottom view schematic diagram of a multi-turbine floating platform for offshore wind power provided by the present invention;

[0079] Figure 4 This is a schematic diagram of the cylindrical foundation being launched from the dock during the floating operation stage of an installation method for a multi-turbine floating platform for offshore wind power provided by the present invention.

[0080] Figure 5 This is a schematic diagram of the loading of the first cylindrical foundation during the pre-floating loading operation stage in the installation method of a multi-turbine floating platform for offshore wind power provided by the present invention.

[0081] Figure 6 This is a schematic diagram showing the completion of the loading of the first cylindrical foundation unit structure during the pre-floating ship loading operation stage in the installation method of a multi-unit floating platform for offshore wind power provided by the present invention.

[0082] Figure 7This is a schematic diagram showing the completion of the loading of the nth cylindrical foundation unit structure during the pre-floating ship loading operation stage in the installation method of a multi-unit floating platform for offshore wind power provided by the present invention (2≤n≤4).

[0083] Figure 8 This is a schematic diagram of the installation operation phase of the installation of a multi-turbine floating platform for offshore wind power provided by the present invention, showing the lowering of the guide pipe at the installation site.

[0084] Figure 9 This is a schematic diagram of the lower frame being lowered during the installation operation phase at the installation site in an installation method for a multi-turbine floating platform for offshore wind power provided by the present invention.

[0085] Figure 10 This is a schematic diagram illustrating the lowering of the cylindrical foundation structure to the seabed during the installation operation phase of an offshore wind power multi-turbine floating platform installation method provided by the present invention.

[0086] Figure 11 This is a schematic diagram of the completion of the sinking of the cylindrical foundation and the entire structure during the installation operation stage of an offshore wind power multi-turbine floating platform installation method provided by the present invention.

[0087] Figure 12 This is a schematic diagram of the main hull of a multi-turbine floating platform for offshore wind power provided by the present invention;

[0088] Figure 13 This is a schematic diagram of the sliding and limiting components related to the guide tube in a multi-turbine floating platform for offshore wind power provided by the present invention;

[0089] Figure 14 This is a schematic diagram of the sliding of the lower frame in a multi-turbine floating platform for offshore wind power provided by the present invention;

[0090] Figure 15 This is a schematic diagram of the lower frame perimeter structure of a multi-turbine floating platform for offshore wind power provided by the present invention;

[0091] Figure 16 This is a schematic diagram of a clamping device installed on the truss structure of a multi-turbine floating platform for offshore wind power provided by the present invention;

[0092] Figure 17 This is a three-dimensional structural diagram of the truss structure of a multi-turbine floating platform for offshore wind power provided by the present invention;

[0093] 1. Cylindrical foundation overall structure; 11. Cylindrical foundation; 12. Arc-shaped transition section; 13. Tower; 14. Fan;

[0094] 2. Main hull; 21. U-shaped groove; 22. In-cabin sliding assembly; 221. Rolling bearing; 222. Outer shell; 223. In-cabin fixed support; 23. First in-cabin pin.

[0095] 3. Truss structure; 31. Clamping device; 311. Clamping ring; 312. Snap ring; 313. First pin; 314. Second pin; 32. First horizontal support steel pipe; 33. First vertical support steel pipe; 34. First longitudinal support steel pipe; 35. Diagonal support steel pipe.

[0096] 4. Vertical tension cable;

[0097] 5. Guide tube; 51. Second compartment internal pin; 52. Sliding rail; 53. Sliding steel plate;

[0098] 6. Lower frame, 61. Second horizontal support steel pipe, 62. Second vertical support steel pipe, 63. Second longitudinal support steel pipe;

[0099] 7. Horizontal limit cable; 8. Dry dock;

[0100] 100. Seabed surface. Detailed Implementation

[0101] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0102] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0103] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0104] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0105] See Figures 1 to 17 The present invention provides a floating platform for multiple offshore wind turbines, which is a floating platform suitable for multiple cylindrical foundations. Specifically, it includes a main hull 2, a truss structure 3, multiple vertical tension cables 4, multiple guide pipes 5, and a lower frame 6.

[0106] The main hull 2 ​​is used to accommodate multiple cylindrical foundation structures 1. When it is towed by external tugboats, it provides lateral constraints to the cylindrical foundation structures 1, thereby assisting the cylindrical foundation structures 1 in floating at sea as a whole.

[0107] Truss structure 3, located on top of the main hull 2, is used to provide lateral support for multiple cylindrical foundation structures 1;

[0108] Each cylindrical foundation structure 1 includes a cylindrical foundation 11, an arc transition section 12, and a tower 13;

[0109] The cylindrical foundation 11 is a cylindrical tube with an open bottom (specifically, the bottom is not sealed and is completely open);

[0110] The arc-shaped transition section 12 is vertically provided at the top center of the cylindrical foundation 11;

[0111] The tower 13 is vertically disposed at the top of the arc-shaped transition section 12;

[0112] For each cylindrical foundation structure 1, the top of the cylindrical foundation 11 is fixedly connected to the lower end of a vertical tension cable 4. The vertical tension cable 4 is vertically distributed and its upper end is fixedly connected to the top of the truss structure 3. The vertical tension cable 4 is used to provide a vertically upward (i.e., vertically upward) tension for the cylindrical foundation structure 1.

[0113] The left and right ends of the main hull 2 ​​are respectively provided with the same number of (e.g., two) U-shaped grooves 21;

[0114] Each U-shaped groove 21 is used to accommodate a cylindrical base structure 1.

[0115] The lower frame 6 is provided at the bottom of the main hull 2;

[0116] The lower frame 6 is used for detachably mounting the cylindrical foundation structure 1.

[0117] Multiple guide tubes 5 are vertically inserted through the lower frame 6;

[0118] Each guide tube 5 is slidably connected to the main hull 2 ​​in the vertical direction, and is used to play a guiding role in the vertical direction when installing the cylindrical foundation structure 1 in the main hull 2.

[0119] It should be noted that the lower frame 6 can slide and be limited vertically along the guide tube 5, and provides horizontal limitation when it is used to install the cylindrical foundation structure 1.

[0120] It should be noted that the guide tube 5 can slide vertically up and down through the main hull 2. It is used to provide vertical guidance when installing the cylindrical foundation structure 1 in the main hull 2. In addition, it can also be used for positioning the main hull 2.

[0121] In this invention, specifically, both the lower frame 6 and the truss structure 3 are hollow frame structures.

[0122] In this invention, specifically, the tower 13 is shaped like a frustum conical.

[0123] In this invention, specifically, a fan 14 is provided at the top of the tower 13;

[0124] The fan 14 has multiple blades.

[0125] In this invention, for specific implementation, see [link to relevant documentation]. Figure 12 Two U-shaped grooves 21 are symmetrically provided at the left and right ends of the main hull 2;

[0126] Each U-shaped groove 21 is used to accommodate a cylindrical basic machine structure 1;

[0127] The lower frame 6 has a cylindrical base that runs vertically through the cavity at the position corresponding to each U-shaped groove 21;

[0128] A cylindrical foundation is placed into the cavity to accommodate the cylindrical foundation 11 of the whole machine structure 1.

[0129] It should be noted that the cross-sectional shape and size of the cylindrical foundation placed in the cavity are larger than the cross-sectional shape and size of the cylindrical foundation 11.

[0130] It should be noted that the lower frame 6 is a hollow frame formed by splicing together multiple high-strength, corrosion-resistant steel pipe structures, including multiple second horizontal support steel pipes 61, multiple second vertical support steel pipes 62 and multiple second longitudinal support steel pipes 63, which are spliced ​​together sequentially.

[0131] In practice, the diameter of the arc segment of the U-shaped groove 21 on the main hull 2 ​​is larger than the diameter of the cylindrical foundation 11 of the cylindrical foundation structure 1.

[0132] In this invention, specifically, the highest position of the lateral support of the truss structure 3 is located in the middle section of the cylindrical foundation structure 1, that is, the top height of the truss structure 3 is equal to half the overall height of the cylindrical foundation structure 1.

[0133] In this invention, specifically, the lateral support of the truss structure 3 to the cylindrical foundation structure 1 can be achieved by the clamping device 31. The lateral support of the four cylindrical foundation structures 1 can be achieved by the four clamping devices 31.

[0134] In this invention, specifically, the top of the truss structure 3 is connected to the tower 13 in each cylindrical foundation structure 1 by a clamping device 31.

[0135] The clamping device 31 is used to provide lateral support for the tower 13.

[0136] In this invention, each clamping device 31 is a circular structure, which includes an arc-shaped clamping ring 311, an arc-shaped buckle ring 312, a first pin 313 and a second pin 314.

[0137] The tower 13 is located inside the clamping ring 311 and the snap ring 312;

[0138] Rubber pads are provided between the inner sides of the clamping ring 311 and the snap ring 312 and the outer side of the tower 13.

[0139] It should be noted that rubber pads are provided on the contact surfaces between the clamping ring 311, the snap ring 312 and the tower 13 to increase the cushioning effect and avoid damage to the tower 13.

[0140] In this invention, specifically, the clamping ring 311 is arc-shaped, with a fixed end and a free end at its two ends;

[0141] The fixed end of the clamping ring 311 is fixedly connected to the snap ring 312 by the first pin 313;

[0142] The free end of the clamping ring 311 extends into the snap ring 312 (the snap ring 312 has horizontally distributed, arc-shaped clamping ring insertion grooves reserved inside), so that by adjusting the diameter of the circular space formed by the clamping ring 311 and the snap ring 312, the diameter matches the diameter of the tower 13, thereby achieving the clamping function.

[0143] The free end of the clamping ring 311 is fixedly connected to the snap ring 312 by the second pin 314;

[0144] The snap ring 312 is fixedly connected to the truss structure 3 (specifically, the top of the truss structure 3).

[0145] It should be noted that the clamping device 31 is installed at the highest position of the truss structure 3.

[0146] In this invention, specifically, the truss structure 3 is provided with multiple vertically penetrating tower placement slots;

[0147] Each tower placement slot is used to vertically place a tower 13 from top to bottom;

[0148] Each tower placement slot is positioned vertically and vertically corresponding to a U-shaped groove 21 on the main hull 2.

[0149] It should be noted that the truss structure 3 is a hollow frame formed by splicing multiple high-strength steel pipes, including the first horizontal support steel pipe 32, the first vertical support steel pipe 33, the first longitudinal support steel pipe 34, and the diagonal support steel pipe 35, which are spliced ​​together in sequence.

[0150] In this invention, specifically, the vertical tension cable 4 should be able to provide the difference between the gravity and buoyancy of the cylindrical foundation structure 1. That is, the vertical upward (i.e., vertically upward) tension provided by each vertical tension cable 4 for a corresponding cylindrical foundation structure 1 is equal to the difference between the gravity and buoyancy of a cylindrical foundation structure 1.

[0151] In this invention, each guide tube 5 is slidably connected to the main hull 2 ​​in the vertical direction (i.e., sliding up and down in the vertical direction), which is specifically achieved through the in-cabin sliding assembly 22 of the main hull 2.

[0152] In practice, the main hull 2 ​​is provided with a vertical through hole for each guide tube 5 at the position corresponding to each guide tube 5;

[0153] Inside the main hull 2, around each vertical through hole of the guide tube, there is an in-cabin sliding assembly 22.

[0154] In specific implementation, the in-cabin sliding assembly 22 is a cylindrical structure, which includes a rolling bearing 221, an outer shell 222 and an in-cabin fixed support 223;

[0155] The outer hull 222 is located within the main hull 2;

[0156] The sliding bearing 221 is located inside the housing 222;

[0157] The guide tube 5 passes vertically through the inner ring of the sliding bearing 221.

[0158] The fixed support 223 inside the cabin is located in the main hull 2, and the outer shell 222 is located in its inner cavity.

[0159] It should be noted that, under the constraints of the outer casing 222 and the guide tube 5, the sliding bearing 221 can only rotate radially and cannot be displaced in any direction; the inner surface of the outer casing 222 is an absolutely smooth surface to reduce rolling friction.

[0160] In this invention, specifically, when the designated position is reached, the guide tube 5 can be locked to the first compartment pin 23 of the main hull 2 ​​by using the second compartment pin 51 to maintain the limit position.

[0161] In practice, the main hull 2 ​​is provided with a vertically distributed first compartment pin 23 on both sides of each guide tube 5;

[0162] The first internal pin 23 has a horizontal through hole in the horizontal direction, which is located at 1 / 6 of the length of the first internal pin 23 from the top.

[0163] The bottom end of the first internal pin 23 is fixedly connected to the bottom plate of the main hull 2, and the top end is fixedly connected to the hull deck of the main hull 2. When a limit is required, the second internal pin 51 is horizontally inserted through the pre-reserved horizontal through hole on the guide tube 5, and then inserted into the horizontal through hole on the first internal pin 23.

[0164] The bottom end of the internal fixed support 223 is fixed to the bottom plate of the hull of the main hull 2, and the top end is used to support the second internal latch 51, which serves to restrain vertical displacement.

[0165] In this invention, for specific implementation, see [link to relevant documentation]. Figure 14 The lower frame 6 slides vertically up and down along the guide tube 5, specifically through the sliding rail 52 and the sliding steel plate 53 fixed on the guide tube 5.

[0166] In specific implementation, the sliding track 52 is a vertically distributed groove structure located in the guide tube 5, and is distributed radially in the length direction of the guide tube 5 with equal depth in the radial direction;

[0167] The front end of the sliding steel plate 53 has a wedge-shaped block that matches the sliding rail 52, and the rear end is a flat steel plate structure.

[0168] The wedge-shaped block slides into the groove structure of the sliding track 52 to achieve a complete fit for sliding.

[0169] The lower frame 6 (specifically, a section of steel pipe adjacent to the guide tube 5) is fixedly connected to the flat steel plate at the tail end of the sliding steel plate 53.

[0170] Therefore, based on the above structural design, the lower frame 6 slides vertically on the guide tube 5 (i.e. along the guide tube) through the sliding steel plate 53 and the sliding rail 52.

[0171] In practice, a rolling bearing is provided between the wedge-shaped block at the front end of the sliding steel plate 53 and the sliding track 52 to reduce sliding friction;

[0172] In this invention, specifically, once the cylindrical foundation structure 1 is installed at the destination, the guide pipe can be lifted and retracted by the lifting equipment (e.g., a small crane) on the main hull 2.

[0173] In this invention, specifically, the bottom edges of the cylindrical foundation 11 of each cylindrical foundation structure 1 are fixedly connected to the bottom of the lower frame 6 by four horizontal limiting cables 7.

[0174] The projection of each horizontal limiting cable 7 onto the horizontal plane is distributed radially along the cylindrical foundation 11 of the cylindrical foundation overall structure 1.

[0175] The four horizontal limiting cables 7 are symmetrically distributed front and back;

[0176] In practice, the angle between the projections of the two horizontal limiting cables 7 on the front side onto the horizontal plane is equal to the angle between the projections of the two horizontal limiting cables 7 on the rear side onto the horizontal plane.

[0177] In practice, the horizontal limiting cable 7 is distributed at an angle from the inside out (i.e. from the bottom of the cylindrical foundation 11 to the bottom of the lower frame 6), and its height gradually decreases.

[0178] It should be noted that, for the present invention, the horizontal limiting effect of the lower frame 6 on the cylindrical foundation structure 1 can be achieved by the horizontal limiting cable 7.

[0179] It should be noted that, for the present invention, when the vessel is floated to its destination and the cylindrical foundation structure 1 is installed, the lower frame 6 is lifted and retracted by the lifting equipment (e.g., a small crane) on the main hull 2.

[0180] See Figures 4 to 11 The present invention also provides an installation method for a multi-turbine floating platform for offshore wind power, which includes a pre-floating loading operation stage and an installation operation stage at the installation site.

[0181] The pre-ship loading operation phase includes the following steps:

[0182] Step S101: Undocking the cylindrical foundation 11: For any cylindrical foundation 11 to be installed, the cylindrical foundation 11 is prefabricated in the dock 8. By opening the gate to release water (i.e., filling the dock 8 with water), the cylindrical foundation 11 becomes self-floating in the dock 8. Then, the cylindrical foundation 11 is pulled by a winch to complete the undocking operation.

[0183] It should be noted that once the water level inside the dock 8 reaches a certain height, the cylindrical foundation 11 begins to have self-floating capability. At this point, it is slowly pulled towards the dock opening by a winch until the cylindrical foundation 11 is successfully unloaded.

[0184] Step S102: Loading the cylindrical foundation 11 onto the ship: The main hull 2 ​​is pre-anchored and positioned at the outlet of the dock 8. After the cylindrical foundation 11 is unloaded, the cylindrical foundation 11 is inserted into the U-shaped groove 21 of the main hull 2 ​​by the traction equipment (e.g., winch) on the main hull 2. Then, the bottom of the cylindrical foundation 11 is tied to the bottom of the lower frame 6 using the horizontal limiting cable 7, and the pre-set lifting point at the top cover of the cylindrical foundation 11 is tied to the top frame of the truss structure 3 set on the main hull 2 ​​using the vertical tension cable 4.

[0185] The main hull 2 ​​is provided with multiple (e.g., four) U-shaped grooves 21;

[0186] It should be noted that at this stage, the vertical tension cable 4 has the ability to provide the difference between the gravity and buoyancy of the cylindrical foundation structure 1, so that the gravity of the cylindrical foundation 11 can be completely resisted by its own buoyancy, which helps to avoid the use of large lifting equipment.

[0187] It should be noted that the vertical tension cable 4 is installed before the tower 13 is hoisted to ensure that no large swaying motion occurs when the tower 13 and the wind turbine 14 are hoisted.

[0188] Step S103: Hoisting Tower 13 and Fan 14: After the cylindrical foundation 11 is inserted into the main hull 2 ​​and secured, the tower 13 is hoisted into the vertically penetrating tower placement slot located directly above the U-shaped groove 21 in the truss structure 3. Then, the bottom of the tower 13 is fixedly connected to the top of the cylindrical foundation 11, and the fan 14 with blades is installed on the top of the tower 13.

[0189] It should be noted that during this process, the vertical tension cable 4 bears the difference between the weight and buoyancy of the cylindrical foundation structure 1 itself.

[0190] Step S104: Repeat steps S101 to S103 until all U-shaped grooves 21 of the main hull 2 ​​are filled with cylindrical foundations 11, and the towers 13 and wind turbines 14 are installed on all cylindrical foundations 11, thereby completing the ship loading operation of the entire cylindrical foundation structure 1 on the main hull 2.

[0191] The installation operation phase at the installation site includes the following steps:

[0192] Step S201, Lowering the guide tube 5: See Figure 8 As shown, when the main hull 2 ​​is floated (for example by being towed by an external tugboat) to the installation site of a cylindrical foundation structure 1, after anchoring and positioning, all the guide pipes 5 are lowered to the seabed surface 100.

[0193] It should be noted that all guide tubes 5 are lowered by a pile hammer, that is, the top of the guide tube 5 is struck by the pile hammer to make the guide tube 5 move downward.

[0194] It should be noted that in this invention, multiple guide pipes 5 are lowered instead of traditional pile shoes or flat plate structures to address uneven seabed conditions. During this stage, the main hull 2 ​​gradually transitions from a floating mode to a standing mode, at which point the weight of the entire structure is entirely borne by the guide pipes 5.

[0195] Step S202, lower the lower frame 6: See Figure 9 As shown, before lowering the lower frame 6, the horizontal limiting cable 7 at the bottom of the cylindrical foundation 11 of the cylindrical foundation structure 1 of the lower frame 6 and the cylindrical foundation 6 should be slowly tensioned. Then, the cylindrical foundation 11 is slowly lowered (specifically, by inflating and pumping water into the cylindrical foundation 11, the air pressure inside the cylindrical foundation 11 is adjusted to achieve slow lowering). During this process, the longitudinal tensioning cable 4 is used to release the cable so that the bottom of the cylindrical foundation 11 and the bottom of the lower frame 6 have the same elevation, and then they begin to sink simultaneously.

[0196] It should be noted that at this stage, the guide tube 5 and the lower frame 6 share the load of the environment.

[0197] Step S203, release the cable upon bottoming out: See Figure 10 As shown, when the cylindrical foundation 11 and the lower frame 6 touch the seabed together, the horizontal limiting cable 7 and the longitudinal tension cable 4 are released.

[0198] It should be noted that when the cylindrical foundation 11 and the lower frame 6 touch the seabed together, the overall structural gravity and environmental load are borne by the cylindrical foundation 11, the lower frame 6 and the guide pipe 5. Therefore, the horizontal limiting cable 7 and the longitudinal tension cable 4 can be released at this time.

[0199] Step S204, basic placement in place: See Figure 11 As shown, by pumping water from the internal cavity of the cylindrical foundation 11 of the cylindrical foundation structure 1 (for example, through a water pump and a pre-drilled hole at the top of the cylindrical foundation 11, which can be sealed with a sealing cap), a negative pressure environment is created, thereby driving the cylindrical foundation 11 vertically downwards into the seabed, thus completing the installation of the cylindrical foundation structure 1. At this point, the horizontal limiting cable 7, the longitudinal tension cable 4, and the lower frame 6 can be retracted, and the main hull 2 ​​can be towed to the next foundation installation site.

[0200] Step S205: Repeat steps S201 to S204 to complete the installation of all cylindrical foundation structures 1 on the main hull 2.

[0201] In summary, compared with existing technologies, the floating platform for multiple offshore wind turbines and its installation method provided by this invention are scientifically designed. Compared with existing technologies, this invention can simultaneously transport multiple offshore wind turbine cylindrical foundation structures, facilitating the large-scale floating and rapid installation of multiple offshore wind turbine cylindrical foundation structures. It can effectively reduce the installation cost during large-scale offshore wind power construction, meet the needs of large-scale offshore wind power development, and has significant practical significance.

[0202] The present invention provides a specially designed installation method for a multi-turbine floating platform for offshore wind power. By making reasonable use of the inherent buoyancy and stability characteristics of the cylindrical foundation, and by using a cable system, a guide system, and a subframe system, it can cleverly avoid the use of large-scale lifting equipment. While meeting the requirements for large-scale floating installation, it shortens the construction period of the cylindrical foundation and its entire turbine structure at sea, and improves the stability and safety of the offshore wind power cylindrical foundation and its entire turbine structure during floating installation at sea, providing a new direction for the large-scale and efficient construction of offshore wind power.

[0203] After testing, the technical solution of the present invention, under the premise of economic feasibility and construction convenience, can simultaneously float multiple cylindrical foundation structures. By using auxiliary cables for limiting, the use of large lifting equipment is reduced, thereby achieving cost reduction in the installation of cylindrical foundations and their overall structures.

[0204] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-unit floating platform for offshore wind power, characterized in that, It includes the main hull (2), truss structure (3), multiple vertical tension cables (4), multiple guide tubes (5) and lower frame (6); The main hull (2) is used to accommodate multiple cylindrical foundation structures (1) and to provide lateral constraints for the cylindrical foundation structures (1), thereby assisting the cylindrical foundation structures (1) in floating at sea as a whole. A truss structure (3) is set on top of the main hull (2) to provide lateral support for multiple cylindrical foundation structures (1); Each cylindrical foundation structure (1) includes a cylindrical foundation (11), an arc-shaped transition section (12), and a tower (13). The cylindrical foundation (11) is a cylindrical tube with an open bottom; The arc-shaped transition section (12) is vertically provided at the top center of the cylindrical foundation (11). The tower (13) is vertically installed at the top of the arc-shaped transition section (12). For each cylindrical foundation structure (1), the top of the cylindrical foundation (11) is fixedly connected to the lower end of a vertical tension cable (4). The vertical tension cable (4) is vertically distributed and its upper end is fixedly connected to the top of the truss structure (3). The vertical tension cable (4) is used to provide a vertically upward tension for the cylindrical foundation structure (1). The left and right ends of the main hull (2) are respectively provided with the same number of U-shaped grooves (21). Each U-shaped groove (21) is used to accommodate a cylindrical basic machine structure (1); The lower frame (6) is provided at the bottom of the main hull (2); The lower frame (6) is used to detachably install the cylindrical foundation structure (1). Multiple guide tubes (5) are vertically installed in the lower frame (6); Each guide tube (5) is slidably connected to the main hull (2) in the vertical direction to play a guiding role in the vertical direction when installing the cylindrical foundation structure (1) in the main hull (2); The main hull (2) is provided with a vertical through hole for each guide tube (5) at a position corresponding to each guide tube; Inside the main hull (2), around each guide tube vertical through hole, there is an in-cabin sliding assembly (22). The in-cabin sliding assembly (22) includes a rolling bearing (221), an outer shell (222), and an in-cabin fixed support (223). The outer hull (222) is located within the main hull (2); The sliding bearing (221) is located inside the housing (222); The guide tube (5) passes vertically through the inner ring of the sliding bearing (221); The fixed support (223) inside the cabin is located in the main hull (2), and the outer shell (222) is located in its inner cavity; The lower frame (6) is used to slide vertically up and down along the guide tube (5), specifically through a sliding rail (52) and a sliding steel plate (53) fixed on the guide tube (5); The sliding track (52) is a vertically distributed groove structure in the guide tube (5) and is distributed radially along the length of the guide tube (5); The front end of the sliding steel plate (53) has a wedge-shaped block that matches the sliding track (52), and the rear end is a flat steel plate structure; The wedge-shaped block slides into the groove structure of the sliding track (52); The lower frame (6) is fixedly connected to the flat steel plate at the tail end of the sliding steel plate (53).

2. The offshore wind power multi-unit floating platform as described in claim 1, characterized in that, The lower frame (6) and the truss structure (3) are both hollow frame structures; The shape of the tower (13) is a frustum conical shape; A fan (14) is installed at the top of the tower (13). The fan (14) has multiple blades.

3. The offshore wind power multi-unit floating platform as described in claim 1, characterized in that, Two U-shaped grooves (21) are symmetrically provided at the left and right ends of the main hull (2); Each U-shaped groove (21) is used to accommodate a cylindrical basic machine structure (1); The lower frame (6) is provided with a cylindrical base with vertical vertical penetration into the cavity at the position corresponding to each U-shaped groove (21); A cylindrical foundation is placed into a cavity to accommodate the cylindrical foundation (11) of the whole machine structure (1).

4. The offshore wind power multi-unit floating platform as described in claim 3, characterized in that, The diameter of the arc segment of the U-shaped groove (21) on the main hull (2) is larger than the diameter of the cylindrical foundation (11) of the cylindrical foundation structure (1); The top height of the truss structure (3) is equal to half the overall height of the cylindrical foundation structure (1); Each vertical tension cable (4) provides an upward vertical tension to a corresponding cylindrical foundation structure (1), which is equal to the difference between the weight and buoyancy of a cylindrical foundation structure (1).

5. The offshore wind power multi-unit floating platform as described in claim 1, characterized in that, The top of the truss structure (3) is connected to the tower (13) in each cylindrical foundation structure (1) by a clamping device (31); A clamping device (31) is used to provide lateral support for the tower (13); Each clamping device (31) includes an arc-shaped clamping ring (311), an arc-shaped snap ring (312), a first pin (313), and a second pin (314). The tower (13) is located inside the clamping ring (311) and the snap ring (312); Rubber pads are provided between the inner sides of the clamping ring (311) and the snap ring (312) and the outer side of the tower (13).

6. The offshore wind power multi-unit floating platform as described in claim 5, characterized in that, The two ends of the clamping ring (311) are a fixed end and a free end, respectively; The fixed end of the clamping ring (311) is fixedly connected to the snap ring (312) through the first pin (313); The free end of the clamping ring (311) extends into the buckle ring (312) and is provided with horizontally distributed, arc-shaped clamping ring insertion grooves; The free end of the clamping ring (311) is fixedly connected to the snap ring (312) by the second pin (314); The snap ring (312) is fixedly connected to the truss structure (3).

7. The offshore wind power multi-turbine floating platform as described in claim 1, characterized in that, The bottom edges of the cylindrical foundation (11) of each cylindrical foundation structure (1) are fixedly connected to the bottom of the lower frame (6) by four horizontal limiting cables (7); The projection of each horizontal limiting cable (7) on the horizontal plane is distributed radially along the cylindrical foundation (11) of the cylindrical foundation overall structure (1); The four horizontal limiting cables (7) are symmetrically distributed front and back; The angle between the projections of the two horizontal limiting cables (7) on the front side onto the horizontal plane is equal to the angle between the projections of the two horizontal limiting cables (7) on the rear side onto the horizontal plane. The horizontal limiting cable (7) is distributed at an angle from the bottom of the cylindrical foundation (11) to the bottom of the lower frame (6), and the height gradually decreases.

8. A method for installing a multi-turbine floating platform for offshore wind power as described in any one of claims 1 to 7, characterized in that, This includes the pre-shipment floating operation phase and the on-site installation operation phase. The pre-ship loading operation phase includes the following steps: Step S101: Undocking of cylindrical foundation (11): For any cylindrical foundation (11) to be installed, the cylindrical foundation (11) is prefabricated in the dock (8). By opening the gate to release water, the cylindrical foundation (11) has the ability to float in the dock (8). Then, the cylindrical foundation (11) is pulled by a winch to complete the undocking operation. Step S102: Loading the cylindrical foundation (11) onto the ship: The main hull (2) is pre-anchored and positioned at the outlet of the dock (8). After the cylindrical foundation (11) is unloaded, the cylindrical foundation (11) is inserted into the U-shaped groove (21) of the main hull (2) by the traction equipment on the main hull (2). Then, the bottom of the cylindrical foundation (11) is tied to the bottom of the lower frame (6) using the horizontal limiting cable (7), and the pre-set lifting point at the top of the cylindrical foundation (11) is tied to the top frame of the truss structure (3) set on the main hull (2) using the vertical tension cable (4). The main hull (2) is provided with multiple U-shaped grooves (21); Step S103: Hoisting the tower (13) and the fan (14): After the cylindrical foundation (11) is inserted into the main hull (2) and secured, the tower (13) is hoisted into the vertically penetrating tower placement slot located directly above the U-shaped groove (21) in the truss structure (3). Then, the bottom of the tower (13) is fixedly connected to the top of the cylindrical foundation (11), and the fan (14) with blades is installed on the top of the tower (13). Step S104: Repeat steps S101 to S103 until all U-shaped grooves (21) of the main hull (2) are filled with cylindrical foundations (11), and the tower (13) and wind turbine (14) are installed on all cylindrical foundations (11), thereby completing the loading operation of the entire cylindrical foundation structure (1) on the main hull (2); The installation operation phase at the installation site includes the following steps: Step S201, lowering guide pipes (5): When the main hull (2) is floated to the installation site of a cylindrical foundation structure (1), after anchoring and positioning, all guide pipes (5) are lowered to the seabed surface (100). Step S202, lowering the lower frame (6): Before lowering the lower frame (6), firstly, the horizontal limiting cable (7) at the bottom of the cylindrical foundation (11) of the cylindrical foundation whole structure (1) of the lower frame (6) and the cylindrical foundation (1) should be slowly tensioned, and then the cylindrical foundation (1) should be slowly lowered. During this process, the longitudinal tensioning cable (4) should be used to release the cable so that the bottom of the cylindrical foundation (11) and the bottom of the lower frame (6) have the same elevation, and then they should be lowered at the same time. Step S203, release the cables upon contact with the seabed: when the cylindrical foundation (11) and the lower frame (6) touch the seabed together, release the horizontal limiting cable (7) and the longitudinal tension cable (4). Step S204, Foundation placement: By pumping water into the internal cavity of the cylindrical foundation (11) of the cylindrical foundation structure (1), a negative pressure environment is formed, thereby vertically inserting the cylindrical foundation (11) into the seabed and completing the installation of the cylindrical foundation structure (1). Step S205: Repeat steps S201 to S204 to complete the installation of all cylindrical foundation structures (1) on the main hull (2).

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