Full-submersible floating type fan foundation

Abstract

The invention relates to the technical field of equipment for fixing ocean structures, and provides a full-submersible floating type fan foundation which comprises a plurality of floating type foundation buoys. The plurality of floating foundation buoys are connected to the same plane through buoy horizontal connecting rods, and the middle position where the plurality of floating foundation buoys are distributed is fixedly connected with a floating body and tower connecting platform used for installing a fan tower; a gravity mooring rope is fixedly connected to the bottom of each floating type foundation buoy, the lower ends of the multiple gravity mooring ropes are fixedly connected to the concrete gravity type foundation, and the multiple gravity mooring ropes are consistent in length. The structure and the construction method are simple, the cost is low, the floating foundation can be fixed below the extremely low tide level through the concrete gravity type foundation, the influence of waves on the floating foundation is avoided, and the safety of the structure is improved; transportation cost is low, installation and operation are easy, typhoons and ocean currents can be resisted, and the device is especially suitable for deep and far seas and has no requirement for geology.

Description

Technical Field

[0001] The invention relates to a fully submerged floating wind turbine foundation, belonging to the technical field of equipment for fixing marine structures. Background Art

[0002] As the main body that occupies 70% of the earth's surface, the ocean not only has rich resources such as aquatic products and oil, but also contains huge energy. Offshore wind power has become the main form of marine energy. At present, offshore wind power is mainly based on fixed foundations, but fixed foundations are only suitable for shallow seas with a water depth of less than 50m. With the acceleration of offshore wind power development, industry technological innovation and potential requirements for large-scale development, the development of offshore wind energy resources will tend to be saturated, and the development of offshore wind power to deep sea is inevitable. Deep sea wind energy resources are rich, and the wind energy density above 50m is about 2 to 4 times that of offshore areas, which has extremely high development value. The design, construction and construction difficulties of fixed foundations will increase significantly, and at the same time, the investment cost will increase significantly. It is not suitable for offshore wind power development under deep sea conditions. Floating foundations will inevitably become the main foundation form. At present, floating offshore wind power foundations are mainly divided into three categories: semi-submersible (Semi-sub), column type (Spar), and tension leg type (TLP). Regardless of the form, it is difficult to avoid the impact of waves on the floating foundation, so it is unable to resist typhoons and ocean currents. It has high geological requirements, resulting in poor structural safety and is difficult to adapt to the installation and use needs of offshore wind power generation in the deep sea. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a fully submersible floating wind turbine foundation, which can fix the floating foundation below the extreme low tide level through a concrete gravity foundation, avoid the impact of waves on the floating foundation, and improve the safety of the structure.

[0004] The present invention is achieved through the following technical solutions.

[0005] A fully submerged floating wind turbine foundation provided by the present invention comprises a plurality of floating foundation buoys; the plurality of floating foundation buoys are connected in the same plane by horizontal buoy connecting rods, a floating body and a tower connecting platform for installing a wind turbine tower are connected and fixed at the middle position of the plurality of floating foundation buoys; a gravity cable is connected and fixed to the bottom of each floating foundation buoy, the lower ends of the plurality of gravity cables are connected and fixed to a concrete gravity foundation, and the lengths of the plurality of gravity cables are consistent; in vertical projection, the center positions of the plurality of floating foundation buoys coincide with the center position of the concrete gravity foundation; the plurality of floating foundation buoys are also connected to a plurality of mooring cables.

[0006] There are six floating foundation buoys, which are connected to form a hexagonal structure.

[0007] The concrete gravity foundation is in the shape of a disk.

[0008] The floating body and tower connection platform are connected and fixed to the floating body horizontal connection rod through a plurality of floating body diagonal support connection rods.

[0009] The lengths of the plurality of buoy diagonal support connecting rods are consistent.

[0010] A transition foundation is fixed on the platform connecting the floating body and the tower, and the wind turbine tower is installed on the transition foundation.

[0011] The weight of the concrete gravity foundation satisfies that the gravity of the concrete gravity foundation is greater than twice the total buoyancy of the plurality of floating foundation buoys.

[0012] The floating foundation buoy is provided with a sliding hole, and the buoy horizontal connecting rod and the gravity cable both pass through the sliding hole.

[0013] When the concrete gravity foundation is deployed, the concrete gravity foundation and the gravity cable are first connected and installed, and then an air bag is connected to the top of the gravity cable. The concrete gravity foundation tugboat drags the concrete gravity foundation through the concrete gravity foundation tugboat cable to drive the concrete gravity foundation to move until the concrete gravity foundation reaches a predetermined position. The gravity cable is then connected to the floating foundation buoy, and then the concrete gravity foundation tugboat cable is removed, and finally the air bag is deflated and removed.

[0014] When deploying the floating foundation buoy, the floating foundation buoy, the buoy horizontal connecting rod, the buoy and tower connecting platform and the wind turbine tower are first connected and installed, and then the floating foundation tugboat is used to drag the buoy horizontal connecting rod through the floating foundation tugboat cable to drive the floating foundation buoy to a predetermined position, and then the gravity cable is connected to the floating foundation buoy, and the floating foundation tugboat cable is removed.

[0015] The beneficial effects of the present invention are: the structure and construction method are simple and the cost is low. The floating foundation can be fixed below the extreme low tide level through a concrete gravity foundation to avoid the impact of waves on the floating foundation and improve the safety of the structure; the transportation cost is low, the installation operation is simple, and it can withstand typhoons and ocean currents, and is particularly suitable for deep sea and has no requirements for geology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the structure of at least one embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure when in use; Figure 3 yes Figure 1 A top view of Figure 4 yes Figure 1Schematic diagram of the concrete gravity foundation during transportation; Figure 5 yes Figure 1 Schematic diagram of the principle of the mid-floating foundation buoy during transportation.

[0017] In the figure: 1-concrete gravity foundation, 2-gravity cable, 3-floating foundation buoy, 4-buoy horizontal connecting rod, 5-floating body and tower connection platform, 6-transition foundation, 7-buoy diagonal bracing connecting rod, 8-concrete gravity foundation tugboat, 9-slide hole, 10-wind turbine tower, 11-concrete gravity foundation tugboat cable, 12-airbag, 13-airbag cable, 14-floating body foundation tugboat, 15-floating body foundation tugboat cable, 16-mooring cable. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0019] A first embodiment of the present invention relates to Figures 1 to 3 A fully submerged floating wind turbine foundation is shown, comprising a plurality of floating foundation buoys 3; the plurality of floating foundation buoys 3 are connected in the same plane by horizontal buoy connecting rods 4, a floating body and tower connecting platform 5 for installing a wind turbine tower 10 is connected and fixed to the middle position of the plurality of floating foundation buoys 3; a gravity cable 2 is connected and fixed to the bottom of each floating foundation buoy 3, the lower ends of the plurality of gravity cables 2 are connected and fixed to a concrete gravity foundation 1, and the lengths of the plurality of gravity cables 2 are the same; in vertical projection, the center positions of the plurality of floating foundation buoys 3 coincide with the center positions of the concrete gravity foundation 1; the plurality of floating foundation buoys 3 are also connected to a plurality of mooring cables 16.

[0020] The second embodiment of the present invention is substantially the same as the first embodiment, mainly in that there are six floating foundation buoys 3 connected to form a hexagonal structure.

[0021] Furthermore, the concrete gravity foundation 1 is disc-shaped.

[0022] Furthermore, the buoy and tower connection platform 5 is connected and fixed to the buoy horizontal connection rod 4 through a plurality of buoy diagonal support connection rods 7 .

[0023] Furthermore, the lengths of the plurality of buoy diagonal support connecting rods 7 are consistent.

[0024] The third embodiment of the present invention is substantially the same as the first embodiment, mainly in that a transition foundation 6 is fixed on the floating body and tower connection platform 5 , and the wind turbine tower 10 is installed on the transition foundation 6 .

[0025] Furthermore, the weight of the concrete gravity foundation 1 satisfies that the gravity of the concrete gravity foundation 1 is greater than twice the total buoyancy of the multiple floating foundation buoys 3 .

[0026] Furthermore, a sliding hole 9 is opened on the floating foundation buoy 3, and the buoy horizontal connecting rod 4 and the gravity cable 2 both pass through the sliding hole 9.

[0027] The fourth embodiment of the present invention is substantially the same as the first embodiment, mainly in that, when the concrete gravity foundation 1 is deployed, the concrete gravity foundation 1 and the gravity cable 2 are first connected and installed, and then the airbag 12 is connected to the top of the gravity cable 2, and the concrete gravity foundation tugboat 8 drags the concrete gravity foundation 1 through the concrete gravity foundation tugboat cable 11 to drive the concrete gravity foundation 1 to move until the concrete gravity foundation 1 reaches the predetermined position, and then the gravity cable 2 is connected to the floating foundation buoy 3, and then the concrete gravity foundation tugboat cable 11 is removed, and finally the airbag 12 is deflated and removed.

[0028] Furthermore, when the floating foundation buoy 3 is deployed, the floating foundation buoy 3, the buoy horizontal connecting rod 4, the buoy and tower connecting platform 5 and the wind turbine tower 10 are first connected and installed, and then the floating foundation tugboat 14 is used to drag the buoy horizontal connecting rod 4 through the floating foundation tugboat cable 15 to drive the floating foundation buoy 3 to a predetermined position, and then the gravity cable 2 is connected to the floating foundation buoy 3, and the floating foundation tugboat cable 15 is removed.

[0029] Generally speaking, the floating foundation is connected to the concrete gravity foundation 1 through a gravity cable. The gravity cable is fixedly connected to the gravity foundation and slidably connected to the floating foundation. The gravity cable passes through the sliding hole 9 of the horizontal connecting rod 4 of the floating body at the bottom of the floating foundation, enters the diagonal connecting rod 7 and is connected to the floating body and tower connection platform 5. Six winches are arranged in the floating body and tower connection platform 5 to control the gravity cables in six directions. The floating foundation is sunk and the stability of the floating foundation is controlled by adjusting the winches. The top of the floating foundation is connected to a transition foundation 6 (this foundation can be designed as a single pile or a conductor frame), and is connected to the wind turbine tower 10 through a transition section. A mooring cable is arranged in the middle of the floating foundation, and the horizontal movement of the floating foundation can be controlled by the mooring cable 16.

[0030] Specifically, the method for transporting and installing the concrete gravity foundation 1 is as follows: during transportation, the concrete gravity foundation 1 and the floating foundation are transported separately, the concrete gravity foundation 1 is assembled with the gravity cable 2 for transportation, an appropriate air bag 10 is set on the concrete gravity foundation 1, and an air bag 10 is set on the end of each gravity cable 2 to facilitate the subsequent installation with the floating foundation, the buoyancy of the air bag 10 is used to keep the concrete gravity foundation 1 above the mud surface for towing transportation, and then the concrete gravity foundation is towed to the wind turbine location by the tugboat 8. The concrete gravity foundation is slowly released by releasing the air bag 10, and after the concrete gravity foundation 1 is in place, the concrete gravity foundation 1 needs to be fixed on it to ensure that the foundation will not sink and move within the design life to meet the requirements. After it is in place, the concrete gravity foundation needs to be simply adjusted to keep the concrete gravity foundation 1 horizontal and stable, and do a good job of scour protection.

[0031] The floating foundation is transported by assembling the floating foundation and the foundation transition section 6 (hereinafter referred to as the floating foundation), and the wind turbine tower and the parts above can be assembled or separated for transportation as the case may be. The floating foundation is transported by wet towing, and is towed to the wind turbine point by a tugboat 14 for installation.

[0032] The main installation method is to slowly move the floating foundation tugboat to drag the floating foundation above the concrete gravity foundation 1 after the concrete gravity foundation 1 and the floating foundation are in place, and pass the gravity cable 2 through the sliding hole 9 of the floating foundation. The floating foundation is completely sunk to the extreme low tide level by adjusting the gravity cable 2. The buoyancy of the floating foundation must have sufficient buoyancy and avoid the impact of waves on the foundation. The gravity of the concrete gravity foundation 1 must be much greater than the buoyancy of the floating foundation to ensure that the sinking displacement of the floating foundation and the wind turbine under extreme conditions meets the requirements. After the gravity cable 2 is connected and adjusted, the mooring cable 16 is connected, and the mooring cable can ensure the horizontal displacement of the structure.

Claims

1. A fully submerged floating wind turbine foundation, comprising a plurality of floating foundation buoys (3), characterized in that: The plurality of floating foundation buoys (3) are connected in the same plane by means of a buoy horizontal connecting rod (4); a floating body and tower connecting platform (5) for installing a wind turbine tower (10) is connected and fixed at the middle position of the plurality of floating foundation buoys (3); a gravity cable (2) is connected and fixed at the bottom of each floating foundation buoy (3); the lower ends of the plurality of gravity cables (2) are connected and fixed to a concrete gravity foundation (1); the plurality of gravity cables (2) have the same length; in vertical projection, the center positions of the plurality of floating foundation buoys (3) coincide with the center position of the concrete gravity foundation (1); and the plurality of floating foundation buoys (3) are additionally connected to a plurality of mooring cables (16).

2. The fully submersible floating wind turbine foundation according to claim 1, characterized in that: There are six floating foundation buoys (3) which are connected to form a hexagonal structure.

3. The fully submerged floating wind turbine foundation according to claim 1, characterized in that: The concrete gravity foundation (1) is disc-shaped.

4. The fully submersible floating wind turbine foundation according to claim 1, characterized in that: The buoy and tower connection platform (5) is connected and fixed to the buoy horizontal connection rod (4) via a plurality of buoy diagonal support connection rods (7).

5. The fully submerged floating wind turbine foundation according to claim 4, characterized in that: The lengths of the plurality of buoy diagonal support connecting rods (7) are consistent.

6. The fully submersible floating wind turbine foundation according to claim 1, characterized in that: A transition foundation (6) is fixed on the floating body and tower connection platform (5), and the wind turbine tower (10) is installed on the transition foundation (6).

7. The fully submersible floating wind turbine foundation according to claim 1, characterized in that: The weight of the concrete gravity foundation (1) satisfies that the gravity of the concrete gravity foundation (1) is greater than twice the total buoyancy of the plurality of floating foundation buoys (3).

8. The fully submersible floating wind turbine foundation according to claim 1, characterized in that: The floating foundation buoy (3) is provided with a sliding hole (9), and the buoy horizontal connecting rod (4) and the gravity cable (2) both pass through the sliding hole (9).

9. The fully submersible floating wind turbine foundation according to claim 1, characterized in that: When the concrete gravity foundation (1) is deployed, the concrete gravity foundation (1) and the gravity cable (2) are first connected and installed, and then the air bag (12) is connected to the top of the gravity cable (2). The concrete gravity foundation tugboat (8) tows the concrete gravity foundation (1) through the concrete gravity foundation tugboat cable (11) to drive the concrete gravity foundation (1) to move until the concrete gravity foundation (1) reaches a predetermined position. Then, the gravity cable (2) is connected to the floating foundation buoy (3), and then the concrete gravity foundation tugboat cable (11) is removed. Finally, the air bag (12) is deflated and removed.

10. The fully submerged floating wind turbine foundation according to claim 1, characterized in that: When the floating foundation buoy (3) is deployed, the floating foundation buoy (3), the buoy horizontal connecting rod (4), the buoy and tower connecting platform (5) and the wind turbine tower (10) are first connected and installed, and then the floating foundation tugboat (14) is used to drag the buoy horizontal connecting rod (4) through the floating foundation tugboat cable (15) to drive the floating foundation buoy (3) to a predetermined position, and then the gravity cable (2) is connected to the floating foundation buoy (3), and the floating foundation tugboat cable (15) is removed.

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