Semi-submersible floating type fan foundation

Abstract

The utility model discloses a semi-submersible floating type draught fan foundation which comprises three supporting stand columns, two middle stand columns, a truss structure, two upwind tower barrels and two downwind tower barrels. The three supporting stand columns are the upwind supporting stand column and the two downwind supporting stand columns respectively, the two middle stand columns are arranged between the upwind supporting stand column and the two downwind supporting stand columns respectively, and each middle stand column is connected with the adjacent upwind supporting stand column and the adjacent downwind supporting stand column through a truss structure. The bottom ends of the two upwind tower cylinders are connected with the top ends of the two middle stand columns respectively, the bottom ends of the two downwind tower cylinders are connected with the top ends of the two downwind supporting stand columns respectively, and the top ends of the two upwind tower cylinders and the top ends of the two downwind tower cylinders intersect at one point and are connected. On the premise that the requirements for stability and movement performance of the floating body are met, the steel consumption of the foundation can be effectively reduced, and the cost of the foundation structure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power foundations, in particular to a semi-submersible floating wind turbine foundation. Background Art

[0002] As the development of near-shore resources approaches saturation, the offshore wind power industry is gradually moving towards the deep sea, and the water depth is also increasing. Traditional fixed foundations have reached an important juncture for upgrading. Floating wind turbine foundations that install wind turbines on floating platforms are the best choice to solve this problem. However, since the amount of steel used in floating wind turbine foundations is still high, floating wind turbines are not cost-effective. Therefore, it is increasingly important to explore ways to reduce the cost of floating wind turbines. Utility Model Content

[0003] The purpose of the present utility model is to overcome the shortcomings of the existing technology and provide a semi-submersible floating wind turbine foundation. Under the premise of meeting the requirements of floating body stability and movement performance, a four-tower support scheme is adopted to reduce the load transmitted to the foundation, and the smaller tower load can keep the tower weight and the single tower weight similar, thereby achieving cost reduction of the foundation structure.

[0004] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0005] The yoke is connected to the bottom of the yoke by means of a truss structure, and the bottom ends of the two yokes are connected to the top ends of the yokes and the bottom ends of the yokes are connected to the top ends of the yokes.

[0006] Furthermore, the supporting column is in a dumbbell-shaped structure that is wide at both ends and narrow in the middle.

[0007] Furthermore, the support column is composed of a lower large diameter section, a lower variable cross-section section, a middle small diameter section, an upper variable cross-section section and an upper large diameter section which are connected in sequence.

[0008] Furthermore, the diameter of the lower large diameter section is 18m and the height is 8m, the diameter of the lower variable cross-section section changes linearly from 18m to 14m from bottom to top, and the height is 3m, the diameter of the middle small diameter section is 14m and the height is 14m, the diameter of the upper variable cross-section section changes linearly from 14m to 18m from bottom to top, and the height is 3m, and the diameter of the upper large diameter section is 18m and the height is 5m.

[0009] Furthermore, the middle column is in the shape of a straight cylinder.

[0010] Furthermore, the diameter of the middle column is 14m and the height is 35m.

[0011] Furthermore, the truss structure includes two horizontal struts parallel to each other and a diagonal strut arranged between the two horizontal struts.

[0012] Furthermore, a ballast tank for providing overall ballast for the semi-submersible floating wind turbine is provided at the lower portion of the supporting column.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0014] 1. The foundation of this utility model adopts an all-steel structure layout, which can be produced in a modular manner and is easy to install and produce.

[0015] 2. The support columns of the present invention are arranged in a dumbbell shape. The cross-sectional diameter of the support columns within the wave range is smaller, so that the columns only bear smaller wave loads. The cross-sectional diameters at both ends of the support columns are larger, so that the support columns have better stability. The wider cross-sectional area of the support columns at the inclined upper part of the floating body can provide a larger buoyancy reserve and thus provide greater stability.

[0016] 3. The utility model adopts four towers to jointly support the wind turbine structure, which can greatly reduce the load transmitted from the tower to the foundation, thereby reducing the amount of steel used in the floating foundation.

[0017] 4. The foundation of the present invention adopts an equilateral triangle structure, presenting an axisymmetric structure, which is easy to achieve a positive floating state by adjusting the ballast water.

[0018] 5. The columns of the utility model are connected by thinner horizontal struts, and the horizontal struts are connected by thinner diagonal struts. The overall structure presents a truss structure, which can reduce the amount of steel used in the floating foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a semi-submersible floating wind turbine foundation. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, this embodiment provides a semi-submersible floating wind turbine foundation, including three supporting columns, two middle columns 3, a truss structure, two upwind towers 4, two downwind towers 5 and multiple anchor chains 6; the three supporting columns are arranged at equal intervals to form an equilateral triangle, and the three supporting columns are respectively an upwind supporting column 1 and two downwind supporting columns 2, and the two downwind supporting columns 2 are connected by a truss structure; the bottom end of the upwind supporting column 1 is moored to the seabed by multiple anchor chains 6, realizing a single-point mooring design. Through the single-point mooring, the floating structure can rotate with the wind direction to achieve passive yaw, and the floating wind turbine can be fixed in a certain sea area, without Produce larger lateral, longitudinal and yaw movements; the two intermediate columns 3 are respectively arranged between the upwind support column 1 and the two downwind support columns 2, and each intermediate column 3 is connected to the adjacent upwind support column 1 and downwind support column 2 through a truss structure, which is used to support the upwind tower 4; the bottom ends of the two upwind towers 4 are respectively connected to the top ends of the two intermediate columns 3, and the bottom ends of the two downwind towers 5 are respectively connected to the top ends of the two downwind support columns 2, and the top ends of the two upwind towers 4 and the two downwind towers 5 intersect at one point and are connected, and the wind turbine superstructure is jointly supported by the four towers to disperse the load transmitted to the tower from the wind turbine superstructure.

[0022] Specifically, the supporting columns and the intermediate columns 3 are all installed vertically without an inclination angle, which can effectively reduce the wave load on the columns and increase the stability of the floating body.

[0023] The support columns are dumbbell-shaped, wide at both ends and narrow in the middle. They consist of a lower large-diameter section, a lower variable-section section, a middle small-diameter section, an upper variable-section section, and an upper large-diameter section, all connected in sequence. The smaller diameter of the support columns within the wave range allows them to withstand only small wave loads. The larger diameters at both ends provide greater stability. The wider cross-section of the upper columns in the inclined floating structure provides greater buoyancy reserve and thus greater stability.

[0024] The lower large-diameter section has a diameter of 18 meters and a height of 8 meters. The lower variable-section section has a diameter that varies linearly from 18 meters to 14 meters and a height of 3 meters. The middle small-diameter section has a diameter of 14 meters and a height of 14 meters. The upper variable-section section has a diameter that varies linearly from 14 meters to 18 meters and a height of 3 meters. The upper large-diameter section has a diameter of 18 meters and a height of 5 meters. Ballast tanks are located below the support columns to provide overall ballast for the semi-submersible floating wind turbine.

[0025] The middle column 3 is in the shape of a straight cylinder, with a diameter of 14m and a height of 35m.

[0026] The truss structure includes two horizontal struts 7 parallel to each other and a diagonal strut 8 arranged between the two horizontal struts 7. The horizontal struts 7 are used between the downwind support columns 2, the upwind support columns and the middle columns 3 to transmit wind loads such as the bending moment of the entire wind turbine. At the same time, the diagonal struts 8 are used to transmit force between the horizontal struts 7, so that the unbalanced load transmitted from the entire wind turbine is effectively dispersed.

[0027] This utility model provides buoyancy for the entire wind turbine using three support columns and a central column. The structural draft can be controlled at approximately 20 meters. The distance between the two downwind support columns is 120 meters, and the distance between the two downwind support columns and the upwind support column is also 120 meters. This larger span effectively increases the foundation's moment of inertia, keeping the pitch and roll amplitudes within the safe range for the entire floating wind turbine. The downwind and upwind support columns provide a transmission path for the combined bending moment at the bottom of the wind turbine tower. Finally, horizontal and diagonal braces allow the entire structure to dissipate the unbalanced load transmitted from the wind turbine. Ballast tanks located below the downwind and upwind support columns provide overall ballast for the semi-submersible floating wind turbine, lowering the turbine's overall center of gravity, increasing its GM value, and improving overall stability. This provides sufficient restoring torque under adverse wind, wave, and current conditions, ensuring the unit does not capsize.

[0028] The above is only a preferred embodiment of the present utility model patent, but the protection scope of the present utility model patent is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present utility model patent based on the technical solution and the utility model patent concept of the present utility model patent, which falls within the protection scope of the present utility model patent.

Claims

1. A semi-submersible floating wind turbine foundation, characterized by: The gantry crane comprises three supporting columns, two intermediate columns, a truss structure, two upwind towers, two downwind towers and multiple anchor chains. The three supporting columns are arranged at equal intervals to form an equilateral triangle. The three supporting columns are an upwind supporting column and two downwind supporting columns, and the two downwind supporting columns are connected by a truss structure. The bottom ends of the upwind supporting columns are moored to the seabed by multiple anchor chains. The two intermediate columns are respectively arranged between the upwind supporting columns and the two downwind supporting columns, and each intermediate column is connected to the adjacent upwind supporting columns and downwind supporting columns by a truss structure. The bottom ends of the two upwind towers are respectively connected to the top ends of the two intermediate columns, and the bottom ends of the two downwind towers are respectively connected to the top ends of the two downwind support columns. The tops of the two upwind towers and the two downwind towers intersect at one point and are connected.

2. The semi-submersible floating wind turbine foundation according to claim 1, characterized in that: The supporting column is in a dumbbell-shaped structure with wide ends and narrow middle.

3. The semi-submersible floating wind turbine foundation according to claim 2, characterized in that: The supporting column consists of a lower large diameter section, a lower variable cross-section section, a middle small diameter section, an upper variable cross-section section and an upper large diameter section which are connected in sequence.

4. The semi-submersible floating wind turbine foundation according to claim 3, characterized in that: The diameter of the lower large diameter section is 18m and the height is 8m. The diameter of the lower variable cross-section section changes linearly from 18m to 14m from bottom to top, and the height is 3m. The diameter of the middle small diameter section is 14m and the height is 14m. The diameter of the upper variable cross-section section changes linearly from 14m to 18m from bottom to top, and the height is 3m. The diameter of the upper large diameter section is 18m and the height is 5m.

5. The semi-submersible floating wind turbine foundation according to claim 1, characterized in that: The middle column is in a straight cylindrical shape.

6. The semi-submersible floating wind turbine foundation according to claim 5, characterized in that: The diameter of the middle column is 14m and the height is 35m.

7. The semi-submersible floating wind turbine foundation according to claim 1, characterized in that: The truss structure includes two horizontal braces parallel to each other and a diagonal brace arranged between the two horizontal braces.

8. The semi-submersible floating wind turbine foundation according to claim 1, characterized in that: A ballast tank for providing overall ballast for the semi-submersible floating wind turbine is provided at the lower portion of the supporting column.

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