Semi-submersible floating wind power foundation

Abstract

The application belongs to the technical field of offshore wind power foundation, and provides a semi-submersible floating wind power foundation, which comprises a central column, the top of the central column is used for fixedly connecting a wind turbine tower, the bottom of the central column is fixedly connected with a ballast tank, three groups of side columns are arranged on the outer side of the central column, the distance between the three groups of side columns and the central column is the same and the three groups of side columns are equally spaced on the outer side of the central column; a space truss connection system comprises three groups of connecting beam members for connecting two adjacent side columns and three groups of closed space truss structures for connecting the side columns and the central column. The application solves the technical problems of uneven force bearing, high fatigue risk of the existing triangular layout semi-submersible foundation caused by the wind turbine offset, large structure weight and high construction cost caused by the dependence on large and heavy components, and achieves balanced transmission of the floating foundation load, improves the overall structure safety and hydrodynamic performance, and reduces material consumption and construction cost through the innovative structure layout and connection mode.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power foundation technology, and particularly relates to a semi-submersible floating wind power foundation. Background Technology

[0002] Wind energy, as a clean and renewable energy source, plays a vital role in the global energy structure transformation. Statistics show that over 80% of the world's offshore wind energy resources are located in deep-sea areas with depths exceeding 60 meters. As wind power development in near-shore and shallow-sea areas becomes increasingly saturated, the expansion of the offshore wind power industry into deep-sea areas has become an inevitable trend. Simultaneously, to improve power generation efficiency and economic benefits, the single-unit capacity of wind turbines is also trending towards larger sizes, such as 10MW, 15MW, or even higher.

[0003] When the water depth exceeds approximately 50-60 meters, traditional fixed wind turbine foundations, such as monopiles and jacket structures, become unsuitable due to a sharp decline in economic viability. Floating wind power technology has thus become crucial for developing deep-sea wind energy. Currently, the mainstream types of floating wind turbine foundations include semi-submersible, monopile, tension leg, and barge types. Among these, semi-submersible platforms have become a widely used form in commercial applications due to their good stability, relatively low construction difficulty, and adaptability to complex seabeds.

[0004] However, existing semi-submersible floating wind turbine foundations still have several significant problems. Currently, commercially operational semi-submersible foundations often employ a triangular layout (three columns) with the wind turbine mounted on one of the columns. This offset layout results in a severely uneven distribution of the gravity load and buoyancy force borne by the wind turbine across the three columns. To maintain the platform's overall horizontal attitude under still water and wave loads, ensuring the normal operation of the wind turbine, a complex and large-scale ballast system is required for balancing. This not only increases the system's complexity and cost but also generates enormous unbalanced bending moments and shear forces within the platform structure (especially in connecting components), leading to stress concentration. To withstand these loads, traditional designs have to increase the size and wall thickness of major structural components, such as columns and connecting beams, resulting in a high overall platform weight, large material usage, and high construction costs. Furthermore, under long-term cyclic loads from wind, waves, and currents, this unevenly stressed structure is more prone to fatigue damage, threatening long-term operational safety.

[0005] In addition, a few designs that attempt to place the wind turbine in the center often use a large box girder as the main structure connecting the three columns. While this large box girder provides a certain degree of rigidity, its enormous weight, complex manufacturing process, and large amount of welding work also increase costs, and its hydrodynamic performance still has room for improvement.

[0006] Therefore, there is an urgent need for a semi-submersible floating wind power foundation that can fundamentally improve the stress distribution of the structure, reduce the internal forces of the structure, and effectively reduce the amount of structural materials used while ensuring or even improving safety and motion performance, thereby significantly reducing the levelized cost of energy for deep-sea wind power. Summary of the Invention

[0007] The purpose of this invention is to provide a semi-submersible floating wind power foundation to solve the technical problems of uneven structural stress and high fatigue risk caused by wind turbine offset in existing triangular layout semi-submersible foundations, as well as large structural weight and high construction cost due to reliance on large and heavy components. Through innovative structural layout and connection method, the floating foundation load is evenly transferred, improving the overall structural safety and hydrodynamic performance, and reducing material consumption and construction costs.

[0008] To achieve the above objectives, the present invention provides the following solution: a semi-submersible floating wind turbine foundation, comprising: The central column has a top for fixed connection to the wind turbine tower, a bottom for fixed connection to the ballast tank, and three sets of side columns on the outside of the central column. The three sets of side columns are equidistant from the central column and are distributed at equal intervals on the outside of the central column. The space truss connection system includes three sets of connecting beams for connecting two adjacent side columns and three sets of closed space truss structures for connecting the side columns and the central column.

[0009] Preferably, the enclosed space truss structure includes three sets of bottom horizontal struts, one end of each set of bottom horizontal struts is fixedly connected at equal intervals to the circumferential sidewall of the ballast tank, and the other end of each set of bottom horizontal struts is fixedly connected to the three sets of connecting beam members respectively. The enclosed space truss structure also includes three sets of upper connection units, which are fixedly connected between the central column and the three sets of side columns.

[0010] Preferably, the upper connecting unit includes a side column diagonal brace, a side column horizontal brace, a central column diagonal brace, and an upper diagonal brace. One end of the side column diagonal brace is fixedly connected to the bottom of the side wall of the side column, one end of the side column horizontal brace is fixedly connected to the top of the side wall of the side column, one end of the central column diagonal brace is fixedly connected to the bottom of the side wall of the central column, and one end of the upper diagonal brace is fixedly connected to the top of the side wall of the central column. The other ends of the side column diagonal brace, the side column horizontal brace, the central column diagonal brace, and the upper diagonal brace are fixedly connected to each other and intersect to form a connection node.

[0011] Preferably, it also includes three sets of upper horizontal support rods, the two ends of which are fixedly connected to two adjacent connection nodes respectively.

[0012] Preferably, the connecting beam member includes a side column connecting beam, which is horizontally arranged, and both ends of the side column connecting beam are fixedly connected to the bottom of the side walls of the two side columns respectively. The end of the bottom horizontal support rod away from the ballast tank is fixedly connected to the side column connecting beam.

[0013] Preferably, a sway plate is fixedly connected to the bottom of the side wall of the side column, and the sway plate is fixedly connected between the side column and the connecting beam of the two side columns.

[0014] Preferably, the sway plate is located below the side column diagonal brace.

[0015] Preferably, the ballast tank is cylindrical and is coaxial with the central column, and the diameter of the ballast tank is larger than the diameter of the central column.

[0016] Preferably, the side pillars are made of lightweight composite materials.

[0017] Preferably, the ballast tank contains ballast material for adjusting the draft of the central column.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects: 1. This invention creatively places the largest concentrated load of the wind turbine, the wind turbine itself, on the core column at the geometric center by setting up a four-column layout of "three side columns + a central column". The three side columns mainly provide buoyancy and bear environmental loads, and their stress is symmetrical with respect to the center, fundamentally eliminating the serious uneven bending moment and shear force problems caused by the traditional three-column offset design. Combined with an efficient space truss connection system, the load is evenly and smoothly transferred to the entire foundation, greatly reducing stress concentration at key connection points, improving structural fatigue life, and significantly enhancing overall safety.

[0019] 2. The enclosed space truss structure provided by this invention is a structural form with extremely high mechanical efficiency, capable of bearing large loads with a small material cross-section. Compared to traditional large solid box beams or thickened plate structures, the truss structure of this invention uses less material and is lighter in weight. The reduction in material usage directly leads to a significant decrease in construction costs. At the same time, the relatively simple truss structure facilitates standardized production and on-site installation, further saving time and costs.

[0020] 3. This invention, through a specially designed heave plate at the bottom of the side pillars and an additional heave plate formed by the ballast tank's own structure, constitutes a highly efficient heave motion suppression system. This effectively increases the platform's heave damping and added mass, thereby increasing its natural heave motion period. This helps avoid the dominant wave frequency of common sea states, significantly reducing the platform's motion amplitude in waves, providing a more stable working environment for the wind turbine, and improving power generation efficiency and turbine lifespan.

[0021] 4. This invention, by configuring a ballast tank at the bottom of the central pillar, significantly lowers the platform's overall center of gravity, increases the restoring moment, and enhances the platform's stability. This design makes the foundation suitable not only for deep-water areas but also, due to its excellent stability and adjustable draft, for shallow and medium-depth waters, thus broadening its application range. Its superior motion performance enables it to support larger capacity wind turbine units, aligning with the trend towards larger wind turbines. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram showing the connection between the wind power foundation and the wind turbine tower of the present invention; Figure 2 This is a schematic diagram of the wind power foundation of the present invention; Among them, 1. Central column; 10. Side column; 20. Heave plate; 30. Side column connecting beam; 40. Ballast tank; 50. Bottom horizontal strut; 60. Side column diagonal strut; 70. Side column horizontal strut; 80. Central column diagonal strut; 90. Upper diagonal strut; 100. Upper horizontal strut; 110. Connection node. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1: Reference Figures 1-2 This invention provides a semi-submersible floating wind turbine foundation, comprising: The central column 1 has a top that is fixedly connected to the wind turbine tower, and a ballast tank 40 is fixedly connected to the bottom of the central column 1. Three sets of side columns 10 are provided on the outside of the central column 1. The three sets of side columns 10 are at the same distance from the central column 1 and are distributed at equal intervals on the outside of the central column 1. The spatial truss connection system includes three sets of connecting beam members for connecting two adjacent side columns 10 and three sets of closed spatial truss structures for connecting the side columns 10 and the central column 1.

[0027] The three sets of side columns 10 are distributed in an equilateral triangle on the horizontal projection plane, forming the basic support points of the platform. The central column 1 is located at the geometric center of the equilateral triangle formed by the three sets of side columns 10. The wind turbine tower is fixedly connected to the top of the central column 1, realizing the central load-bearing of the wind turbine. The main function of the three sets of connecting beams is to connect the three sets of side columns 10 in sequence, thereby connecting the three side columns 10 into a stable triangular bottom frame. The main function of the closed space truss structure is to rigidly connect the central column 1 and the three side columns 10 in three-dimensional space, forming a high-rigidity and high-stability closed space truss structure, which can significantly reduce the overall weight and manufacturing cost while meeting the strength requirements of the wind power foundation.

[0028] Overall, this invention employs a four-column layout with three side columns and a central column, placing the largest concentrated load—the wind turbine—on the core column at the geometric center. The three side columns provide buoyancy and bear environmental loads, resulting in symmetrical stress distribution relative to the center. This fundamentally eliminates the severe uneven bending moment and shear force problems caused by the traditional three-column offset design. Combined with an efficient space truss connection system, the load is evenly and smoothly transferred to the entire foundation, significantly reducing stress concentration at critical connection points, improving structural fatigue life, and substantially enhancing overall safety. Furthermore, the closed space truss structure provided by this invention is a highly efficient structural form, capable of withstanding large loads with a smaller material cross-section. Compared to traditional large solid box beams or thickened plate structures, the rod structure of this invention uses less material and is lighter. This reduction in material usage directly leads to a significant decrease in construction costs. Simultaneously, the relatively simple rod structure facilitates standardized production and on-site installation, further saving time and costs.

[0029] Further optimization of the design: a flange structure (not shown in the figure) is fixedly connected to the top of the central column 1, and the flange interface is used to install the wind turbine tower.

[0030] The scheme was further optimized. The enclosed space truss structure includes three sets of bottom horizontal struts 50. One end of the three sets of bottom horizontal struts 50 is fixedly connected at equal intervals to the circumferential side wall of the ballast tank 40. The other end of the three sets of bottom horizontal struts 50 is fixedly connected to three sets of connecting beam members respectively. The enclosed space truss structure also includes three sets of upper connection units, which are fixedly connected between the central column 1 and the three sets of side columns 10.

[0031] like Figure 2 As shown, in this embodiment, three sets of bottom horizontal struts 50 are radially distributed on the circumferential sidewalls of the ballast tank 40, which firmly connect the triangular bottom frame formed by the three sets of connecting beam members and the three sets of side columns 10 to the ballast tank 40 at the bottom of the central column 1, thereby transferring the load and enhancing the overall integrity of the bottom structure.

[0032] Further optimization of the design: the bottom horizontal support rod 50 can be connected to the side wall of the ballast tank 40 or to the top or bottom of the ballast tank 40.

[0033] The scheme is further optimized. The upper connection unit includes a side column diagonal brace 60, a side column horizontal brace 70, a central column diagonal brace 80, and an upper diagonal brace 90. One end of the side column diagonal brace 60 is fixedly connected to the bottom of the side wall of the side column 10, one end of the side column horizontal brace 70 is fixedly connected to the top of the side wall of the side column 10, one end of the central column diagonal brace 80 is fixedly connected to the bottom of the side wall of the central column 1, and one end of the upper diagonal brace 90 is fixedly connected to the top of the side wall of the central column 1. The other ends of the side column diagonal brace 60, the side column horizontal brace 70, the central column diagonal brace 80, and the upper diagonal brace 90 are fixedly connected to each other and intersect to form a connection node 110.

[0034] like Figure 2 As shown, in this embodiment, the three sets of upper connecting units connect a set of side columns 10 and a central column 1. Specifically, one end of the side column diagonal brace 60 is fixedly connected to the lower part of the side wall of the side column 10 and extends obliquely upward toward the central column 1; one end of the side column horizontal brace 70 is fixedly connected to the upper part of the side wall of the side column 10 and extends horizontally or approximately horizontally toward the central column 1; one end of the central column diagonal brace 80 is fixedly connected to the lower part of the side wall of the central column 1 and extends obliquely upward toward the side column 10; and one end of the upper diagonal brace 90 is fixedly connected to the upper part of the side wall of the central column 1 and extends obliquely downward toward the side column 10. The connecting node 110 formed by the intersection of the side column diagonal brace 60, the side column horizontal brace 70, the central column diagonal brace 80, and the upper diagonal brace 90 is located in the upper middle part of the central column 1.

[0035] Further optimization of the scheme also includes three sets of upper horizontal support rods 100, with the two ends of the upper horizontal support rods 100 being fixedly connected to two adjacent connection nodes 110 respectively.

[0036] like Figure 2 As shown, in this embodiment, three additional sets of upper horizontal support rods 100 are provided. The three sets of upper horizontal support rods 100 are sequentially connected to three sets of connecting nodes 110. That is, the three connecting nodes 110 are connected in pairs through the three upper horizontal support rods 100 to form a triangular horizontal reinforcing ring located on the upper part of the platform, which further increases the integrity and structural strength.

[0037] The scheme is further optimized. The connecting beam includes a side column connecting beam 30, which is set horizontally. Both ends of the side column connecting beam 30 are fixedly connected to the bottom of the side wall of the two side columns 10 respectively. The bottom horizontal support rod 50 is fixedly connected to the side column connecting beam 30 at one end away from the ballast tank 40.

[0038] like Figure 2 As shown, the two ends of the three sets of side column connecting beams 30 connect the three sets of side columns 10 in pairs, forming an equilateral triangular bottom frame. The ends of the three sets of bottom horizontal struts 50 away from the ballast tank 40 are all fixedly connected to the middle of the three sets of side column connecting beams 30, realizing the radial distribution of the three sets of bottom horizontal struts 50. This structural setting strengthens the connection between the formed equilateral triangular bottom frame and the central structure, that is, the connection with the central column 1 and the ballast tank 40, and improves the overall structural strength.

[0039] In this embodiment, a triangular structure is formed between the side column diagonal brace 60, the side column horizontal brace 70, and the side column 10; a triangular structure is formed between the central column diagonal brace 80, the upper diagonal brace 90, and the central column 1; and a triangular structure is formed between the three sets of upper horizontal braces 100 and the three sets of connecting nodes 110. Through the triangular structures formed by the various braces, a three-dimensional, highly statically indeterminate closed spatial truss is formed. This structure has extremely high stiffness and strength-to-weight ratio, making the closed spatial truss structure have a more reasonable stress structure. While meeting the structural strength requirements during use, it can effectively reduce the diameter of the side column diagonal brace 60, the side column horizontal brace 70, the central column diagonal brace 80, the upper diagonal brace 90, and the upper horizontal brace 100, further reducing the overall weight. Compared with traditional large solid box beams or thickened plate structures, the rod structure of this invention has greater weight and cost advantages.

[0040] In a further optimized design, a sway plate 20 is fixedly connected to the bottom of the side wall of the side column 10, and the sway plate 20 is fixedly connected between the side column 10 and the connecting beam 30 of the two side columns.

[0041] The design was further optimized so that the sway plate 20 is located below the diagonal brace 60 of the side column.

[0042] like Figure 2 As shown, in this embodiment, two sets of side column connecting beams 30 converge at the bottom of the side wall of one side column 10. The heave plate 20 is triangular and has a horizontal or slightly inclined flat plate structure. Its two sides are welded to the side column connecting beams 30, and the top of the heave plate 20 is welded to the intersection of the side column 10 and the two sets of side column connecting beams 30. The heave plate 20 can significantly increase the added mass and damping of the wind turbine foundation in the heave direction, effectively suppress the heave motion of the wind turbine foundation, increase the natural period of the heave motion, and keep it away from the common wave energy concentration period, thereby improving the motion response performance of the platform in waves.

[0043] The design was further optimized by setting the ballast tank 40 as a cylinder, and setting the ballast tank 40 and the central column 1 on the same axis. The diameter of the ballast tank 40 is larger than the diameter of the central column 1.

[0044] like Figure 2 As shown, in this embodiment, the diameter of the ballast tank 40 is designed to be larger than the diameter of the bottom of the central column 1. This causes the bottom plate or the outer edge of the side plate of the ballast tank 40 to extend outward relative to the central column 1. The ballast tank 40 forms an effective additional heave plate structure at the bottom of the central column 1 through its own structure, which further enhances the ability of the wind power foundation of the present invention to suppress heave motion.

[0045] The design was further optimized by adding ballast material inside the ballast tank 40 to adjust the draft of the central column 1.

[0046] like Figure 2 As shown, in this embodiment, the ballast tank 40 is equipped with ballast material. In this embodiment, seawater can be filled or ballast iron can be placed. Its core functions are twofold: first, to precisely control the draft of the wind power foundation by adjusting the ballast amount so that it reaches the predetermined working waterline; second, to reduce the overall center of gravity of the platform by utilizing the principle of low center of gravity, thereby significantly improving the initial stability and motion stability of the platform.

[0047] Specifically, in this embodiment, the ballast tank 40 has an internal cavity. Seawater can be injected into the cavity through a piping system to increase the ballast weight of the ballast tank 40. Alternatively, a hatch can be opened on the side wall of the ballast tank 40 to connect to the internal cavity, and solid ballast blocks can be placed into the internal cavity through the hatch to increase the ballast weight of the ballast tank 40.

[0048] Further optimization of the design resulted in the side pillar 10 being made of lightweight composite materials.

[0049] In this embodiment, the side column 10 can be made of fiberglass FRP, carbon fiber composite materials, etc., to replace the traditional all-steel structure, further reduce the upper weight of the wind power foundation, optimize the load distribution, and at the same time, the composite material has good corrosion resistance and is more suitable for the working environment on the sea surface.

[0050] The manufacturing and use process of the wind power foundation in this embodiment is as follows: In the actual construction, the central column 1, ballast tank 40, side column connecting beam 30, bottom horizontal support rod 50, side column diagonal support rod 60, side column horizontal support rod 70, central column diagonal support rod 80, upper diagonal support rod 90, and upper horizontal support rod 100 can be made of high-strength steel.

[0051] The three sets of side columns 10 are made of lightweight composite materials, such as fiberglass, to reduce weight. Simultaneously, metal connection structures are pre-embedded within the three sets of side columns 10. The central column 1, the central column diagonal brace 80, and the upper diagonal brace 90 are connected by welding. The metal connection structures within the side columns 10 are also connected by welding to the side column connecting beam 30, the side column diagonal brace 60, and the side column horizontal brace 70. The two ends of the bottom horizontal brace 50 are welded to the ballast tank 40 and the side column connecting beam 30, respectively. The connection node 110 is also formed by welding and is connected to the upper horizontal brace 100 by welding.

[0052] After construction, the wind turbine foundation platform reaches its design draft and ensures good stability by adjusting the ballast water volume in the ballast tank 40 or adjusting the weight of the solid ballast blocks placed in the ballast tank 40. Subsequently, the wind turbine is hoisted to the top of the central column 1, and the bottom of the wind turbine tower is fixedly connected to the top of the central column 1, forming a structure as shown in the image. Figure 1 The structure shown is ready for use.

[0053] This invention achieves optimal structural stress through an innovative design of "central load-bearing + spatial truss". While ensuring excellent safety and motion performance, it also saves materials and reduces costs, providing a highly competitive basic solution for the large-scale commercial development of deep-sea wind power.

[0054] Example 2: The only difference between this embodiment and Embodiment 1 is that, in this embodiment, the two ends of the side column connecting beam 30, the bottom horizontal support rod 50, the side column diagonal support rod 60, the side column horizontal support rod 70, the central column diagonal support rod 80, and the upper diagonal support rod 90 are respectively welded with connecting flanges. The bottom and top of the side wall of the side column 10 are respectively pre-embedded with connecting flanges that connect to the side column connecting beam 30, the side column diagonal support rod 60, and the side column horizontal support rod 70 in this embodiment. Simultaneously, a connecting flange is welded to the middle of the side column connecting beam 30 for fixed connection with the bottom horizontal support rod 50, and a connecting flange is welded to the side wall of the ballast tank 40 for fixed connection with the end of the bottom horizontal support rod 50 away from the side column connecting beam 30.

[0055] In this embodiment, the side column connecting beam 30, bottom horizontal support rod 50, side column diagonal support rod 60, side column horizontal support rod 70, center column diagonal support rod 80, and upper diagonal support rod 90 are connected to the side column 10, center column 1, and ballast tank 40 through a flange structure, which improves the ease of disassembly and assembly and maintainability of the wind power platform, and supports on-site installation and launching. Compared with overall transportation, it effectively reduces transportation costs.

[0056] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to 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 this invention.

[0057] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A semi-submersible floating wind turbine foundation, characterized in that, include: A central column (1) is provided. The top of the central column (1) is used to fix and connect the wind turbine tower. A ballast tank (40) is fixedly connected to the bottom of the central column (1). Three sets of side columns (10) are provided on the outside of the central column (1). The three sets of side columns (10) are at the same distance from the central column (1) and are distributed at equal intervals on the outside of the central column (1). The space truss connection system includes three sets of connecting beam members for connecting two adjacent side columns (10) and three sets of closed space truss structures for connecting the side columns (10) and the central column (1).

2. The semi-submersible floating wind turbine foundation according to claim 1, characterized in that: The enclosed space truss structure includes three sets of bottom horizontal struts (50). One end of each of the three sets of bottom horizontal struts (50) is fixedly connected at equal intervals to the circumferential sidewall of the ballast tank (40), and the other end of each of the three sets of bottom horizontal struts (50) is fixedly connected to the three sets of connecting beam members respectively. The enclosed space truss structure also includes three sets of upper connection units, which are fixedly connected between the central column (1) and the three sets of side columns (10).

3. A semi-submersible floating wind turbine foundation according to claim 2, characterized in that: The upper connecting unit includes a side column diagonal brace (60), a side column horizontal brace (70), a central column diagonal brace (80), and an upper diagonal brace (90). One end of the side column diagonal brace (60) is fixedly connected to the bottom of the side wall of the side column (10), one end of the side column horizontal brace (70) is fixedly connected to the top of the side wall of the side column (10), one end of the central column diagonal brace (80) is fixedly connected to the bottom of the side wall of the central column (1), and one end of the upper diagonal brace (90) is fixedly connected to the top of the side wall of the central column (1). The other ends of the side column diagonal brace (60), the side column horizontal brace (70), the central column diagonal brace (80), and the upper diagonal brace (90) are fixedly connected to each other and intersect to form a connecting node (110).

4. A semi-submersible floating wind turbine foundation according to claim 3, characterized in that: It also includes three sets of upper horizontal support rods (100), the two ends of which are fixedly connected to two adjacent connection nodes (110).

5. A semi-submersible floating wind turbine foundation according to claim 3, characterized in that: The connecting beam member includes a side column connecting beam (30), which is horizontally arranged, and both ends of the side column connecting beam (30) are fixedly connected to the bottom of the side wall of the two side columns (10), and the bottom horizontal support rod (50) is fixedly connected to the side column connecting beam (30) at one end away from the ballast tank (40).

6. A semi-submersible floating wind turbine foundation according to claim 5, characterized in that: A sway plate (20) is fixedly connected to the bottom of the side wall of the side column (10), and the sway plate (20) is fixedly connected between the side column (10) and the two side column connecting beams (30).

7. A semi-submersible floating wind turbine foundation according to claim 6, characterized in that: The sway plate (20) is located below the side column diagonal brace (60).

8. A semi-submersible floating wind turbine foundation according to claim 1, characterized in that: The ballast tank (40) is configured as a cylinder, and the ballast tank (40) is coaxially arranged with the central column (1). The diameter of the ballast tank (40) is larger than the diameter of the central column (1).

9. A semi-submersible floating wind turbine foundation according to claim 1, characterized in that: The side post (10) is made of lightweight composite material.

10. A semi-submersible floating wind turbine foundation according to claim 1, characterized in that: The ballast tank (40) contains ballast material for adjusting the draft of the central column (1).

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