Semi-submersible floating type wind power foundation

Abstract

The invention relates to a semi-submersible floating type wind power foundation which comprises a plurality of independent floating bodies which are connected with one another to form a foundation floating body of a polygonal structure. A through opening used for connection is formed in the connecting position of every two adjacent floating bodies, and a welding area of each connecting position is located above the corresponding through opening. A plurality of stand columns are installed on the foundation floating body. According to the wind power foundation and the corresponding closure scheme thereof, the single floating body has enough buoyancy and stability, the resistance is small when the floating body floats on the water surface, and the floating body is easy to move and position; a plurality of floating bodies are arranged on the stand column, a through opening used for connection is formed in the connecting position of every two adjacent floating bodies, welding areas of the connecting positions are located above the through openings, it is ensured that the welding process is completed in a dry environment, the welding quality and precision are guaranteed, the floating bodies and the stand column do not need to be independently folded and then subjected to underwater operation in the water folding process, and the welding efficiency is improved. The folding process is simplified, the applicability is further improved, and the production cost is effectively controlled.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a semi-submersible floating wind power foundation. Background Art

[0002] With the development of wind power technology, offshore wind power technology has become an important part of the renewable energy field. Among them, semi-submersible floating wind power foundation, as a technical solution suitable for deep-water areas, has gradually shown its unique advantages. This foundation form supports wind turbines through multiple buoys or columns, allowing them to remain stable on the water surface, thereby allowing wind power equipment to be installed in sea areas where the water depth exceeds the applicable depth of fixed foundations. This design not only broadens the scope of application of offshore wind power, but also makes better use of the richer wind resources in deep-sea areas.

[0003] However, in the construction process of semi-submersible wind power foundations, the segmented closure technology of floating bodies and marine structures has become a key problem. Especially when the foundation scale is large, the traditional dock-mounted closure method often cannot meet the needs. The dock-mounted method requires that different structural segments be fixed in appropriate positions in the dock for closure, and then water is poured to make the floating body float, and then towed to the dock for subsequent processes. However, for floating bodies with large scale and similar length-to-width ratio, this method is difficult to implement in the dock.

[0004] In the related technology, the closure is carried out on a flat ground with sufficient strength, and then the SPMT (axis vehicle) or crane is used to control the position and closure accuracy of the segments, and finally the SPMT or slide rail is used to move it to the semi-submersible ship for launching. However, this method still requires a large site for ultra-large floating wind power foundations, and the launching operation is complicated and costly. Alternatively, the closure is carried out directly on a semi-submersible barge or ship, and after the closure, the semi-submersible ship dives to launch the floating body. Although this method solves the site problem to a certain extent, it still faces the challenges of stability and displacement for ultra-large foundations. Especially when building floating wind power foundations of 15MW and above, the scale has reached more than 100m, and the existing docks and semi-submersible barges are often difficult to meet the needs.

[0005] The above-mentioned onshore closing method has the problem of limited closing space and difficulty in launching after closing. The closing of large semi-submersible barges has the problem of insufficient deck area and high cost. If the floating bodies to be closed are closed directly on the water, there are generally problems such as insufficient displacement, insufficient stability of the floating bodies, inability to provide a dry environment for welding, and large relative movement between the closing floating bodies, making it difficult to meet the construction accuracy. Summary of the invention

[0006] Based on this, it is necessary to provide a semi-submersible floating wind power foundation to address the problems of insufficient stability of the floating body, inability of the displacement to meet the demand, and limited size of the floating body.

[0007] A semi-submersible floating wind power foundation, comprising:

[0008] A plurality of independent floating bodies, wherein the plurality of floating bodies are connected to each other to form a basic floating body with a polygonal structure or a star-shaped structure;

[0009] A through hole for connection is provided between the connection points of two adjacent floating bodies, and the welding area of ​​the connection point is located above the through hole;

[0010] A plurality of columns are installed on the base float.

[0011] In one embodiment, the floating body comprises:

[0012] The main body is a longitudinal structure;

[0013] Connecting parts, respectively arranged at two ends of the main body in the longitudinal direction;

[0014] The plurality of floating bodies are connected and fixed to each other via a plurality of connecting parts, and the columns are installed on the connecting parts.

[0015] In one embodiment, the through opening is formed at the bottom of the two connected connection parts, and the through opening passes through the connection parts.

[0016] In one embodiment, the through opening is at least partially exposed above the water plane where the floating body is located.

[0017] In one embodiment, the cross section of the through opening is a chamfered arc surface, and the welding seam on the arc surface is higher than the waterline where the floating body is located.

[0018] In one embodiment, the connecting portion comprises:

[0019] A connecting surface, arranged on one side of the connecting portion;

[0020] The connecting surfaces of two adjacent connecting parts are fixed by welding.

[0021] In one embodiment, the welding area includes a vertical welding area;

[0022] Two adjacent connection surfaces are fitted together to form the vertical welding area, and the lowest point of the vertical welding area is higher than the highest point of the through-hole.

[0023] In one embodiment, the connecting portion comprises:

[0024] A support surface, arranged on the upper side of the connecting portion;

[0025] The bottom end of the column is mounted on the supporting surface.

[0026] In one embodiment, the welding region includes a transverse welding region;

[0027] The bottom surface of the column is fitted with the supporting surface to form the transverse welding area, and the height of the plane where the transverse welding area is located is higher than the height of the waterline where one end of the through opening close to the transverse welding area is located.

[0028] In one embodiment, two adjacent connection portions are connected to form a polygonal shape; and the width of the bottom surface of the column is less than or equal to the width of the polygonal shape.

[0029] In the above-mentioned semi-submerged floating wind power foundation and its corresponding closing scheme, a single floating body has sufficient buoyancy and stability. A single floating body is on the water surface with low resistance, and it is easy to move and position it with a small winch. In addition, by providing a through hole for connection between the connection points of two adjacent floating bodies, the welding area of ​​the connection point can be located above the through hole, ensuring that the welding process is completed in a dry environment, ensuring the welding quality and accuracy, thereby realizing the water closing process of multiple floating bodies and columns, without the need for separate closing and launching operations, effectively simplifying the closing process of floating bodies and columns, further improving applicability, and effectively controlling production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 is a structural schematic diagram of a floating body.

[0031] FIG. 2 is a second structural schematic diagram of a floating body.

[0032] FIG. 3 is a schematic structural diagram of a column.

[0033] FIG4 is a schematic diagram of the structure of a wind power foundation.

[0034] FIG5 is a schematic diagram of a partial cross section of a wind power foundation.

[0035] FIG. 6 is a first schematic structural diagram of another floating body.

[0036] FIG. 7 is a second structural schematic diagram of another floating body.

[0037] FIG. 8 is a schematic structural diagram of another column.

[0038] FIG. 9 is a schematic structural diagram of another wind power foundation.

[0039] In the figure: 1, floating body; 10, through-hole; 20, welding area; 21, vertical welding area; 22, horizontal welding area; 30, main body; 40, connecting part; 41, connecting surface; 42, supporting surface;

[0040] 2. Column;

[0041] 3. Waterline surface. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0043] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0044] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0046] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0048] Referring to Figures 1 to 5, Figures 1 to 5 are respectively schematic diagrams of the overall structure of a wind power foundation in an embodiment of the present application and schematic diagrams of the structure of each component. An embodiment of the present application provides a semi-submerged floating wind power foundation, including a float 1 and a column 2.

[0049] A plurality of independent floating bodies 1 are interconnected to form a basic floating body with a polygonal structure or a star structure.

[0050] Specifically, the buoy 1 is made of high-strength, corrosion-resistant steel or composite materials to ensure sufficient strength and durability in harsh marine environments.

[0051] In this embodiment, a single buoy 1 has sufficient stability and displacement, so that the single buoy 1 can float above the water surface before connection, and the empty ship draft is shallow. The two buoys 1 are connected by welding or flange bolts. In addition, the outer plate of the end of the buoy 1 near the connection interface seam between the two buoys 1 is de-slanted, so that when the two buoys 1 are connected, the connection interface seam can be located above the temporary waterline 3, ensuring that the welding or bolt connection operation is carried out in a dry environment.

[0052] Before connecting two floating bodies 1, a winch is used to pull the two floating bodies 1 together, and the two floating bodies 1 are accurately docked through the slot limiter.

[0053] 2 is a schematic diagram of the structure of a floating body 1 in an embodiment of the present application. In some embodiments, a through hole 10 for connection is provided between the joints of two adjacent floating bodies 1, and the welding area 20 of the joint is located above the through hole 10.

[0054] Specifically, a through-hole 10 for connecting operations is provided at the connection between two adjacent buoys 1, so that in the process of connecting the buoys 1, the welding area 20 is cleverly arranged above the through-hole 10, that is, the welding area 20 is located above the waterline plane 3, ensuring a dry environment for welding, thereby ensuring welding quality and further improving stability and durability.

[0055] The through hole 10 passes through the connection seam, and the cross-sectional shape of the through hole 10 can be arc-shaped, rectangular, or other cross-sectional forms. The opening area of ​​the through hole 10 is sufficient to allow operators to take a suitable vessel to the through hole 10 for pretreatment and inspection during the connection operation. In addition, the base float has a large waterline area, so that when the base float is welded, the connection seam is above the waterline 3, maintaining a dry welding environment.

[0056] After the foundation buoy is connected, a plurality of columns 2 are installed on the foundation buoy. When the columns 2 are installed, the installation joints also need to be above the temporary waterline of the foundation buoy.

[0057] Specifically, the column 2 is made of the same material as the floating body 1 to ensure compatibility therebetween. The cross-sectional shape and size of the column 2 are optimized to ensure that it can withstand the vertical and horizontal loads from the wind power equipment.

[0058] As shown in Figures 1 to 4, Figures 1 to 4 are schematic structural diagrams of a wind power foundation in an embodiment of the present application.

[0059] In a topological form of this embodiment, three floating bodies 1 can be selected to be connected to each other to form a basic unit of a triangular structure, which can effectively disperse the impact of waves and currents on the foundation and improve the overall stability and anti-overturning ability. A column 2 is installed at each point of the triangular structure. These columns 2 not only provide a stable support platform for the wind power equipment, but also further enhance the structural strength and overall stability of the entire foundation through the connection between the columns 2 and the floating body 1.

[0060] 6 to 9 , which are schematic structural diagrams of another wind power foundation in an embodiment of the present application.

[0061] In another topological form of this embodiment, three floating bodies 1 are centrally connected at the same center, and a column 2 is provided at the center, on which the wind turbine is installed. Three side columns 2 are arranged around to form a star-shaped structure. This structural form can more effectively disperse and resist loads from all directions, and improve the overall stability and carrying capacity. In addition, the top is connected by diagonal braces, horizontal braces and other connection forms, which further enhances the stability of the structure, thereby ensuring the safety and reliability of the operation of the wind power equipment.

[0062] As described above, in the above-mentioned semi-submerged floating wind power foundation and its corresponding closing scheme, a through hole 10 for connection is provided between the connection points of two adjacent buoys 1, so that the welding area 20 at the connection point can be located above the through hole 10, ensuring that the welding process is completed in a dry environment, ensuring the welding quality and accuracy, thereby realizing the water closing process of multiple buoys 1 and columns 2, without the need for separate closing and launching operations, effectively simplifying the closing process of the buoys 1 and columns 2, further improving applicability, and effectively controlling production costs.

[0063] 1 is a schematic diagram of the structure of a floating body 1 in an embodiment of the present application. In some embodiments, the floating body 1 includes a main body 30 and a connecting portion 40.

[0064] Specifically, the main body 30 of the floating body 1 is made of high-strength, corrosion-resistant lightweight materials, such as high-strength steel or composite materials. The main body 30 is a longitudinal structure to ensure that the floating body 1 can provide sufficient buoyancy while maintaining structural stability. In this embodiment, the main body 30 of the floating body 1 is designed to be streamlined to reduce water flow resistance and improve the floating performance and durability of the floating body 1.

[0065] Specifically, the connecting parts 40 are respectively arranged at both ends of the main body 30 in the longitudinal direction, and adopt a reinforced structure design to ensure that the load from other floating bodies 1 and columns 2 can be borne. The connecting parts 40 are provided with interfaces for connecting with other floating bodies 1 or columns 2, such as welding surfaces. In this embodiment, the connecting parts 40 are designed to be detachable to facilitate the assembly and disassembly of the floating body 1.

[0066] In the above embodiment, the plurality of floating bodies 1 are connected and fixed to each other through the plurality of connecting parts 40, and the columns 2 are installed on the connecting parts 40. The number and position of the columns 2 are determined according to the weight, size and installation requirements of the wind power equipment. The top or periphery of the column 2 is provided with a flange or other connecting device for installing the wind power equipment.

[0067] In one embodiment, the float 1 is designed in a rectangular or rounded rectangular shape, which can reduce water flow resistance while ensuring sufficient buoyancy, thereby improving the stability and durability of the float in the water. In addition, the float of this shape is easy to manufacture and transport, thereby reducing the manufacturing cost.

[0068] The column 2 adopts a circular or polygonal design, which can optimize the bearing capacity and stability of the structure. The circular column 2 has better wind pressure resistance and torsion resistance, while the polygonal column 2 can reduce the material consumption and manufacturing cost while ensuring the bearing capacity.

[0069] As shown in FIG2 , FIG2 is a schematic diagram of the structure of the floating body 1 in an embodiment of the present application. In some embodiments, the bottom of the two connected connecting parts 40 is provided with the through opening 10 , and the through opening 10 passes through the connecting parts 40 .

[0070] Specifically, the outer plate at the end of the floating body 1 is designed to be tilted so that it is tilted upward above the water surface. The tilt angle and height are determined according to the size, shape and water surface height of the floating body 1, which is equivalent to cutting a through hole 10 at the bottom of the floating body 1 to ensure that the weld line can be completely above the water surface when the two floating bodies 1 are closed.

[0071] As shown in Figure 5, Figure 5 is a partial cross-sectional schematic diagram of a wind power foundation in an embodiment of the present application. In some embodiments, the through opening 10 is at least partially exposed on the water plane 3 where the floating body 1 is located.

[0072] Specifically, the through opening 10 is exposed on the waterplane 3 where the buoy 1 is located, which means that even when the buoy 1 is at the maximum draft, the lower edge of the through opening 10 is still above the water surface, thereby ensuring that the welding area 20 above the through opening 10 is always on the waterplane 3, maintaining a dry welding environment.

[0073] In one embodiment, the cross section of the through opening 10 is a chamfered arc surface, and the welding seam on the arc surface is higher than the water plane 3 where the floating body 1 is located.

[0074] Specifically, according to the characteristics of this embodiment, the through-hole 10 is located in the low stress area of ​​the structure to reduce the stress concentration of the closure seam. At the same time, the cross-sectional shape of the through-hole 10 can be optimized according to the actual situation. For example, the through-hole 10 with a circular arc cross-section can evenly disperse the stress and reduce the stress concentration of the closure seam, thereby improving the stability and durability of the structure. The through-hole 10 with a rectangular cross-section is easier to realize during the construction process and can be completed by simple cutting and welding processes, which reduces the manufacturing cost and is suitable for various floating structures on water.

[0075] In this embodiment, the through hole 10 is located in the low stress area of ​​the structure to avoid structural damage caused by stress concentration. At the same time, according to the on-site sea conditions, the height of the through hole 10 is optimized to be more than 1m away from the water surface, so that when the two bottom buoys 1 are closed, the closing weld is located above the water surface to avoid seawater erosion.

[0076] As shown in FIG1 , FIG1 is a schematic diagram of the structure of a floating body 1 in an embodiment of the present application. In some embodiments, the connecting portion 40 includes a connecting surface 41 .

[0077] Specifically, the connection surface 41 is used to be welded and fixed with the connection surface 41 of the adjacent floating body 1. The connection surface 41 is a flat portion of the connection portion 40, and its size, shape and position are customized according to the size and shape of the floating body 1. The connection surface 41 needs to be large enough to ensure the strength and stability of the welded joint. At the same time, the surface of the connection surface 41 needs to be processed to improve the welding quality and the durability of the joint.

[0078] As shown in FIG4 , FIG4 is a schematic diagram of the structure of a wind power foundation in an embodiment of the present application. In some embodiments, the welding area 20 includes a vertical welding area 21 ; two adjacent connecting surfaces 41 are bonded to form a vertical welding area 21 , and the lowest point of the vertical welding area 21 is higher than the highest point of the through opening 10 .

[0079] Specifically, two adjacent connection surfaces 41 are attached to each other to form a vertical welding area 21. The shape of the area can be rectangular, circular or other shapes suitable for welding. The lowest point of the vertical welding area 21 is higher than the highest point of the through-hole 10, ensuring that the welding area 20 will not be affected by the water flow at the through-hole 10, ensuring the dryness of the welding environment, thereby improving the sealing of the connection and the stability of the structure.

[0080] In combination with Fig. 3 , Fig. 4 is a schematic diagram of the structure of the column 2 in an embodiment of the present application. In some embodiments, the connecting portion 40 includes a supporting surface 42 .

[0081] Specifically, the support surface 42 is provided in a flat area on the upper side of the connection portion 40, and is used to support the bottom end of the column 2. The size, shape and position of the support surface 42 are customized according to the size and installation requirements of the column 2, ensuring that the column 2 can be stably placed on the support surface 42. The bottom end of the column 2 is designed to be a shape matching the support surface 42, the bottom end of the column 2 is placed on the support surface 42, the position and angle of the column 2 are adjusted, the relative position between the column 2 and the connection portion 40 is ensured to meet the requirements, and the column 2 and the connection portion 40 are fixed together by welding, ensuring the strength and durability of the connection structure.

[0082] As shown in FIG4 , FIG4 is a schematic diagram of the structure of a wind power foundation in an embodiment of the present application. In some embodiments, the welding area 20 includes a transverse welding area 22 .

[0083] The bottom surface of the column 2 fits with the supporting surface 42 to form the transverse welding area 22 . The height of the plane where the transverse welding area 22 is located is higher than the height of the waterline 3 where one end of the through opening 10 close to the transverse welding area 22 is located.

[0084] Specifically, align the column 2 with the through-hole 10 on the support surface 42, and slowly lower it until the bottom surface of the column 2 contacts the support surface 42, ensuring that the position of the column 2 is accurate to avoid deviations in the subsequent welding process. Transverse welding is performed at the edge area where the bottom surface of the column 2 contacts the support surface 42, that is, the transverse welding area 22. The welding speed and temperature should be controlled during welding to ensure that the weld is uniform and dense, forming a firm welding connection.

[0085] In particular, the height of the plane where the transverse welding area 22 is located is higher than the height of the waterline plane 3 where one end of the through opening 10 close to the transverse welding area 22 is located, so as to ensure that the transverse weld is higher than the through opening 10, that is, above the waterline of the through opening 10, thereby ensuring the dryness of the welding environment and further improving the connection stability between the column 2 and the support surface 42.

[0086] In one embodiment, two adjacent support surfaces 42 are connected to form a polygonal shape; and the width of the bottom surface of the column 2 is less than or equal to the width of the polygonal shape.

[0087] Specifically, two adjacent support surfaces 42 are connected to form a polygonal shape, such as a hexagon, etc. The specific shape depends on the number and arrangement of the connecting parts 40. The polygonal design of the supporting surface 42 helps to disperse the pressure and improve the stability of the structure. At the same time, the width of the bottom surface of the column 2 is less than or equal to the width of the polygonal shape, ensuring that the column 2 can be stably placed on the supporting surface 42, and the instability of the supporting structure will not be caused by excessive width, thereby improving the stability and safety of the overall structure, and reducing the production cost and installation difficulty. In practical applications, the shape, size and material of the connecting part 40 and the column 2 can be appropriately adjusted and optimized according to specific needs and conditions.

[0088] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A semi-submersible floating wind power foundation, characterized in that: include: A plurality of independent floating bodies (1), wherein the plurality of floating bodies (1) are connected to each other to form a basic floating body with a polygonal structure or a star structure; A through hole (10) for connection is provided between the connection points of two adjacent floating bodies (1), and a welding area (20) at the connection point is located above the through hole (10); A plurality of columns (2) are installed on the base float.

2. The semi-submersible floating wind power foundation according to claim 1, characterized in that: The floating body (1) includes: The main body (30) is of a longitudinal structure; Connecting parts (40) are respectively arranged at two ends of the main body (30) in the longitudinal direction; The plurality of floating bodies (1) are connected and fixed to each other via the plurality of connecting parts (40), and the upright columns (2) are mounted on the connecting parts (40).

3. The semi-submersible floating wind power foundation according to claim 2, characterized in that: The through opening (10) is provided at the bottom of the two connected connection parts (40), and the through opening (10) passes through the connection parts (40).

4. The semi-submersible floating wind power foundation according to claim 3, characterized in that: The through opening (10) is at least partially exposed above the water plane (3) where the floating body (1) is located.

5. The semi-submersible floating wind power foundation according to claim 3, characterized in that: The cross section of the through opening (10) is a chamfered arc surface, and the welding seam on the arc surface is higher than the water plane (3) where the floating body (1) is located.

6. The semi-submersible floating wind power foundation according to claim 2, characterized in that: The connecting portion (40) comprises: A connecting surface (41) is arranged on one side of the connecting portion (40); The connecting surfaces (41) of two adjacent connecting parts (40) are fixed by welding.

7. The semi-submersible floating wind power foundation according to claim 6, characterized in that: The welding area (20) includes a vertical welding area (21); Two adjacent connection surfaces (41) are fitted together to form the vertical welding area (21), and the lowest point of the vertical welding area (21) is higher than the highest point of the through opening (10).

8. The semi-submersible floating wind power foundation according to claim 6, characterized in that: The connecting portion (40) comprises: A supporting surface (42) is arranged on the upper side of the connecting portion (40); The bottom end of the column (2) is mounted on the supporting surface (42).

9. The semi-submersible floating wind power foundation according to claim 8, characterized in that: The welding area (20) includes a transverse welding area (22); The bottom surface of the column (2) is fitted with the supporting surface (42) to form the transverse welding area (22), and the height of the plane where the transverse welding area (22) is located is higher than the height of the waterline plane (3) where one end of the through opening (10) close to the transverse welding area (22) is located.

10. The semi-submersible floating wind power foundation according to claim 8, characterized in that: Two adjacent support surfaces (42) are connected to form a polygonal shape; the width of the bottom surface of the column (2) is less than or equal to the width of the polygonal shape.

Images