Clamped floating type offshore wind power foundation platform

Abstract

The invention relates to the technical field of offshore wind power generation, and discloses a clamped floating type offshore wind power foundation platform which comprises a floating structure and a clamped structure. The fixed supporting structure is located below the floating structure and arranged underwater in a submerged mode, and the fixed supporting structure is suitable for providing bearing capacity and anti-overturning capacity for the floating structure. The floating structure floats on the water surface so as to be suitable for installing and placing wind power equipment, and the anti-tilting capacity can be improved through the water plane and the gravity center-buoyancy center height difference. The fixed supporting structure limits the horizontal displacement of the floating structure, adjusts the overall gravity center of the offshore wind power foundation and provides the anti-overturning capacity. The clamped floating type offshore wind power foundation platform has multiple composite stability sources, on the premise that the foundation stability is guaranteed, anchor chain mooring structures are reduced, then the occupied area is reduced, the composite stability design is adopted, the situation that the structure size is too large due to a single stability source is avoided, steel materials are further reduced, the weight of the structure is reduced, and the cost is reduced. Therefore, the overall cost and the cost per kilowatt-hour are greatly reduced.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of November 18, 2024, an application number of 202411648342.4, and an invention title of "A Fixed-Supported Floating Offshore Wind Power Foundation Platform". The content recorded in the parent case is incorporated into this application. Technical Field

[0002] The present invention relates to the technical field of offshore wind power generation, and specifically to a fixed-supported floating offshore wind power foundation platform. Background Art

[0003] With the growing global demand for clean energy, wind power generation, as a sustainable energy solution, has attracted increasing attention. Offshore wind power, as an important part of it, has received much attention due to its higher wind energy acquisition efficiency and smaller environmental impact. As offshore wind farms gradually move towards the deep sea and far sea, fixed offshore wind power has gradually lost its technical advantages due to the excessive steel consumption of underwater structures, and floating wind turbines have become a more ideal choice.

[0004] Existing traditional floating foundations usually have only a single source of anti-overturning ability. For example, barge-type and semi-submersible types that rely on the waterplane area, single-column (spar) types that rely on ballast, and tension leg platforms (TLP) that rely on tendon support structures. However, a single stability source will result in a larger size of the floating structure. For example, a larger waterplane area of the floating body will lead to an increase in the steel consumption of the floating body; improving the positioning ability of catenary mooring also requires more steel consumption; the Spar platform requires a longer floating box and a larger total amount of ballast to ensure the height difference between the center of gravity and the center of buoyancy. These platform forms all need to increase the steel consumption of the floating body or mooring structure to provide an anti-overturning moment, which greatly limits the optimization space of steel consumption and the commercialization promotion prospect. At the same time, the problems of large volume and large weight brought by the large steel consumption also pose challenges during the installation of the wind farm. In addition, the catenary mooring form increases the floor area occupied by a single wind turbine, further increasing the cost per kilowatt-hour of the wind farm. Summary of the Invention

[0005] In view of this, the present invention provides a fixed-supported floating offshore wind power foundation platform to solve the problems in the prior art that the high cost of the wind farm, the complication of the installation process, and the increase in the cost per kilowatt-hour of the wind farm caused by the large volume and large weight problems brought by the steel consumption, and the catenary mooring form increases the floor area occupied by a single wind turbine.

[0006] To solve the above technical problems, the technical solution of the present invention is as follows: The present invention provides a fixed floating offshore wind power foundation platform, comprising: a floating structure and a fixed support structure; the fixed support structure is rigidly connected to the floating structure, the floating structure floats on the water surface to be suitable for installing and placing wind power equipment, the fixed support structure is located below the floating structure and is submerged underwater, and the fixed support structure is suitable for providing bearing capacity and anti-overturning ability for the floating structure; the fixed support structure includes a fixed support base and a connecting part; one end of the connecting part is connected to the fixed support base, the other end of the connecting part is connected to the floating structure, several cavities are arranged inside the fixed support base, and several openings are arranged at one end of the fixed support base away from the connecting part, and the openings are communicated with the cavities.

[0007] It has the following advantages: The floating structure floats on the water surface to be suitable for installing and placing wind power equipment, and the anti-overturning ability can be improved by the waterplane and the height difference between the center of gravity and the center of buoyancy; the fixed support structure restricts the horizontal displacement of the floating structure, adjusts the overall center of gravity of the offshore wind power foundation, and provides anti-overturning ability. This fixed floating offshore wind power foundation platform has multiple composite stability sources. On the premise of ensuring the stability of the foundation, the anchor chain mooring structure is reduced, thereby reducing the floor area. And the composite stability design is adopted to avoid the too large structural size caused by a single stability source, further reducing the steel material and the weight of the structure, thus greatly reducing the overall cost and the cost per kilowatt-hour.

[0008] According to some embodiments of the present invention, the connecting part is a single-column structure, a jacket structure or a truss structure.

[0009] According to some embodiments of the present invention, the fixed support base includes an outer cylinder, an inner bulkhead concentrically arranged with the outer cylinder, and a first partition vertically arranged and connected to the outer cylinder and the inner bulkhead. There are multiple first partitions, and they are evenly distributed along the circumferential direction of the inner bulkhead to divide and form multiple cavities. The outer cylinder is a cylindrical structure with one end open and the other end closed.

[0010] According to some embodiments of the present invention, the floating structure includes a connected installation platform and a buoyancy tank. The bottom of the installation platform is rigidly connected to the buoyancy tank. The installation platform is suitable for fixing the wind power equipment, and the bottom of the buoyancy tank is rigidly connected to the fixed support structure.

[0011] According to some embodiments of the present invention, the buoyancy chamber includes a chamber body and a connecting section. One end of the connecting section is connected to the chamber body, and the other end is connected to the installation platform. The internal cavity of the connecting section is communicated with the chamber body. A plurality of second partition plates are horizontally arranged in the chamber body. The second partition plates are adapted to divide the interior of the chamber body into a plurality of chambers. The plurality of chambers are communicated with each other in sequence from top to bottom. A plurality of water through holes are provided at the bottom of the chamber body, and a plurality of ventilation holes are provided on the side wall of the connecting section. A plurality of communication holes are provided on the second partition plates so that the plurality of chambers are communicated with each other in sequence.

[0012] According to some embodiments of the present invention, the ventilation holes are opened on the side wall of the chamber body, are arranged at intervals in the vertical direction, and are correspondingly arranged with each chamber to be adapted to communicate with each chamber.

[0013] According to some embodiments of the present invention, the fixed support structure, the buoyancy chamber and the installation platform are of concrete structure or steel-concrete structure.

[0014] According to some embodiments of the present invention, the installation platform includes a central column, side columns and bypass members connecting the central column and the side columns. The lower end of the central column is rigidly connected to the fixed support structure. A plurality of side columns are provided and are uniformly arranged along the circumferential direction of the central column. One end of the bypass member is connected to the central column, and the other end is connected to the side column.

[0015] According to some embodiments of the present invention, the number of the side columns is the same as that of the bypass members. The distances between the central axes of the plurality of side columns and the central axis of the central column are the same. The plurality of bypass members are all horizontally arranged, and the included angles formed between adjacent two bypass members are the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of a fixed-supported floating offshore wind power foundation platform provided in some embodiments of the present invention; Figure 2 It is a three-dimensional structural diagram of the fixed support structure provided in some embodiments of the present invention;

[0018] Figure 3 It is another three-dimensional structural diagram of the fixed support structure provided in some embodiments of the present invention; Figure 4Schematic plan view of the fixed support structure provided in some embodiments of the present invention.

[0019] Explanation of reference numerals: 1, fixed support structure; 2, floating structure; 11, fixed support base; 12, connecting part; 111, outer cylinder; 112, inner bulkhead; 113, first partition; 21, installation platform; 22, buoyancy tank; 211, central column; 212, side column; 213, bypass part; 221, cabin body; 222, connecting section; 223, second partition. Detailed implementation manners

[0020] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] Refer to Figure 1As shown, the present invention provides a fixed-support floating offshore wind power foundation platform, including: a floating structure 2 and a fixed-support structure 1; the fixed-support structure 1 is rigidly connected to the floating structure 2, the floating structure 2 floats on the water surface to be suitable for installing and placing wind power equipment, the fixed-support structure 1 is located below the floating structure 2 and submerged underwater, and the fixed-support structure 1 is suitable for providing bearing capacity and anti-overturning capability for the floating structure 2.

[0025] Specifically, the floating structure 2 floats on the water surface to be suitable for installing and placing wind power equipment, and the anti-tilting ability can be improved through the waterline and the height difference between the center of gravity and the center of buoyancy; the fixed support structure 1 limits the horizontal displacement of the floating structure 2, adjusts the overall center of gravity of the offshore wind power foundation, and provides anti-tilting ability. The fixed support floating offshore wind power foundation platform has multiple composite stability sources. Under the premise of ensuring the stability of the foundation, the anchor chain mooring structure is reduced, thereby reducing the floor space, and the composite stability design is used to avoid the excessive size of the structure caused by a single stability source, further reducing steel materials and reducing the weight of the structure, thereby significantly reducing the overall cost and the cost per kilowatt-hour.

[0026] It can be understood that, in the present invention, according to the actual installation position of the wind power equipment and environmental conditions, the waterplane area of ​​the floating structure 2, the restoring torque generated by the height difference between the center of buoyancy and the center of gravity, and the anti-overturning moment provided by the fixed structure 1 are relied upon to resist the overturning bending moment generated by the external load. The external load mainly includes the overturning moment generated by external loads such as wind, waves and water flow, so that the structure will not capsize when subjected to the overturning moment and the roll angle is within the specification limit.

[0027] Furthermore, in order to meet the vertical bearing stability, that is, the buoyancy and gravity balance of the whole structure, the fixed support structure 1 will be subjected to the uplift load, which is transmitted to the seabed soil through the outer cylinder 111, the inner bulkhead 112, the first partition 113 and the negative pressure generated in the closed cylindrical structure. The seabed soil in the uplift state can be equivalent to the ballast at the bottom of the structure, which effectively balances the buoyancy and gravity of the whole structure and lowers the center of gravity of the whole structure, so that the restoring moment generated by the height difference between the buoyancy center and the center of gravity is further increased, and the overall anti-overturning ability is enhanced. This makes full use of the uplift bearing capacity of the fixed support foundation and avoids the shortcomings of the column-type structure, such as the need for a large amount of bottom ballast and the restriction on the water depth.

[0028] Reference Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the fixed support structure 1 includes a fixed support base 11 and a connecting portion 12; one end of the connecting portion 12 is connected to the fixed support base 11, and the other end of the connecting portion 12 is connected to the floating structure 2, and the connecting portion 12 is a single column structure, a conductor frame structure or a truss structure.

[0029] Specifically, the fixed support structure 1 is composed of a fixed support base 11 and a connecting part 12. The fixed support base 11 is located below and is connected to the floating structure 2 through the connecting part 12. The fixed support base 11 is mainly used to provide the bottom support of the platform and can be anchored according to the seabed conditions. The connecting part 12 can also effectively transfer the loads of the wind power equipment and the upper structure to the lower fixed support base 11, thus ensuring the stability of the entire platform under different loads.

[0030] Referring to Figures 2 to 4 As shown, specifically, the connecting part 12 is a single-column steel pipe structure or is supported by multiple circular steel pipes. The two ends of the connecting part 12 are rigidly connected to the fixed support base 11 and the buoyancy tank 22 respectively. The top of the connecting part 12 penetrates through the buoyancy tank 22 to extend to be connected to the bottom of the installation platform 21. Inside the buoyancy tank 22, stiffening ribs are arranged on the upper and lower end faces of the connecting part 12 and the buoyancy tank 22 for anchoring treatment to enhance the connection strength and improve the reliability of the structure. The bottom of the connecting part 12 is fixedly connected to the top of the fixed support base 11 through a flange.

[0031] It can be understood that the function of the connecting section 222 is to transfer external environmental loads such as wind, waves and currents. The connecting part 12 can be made of concrete-filled steel tube material to effectively reduce the use of steel. The connecting part 12 has the advantages of rigid connection for load transfer and relatively small hydrodynamic loads. In addition, designs that can achieve rigid connection such as single-column type, jacket or truss structure can all be used as the connecting part 12.

[0032] Referring to Figure 3 As shown, in some embodiments of the present invention, several cavities are provided inside the fixed support base 11, and several openings are provided at one end of the fixed support base 11 away from the connecting part 12, and the openings are communicated with the cavities.

[0033] In some embodiments of the present invention, the fixed support base 11 includes an outer cylinder 111, an inner cabin wall 112 concentrically arranged with the outer cylinder 111, and a first partition 113 vertically connecting the outer cylinder 111 and the inner cabin wall 112. There are multiple first partitions 113, and they are evenly distributed along the circumferential direction of the inner cabin wall 112 to divide and form multiple cavities. The outer cylinder 111 is a cylindrical structure with one end open and the other end closed.

[0034] Specifically, the outer cylinder 111, the inner bulkhead 112, and the first partition 113 are all made of steel plate structures. By arranging the inner bulkhead 112 inside the outer cylinder 111, both the outer cylinder 111 and the inner bulkhead 112 are cylindrical and concentrically arranged. The first partition 113 is vertically placed between the outer cylinder 111 and the inner bulkhead 112. Multiple first partitions 113 are provided and arranged at intervals along the circumferential direction of the inner bulkhead 112, so as to evenly divide the space between the outer cylinder 111 and the inner bulkhead 112, forming multiple cavities. The setting of multiple cavities makes the structure of the fixed support base 11 compact. The first partition 113 forms a rib plate to be suitable for evenly distributing the resistance and avoiding the concentration of resistance on one side, so as to enhance the structural strength.

[0035] It can be understood that one end of the outer cylinder 111 is open and the other end is closed, and the opening is far from the connecting part 12. During the installation process, by facing the opening downward and inserting it below the mud surface, the soil enters the cavity, so that the gravity of the fixed support base 11 increases, the center of gravity is lowered, and the height difference between the buoyancy center and the center of gravity of the structure is further increased, improving the anti-overturning ability.

[0036] In some embodiments of the present invention, the floating structure 2 includes a connected installation platform 21 and a buoyancy chamber 22. The bottom of the installation platform 21 is rigidly connected to the buoyancy chamber 22. The installation platform 21 is suitable for fixing wind power equipment, and the bottom of the buoyancy chamber 22 is rigidly connected to the fixed support structure 1.

[0037] Refer to Figure 4 As shown, in some embodiments of the present invention, the buoyancy chamber 22 includes a chamber body 221 and a connecting section 222. One end of the connecting section 222 is connected to the chamber body 221, and the other end is connected to the installation platform 21. The internal cavity of the connecting section 222 is communicated with the chamber body 221. A plurality of second partitions 223 are horizontally arranged in the chamber body 221. The second partitions 223 are suitable for partitioning the interior of the chamber body 221 to form a plurality of chambers. The plurality of chambers are communicated in sequence from top to bottom. A plurality of water passing holes are provided at the bottom of the chamber body 221, a plurality of ventilation holes are provided on the side wall of the connecting section 222, and a plurality of communication holes are provided on the second partitions 223 to enable the plurality of chambers to be communicated in sequence.

[0038] The buoyancy chamber 22 is arranged at the upper end of the connecting part 12 and is rigidly connected to the bottom of the installation platform 21. During transportation, the buoyancy is adjusted by adjusting the internal water pressure of the buoyancy chamber 22 to facilitate transportation; after the assembly is determined, a mud material with a density greater than that of seawater is poured into the buoyancy chamber 22 to ensure stability. The setting of the buoyancy chamber 22 can ensure that the platform has adjustable buoyancy and balance ability under different working conditions.

[0039] Specifically, the connecting section 222 is used to connect the installation platform 21 and the cabin body 221. Inside the cabin body 221, multiple second partition plates 223 are horizontally arranged to divide the cabin body 221 into multiple chambers. The multiple chambers are arranged from top to bottom. Multiple communication holes are provided on the second partition plates 223 to communicate the multiple chambers. A water passing hole is opened at the bottom of the cabin body 221, and an air vent hole is opened on the side wall of the connecting section 222. During transportation, both the water passing hole and the air vent hole are opened. By controlling the air intake and water intake, the floating amount of the buoyancy chamber 22 is controlled to facilitate transportation. When the buoyancy chamber 22 needs to dive, by pressing down the buoyancy chamber 22, water enters the chamber through the water passing hole, and the air in the chamber is discharged from the air vent hole under the extrusion of the liquid, so that the weight of the buoyancy chamber 22 increases and the buoyancy chamber 22 dives; when the buoyancy chamber 22 needs to float, by ventilating the air vent hole, the air squeezes out the liquid in the chamber, thereby reducing the mass of the buoyancy chamber 22 and the buoyancy chamber 22 floats. The water intake volume in the buoyancy chamber 22 can be controlled through the water passing hole and the air vent hole, which is convenient for controlling the attitude and transportation.

[0040] It can be understood that after the fixed support structure 1 is transported to the designated position, the water passing hole is blocked, and grout is poured into the air vent hole. By pouring ballast such as mortar and cement, the weight of the buoyancy chamber 22 is increased, so that the buoyancy chamber 22 sinks, and the fixed support base 11 is inserted below the mud surface, so that the fixed support structure 1 is placed vertically. By pouring ballast such as mortar and cement into the buoyancy chamber 22, the vertical bearing capacity requirement is met. After the fixed support structure 1 is installed and fixed, the installation platform 21 is fixed on the fixed support structure 1 to realize the installation of the fixed support floating offshore wind power foundation platform.

[0041] In some embodiments of the present invention, the air vent holes are opened on the side wall of the cabin body 221, are arranged at intervals in the vertical direction, and are correspondingly arranged with each chamber to communicate with each chamber.

[0042] Specifically, since the interior of the cabin body 221 is divided into multiple chambers by the second partition plates 223, the structural strength is improved, and a single chamber is avoided, so as to prevent depression when the buoyancy chamber 22 is externally impacted. Air vent holes are opened on the side wall of the buoyancy chamber 22, and multiple air vent holes are evenly distributed along the vertical direction of the buoyancy chamber 22, so that each chamber communicates with the outside, thereby realizing the buoyancy control of a single chamber and improving the operation convenience.

[0043] In some embodiments of the present invention, the fixed support base 11, the buoyancy chamber 22 and the installation platform 21 are made of steel structure, concrete structure or steel-concrete structure.

[0044] Specifically, to reduce the use of steel structure, the fixed support base 11, the buoyancy chamber 22, the connecting part 12 and / or the installation platform 21 can adopt concrete structure or steel-concrete structure, which can reduce costs while ensuring the structural strength.

[0045] In some embodiments of the present invention, the installation platform 21 includes a central column 211, side columns 212, and bypass members 213 connecting the central column 211 and the side columns 212. The lower end of the central column 211 is rigidly connected to the fixed support structure 1. There are multiple side columns 212, which are evenly arranged along the circumferential direction of the central column 211. One end of the bypass member 213 is connected to the central column 211, and the other end is connected to the side column 212.

[0046] Specifically, the installation platform 21 relies on the waterplane area to provide a restoring moment. The installation platform 21 will be subjected to uneven buoyancy forces, thereby generating a restoring moment, which is the first source of composite stability. In addition, the central column 211 also serves as a connection section 222 for upper structures such as the nacelle and the tower, transmitting the aerodynamic loads from the tower and the nacelle.

[0047] Specifically, the floating structure composed of the installation platform 21 and the buoyancy chamber 22 has a certain displacement, making the center of buoyancy of the overall structure close to the floating structure 2. Due to the seabed soil driven by the uplift of the fixed support structure 1, the center of gravity of the overall structure is biased downward. The height difference formed by the center of buoyancy and the center of gravity gives the overall structure a high anti-overturning ability, which is the second source of composite stability. In addition, the fixed support base 11 of the fixed support structure 1 also provides anti-overturning ability. Therefore, the first source of composite stability, the second source, and the anti-overturning ability provided by the fixed support base 11 constitute the composite stability of the fixed floating offshore wind power foundation platform, which makes full use of the composite characteristics of the structure and does not require additional mooring chains, thereby reducing the cost per unit of electricity.

[0048] In some embodiments of the present invention, the number of side columns 212 is the same as that of the bypass members 213. The distances between the axes of the multiple side columns 212 and the central axis of the central column 211 are the same. The multiple bypass members 213 are all horizontally arranged, and the angles formed between adjacent bypass members 213 are the same.

[0049] Specifically, the installation platform 21 is a multi-column semi-submersible platform. By horizontally arranging the bypass members 213, one end of the bypass member 213 is connected to the side column 212, and the other end is connected to the central column 211, so that the distances between the axes of the side columns 212 and the axis of the central column 211 are all the same, ensuring the stability and strength of the structure.

[0050] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A fixed floating offshore wind power foundation platform, characterized in that: include: A floating structure (2) and a fixed structure (1); The fixed support structure (1) is rigidly connected to the floating structure (2); the floating structure (2) floats on the water surface to be suitable for installing and placing wind power equipment; the fixed support structure (1) is located below the floating structure (2) and is submerged in the water; the fixed support structure (1) is suitable for providing bearing capacity and anti-overturning capacity for the floating structure (2); The fixed support structure (1) comprises a fixed support base (11) and a connecting portion (12); one end of the connecting portion (12) is connected to the fixed support base (11), and the other end of the connecting portion (12) is connected to the floating structure (2); a plurality of cavities are provided inside the fixed support base (11); a plurality of openings are provided at one end of the fixed support base (11) away from the connecting portion (12), and the openings are connected to the cavities; the fixed support base (11) comprises an outer cylinder (111), an inner bulkhead (112) arranged concentrically with the outer cylinder (111), and a vertically connected outer cylinder (111). ) and a first baffle (113) of the inner bulkhead (112), the first baffle (113) being provided in plurality and being evenly distributed along the circumference of the inner bulkhead (112) so as to separate and form a plurality of cavities, the outer cylinder (111) being a cylindrical structure with one end open and the other end closed, the outer cylinder (111) being open at one end and closed at the other end, and the opening being away from the connecting portion (12), during the installation process, by inserting the outer cylinder (111) with the opening facing downwards below the mud surface, mud enters the cavity, so that the gravity of the fixed support base (11) is increased, the center of gravity is lowered, the height difference between the center of buoyancy and the center of gravity of the structure is further increased, and the anti-overturning capability is improved.

2. The fixed floating offshore wind power foundation platform according to claim 1, characterized in that: The connecting portion (12) is a single column structure, a pipe frame structure or a truss structure.

3. The fixed floating offshore wind power foundation platform according to claim 2, characterized in that: The floating structure (2) comprises a mounting platform (21) and a buoyancy chamber (22) connected to each other, the bottom of the mounting platform (21) being rigidly connected to the buoyancy chamber (22), the mounting platform (21) being suitable for fixing the wind power equipment, and the bottom of the buoyancy chamber (22) being rigidly connected to the fixed support structure (1).

4. The fixed floating offshore wind power foundation platform according to claim 4, characterized in that: The buoyancy tank (22) comprises a tank body (221) and a connecting section (222), one end of the connecting section (222) is connected to the tank body (221), and the other end is connected to the mounting platform (21), the internal cavity of the connecting section (222) is connected to the tank body (221), a plurality of second partitions (223) are horizontally arranged in the tank body (221), the second partitions (223) are suitable for partitioning the interior of the tank body (221) into a plurality of chambers, the plurality of chambers are sequentially connected from top to bottom, a plurality of water holes are arranged at the bottom of the tank body (221), a plurality of air holes are arranged on the side wall of the connecting section (222), and a plurality of connecting holes are arranged on the second partition (223), so that the plurality of chambers are sequentially connected. The air holes are opened on the side wall of the tank body (221), and are arranged at intervals in the vertical direction, and are arranged corresponding to each of the chambers, so as to be suitable for connecting each of the chambers.

5. According to the fixed-support floating offshore wind power foundation platform of one of the preceding claims, the connecting part (12) is a single-column steel pipe structure or is supported by multiple circular steel pipes, and the two ends of the connecting part (12) are rigidly connected to the fixed-support base (11) and the buoyancy tank (22) respectively, and the top of the connecting part (12) is passed through the buoyancy tank (22) to extend to connect with the bottom of the installation platform (21), and in the buoyancy tank (22), stiffening ribs are arranged on the upper and lower end surfaces of the connecting part (12) and the buoyancy tank (22) for anchoring treatment to enhance the connection strength and improve the reliability of the structure, and the bottom of the connecting part (12) is fixedly connected to the top of the fixed-support base (11) through a flange.

6. The fixed floating offshore wind power foundation platform according to any of the preceding claims, characterized in that: The fixed support structure (1), the buoyancy chamber (22) and the installation platform (21) are steel structures, concrete structures or steel-concrete structures.

7. The fixed floating offshore wind power foundation platform according to any of the preceding claims, characterized in that: The fixed support base (11), the buoyancy chamber (22), the connecting portion (12) and / or the installation platform (21) may be made of a concrete structure or a steel-concrete structure.

8. A fixed-support floating offshore wind power foundation platform according to any of the preceding claims, wherein the installation platform (21) comprises a central column (211), a side column (212) and a bypass piece (213) connecting the central column (211) and the side column (212), the lower end of the central column (211) is rigidly connected to the fixed-support structure (1), a plurality of side columns (212) are provided and are evenly arranged along the circumference of the central column (211), one end of the bypass piece (213) is connected to the central column (211), and the other end is connected to the side column (212); The number of the side columns (212) and the bypass pieces (213) is the same, the distances between the axes of the multiple side columns (212) and the center axis of the center column (211) are the same, the multiple bypass pieces (213) are all arranged horizontally, and the angles formed between two adjacent bypass pieces (213) are the same; The installation platform (21) is a multi-column semi-submersible platform. The bypass piece (213) is horizontally arranged, one end of the bypass piece (213) is connected to the side column (212), and the other end is connected to the central column (211), so that the distance between the axis of the side column (212) and the axis of the central column (211) are consistent, thereby ensuring the stability and strength of the structure.

Images