CN115977886A - Floating type fan foundation suitable for deep and far sea installation - Google Patents

Abstract

The invention discloses a floating type fan foundation suitable for deep and open sea installation, which comprises a plurality of peripheral stand columns (2), a central stand column (3), a supporting member (5) and a mooring chain (6), wherein the peripheral stand columns are installed on the periphery of the central stand column through the supporting member and are obliquely installed outwards; the bottom of each peripheral upright post is connected with a floating body (4), the center of the floating body is vertically and crossly connected with the central upright post, and the floating bodies are connected with the peripheral upright posts, the central upright posts and the supporting structure into a whole. The invention is suitable for deep and open sea areas with average water depth of 100 m and above, can carry a fan with large capacity of 16MW and above, can effectively reduce the steel consumption, and has simple construction and low cost.

Description

Floating type fan foundation suitable for deep and far sea installation

Technical Field

The invention relates to the offshore wind power technology, in particular to a floating type fan foundation suitable for deep and open sea installation.

Background

With the gradual development of global offshore resources and the high sea demand of offshore area industry, the total development potential of offshore wind power is limited, the offshore wind power project gradually develops to the deep open sea, and the foundation structure of the offshore wind turbine gradually evolves from a fixed support structure to a floating support structure along with the change of water depth.

The floating offshore wind turbine foundation structure is a structure for supporting a wind turbine unit on the sea. The existing floating type wind turbine foundation structure in China is only suitable for being installed in water with the depth of 100 meters, and the power of the carried wind turbine is not more than 10MW, for example, a three-column semi-submersible type floating foundation, a bottom triangle and a top Y-shaped combined structure is adopted in a floating type offshore wind power platform structure located in the Yangtze river sea area of Guangdong, the wind turbine is located on one of the columns, the whole system is leveled through ballast, the wind turbine with the depth of 5.5MW is carried, and the wind turbine is 28 kilometers off the shore and is installed in the position with the depth of 30 meters; the 'shaking-up' floating offshore wind power platform structure located in the Zhanjiang sea area adopts a three-column semi-submersible floating foundation, the top and the bottom of the floating offshore wind power platform structure are triangular combined structures, a fan is located on one of the columns, the whole system is leveled through ballasting, a 6.2MW fan is carried, and the floating offshore wind power platform structure is installed at the position of the average water depth of about 65 meters.

The design difficulty of the deep and open sea floating type fan platform in the deep and open sea area with the average water depth of more than 100 meters is higher: on one hand, the main scale design of the floating type fan foundation directly determines the steel consumption of the floating body, the floating body is a main factor influencing the economy of the whole fan project, the response analysis of the floating body under the combined action of deep sea wave current, fan load, mooring force and the like is more difficult, and the difficulty of structural strength analysis is improved; on the other hand, the floating type wind turbine has unique technical requirements on the floating type wind turbine, the high-grade typhoon resistance requirement, the load of the wind turbine is larger and larger when the wind turbine is carried with a large-capacity wind turbine with the power of 16MW or more, the working technical requirement is higher and higher, and the requirements on the anti-overturning capacity, the positioning mooring capacity, the stability and the like of the floating body are higher. Therefore, it is necessary to design a floating type wind turbine foundation suitable for deep open sea areas with an average water depth of 100 m or more.

Chinese patent application CN108146588A discloses a marine floating wind power foundation structure, which is a Y-shaped structure composed of three upright posts, a central buoy and a truss. Although the structure can reduce the gravity center through the central buoy, improve the structural stability, improve the whole waterplane area of the structure through the stand column, increase the waterplane rigidity, further reduce the surging motion amplitude of the structure and improve the effective power generation time, because the bottom of the stand column is not supported, the connecting structure between the bottom of the three stand columns and the bottom of the central buoy is too simple, the proportion of the connecting structure relative to the stand column is small, the water discharge volume, particularly the ballast adjustment range and the whole structural strength are limited, the stand column is installed perpendicular to the water surface, the structural stability is improved through the longer central buoy, the area moment of the waterplane and the increase of the waterplane rigidity are limited in storm weather, the restoring moment under a certain inclination angle is smaller, and the requirements of the whole strength and the stability of a deep open sea on a fan foundation cannot be met.

Disclosure of Invention

The invention aims to solve the technical problem of providing an offshore floating type fan foundation which is good in economy, strong in anti-overturning capability, good in stability, large in structural strength, capable of carrying a fan with a large capacity of 16MW or more and suitable for deep and open sea installation, aiming at the defect that a deep and open sea area with an average water depth of 100 m or more does not have a suitable floating type fan foundation.

In order to solve the technical problems, the invention adopts the following technical scheme:

a floating type wind turbine foundation suitable for deep open sea installation comprises a plurality of peripheral stand columns, a central stand column, supporting members and mooring chains, wherein the periphery of the central stand column is connected with the peripheral stand columns through the supporting members, and the floating type wind turbine foundation comprises:

the peripheral upright posts are obliquely installed outwards, and the peripheral upright posts are divided into an upper section, a middle section and a lower section along the height direction of the peripheral upright posts, the cross sectional area of the middle section is larger than that of the lower section, the upper section is arranged above a water plane, the middle section is arranged in the water plane, and the lower section is arranged below the water plane;

the bottom of the peripheral upright post is connected with a floating body with a ballast tank arranged inside, the floating body is horizontally arranged, and the center of the floating body is vertically and crossly connected with the central upright post;

the floating body is of a Y-shaped structure with three branches, each branch comprises a connecting buoy and a heaving buoy, one end of each branch of the connecting buoy is connected into a whole, the other end of each branch of the connecting buoy is outwards radiated and connected with the heaving buoy, the central upright post is connected with the connecting center of each connecting buoy, the peripheral upright posts are connected with the heaving buoy, each branch, the peripheral upright posts and the supporting members mounted on the branch of each branch of the connecting buoy form a group of structures, each group of structures are independently arranged and connected with the central upright post into a whole, and adjacent groups of structures are in 120-degree rotational symmetry or are symmetrical about longitudinal sections of the adjacent groups of structures.

The floating body is arranged at the bottom of the peripheral upright post and on the central upright post, the floating body is of a Y-shaped structure with three branches, each branch, the peripheral upright post and the supporting member arranged on the branch form a group of structures, each group of structures are independently arranged and then are connected with the central upright post into a whole, no connecting member is arranged between the adjacent groups of structures, the adjacent groups of structures are in 120-degree rotational symmetry or are symmetrical about the longitudinal section of the structures, and the ballast tank is arranged in the structure and matched with the ballast tank at the bottom of the central upright post to be used as main ballast.

In addition, the peripheral upright post is obliquely installed outwards, the peripheral upright post is divided into an upper section, a middle section and a lower section along the height direction of the peripheral upright post, the cross sectional area of the middle section is larger than that of the lower section, so that the middle section protrudes out of the lower section, meanwhile, the upper section is arranged above a waterline plane, the middle section is arranged in the waterline plane, and the lower section is arranged below the waterline plane.

Preferably, the peripheral uprights are inclined at an angle of 15-30 °.

Preferably, the connection flotation pontoon is the rectangle flotation pontoon, it is cylindric flotation pontoon to heave the flotation pontoon, just the connection flotation pontoon with the upper surface that the flotation pontoon is swayed sets up to the platform.

Preferably, the diameter of the heave pontoon is larger than the diameter of the perimeter column.

Preferably, the support member comprises an upper support member and a lower sprag member.

Preferably, the middle section is connected with the upper section or the lower section through a transition section, and the cross-sectional area of the transition section is of a gradual change structure.

Preferably, the mooring chain is suspended below the water level of the mid-section of the perimeter column.

Preferably, the lower portion of the mid-section is located within a range of 3-5 meters below the water plane, and the upper portion of the mid-section is located within a range of 3 meters above the water plane.

Preferably, the diameter of the middle section is 1.2 to 1.8 times the diameter of the upper section or the diameter of the lower section.

Preferably, the central upright column comprises a first section, a second section, a third section and a fourth section which are sequentially arranged from top to bottom, the first section is of a double-shell structure comprising an outer shell and an inner shell, the outer shell is connected with the supporting member, the upper end of the inner shell is connected with the fan tower drum, the lower end of the inner shell is connected with the upper end of the second section, the lower end of the second section is telescopically connected with the upper end of the third section, the lower end of the third section is connected with the fourth section, and the overall dimension of the fourth section is increased to form the buoy.

The invention mainly comprises a plurality of peripheral upright posts, a central upright post, a supporting member for connecting the peripheral upright posts and the central upright post and a bottom floating body, wherein the peripheral upright posts are obliquely and outwards arranged on the bottom floating body, the peripheral upright posts are divided into an upper section, a middle section and a lower section along the height direction, the middle sections of the peripheral upright posts are positioned near a water line plane, the cross section area of the middle sections of the peripheral upright posts is larger than that of the lower sections, and the middle sections are connected with the upper sections and the lower sections through a rounding structure of a transition section; the central upright column is vertically and upwards installed, the top of the central upright column is designed into a double-shell structure, a high-capacity megawatt-level floating fan (16 MW and above) is installed at the top of the central upright column, a third section at the lower part of the central upright column is set into a telescopic structure, and meanwhile, the cross sectional area of a fourth section of the central upright column is increased and set into a main ballast tank; the bottom floating body and the central upright post are connected by adopting a Y-shaped base with three branches, the included angle of each branch is 120 degrees, 3 toe ends of the floating body are designed into circular floating cylinders to be used as a heave cabin, and the peripheral upright post on the bottom floating body and the central upright post are connected and supported by adopting inclined struts to keep the stability and the strength of the integral structure of the floating body.

The mooring system adopts a mooring cable arrangement scheme, the top mooring chains are installed and connected to three peripheral stand columns which are gradually inclined outwards and are positioned below a water plane, the bottom mooring chains are connected to seabed anchor piles by adopting a shared anchor scheme, corresponding anchor piles can be arranged in a floating type fan foundation group according to arrangement, and adjacent floating bodies can share anchor pile foundations.

Compared with the prior art, the invention has the beneficial effects that:

(1) The floating type fan foundation provided by the invention has the advantages of high overall comprehensive performance, simple and compact structural layout, higher structural utilization rate, simple construction, low manufacturing cost and good economy, and can effectively reduce the steel consumption of the floating type fan foundation per megawatt;

(2) The supporting structure between the peripheral upright post and the central upright post and the Y-shaped structure matched with the floating body of the base can ensure that the total strength of the floating body structure meets the standard requirement, and the whole floating body foundation can resist the integrated load requirements of typhoon with the highest grade, wave load with water depth of 100 meters and above, mooring and the like;

(3) According to the double-shell structure with the large diameter at the upper part of the central upright column, the outer shell is convenient for the connection and welding construction of the supporting structure between the peripheral upright column and the central upright column, and the inner shell of the central upright column is continuously butted with the base of the fan tower cylinder, so that the structural strength of the base of the fan tower cylinder is convenient to ensure;

(4) The peripheral upright columns are gradually inclined, so that the area moment of a waterline surface is increased along with the increase of draught, when the floating foundation has a certain inclination angle, the restoring moment is larger than that of the peripheral upright columns which are vertically arranged, the loss of drainage volume after a certain inclination angle can be compensated, the stability performance of the floating body can be further improved, and the draught can be conveniently adjusted according to the operation requirement during design;

(5) The increase of the local diameter of the upper and lower areas of the draught surface of the peripheral upright column can gradually increase the drainage volume, thereby increasing the buoyancy, ensuring the normal work of the fan, and supplementing extra buoyancy after a certain inclination angle is formed on the floating foundation to ensure the stability of inclined power generation so as to improve the power generation efficiency;

(6) The fan is arranged on the central upright post, and the ballast tank structure at the bottom of the central upright post can greatly reduce the gravity center of the floating body and greatly improve the stability of the whole floating fan foundation;

(7) The invention adopts a mooring cable arrangement scheme, can arrange mooring schemes such as 3x1,3x2,3x3 and the like according to actual needs, a mooring chain is installed and connected on three peripheral upright columns which are gradually inclined outwards, and a connecting point is positioned below a water plane, so that the corrosion of the mooring chain in the air due to long-term exposure can be reduced, the collision with a bottom structure is avoided, the berthing installation of a ship is convenient, and the power generation efficiency of a fan and the economy of a platform are improved by combining a shared anchor scheme;

(8) The central upright post structure below the floating body is inserted into the central upright post above the floating body, so that the floating fan foundation can be conveniently and dryly dragged and installed in batches.

(9) The floating type wind turbine foundation can be widely applied to deep and open sea areas such as the south China sea and the east China sea, and for the development of the floating type offshore wind power technical level of China, the floating type offshore wind power design innovation is promoted, and particularly, the floating type offshore wind turbine foundation design and the research and development of a large-capacity offshore wind power generator set are actively promoted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a system of the invention for adapting to a floating wind turbine foundation installed in deep and open sea.

FIG. 2 is a side view of the floating wind turbine foundation of the present invention adapted for deep open sea installation.

FIG. 3 is an isometric view of the floating wind turbine foundation of the present invention adapted for deep open sea installation.

Fig. 4 is a schematic diagram of the floating type fan foundation suitable for deep and open sea installation before launching after construction is completed.

Fig. 5 is a schematic diagram of the batch dry-mopping of the floating type fan foundation suitable for deep and open sea installation.

In the figure:

1-a tower tube;

2-peripheral upright column, 2-1-upper section, 2-4-lower section, 2-2-transition section, 2-3-middle section;

3-central column, 3-1-first section, 3-2-second section, 3-3-third section, 3-4-fourth section;

4-buoy, 4-1-connecting buoy, 4-2-heaving buoy;

5-support member, 5-1-upper support member, 5-2-lower diagonal support member;

6- -mooring chain;

7- -semi-submersible transport vessel.

Detailed Description

The invention is further described below with reference to specific preferred examples, without thereby limiting the scope of protection of the invention.

For convenience of description, the relative positional relationship of the components, such as: the descriptions of up, down, left, right, etc. are made with reference to the layout directions of the drawings in the specification, and do not limit the structure of the patent.

As shown in fig. 1 to 3, an embodiment of the floating wind turbine foundation suitable for deep open sea installation of the present invention includes three peripheral columns 2 having the same size, a central column 3, a floating body 4 serving as a base of the peripheral column 2, a support member 5, and a mooring chain 6, wherein the three peripheral columns 2 are uniformly installed on the periphery of the central column 3 through the support member 5, the upper end of the central column 3 is connected to a tower 1 having a large-capacity wind turbine, each peripheral column 2 is connected to the mooring chain 6, and ballast tanks are respectively disposed in the peripheral columns 2, the central column 3, and the floating body 4, so as to form a platform for installing a marine floating wind turbine.

The peripheral upright posts 2 of the embodiment are all inclined outwards, the inclination angle is 15-30 degrees, the peripheral upright posts 2 are divided into an upper section 2-1, a middle section 2-3 and a lower section 2-4 along the height direction, the diameters of the upper section 2-1 and the lower section 2-4 are the same, and the diameter of the middle section 2-3 is larger than that of the upper section 2-1 or the lower section 2-4. Preferably, the diameter of the middle section 2-3 is 1.2-1.8 times of the diameter of the upper section 2-1 and the lower section 2-4, and the middle section 2-3 is respectively connected with the upper section 2-1 and the lower section 2-4 through the transition section 2-2 with gradually changed diameters. When the floating type wind turbine foundation is used, the upper section 2-1 of the peripheral upright post 2 is arranged higher than the water line surface, the lower end of the middle section 2-3 is positioned in the range of 3-5 meters below the water line surface, the upper end of the middle section 2-3 is positioned in the range of more than 3 meters above the water line surface, and the lower section 2-4 is arranged lower than the water line surface, so that the drainage volume is increased after the draught of the floating type wind turbine foundation is increased when the floating type wind turbine foundation is inclined, and the stability and the power generation efficiency of the floating type wind turbine are improved. In addition, the mooring chain 6 is hung on the lower part of the middle section 2-3 of the peripheral upright post 2, which is positioned below the water line surface, so that the structure of the suspension part of the mooring chain is reinforced.

The central upright post 3 of the embodiment comprises a first section 3-1, a second section 3-2, a third section 3-3 and a fourth section 3-4 which are sequentially connected from top to bottom. The first section 3-1 and the second section 3-2 are positioned above the floating body 4, and the third section 3-3 and the fourth section 3-4 are positioned below the floating body 4. The first section 3-1 is a double-shell structure comprising an outer shell and an inner shell, the outer shell is connected with the supporting member 5, and the upper end of the inner shell is connected with the fan tower barrel 1. The diameter of the outer shell is more than 3 meters larger than that of the inner shell, namely, a space with the width of at least 1.5 meters is formed between the inner shell and the outer shell, so that the support members 5 can be welded between the peripheral upright 2 and the outer shell of the central upright 3. In order to facilitate the welding of the inner shell and the fan tower barrel 1, the diameter of the inner shell is the same as that of the fan tower barrel 1. The central upright post 3 adopts a double-shell structure to realize the installation of the supporting member 5 and the fan tower drum 1, can provide sufficient structural reinforcement, and ensures the structural strength of the base of the fan tower drum. Also for the sake of simplifying the connection, in this embodiment, the inner shell and the second section 3-2 are of an integral structure, and the inner shell and the second section 3-2 have the same diameter. In order to facilitate towing and transportation of the floating fan foundation, the lower end of the second section 3-2 is telescopically connected with the upper end of the third section 3-3. In the embodiment, the diameter of the third section 3-3 is smaller than that of the second section 3-2, so that the upper end of the third section 3-3 can be pre-inserted into the lower end of the second section 3-2 by adopting a mechanical connection structure during towing transportation, and the third section 3-3 gradually slides down to a corresponding position through the mechanical connection structure after being transported to a working place. The ballast tank is arranged in the third section 3-3, the diameter of the fourth section 3-4 is increased to form a large-diameter buoy, and the ballast content and the ballast volume of the ballast tank and the buoy can be adjusted according to the requirement of the working water depth so as to control the weight center of gravity of the whole floating body, thereby greatly reducing the center of gravity of the floating body, being beneficial to the stability of the whole floating fan foundation and reducing the motion response of the floating body.

The floating body 4 of the present embodiment is horizontally installed at the bottom of the second section 3-2 of the central column 3, the middle part of the floating body 4 is connected with the central column 3, and the periphery of the floating body 4 extends to the bottom of the peripheral column 2. The floating body 4 is of a Y-shaped structure with three branches, the structural form of each branch is the same, and the included angle between every two adjacent branches is 120 degrees. The branches comprise connecting buoys 4-1 and heaving buoys 4-2, one end of each connecting buoy 4-1 of each branch is connected into a whole, the other end of each connecting buoy is radiated outwards and connected with the heaving buoy 4-2, the bottoms of the three peripheral upright columns 2 are respectively connected with one heaving buoy 4-2, and the central upright column 3 is connected with the connecting center of each connecting buoy 4-1. The connecting buoy 4-1 is a rectangular buoy, the heaving buoy 4-2 is a cylindrical buoy, and the upper surfaces of the connecting buoy 4-1 and the heaving buoy 4-2 are provided with platforms, so that the peripheral upright posts 2 are convenient to install and can be used as working platforms during operation and maintenance. In order to reduce the surging amplitude, the diameter of the heave pontoon 4-2 is larger than that of the peripheral upright post 2.

The interior of the floating body 4 is provided with a permanent ballast tank which is matched with ballast tanks arranged in the third section 3-3 and the fourth section 3-4 of the central upright post 3 and is used as a main source for controlling the stability of the floating body. Ballast tanks are also provided in the perimeter columns 2 for auxiliary ballast adjustment.

Each branch, the peripheral upright posts 2 and the supporting members 5 which are arranged on the branch form a group of structures, each group of structures are independently arranged and are connected with the central upright post 3 into a whole, and the adjacent groups of structures are in 120-degree rotational symmetry or are symmetrical about the longitudinal section thereof. The peripheral upright posts 2 and the central upright post 3 are connected into a whole through the floating bodies 4 and the supporting members 5, and meanwhile, the peripheral upright posts 2 are not only connected to the deck of the floating bodies 4, but also extend into the floating bodies 4 to be connected with the bottom plates of the floating bodies 4, so that the overall structural strength of the wind power generation device is improved, and further structural support is provided for carrying high-capacity fans of 16MW and above.

The supporting member 5 of the embodiment is composed of an upper supporting member 5-1 and a lower inclined strut member 5-2, the upper supporting member 5-1 is horizontally arranged between the upper section 2-1 of the peripheral upright post 2 and the outer shell of the first section 3-1 of the central upright post 3, the lower inclined strut member 5-2 is obliquely arranged between the lower section 2-4 of the peripheral upright post 2 and the outer shell of the first section 3-1 of the central upright post 3, wherein the number of the upper supporting member 5-1 and the lower inclined strut member 5-2 is increased according to the requirement of the overall strength of the structure, and the supporting form is changed correspondingly. So, be connected center pillar 3 and peripheral stand 2 with supporting component 5, can improve the stability of fan tower section of thick bamboo base on the center pillar 3, reduce the response of fan vibration to body structure, fully guarantee whole body structure's intensity requirement.

The floating type fan foundation floating body suitable for deep and open sea installation of the embodiment adopts a 3x2 (or 3x1,3x3 and the like) mooring arrangement scheme, the mooring chain 6 is hung at the position below the water plane of the middle section 2-3 of the peripheral upright post 2, corrosion of the mooring chain due to long-term exposure of air can be reduced, the inclined peripheral upright post 2 can avoid collision contact between the mooring chain 6 and the floating body 4, and mooring installation at the installation position is guaranteed. In addition, the middle section 2-3 of the peripheral upright post 2 can have sufficient structure strengthening space below the waterline surface, and the requirement of the mooring chain 6 on the local strength of the structure is met.

In the aspect of construction, transportation and installation of the floating type fan foundation suitable for deep and open sea installation of the embodiment, the peripheral upright columns 2, the central upright column 3, the buoys 4 and the support members 5 can be constructed in sections, after the third section 3-3 and the fourth section 3-4 of the central upright column 3 are constructed in sections, the peripheral upright columns 2, the first section 3-1, the second section 3-2 and the support members 5 are inserted into the buoys 4 through mechanical connecting devices, as shown in fig. 4, and then the peripheral upright columns 2, the first section 3-1, the second section 3-2 and the support members 5 are gradually folded by taking the bottom buoys 4 as a reference. After the integral water is drained, the third section 3-3 and the fourth section 3-4 of the central upright post 3 are ballasted and slide down through a mechanical device, and the whole ship inclination test is carried out. Finally, the assembled whole floating body can be transported to an installation wharf to carry out complete machine installation of the fan tower barrel 1, the floating body can be towed dry by a semi-submersible type transport ship 7 in batches as shown in figure 5, the floating body shown in figure 4 can be towed to the installation wharf to carry out installation of the fan tower barrel 1, then, the bottom floating body 4 is adopted to be matched with the lower half sections 3-3 and 3-4 of the upright posts 3 to serve as main ballast, the inside of the peripheral upright posts 2 is auxiliary ballast to tow draft of the whole floating fan platform system, the whole floating fan platform system is towed to a working sea area in a wet mode, the third section 3-3 and the fourth section 3-4 of the central upright post 3 are lowered to corresponding positions according to the draft condition of the working sea area, the ballast draft is configured according to stability calculation requirements, mooring positioning installation is carried out with a shared anchor system which is installed in advance, and then the whole floating fan system is installed in place.

The floating type fan foundation suitable for deep and far sea installation is suitable for deep and far sea installation with the average water depth of 100 meters and more, is an economical semi-submersible type offshore floating type fan foundation, and has the advantages of good hydrodynamic performance, high typhoon resistance level, capability of carrying a fan with a large capacity of 16MW or more, strong anti-overturning capability, good stability, structural strength meeting the integrated design requirements of fan aerodynamics, hydrodynamics, mooring and the like, low steel structure weight of unit megawatt, high power generation efficiency, good economy and the like.

The above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modify equivalent embodiments using the technical content disclosed above without departing from the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (10)

1. A floating type fan foundation suitable for deep and open sea installation comprises a plurality of peripheral stand columns (2), a central stand column (3), a supporting member (5) and mooring chains (6), wherein the periphery of the central stand column is connected with the peripheral stand columns through the supporting member, and the floating type fan foundation is characterized in that:

the peripheral upright posts are obliquely arranged outwards and are divided into an upper section (2-1), a middle section (2-3) and a lower section (2-4) along the height direction of the peripheral upright posts, the cross sectional area of the middle section is larger than that of the lower section, the upper section is arranged above a water plane, the middle section is arranged in the water plane, and the lower section is arranged below the water plane;

the bottom of each peripheral upright post is arranged on a floating body (4) with a ballast tank arranged inside, the floating body is horizontally arranged, and the center of the floating body is vertically and crossly connected with the central upright post;

the floating body is of a Y-shaped structure with three branches, each branch comprises a connecting buoy (4-1) and one end of each connecting buoy of each branch of a heave buoy (4-2) which are connected into a whole, the other end of each connecting buoy is radiated outwards and connected with the heave buoy, the central upright post is connected with the connecting center of each connecting buoy, the peripheral upright posts are connected with the heave buoy, each branch, the peripheral upright posts and the supporting members mounted on the branch form a group of structures, each group of structures are independently arranged and connected with the central upright post into a whole, and the adjacent groups of structures are in 120-degree rotational symmetry or are symmetrical about the longitudinal section thereof.

2. A floating wind turbine foundation according to claim 1 wherein the angle of inclination of the perimeter columns is 15-30 °.

3. The floating fan foundation adapted for deep and open sea installation of claim 1, wherein the connecting pontoon is a rectangular pontoon, the heaving pontoon is a cylindrical pontoon, and the upper surfaces of the connecting pontoon and the heaving pontoon are configured as a platform.

4. A floating wind turbine foundation adapted for deep open sea installation according to claim 3 wherein the diameter of the heave pontoon is larger than the diameter of the perimeter columns.

5. Deep open sea installation adapted floating wind turbine foundation according to claim 1, wherein the support members comprise an upper support member (5-1) and a lower diagonal support member (5-2).

6. The floating fan foundation according to claim 1, wherein the middle section is connected to the upper section or the lower section via a transition section, and the cross-sectional area of the transition section is of a gradual change structure.

7. The deep open sea mounted floating wind turbine foundation of claim 1 wherein the mooring chains are suspended below the water level of the mid-section of the perimeter columns.

8. The deep open sea mounted floating wind turbine foundation of claim 1 wherein the lower portion of the mid section is within 3-5 meters below the water plane and the upper portion of the mid section is within 3 meters above the water plane.

9. A deep open sea installed floating wind turbine foundation as claimed in claim 1 wherein the diameter of the middle section is 1.2-1.8 times the diameter of the upper section or the lower section.

10. The floating type fan foundation suitable for deep open sea installation according to claim 1, wherein the central upright column comprises a first section, a second section, a third section and a fourth section which are sequentially arranged from top to bottom, the first section is a double-shell structure comprising an outer shell and an inner shell, the outer shell is connected with the supporting member, the upper end of the inner shell is connected with a fan tower, the lower end of the inner shell is connected with the upper end of the second section, the lower end of the second section is telescopically connected with the upper end of the third section, the lower end of the third section is connected with the fourth section, and the overall size of the fourth section is increased to form a buoy.

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