CN214998031U

CN214998031U - Floating type fan foundation

Info

Publication number: CN214998031U
Application number: CN202121050985.0U
Authority: CN
Inventors: 张黎; 白奇炜; 陈静
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2021-12-03
Anticipated expiration: 2031-05-17

Abstract

The utility model discloses a float formula fan basis, include: the foundation frame is of a V-shaped structure and is connected with the fan tower; the foundation frame floats in water and is used for supporting the fan tower so as to enable the fan tower to float on the water surface; the two ends of the cross supporting beam are respectively correspondingly connected with the two sides of the V shape of the basic frame, and the cross supporting beam and the basic frame form an A-shaped structure; the cross brace beam is used for stabilizing the base frame so as to enable the wind turbine tower to be in a stable state. The floating type fan foundation disclosed by the utility model is of an A-shaped structure and has better mechanical stability, so that the fan tower can stably float on the water surface; the utility model discloses well first stand and second stand adopt the concrete to pour into a mould, when guaranteeing to float formula fan foundation stability, can effectively practice thrift economic cost.

Description

Floating type fan foundation

Technical Field

The utility model relates to a marine wind power generation technical field especially relates to a showy formula fan basis that is A font.

Background

Wind turbine foundations in the global floating wind power industry are generally classified into a column foundation, a semi-submersible foundation, a barge foundation and the like. The technical maturity of the column foundation is the highest, and the column fan foundation is successfully and commercially applied to the deep water sea area by virtue of the excellent technical performance of the column fan foundation, for example, the Norwegian Hywind column foundation is successfully applied to a 30MW Hywind Scotland floating wind power project cooperatively developed by the American Masdar and the Norwegian national oil company. However, the traditional column type fan foundation represented by the norwegian Hywind column type foundation is not favored by the china market, and the main reason is that the transportation and installation process of the traditional column type fan foundation is complex, and the traditional column type fan foundation usually needs to be wet towed and righted on the sea and to finish fan hoisting on the sea, which has severe requirements on the water depth and the personnel skills of ports, navigation channels and wind power plants.

For the semi-submersible fan foundation, the fan can be towed to an operation place from a port by using a tugboat after the hoisting of the fan is finished at the port, and the requirement on the port is low; however, the manufacturing cost of the semi-submersible fan foundation is high, which is not beneficial to the popularization of the flat floating foundation. For example, a semi-submersible foundation represented by the american WindFloat fan foundation has a structure of all steel and needs to be provided with a plurality of truss tube structures, so that the steel cost is high; the ballast system is complex, and not only high-precision ballast water control system equipment is required, but also a large-capacity ballast pump and corresponding auxiliary equipment are required, so that the overall manufacturing cost of the semi-submersible foundation is high.

For barge type fan foundations, the material is usually reinforced concrete, so that the manufacturing cost is low; however, the draught of the barge type fan foundation is not ideal in power performance, the waterplane area is very large, the inherent period of the rolling and pitching motion of the barge type fan foundation is too short, the wave period cannot be avoided, frequent resonance is caused, the fatigue load of the fan foundation is too large, and the fault probability of the fan foundation is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a float formula fan basis, it is A font structure, has both had better mechanical stability and hydrodynamic performance, can effectively practice thrift economic cost again and the production of being convenient for.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

a floating wind turbine foundation comprising:

the foundation frame is of a V-shaped structure and is connected with the fan tower; the foundation frame floats in water and is used for supporting the fan tower so as to enable the fan tower to float on the water surface; and

two ends of the cross supporting beam are respectively correspondingly connected with two sides of the V shape of the basic frame, and the cross supporting beam and the basic frame form an A-shaped structure; the cross brace beam is used for stabilizing the base frame so as to enable the wind turbine tower to be in a stable state.

Preferably, the base frame comprises:

the first upright post is connected with the fan tower and used for supporting the fan tower;

the two second upright columns and the first upright column are arranged in a triangular mode and are used for providing buoyancy for the fan tower; and

one end of each bypass beam is connected with the first upright column, and the other end of each bypass beam is connected with the corresponding second upright column; and the two bypass beams form two V-shaped sides of the basic frame.

Preferably, the first upright comprises:

the first upper floating cylinder comprises a first end and a second end which are oppositely arranged, and the first end of the first upper floating cylinder is fixedly connected with the fan tower;

the first lower buoy is fixedly connected with the second end of the first upper buoy; and the outer side wall of the first lower buoy is also connected with the two bypass beams respectively.

Preferably, each of said second uprights comprises: a second upper buoy and a second lower buoy;

the second upper floating cylinder is arranged on the second lower floating cylinder;

the outer side wall of the second lower buoy is connected with the corresponding bypass beam;

the second upper floating cylinder and the first upper floating cylinder are positioned on the same horizontal plane; the second lower buoy and the first lower buoy are positioned on the same horizontal plane.

Preferably, the cross sections of the first upper buoy, the first lower buoy, the second upper buoy and the second lower buoy are all circular;

the radial diameter of the first upper buoy is smaller than that of the first lower buoy; the height of the first upper floating pontoon is greater than that of the first lower floating pontoon;

the radial diameter of the second upper buoy is smaller than that of the second lower buoy; and the height of the second upper buoy is greater than that of the second lower buoy.

Preferably, the two ends of the cross beam are respectively and correspondingly connected with the two bypass beams in a fixed mode, and the cross beam and the two bypass beams form an A-shaped structure.

Preferably, the floating wind turbine foundation further includes: a plurality of diagonal braces; one end of each inclined support rod is fixedly connected with the outer side wall of the first upper floating barrel, and the other end of each inclined support rod is fixedly connected with the corresponding outer side wall of the bypass beam and used for stabilizing the base frame.

Preferably, the floating wind turbine foundation further includes: a mooring system; one end of the mooring system is fixedly connected with the first upright post and the second upright post respectively, and the other end of the mooring system is fixedly connected with the seabed and used for fixing the foundation frame on the seabed so as to enable the fan tower to be in a stable state.

Preferably, the mooring system comprises: the first mooring device and a plurality of second mooring devices;

one end of the first mooring device is fixedly connected with the outer side wall of the first upper buoy, and the other end of the first mooring device is fixed on the seabed;

one end of each second mooring device is fixedly connected with the outer side wall of the corresponding second upper buoy, and the other end of each second mooring device is fixed on the seabed.

Preferably, the materials of the first upright column and the second upright column are both concrete;

the bypass beam, the cross brace beam and the diagonal brace are all made of steel.

Compared with the prior art, the utility model at least has one of following advantage:

the utility model provides a float formula fan basis, basic frame are V font structure, then can form A font structure through connecting spreader beam and basic frame to make float formula fan basis have better mechanical stability, and then make the fan pylon can float on the surface of water and be in the stable state.

The utility model discloses well first stand can link to each other with the second stand through the bypass roof beam, and first stand can also be connected with the bypass roof beam through the diagonal brace simultaneously to effectively strengthen basic frame's steadiness, make and float formula fan basis still have stronger structural reliability under great fan load effect.

The utility model discloses well first stand and second stand can adopt the concrete to pour into a mould, and other through beam, stull roof beam and diagonal brace can adopt steel material to prepare, both made basic frame have stronger bending resistance shear capacity, can also simplify basic frame's overall structure to and effectively reduce the steel volume of using in the basic frame, thereby when guaranteeing to float formula fan basic stability, can effectively practice thrift economic cost and be convenient for produce.

The utility model discloses well first pontoon and second pontoon down's radial diameter is great, can improve basic frame's the performance of swinging that hangs down, makes basic frame's waterline area moderate simultaneously, has great motion natural cycle to make floating fan basis can avoid most wave cycle, and then reduce the resonance effect of floating fan basis in the wave, make the hydrodynamic force performance preferred of floating fan basis.

The utility model discloses can assemble and install fan system at the pier after, whole wet dragging to marine wind field machine position and install mooring system and can carry out work, have transportation and simple to operate's characteristics.

Drawings

Fig. 1 is a schematic structural diagram of a floating wind turbine foundation according to an embodiment of the present invention;

fig. 2 is a schematic view of a connection structure between a bypass beam and a first upright of a floating wind turbine foundation according to an embodiment of the present invention;

fig. 3 is a schematic view of a connection structure between a diagonal brace and a first upright post of a floating fan foundation according to an embodiment of the present invention.

Detailed Description

The floating fan foundation provided by the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. To make the objects, features and advantages of the present invention more comprehensible, please refer to the attached drawings. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limitation of the implementation of the present invention, so that the present invention does not have the essential significance in the technology, and any modification of the structure, change of the ratio relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

As shown in the accompanying drawings 1-3, the present embodiment provides a floating type wind turbine foundation, including: a base frame 20 having a V-shaped structure and connected to the wind turbine tower 10; the base frame 20 floats in water and is used for supporting the fan tower 10 so that the fan tower 10 floats on the water surface; the two ends of the cross-brace beam 30 are respectively correspondingly connected with the two sides of the V-shaped of the base frame 20, and the cross-brace beam 30 and the base frame 20 form an A-shaped structure; the cross brace beams 30 are used to stabilize the base frame 20 so that the wind turbine tower 10 is in a steady state.

Referring to fig. 1 and fig. 2, the base frame 20 includes: a first upright 201 connected to the wind turbine tower 10 for supporting the wind turbine tower 10; two second columns 202 arranged in a triangular shape with the first column 201 for providing buoyancy to the wind turbine tower 10; one end of each bypass beam 203 is connected with the first upright column 201, and the other end of each bypass beam 203 is correspondingly connected with each second upright column 202; and two bypass beams 203 form two sides of the V-shape of the base frame 20.

It will be appreciated that in some other embodiments, the first upright 201 comprises: the first upper floating cylinder 2011 comprises a first end and a second end which are oppositely arranged, and the first end of the first upper floating cylinder 2011 is fixedly connected with the fan tower 10; a first lower buoy 2012 fixedly connected with a second end of the first upper buoy 2011; and the outer side wall of the first lower buoy 2012 is also connected with the two bypass beams 203 respectively.

In some embodiments, each of said second uprights 202 comprises: a second upper float 2021 and a second lower float 2022; the second upper float 2021 is arranged on the second lower float 2022; the outer side wall of the second lower buoy 2022 is connected with the corresponding bypass beam 203; the second upper floating cylinder 2021 and the first upper floating cylinder 2011 are positioned on the same horizontal plane; the second lower buoy 2022 is at the same level as the first lower buoy 2012.

Specifically, the first vertical column 201 and each second vertical column 202 may be connected by the corresponding bypass beam 203, so that the first vertical column 201 and each second vertical column 202 may receive loads such as gravity, shear force, bending moment, and torque transmitted by the wind turbine tower 10, so as to support the wind turbine tower 10; meanwhile, the first column 201 and each second column 202 may provide buoyancy for the wind turbine tower 10, so that the wind turbine tower 10 may float on the water surface, but the present invention is not limited thereto.

In this embodiment, a first end of the first upper float 2011 in the first upright 201 may be provided with a flange or the like, so as to be fixedly connected to the fan tower 10; the second end of first upper float barrel 2011 with first buoy 2012 can carry out fixed connection through first prestressing force rivet bolt 204, promptly first prestressing force rivet bolt 204 runs through insert behind the second end of first upper float barrel 2011 and end in first buoy 2012, thereby improve first upper float barrel 2011 with the reliability that first buoy 2012 is connected, and then improve the steadiness of first stand 201.

The second upper floating cylinder 2021 and the second lower floating cylinder 2022 in each second upright column 202 can also be fixedly connected by a second pre-stressed rivet, that is, the second pre-stressed rivet penetrates through one end of the second upper floating cylinder 2021 close to the bypass beam 203 and then is inserted into and stopped in the second lower floating cylinder 2022, so as to ensure the connection reliability of the second upper floating cylinder 2021 and the second lower floating cylinder 2022, and further improve the stability of each second upright column 202.

Specifically, in this embodiment, each of the bypass beams 203 includes a first end and a second end that are oppositely disposed, the first end of each of the bypass beams 203 may penetrate through the outer sidewall of the first lower pontoon 2012 of the first column 201 and then be inserted into and be stopped inside the first lower pontoon 2012, and the second end may penetrate through the outer sidewall of the second lower pontoon 2022 of the second column 202 and then be inserted into and be stopped inside the second lower pontoon 2022, so that the reliability of the connection between each of the bypass beams 203 and the first column 201 and each of the second column 202 may be enhanced while the first column 201 and each of the second column 202 are connected and supported. Each bypass beam 203 can transmit the structural internal force between the first upright 201 and the second upright 202, so that each second upright 202 can provide buoyancy to the first upright 201 and the wind turbine tower 10 fixedly connected with the first upright 201 through the corresponding bypass beam 203, and the first upright 201 can transmit the loads such as gravity, shear force, bending moment, torque and the like transmitted by the wind turbine tower 10 to each second upright 202 through the corresponding bypass beam 203, so that the force applied to the foundation frame 20 is uniform, the stability of the foundation frame 20 is enhanced, and the floating wind turbine foundation still has strong structural reliability under the action of a large wind turbine load; in addition, the bypass beam 203 can also effectively improve the heave performance of the base frame 20. Preferably, the bypass beam 203 may adopt a box structure, but the present invention is not limited thereto.

With continued reference to fig. 1, the first upper float 2011, the first lower float 2012, the second upper float 2021 and the second lower float 2022 are all circular in cross-section; the radial diameter of the first upper float 2011 is smaller than the radial diameter of the first lower float 2012; and the height of the first upper buoy 2011 is greater than the height of the first lower buoy 2012; the radial diameter of the second upper float 2021 is smaller than that of the second lower float 2022; and the height of the second upper float 2021 is greater than that of the second lower float 2022.

Specifically, in this embodiment, the radial diameter of the first lower buoy 2012 is greater than the radial diameter of the first upper buoy 2011, so as to improve the heave performance of the first vertical column 201, and the radial diameter of the second lower buoy 2022 is greater than the radial diameter of the second upper buoy 2021, so as to improve the heave performance of the second vertical column 202; by improving the heave performance of the first and

second columns

201, 202, the heave performance of the entire foundation frame 20 may be improved, such that the wind turbine tower 10 may be in a steady state. In addition, first pontoon 2012 and second pontoon 2022 down can also make the waterline area of basic frame 20 is moderate, has great inherent cycle of motion, thereby makes most wave cycle can be avoided to floating fan basis, and then reduces the resonance effect of floating fan basis in the wave makes the hydrodynamic force performance preferred on floating fan basis, but the utility model discloses do not use this as the limit.

Referring to fig. 1, two ends of the cross-brace beam 30 are respectively and correspondingly fixedly connected to the two bypass beams 203, and the cross-brace beam 30 and the two bypass beams 203 form an a-shaped structure.

Specifically, in this embodiment, the cross-brace beam 30 may adopt a box structure, and the cross-brace beam 30 may be located in the V-shaped included angle of the base frame 20, namely, two in the included angle of the bypass beam 203, so that the cross-brace beam 30 and two the bypass beam 203 may be arranged in a shape of a letter a. The cross-brace beam 30 can effectively transmit two structural internal forces between the bypass beams 203, so that the stress of the base frame 20 is even, thereby enhancing the stability of the base frame 20, but the utility model discloses not limit to this.

Referring to fig. 1 and fig. 3, the floating wind turbine foundation further includes: a plurality of diagonal braces 40; one end of each diagonal brace 40 is fixedly connected with the outer side wall of the first upper floating barrel 2011, and the other end of each diagonal brace is fixedly connected with the outer side wall of the corresponding bypass beam 203, so as to stabilize the base frame 20.

Specifically, in the present embodiment, the number of the diagonal brace 40 and the bypass beam 203 may be the same, the number of the diagonal brace 40 is two, and each diagonal brace 40 may be a tubular structure. More specifically, a steel ring 2013 may be disposed on an outer sidewall of the first upper floating cylinder 2011, and one end of each diagonal brace 40 may be welded to the steel ring 2013, and the other end of each diagonal brace 40 may be welded to an outer sidewall of the corresponding bypass beam 203, so that each diagonal brace 40 may transmit and share a structural internal force between the first upper floating cylinder 2011 and the corresponding bypass beam 203, and thus the force applied to the base frame 20 is uniform, and the stability of the base frame 20 is further enhanced. Preferably, the two diagonal braces 40 and the cross brace 30 may be arranged in a triangle to further enhance the stability of the base frame 20, but the present invention is not limited thereto.

With continued reference to fig. 1, the floating wind turbine foundation further includes: a mooring system; one end of the mooring system is fixedly connected to the first upright 201 and the second upright 202, and the other end is fixedly connected to the seabed, so as to fix the base frame 20 to the seabed, so that the wind turbine tower 10 is in a stable state.

It will be appreciated that in some other embodiments, the mooring system comprises: a first mooring 501 and a number of second mooring 502; one end of the first mooring device 501 is fixedly connected with the outer side wall of the first floating barrel 2011, and the other end of the first mooring device is fixed on the seabed; one end of each second mooring device 502 is correspondingly and fixedly connected with the outer side wall of each second buoy 2021, and the other end is fixed on the seabed.

Specifically, in this embodiment, the number of the second mooring devices 502 and the number of the second columns 202 may be kept the same, and then the number of the second mooring devices 502 is two. More specifically, the first mooring device 501 and the second mooring device 502 may be steel cables or composite cables, and the first mooring device 501 and the second mooring device 502 may be fixed on the seabed by anchoring, but the present invention is not limited thereto.

With continued reference to fig. 1 and 2, the material of the first upright 201 and the second upright 202 is concrete; the bypass beam 203, the cross-brace beam 30 and the diagonal brace 40 are all made of steel.

Specifically, in this embodiment, the first upright column 201 and the second upright column 202 may be cast by using concrete, and the bypass beam 203, the cross-brace beam 30, and the diagonal brace 40 may be made of steel materials, so that the base frame 20 has strong bending resistance and shearing resistance, the overall structure of the base frame 20 can be simplified, and the amount of steel used in the base frame 20 is effectively reduced, thereby ensuring the stability of the floating wind turbine foundation, effectively saving economic cost, and facilitating production. More specifically, after the first end of each bypass beam 203 is inserted into the casting mold of the first lower buoy 2012, concrete is poured, so that the first end of each bypass beam 203 can be inserted into the first lower buoy 2012 made of concrete; the second end of each bypass beam 203 is inserted into the casting mold of the second lower buoy 2022, and then concrete is poured, so that the second end of each bypass beam 203 can be inserted into the second lower buoy 2022 made of concrete, thereby effectively enhancing the reliability of connection between each bypass beam 203 and the first column 201 and the second column 202, but the invention is not limited thereto.

In summary, the embodiment provides a floating type wind turbine foundation, in which a V-shaped foundation frame is used to support a wind turbine tower, so that the wind turbine tower floats on the water surface; a-shaped structure can be formed by connecting the cross brace beam and the basic frame to stabilize the basic frame, so that the floating type fan foundation has good mechanical stability, and the fan tower can be in a stable state. In the embodiment, the first upright column is connected with the second upright column through the bypass beam, and the first upright column is connected with the bypass beam through the inclined support rod, so that the stability of the foundation frame can be effectively enhanced, and the floating type fan foundation still has strong structural reliability under the action of a large fan load; meanwhile, the first stand column and the second stand column are poured by concrete, the bypass beam and the cross-bracing beam are made of steel materials, so that the stability of the foundation of the floating type fan can be guaranteed, the economic cost is effectively saved, and the production is convenient. In addition, the embodiment also has the characteristics of better hydrodynamic performance and convenience in transportation and installation.

While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.

Claims

1. A floating fan foundation, comprising:

a base frame (20) having a V-shaped structure and connected to the wind turbine tower (10); the foundation frame (20) floats in water and is used for supporting the fan tower (10) so that the fan tower (10) floats on the water surface; and

the two ends of the cross supporting beam (30) are respectively correspondingly connected with the two sides of the V shape of the basic frame (20), and the cross supporting beam (30) and the basic frame (20) form an A-shaped structure; the cross brace beams (30) are used to stabilize the base frame (20) so that the wind turbine tower (10) is in a steady state.

2. A floating wind turbine foundation according to claim 1 wherein the foundation frame (20) comprises:

a first upright (201) connected to the wind turbine tower (10) for supporting the wind turbine tower (10);

two second uprights (202) arranged in a triangular configuration with the first upright (201) for providing buoyancy to the wind turbine tower (10); and

two bypass beams (203), wherein one end of each bypass beam (203) is connected with the first upright column (201), and the other end of each bypass beam is connected with the corresponding second upright column (202); and the two bypass beams (203) form two V-shaped sides of the basic frame (20).

3. A floating wind turbine foundation according to claim 2 wherein the first upright (201) comprises:

the first upper buoy (2011) comprises a first end and a second end which are arranged oppositely, and the first end of the first upper buoy is fixedly connected with the fan tower (10);

a first lower buoy (2012) fixedly connected with a second end of the first upper buoy (2011); and the outer side wall of the first lower buoy (2012) is also connected with the two bypass beams (203) respectively.

4. A floating wind turbine foundation according to claim 3 wherein each of said second columns (202) comprises: a second upper pontoon (2021) and a second lower pontoon (2022);

the second upper pontoon (2021) is arranged on the second lower pontoon (2022);

the outer side wall of the second lower buoy (2022) is connected with the corresponding bypass beam (203);

the second upper buoy (2021) is positioned on the same horizontal plane as the first upper buoy (2011); the second lower pontoon (2022) is at the same level as the first lower pontoon (2012).

5. A floating wind turbine foundation according to claim 4 wherein,

the cross sections of the first upper buoy (2011), the first lower buoy (2012), the second upper buoy (2021) and the second lower buoy (2022) are all circular;

-the radial diameter of the first upper buoy (2011) is smaller than the radial diameter of the first lower buoy (2012); and the height of the first upper buoy (2011) is greater than the height of the first lower buoy (2012);

the radial diameter of the second upper pontoon (2021) is smaller than the radial diameter of the second lower pontoon (2022); and the height of the second upper buoy (2021) is greater than the height of the second lower buoy (2022).

6. A floating wind turbine foundation according to claim 2 wherein,

the two ends of the cross support beam (30) correspond to the two bypass beams (203) respectively and are fixedly connected, and the cross support beam (30) and the two bypass beams (203) form an A-shaped structure.

7. A floating wind turbine foundation according to claim 3 further comprising: a plurality of diagonal braces (40); one end of each inclined supporting rod (40) is fixedly connected with the outer side wall of the first upper buoy (2011), and the other end of each inclined supporting rod is fixedly connected with the corresponding outer side wall of the bypass beam (203) and used for stabilizing the base frame (20).

8. A floating wind turbine foundation according to claim 4 further comprising: a mooring system; one end of the mooring system is fixedly connected with the first upright post (201) and the second upright post (202), and the other end of the mooring system is fixedly connected with the seabed, and the mooring system is used for fixing the base frame (20) on the seabed so as to enable the wind turbine tower (10) to be in a stable state.

9. A floating wind turbine foundation according to claim 8 wherein said mooring system comprises: a first mooring means (501) and a number of second mooring means (502);

one end of the first mooring device (501) is fixedly connected with the outer side wall of the first upper buoy (2011), and the other end of the first mooring device is fixed on the seabed;

one end of each second mooring device (502) is fixedly connected with the outer side wall of the corresponding second upper buoy (2021), and the other end of each second mooring device is fixed on the seabed.

10. A floating wind turbine foundation according to claim 7 wherein,

the materials of the first upright post (201) and the second upright post (202) are both concrete;

the bypass beam (203), the cross brace beam (30) and the inclined brace rod (40) are all made of steel.