Offshore floating foundation and offshore floating type power generation assembly with same

Abstract

The invention provides an offshore floating foundation and an offshore floating type power generation assembly with the same, and the upper floating foundation comprises an upper floating body which is used for floating on the sea surface and is provided with a power generation structure; the lower floating body is arranged below the upper floating body, the lower floating body comprises a first floating block and a load adjusting structure, the first floating block is provided with a hollow cavity, the load adjusting structure is arranged in the hollow cavity, and the load adjusting structure can change the weight of the lower floating body, so that the lower floating body has a floating position for supporting the upper floating body and an anchoring position for sinking into the seabed; and the lifting structure is arranged between the upper floating body and the lower floating body and can release or retract the lower floating body. According to the technical scheme, the problems that in the prior art, a catenary mooring mode is large in sea area and high in installation cost can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore power generation, and in particular to an offshore floating foundation and an offshore floating power generation assembly having the same. Background Art

[0002] Offshore wind power and offshore photovoltaic power will inevitably adopt floating technology to go to deep sea. However, most of the current floating bodies adopt catenary mooring, which requires a large sea area and has high mooring installation costs. It is urgent to develop new low-cost floating body technology to promote the development of offshore wind power and offshore photovoltaic power in my country to go to deep sea. Summary of the invention

[0003] The main purpose of the present invention is to provide an offshore floating foundation and an offshore floating power generation assembly having the same, so as to solve the problems of large sea area and high installation cost in the catenary mooring method in the related art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an offshore floating foundation, comprising: an upper floating body, used to float on the sea surface and install a power generation structure; a lower floating body, arranged below the upper floating body, the lower floating body comprising a first floating block and a load adjustment structure, the first floating block having a hollow cavity, the load adjustment structure being arranged in the hollow cavity, the load adjustment structure being capable of changing the weight of the lower floating body so that the lower floating body has a floating position supporting the upper floating body and an anchored position sunk to the seabed; a lifting structure, arranged between the upper floating body and the lower floating body and capable of releasing or retracting the lower floating body.

[0005] Furthermore, the lower floating body includes a plurality of first floating blocks, which are arranged in a surrounding manner. The lower floating body also includes a plurality of first connecting frames, and a first connecting frame is arranged between each two adjacent first floating blocks.

[0006] Furthermore, the load adjustment structure includes a water pump, a water storage chamber, and a pipeline connected between the water pump and the water storage chamber. The water pump can inject seawater into the water storage chamber and pump seawater out of the water storage chamber.

[0007] Furthermore, the first connecting frame includes a plurality of connecting cross bars connecting two adjacent first floating blocks, and a connecting vertical bar and a connecting diagonal bar are arranged between each two adjacent connecting cross bars. The connecting vertical bar and the connecting diagonal bar are staggered to form a plurality of triangular support frames with the two connecting cross bars.

[0008] Furthermore, the lifting structure includes a winding part and a connecting rope, the winding part is arranged on the upper floating body, the first end of the connecting rope is wound on the winding part, the second end of the connecting rope is connected to the lower floating body, and the winding part is rotatably arranged to control the release length of the connecting rope.

[0009] Furthermore, the lifting structure also includes a rotating motor, and the winding part is connected to the output shaft of the rotating motor and rotates synchronously with the output shaft.

[0010] Furthermore, the winding part and the rotating motor are installed above the upper floating body, and the lifting structure also includes a protective cover arranged above the upper floating body and covering the outer sides of the winding part and the rotating motor.

[0011] Furthermore, the upper floating body includes a plurality of second floating blocks and a plurality of second connecting frames, the plurality of second floating blocks are arranged in one-to-one correspondence with the plurality of first floating blocks, and the plurality of second connecting frames are arranged in one-to-one correspondence with the plurality of first connecting frames.

[0012] Furthermore, the upper floating body also includes a supporting column and a plurality of oblique struts, the power generation structure is installed above the supporting column, and each oblique strut is connected between the supporting column and a second floating block.

[0013] According to another aspect of the present invention, there is provided an offshore floating power generation assembly, comprising an offshore floating foundation and a power generation structure arranged on the offshore floating foundation, wherein the offshore floating foundation is the offshore floating foundation mentioned above.

[0014] By applying the technical solution of the present invention, the offshore floating foundation includes an upper buoy, a lower buoy and a lifting structure, wherein the upper buoy is used to float on the sea surface and install a power generation structure. The lower buoy has a load-adjusting structure, which can adjust the weight of the lower buoy. When the offshore floating foundation needs to be assembled, the lower buoy is adjusted to a light weight state through the load-adjusting structure, so that the lower buoy is in a floating position floating on the sea surface. At this time, the lower buoy can be used to support the upper buoy. The staff can assemble the upper buoy, the lower buoy and the lifting structure together, and then drag the offshore floating foundation to the target sea area. After arriving at the target sea area, the lower buoy is adjusted to a heavy weight state through the load-adjusting structure, so that the lower buoy sinks and finally sinks to the bottom of the sea. When the anchoring position is reached, the lower buoy is released by the lifting structure during the sinking process of the lower buoy, so that only the lower buoy sinks, and the upper buoy can float on the sea surface under the action of its own buoyancy without being driven to sink by the lower buoy. At this time, the lower buoy is anchored to the seabed, and the lifting structure is connected between the two to play the role of mooring, so that the upper buoy can be moored in the target sea area, omitting the mooring catenary arranged in the sea along the oblique direction in the related technology, saving the sea area; and there is no need to set up anchoring structures such as pile anchors, suction, and drag anchors, saving the cost of the mooring system. In addition, when it is necessary to install and move the offshore floating foundation, it is only necessary to adjust the weight of the lower buoy through the load adjustment structure and use tools such as tugboats to drag the offshore floating foundation. The operation is simple and fast, and can effectively reduce the installation cost. Therefore, the technical solution of the present application can effectively solve the problem of large sea area and high installation cost of the catenary mooring method in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of a three-dimensional structure of an embodiment of an offshore floating foundation according to the present invention is shown, wherein the lower floating body is in a floating position;

[0017] Figure 2 Shows Figure 1 A schematic diagram of the three-dimensional structure of an offshore floating foundation, wherein the lower buoy is in an anchoring position;

[0018] Figure 3 Shows Figure 2 A magnified view of a portion of the structure of an offshore floating foundation;

[0019] Figure 4 Shows Figure 1 A schematic cross-sectional view of the lifting structure of an offshore floating foundation.

[0020] The above drawings include the following reference numerals:

[0021] 10. upper floating body; 11. second floating block; 12. second connecting frame; 13. supporting column; 14. oblique support rod;

[0022] 20, lower floating body; 21, first floating block; 22, first connecting frame; 221, connecting cross bar; 222, connecting vertical bar; 223, connecting diagonal bar;

[0023] 30. Lifting structure; 31. Winding part; 32. Connecting rope; 33. Rotating motor; 34. Protective cover. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] like Figures 1 to 4 As shown, the present application provides an offshore floating foundation, and the embodiment of the offshore floating foundation of the present application includes: an upper floating body 10, a lower floating body 20 and a lifting structure 30. Among them, the upper floating body 10 is used to float on the sea surface and install a power generation structure; the lower floating body 20 is arranged below the upper floating body 10, and the lower floating body 20 includes a first floating block 21 and a load adjustment structure, the first floating block 21 has a hollow cavity, the load adjustment structure is arranged in the hollow cavity, and the load adjustment structure can change the weight of the lower floating body 20, so that the lower floating body 20 has a floating position supporting the upper floating body 10 and an anchoring position sunk to the seabed; the lifting structure 30 is arranged between the upper floating body 10 and the lower floating body 20 and can release or retract the lower floating body 20.

[0028] Using the technical solution of this embodiment, the offshore floating foundation includes an upper floating body 10, a lower floating body 20 and a lifting structure 30, wherein the upper floating body 10 is used to float on the sea surface and install a power generation structure. The lower floating body 20 has a load-adjusting structure, which can adjust the weight of the lower floating body 20. When it is necessary to assemble the offshore floating foundation, the lower floating body 20 is adjusted to a light weight state through the load-adjusting structure, so that the lower floating body 20 is in a floating position floating on the sea surface. At this time, the lower floating body 20 can be used to support the upper floating body 10. The staff can assemble the upper floating body 10, the lower floating body 20 and the lifting structure 30 together, and then drag the offshore floating foundation to the target sea area; after arriving at the target sea area, the lower floating body 20 is adjusted to a heavy weight state through the load-adjusting structure, so that the lower floating body 20 sinks and finally sinks into the sea. When the bottom reaches the anchoring position, the lower buoy 20 is released by the lifting structure 30 during the sinking process of the lower buoy 20, so that only the lower buoy 20 sinks, and the upper buoy 10 can float on the sea surface under the action of its own buoyancy without being driven to sink by the lower buoy 20. At this time, the lower buoy 20 is anchored on the seabed, and the lifting structure 30 is connected between the two to play the role of mooring, so as to realize the mooring of the upper buoy 10 in the target sea area, omitting the mooring catenary arranged in the sea along the oblique direction in the related technology, saving the sea area; and there is no need to set up anchoring structures such as pile anchors, suction, and drag anchors, saving the cost of the mooring system. In addition, when it is necessary to install and move the offshore floating foundation, it is only necessary to adjust the weight of the lower buoy 20 through the load adjustment structure and use tools such as tugboats to drag the offshore floating foundation. The operation is simple and fast, and the installation cost can be effectively reduced. Therefore, the technical solution of this embodiment can effectively solve the problem of large sea area and high installation cost of the catenary mooring method in the related technology.

[0029] like Figures 1 to 3 As shown, the lower floating body 20 includes a plurality of first floating blocks 21, and the plurality of first floating blocks 21 are arranged around. The lower floating body 20 also includes a plurality of first connecting frames 22, and a first connecting frame 22 is arranged between each two adjacent first floating blocks 21. The lower floating body 20 is composed of a plurality of first floating blocks 21 and a plurality of first connecting frames 22. The first floating blocks 21 and the first connecting frames 22 can be processed separately, and finally the first floating blocks 21 and the first connecting frames 22 are assembled together, which reduces the manufacturing difficulty of the lower floating body 20, and further reduces the manufacturing cost of the lower floating body 20.

[0030] In this embodiment, the load adjustment structure includes a water pump, a water storage chamber, and a pipeline connected between the water pump and the water storage chamber. The water pump can inject seawater into the water storage chamber and pump seawater out of the water storage chamber. The weight of the lower floating body 20 is adjusted by injecting seawater into the water storage chamber or pumping seawater out of the water storage chamber by the water pump. Local materials can be used without the need to prepare other ballast structures or manually place ballast structures. The weight of the lower floating body 20 can be adjusted by controlling the working state of the water pump, which simplifies the control operation of the staff.

[0031] like Figure 2 and Figure 3 As shown, the first connecting frame 22 includes a plurality of connecting cross bars 221 connecting two adjacent first floating blocks 21, and a connecting vertical bar 222 and a connecting diagonal bar 223 are arranged between each two adjacent connecting cross bars 221. The connecting vertical bars 222 and the connecting diagonal bars 223 are arranged alternately to form a plurality of triangular support frames with the two connecting cross bars 221. Specifically, in the present embodiment, the first connecting frame 22 includes three connecting cross bars 221, and the three connecting cross bars form a triangular prism-shaped structure. A connecting vertical bar 222 and two connecting diagonal bars 223 are arranged between each two adjacent connecting cross bars 221, and the connecting vertical bar 222 is connected to the middle position of the two connecting cross bars 221, and the two connecting diagonal bars 223 are located on both sides of the connecting vertical bar 222, and together with the two connecting cross bars 221, four triangular support frames are formed, thereby ensuring the support strength of the first connecting frame 22.

[0032] like Figure 2 and Figure 4 As shown, the lifting structure 30 includes a winding portion 31 and a connecting rope 32. The winding portion 31 is arranged on the upper floating body 10, the first end of the connecting rope 32 is wound on the winding portion 31, and the second end of the connecting rope 32 is connected to the lower floating body 20. The winding portion 31 is rotatably arranged to control the release length of the connecting rope 32. The lower floating body 20 is released or retracted by the winding portion 31 in cooperation with the connecting rope 32, which has the advantages of simple structure and easy control. When the lower floating body 20 is located at the anchoring position, the connecting rope 32 is in a tensioned state, and the connecting rope 32 plays the role of a mooring cable, so that the upper floating body 10 is moored in the target sea area.

[0033] like Figure 4 As shown, the lifting structure 30 also includes a rotating motor 33, and the winding part 31 is connected to the output shaft of the rotating motor 33 and rotates synchronously with the output shaft. The rotating motor 33 drives the winding part 31 to rotate, thereby releasing or recovering the connecting rope 32, which has the advantages of simple structure and easy control.

[0034] like Figure 2 and Figure 4As shown, the winding part 31 and the rotating motor 33 are installed above the upper floating body 10, and the lifting structure 30 also includes a protective cover 34 arranged above the upper floating body 10 and covering the outer side of the winding part 31 and the rotating motor 33. The main part of the lifting structure 30 (the winding part 31 and the rotating motor 33) is arranged above the upper floating body 10, which is convenient for maintaining the rotating motor 33. The protective cover 34 is arranged on the outer side of the winding part 31 and the rotating motor 33 to protect the winding part 31 and the rotating motor 33.

[0035] In this embodiment, a control panel is also provided in the protective cover 34, and the control panel is used to control the working state of the rotating motor 33. During operation, the control panel and the rotating motor 33 are structures that are prone to failure. The two are arranged together above the upper floating body 10, which makes it convenient for the staff to open the protective cover 34 to maintain the rotating motor 33 and the control panel, thereby reducing the difficulty of subsequent maintenance.

[0036] like Figure 1 and Figure 2 As shown, the upper floating body 10 includes a plurality of second floating blocks 11 and a plurality of second connecting frames 12, wherein the plurality of second floating blocks 11 are arranged in one-to-one correspondence with the plurality of first floating blocks 21, and the plurality of second connecting frames 12 are arranged in one-to-one correspondence with the plurality of first connecting frames 22. The upper floating body 10 is composed of the plurality of second floating blocks 11 and the plurality of second connecting frames 12, and the second floating blocks 11 and the second connecting frames 12 can be processed separately, and finally the second floating blocks 11 and the second connecting frames 12 are assembled together, which reduces the manufacturing difficulty of the upper floating body 10, and further reduces the manufacturing cost of the upper floating body 10. In addition, the plurality of second floating blocks 11 and the plurality of first floating blocks 21 are arranged in one-to-one correspondence, and the plurality of second connecting frames 12 and the plurality of first connecting frames 22 are arranged in one-to-one correspondence, which can ensure that when assembling the offshore floating foundation and when the position of the offshore floating foundation needs to be adjusted, the lower floating body 20 can stably float on the sea surface and stably form the upper floating body 10.

[0037] like Figure 1 and Figure 2 As shown, the structure of the second connecting frame 12 is similar to that of the first connecting frame 22, and will not be described in detail herein.

[0038] In this embodiment, the upper floating body 10 includes three second floating blocks 11 and three second connecting frames 12 , and the lower floating body 20 includes three first floating blocks 21 and three first connecting frames 22 .

[0039] like Figure 1 and Figure 2As shown, the upper floating body 10 further includes a supporting column 13 and a plurality of oblique struts 14. The power generation structure is installed above the supporting column 13, and each oblique strut 14 is connected between the supporting column 13 and a second floating block 11. The supporting column 13 and the plurality of second floating blocks 11 are connected by a plurality of oblique struts 14, which has the advantage of a simple structure.

[0040] like Figure 4 As shown, the winding portion 31 and the rotating motor 33 are both arranged on the upper surface of the supporting column 13, and the lifting structure 30 also includes a motor base arranged on the upper surface of the supporting column 13, and the rotating motor is installed on the motor base.

[0041] like Figure 2 As shown, in this embodiment, the lifting structure 30 includes three groups of winding parts 31, connecting ropes 32 and rotating motors 33, and the three winding parts 31 and the three rotating motors 33 are arranged on the upper surface of the supporting column 13. The supporting column 13 and the oblique support rod 14 are both hollow tubular structures, and the connecting rope 32 passes downward through the upper surface of the supporting column 13 and penetrates into the supporting column 13 and the corresponding oblique support rod 14 and the second floating block 11, and finally passes downward from the second floating block 11 and connects to the corresponding first floating block 21.

[0042] In the present embodiment, the first connecting frame 22 and the second connecting frame 12 are also formed by splicing hollow tubular structures.

[0043] During the construction process, the upper buoy 10 and the lower buoy 20 are constructed separately. After the construction is completed, the lower buoy 20 is placed on the sea surface of the dock, so that the lower buoy 20 is in a light weight state. The lower buoy 20 can float stably on the dock by relying on its own large buoyancy. Then the upper buoy 10 is hoisted above the lower buoy 20, and the connecting rope 32 is connected to the first floating block 21 of the lower buoy 20. Since the buoyancy of the lower buoy 20 is large, it can be ensured that after the upper buoy 10 is hoisted on the lower buoy 20, the entire offshore floating foundation can float on the water surface (such as Figure 1 As shown). At this time, the floating foundation can be wet-towed by a tugboat to the target sea area. When arriving at the target sea area, the water pump is used to pump seawater into the water storage chamber, so that the weight of the lower floating body 20 slowly increases, and the rotating motor 33 controls the winding part 31 to slowly release the connecting rope 32. Under the action of gravity, the lower floating body 20 sinks to the seabed, and the upper floating body 10 and the lower floating body 20 gradually separate. Finally, the lower floating body 20 is fixed on the seabed because its own gravity is greater than the buoyancy (as shown in the figure). Figure 2 As shown). At this time, the floating body 10 floats on the water surface by its own buoyancy. The draft of the floating body 10 can be controlled by adjusting the release length of the connecting rope 32, ensuring that the connecting rope 32 is always in a tensioned state during the working process, playing the role of a mooring cable, and mooring the floating body 10 in the target sea area.

[0044] When the offshore floating foundation needs to be moved, the seawater in the first floating block 21 is discharged, the weight of the lower floating body 20 is gradually reduced, and the connecting rope 32 is tightened at the same time. Under the dual effects of buoyancy and the tension of the connecting rope 32, the lower floating body 20 is lifted to the upper position. Figure 1 The floating foundation is then towed to another location using a tugboat.

[0045] The present application also provides an offshore floating power generation assembly. The offshore floating power generation assembly of this embodiment includes an offshore floating foundation and a power generation structure arranged on the offshore floating foundation, wherein the offshore floating foundation is the above-mentioned offshore floating foundation. The above-mentioned offshore floating foundation can effectively solve the problem of large sea area and high installation cost of the catenary mooring method in the related technology. The offshore floating power generation assembly with the above-mentioned offshore floating foundation also has the above-mentioned advantages.

[0046] The power generation structure may be a wind turbine, a photovoltaic module, etc. The power generation structure is installed above the protective cover 34. The protective cover 34 includes a cover plate, and an opening structure is provided on the side wall of the cover body. The cover plate can be opened and closed at the opening structure. When the lifting structure needs to be maintained, the cover plate can be opened to expose the control panel, the rotating motor 33 and other structures inside the protective cover 34.

[0047] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0049] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An offshore floating foundation, characterized in that: include: A floating body (10) is used to float on the sea surface and install a power generation structure; A lower floating body (20) is arranged below the upper floating body (10), the lower floating body (20) comprising a first floating block (21) and a load adjustment structure, the first floating block (21) having a hollow cavity, the load adjustment structure being arranged in the hollow cavity, the load adjustment structure being capable of changing the weight of the lower floating body (20) so that the lower floating body (20) has a floating position supporting the upper floating body (10) and an anchoring position sunk to the seabed; A lifting structure (30) is arranged between the upper floating body (10) and the lower floating body (20) and is capable of releasing or retracting the lower floating body (20).

2. The offshore floating foundation according to claim 1, characterized in that: The lower floating body (20) comprises a plurality of the first floating blocks (21), and the plurality of the first floating blocks (21) are arranged in a surrounding manner. The lower floating body (20) further comprises a plurality of first connecting frames (22), and one first connecting frame (22) is arranged between each two adjacent first floating blocks (21).

3. The offshore floating foundation according to claim 1, characterized in that: The load adjustment structure comprises a water pump, a water storage chamber and a pipeline connected between the water pump and the water storage chamber. The water pump can inject seawater into the water storage chamber and extract seawater from the water storage chamber.

4. The offshore floating foundation according to claim 2, characterized in that: The first connecting frame (22) comprises a plurality of connecting cross bars (221) connecting two adjacently arranged first floating blocks (21), a connecting vertical bar (222) and a connecting diagonal bar (223) are arranged between each two adjacently arranged connecting cross bars (221), and the connecting vertical bars (222) and the connecting diagonal bars (223) are arranged alternately to form a plurality of triangular support frames with the two connecting cross bars (221).

5. The offshore floating foundation according to any one of claims 1 to 4, characterized in that: The lifting structure (30) comprises a winding portion (31) and a connecting rope (32), wherein the winding portion (31) is arranged on the upper floating body (10), the first end of the connecting rope (32) is wound on the winding portion (31), the second end of the connecting rope (32) is connected to the lower floating body (20), and the winding portion (31) is rotatably arranged to control the release length of the connecting rope (32).

6. The offshore floating foundation according to claim 5, characterized in that: The lifting structure (30) also includes a rotating motor (33), and the winding portion (31) is connected to an output shaft of the rotating motor (33) and rotates synchronously with the output shaft.

7. The offshore floating foundation according to claim 6, characterized in that: The winding portion (31) and the rotating motor (33) are installed above the upper floating body (10), and the lifting structure (30) also includes a protective cover (34) arranged above the upper floating body (10) and covering the outer sides of the winding portion (31) and the rotating motor (33).

8. The offshore floating foundation according to claim 2 or 4, characterized in that: The upper floating body (10) comprises a plurality of second floating blocks (11) and a plurality of second connecting frames (12), wherein the plurality of second floating blocks (11) are arranged in a one-to-one correspondence with the plurality of first floating blocks (21), and the plurality of second connecting frames (12) are arranged in a one-to-one correspondence with the plurality of first connecting frames (22).

9. The offshore floating foundation according to claim 8, characterized in that: The upper floating body (10) further comprises a supporting column (13) and a plurality of oblique struts (14); the power generation structure is installed above the supporting column (13); and each of the oblique struts (14) is connected between the supporting column (13) and one of the second floating blocks (11).

10. An offshore floating power generation assembly, comprising an offshore floating foundation and a power generation structure arranged on the offshore floating foundation, characterized in that: The offshore floating foundation is the offshore floating foundation according to any one of claims 1 to 9.

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