CN212605699U

CN212605699U - Migratable offshore wind power floating foundation

Info

Publication number: CN212605699U
Application number: CN202020398026.7U
Authority: CN
Inventors: 刘润; 蔡润博; 练继建
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2021-02-26
Anticipated expiration: 2030-03-25

Abstract

The utility model discloses a migratory offshore wind power floating foundation, which comprises an offshore wind power floating foundation, a floating platform and a mooring system, wherein the floating platform combines a stand column with a small water plane and a floating box with a large water plane, thereby ensuring the stability of the foundation; the anchoring foundation provides uplift resistance by using the pressure load and the frictional resistance provided by the skirt plate, the center can be filled with sand for ballast, the structure with the skirt plate at the lower part can be towed to an operation water area, and the anchoring foundation can penetrate into a seabed through heaping and internal and external pressure difference, so that the construction is convenient; the floating foundation can float to the sea surface through the buoyancy of the anchoring foundation, the floating foundation of offshore wind power can be moved conveniently, the fan can be repeatedly used in multiple places, meanwhile, the floating box and the inside of the anchoring foundation are divided into a plurality of sub-cabins through the sub-cabin plates, in the installation, operation and dismantling processes, the gravity center and the floating center position of the floating foundation of offshore wind power can be adjusted through the sub-cabin chambers, the structural posture is controlled, and construction and operation are facilitated.

Description

Migratable offshore wind power floating foundation

Technical Field

The utility model belongs to marine wind power basis field relates to a migratable marine wind power floating basis particularly.

Background

With the continuous consumption of petroleum, the energy crisis is increasingly prominent, and offshore wind energy is a renewable clean energy and becomes a new direction for relieving the situation of global energy shortage. An offshore wind turbine installed in a shallow water area generally uses a fixed foundation, and in a deep sea area, considering that the strength of various environmental loads such as waves, ocean currents, sea winds, internal waves and the like is greatly enhanced compared with that of the offshore wind turbine, the construction and installation costs of a traditional fixed foundation become very expensive, so that a floating foundation becomes an effective solution to the deepwater problem.

At present, offshore wind power floating foundations mainly comprise three types, which are respectively: semi-submersible, Spar, and TLP type floating foundations. The semi-submersible floating foundation body is composed of a plurality of upright columns and floating cylinders, and positioning is completed through a mooring system. The stand interval is great for the moment of reaction is great, does benefit to and improves structural stability. However, the buoy of the semi-submersible type floating foundation below the water line surface has larger dimension, and is subjected to larger wave load, so that the surge motion amplitude of the buoy is increased. The Spar type floating foundation body is a steel cylinder with the bottom loaded with pressure, and is connected with the seabed pile foundation through a radial mooring system. Because the structure bottom has the ballast, its focus is located the floating core, and the stability is better. However, the small waterline area of the Spar-type floating foundation makes the pitching and rolling motion amplitude larger, and may cause certain influence on the power generation performance of the upper wind turbine. The TLP type floating foundation body is composed of tower columns and floating drums, and is connected with a seabed pile foundation through tension tendons at the bottom of the TLP type floating foundation body. The tension tendon is tightened to increase the draught, and the buoyancy is larger than the gravity of the structure. The residual buoyancy is offset by the tension on the tension tendon, so that the structure is stable, and the structure motion amplitude is small. Compared with other floating foundations, limited platform movement is expected to reduce structural loads on towers and blades, and the TLP type floating wind turbine has a good application prospect particularly for sites where a catenary mooring system is not applicable. However, the existing TLP type wind turbine foundation generally adopts a pile foundation and a suction foundation, and once the foundation is in place, the foundation is not easy to migrate again, so that the construction difficulty is high, and the migration cost is quite high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a migratable marine wind power floating basis.

The utility model discloses a realize through following technical scheme:

a migratory offshore wind power floating foundation comprises a floating platform and a mooring system;

the floating platform comprises a stand column and a plurality of floating boxes; the buoyancy tanks are radially and symmetrically arranged around the lower part of the upright post; a first compartment plate is arranged in the buoyancy tank, the first compartment plate divides the interior of the buoyancy tank into a plurality of compartments, and each compartment is provided with a valve capable of carrying out water-gas replacement;

the mooring system comprises an anchoring foundation and a plurality of groups of mooring lines;

four vertically-arranged partition plates are arranged in the anchoring base, a central stacking groove is defined by the interior of each partition plate, a cabin is formed between each partition plate and the outer wall of the anchoring base, a second cabin plate is arranged in each cabin, the second cabin plate divides each cabin into a plurality of sub-cabins, and each sub-cabin is provided with a valve capable of carrying out water-gas replacement; an inner apron board and an outer apron board are arranged at the bottom of the anchoring base.

Each group of mooring lines corresponds to one buoyancy tank, the upper end of each buoyancy tank is connected with the bottom of the corresponding buoyancy tank, and the lower end of each buoyancy tank is connected with the upper surface of the anchoring foundation;

in the technical scheme, the upper end of the upright post is connected with the fan tower barrel through a flange.

In the technical scheme, the upright post is of a cylindrical structure with a cavity, the diameter is 6-10m, the height is 15-25m, and the wall thickness is 50-100 mm.

In the above technical scheme, the buoyancy tanks are 4 in number and are arranged in a cross shape, and the upright columns are located at the center of the cross shape.

In the technical scheme, the length of the buoyancy tank is 8-12m, the width of the buoyancy tank is 3-7m, the height of the buoyancy tank is 5-9m, and the wall thickness of the buoyancy tank is 10-20 mm.

In the above technical scheme, the first compartment plate is arranged along the vertical direction to divide the buoyancy tank into an inner compartment and an outer compartment.

In the technical scheme, the cross section of the foundation of the sinking pad is square, and the side length is 20-30 m.

In the technical scheme, the cross section of the central stacking groove is square, the side length is 8-12m, and the height is 4-6 m.

In the technical scheme, the height of the inner apron board and the outer apron board is 4-6 m.

A method for operating a transportable offshore wind power floating foundation comprises the following steps:

(1) firstly, prefabricating the floating platform and the mooring system on land respectively, stably installing a fan tower cylinder on the floating platform, towing and transporting the floating platform provided with the fan tower cylinder to an operation sea area, towing and transporting the mooring system to the operation sea area, and arranging a buoy ball at the upper end of a mooring line to enable the upper end of the mooring line to float on the water surface;

(2) injecting water into the sub-chambers of the anchoring foundation through a water-gas replacement valve to enable the anchoring foundation to lose buoyancy and sink, and embedding the anchoring foundation into the seabed for fixation in a central stacking and internal-external pressure difference mode;

(3) anchoring the upper end of the mooring line to the buoyancy tank according to the indicated position of a buoy ball, and pre-tensioning the mooring line by 10% -50% to balance the buoyancy of the floating platform and enable the mooring line to be in a tensioned state;

(4) injecting water into the sub-cabin inside the buoyancy tank through a water-gas replacement valve to enable the floating platform provided with the fan tower barrel to lose part of buoyancy and sink, and when the floating platform sinks to a designed draft position, pre-tensioning the rest 50% -90% of mooring lines to balance the buoyancy of the floating platform;

(5) adjusting the gravity center and the floating center position of the offshore wind power floating foundation by injecting water or pumping water into the sub-chambers of the buoyancy tanks;

(6) when the offshore wind power floating foundation is transferred, water is injected into a compartment inside the buoyancy tank through a water-gas replacement valve, so that the floating platform provided with the fan tower cylinder loses part of buoyancy and sinks, the tension of the mooring line is cancelled, and the buoyancy tank is separated from the mooring line;

(7) removing the center pile load of the anchoring foundation, and gradually discharging the water body in the sub-cabins of the anchoring foundation through a water-gas replacement valve to enable the anchoring foundation to float up to the sea surface through buoyancy;

(8) and towing and transporting the floating platform provided with the fan tower drum and the mooring system to a target sea area, and then installing and operating again.

The utility model discloses an advantage and beneficial effect do:

1. the utility model discloses an offshore wind power floating foundation, its floating platform combine the design with the stand of little water line face and the flotation tank of big water line face, ensure that the basis provides enough floating stability by big water line face flotation tank when towing a boat, the fan is submerged under water at the on-the-spot state flotation tank simultaneously, and the stand of little water line face receives the wave load influence little, guarantees the stability of basis.

2. The utility model discloses an offshore wind power floating basis, its mooring system's anchor basis utilize the frictional resistance who presses load and skirtboard to provide resistance to plucking, for mooring line location, the anchor basis can irritate sand ballast, the structure of skirtboard is taken to the lower part for the center, and great water line face makes it can tow a voyage to the operation waters to the accessible is piled and is carried and inside and outside differential pressure penetrates into the seabed, construction convenience.

3. The utility model discloses a marine wind power floating basis, its mooring system's anchor basis is hollow structure, accessible self buoyancy come-up to the sea, the marine wind power floating basis of being convenient for migrates, can make fan reuse many places, a plurality of minutes cabins are divided into through the subdivision board with anchor basis inside simultaneously to the flotation tank, at installation, operation and demolish the in-process, the focus and the center of buoyancy position on marine wind power floating basis are adjusted to the accessible subdivision room, the control structure gesture, be convenient for construction and operation.

Drawings

Fig. 1 is a schematic perspective view of a transportable offshore wind power floating foundation according to the present invention;

fig. 2 is a front view of a transportable offshore wind power floating foundation according to the present invention;

fig. 3 is a top view of a migratable offshore wind power floating foundation of the present invention.

Fig. 4 is a perspective schematic view of the floating platform of the present invention.

Fig. 5 is a schematic view of the bottom structure of the middle anchoring foundation of the present invention.

Fig. 6 is a schematic view of an internal perspective structure of the middle anchoring base of the present invention.

Wherein: the floating box comprises a vertical column 1, a floating box 2, a mooring line 3, an anchoring foundation 4, a first bulkhead 5, a second bulkhead 6, an inner apron plate 7, an outer apron plate 8, a partition plate 9 and a central stacking groove 10.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the specific embodiments.

Examples

As shown in fig. 1 to 5, the present embodiment discloses a transportable offshore wind power floating foundation, which is composed of a floating platform and a mooring system.

The floating platform comprises a stand column 1 and a buoyancy tank 2, the upper end of the stand column 1 is connected with a fan tower cylinder through a flange, and the lower part of the stand column 1 is fixedly connected with the buoyancy tank 2. Considering that the weight of the engine room and the blades of the offshore wind turbine is larger and 80-100 m above the water surface, in order to enable the wind turbine to normally generate electricity, the stability of the foundation under the combined action of wind and waves and the capability of resisting the wind and wave load must be ensured. The upright column 1 and the buoyancy tank 2 are made of steel structures, concrete structures or other materials with lighter weight, and can bear larger wind power load. The design of combining the small waterplane area upright post 1 with the large waterplane area buoyancy tank 2 provides enough floating stability by the large waterplane area buoyancy tank 2 to realize the integral floating towing of the floating platform, the tower barrel and the fan, and the installation and the transportation are convenient; and in the on-site state, the buoyancy tank 2 submerges below the water surface, and the upright post 1 of the small water line surface is positioned on the water surface so as to reduce the influence of wave load.

The column 1 is a cylindrical structure with a cavity, the diameter of the column is 8m, the height of the column is 20m, and the wall thickness of the column is 50 mm.

The buoyancy tank 2 is of a cubic structure with four cavities and is radially and symmetrically distributed, the length of the cubic structure is 10m, the width of the cubic structure is 5m, the height of the cubic structure is 7m, and the wall thickness of the cubic structure is 15 mm. Inside all being provided with one first subdivision board 5 of 2 every boxes of flotation tank, first subdivision board 5 divides 2 every box of flotation tank inside into inside and outside two and divides the cabin, and every divides the cabin all to be equipped with the valve that can carry out the aqueous vapor replacement, and the focus position is adjusted to the ballast of adding water in 2 accessible of flotation tank each subdivision rooms, guarantees basic towing stability. The bottom of the buoyancy tank 2 is provided with a mooring line connecting structure at a position close to the outer edge so as to anchor the mooring line 3.

The mooring system comprises an anchoring base 4 and mooring lines 3.

Four partition plates 9 which are vertically arranged are arranged in the anchoring base, a central stacking groove 10 is defined by the interior of each partition plate, a cabin is formed between each partition plate and the outer wall of the anchoring base, a second cabin plate 6 is arranged in each cabin, each cabin is divided into a plurality of sub-cabins by the second cabin plates, and each sub-cabin is provided with a valve capable of carrying out water-gas replacement; the center of gravity position of the anchoring foundation 4 can be adjusted by adding water into each compartment and ballasting, and the towing stability of the foundation is ensured. The side length of the anchoring base is 25m, the side length of the central stacking groove is 10m, and the height of the central stacking groove is 5 m; the inner and outer edges of the lower part of the anchoring foundation are provided with an inner skirt plate 7 and an outer skirt plate 8 which are 5m in height;

the upper surface of the anchoring foundation is provided with an anchoring point which is used for being connected with the lower end of the mooring line 3, the sub-chambers can be ballasted by adding water, the inner part of the central loading groove can be ballasted by filling sand, and the inner skirt plate 7 and the outer skirt plate 8 penetrate into the seabed through pressure loading and internal and external pressure difference. After the anchoring foundation 4 is penetrated into the seabed through heaping load and internal and external pressure difference, the anti-pulling force is provided for positioning the mooring line 3 by utilizing the pressure load and the frictional resistance provided by the inner skirt plate 7 and the outer skirt plate 8.

The mooring lines 3 are divided into four groups, corresponding to the four buoyancy tanks 2. Four groups of mooring lines are respectively connected between the buoyancy tank 3 and the anchoring base 4. The diameter of the mooring line 3 is 167mm, steel stranded wires, polyester fiber wires and the like can be adopted, and the outside of the mooring line is wrapped by a rubber sleeve, so that the mooring line is prevented from being corroded and damaged in seawater; the upper ends of the two floating balls are provided with floating balls before anchoring, so that the anchoring operation is facilitated; and each anchoring point after anchoring is provided with a maintenance device.

The construction method of the transportable offshore wind power floating foundation is carried out according to the following steps:

(1) firstly, prefabricating a floating platform and a mooring system on land respectively, stably installing an upper fan tower cylinder on the floating platform, towing and transporting the upper fan tower cylinder and the floating platform to an operation sea area, and providing floating stability by using a buoyancy tank 2 with a large water surface to realize the whole floating towing of the floating platform, the tower cylinder and the fan; simultaneously, towing and transporting the mooring system to an operation sea area, wherein buoy balls are arranged at the upper ends of the mooring lines 3;

(2) after the floating platform provided with the upper fan tower drum and the mooring system are respectively towed and transported to an operation sea area, water is injected into a sub-cabin chamber inside the anchoring foundation through a water-gas replacement valve, so that the anchoring foundation 4 loses buoyancy and sinks, and the anchoring foundation 4 is embedded into the seabed for fixation through central stacking and internal-external pressure difference;

(3) connecting four groups of mooring lines 3 with four buoyancy tanks 2 according to the indicated positions of the buoy balls, and pre-tensioning the mooring lines 3 by 10-50% to balance the buoyancy of the floating platform and enable the mooring lines 3 to be in a tensioning state;

(4) injecting water into the inner layer sub-chamber of the buoyancy tank 2 through a water-gas replacement valve to enable the floating platform provided with the upper fan tower barrel to lose part of buoyancy and sink, and providing certain buoyancy for the foundation by air in the outer layer sub-chamber of the buoyancy tank 2 in the sinking process to ensure the stability of the offshore wind power floating foundation; when the floating platform sinks to the designed draft position, the mooring line 3 reaches the preset length, and the remaining 50-90% of the mooring line 3 is pretensioned to balance the buoyancy of the floating platform;

(5) discharging water in the layered cabins in the buoyancy tank 2 through a water-gas replacement valve, and ensuring that the offshore wind power floating foundation has certain floating stability;

(6) after the floating box is in place, the gravity center position of the offshore wind power floating foundation is adjusted by injecting water into the outer layer cabin of the floating box 2, so that the offshore wind power floating foundation is ensured to run safely and stably;

(7) when the offshore wind power floating foundation needs to be transferred, water is injected into the sub-cabin on the inner layer of the buoyancy tank 2 through the water-gas replacement valve, so that the floating platform provided with the fan tower cylinder loses part of buoyancy and sinks, the tension of the mooring line 3 is cancelled, and the buoyancy tank 2 is separated from the mooring line 3;

(8) removing the center pile load of the anchoring foundation 4, and gradually discharging water in the sub-cabins in the anchoring foundation through a valve for water-gas replacement to enable the anchoring foundation 4 to float up to the sea surface through buoyancy;

(9) and towing and transporting the floating platform provided with the fan tower drum and the mooring system to a target sea area, and installing and operating again.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.

Claims

1. A migratory offshore wind power floating foundation is characterized in that: comprises a floating platform and a mooring system;

four vertically-arranged partition plates are arranged in the anchoring base, a central stacking groove is defined by the interior of each partition plate, a cabin is formed between each partition plate and the outer wall of the anchoring base, a second cabin plate is arranged in each cabin, the second cabin plate divides each cabin into a plurality of sub-cabins, and each sub-cabin is provided with a valve capable of carrying out water-gas replacement; an inner apron plate and an outer apron plate are arranged at the bottom of the anchoring foundation;

each group of mooring lines corresponds to a buoyancy tank, the upper end of each buoyancy tank is connected with the bottom of the buoyancy tank, and the lower end of each mooring line is connected with the upper surface of the anchoring foundation.

2. The transportable offshore wind power floating foundation of claim 1, wherein: the upper end of the upright post is connected with the fan tower cylinder through a flange.

3. The transportable offshore wind power floating foundation of claim 1, wherein: the upright post is of a cylindrical structure with a cavity, the diameter is 6-10m, the height is 15-25m, and the wall thickness is 50-100 mm.

4. The transportable offshore wind power floating foundation of claim 1, wherein: the flotation tanks are 4 in number and are arranged in a cross shape, and the upright posts are positioned at the centers of the cross shapes.

5. The transportable offshore wind power floating foundation of claim 1, wherein: the length of the buoyancy tank is 8-12m, the width is 3-7m, the height is 5-9m, and the wall thickness is 10-20 mm.

6. The transportable offshore wind power floating foundation of claim 1, wherein: the first compartment plate is arranged along the vertical direction and divides the buoyancy tank into an inner compartment and an outer compartment.

7. The transportable offshore wind power floating foundation of claim 1, wherein: the cross section of the central stacking groove is square, the side length is 8-12m, and the height is 4-6 m.

8. The transportable offshore wind power floating foundation of claim 1, wherein: the height of the inner apron board and the outer apron board is 4-6 m.