Foundation buoy and foundation structure of floating type wind turbine generator

Abstract

The utility model discloses a floating type wind turbine generator foundation buoy and a foundation structure, and the foundation buoy comprises a distributed steel pipe frame which comprises a central steel pipe and peripheral steel pipes arranged around the central steel pipe; the end deck comprises an upper end deck and a lower end deck which are connected with the two ends of the distributed steel pipe frame respectively; the buoyancy module is made of glass fiber reinforced plastics and is formed by connecting a plurality of buoyancy units with a central steel pipe and a peripheral steel pipe in a layered manner, and each buoyancy unit is of a hollow watertight box body structure and is filled with a water pressure load or a solid pressure load; each buoyancy unit comprises a connecting pin connected with the central steel pipe, a through hole allowing the peripheral steel pipe to penetrate through and a skirt plate used for being connected with the adjacent buoyancy unit or the end deck, the connecting pins are arranged on the inner sides of the buoyancy units, the skirt plates are arranged on the outer sides of the buoyancy units, and connecting holes are formed in the skirt plates. According to the utility model, the manufacturing and maintenance cost is effectively reduced, the modular construction can be realized, and the construction period is greatly shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to offshore wind power generation technology, concretely relates to a floating wind turbine generator foundation buoy and foundation structure. BACKGROUND

[0002] Offshore wind power generation is an important part of clean energy. Studies have shown that for wind turbine generators installed in waters with a depth of more than 60 meters, compared with fixed foundations, using floating foundation structures to support wind turbine generators is more economical.

[0003] Floating wind turbine generator foundation structures are usually composed of multiple vertical or horizontal buoys. As a key component of floating foundation structures, buoys have an important impact on the economy, safety, and reliability of the foundation structures. Traditional buoys are made of pure steel, concrete, or steel-concrete composite materials. Due to the high density of steel and concrete materials, sufficient buoyancy needs to be provided to the structure by increasing the volume of the buoy, resulting in an increase in material usage and construction costs. In addition, the construction of pure steel buoy structures involves a large amount of welding work, while the production of concrete buoy structures requires processes such as formwork, reinforcement binding, pouring, and maintenance, resulting in a long construction period, which is not conducive to large-scale construction. SUMMARY

[0004] The technical problem to be solved by the utility model is the high construction cost and long construction period of traditional floating wind turbine generator foundation structure buoys. The utility model provides a floating wind turbine generator foundation buoy and foundation structure that can shorten the construction period.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A floating wind turbine generator foundation buoy, comprising:

[0007] A distributed steel pipe frame, which is the main force component of the buoy, includes a central steel pipe located at the center and a peripheral steel pipe arranged around the central steel pipe;

[0008] An end deck, which is the end force transmission component of the buoy, includes an upper end deck and a lower end deck connected to the two ends of the distributed steel pipe frame, respectively;

[0009] The buoyancy block is composed of a plurality of buoyancy units connected with the center steel pipe and the peripheral steel pipe of the distributed steel pipe frame in layers, each buoyancy unit is a hollow watertight box structure filled with water ballast or solid ballast, and each buoyancy unit comprises a connecting pin connected with the center steel pipe, a perforation for the peripheral steel pipe to pass through, and a skirt plate for connecting with an adjacent buoyancy unit or an end deck, the connecting pin is arranged inside the buoyancy unit, the skirt plate is arranged outside the buoyancy unit, and the skirt plate is provided with a connecting hole.

[0010] Preferably, the center steel pipe is provided with a T-shaped groove, and the connecting pin is an L-shaped connecting pin, the L-shaped connecting pin of the buoyancy unit is inserted into the T-shaped groove of the center steel pipe to form a reliable connection with the center steel pipe.

[0011] Preferably, the center steel pipe is filled with concrete to improve the overall strength of the center steel pipe.

[0012] Preferably, the peripheral steel pipe is a hollow steel pipe for improving the bending stiffness of the steel pipe frame, and the internal space of the peripheral steel pipe is used for ballast and ventilation pipeline arrangement.

[0013] Preferably, the T-shaped groove is filled with structural glue between the connecting pin, the peripheral steel pipe and the perforation of the buoyancy unit.

[0014] Preferably, the buoyancy units are connected into an integral whole by bolts to form the buoyancy block.

[0015] Preferably, the end deck is a steel hollow watertight box structure, the end of the distributed steel pipe frame penetrates into the inside of the end deck and is welded to a force-bearing member, and the end deck is connected to the buoyancy block by bolts.

[0016] Preferably, the bolt and the nut matched with the bolt are both made of carbon fiber reinforced plastic.

[0017] Preferably, the buoyancy unit is made of glass fiber reinforced plastic.

[0018] Based on the same inventive concept, the utility model also provides a floating type wind turbine generator foundation structure, which comprises outer columns, lower connecting beams, lower diagonal braces, upper connecting beams and middle columns, the middle columns are used for supporting a wind turbine generator and a tower thereof, the outer columns are arranged around the middle columns, the middle columns and the outer columns are connected through the upper connecting beams and the lower connecting beams, the lower diagonal braces are arranged between adjacent outer columns, and the outer columns and the lower connecting beams adopt the floating cylinder.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] 1. The buoy structure of the present application makes full use of the advantages of GFRP-steel composite materials, effectively reducing the manufacturing cost. The buoyancy block is made of lightweight and high-strength GFRP material, which can significantly reduce the amount of steel used. Its resistance to seawater corrosion also reduces the use of corrosion-resistant coatings, greatly reducing manufacturing and maintenance costs. The distributed steel pipe frame is embedded in the buoyancy block, which makes up for the lack of toughness of GFRP material and improves the carrying capacity of the buoy structure.

[0021] 2. The buoy structure of the present application adopts assembly design, which can realize modular construction and greatly shorten the construction period. The size of the buoyancy unit is uniform, and the distributed steel pipe frame structure is simple, which is conducive to standardized and batch manufacturing in the factory. After transportation to the floating body construction site, it can be quickly assembled through L-shaped connecting pins, T-shaped grooves and bolts, significantly improving the construction and installation efficiency.

[0022] 3. The distributed steel pipe frame, buoyancy block and end deck of the present application form an efficient stress system. The distributed steel pipe frame provides bending and shear strength for the buoy structure; the buoyancy block provides the necessary buoyancy for the buoy while providing strong lateral restraint for the steel pipes of the distributed steel pipe frame to prevent buckling failure of the steel pipes; the end deck enhances the end restraint of the distributed steel pipe frame and the buoyancy block, and also provides an interface for the connection of other components. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0024] Figure 1 It is an elevation view of the floating type wind turbine foundation buoy structure of one of the embodiments of the present application;

[0025] Figure 2 It is a combination structure diagram of the steel pipe frame and the end deck of one of the embodiments of the present application;

[0026] Figure 3 It is a schematic diagram of the steel pipe frame structure of one of the embodiments of the present application;

[0027] Figure 4 It is a schematic diagram of the end deck structure of one of the embodiments of the present application;

[0028] Figure 5 It is a schematic diagram of the buoyancy unit structure of one of the embodiments of the present application;

[0029] Figure 6 The installation schematic view of the buoyancy unit of one of the embodiments of the present application in the steel pipe frame;

[0030] Figure 7 The schematic view of the five-column semi-submersible foundation of the floating wind turbine unit of one of the embodiments of the present application;

[0031] Figure 8 The schematic view of the four-column semi-submersible foundation of the floating wind turbine unit of one of the embodiments of the present application.

[0032] In the figure: buoyancy module 1; buoyancy unit 11; connecting pin 111; vertical skirt plate 112; horizontal skirt plate 113; perforation 114; bolt hole 115; distributed steel pipe frame 2; central steel pipe 21; central steel pipe wall 211; T-shaped groove 212; concrete 213; peripheral steel pipe 22; end deck 3; end deck skirt plate 31; bolt hole 32; outer column 4; lower tie beam 5; lower diagonal brace 6; upper tie beam 7; middle column 8; wind turbine tower 9; wind turbine unit 10; mooring chain 11. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with specific preferred embodiments, but the protection scope of the present application is not limited by this.

[0034] In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0036] Referring to Figure 1 and Figure 2 , Figure 1 is a front view of a buoy structure suitable for a floating wind turbine foundation, Figure 2The figure is a combination structure of distributed steel pipe frame and end deck. The pontoon comprises a buoyancy module 1, a distributed steel pipe frame 2 and an end deck 3. The buoyancy module 1 is composed of a plurality of buoyancy units 11 arranged in layers and connected with each other, and is arranged between two end decks 3. The distributed steel pipe frame 2 is composed of a central steel pipe 21 and a peripheral steel pipe 22, is embedded in the buoyancy module 1, and penetrates into the interior of the end deck 3 at both ends and is welded to the load-bearing member of the end deck 3.

[0037] Figure 3 The figure is a schematic diagram of the distributed steel pipe frame structure. The central steel pipe 21 and the peripheral steel pipe 22 are arranged in parallel, wherein the central steel pipe 21 is located at the central position of the distributed steel pipe frame, the surface of the steel pipe is provided with a T-shaped groove 212 for connection with the buoyancy unit 11, the inside of the central steel pipe 21 is filled with concrete 213 to form a steel pipe concrete structure to improve the bearing capacity of the steel pipe frame, and the peripheral steel pipe 22 is arranged around the central steel pipe 21 to improve the bending and torsional stiffness of the distributed steel pipe frame, and the internal space can be used for arrangement of ballast pipelines and ventilation pipelines.

[0038] Figure 4 The figure is a schematic diagram of the end deck structure. The end deck 3 is a steel hollow water-tight box structure, the bottom end of which is provided with a skirt plate 31 around the box, and the skirt plate 31 is provided with bolt holes 32 for connection with the buoyancy unit 11 of the buoyancy module 1 through bolts.

[0039] Figure 5Figure 2 is a schematic diagram of a buoyancy unit structure. The buoyancy unit 11 is a hollow watertight box structure, the outer shell of which is made of glass fiber reinforced plastic (also known as glass steel, internationally recognized abbreviation GFRP or FRP) which is light in weight and strong in strength. Two L-shaped connecting pins 111 are arranged at the corners inside the buoyancy unit 11, and the size of the L-shaped connecting pins 111 matches the T-shaped groove 212 on the surface of the center steel pipe 21. By embedding the L-shaped connecting pins 111 into the T-shaped groove 212 of the center steel pipe 21, reliable connection with the distributed steel pipe frame 2 can be achieved. The box is provided with a through hole 114 along the axial direction, and the hole diameter is consistent with the pipe diameter of the peripheral steel pipe 22, so that the peripheral steel pipe 22 can pass through the bottom of the buoyancy unit 11 and bear stress together with the buoyancy unit 11. Two vertical skirt plates 112 and two horizontal skirt plates 113 are arranged on the outer side of the buoyancy unit 11, and bolt holes are reserved on the horizontal skirt plates 113 for the connection of adjacent buoyancy units 11 above and below, and bolt holes are reserved on the vertical skirt plates 112 for the connection of adjacent buoyancy units 11 left and right. The inside of the buoyancy unit 11 can be used as a ballast tank, and by filling a certain weight of seawater or fixed ballast, the structural weight of the buoyancy unit 11 can be adjusted to achieve the purpose of adjusting the draft of the floating wind turbine foundation. The size of each buoyancy unit 11 is uniform, and multiple buoyancy units 11 are connected by bolts to form a buoyancy unit group 1. The buoyancy unit 11 serves as an independent cabin in the buoy, and when the buoy is partially damaged due to external impact load, the multi-cabin design can effectively prevent the buoy from sinking due to the inflow of a large amount of seawater.

[0040] Figure 6 Figure 3 is a schematic diagram of the installation of the buoyancy unit on the distributed steel pipe frame. After the welding of the distributed steel pipe frame 2 and the lower deck 3 is completed, the center steel pipe T-shaped groove 212 and the peripheral steel pipe 22 are used as tracks to slide the buoyancy unit 11 from the upper end to the bottom of the steel pipe frame 2. In order to reduce the friction between the components during sliding, lubricant is applied to the surface of the T-shaped groove 212 and the peripheral steel pipe 22. After sliding in place, the bolts on the skirt plates 112, 113 of the buoyancy unit are installed to reliably connect adjacent buoyancy units 11 and the lower deck 3. The bolts and nuts used for connection are made of corrosion-resistant carbon fiber reinforced plastic. Repeat the above installation steps until the assembly of multiple buoyancy units 11 is completed to form a buoyancy unit group 1. Due to manufacturing errors, there may be gaps between the T-shaped groove 212 and the L-shaped connecting pin 111, and between the peripheral steel pipe 22 and the buoyancy unit opening 114. Structure glue is used to fill the gaps to prevent the buoyancy unit 11 from loosening. Finally, the other end of the steel pipe frame 2 is welded with the upper deck 3, and connected with the buoyancy unit group 1 through the bolts on the skirt plate 31. The distributed steel pipe frame 2 and the deck 3 are coated with protective paint, and the sacrificial anode method is used to prevent seawater corrosion of the metal components.

[0041] Preferably, for pontoons with small cross-sectional dimensions, the buoyancy block 1 of a certain layer can be composed of a single buoyancy unit 11. In this case, the vertical skirt plate 112 of the buoyancy unit 11 is removed, and only the horizontal skirt plate 113 is retained for connection with the buoyancy units 1 of the upper and lower layers.

[0042] Figure 7 This diagram illustrates a five-column semi-submersible foundation for a floating wind turbine using the aforementioned pontoon structure. The foundation is a semi-submersible floating structure, composed of outer columns 4, lower connecting beams 5, lower diagonal braces 6, upper connecting beams 7, and a central column 8, all connected together. The semi-submersible foundation is anchored to the seabed via catenary mooring chains 11. The four outer columns 4 are arranged around the central column 8, employing the pontoon structure provided by this invention. Six layers of buoyancy blocks 1 are arranged between the two steel end decks 3, each layer consisting of four buoyancy units 11. The outer columns 4 are connected to the central column 8 via the lower connecting beams 5 and the upper connecting beams 7. The lower connecting beam 5 also employs the pontoon structure provided by this invention, with five layers of buoyancy blocks arranged between the two steel end decks 3. Due to the small cross-sectional size of the lower connecting beam 5 in this example, each layer of buoyancy blocks consists of a single buoyancy unit. The two steel end decks are welded to the sides of the lower decks of the outer columns 4 and the lower sides of the central column 8, respectively. The central column 8 is a hollow, watertight steel structure that supports the wind turbine 10 and its tower 9 at its top. The two ends of the upper connecting beam 7 are welded to the side of the upper deck of the outer column 4 and the upper side of the central column 8, respectively. Four lower diagonal braces 8 are used to connect the four outer columns 4 to increase the overall strength of the structure. Applying the float structure provided by this invention to the outer columns 4 and lower connecting beams 5 of a floating wind turbine foundation can significantly reduce the weight of the float and the amount of steel used. Furthermore, the convenient installation of the float structure can effectively shorten the foundation construction period, thereby reducing construction costs.

[0043] Preferably, the pontoon structure provided by this utility model can also be applied to the four-column semi-submersible foundation of floating wind turbine units, such as... Figure 8 As shown. Similar to a four-column semi-submersible foundation, the floating structure consists of outer columns 4, lower connecting beams 5, lower diagonal braces 6, upper connecting beams 7, and a central column 8. The semi-submersible foundation is anchored to the seabed via catenary mooring chains 11. The floating structure of this invention is applied to the three outer columns 4 and the three lower connecting beams 5. The central column 8 is a hexagonal prism design, used to support the wind turbine 10 and its tower 9.

[0044] The above merely describes specific implementation of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art, without departing from the scope of the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application by using the disclosed technical content, or modify equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application shall fall within the scope of protection of the technical scheme of the present application.

Claims

1. A floating wind turbine foundation pontoon, characterized in that The application relates to a floating pontoon, comprising: a distributed steel pipe frame serving as a main force bearing component of the pontoon, which comprises a central steel pipe located in the center and peripheral steel pipes arranged around the central steel pipe; end decks serving as end force bearing components of the pontoon, which comprise upper end decks and lower end decks respectively connected with two ends of the distributed steel pipe frame; a floating block composed of a plurality of floating units connected with the central steel pipe and the peripheral steel pipes of the distributed steel pipe frame in layers, wherein each floating unit is a hollow watertight box structure filled with water ballast or solid ballast, and each floating unit comprises a connecting pin connected with the central steel pipe, a perforation through which the peripheral steel pipe passes, and a skirt plate used for connecting with adjacent floating units or end decks, wherein the connecting pin is arranged on the inner side of the floating unit, the skirt plate is arranged on the outer side of the floating unit, and the skirt plate is provided with a connecting hole.

2. The floating wind turbine foundation buoy according to claim 1, wherein, The central steel pipe is provided with a T-shaped groove, the connecting pin is an L-shaped connecting pin, and the L-shaped connecting pin of the floating unit is inserted into the T-shaped groove of the central steel pipe to form a connection with the central steel pipe.

3. The floating wind turbine foundation buoy according to claim 2, wherein, The central steel pipe is internally filled with concrete.

4. The floating wind turbine foundation buoy according to claim 1, wherein, The peripheral steel pipe is a hollow steel pipe, and the internal space of the peripheral steel pipe is used for arranging ballast and ventilation pipelines.

5. The floating wind turbine foundation buoy according to claim 2, wherein, The T-shaped groove, the connecting pin and the perforation of the floating unit are filled with structural glue.

6. The floating wind turbine foundation buoy according to claim 1, wherein, The floating units are connected into an integrated whole by bolts to form the floating block.

7. The floating wind turbine foundation buoy according to claim 1, wherein, The end decks are steel hollow watertight box structures, the ends of the distributed steel pipe frame penetrate into the interior of the end decks and are connected with force bearing components by welding, and the end decks are connected with the floating block by bolts.

8. The floating wind turbine foundation buoy according to claim 7, wherein, The bolts and the nuts matched with the bolts are made of carbon fiber reinforced plastic.

9. The floating wind turbine foundation buoy according to claim 7, wherein, The floating units are made of glass fiber reinforced plastic.

10. A floating wind turbine foundation structure comprising outer columns, lower tie beams, lower braces, upper tie beams and a central column for supporting a wind turbine and its tower, the outer columns being arranged around the central column, the central column being connected to the outer columns by upper and lower tie beams, the lower braces being provided between adjacent outer columns, characterised in that, The outer columns and the lower connecting beams are the pontoon according to any one of claims 1-9.

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