A single pile foundation protection device for offshore wind turbines based on natural design

Abstract

This case provides an offshore wind turbine monopile foundation protection device based on natural design. When the offshore wind turbine monopile foundation is a steel pipe pile, the protective layer surrounds the steel pipe pile, and a number of shell fill nets, gravel piles and concrete pipes are laid on the protective layer at intervals. When the offshore wind turbine monopile foundation is a submarine cable, the submarine cable is covered with a pebble layer, an ecological mat and a shell fill net in sequence. The surrounding scour-affected area of ​​the offshore wind turbine monopile foundation is covered with an ecological mat for pressure capping protection. At the same time, a shell fill net covering the outside of the ecological mat is used to achieve a reliable scour protection effect, thereby effectively protecting the seabed around the offshore wind turbine monopile foundation from being easily damaged by seawater scour, and preventing the offshore wind turbine monopile foundation from fatigue damage caused by the scouring effect of water circulation. This case constructs a new offshore wind turbine monopile foundation protection device based on natural design, which can not only quickly form biological fixation and cultivate biological communities, but also help to protect the offshore wind turbine monopile foundation at a low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore wind turbine monopile foundations, and in particular relates to an offshore wind turbine monopile foundation protection device based on natural design. Background Art

[0002] At present, due to the actual conditions of my country's sea areas, offshore wind power monopile foundation accounts for about 80% of the share. Offshore wind power monopile foundation is the dominant foundation structure type of offshore wind power, mainly composed of steel pipe piles and submarine cables. The upper part of the steel pipe pile is connected to the wind turbine tower, the middle part is immersed in water, and the bottom is inserted into the seabed.

[0003] Since the bottom of the steel pipe pile or the submarine cable is buried at the bottom of the seabed for a long time and the seabed is easily affected by waves, the sand-carrying capacity of the water flow is increased, which in turn causes the bottom of the steel pipe pile or part of the seabed at the submarine cable to be eroded, thus affecting the stability of the structure.

[0004] Therefore, how to effectively protect the seabed around the offshore wind power monopile foundation from being easily eroded and damaged is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide an offshore wind turbine monopile foundation protection device based on natural design, which can effectively protect the seabed around the offshore wind turbine monopile foundation from being easily eroded and damaged.

[0006] In order to solve the above technical problems, the present invention provides an offshore wind turbine monopile foundation protection device based on natural design, comprising:

[0007] An ecological mat is used to compact the seabed around the offshore wind turbine monopile foundation by its own weight, the ecological mat comprising a plurality of ecological concrete blocks and a connecting rope group, wherein the plurality of ecological concrete blocks and the connecting rope group are integrally cast and formed;

[0008] The shell filling net is covered on the outside of the ecological mat and is used for forming biological fixation.

[0009] Optionally, in the above-mentioned offshore wind turbine monopile foundation protection device based on natural design, the offshore wind turbine monopile foundation is a steel pipe pile;

[0010] The offshore wind turbine single pile foundation protection device also includes a protective layer laid around the steel pipe pile, a plurality of shell filling nets are laid on the protective layer, and the ecological mat is arranged inside the shell filling net.

[0011] Optionally, in the above-mentioned offshore wind turbine monopile foundation protection device based on natural design, it also includes a plurality of gravel piles and a plurality of concrete pipes laid on the protective layer at intervals.

[0012] Optionally, in the above-mentioned offshore wind turbine monopile foundation protection device based on natural design, the protective layer at least includes: a filter layer and an armor layer arranged in sequence from bottom to top;

[0013] The filter layer is laid on the seabed to prevent soil loss caused by upward infiltration of the seabed soil, thereby ensuring the stability of the seabed foundation;

[0014] The armor layer is used to reinforce the offshore wind turbine monopile foundation.

[0015] Optionally, in the above-mentioned offshore wind turbine monopile foundation protection device based on natural design, the area of ​​the armor layer is smaller than the area of ​​the filter layer, and the shell filling net, the gravel pile and the concrete pipe are all arranged in the filter layer.

[0016] Optionally, in the above-mentioned offshore wind turbine monopile foundation protection device based on natural design, the concrete pipe is a low pH concrete pipe with a textured surface.

[0017] Optionally, in the above-mentioned offshore wind turbine monopile foundation protection device based on natural design, the offshore wind turbine monopile foundation is a submarine cable;

[0018] The offshore wind turbine monopile foundation protection device also includes a pebble layer, and the submarine cable sequentially covers the pebbles, the ecological mat and the shell filling net from the inside out.

[0019] Optionally, in the above-mentioned offshore wind turbine monopile foundation protection device based on nature design, the shell filling net is a net with shells arranged inside.

[0020] Optionally, in the above-mentioned offshore wind turbine monopile foundation protection device based on nature design, the connecting rope group is a polypropylene rope.

[0021] Optionally, in the above-mentioned offshore wind turbine single pile foundation protection device based on nature design, the plurality of the ecological concrete blocks are arranged in a matrix, and the connecting rope group includes: a series rope for connecting two adjacent ecological concrete blocks, and a rope buckle for hoisting the ecological concrete block arranged near the outermost edge.

[0022] The invention provides a natural design-based offshore wind turbine monopile foundation protection device, which has the following beneficial effects:

[0023] A protective device for offshore wind turbine monopile foundation based on natural design, comprising an ecological mat and a shell filling net. The ecological mat is used to compact the seabed around the offshore wind turbine monopile foundation with its own weight to prevent the offshore wind turbine monopile from shaking. The ecological mat comprises a plurality of ecological concrete blocks and a connecting rope group, which are integrally cast and formed with the connecting rope group, and have a certain connection stability. The shell filling net covers the outside of the ecological mat and is used to tightly wrap the materials inside it, including the ecological mat, to form biological fixation.

[0024] An ecological mat formed by connecting several ecological concrete blocks in series through a connecting rope group is used to cover and protect the surrounding scour-affected area of ​​the offshore wind turbine single pile foundation. At the same time, a shell filling net covering the outside of the ecological mat is used to achieve a reliable scour protection effect, thereby effectively protecting the seabed around the offshore wind turbine single pile foundation from being easily damaged by seawater scouring, and preventing the offshore wind turbine single pile foundation from fatigue damage caused by the scouring effect of water circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 A side view of an offshore wind turbine single pile foundation protection device based on a natural design arranged at a steel pipe pile provided by the present invention;

[0027] Figure 2 A top view of an offshore wind turbine single pile foundation protection device arranged based on natural design at a steel pipe pile provided by the present invention;

[0028] Figure 3 A schematic diagram of the structure of an eco-mat provided by a specific embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the structure of an eco-mat provided by another specific embodiment of the present invention;

[0030] Figure 5 A side view of an offshore wind turbine monopile foundation protection device based on natural design arranged at a submarine cable provided by the present invention.

[0031] In the above picture:

[0032] A-Steel pipe pile;

[0033] B-submarine cable;

[0034] C-seabed;

[0035] 1-armor layer; 2-filter layer; 3-shell filling net; 4-gravel pile; 5-slope; 6-concrete pipe; 7-ecological mat; 701-connecting rope group; 702-ecological concrete block; 8-pebble layer. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, the meaning of "plurality" is more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] The core of the present invention is to provide an offshore wind turbine monopile foundation protection device based on natural design, which can effectively protect the seabed around the offshore wind turbine monopile foundation from being easily eroded and damaged.

[0041] In order to enable those skilled in the art to better understand the technical solution provided by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] Please refer to Figure 1-Figure 5 , Figure 1 A side view of an offshore wind turbine single pile foundation protection device based on a natural design arranged at a steel pipe pile provided by the present invention; Figure 2 A top view of an offshore wind turbine single pile foundation protection device arranged based on natural design at a steel pipe pile provided by the present invention; Figure 3 A schematic diagram of the structure of an eco-mat provided by a specific embodiment of the present invention; Figure 4A schematic diagram of the structure of an eco-mat provided by another specific embodiment of the present invention; Figure 5 A side view of an offshore wind turbine monopile foundation protection device based on natural design arranged at a submarine cable provided by the present invention.

[0043] The present invention provides an offshore wind turbine monopile foundation protection device based on natural design, comprising an ecological mat 7 and a shell filling net 3.

[0044] The ecological mat 7 is used to compact the seabed C around the offshore wind turbine monopile foundation by its own weight to prevent the offshore wind turbine monopile from shaking. The ecological mat 7 includes a plurality of ecological concrete blocks 702 and a connecting rope group 701. The plurality of ecological concrete blocks 702 and the connecting rope group 701 are integrally cast and formed, and have a certain connection stability.

[0045] The shell filling net 3 covers the outer side of the ecological mat 7 and is used to tightly wrap the materials inside thereof including the ecological mat 7 to form biological fixation.

[0046] This case provides an offshore wind turbine single pile foundation protection device based on natural design. By using an ecological mat 7 formed by connecting a number of ecological concrete blocks 702 in series with a connecting rope group 701, the surrounding scouring area of ​​the offshore wind turbine single pile foundation is covered and protected. At the same time, a shell filling net 3 covering the outside of the ecological mat 7 is used to achieve a reliable scouring protection effect, thereby effectively protecting the seabed C around the offshore wind power single pile foundation from being easily damaged by seawater scouring, and preventing the offshore wind power single pile foundation from fatigue damage caused by the scouring effect of water circulation.

[0047] In a specific embodiment, when the offshore wind turbine monopile foundation is a steel pipe pile A, the offshore wind turbine monopile foundation protection device includes a protective layer laid around the steel pipe pile A, and the protective layer is arranged around the outer periphery of the offshore wind turbine monopile foundation.

[0048] A plurality of shell filling nets 3 are laid on the protective layer, and the ecological mat 7 is arranged inside the shell filling nets 3 .

[0049] Of course, the shape and material of the protective layer can be adaptively selected according to actual needs and are not further limited here.

[0050] The number of layers of the protective layer can be one layer or multiple layers stacked in sequence along the axial direction, and each layer can be made of the same material or different materials. The above improvements are all within the protection scope of this case and will not be described in detail here.

[0051] In a further specific embodiment, it also includes a plurality of gravel piles 4 and a plurality of concrete pipes 6 which are laid on the protective layer at intervals. The height, width and volume of the gravel piles 4 can be adjusted according to the flow velocity of the specific water area, which is not limited here.

[0052] Of course, the gravel can also be rocks, which are placed at the outer edge of the filter layer 2 to better protect the slope angle of the filter layer 2. The volume and quantity of the rocks can be determined according to the diameter of the wind turbine pile and the specific water conditions.

[0053] Specifically, the concrete pipe 6 can be a low pH concrete pipe 6, and the surface of the concrete pipe 6 can also be textured. When laying the low pH concrete pipe 6, the concrete can be made of a mixture that reduces the pH value of the concrete, and can be textured to promote the rapid reproduction of benthic animals. Its main purpose is to ensure the attachment and rooting of submarine plants, quickly form biological adhesion, and solidify and protect the seabed C.

[0054] Similarly, the eco-concrete blocks 702 in the eco-mat 7 can also be low pH concrete blocks with surface texture treatment, which have the same beneficial effects as mentioned above and will not be described in detail here.

[0055] The shell filling net 3 can be a net with shells or other materials arranged inside. Shells or other biological materials, on the one hand, the shell structure and other organisms do not damage the marine environment and will not pollute the seawater; on the other hand, the shell structure has a large surface area, which can provide a good attachment space for microalgae and macroalgae, and the unique spatial structure of the shell structure can provide abundant natural bait and more attachment space and shelter for marine organisms.

[0056] Furthermore, the protective layer at least includes: a filter layer 2 and an armor layer 1 arranged in sequence from bottom to top.

[0057] The filter layer 2 is laid on the seabed C to prevent soil loss caused by upward infiltration of the seabed C, thereby ensuring the stability of the foundation of the seabed C; the armor layer 1 is used to reinforce the single pile foundation of the offshore wind turbine to ensure the reliability and durability of the reinforcement.

[0058] In a specific embodiment, the area of ​​the armor layer 1 is smaller than the area of ​​the filter layer 2 , and the shell filling net 3 , the gravel pile 4 and the concrete pipe 6 are all arranged in the filter layer 2 .

[0059] Combination Figure 1 and Figure 2 As shown in the figure, the central column represented by A is the steel pipe pile A. Taking the diameter of the steel pipe pile A of 7m as an example, 1D represents one times the diameter of the steel pipe pile A.

[0060] The armor layer 1 is an annular structure surrounding the steel pipe pile A, and its diameter is 3D (three times the diameter of the steel pipe pile A). The filter layer 2 is also an annular structure surrounding the steel pipe pile A, and its diameter is 5D (five times the diameter of the steel pipe pile A). In the figure, the slope 5 of the upper and lower layers of the armor layer 1 and the filter layer 2 is 1:2, and is symmetrical. A gravel pile 4 and a shell filling net 3 (randomly arranged in equal amounts) are arranged on the filter layer 2 to protect the armor layer 1 and the filter layer 2.

[0061] Figure 2 The circle with a smaller inner area is the armor layer 1, and the radius of the circumscribed circle of the filter layer 2 is 5 times that of the steel pipe pile A, but the edge is irregularly wavy. A gravel pile 4, a shell filling net 3, and a flat concrete pipe 6 are placed on the filter layer 2. Taking the diameter of the steel pipe pile A of 7m as an example, 450 one-meter-high gravel piles 4, 450 shell filling nets 3, and 450 concrete pipes 6 are laid.

[0062] By arranging an ecological mat 7 and a shell filling net 3 with energy dissipation and anti-scouring functions on the seabed to increase the anti-scouring ability, reduce the flow velocity of the water flow, and then weaken or inhibit the scouring force of the water flow, it can not only reduce the flow velocity of the ocean current and create a good sediment environment, but also contribute to the protection of the marine ecological environment. In addition, this solution has a simple structure, can save engineering materials, and has low cost.

[0063] like Figure 1 As shown, for the offshore wind turbine single pile foundation protection device of steel pipe pile A, the following steps are performed:

[0064] 1. Arrange the filter layer 2 and the armor layer 1 around the steel pipe pile A, wherein the slope ratio of the armor layer 1 and the filter layer 2 is not higher than 1:2;

[0065] 2. Place a 1-meter-high gravel pile 4, which is located above the filter layer 2 and outside the armor layer 1;

[0066] 3. Place 1m large rocks on the outside of the filter layer 2 to better protect the slope angle of the filter layer 2;

[0067] 4. Laying low pH concrete pipes 6. The concrete can be made with a mixture that lowers the pH of the concrete and can be textured to promote rapid reproduction of benthic animals;

[0068] 5. Place the ecological mat 7 and the shell filling net 3 to increase the convenience of biological attachment. Various shells are placed in the net of the shell filling net 3. The ecological mat 7 based on ecological concrete is made of high-strength concrete blocks and polypropylene ropes, and the ecological mat 7 is placed in the shell filling net 3.

[0069] In a specific embodiment, the offshore wind turbine monopile foundation is a submarine cable B, and the offshore wind turbine monopile foundation protection device also includes a pebble layer 8. The submarine cable B is covered with the pebble layer 8, the ecological mat 7 and the shell filling net 3 from the inside to the outside.

[0070] like Figure 5 As shown, for the offshore wind turbine monopile foundation protection device of the submarine cable B pipeline, firstly, a pebble layer 8 is laid along both sides of the submarine cable B to form a slope 5 of no more than 20°, and then an ecological mat 7 is arranged on the submarine cable B and the pebble layer 8. A shell filling net 3 is placed above the ecological mat 7 to protect the ecological mat 7, and it is also conducive to the formation of rapid biological fixation.

[0071] In addition, the connecting rope group 701 in the ecological mat 7 is a polypropylene rope, which has the characteristics of corrosion resistance, wear resistance, toughness, and anti-aging. Of course, the connecting rope group 701 can also be a rope body made of other materials, which is not further limited here.

[0072] In a specific embodiment, a plurality of eco-concrete blocks 702 are arranged in a matrix, and the connecting rope set 701 includes: a series rope and a rope buckle.

[0073] The series rope is used to connect two adjacent eco-concrete blocks 702, and the rope buckle is used to facilitate the hoisting of the offshore wind turbine single pile foundation protection device. The rope buckle can be specifically set on the eco-concrete block 702 close to the outermost edge.

[0074] like Figure 4 As shown, in the matrix-type ecological concrete blocks 702, rope buckles for hoisting are arranged on the edges of the two sides, and serial ropes are arranged on the other two sides and between the adjacent ecological concrete blocks 702 to prevent damage to the connection between them. Of course, the rope buckles and serial ropes can both use the same material and structure. In addition, the location and number of the rope buckles and serial ropes can also be adaptively selected according to actual applications.

[0075] This patent adopts a protection concept based on natural design, adopts natural shell filling net 3, ecological mat 7 and special design concept to construct a new offshore wind turbine single pile foundation protection device based on natural design, which can quickly form biological fixation and cultivate biological communities, which is helpful for protecting the marine ecological environment, and is also beneficial for reducing the flow rate of ocean currents and creating a good sediment environment. It can save engineering materials and protect the offshore wind turbine single pile foundation at a low cost.

[0076] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0077] Furthermore, the terms “first”, “second”, and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0078] In this specification, various embodiments are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0079] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A single pile foundation protection device for offshore wind turbines based on natural design, characterized in that: The offshore wind turbine monopile foundation is a steel pipe pile, and the offshore wind turbine monopile foundation protection device comprises: An ecological mat is used to compact the seabed around the offshore wind turbine monopile foundation by its own weight, the ecological mat comprises a plurality of ecological concrete blocks and a connecting rope group, the plurality of ecological concrete blocks and the connecting rope group are integrally cast and formed, the plurality of ecological concrete blocks are arranged in a matrix, the connecting rope group comprises: a series rope for connecting two adjacent ecological concrete blocks, and a rope buckle for hoisting arranged on the ecological concrete block near the outermost edge; A shell filling net, covering the outside of the ecological mat, is used to form biological fixation; A protective layer is laid around the steel pipe piles, a plurality of shell filling nets are laid on the protective layer, the ecological mat is arranged inside the shell filling nets, the protective layer at least comprises: a filter layer and an armor layer arranged in sequence from bottom to top, the filter layer is laid on the seabed to prevent the loss of soil caused by the upward infiltration of the seabed soil, and ensure the stability of the seabed foundation, the armor layer is used to reinforce the offshore wind turbine single pile foundation, and the area of ​​the armor layer is smaller than the area of ​​the filter layer; several piles of rubble and several concrete pipes; The shell-filling net is arranged on the filter layer, and the gravel pile and the concrete pipe are laid on the filter layer at intervals.

2. The offshore wind turbine monopile foundation protection device based on natural design according to claim 1 is characterized in that: The concrete pipe is a low pH concrete pipe with a textured surface.

3. The offshore wind turbine monopile foundation protection device based on natural design according to claim 1 is characterized in that: The offshore wind turbine monopile foundation is a submarine cable; The offshore wind turbine monopile foundation protection device also includes a pebble layer, and the submarine cable sequentially covers the pebbles, the ecological mat and the shell filling net from the inside out.

4. The offshore wind turbine monopile foundation protection device based on natural design according to claim 1 is characterized in that: The shell-filled net is a net with shells arranged inside.

5. The offshore wind turbine monopile foundation protection device based on natural design according to claim 1 is characterized in that: The connecting rope group is a polypropylene rope.

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