Sleeve type anti-scouring structure for offshore wind power single pile foundation

Abstract

The utility model provides a sleeve type anti-scour structure of an offshore wind power single pile foundation, the anti-scour structure is sleeved on the outer side of a single pile, the surface of the anti-scour structure is provided with a plurality of rows of turbulent flow bulges which are arranged in a staggered manner, the anti-scour structure is directly sleeved on the outer side of a soil body around the pile, the direction of water flow is adjusted through the design of the turbulent flow bulges, and continuous upward flow is generated. The original flowing mode is changed, so that the scouring effect of water flow on soil around the pile is remarkably reduced, the protection effect is enhanced, and the offshore operation cost and potential cable faults are reduced; the structure and the installation process are simple, transportation of rocks, sand bags and the like is not needed, and the construction cost and the influence on the environment are reduced; a non-invasive method is provided for protecting the single pile, and the integrity and the service life of the single pile are kept; special equipment is not needed for scrap recovery, so that the maintenance cost is reduced; when the cable is used with antifouling paint, marine organisms can be prevented from accumulating on the cable.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power monopile foundation protection, in particular to an offshore wind power monopile foundation sleeve type anti-scour structure. Background Art

[0002] Offshore wind power monopile foundations are usually composed of a single large-diameter steel pipe, with the lower part deep in the soil to provide bearing capacity; the middle part is immersed in water to withstand long-term marine environmental effects such as waves, currents, tides, and marine biological growth; the upper part is connected to the wind turbine tower through a flange. As the simplest type of offshore wind turbine foundation, the monopile foundation is currently the dominant foundation structure for offshore wind power.

[0003] After the single pile foundation is sunk, the movement pattern of water particles caused by tides and waves will be significantly affected. A horseshoe vortex will be formed in front of the single pile foundation's upstream part, and a vortex Karman vortex street will be formed behind the single pile foundation's downstream part. The streamlines on both sides of the single pile foundation will shrink. This change in local flow pattern will increase the shear stress of the water flow on the bottom bed, thereby improving the water flow's ability to carry sand. If the bottom bed is susceptible to erosion, scour pits will form locally in the single pile foundation, which will affect the stability of the structure.

[0004] In view of the problem that the single pile foundation of offshore wind power is easily damaged by scour, the current projects mostly adopt bottom protection and scour reduction measures, which mainly use protective layers such as riprap, sand bags, sand blankets, etc. to cover the scour-affected areas around the pile foundation. However, it cannot effectively isolate the water flow around the pile, and it is difficult to achieve reliable scour protection effect. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a sleeve-type anti-scour structure for an offshore wind power monopile foundation, which can solve the problem that the offshore wind power monopile foundation is easily damaged by scour.

[0006] To this end, the utility model adopts the following technical solutions:

[0007] A sleeve-type anti-scour structure for an offshore wind power monopile foundation. The anti-scour structure is sleeved on the outside of the monopile, and a surface of the anti-scour structure is provided with a plurality of rows of staggered spoiler protrusions.

[0008] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0009] The bottom surface of the anti-scour structure is located on the seabed surface, and the top surface of the anti-scour structure is above the water surface.

[0010] The anti-scour structure comprises a first anti-scour block and a second anti-scour block. The first anti-scour block and the second anti-scour block are assembled to form a sleeve. The sleeve is sleeved on the outside of the single pile. A plurality of the sleeves are sleeved in the height direction of the single pile.

[0011] The joint seam between the first anti-scour block and the second anti-scour block is a continuous longitudinal serrated joint seam, and the joint seam between the upper and lower sleeves is a continuous circumferential serrated joint seam. The first anti-scour block and the second anti-scour block and the upper and lower sleeves are fixedly connected by a plurality of screws, and the plurality of screws are distributed between the longitudinal serrated joint seam and the circumferential serrated joint seam.

[0012] Lifting holes are provided on the upper parts of the first anti-scour block and the second anti-scour block.

[0013] A plurality of rubber pads are arranged between the flushing structure and the single pile.

[0014] The outer surface of the anti-scour structure is provided with an anti-fouling coating.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects: the anti-scouring structure is directly sleeved on the outside of the soil around the pile, and the direction of the water flow is adjusted by the design of the spoiler protrusion, so as to generate a continuous upward flow and change the original flow pattern, thereby significantly reducing the scouring effect of the water flow on the soil around the pile, enhancing the protection effect, reducing the cost of offshore operations and potential cable failures; the structure and installation process are simple, and there is no need to transport rocks and sand bags, etc., which reduces the construction cost and the impact on the environment; it provides a non-invasive method to protect the single pile and maintain its integrity and service life; no special equipment is required for scrapping and recycling, which reduces maintenance costs; when used together with anti-fouling paint, it can prevent marine organisms from accumulating on the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the sleeve structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the installation process of the utility model.

[0018] Figure 3 It is a schematic diagram of the structure inside the sleeve of the utility model.

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the sleeve of the utility model. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the preferred implementation scheme of the present utility model is described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent elements with the same or similar functions. However, it should be understood that the accompanying drawings are only used for illustrative purposes and cannot be understood as limitations on the present utility model. In order to better illustrate the present embodiment, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted, and the positional relationship described in the accompanying drawings is only used for illustrative purposes and cannot be understood as limitations on the present utility model.

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0022] The utility model provides a sleeve-type anti-scour structure for an offshore wind power monopile foundation. The anti-scour structure 2 is sleeved on the outside of the monopile 1, and the surface of the anti-scour structure 2 is provided with a plurality of rows of staggered spoiler protrusions 3.

[0023] The spoiler protrusions 2 are regular triangle protrusions with their bases parallel to the seabed surface. The spoiler protrusions 2 in two adjacent rows are regularly arranged and staggered.

[0024] The bottom surface of the anti-scour structure 2 is located on the seabed surface, and the top surface of the anti-scour structure 2 is above the water surface.

[0025] The anti-scour structure 2 includes a first anti-scour block 21 and a second anti-scour block 22. The first anti-scour block 21 and the second anti-scour block 22 are assembled to form a sleeve. The sleeve is sleeved on the outside of the single pile 1. A plurality of sleeves are sleeved in the height direction of the single pile 1.

[0026] The sleeve is made of a lightweight composite material.

[0027] The joint seam between the first anti-scour block 21 and the second anti-scour block 22 is a continuous longitudinal serrated seam, and the joint seam between the upper and lower sleeves is a continuous circumferential serrated seam. The first anti-scour block 21 and the second anti-scour block 22 and the upper and lower sleeves are fixedly connected by a plurality of screws 9, and the plurality of screws 9 are distributed between the longitudinal serrated seam and the circumferential serrated seam.

[0028] The longitudinal serrated seams and the circumferential serrated seams are continuous V-shaped serrated seams, and the V-shaped angle is 120 degrees.

[0029] Lifting holes 5 are provided on the upper parts of the first anti-scour block 21 and the second anti-scour block 22 .

[0030] A number of rubber pads 7 are provided between the scouring structure 2 and the monopile 1 .

[0031] The rubber pad 7 on the inner side of the scouring structure 2 contacts the outer surface of the single pile 1 and is made of water-swellable waterproof rubber made of water-absorbing materials such as water-soluble polyurethane prepolymer and sodium acrylate polymer water-absorbing resin and synthetic rubber such as natural rubber and chloroprene rubber.

[0032] The outer surface of the anti-scour structure 2 is provided with an anti-fouling coating.

[0033] The diameter of the single pile 1 described in this embodiment is 6m, and the radius of the scour impact area around the pile foundation is estimated to be 14m. The inner diameter of the sleeve is determined based on the outer diameter of the single pile 1 and the size of the upper pile rooting piece, which is slightly larger than the outer contour of the rooting piece, so that the sleeve can be smoothly hoisted to the designed position. The number of sleeves is determined based on the height of the single pile 1 between the water surface and the seabed surface. The rubber pad 7 prevents the sleeve 2 from shifting. The position of the lifting hole 5 is 1m away from the upper edge of the first anti-scour block 21 and the second anti-scour block 22.

[0034] The specific construction method of a sleeve-type anti-scour structure for an offshore wind power monopile foundation of this embodiment is as follows: the sleeve-type anti-scour structure is prefabricated on land as a whole, and the surface of the anti-scour structure 2 needs to be prepared with anti-corrosion measures in advance and coated with an anti-fouling coating;

[0035] The first anti-scour block 21 and the second anti-scour block 22 are fixed firmly by screws 9 to form a partial sleeve, and then the sleeve-type anti-scour structure is transported to the construction site in this state;

[0036] After the pile 1 is sunk, the sleeve is lifted by a crane through the lifting hole 5, and is slowly lowered from above the pile 1 into the pile 1 until the sleeve contacts the seabed.

[0037] If multiple sleeves are needed, operate them one by one, and pay attention to whether the edges of the upper and lower adjacent sleeves are in contact when lowering;

[0038] If the components arranged on the single pile 1 affect the direct hanging installation of the sleeve, the first anti-scour assembly 21 and the second anti-scour assembly 22 can be hoisted separately through the hoisting hole 5 by a crane, and the two can be assembled into a sleeve outside the single pile 1 at a suitable height, and the construction personnel (the construction personnel who need to dive in the underwater part) can install screws 9 to fix the two to the outside of the single pile 1.

[0039] The rubber pad 7 on the inner side of the sleeve swells when it comes into contact with water, and the gap between the inner side of the sleeve and the outer side of the single pile 1 is filled, making the overall structure more solid;

[0040] After the final construction is completed, the water flow passing through the pile foundation adjusts the direction of the water flow through the spoiler protrusions 3 on the surface of the anti-scour structure 2, generating a continuous upward flow, thereby changing the original flow pattern and playing an anti-scour protection role.

[0041] According to the description and drawings of the utility model, those skilled in the art can easily manufacture or use the offshore wind power single pile foundation sleeve type anti-scour structure of the utility model, and can produce the positive effects recorded in the utility model.

[0042] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two mechanisms, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0043] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "inside", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the mechanism or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "first" and "second" are also used only for the simplicity of description, and do not indicate or imply relative importance.

[0044] Furthermore, in practicing the claims of the present invention, those skilled in the art may understand and affect variations to the disclosed embodiments by studying the drawings, disclosure, and appended claims. In addition, in the claims and the specification, words such as "comprises", "comprising", etc. do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0045] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. A sleeve-type anti-scour structure for an offshore wind power monopile foundation, wherein the anti-scour structure (2) is sleeved on the outside of the monopile (1), and is characterized in that: The surface of the anti-scour structure (2) is provided with a plurality of rows of staggered spoiler protrusions (3), the anti-scour structure (2) comprises a first anti-scour block (21) and a second anti-scour block (22), the first anti-scour block (21) and the second anti-scour block (22) are assembled to form a sleeve, the sleeve is sleeved on the outside of the single pile (1), a plurality of the sleeves are sleeved in the height direction of the single pile (1), the upper parts of the first anti-scour block (21) and the second anti-scour block (22) are both provided with lifting holes (5), and a plurality of rubber pads (7) are provided between the scour structure (2) and the single pile (1).

2. The offshore wind power monopile foundation sleeve type anti-scour structure according to claim 1, characterized in that: The bottom surface of the anti-scour structure (2) is located on the seabed surface, and the top surface of the anti-scour structure (2) is above the water surface.

3. The offshore wind power monopile foundation sleeve type anti-scour structure according to claim 1, characterized in that: The joint seam between the first anti-scour block (21) and the second anti-scour block (22) is a continuous longitudinal serrated joint seam, and the joint seam between the upper and lower sleeves is a continuous circumferential serrated joint seam. The first anti-scour block (21) and the second anti-scour block (22) and the upper and lower sleeves are fixedly connected by a plurality of screws (9), and the plurality of screws (9) are distributed between the longitudinal serrated joint seam and the circumferential serrated joint seam.

4. The offshore wind power monopile foundation sleeve type anti-scour structure according to claim 1, characterized in that: The outer surface of the anti-scour structure (2) is provided with an anti-fouling coating.

Images