Floating offshore wind power suction anchor foundation mooring lifting lug structure

Abstract

The utility model relates to a floating type offshore wind power suction anchor foundation mooring lifting lug structure which comprises a suction anchor cylinder body, a main eye plate and a cylinder body thickening plate, the cylinder body thickening plate is fixed on the inner side wall of the suction anchor cylinder body, the main eye plate is fixed on the outer side surface of the suction anchor cylinder body, and the cylinder body thickening plate is fixed on the inner side wall of the suction anchor cylinder body. The main eye plate penetrates through the side wall of the suction anchor cylinder and the cylinder thickening plate and is fixedly connected with a first connecting plate, a second connecting plate is fixed to the other side of the first connecting plate, and the second connecting plate is fixed to the inner side wall of the other side of the suction anchor cylinder. According to the utility model, the suction anchor cylinder body can form a whole with a stable structure.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power and marine engineering structure foundation anchoring, in particular to a floating offshore wind power suction anchor foundation mooring lug structure. Background Art

[0002] The depletion of fossil energy and global warming have become common problems facing the world. Large-scale development of renewable energy and reduction of carbon emissions have become the consensus of human society. Offshore wind power has maintained a strong development trend due to its advantages such as less adverse impact on the environment, relatively stable wind speed and proximity to power load centers. With the development of wind energy, offshore wind power has gradually shifted to deep seas. Floating foundations have received more attention due to their less restricted characteristics by water depth. The choice of anchor foundation buried in the seabed is also crucial. In recent years, suction anchors have been increasingly selected as the anchor foundation of mooring systems.

[0003] As an offshore floating structure, floating wind turbines need to be constrained in position and movement by a mooring system. Its mechanical action mechanism mainly provides constrained tension through the deformation of mooring materials or the change of suspended weight. The suction anchor is a cylindrical structure with a closed top and an open bottom. It is inserted into the seabed to form an anchor foundation through its own weight and the internal and external pressure difference. The suction anchor is connected to the floating foundation buoy structure by a mooring cable. The mooring cable can be an anchor chain, a wire rope or a synthetic fiber rope. The mooring cable is divided into a tensioned mooring method and a catenary mooring method. The restoring force of the catenary mooring line type is provided by the weight of its suspended section itself when the platform moves less. When the platform responds to a larger movement, the mud section may be pulled up and suspended in the air, and the anchor provides the restoring force. The mooring lug is a structure connecting the catenary and the suction cylinder. When subjected to the mooring load, the chain tension is transmitted to the lug eye plate through the shackle, and then transmitted to the suction anchor cylinder through the reinforcing plate. The suction anchor foundation structure faces many technical difficulties, such as the chain tension cannot be directly transmitted to the suction anchor cylinder when subjected to mooring loads, and the insufficient in-situ bearing capacity of the eye plate of the traditional suction anchor foundation structure. Utility Model Content

[0004] The utility model aims to provide a floating offshore wind power suction anchor foundation mooring lug structure, which can make the suction anchor cylinder form a stable structure as a whole.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a floating offshore wind power suction anchor foundation mooring ear structure, comprising a suction anchor cylinder, a main eye plate and a cylinder thickening plate, wherein the cylinder thickening plate is fixed to the inner side wall of the suction anchor cylinder, the main eye plate is fixed to the outer surface of the suction anchor cylinder, the main eye plate penetrates the suction anchor cylinder side wall and the cylinder thickening plate, and is fixedly connected to a first connecting plate, a second connecting plate is fixed to the other side of the first connecting plate, and the second connecting plate is fixed to the inner side wall on the other side of the suction anchor cylinder.

[0006] Furthermore, first stiffening plates are symmetrically fixed on both sides of the first connecting plate, and the other end of the first stiffening plate is fixed to the cylinder thickening plate.

[0007] Furthermore, second stiffening plates are symmetrically fixed on both sides of the second connecting plate, and the other end of the second stiffening plate is fixed to the inner side wall of the other side of the suction anchor cylinder.

[0008] Furthermore, reinforcement plates are provided on both sides of the main eye plate.

[0009] Furthermore, the cross-section of the reinforcing plate is a circular shape with holes.

[0010] Furthermore, the thickness of the reinforcement plate is smaller than that of the main eye plate.

[0011] Furthermore, the cross-sectional shapes of the first connecting plate, the second connecting plate, the first stiffening plate and the second stiffening plate are all T-shaped.

[0012] Furthermore, the suction anchor cylinder is a hollow cylindrical structure with an open lower surface.

[0013] Furthermore, the thickness of the first stiffening plate is greater than the thickness of the second stiffening plate.

[0014] Beneficial effects of the utility model: The utility model has the characteristics of simple structure, reasonable force, high bearing capacity and easy construction, which effectively solves the problem that the chain tension in the suction anchor cannot be directly transmitted to the suction anchor cylinder, and realizes the effective anchoring of the floating foundation, which can effectively save the construction cost of the suction anchor pile. In particular:

[0015] (1) By setting reinforcement plates on both sides of the main eye plate and the cylinder thickening plate located on the suction anchor cylinder, the rigidity of the eye plate structure and its bearing capacity for mooring loads are significantly improved, making the eye plate structure of the suction anchor foundation less likely to deform. This can not only achieve a reliable connection between the suction anchor foundation eye plate structure and the catenary shackle during the in-situ service stage, but also realize the reuse of the eye plate structure.

[0016] (2) The first connecting plate, the second connecting plate, the first stiffening plate and the second stiffening plate are provided to improve the stiffness of the suction anchor cylinder, thereby preventing the suction anchor cylinder from being deformed when the main eye plate and the reinforcement plate are subjected to the mooring load transmitted by the catenary.

[0017] (3) By designing the cross-sectional shape of the main eye plate, the first connecting plate, the second connecting plate, the first stiffening plate and the second stiffening plate into a T-shape, the load-bearing force of the structure is more reasonably balanced, and it can better withstand the pressure and bending torsion force perpendicular to the axial direction, and is not prone to overturning and deformation. The T-shaped cross-sectional shape can also reduce the amount of materials used and the deadweight of the structure, and has obvious advantages in terms of construction convenience and material cost.

[0018] (4) The materials used in the present invention are EH36Z35 and DH36, which have the characteristics of high strength, high toughness, fatigue resistance, seawater corrosion resistance, good welding performance, and are easier to process and manufacture. The materials can also better withstand the high load and harsh environment of the seabed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall layout diagram of the suction anchor of the utility model;

[0020] Figure 2 It is a schematic diagram of the internal structure of the suction anchor of the utility model;

[0021] Figure 3 It is a schematic diagram of the longitudinal section structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the longitudinal section structure of the main eye plate of the utility model;

[0023] Figure 5 It is a cross-sectional structural schematic diagram of the utility model;

[0024] Figure 6 It is a partially enlarged schematic diagram of the cross section of the mooring eye plate of the utility model;

[0025] Figure 7 This is a schematic diagram of the hoisting of the suction anchor foundation eye plate structure of the utility model;

[0026] Figure 8 It is a schematic diagram of the suction anchor foundation eye plate structure in situ working.

[0027] Among them: 1. main eye plate, 2. reinforcement plate, 3. cylinder thickening plate, 4. first stiffening plate, 5. first connecting plate, 6. second connecting plate, 7. second stiffening plate, 8. suction anchor cylinder. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings. For better understanding, the orientation of the present invention is described according to the orientation shown in the accompanying drawings and cannot be understood as a limitation of the present application; the following terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] See also Figures 1 to 8 The utility model provides an embodiment: a floating offshore wind power suction anchor foundation mooring ear structure, comprising a suction anchor cylinder 8, a main eye plate 1 and a cylinder thickening plate 3, wherein the cylinder thickening plate 3 is fixed on the inner side wall of the suction anchor cylinder 8, and the main eye plate 1 is fixed on the outer surface of the suction anchor cylinder 8, and the main eye plate 1 penetrates the side wall of the suction anchor cylinder 8 and the cylinder thickening plate 3, and is fixedly connected with a first connecting plate 5, and a second connecting plate 6 is fixed on the other side of the first connecting plate 5, and the second connecting plate 6 is fixed on the inner side wall of the other side of the suction anchor cylinder 8. The main eye plate 1 is a separate integral steel plate, and the main eye plate 1 passes through the suction anchor cylinder 8 and the cylinder thickening plate 3 and then welds them, and the curvature of the cylinder thickening plate 3 is consistent with the curvature of the suction anchor cylinder 8, and its length, width and thickness are related to the force condition of the eye plate, and the material adopts Z-direction performance ship steel plate EH36-Z35 steel. The cylinder thickening plate 3 cooperates with the first connecting plate 5 and the second connecting plate 6 to allow the suction anchor cylinder 8 to form a stable structural whole. The first connecting plate 5 and the second connecting plate 6 are made of EH36-Z35.

[0030] Please continue reading Figure 2 , Figure 5 As shown, in one embodiment of the utility model, the first stiffening plates 4 are symmetrically fixed on both sides of the first connecting plate 5, and the other end of the first stiffening plate 4 is fixed on the cylinder thickening plate 3. The material of the first stiffening plate 4 is DH36. Compared with ordinary steel, the material used in the utility model not only has better corrosion resistance to adapt to the corrosion challenges in the marine environment; it also has higher strength and toughness to cope with deep sea currents and loads; it also has better weldability to meet the connection reliability of the structure of the utility model.

[0031] Please continue reading Figure 2 , Figure 5As shown, in one embodiment of the utility model, the second stiffening plates 7 are symmetrically fixed on both sides of the second connecting plate 6, and the other end of the second stiffening plate 7 is fixed to the inner side wall on the other side of the suction anchor cylinder 8. The material of the second stiffening plate 7 is DH36, and a stable suction anchor foundation eye plate structure is formed as a whole with the connecting plate and the stiffening plate and the suction anchor cylinder 8. When the suction anchor is subjected to the catenary mooring load, the suction anchor cylinder 8 has a large stress at the eye plate. In order to prevent the suction anchor cylinder structure from deforming, the first connecting plate 5, the second connecting plate 6, the first stiffening plate 4 and the second clamping plate are used to further reinforce the suction anchor cylinder 8 at the eye plate. The reinforced suction anchor cylinder 8 structure has greater rigidity and stronger bearing capacity. Among them, the main eye plate 1, the connecting plate and the stiffening plate achieve the purpose of reducing the dead weight and saving materials by changing the thickness.

[0032] Please continue reading Figure 2 , Figure 3 As shown, in one embodiment of the utility model, reinforcing plates 2 are arranged on both sides of the main eye plate 1. The structures of the reinforcing plates 2 are exactly the same, and the main eye plate 1 and the reinforcing plates 2 on both sides thereof are made of EH36-Z35 steel. Since the eye plate is subjected to the load transmitted by the catenary during the in-situ service process, according to the results obtained after finite element analysis, the main eye plate 1 and the suction anchor cylinder 8 at the eye plate hole position are prone to stress concentration, so the reinforcing plates 2 are arranged at these two positions as a reinforcing structure to solve the problem of excessive stress.

[0033] Please continue reading Figure 2 , Figure 3 As shown, in one embodiment of the present invention, the cross section of the reinforcing plate 2 is a circular shape with holes, which can fit the structure of the hanging ears of the main eye plate 1.

[0034] Please continue reading Figure 5 As shown, in one embodiment of the utility model, the thickness of the reinforcing plate 2 is smaller than that of the main eye plate 1 .

[0035] Please continue reading Figures 1 to 6 As shown, in one embodiment of the utility model, the cross-sectional shapes of the first connecting plate 5, the second connecting plate 6, the first stiffening plate 4 and the second stiffening plate 7 are all T-shaped. The cross-sectional shapes of the connecting plate, the first stiffening plate 4 and the second stiffening plate 7 are all T-shaped, that is, a rectangular shape with rounded chamfers dug out from the upper and lower sides of a rectangular steel plate. The T-shaped shape makes the load-bearing force of the structure more reasonably balanced, and can better withstand pressure and bending torsional forces perpendicular to the axial direction, and is not prone to overturning and deformation. The T-shaped cross-sectional shape can also reduce the amount of material used and reduce the deadweight of the structure, and has obvious advantages in terms of construction convenience and material costs.

[0036] Please continue reading Figure 1 , Figure 2 As shown, in one embodiment of the present invention, the suction anchor cylinder 8 is a hollow cylindrical structure with an open lower surface.

[0037] Please continue reading Figure 5 As shown, in one embodiment of the utility model, the thickness of the first stiffening plate 4 is greater than the thickness of the second stiffening plate 7 .

[0038] The utility model has the following working principle: before the suction anchor is hoisted, the shackle and the catenary need to be installed on the eye plate in advance, and the position of the catenary should be fixed during hoisting, so that after the suction anchor is sunk into the mud, the pulling direction of the shackle on the eye plate is obliquely upward on the plane.

[0039] The above description is only a preferred embodiment of the present utility model and cannot be understood as a limitation of the present application. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the present utility model.

Claims

1. A floating offshore wind power suction anchor foundation mooring lug structure, characterized in that: It includes a suction anchor cylinder, a main eye plate and a cylinder thickening plate, wherein the cylinder thickening plate is fixed to the inner side wall of the suction anchor cylinder, the main eye plate is fixed to the outer surface of the suction anchor cylinder, the main eye plate penetrates the suction anchor cylinder side wall and the cylinder thickening plate, and is fixedly connected with a first connecting plate, a second connecting plate is fixed to the other side of the first connecting plate, and the second connecting plate is fixed to the inner side wall on the other side of the suction anchor cylinder.

2. A floating offshore wind power suction anchor foundation mooring lug structure according to claim 1, characterized in that: First stiffening plates are symmetrically fixed on both sides of the first connecting plate, and the other end of the first stiffening plate is fixed on the cylinder thickening plate.

3. A floating offshore wind power suction anchor foundation mooring lug structure according to claim 2, characterized in that: Second stiffening plates are symmetrically fixed on both sides of the second connecting plate, and the other end of the second stiffening plate is fixed to the inner side wall on the other side of the suction anchor cylinder.

4. A floating offshore wind power suction anchor foundation mooring lug structure according to claim 1, characterized in that: Reinforcement plates are arranged on both sides of the main eye plate.

5. A floating offshore wind power suction anchor foundation mooring lug structure according to claim 4, characterized in that: The cross section of the reinforcing plate is a circular shape with holes.

6. A floating offshore wind power suction anchor foundation mooring lug structure according to claim 4, characterized in that: The thickness of the reinforcing plate is smaller than that of the main eye plate.

7. A floating offshore wind power suction anchor foundation mooring lug structure according to claim 3, characterized in that: The cross-sectional shapes of the first connecting plate, the second connecting plate, the first stiffening plate and the second stiffening plate are all T-shaped.

8. The floating offshore wind power suction anchor foundation mooring lug structure according to claim 1, characterized in that: The suction anchor cylinder is a hollow cylindrical structure with an open lower surface.

9. A floating offshore wind power suction anchor foundation mooring lug structure according to claim 3, characterized in that: The thickness of the first stiffening plate is greater than the thickness of the second stiffening plate.

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