A positioning leg for a wind power equipment installation and transport vessel

Abstract

This invention relates to a positioning leg for a wind turbine installation and transport vessel. The leg adopts a Reuleaux triangle structure, welded from three sections of steel plates, and is positioned by a clamping system. The clamping system has a cylindrical cross-section with protruding structures at the trisection points. These protruding structures are made of solid steel and correspond one-to-one with the three endpoints of the leg, achieving fixation through contact. This invention utilizes a Reuleaux triangle structure and a clamping system for positioning, resulting in more stable positioning compared to existing leg designs. The clamping system's trisection protrusions correspond rigidly to the three vertices of the leg, ensuring the main vessel is firmly positioned by a single pile. The Reuleaux triangle structure facilitates gripping by the clamping system. The leg's rigidity and deformation meet design requirements due to the welded three sections of steel plates.

Description

Technical Field

[0001] This invention relates to a wind turbine vessel, and more particularly to a positioning leg for a wind turbine installation and transport vessel, belonging to the technical field of shipbuilding and marine engineering. Background Technology

[0002] Existing pile legs generally adopt a cylindrical shape. The advantage of cylindrical pile legs is that their moment of inertia is the largest of all cross sections, so they have high stiffness and excellent strength, and have always been the mainstream form of pile leg design.

[0003] However, for the positioning legs on the side of the wind turbine installation and transport vessel, since the entire ship is located on the water surface and relies on single pile positioning, it is very different from the traditional four-leg positioning. Therefore, the more difficult problem in positioning this type of ship is how to ensure that the main hull being positioned can be firmly positioned by the single pile.

[0004] If traditional cylindrical pile legs are used, the friction of the contact surface is reduced by seawater in the marine environment, which greatly reduces the ability of the pile holding system. However, using triangular or quadrilateral pile legs, which are easier to grip, cannot meet the requirements for pile leg rigidity and deformation.

[0005] In summary, the main problem with the current pile leg design when applied to the monopile positioning mode of wind power equipment installation and transport vessels is unstable positioning. Summary of the Invention

[0006] To address the problem of unstable positioning when applying existing pile legs to wind turbine installation and transport vessels, this invention provides a positioning pile leg for wind turbine installation and transport vessels.

[0007] To achieve the above objectives, the technical solution of the present invention is: a positioning leg for a wind power equipment installation and transportation vessel. The leg adopts a Reilly triangle structure and is welded from three sections of steel plates. The positioning is achieved by holding the leg with a clamping system.

[0008] Furthermore, the cross-section of the pile-holding system is cylindrical, and a protruding structure is provided at the three equal division points; the protruding structure is made of solid steel.

[0009] Furthermore, the protruding structure corresponds one-to-one with the three end positions of the pile leg, and is fixed through the contact between the protruding structure and the pile leg.

[0010] Furthermore, the pile leg is welded from three steel plates with the same cross-sectional shape; the end faces of the two ends of the steel plates have the same shape.

[0011] Furthermore, one end of the steel plate is the load-bearing end, and the other end is the connecting end. The connecting end is thinner than the load-bearing end and thicker than the middle section of the steel plate.

[0012] Furthermore, the main diameter R0 of the pile leg is calculated based on the design sea conditions and operating water depth, and the calculation formula is W = M / S, where W is the minimum section modulus enclosed by the main diameter R0 of the pile leg, M is the maximum design bending moment of the pile leg, S is the allowable stress of the pile leg material, the inner diameter R1 of the bearing end is 0.15 to 0.25 times the main diameter R0 of the pile leg, and extends in an arc to the end face, and the outer diameter R3 of the bearing end does not exceed 0.04 times the outer diameter R0 of the pile leg, extends in an arc to the load application point, and then transitions straight to the end face.

[0013] Furthermore, the outer diameter of the connecting end is an arc surface of R0 extending directly to the end face, and the inner diameter R2 is in the range of 0.15 to 0.2 times the main diameter R0 of the pile leg, and extends to the end face in an arc shape.

[0014] Furthermore, the steel plates are directly produced by pouring molten steel into a mold; the welding between the steel plates is a full penetration weld.

[0015] Furthermore, the pile leg is surrounded and fixed to the side of the ship by the pile holding system. In the navigation state, it is placed horizontally on the side of the ship. In the positioning state, the pile holding system rotates to lower the pile leg, thereby achieving positioning.

[0016] Furthermore, the wind power equipment installation and transport vessel adopts monopile positioning, and the pile clamping system is arranged at a position 0.4L from the stern of the vessel, where L is the total length of the vessel; the length of the pile leg is ≤1.2L; and the operating water depth of the wind power equipment installation and transport vessel is ≤1.2L.

[0017] The beneficial effects of this invention are:

[0018] The present invention provides a positioning leg for a wind power equipment installation and transportation vessel, which adopts a Reilly triangle structure and achieves positioning by holding the leg with a clamping system, resulting in more stable positioning compared with existing leg types.

[0019] The pile-holding system uses three equally divided protrusions that correspond to and rigidly contact the three vertices of the pile leg, ensuring that the main hull being positioned can be firmly held in place by a single pile.

[0020] The use of the Leylow triangle structure makes it easier for the pile gripping system to grab the pile. The positioning pile legs are welded from three sections of steel plates, ensuring that the pile rigidity and deformation requirements meet the design specifications. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the pile-holding system and pile leg structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the pile leg positioning process;

[0023] Figure 3 This is a schematic diagram of the pile leg structure;

[0024] Figure 4 A schematic diagram showing the dimensions of the steel plate used to manufacture the pile legs. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] like Figure 1 As shown in Figure 2, the positioning leg of a wind turbine installation and transport vessel of the present invention is positioned by gripping the leg with a clamping system. The leg adopts a Reichstag triangle structure and is welded from three sections of steel plates with identical cross-sectional shapes. Figure 3 The pile legs are secured to the side of the ship by a pile-holding system. In the sailing state, the pile legs are placed horizontally on the side of the ship. In the positioning state, the pile-holding system rotates to lower the pile legs, thereby achieving positioning.

[0027] like Figure 4 As shown, the end faces of the two sections of the steel plate have the same shape. One end of the steel plate is the load-bearing end, which is thicker. The other end of the steel plate is the connecting end, which is smaller in shape compared to the load-bearing end, but thicker than the middle section of the steel plate. The inner diameter R1 of the load-bearing end is 0.15 to 0.25 times the main diameter R0 of the pile leg, and extends in an arc to the end face. The outer diameter R3 of the load-bearing end does not exceed 0.04 times the outer diameter R0 of the pile leg, extends in an arc to the point of application of the load, and then transitions straight to the end face. The outer diameter of the connecting end is R0, which extends directly to the end face in an arc. The inner diameter R2 is 0.15 to 0.2 times the main diameter R0 of the pile leg, and extends in an arc to the end face.

[0028] The steel plates are produced directly by pouring molten steel into a mold. The welding between the steel plates is a full penetration weld.

[0029] The pile clamping system has a cylindrical cross-section, with protruding structures at the three equal division points. These protruding structures are made of solid steel. Each of the three end points of the pile leg corresponds to a protruding structure, and the pile leg is secured through contact between the protruding structures and the pile leg.

[0030] The main diameter R0 of the pile leg is determined based on the design sea conditions and operating water depth, specifically calculated using the minimum profile modulus under the maximum combined load.

[0031] The wind turbine vessel uses monopile positioning, with the pile clamping system positioned 0.4L from the stern, where L is the total length of the vessel. To ensure easier control during navigation, the front of the pile legs is generally required not to extend beyond the main hull; therefore, the pile leg length should not exceed twice (1-0.4)L, i.e., 1.2L. The water depth for installation on the transport vessel should not exceed 1.2L.

[0032] Example:

[0033] Figure 1A schematic diagram of the pile clamping system 1 and the pile leg 2 is shown. The pile clamping system 1 has protrusions at three equally spaced points, which correspond to and rigidly contact the three vertices of the pile leg 2.

[0034] Figure 2 The process of positioning the pile legs is shown.

[0035] Figure 3 The pile leg structure is shown. It is made of three identical steel plates 22 welded together, with 21 being the weld seam.

[0036] Figure 4 A schematic diagram of the dimensions of steel plate 22 is shown, which is manufactured by casting molten steel. The main diameter R0 and thickness of the steel plate are comparable to those of a cylindrical pile leg, but can be designed according to sea conditions and operating water depth. R1 is (0.15R0, 0.25R0) to obtain a larger load-bearing end structure; R2 is (0.15R0, 0.2R0), and the cross-section near R2 is the same as the cross-section near R1, facilitating welding; R3 does not exceed R0 / 25.

[0037] Taking R0 = 4.8m, R1 = 0.9m, R2 = 0.9m, and R3 = 0.16m as an example, compared with a cylindrical pile leg with R0 = 4.8m, the minimum moment of inertia of the cross-section increased by 8.85% and the maximum moment of inertia of the cross-section increased by 9.19% when the cross-sectional area increased by 8.5%. In other words, with an 8.5% increase in steel weight, the moment of inertia, i.e., the structural stiffness, increased even more.

Claims

1. A positioning leg for a wind power equipment installation and transport vessel, characterized in that: The pile leg adopts a Reuleaux triangle structure, welded from three sections of steel plates, and is positioned by a piling clamping system. The pile leg is constructed from three sections of steel plates with identical cross-sectional shapes. The end faces of the two ends of each steel plate have the same shape. One end of each steel plate is the load-bearing end, and the corresponding end is the connecting end. The connecting end is thinner than the load-bearing end and thicker than the middle section of the steel plate. The main diameter R0 of the pile leg is calculated based on the design sea state and operating water depth using the formula W=M / S, where W is the main diameter R0 of the pile leg. The minimum section modulus enclosed by the sections, M is the maximum design bending moment of the pile leg, S is the allowable stress of the pile leg material, the inner diameter R1 of the bearing end is 0.15 to 0.25 times the main diameter R0 of the pile leg, and extends in an arc to the end face, the outer diameter R3 of the bearing end does not exceed 0.04 times the main diameter R0 of the pile leg, extends in an arc to the load application point, and then transitions straight to the end face; the outer diameter of the connecting end is R0 arc surface directly extending to the end face, the inner diameter R2 is 0.15 to 0.2 times the main diameter R0 of the pile leg, and extends in an arc to the end face.

2. The positioning legs of the wind power equipment installation and transportation vessel according to claim 1, characterized in that: The cross-section of the pile-holding system is cylindrical, and a protruding structure is provided at the three equal division points; the protruding structure is made of solid steel.

3. The positioning legs of the wind power equipment installation and transportation vessel according to claim 2, characterized in that: The protruding structure corresponds one-to-one with the three end positions of the pile leg, and is fixed by contact between the protruding structure and the pile leg.

4. The positioning legs of the wind power equipment installation and transportation vessel according to claim 1, characterized in that: The steel plates are produced directly by pouring molten steel into a mold; the welding between the steel plates is a full penetration weld.

5. The positioning legs of the wind power equipment installation and transportation vessel according to claim 1, characterized in that: The pile legs are fixed to the side of the ship by the pile holding system. In the sailing state, the pile legs are placed horizontally on the side of the ship. In the positioning state, the pile holding system rotates to lower the pile legs, thereby achieving positioning.

6. The positioning legs of the wind power equipment installation and transportation vessel according to claim 1, characterized in that: The wind power equipment installation and transport vessel adopts monopile positioning, and the pile clamping system is arranged at a position 0.4L from the stern of the vessel, where L is the total length of the vessel; the length of the pile leg is ≤1.2L; the operating water depth of the wind power equipment installation and transport vessel is ≤1.2L.

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