High-strength stainless steel-high-strength steel composite steel tower drum structure for offshore wind power

Abstract

The utility model discloses an offshore wind power high-strength stainless steel-high-strength steel composite steel tower tube structure, which relates to the technical field of civil engineering and comprises a tower tube body, an upper flange plate, a lower flange plate and spiral stiffening ribs, the tower tube body is a circular truncated cone-shaped tube body, the upper flange plate is arranged at the top in the tower tube body, and the lower flange plate is arranged at the bottom in the tower tube body. The spiral stiffening rib is arranged on the inner side of the tower drum body, the top end of the spiral stiffening rib is connected to the upper flange plate, the bottom end of the spiral stiffening rib is connected to the lower flange plate, more than two welding points are evenly arranged on the spiral stiffening rib, and the spiral stiffening rib is welded and fixed to the drum wall of the tower drum body through the welding points. According to the offshore wind power high-strength stainless steel-high-strength steel composite steel tower tube structure, the bearing performance, the durability and the applicability in ocean engineering of a common steel structure can be improved.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, and more specifically, to a high-strength stainless steel-high-strength steel composite steel tower structure for offshore wind power. Background Technology

[0002] Steel structures are widely used in engineering fields due to their excellent mechanical properties. In recent years, with the development of marine foundation engineering in my country, steel structures have also been widely used in wind turbine towers, offshore platforms, subsea pipelines, and other engineering fields.

[0003] However, the application of traditional ordinary steel structures in marine engineering has also revealed drawbacks such as low load-bearing efficiency and high operation and maintenance costs. Specifically: 1. The production of traditional steel relies on blast furnace steelmaking, which consumes a lot of energy and has a high carbon emission intensity; 2. Offshore wind turbine towers are exposed to high salt spray and high humidity environments for a long time, making ordinary steel prone to electrochemical corrosion and stress corrosion cracking, requiring frequent anti-corrosion coating, which increases operation and maintenance costs; 3. Due to the low strength of traditional ordinary steel structures, increasing the load-bearing capacity will inevitably increase the wall thickness or diameter of the steel pipe, resulting in a sharp increase in weight and cost, making it difficult to meet the load-bearing requirements of deep-sea wind power at a reasonable cost; 4. Offshore wind turbine structures are subjected to a variety of loads in complex marine environments. These loads have dynamic, random, and coupled characteristics. Traditional circumferential stiffeners or longitudinal stiffeners mainly resist loads in a single direction, which is difficult to guarantee the stability of the tower structure under complex loads in deep sea. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model proposes a high-strength stainless steel-high-strength steel composite steel tower structure for offshore wind power, which can improve the load-bearing capacity, durability, and applicability of ordinary steel structures in marine engineering.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a high-strength stainless steel-high-strength steel composite tower structure for offshore wind power, including a tower body, an upper flange plate, a lower flange plate, and spiral stiffening ribs. The tower body is a frustum-shaped cylinder. An upper flange plate is provided at the top of the tower body, and a lower flange plate is provided at the bottom of the tower body. Spiral stiffening ribs are provided on the inner side of the tower body, with the top end of the spiral stiffening ribs connected to the upper flange plate and the bottom end of the spiral stiffening ribs connected to the lower flange plate. Two or more welding points are evenly provided on the spiral stiffening ribs, and the spiral stiffening ribs are welded and fixed to the cylinder wall of the tower body through the welding points.

[0007] In a preferred embodiment of this invention, the thickness of the spiral stiffening rib is 0.3 to 0.5 times the thickness of the tower body.

[0008] In a preferred embodiment of this invention, the width of the spiral stiffening rib is 1 / 16 to 1 / 13 of the average diameter of the tower body.

[0009] In a preferred embodiment of this invention, the tower body comprises an outer high-strength stainless steel cylinder and an inner high-strength steel cylinder, wherein the wall thickness of the inner high-strength steel cylinder is not less than the wall thickness of the outer high-strength stainless steel cylinder.

[0010] In a preferred embodiment of this invention, the spiral stiffening rib is a trapezoidal corrugated plate.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. High-strength stainless steel is used as the composite material and high-strength steel is used as the base material to form a high-strength stainless steel-high-strength steel composite plate through a composite process. The tower body is made using this composite steel plate. It not only has high strength, but also excellent corrosion resistance and obvious cost advantages throughout the entire life cycle. It can effectively solve the current problem of poor load-bearing capacity and durability of wind power structures, and break through the obstacles that restrict the high-quality development of the deep-sea wind power industry.

[0013] 2. The high-strength stainless steel pipes on the outside of the tower body protect the internal structure from corrosion, fundamentally solving the problem of marine corrosion and reducing operation and maintenance costs; the high-strength steel pipes on the inside of the tower body improve the mechanical properties and ductility of the structure.

[0014] 3. The tower body adopts a hollow tube design, which meets the needs of special buildings such as wind turbine towers and offshore platforms that require large internal spaces, thus improving the applicability of the tower structure in marine engineering.

[0015] 4. Compared with traditional circumferential or longitudinal stiffeners, the oblique distribution of helical stiffeners can transmit loads more evenly, improve overall stability, and the helical stiffeners form a continuous mechanical path, which can more efficiently transfer the stress in different areas of the tower to the foundation and reduce local stress concentration.

[0016] 5. The trapezoidal corrugated structure with spiral stiffeners significantly enhances the bending resistance of the tower structure by increasing the moment of inertia of the cross section. It is especially suitable for bearing the bending moment generated by wind loads and the weight of the top equipment. Furthermore, the geometry of the trapezoidal corrugations provides higher strength with the same amount of material. Compared with a flat cross section, it can reduce the wall thickness and reduce the weight of the tower, making it better suited for the harsh service environment in the ocean.

[0017] 6. The tower structure adopts a segmented assembly method, which has great application potential in deep-sea wind power towers and floating foundation structures. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the high-strength stainless steel-high-strength steel composite steel tower structure for offshore wind power provided in a specific embodiment of this utility model.

[0019] Figure 2 yes Figure 1 A half-section view from the front view direction;

[0020] Figure 3 yes Figure 2 A partial structural diagram of the helical stiffener.

[0021] In the picture:

[0022] 1. Tower body; 11. Outer high-strength stainless steel cylinder; 12. Inner high-strength steel cylinder; 2. Upper flange plate; 3. Lower flange plate; 4. Spiral stiffening ribs. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-3 As shown in the embodiment, a high-strength stainless steel-high-strength steel composite tower structure for offshore wind power is provided, including a tower body 1, an upper flange plate 2, a lower flange plate 3, and spiral stiffening ribs 4. The tower body 1 is a frustum-shaped cylinder. The upper flange plate 2 is provided at the top inside the tower body 1, and the lower flange plate 3 is provided at the bottom inside the tower body 1. The spiral stiffening ribs 4 are provided on the inner side of the tower body 1, and the top end of the spiral stiffening ribs 4 is connected to the upper flange plate 2, and the bottom end of the spiral stiffening ribs 4 is connected to the lower flange plate 3. Two or more welding points are evenly arranged on the spiral stiffening ribs 4, and the spiral stiffening ribs 4 are welded and fixed to the cylinder wall of the tower body 1 through the welding points. In this embodiment, the diameter of the top end of the tower body 1 is smaller than the diameter of the bottom end of the tower body 1, and both the upper flange plate 2 and the lower flange plate 3 are welded and fixed to the inner wall of the tower body 1. Both the upper flange plate 2 and the lower flange plate 3 are provided with bolt holes, which allows several tower bodies 1 to be vertically spliced ​​to form a larger tower structure, which has great application potential in deep-sea wind power towers and floating foundation structures. The helical stiffening ribs 4 are set against the inner wall of the tower body 1, so that they can resist axial compression, bending and torsional loads at the same time. By dispersing stress concentration points, they delay the occurrence of local buckling. At the same time, the helical stiffening ribs 4 can also form a continuous mechanical path, which can more efficiently transfer the stress in different areas of the tower body 1 to the lower foundation and reduce local stress concentration.

[0025] Specifically, the thickness of the spiral stiffening rib 4 is 0.3 to 0.5 times the thickness of the tower body 1.

[0026] Specifically, the width of the spiral stiffening rib 4 is 1 / 16 to 1 / 13 of the average diameter of the tower body 1.

[0027] Specifically, the tower body 1 includes an outer high-strength stainless steel cylinder 11 and an inner high-strength steel cylinder 12, and the wall thickness of the inner high-strength steel cylinder 12 is not less than the wall thickness of the outer high-strength stainless steel cylinder 11. In this embodiment, the outer high-strength stainless steel cylinder 11 is made of QN1803 high-strength stainless steel and has a frustum-shaped structure. The upper and lower cross-sectional diameters, height, and thickness of the outer high-strength stainless steel cylinder 11 vary with the column design. The inner high-strength steel cylinder 12 is made of Q460 or higher grade high-strength steel and has a frustum-shaped structure. The upper and lower cross-sectional diameters, height, and thickness of the inner high-strength steel cylinder 12 vary with the dimensions of the outer high-strength stainless steel cylinder 11 and the column design. In addition, the preparation process of the tower body 1 is as follows: high-strength stainless steel is used as the composite material and high-strength steel is used as the base material. A high-strength stainless steel-high-strength steel composite plate is formed through a composite process. Then, arc-shaped steel plates of corresponding sizes are cut out from the high-strength stainless steel-high-strength steel composite plate, and they are rolled into corresponding frustum-shaped steel pipes through a rolling process. Then, butt welding is performed at the joint. Note that a bevel is opened at the joint before welding to increase the contact area of ​​the weld.

[0028] Specifically, the spiral stiffening rib 4 is a trapezoidal corrugated plate.

[0029] This embodiment also provides a method for manufacturing and installing spiral stiffening ribs, including the following steps:

[0030] Step 1: Select steel strips of a certain thickness and cut them into strip-shaped stiffening ribs of appropriate size;

[0031] Step 2: Feed the strip-shaped stiffening rib into the hydraulic corrugating machine, and continuously press it through the mold to form trapezoidal corrugations, thus obtaining the trapezoidal corrugated stiffening rib;

[0032] Step 3: Segmentally hoist the trapezoidal corrugated stiffening ribs into the tower body 1, aligning them with the spiral baseline of the laser projection. Then adjust the position of the trapezoidal corrugated stiffening ribs to ensure that the crest direction of the trapezoidal corrugations is perpendicular to the axis of the tower body 1;

[0033] Step 4: Weld one end of the trapezoidal corrugated stiffening rib plate to the upper flange plate 2. Adjust the deflection angle of the trapezoidal corrugated stiffening rib plate according to the spiral angle of the spiral stiffening rib 4 to be made. Then install magnetic clamps every 1m along the length of the trapezoidal corrugated stiffening rib plate, apply pressure, and perform temporary spot welding at both ends and the middle of the trapezoidal corrugated stiffening rib plate.

[0034] Step 5: Along the spiral direction, use a welding torch to weld the trapezoidal corrugated stiffening ribs onto the inner wall of the tower body 1, thereby creating a tower structure with spiral stiffening ribs 4.

[0035] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A high-strength stainless steel-high-strength steel composite tower structure for offshore wind power, characterized in that: The tower body (1), upper flange plate (2), lower flange plate (3) and spiral stiffening rib (4) are included. The tower body (1) is a frustum-shaped cylinder. The upper flange plate (2) is provided at the top inside the tower body (1), and the lower flange plate (3) is provided at the bottom inside the tower body (1). The spiral stiffening rib (4) is provided inside the tower body (1), and the top end of the spiral stiffening rib (4) is connected to the upper flange plate (2), and the bottom end of the spiral stiffening rib (4) is connected to the lower flange plate (3). There are two or more welding points evenly provided on the spiral stiffening rib (4), and the spiral stiffening rib (4) is welded and fixed to the cylinder wall of the tower body (1) through the welding points. The thickness of the spiral stiffening rib (4) is 0.3 to 0.5 times the thickness of the tower body (1); The width of the spiral stiffening rib (4) is 1 / 16 to 1 / 13 of the average diameter of the tower body (1); The tower body (1) includes an outer high-strength stainless steel cylinder (11) and an inner high-strength steel cylinder (12), and the wall thickness of the inner high-strength steel cylinder (12) is not less than the wall thickness of the outer high-strength stainless steel cylinder (11).

2. The high-strength stainless steel-high-strength steel composite tower structure for offshore wind power according to claim 1, characterized in that: The spiral stiffening rib (4) is a trapezoidal corrugated plate.

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