An assembled split-cavity steel-concrete wind turbine tower barrel and manufacturing method thereof

Abstract

The present invention discloses a prefabricated assembled steel-concrete wind turbine tower barrel and a manufacturing method thereof, belonging to the field of wind turbine tower barrels. The prefabricated assembled steel-concrete wind turbine tower barrel of the present invention includes an assembled steel-concrete combined structure barrel body. The assembled steel-concrete combined structure barrel body is composed of more than 4 sub-units in the circumferential direction. The circumferentially adjacent sub-units are connected and fastened through circumferential nodes; the assembled steel-concrete combined structure barrel body is assembled in sections along the height direction, and the vertically adjacent sections are connected and fastened through vertical nodes. The tower barrel structure is reasonably designed, and under similar civil engineering quantities, the present invention has better structural stress performance. All components of the present invention are prefabricated in the factory, the on-site connection construction is convenient, and the installation efficiency is high. On the premise of meeting the requirements of wind turbine generators, the present invention can save project costs.

Description

Technical Field

[0001] The invention belongs to the field of wind turbine towers, and in particular to an assembled split-cavity steel-concrete wind turbine tower and a manufacturing method thereof. Background Art

[0002] In recent years, wind power generation has witnessed a new wave of installation. The focus of wind power development has started to shift to low-wind-speed areas, and the development space height of wind power resources has been gradually increasing, resulting in an increase in the height of wind turbine towers. On the other hand, the process of large-scale wind power equipment is also accelerating. Large-sized wind turbine blades can increase the single-unit capacity of wind power generation, showing obvious economic advantages. These factors have led to an increase in the load borne by the tower structure of wind turbines, and thus the size and cost of the tower have also increased accordingly. In addition, due to the harsh operating environment of wind turbines themselves and the complex stress of the tower structure, strict requirements are imposed on the strength, stability, deformation, fatigue resistance and other properties of large-scale wind turbine towers, resulting in a series of problems such as the manufacturing, transportation, installation and cost of wind turbine towers.

[0003] Currently, most of the under-construction wind turbine towers adopt pure steel structures. Although the installation is fast, with the increase in the diameter and height of the wind turbine towers, the cross-sectional size and wall thickness of the steel towers will increase significantly, leading to a large increase in construction costs. The steel-reinforced concrete hybrid structure is another type of wind turbine tower structure, but due to the complex processing and assembly process and high cost, it is not well applicable to large-scale wind turbine towers. Summary of the Invention

[0004] The purpose of the invention is to overcome the above-mentioned shortcomings of the prior art and provide an assembled split-cavity steel-concrete wind turbine tower and a manufacturing method thereof.

[0005] To achieve the above purpose, the invention adopts the following technical solutions:

[0006] An assembled split-cavity steel-concrete wind turbine tower includes a split-cavity steel-concrete composite structure barrel body. The split-cavity steel-concrete composite structure barrel body is composed of more than 4 sub-units in the circumferential direction, and adjacent sub-units are connected and fastened through circumferential nodes;

[0007] The split-cavity steel-concrete composite structure barrel body is assembled in sections along the height direction, and adjacent sections in the vertical direction are connected and fastened through vertical nodes;

[0008] The sub-unit is welded by a plurality of first steel cavities and a plurality of second steel cavities. The second steel cavity is welded at the connection of adjacent first steel cavities, and concrete is poured inside both the first steel cavity and the second steel cavity;

[0009] The first steel cavity is a U-shaped steel;

[0010] The second steel cavity is a trapezoidal steel pipe.

[0011] Furthermore, the vertical segmentation height of the barrel body of the combined steel-concrete structure with interlocking cavities is 8 - 12 m.

[0012] Furthermore, circumferential connecting steel cavities are provided at the circumferential joints of the first steel cavity. A circumferential connecting plate is provided outside the circumferential connecting steel cavity at the joint, and circumferential connecting bolts for fastening are provided on the circumferential connecting plate.

[0013] Furthermore, vertical connecting end strengthening members are provided at the joints of the first steel cavity in the height direction. A vertical connecting plate is provided outside the vertical connecting end strengthening member at the joint, and vertical connecting bolts for fastening are provided on the vertical connecting plate.

[0014] Furthermore, the inner wall of the cross-section of the barrel body of the combined steel-concrete structure with interlocking cavities is octagonal, hexagonal or quadrilateral.

[0015] Furthermore, the concrete is lightweight aggregate concrete.

[0016] Furthermore, grouting material is poured at the circumferential joints.

[0017] Furthermore, the inner diameter and outer diameter of the barrel body of the combined steel-concrete structure with interlocking cavities continuously shrink as the height increases.

[0018] A manufacturing method for an assembled combined steel-concrete wind turbine tower barrel includes:

[0019] Using U-shaped steel as the first steel cavity and trapezoidal steel pipe as the second steel cavity;

[0020] Pouring concrete into the first steel cavity and the second steel cavity;

[0021] Welding a number of the first steel cavities and a number of the second steel cavities according to a preset shape to obtain sub-units;

[0022] On-site, tightly connecting the circumferences of the sub-units by circumferential joints to obtain a section of the barrel body of the combined steel-concrete structure with interlocking cavities;

[0023] Repeating the above operation of tightly connecting the sub-units to obtain a number of sections of the barrel body of the combined steel-concrete structure with interlocking cavities;

[0024] Tightly connecting the sections of the barrel body of the combined steel-concrete structure with interlocking cavities in the height direction through vertical joints, and after completion, obtaining the assembled combined steel-concrete wind turbine tower barrel.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The fabricated assembled steel-concrete wind turbine tower of the present invention has a main structure composed of hollow steel and concrete, making full use of the high tensile performance of the steel structure and the high compressive performance of the concrete. On the one hand, the steel provides effective restraint to the concrete, avoiding the brittle failure of the core concrete under triaxial pressure. On the other hand, the concrete provides effective support to the steel, enhancing the stability of the steel. The wind turbine tower structure of the present invention is reasonably designed. Under similar civil engineering quantities, the present invention has high bearing capacity, fatigue resistance and impact resistance. All components of the present invention are prefabricated in the factory, and the on-site connection construction is convenient and the installation efficiency is high. On the premise of meeting the requirements of the wind power generation unit, the project cost is also saved.

[0027] Furthermore, lightweight concrete is adopted to reduce the weight of the components and save the transportation and hoisting costs.

[0028] Furthermore, the cross-section of the present invention is a hollow octagon, hexagon or quadrilateral to meet different tower section sizes, tower heights, transportation conditions and lifting weights.

[0029] The manufacturing method of the fabricated assembled steel-concrete wind turbine tower of the present invention has simple assembly steps and can be widely promoted and applied. Description of the Drawings

[0030] Figure 1 Overall schematic diagram of the present invention;

[0031] Figure 2 Cross-sectional view of the present invention;

[0032] Figure 3 Schematic diagram of the circumferential node of the present invention;

[0033] Figure 4 Schematic diagram of the vertical node of the present invention.

[0034] Among them, 1 - assembled steel-concrete composite structure barrel body; 2 - first steel cavity; 3 - vertical connection end strengthening member; 4 - second steel cavity; 5 - circumferential connection steel cavity; 6 - circumferential node; 7 - vertical node; 8 - circumferential connecting plate; 9 - circumferential connection bolt; 10 - vertical connecting plate; 11 - vertical connection bolt; 12 - concrete. Detailed Embodiments

[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0037] The present invention will be further described in detail below with reference to the accompanying drawings:

[0038] An assembled split-cavity steel-concrete wind turbine tower barrel includes a split-cavity steel-concrete composite structure barrel body 1, a first steel cavity 2, a vertical connection end strengthening member 3, a second steel cavity 4, a circumferential connection steel cavity 5, a circumferential node 6, a vertical node 7, a circumferential connection plate 8, a circumferential connection bolt 9, a vertical connection plate 10, a vertical connection bolt 11 and concrete 12.

[0039] See Figure 1 , Figure 1 , which is the overall structure diagram of the present invention. The assembled split-cavity steel-concrete wind turbine tower barrel of the present invention includes a split-cavity steel-concrete composite structure barrel body 1. The split-cavity steel-concrete composite structure barrel body is divided into 4 sub-units along the circumferential direction and is connected and fastened by a circumferential node 6; the split-cavity steel-concrete composite structure barrel body 1 is assembled in sections along the height direction, and adjacent vertical sections are connected and fastened by a vertical node 7. The vertical section height of the split-cavity steel-concrete composite structure barrel body 1 is 8 - 12 m. The inner diameter and outer diameter of the wind turbine tower barrel of the present invention continuously shrink as the height increases.

[0040] See Figure 2 , Figure 2 , which is the cross-sectional view of the present invention. It can be seen that the cross-section of the wind turbine tower barrel of the present invention is generally a hollow polygonal ring as a whole. Among them, the present invention is composed of 4 sub-units, and the 4 sub-units are connected and fastened by a circumferential node 6.

[0041] See Figure 3 , Figure 3 , which is the assembly drawing of the circumferential node of the present invention. It can be seen that at the connection of each sub-unit, a circumferential connection steel cavity 5 is provided at the connection of the first steel cavity 2. A circumferential connection plate 8 is provided on the circumferential connection steel cavity 5 at the connection, and a circumferential connection bolt 9 for fastening is provided on the circumferential connection plate 8.

[0042] SeeFigure 4 , Figure 4 This is the assembly drawing of the vertical joint of the present invention. It can be seen that vertical connection end strengthening members 3 are provided at the joints of the first steel cavities 2 in the height direction. A vertical connection plate 10 is provided outside the vertical connection end strengthening members 3 at the joints, and vertical connection bolts 11 for fastening are provided on the vertical connection plate 10.

[0043] An assembled cavity - steel - concrete composite structural unit is welded in the factory from a first steel - concrete composite structural subunit, a second steel - concrete composite structural subunit, and circumferential connection steel cavities. The second steel - concrete composite structural subunit is arranged at the external corner of the unit cross - section. Circumferential connection steel cavities are arranged at the circumferential ends of each cavity - steel - concrete composite structural unit. The first steel - concrete composite structural subunit is composed of a first steel cavity and concrete. The first steel cavity is a U - shaped steel formed by cold bending in the factory. Vertical connection end strengthening members are provided axially in the first steel cavity. The side limbs between the steel cavities are welded into a whole in the factory, and concrete is poured inside the cavities. The second steel - concrete composite structural subunit is composed of a second steel cavity and concrete. The second steel cavity is a trapezoidal steel pipe welded in the factory, and concrete is poured inside the cavity.

[0044] A manufacturing method of an assembled cavity - steel - concrete wind turbine tower barrel includes:

[0045] Taking the U - shaped steel as the first steel cavity 2 and the trapezoidal steel pipe as the second steel cavity 4;

[0046] Pouring concrete 12 into the first steel cavity 2 and the second steel cavity 4;

[0047] Welding a plurality of first steel cavities 2 and a plurality of second steel cavities 4 according to a preset shape to obtain a subunit;

[0048] Fastening the circumferential direction of the subunits by circumferential joints 6 on - site to obtain a section of cavity - steel - concrete composite structural barrel body 1;

[0049] Repeating the above operation of fastening the subunits to obtain a plurality of sections of cavity - steel - concrete composite structural barrel bodies 1;

[0050] Fastening each section of the cavity - steel - concrete composite structural barrel body 1 in the height direction by vertical joints 7, and after completion, obtaining an assembled cavity - steel - concrete wind turbine tower barrel.

[0051] The above content is only to illustrate the technical idea of the present invention and cannot limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A manufacturing method of an assembled cavity steel-concrete wind turbine tower barrel, characterized in that, The wind turbine tower barrel includes a combined steel-concrete structure barrel body (1) with a spliced cavity. The combined steel-concrete structure barrel body (1) is composed of more than 4 sub-units in the circumferential direction, and adjacent sub-units are tightly connected by circumferential nodes (6). The combined steel-concrete structure barrel body (1) is assembled in sections along the height direction, and adjacent sections in the vertical direction are tightly connected by vertical nodes (7). The sub-unit is welded by a number of first steel cavities (2) and a number of second steel cavities (4). The second steel cavity (4) is located at the outer corner of the cross-section of the sub-unit and is welded at the connection of adjacent first steel cavities (2). Concrete (12) is poured inside both the first steel cavity (2) and the second steel cavity (4). The first steel cavity (2) is a U-shaped steel. The second steel cavity (4) is a trapezoidal steel pipe. At the connection of each sub-unit, a circumferential connecting steel cavity (5) is provided at the connection of the first steel cavities (2). A circumferential connecting steel plate (8) is provided on the circumferential connecting steel cavity (5) at the connection, and a circumferential connecting bolt (9) for fastening is provided on the circumferential connecting steel plate (8). At the connection of the first steel cavities (2) in the height direction, a vertical connecting end strengthening member (3) is provided. A vertical connecting steel plate (10) is provided outside the vertical connecting end strengthening member (3) at the connection, and a vertical connecting bolt (11) for fastening is provided on the vertical connecting steel plate (10). The inner wall of the cross-section of the combined steel-concrete structure barrel body (1) is octagonal. The inner diameter and outer diameter of the combined steel-concrete structure barrel body (1) become smaller as the height increases. Grouting material is poured at the circumferential node (6). The manufacturing method includes: Using U-shaped steel as the first steel cavity (2) and trapezoidal steel pipe as the second steel cavity (4). Pouring concrete (12) into the first steel cavity (2) and the second steel cavity (4). Welding a number of first steel cavities (2) and a number of second steel cavities (4) according to a preset shape to obtain a sub-unit. On-site, tightly connect the sub-units in the circumferential direction by circumferential nodes (6) to obtain a section of the combined steel-concrete structure barrel body (1). Repeat the above operation of fastening the sub-units to obtain a number of sections of the combined steel-concrete structure barrel body (1). In the height direction, tightly connect each section of the combined steel-concrete structure barrel body (1) by vertical nodes (7). After completion, an assembled wind turbine tower barrel of combined steel-concrete with a spliced cavity is obtained.

2. The manufacturing method of the assembled split cavity steel-concrete wind turbine tower according to claim 1, characterized in that, The vertical sectional height of the combined steel-concrete structure barrel body (1) is 8 - 12 m.

3. The manufacturing method of the assembled split cavity steel-concrete wind turbine tower barrel according to claim 1, characterized in that, The concrete (12) is lightweight aggregate concrete.

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