Steel-concrete hybrid transition section tower drum

Abstract

The application provides a steel-concrete mixed transition section tower drum, which comprises a steel tower drum structure and a concrete tower drum structure, the steel tower drum structure and the concrete tower drum structure are staggered, and the steel tower drum structure and the concrete tower drum structure are connected through a connecting structure. The steel tower drum structure and the concrete tower drum structure are both cylindrical structures. The steel tower drum structure is a hollow double-layer structure, and the concrete tower drum structure is a structure with a solid middle part. The connecting structure comprises a steel pressure bearing plate, a shear plate, a concrete tower drum structure protruding part and a plurality of dowels. The application can avoid the problem of poor bonding performance of the original vertical bolt connection joint surface, enhance the integrity of the connecting section, increase the force transmission surface of the connecting section, improve the crack resistance of the concrete, and guarantee the durability requirement of the tower drum.

Description

Technical Field

[0001] This application belongs to the technical field of wind power equipment and relates to a steel-concrete hybrid transition section tower. Background Technology

[0002] As wind power transitions towards grid parity and turbines become larger, the demands on tower structures are increasing. The shortcomings of traditional pure steel towers, such as insufficient overall rigidity, are becoming increasingly apparent, leading to the development of ultra-high steel-concrete hybrid towers. These towers consist of an upper steel structure section, a lower prestressed reinforced concrete structure section, and a connecting structure. In low-wind-speed areas, ultra-high steel-concrete hybrid towers offer high cross-sectional rigidity, long service life, low manufacturing costs, and prefabrication capabilities, making their application an inevitable trend. However, the increase in wind turbine capacity and tower hub height also significantly increases the load on the tower itself, placing extremely high demands on its load-bearing capacity.

[0003] As a crucial transitional component connecting the upper steel tower section and the lower concrete tower section in a hybrid tower, the load-bearing capacity of the transition structure is vital to the safety and reliability of the entire tower. Currently, bolts are used to vertically connect the upper and lower sections at the transition points in hybrid towers. This type of transition structure has good force transmission capacity and is used in practical projects both domestically and internationally. However, with the increase in tower height and wind turbine power, the bonding performance of the bolted transition structure is poor during use, leading to opening and affecting durability, thus posing significant limitations. This limitation manifests in several ways. The steel-concrete interface exhibits material changes and abrupt shifts in cross-sectional stiffness, making it a weak point in the composite tower structure. Mechanically, the significant difference in elastic modulus between steel and concrete (steel being far superior) leads to uneven stress distribution at the interface under load. The concrete around the bolt holes is under complex stress, making it prone to localized crushing and cracking, reducing the connection's load-bearing capacity and affecting the overall structural integrity. Regarding overall deformation, the two materials have different deformation characteristics: steel has good ductility and elasticity, resulting in large and uniform deformation, while concrete exhibits significant elasto-plastic characteristics and weak deformation capacity. This leads to deformation inconsistencies at the interface, creating additional stress that may cause bolt loosening and concrete cracking. Furthermore, under long-term loads, poor bonding at the interface can easily cause structural loosening, resulting in uneven stress at the transition point and accelerated component wear. Opening also allows moisture and corrosive substances from the external environment to penetrate, further corroding the bolts and surrounding structure, affecting connection reliability and normal structural performance, significantly shortening the tower's service life, and increasing maintenance costs and safety hazards. Summary of the Invention

[0004] Based on the shortcomings of the existing technology, the purpose of this application is to provide a steel-concrete hybrid transition section tower, which can improve the overall stress performance and deformation coordination of the steel-concrete transition section.

[0005] The design scheme provided in this application is as follows:

[0006] One of the technical solutions of this application provides a steel-concrete hybrid transition section tower; the steel-concrete hybrid transition section tower includes a steel tower structure and a concrete tower structure, the steel tower structure and the concrete tower structure are arranged alternately, and the steel tower structure and the concrete tower structure are connected by a connecting structure.

[0007] Furthermore, the steel tower structure is a hollow, double-layered structure, with a central cavity formed by steel tubes on both the inner and outer sides. The outer steel tube has a thickness of 8–26 mm, and the inner steel tube has a thickness of 8–18 mm. Preferably, the outer steel tube has a thickness of 12 mm, and the inner steel tube has a thickness of 10 mm.

[0008] Furthermore, the concrete tower structure is a solid structure in the middle.

[0009] Furthermore, the concrete tower structure of the transition section tower is a monolithic cast-in-place unit.

[0010] Furthermore, the steel-concrete hybrid transition section tower has a gradually changing non-uniform cross-section structure. From the top to the bottom of the tower, its radial dimensions (such as diameter and side length) gradually increase along the height direction, forming a shape that is thinner at the top and thicker at the bottom. The bottom diameter, top diameter, height, and wall thickness of the steel-concrete hybrid transition section tower need to be designed according to the actual application requirements.

[0011] Furthermore, both the steel tower structure and the concrete tower structure are... The tower structure is defined by n, which takes any integer from 2 to 4. Therefore, steel tower structures and concrete tower structures can be arranged alternately to form a complete steel-concrete hybrid transition section tower, which is a complete ring structure.

[0012] Furthermore, the connecting structure includes a steel bearing plate, a shear plate, a protruding part of the concrete tower structure, and several studs; the connecting structure is used for lateral and / or vertical connection between the steel tower structure and the concrete tower structure; laterally, it connects adjacent steel tower structures and concrete tower structures on the left and right; vertically, it connects adjacent concrete tower structures and steel towers, or connects adjacent steel tower structures and concrete towers on the top and bottom. The protruding part of the concrete tower structure is integrally cast with the concrete tower structure; the steel bearing plate is set in the cavity in the middle of the steel tower structure and connected to the steel segments; several shear plates are set on the side of the steel bearing plate near the protruding part of the concrete tower structure, and the shear plates are inserted into the protruding part of the concrete tower structure, with the direction parallel to the steel segments; the studs pass through the shear plates and are inserted into the protruding part of the concrete tower structure to fix the shear plates to the protruding part of the concrete tower structure.

[0013] Furthermore, prestressed tendons are arranged circumferentially inside the concrete tower structure. The functions of the prestressed tendons are: to effectively suppress cracks caused by loads by applying tension in advance; to increase the stiffness and bending resistance of the concrete structure by stretching the reinforcing bars or wires to offset part of the tensile stress in the concrete under load, thereby improving the bending bearing capacity and overall stability of the structure; to reduce the size of concrete components while meeting the same bearing capacity, achieving the effect of saving materials and reducing the self-weight of the structure; and to reduce cracking of concrete caused by stress relaxation and environmental factors, extending the service life of the structure and reducing maintenance costs.

[0014] Furthermore, the material of the prestressed tendon is steel strand or a whole steel bar.

[0015] The second technical solution of this application provides a tower, wherein the upper layer of the tower is a steel tower and the lower layer is a concrete tower, and the transition section is a steel-concrete hybrid transition section tower provided in the first technical solution.

[0016] Furthermore, the steel tower structure of the transition section tower is connected to the upper steel tower through welding or other means, and the concrete tower structure of the transition section tower is vertically connected to the upper steel tower in the same way as the connecting structure; similarly, the steel tower structure of the transition section tower is vertically connected to the lower concrete tower in the same way as the connecting structure, and the concrete tower structure of the transition section tower is connected to the lower concrete tower through concrete connection, prestressed connection, or steel bar / steel plate connection or other means.

[0017] Furthermore, the height of the upper steel tower is 40-50m, the height of the lower concrete tower is 70-80m, and the height of the steel-concrete hybrid transition section tower is 1.5-2.0m; the bottom diameter of the steel tower is 3.0-4.0m, and the top diameter is 2.5-3.0m; the bottom diameter of the concrete tower is 6.0-7.0m, and the top diameter is 4.0-4.5m.

[0018] In one specific embodiment of this application, the upper layer of the tower is a steel cylinder with a height of 40m, the lower layer is a concrete tower with a height of 80m, and the middle layer is a steel-concrete hybrid transition section tower with a height of 1.5m. The bottom diameter of the concrete section is 6m and the top diameter is 4m, the bottom diameter of the steel section is 3.5m and the top diameter is 2.6m, the outer steel pipe thickness is 24mm, the inner steel pipe thickness is 16mm, the wall thickness of the cylinder changes uniformly along the height, and the cross-sectional shape of each section is a uniformly gradual change.

[0019] Compared with the prior art, this application has at least the following advantages:

[0020] (1) The axial force and bending moment of the connecting structure are transmitted by the steel bearing plate and stud connectors in the concrete protrusion, while the shear force and torque are transmitted by the steel bearing plate and shear plate on the diaphragm. Therefore, using this invention as the connecting section of the steel-concrete wind turbine tower can avoid the problem of poor connection performance of the original vertical bolted transition structure under long-term load, enhance the integrity of the connecting section, increase the force transmission surface of the connecting section, improve the crack resistance of the concrete, increase the service life of the tower, and ensure the durability performance requirements of the tower.

[0021] (2) In terms of mechanical properties, the axial force and bending moment of the connecting structure are transmitted by the steel bearing plate and stud connector in the concrete protrusion, and the shear force and torque are transmitted by the steel bearing plate and shear plate on the partition. This improves the problem of uneven stress distribution at the joint surface, reduces local crushing and cracking, improves the load-bearing capacity of the connecting section, and enhances the overall structure.

[0022] (3) In terms of overall deformation, after increasing the force transmission surface of the connecting section, the deformation of the joint section is more coordinated, avoiding excessive additional stress. Attached Figure Description

[0023] Figure 1 This is a layout diagram of the tower section in the steel-concrete hybrid transition zone;

[0024] Figure 2 Detailed structural diagram of the steel-concrete hybrid transition section tower.

[0025] Figure 3 This is a partial enlarged view of the detailed structure of the steel-concrete hybrid transition section tower.

[0026] Figure 4 This is a top view of the cross-section of the connection part;

[0027] Figure 5 This is a three-dimensional elevation view of the connecting part;

[0028] Figure 6 This is an elevation section view of the connection part;

[0029] Figure 7 This is a sectional elevation view of the vertical connection of the steel-concrete hybrid transition section tower.

[0030] Figure 8 This is an overall rendering of the tower where the steel-concrete hybrid transition section tower is located.

[0031] The markings in the diagram indicate:

[0032] 1. Steel tower structure; 1-1 Steel tubular segments;

[0033] 2. Concrete tower structure;

[0034] 3. Connecting structure; 3-1 Steel bearing plate; 3-2 Shear plate; 3-3 Concrete tower structure protrusion; 3-4 Studs; 4 Prestressed tendons. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to specific embodiments. It should be noted that the following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0036] All raw materials used in this invention are not particularly limited in their source; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0037] Example 1: A steel-concrete hybrid transition section tower

[0038] like Figures 1-7As shown, this embodiment provides a steel-concrete hybrid transition section tower, which is composed of four parts: two steel tower structures 1 and two concrete tower structures 2, which are interconnected in an alternating manner. Both the steel tower structures 1 and the concrete tower structures 2 are quarter-tower structures, forming a complete cylindrical structure, i.e., the transition section tower. The steel-concrete hybrid transition section tower has a gradually changing non-uniform cross-section structure; from the top to the bottom, its radial dimensions, including diameter and side length, gradually increase along the height, forming a shape that is thinner at the top and thicker at the bottom. A connecting structure 3 is provided at the contact points between the steel tower structures 1 and the concrete tower structures 2, ensuring a stable and secure connection between adjacent steel tower structures 1 and concrete tower structures 2, adapting to disturbances during use.

[0039] The steel tower structure 1 is a hollow, double-layered structure, with an inner and outer steel tube segment 1-1 forming a central cavity. The inner and outer steel tube segments 1-1 are concentric arcs with the same curvature. The outer steel tube segment is 12mm thick, and the inner steel tube segment is 10mm thick. The concrete tower structure 2 is a solid structure in the middle, constructed from cast concrete.

[0040] The connecting structure 3 includes a steel bearing plate 3-1, a shear plate 3-2, a concrete tower structure protrusion 3-3, and several studs 3-4. The concrete tower structure protrusion 3-3 is integrally cast with the concrete tower structure 2, and it extends into the cavity in the middle of the steel tower structure 1.

[0041] The steel bearing plate 3-1 is installed in the cavity in the middle of the steel tower structure 1 and is connected to the steel pipe segments 1-1 on both the inner and outer sides. Several shear plates 3-2 are installed on the side of the steel bearing plate 3-1 near the protruding part 3-3 of the concrete tower structure. The shear plates 3-2 are inserted into the protruding part 3-3 of the concrete tower structure, with their direction parallel to the tangent of the steel pipe segment 1-1 at that point. The studs 3-4 pass through the shear plates 3-2 and are inserted into the protruding part 3-3 of the concrete tower structure, fixing the shear plates 3-2 to the protruding part 3-3. The connection structure 3 described above has no gaps, meaning the connection is very strong.

[0042] In addition, prestressed tendons 4 (such as...) are arranged circumferentially inside the concrete tower structure 2 and the protruding part 3-3 of the concrete tower structure. Figure 6 , Figure 8 (As shown). The prestressed tendon 4 is made of high-strength steel wire, steel strand, or a whole steel bar.

[0043] This embodiment provides a configuration of a steel-concrete hybrid transition section tower within the entire tower, as shown below. Figure 8As shown, the steel tower section of the transition section tower is connected to the upper steel tower by welding, and the concrete tower section of the transition section tower is vertically connected to the upper steel tower in the same way as the connecting structure 3; similarly, the steel tower section of the transition section tower is vertically connected to the lower concrete tower in the same way as the connecting structure 3, and the concrete tower section of the transition section tower is connected to the lower concrete tower by concrete connection.

[0044] The upper part of the tower is a 40m steel cylinder, and the lower part is an 80m concrete tower cylinder. In between the two is a 1.5m high steel-concrete hybrid transition section. The bottom diameter of the concrete cylinder section is 6m and the top diameter is 4m. The bottom diameter of the steel cylinder section is 3.5m and the top diameter is 2.6m. The wall thickness of the cylinder changes uniformly along the height, and the cross-sectional shape of each cylinder section is uniformly gradually changing.

[0045] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A steel-concrete hybrid transition section tower, characterized in that, The steel-concrete hybrid transition section tower includes a steel tower structure (1) and a concrete tower structure (2). The steel tower structure (1) and the concrete tower structure (2) are arranged alternately. The steel tower structure (1) and the concrete tower structure (2) are connected by a connecting structure (3); The connecting structure (3) includes a steel bearing plate (3-1), a shear plate (3-2), a concrete tower structure protrusion (3-3), and several studs (3-4); the connecting structure (3) is used for the lateral connection and / or vertical connection between the steel tower structure (1) and the concrete tower structure (2); the concrete tower structure protrusion (3-3) and the concrete tower structure (2) are integrally cast; the steel bearing plate (3-1) is set in the cavity in the middle of the steel tower structure (1), and... The steel pipe segments (1-1) are connected; several shear plates (3-2) are provided on the side of the steel bearing plate (3-1) near the protrusion (3-3) of the concrete tower structure. The shear plates (3-2) are inserted into the protrusion (3-3) of the concrete tower structure, and their direction is parallel to that of the steel pipe segments (1-1); the studs (3-4) pass through the shear plates (3-2) and are inserted into the protrusion (3-3) of the concrete tower structure to fix the shear plates (3-2) to the protrusion (3-3) of the concrete tower structure. Both the steel tower structure (1) and the concrete tower structure (2) are The tower structure, where n takes any integer from 2 to 4.

2. The steel-concrete hybrid transition section tower according to claim 1, characterized in that, The steel tower structure (1) is a hollow double-layer structure, with the cavity in the middle surrounded by steel tubes (1-1) on the inner and outer sides; wherein the thickness of the outer steel tube is 8~26 mm and the thickness of the inner steel tube is 8~18 mm.

3. A steel-concrete hybrid transition section tower according to claim 1, characterized in that, The concrete tower structure (2) is a solid structure in the middle, and is a whole cast in one piece.

4. A steel-concrete hybrid transition section tower according to claim 1, characterized in that, The steel-concrete hybrid transition section tower has a gradually changing non-uniform cross-section structure. From the top to the bottom of the tower, its radial dimension gradually increases along the height direction, forming a shape that is thinner at the top and thicker at the bottom.

5. A steel-concrete hybrid transition section tower according to claim 1, characterized in that, The concrete tower structure (2) has prestressed tendons (4) arranged circumferentially inside.

6. A steel-concrete hybrid transition section tower according to claim 5, characterized in that, The material of the prestressed strand (4) is steel strand or whole steel bar.

7. A tower, characterized in that, The upper layer of the tower is a steel tower, the lower layer is a concrete tower, and the transition section is a steel-concrete hybrid transition section tower as described in claim 1.

8. A tower according to claim 7, characterized in that, The steel tower section of the transition section tower is connected to the upper steel tower by welding, and the concrete tower section of the transition section tower is vertically connected to the upper steel tower in the same way as the connecting structure (3); the steel tower section of the transition section tower is vertically connected to the lower concrete tower in the same way as the connecting structure (3), and the concrete tower section of the transition section tower is connected to the lower concrete tower by concrete connection, prestressed connection or steel bar / steel plate connection.

9. A tower according to claim 7, characterized in that, The upper steel tower has a height of 40-50 m, the lower concrete tower has a height of 70-80 m, and the steel-concrete hybrid transition section tower has a height of 1.5-2.0 m. The bottom diameter of the steel tower is 3.0-4.0 m, and the top diameter is 2.5-3.0 m. The bottom diameter of the concrete tower is 6.0-7.0 m, and the top diameter is 4.0-4.5 m.

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