Steel-concrete mixed transition section tower drum

Abstract

The invention 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 arranged in a staggered mode, and the steel tower drum structure and the concrete tower drum structure are connected through a connecting structure. The steel tower tube structure and the concrete tower tube structure are both of # imgabs0 cylinder structures. The steel tower tube structure is of a hollow double-layer structure, and the concrete tower tube structure is of a structure with the solid middle. The connecting structure comprises a steel bearing plate, a shear plate, a concrete tower tube structure protruding part and a plurality of studs. The connecting section is adopted as the connecting section of the steel mixed wind tower, the problem that an original vertical bolt connection combination surface is poor in bonding performance can be avoided, the integrity of the connecting section is enhanced, the force transmission surface of the connecting section is increased, the crack resistance of concrete is improved, and the requirement for the durability of a tower drum is met.

Description

Technical Field

[0001] The present application belongs to the technical field of wind energy prime mover equipment and relates to a steel-concrete hybrid transition section tower. Background Art

[0002] As wind power moves towards parity under energy transformation, the large-scale units have higher requirements for towers, and the disadvantages of traditional pure steel towers, such as insufficient overall rigidity, have gradually become apparent, prompting the emergence of ultra-high steel-concrete hybrid towers. This tower consists of an upper steel structure tower section, a lower prestressed reinforced concrete structure tower section, and a transition structure connecting the two. In low wind speed areas, ultra-high steel-concrete hybrid towers have high cross-sectional rigidity, long service life, low manufacturing cost and can be prefabricated, and their application has become a general trend. However, the increase in wind turbine capacity and tower hub height will also greatly increase the load borne by the tower itself. This places extremely high demands on the tower's bearing capacity.

[0003] As an important transitional component connecting the upper steel tower section and the lower concrete tower section in a hybrid tower, the transfer structure's own bearing performance is crucial to the safety and reliability of the entire tower. At present, bolts are used to vertically connect the upper and lower sections at the transfer point in the hybrid tower. This transfer structure has good force transmission capacity and has been used in actual projects at home and abroad. However, with the increase in tower height and the increase in wind turbine power, the bonding performance of the bolt transfer structure is poor during use, and the opening phenomenon occurs, which affects durability and has great limitations. This limitation is reflected in the fact that there are material changes and sudden changes in cross-sectional stiffness at the steel-concrete interface, which is the weakest part of the hybrid tower. In terms of mechanical properties, due to the large difference in elastic modulus between steel and concrete, the former is much higher than the latter. When subjected to stress, the stress distribution of the interface is uneven, and the concrete around the bolt hole is in a complex stress state, which is prone to local crushing, cracking and other damage, reducing the bearing capacity of the connection and affecting the integrity of the structure. In terms of overall deformation, the two have different deformation characteristics. Steel has good ductility and elasticity, large and uniform deformation, while concrete has obvious elastic-plastic characteristics and weak deformation capacity. Inconsistent deformation will occur at the interface, causing additional stress on the interface, which may lead to bolt loosening and concrete cracking. At the same time, under long-term load, due to poor bonding on the interface, the structure is prone to loosening, uneven stress at the transition point, and accelerated wear of components. The opening phenomenon will also allow water vapor and corrosive substances in the external environment to invade, further corrode the bolts and surrounding structures, affect the connection reliability and normal performance of the structure, greatly shorten the service life of the tower, and increase maintenance costs and safety hazards. Summary of the invention

[0004] Based on the above-mentioned shortcomings in the prior art, the purpose of the present application is to provide a steel-concrete hybrid transition section tower, which can improve the overall stress performance and deformation coordination ability of the steel-concrete transition section.

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

[0006] One of the technical solutions of the present 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-layer structure, with a cavity in the middle surrounded by steel pipe segments on both sides. The thickness of the outer steel pipe segment is 8 to 26 mm, and the thickness of the inner steel pipe segment is 8 to 18 mm. Preferably, the thickness of the outer steel pipe segment is 12 mm, and the thickness of the inner steel pipe segment is 10 mm.

[0008] Furthermore, the concrete tower structure is a structure with a solid center.

[0009] Furthermore, the concrete tower structure of the transition section tower is an integrally cast entity.

[0010] Furthermore, the steel-concrete hybrid transition section tower has a gradual non-uniform cross-section structure, and its radial dimensions (such as diameter, side length, etc.) gradually increase along the height direction from the top to the bottom of the tower, forming a thin top and thick bottom morphology. The bottom diameter, top diameter, height, and wall thickness of the steel-concrete hybrid transition section tower need to be designed according to the size required for actual application.

[0011] Furthermore, the steel tower structure and the concrete tower structure are The tower structure of n is any integer between 2 and 4. Therefore, the steel tower structure and the concrete tower structure can be arranged alternately to form a complete steel-concrete hybrid transition section tower, which is a complete annular structure.

[0012] Furthermore, the connection structure includes a steel pressure plate, a shear plate, a protrusion of a concrete tower structure and a plurality of bolts; the connection structure is used for the horizontal connection and / or vertical connection of a steel tower structure and a concrete tower structure; in the horizontal direction, it is used to connect the steel tower structure and the concrete tower structure adjacent to each other on the left and right; in the vertical direction, it is used to connect the concrete tower structure and the steel tower adjacent to each other on the upper and lower sides, or to connect the steel tower structure and the concrete tower adjacent to each other on the upper and lower sides. The protrusion of the concrete tower structure and the concrete tower structure are an integrally cast structure; the steel pressure plate is arranged in the cavity in the middle of the steel tower structure and is connected to the steel pipe segment; a plurality of shear plates are arranged on one side of the steel pressure plate close to the protrusion of the concrete tower structure, and the shear plates are inserted in the protrusion of the concrete tower structure in a direction parallel to the steel pipe segment; the bolts pass through the shear plate and are inserted into the protrusion of the concrete tower structure to fix the shear plate to the protrusion of the concrete tower structure.

[0013] Furthermore, prestressed beams are arranged in the circumferential direction inside the concrete tower structure. The functions of the prestressed beams are: pre-applied tension effectively suppresses cracks caused by loads; increases the rigidity and bending resistance of the concrete structure, and offsets part of the tensile stress of the concrete when loaded by stretching the steel bars or steel wires, thereby improving the bending bearing capacity and overall stability of the structure; reduces the size of the concrete components while meeting the same bearing capacity, thereby saving materials and reducing the deadweight of the structure; reduces cracking of concrete caused by stress relaxation and environmental factors, prolongs the service life of the structure, and reduces maintenance costs.

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

[0015] The second technical solution of the present application provides a tower, wherein 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 mixed transition section tower provided by the technical solution one.

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

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

[0018] In a specific embodiment of the present application, the upper layer of the tower is a 40m high steel cylinder, the lower layer is an 80m high concrete tower, and in the middle is a 1.5m high steel-concrete mixed transition section tower. The bottom diameter of the concrete cylinder section is 6m, the top diameter is 4m, the bottom diameter of the steel cylinder section is 3.5m, the top diameter is 2.6m, the outer steel pipe thickness is 24mm, the inner steel pipe thickness is 16mm, the cylinder wall thickness changes uniformly along the height, and the cross-sectional form of each cylinder section is a uniform gradient form.

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

[0020] (1) The axial force and bending moment of the connection structure are transmitted by the steel pressure plate and the bolt connector in the concrete protrusion, and the shear force and torque are transmitted by the steel pressure plate and the shear plate on the partition. Therefore, the use of the present invention as the connection section of the steel-concrete wind turbine tower can avoid the problem of poor connection performance of the original vertical bolt transfer structure under long-term load, enhance the integrity of the connection section, increase the force transmission surface of the connection section, improve the crack resistance of 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 connection structure are transmitted by the steel bearing plate and the bolt connector in the concrete protrusion, and the shear force and torque are transmitted by the steel bearing plate and the shear plate on the partition. This improves the problem of uneven stress distribution at the joint surface, reduces local crushing and cracking, improves the bearing capacity of the connection section, and enhances the integrity of the structure.

[0022] (3) In terms of overall deformation, after increasing the force transmission surface of the connecting section, the deformation of the connecting section is more coordinated, avoiding the generation of excessive additional stress. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 Schematic diagram of the detailed structure 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 is a top view of the cross section of the connection portion;

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

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

[0029] Figure 7 It is the elevation section view of the vertical connection of the steel-concrete hybrid transition section tower;

[0030] Figure 8 This is the overall effect diagram of the tower where the steel-concrete mixed transition section tower is located;

[0031] The marks in the figure indicate:

[0032] 1 steel tower structure; 1-1 steel pipe segment;

[0033] 2Concrete tower structure;

[0034] 3 connection structure, 3-1 steel pressure plate, 3-2 shear plate, 3-3 concrete tower structure protrusion, 3-4 stud; 4 prestressed tendon. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with 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 form. It should be noted that for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0036] All raw materials of the present invention have no particular limitation on their sources, and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

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

[0038] like Figures 1 to 7As shown, this embodiment provides a steel-concrete hybrid transition section tower, which is composed of four parts, including two steel tower structures 1 and two concrete tower structures 2, which are staggered and connected. The steel tower structure 1 and the concrete tower structure 2 are both 1 / 4 tower structures, which can form a complete cylindrical structure, namely the transition section tower. The steel-concrete hybrid transition section tower is a gradual non-uniform cross-section structure. From the top of the tower to the bottom, its radial dimensions including diameter, side length, etc. gradually increase along the height direction, forming a thin top and thick bottom morphology. A connection structure 3 is provided at the contact portion of the steel tower structure 1 and the concrete tower structure 2, so that the adjacent steel tower structures 1 and concrete tower structures 2 are stably and firmly connected together to adapt to disturbances during use.

[0039] The steel tower structure 1 is a hollow double-layer structure, with a cavity in the middle surrounded by steel pipe segments 1-1 on both sides. The steel pipe segments 1-1 on both sides are concentric arcs with the same curvature. The thickness of the outer steel pipe segment is 12mm, and the thickness of the inner steel pipe segment is 10mm. The concrete tower structure 2 is a solid structure in the middle, which is cast by concrete.

[0040] The connection structure 3 includes a steel pressure plate 3-1, a shear plate 3-2, a concrete tower structure protrusion 3-3 and a plurality of bolts 3-4. The concrete tower structure protrusion 3-3 is an integrally cast structure with the concrete tower structure 2, and extends into the cavity in the middle of the steel tower structure 1.

[0041] The steel pressure plate 3-1 is arranged 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; the steel pressure plate 3-1 is provided with a plurality of shear plates 3-2 on one side close to the protruding portion 3-3 of the concrete tower structure, and the shear plates 3-2 are inserted into the protruding portion 3-3 of the concrete tower structure, and the direction is parallel to the tangent of the steel pipe segment 1-1 at that location; the bolts 3-4 pass through the shear plates 3-2 and are inserted into the protruding portion 3-3 of the concrete tower structure, fixing the shear plates 3-2 and the protruding portion 3-3 of the concrete tower structure. The connection structure 3 described above does not contain any gaps, that is, the connection is very firm.

[0042] In addition, the concrete tower structure 2 and the concrete tower structure protrusion 3-3 are provided with prestressed beams 4 (such as Figure 6 , Figure 8 The material of the prestressed bundle 4 is high-strength steel wire, steel strand or a whole steel bar.

[0043] The present embodiment provides a steel-concrete mixed transition section tower provided in the entire tower. 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 manner 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 manner as the connecting structure 3, and the concrete tower section of the transition section tower is connected to the lower concrete tower by a concrete connection.

[0044] The upper part of the tower is a 40m steel cylinder, the lower part is an 80m concrete tower, and in the middle is a 1.5m high steel-concrete mixed transition section tower. 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 evenly along the height, and the cross-section of each cylinder section is a uniform gradient form.

[0045] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and 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 present invention should be within the scope of protection of the present invention.

Claims

1. A steel-concrete mixed transition section tower, characterized in that: The steel-concrete hybrid transition section tower comprises 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 via a connection structure (3).

2. A 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 a central cavity surrounded by steel pipe segments (1-1) on both sides; wherein the thickness of the outer steel pipe segment is 8 to 26 mm, and the thickness of the inner steel pipe segment is 8 to 18 mm.

3. The steel-concrete hybrid transition section tower according to claim 1, characterized in that: The concrete tower structure (2) is a structure with a solid center, and is an integrally cast whole.

4. The steel-concrete hybrid transition section tower according to claim 1, characterized in that: The steel-concrete mixed transition section tower has a gradual non-uniform cross-section structure, and its radial dimension gradually increases along the height direction from the top to the bottom of the tower, forming a thin top and thick bottom structure; the steel tower structure (1) and the concrete tower structure (2) are both The tower structure is as follows: n is any integer between 2 and 4.

5. The steel-concrete hybrid transition section tower according to claim 1, characterized in that: The connection structure (3) comprises a steel pressure-bearing plate (3-1), a shear plate (3-2), a concrete tower structure protrusion (3-3) and a plurality of bolts (3-4); the connection structure (3) is used for horizontal connection and / or vertical connection of 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 and formed; The steel pressure-bearing plate (3-1) is arranged in the cavity in the middle of the steel tower structure (1) and is connected to the steel pipe segment (1-1); A plurality of shear plates (3-2) are arranged on one side of the steel pressure plate (3-1) close to the protruding portion (3-3) of the concrete tower structure, and the shear plates (3-2) are inserted into the protruding portion (3-3) of the concrete tower structure in a direction parallel to the steel pipe segment (1-1); The bolts (3-4) pass through the shear plate (3-2) and are inserted into the protruding portion (3-3) of the concrete tower structure, thereby fixing the shear plate (3-2) and the protruding portion (3-3) of the concrete tower structure.

6. The steel-concrete hybrid transition section tower according to claim 5, characterized in that: Prestressed tendons (4) are arranged in a circumferential direction inside the concrete tower structure (2).

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

8. 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 mixed transition section tower as described in claim 1.

9. A tower according to claim 8, 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 manner as the connection structure (3); the steel tower section of the transition section tower is vertically connected to the lower concrete tower in the same manner as the connection 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.

10. A tower according to claim 8, characterized in that: The height of the steel tower on the upper level of the tower is 40 to 50 meters, the height of the concrete tower on the lower level of the tower is 70 to 80 meters, and the height of the steel-concrete mixed transition section tower is 1.5 to 2.0 meters; the bottom diameter of the steel tower is 3.0 to 4.0 meters, and the top diameter is 2.5 to 3.0 meters; the bottom diameter of the concrete tower is 6.0 to 7.0 meters, and the top diameter is 4.0 to 4.5 meters.

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