Steel tower transition section of concrete fan tower

Abstract

The utility model provides a steel tower transition section of a concrete fan tower, which comprises a barrel, an upper flange matched with the bottom of a steel tower section is arranged at the upper end of the barrel, a lower flange matched with the top of a concrete tower is arranged at the lower end of the barrel, a plurality of bolt holes are uniformly formed in the upper flange along the circumferential direction, and the positions of the bolt holes correspond to the positions of bolts at the bottom of the steel tower section. A plurality of prestressed pipeline holes are evenly formed in the lower flange in the annular direction, the positions of the prestressed pipeline holes correspond to the positions of prestressed pipelines on the top of the concrete tower drum, steel strands penetrate through the prestressed pipelines and the prestressed pipeline holes, a plurality of anchor bolt holes are further evenly formed in the lower flange in the annular direction, and the positions of the anchor bolt holes correspond to the positions of anchor bolts on the top of the concrete tower drum. According to the steel tower transition section of the concrete fan tower, the transition section and the concrete tower drum are connected through the external prestress steel strands and the anchor bolts, the overall safety coefficient and reliability of the tower drum are greatly improved, overall stress distribution is uniform, and local cracking of the concrete tower is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of high towers of onshore wind turbine generator sets, in particular to a steel tower transition section of a concrete wind turbine tower. Background Art

[0002] At present, for areas with high wind shear, medium and large wind turbines on land are often equipped with higher hub heights to obtain better returns. However, factors such as long-distance transportation size, tower resonance, and later operation and maintenance costs have severely limited the application of traditional steel towers. With the development of wind power generation technology, steel-concrete towers have emerged. Prefabricated concrete towers are generally composed of a bottom foundation, a concrete tower, a steel tower connected to the main engine at the top, and a transition section between steel-concrete towers.

[0003] The concrete tower frame and the steel tower frame are generally connected through a transition section, and the transition section and the steel tower are generally connected by bolts. Due to the complex force at the connection between the transition section and the concrete tower, the traditional flange connection generally introduces prestress in the concrete tower and anchors the prestressed steel strands or prestressed anchor bolts on the flange of the transition section. Due to the limitation of the stiffness of the flange itself, when the spacing between the prestressing positions is large, the vertical stress distribution of the concrete at the bottom of the flange is uneven between the two adjacent prestressed holes arranged in the annular direction, and even tensile stress may occur, which may cause local cracking of the concrete at the top of the tower. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to overcome the disadvantages of the traditional flange connection method in the prior art that, due to the limitation of the stiffness of the flange itself, when the spacing between the prestressing positions is large, the vertical stress distribution of the concrete between two adjacent prestressing holes arranged in the annular direction in the concrete below the flange is uneven, and even tensile stress may occur, and there is a possibility of local cracking of the tower top concrete. The utility model provides a steel tower transition section of a concrete wind turbine tower.

[0005] The utility model solves the technical problem by adopting the following technical solution: a steel tower transition section of a concrete wind turbine tower, comprising a cylinder, wherein the upper end of the cylinder is provided with an upper flange matched with the bottom of the steel tower section, and the lower end is provided with a lower flange matched with the top of the concrete tower barrel, the upper flange is evenly provided with a plurality of bolt holes along the circumferential direction, and the positions of the bolt holes correspond to the bolt positions at the bottom of the steel tower section, the lower flange is evenly provided with a plurality of prestressed pipe holes along the circumferential direction, and the positions of the prestressed pipe holes correspond to the positions of the prestressed pipes of the concrete tower barrel, steel strands are passed through the prestressed pipes and the prestressed pipe holes, and the lower flange is also evenly provided with a plurality of anchor bolt holes along the circumferential direction, and the positions of the anchor bolt holes correspond to the anchor bolt positions at the top of the concrete tower barrel.

[0006] The cylinder body, upper flange, and lower flange are prefabricated by integral casting and welding, which is simple to manufacture and has precise geometric dimensions; it saves on-site working time, thereby enhancing the safety of the tower barrel during construction; the structural quality is stable and controllable, not fluctuating with the construction quality. Additionally, the contact surface between the lower flange of the transition section and the concrete tower barrel is the stress-bearing surface, and the force transmission path is simple and efficient. The product's prestress acts entirely on the lower flange, and the cylinder body only needs to resist the wind turbine load transmitted from the upper end, with high structural safety and reasonable design. The prestressed steel strands and anchor bolts cooperate with each other to jointly resist the pulling force, and the overall stress distribution is uniform, avoiding local cracking of the concrete tower.

[0007] Furthermore, the outer diameter of the upper end of the cylinder body is the same as that of the upper flange, and the outer diameter of the lower end of the cylinder body is the same as that of the lower flange. The transition between the steel tower transition section and the concrete tower is smooth, the force transmission path is simple and efficient, and the overall stress distribution is uniform.

[0008] Furthermore, a climbing ladder is provided inside the cylinder body, and a connecting bracket is provided between the climbing ladder and the upper flange.

[0009] Furthermore, a plurality of lightning protection studs are welded on the upper flange and the lower flange, and the lightning protection studs on the upper flange and the lower flange are in one-to-one correspondence in the vertical direction.

[0010] Furthermore, a layer of epoxy resin film is provided outside the steel strand. The film outside the steel strand has good anti-corrosion performance, a smooth and flat surface, and low frictional resistance, and is suitable for the circumferential arrangement of the assembled wind power hybrid tower. (Reference can be made to the patent application with the application number CN202410411725.3 regarding "Polyurethane-modified epoxy resin composition and steel strand suitable for circumferential arrangement of wind power hybrid tower".)

[0011] The beneficial effects of the present utility model are as follows: A steel tower transition section of a concrete wind turbine tower provided by the present utility model uses a combination of anchor bolts and external prestressed steel strands to connect the concrete tower at the bottom and the steel tower at the top of the precast concrete tower. The structure is simple, and it is easy to control the overall forming and welding accuracy of the components; the design customization degree is high, and it can meet the tower requirements of different models, hub heights, and upper and lower tower barrel diameters; the construction of the external prestressed steel strand tensioning and anchor bolt fixing processes is simple and fast, and the construction accuracy is controllable. Moreover, the former also has the advantages of no need for grouting and small prestress loss; finally, due to the use of two methods, external prestressed steel strands and anchor bolts, to connect the transition section and the concrete tower barrel, the present utility model can greatly improve the overall safety factor and reliability of the tower barrel, with uniform overall stress distribution and avoiding local cracking of the concrete tower. Description of the Drawings

[0012] The following further illustrates the present utility model in conjunction with the drawings and embodiments.

[0013] Figure 1This is a schematic structural diagram of the best embodiment of the present utility model.

[0014] In the figure: 1, cylinder body; 2, upper flange; 21, bolt holes; 3, lower flange; 31, prestressed duct holes; 32, anchor bolt holes; 4, climbing ladder; 5, lightning protection stud. Detailed implementation mode

[0015] Now, the present utility model will be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present utility model in a schematic way, so it only shows the components related to the present utility model.

[0016] As Figure 1 shown, a steel tower transition section of a concrete wind turbine tower of the present utility model includes a cylinder body 1. An upper flange 2 that cooperates with the bottom of the steel tower section is provided at the upper end of the cylinder body 1, and a lower flange 3 that cooperates with the top of the concrete tower barrel is provided at the lower end. Both the upper flange 2 and the lower flange 3 are integrally forged from Q355NE-Z35 material, the cylinder body 1 is made of Q355NE material, and the upper flange 2 and the lower flange 3 are fixed to the cylinder body 1 by submerged arc automatic welding. The cylinder body 1 is of a cylindrical or frustum-shaped structure. The outer diameter of the upper end of the cylinder body 1 is the same as the outer diameter of the upper flange 2, and the outer diameter of the lower end of the cylinder body 1 is the same as the outer diameter of the lower flange 3.

[0017] A plurality of bolt holes 21 are evenly arranged along the circumferential direction of the upper flange 2, and the positions of the bolt holes 21 correspond to the bolt positions at the bottom of the steel tower section, so as to facilitate the connection of the transition section and the steel tower section with bolts;

[0018] A plurality of prestressed duct holes 31 are evenly arranged along the circumferential direction of the lower flange 3, and the positions of the prestressed duct holes 31 correspond to the positions of the prestressed ducts of the concrete tower barrel, so that the longitudinal prestressed steel strands can pass through the prestressed duct holes 31 and the prestressed ducts for tensioning later, thereby fixing the transition section and the concrete tower barrel; A layer of epoxy resin film is provided outside the steel strands.

[0019] A plurality of anchor bolt holes 32 are also evenly arranged along the circumferential direction of the lower flange 3, and the positions of the anchor bolt holes 32 correspond to the anchor bolt positions at the top of the concrete tower barrel, so as to fix the transition section and the concrete tower barrel with anchor bolts later.

[0020] The inner diameter, outer diameter, opening diameter of the upper flange 2 and the lower flange 3, as well as the inner and outer diameters and height of the cylinder body 1, can be flexibly adjusted according to the requirements of the wind turbine generator for the tower.

[0021] A climbing ladder 4 is arranged inside the cylinder body 1, and a connecting bracket is provided between the climbing ladder 4 and the upper flange 2.

[0022] A plurality of lightning protection studs 5 are welded on the upper flange 2 and the lower flange 3, and the lightning protection studs 5 on the upper flange 2 and the lower flange 3 are in one-to-one correspondence in the vertical direction.

[0023] In the present utility model, directions and references (e.g., up, down, left, right, etc.) may be used only to assist in the description of features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the claimed subject matter is defined only by the appended claims and their equivalents.

[0024] Taking the above-mentioned ideal embodiments of the present utility model as inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the scope of the present utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A steel tower transition section of a concrete fan tower, characterized in that: The invention comprises a cylinder (1), wherein an upper flange (2) is provided at the upper end of the cylinder (1) and matches with the bottom of a steel tower section, and a lower flange (3) is provided at the lower end and matches with the top of a concrete tower tube. The upper flange (2) is evenly provided with a plurality of bolt holes (21) along the circumferential direction, and the positions of the bolt holes (21) correspond to the bolt positions at the bottom of the steel tower section. The lower flange (3) is evenly provided with a plurality of prestressed pipe holes (31) along the circumferential direction, and the positions of the prestressed pipe holes (31) correspond to the positions of the prestressed pipes of the concrete tower tube. Steel strands are inserted into the prestressed pipes and the prestressed pipe holes (31). The lower flange (3) is also evenly provided with a plurality of anchor bolt holes (32) along the circumferential direction, and the positions of the anchor bolt holes (32) correspond to the anchor bolt positions at the top of the concrete tower tube.

2. The steel tower transition section of a concrete fan tower as described in claim 1, characterized in that: The outer diameter of the upper end of the cylinder (1) is the same as the outer diameter of the upper flange (2), and the outer diameter of the lower end of the cylinder (1) is the same as the outer diameter of the lower flange (3).

3. The steel tower transition section of a concrete fan tower as claimed in claim 1, wherein: A climbing ladder (4) is arranged in the cylinder (1), and a connecting bracket is provided between the climbing ladder (4) and the upper flange (2).

4. The steel tower transition section of a concrete fan tower as claimed in claim 1, wherein: A plurality of lightning protection studs (5) are welded to the upper flange (2) and the lower flange (3), and the lightning protection studs (5) on the upper flange (2) and the lower flange (3) correspond one to one in the vertical direction.

5. The steel tower transition section of a concrete fan tower as claimed in claim 1, characterized in that: A layer of epoxy resin coating is arranged on the outer side of the steel strand.

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