Combined wind power generation tower and combination method

Abstract

The application discloses a combined wind power generation tower and a combination method, and relates to the field of structural engineering.The combined wind power generation tower comprises a single-pipe tower component, a lattice tower component and a conversion component.The single-pipe tower component comprises a first flange arranged at the bottom of the single-pipe tower component.The lattice tower component comprises inclined web members and tower columns, and a polygonal space truss is formed by the inclined web members and the tower columns.The conversion component comprises a connecting table arranged between the single-pipe tower component and the lattice tower component.The connecting table is connected with the single-pipe tower component and the lattice tower component through connecting pieces.The conversion component and the single-pipe tower component are hoisted to a designated position by hoisting equipment, and are installed respectively, that is, the steel connecting table is connected with the tower columns of the lattice tower component through second prestressed bolts, and the connecting table is connected with the connecting table through first prestressed bolts.The combined wind power generation tower has the advantages of low cost, convenient construction, large overall rigidity of the device, simple structure and reasonable force transmission.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology, and in particular to a combined wind power generation tower and its assembly method. Background Technology

[0002] my country possesses abundant wind energy resources, but the richest areas are mainly distributed in the "Three Norths" region (Northeast, North, and Northwest China), while electricity demand is concentrated in the low-wind-speed areas of central, eastern, and southern China. Therefore, in earlier years, this contradiction was primarily addressed by constructing ultra-high-voltage transmission lines. However, with a deeper understanding of the characteristics of wind resources in the low-wind-speed areas of central and eastern my country, and the rapid development of wind energy resource assessment technology, the potential for wind resource development and utilization has been continuously upgraded. Assessment results from the China Climate Center show that the technically exploitable onshore wind energy resources at a height of 100 meters are 8.694 billion kilowatts, and at a height of 140 meters, they are 10.179 billion kilowatts. For the low-wind-speed plains of Jiangsu, Anhui, Henan, Shandong, Hubei, and Hebei, where wind shear is relatively high, increasing tower height to lift the wind turbines to areas with higher wind speeds can capture more wind energy, increase turbine power generation, and effectively improve the economic benefits of wind farms. Therefore, high-support towers have become the preferred choice for wind turbines in high-wind-shear areas.

[0003] The single-tube-lattice combined wind turbine tower is a current solution for high-wind towers in low-wind-speed areas, combining the advantages of single-tube steel towers and lattice steel towers: the upper part of the tower, due to its smaller bending moment and higher installation and maintenance difficulty, can adopt a single-tube tower design, requiring fewer connections and simplifying maintenance; the lower part of the tower, with its larger bending moment, can be replaced with a lattice tower to improve material utilization efficiency and reduce steel consumption and foundation engineering, although this results in a large number of nodes. Compared to traditional single-tube towers, this solution offers better lateral stiffness, preventing resonance between the rotor and the supporting structure. However, the transition nodes between the single-tube and lattice tower sections have always been a design challenge. Currently, most existing tower types on the market use cast steel nodes or complex box-type nodes for transition connections, which are difficult to manufacture and very costly, limiting the application and development of single-tube-lattice combined wind turbine towers. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned combined wind power generation towers, the present invention is proposed.

[0005] Therefore, the problem to be solved by this invention is how to solve the current problems of complex connection nodes, high cost, and great construction difficulty in the current conversion section.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a combined wind power generation tower, comprising: a single-tube tower assembly, including a first flange disposed at the bottom of the single-tube tower assembly; a lattice tower assembly, including diagonal web members and tower columns, wherein the diagonal web members and tower columns form a polygonal space truss; and a conversion assembly, including a connecting platform disposed between the single-tube tower assembly and the lattice tower assembly, wherein the connecting platform is connected to the single-tube tower assembly and the lattice tower assembly via connectors.

[0007] As a preferred embodiment of the combined wind power generation tower of the present invention, a second flange is provided at the end of the tower column; the second flange is circumferentially distributed around the first flange.

[0008] As a preferred embodiment of the combined wind power generation tower of the present invention, a polygonal hole is provided at the center of the connecting platform, and the position of the polygonal hole corresponds to the position of the second flange.

[0009] As a preferred embodiment of the combined wind power generation tower of the present invention, the connecting platform includes several straight beams and several inclined beams, and a hidden column is provided inside the connecting platform corresponding to the tower column; the longitudinal steel bars of the straight beams are anchored into the hidden column, and the longitudinal steel bars of the inclined beams are anchored into the straight beams.

[0010] As a preferred embodiment of the combined wind power generation tower of the present invention, the connecting member includes a first prestressed bolt for connecting the single-tube tower assembly to the connecting platform; and a second prestressed bolt for connecting the tower column to the connecting platform.

[0011] As a preferred embodiment of the combined wind power generation tower of the present invention, the concrete within the range of the second prestressed bolt is under triaxial confining pressure.

[0012] As a preferred embodiment of the combined wind power generation tower of the present invention, sleeves are pre-embedded at the locations of the first prestressed bolt and the second prestressed bolt.

[0013] As a preferred embodiment of the combined wind power generation tower described in this invention, the first flange can be a T-type flange with two outer ring bolts, or an L-type flange with only inner or outer ring bolts.

[0014] Another objective of this invention is to provide a method for assembling a modular wind power tower, comprising: hoisting a connecting platform onto the top of the tower column; connecting a second prestressed bolt to the tower column; hoisting a single-tube tower assembly onto the connecting platform; and connecting a first prestressed bolt to the connecting platform.

[0015] In a preferred embodiment of the combination method described in this invention, the second prestressed bolt and the first prestressed bolt pass through the corresponding flanges and are respectively connected to the tower column and the connecting platform.

[0016] The beneficial effects of this invention are:

[0017] 1. It can be prefabricated in sections in the factory, transported, and then hoisted after wet connection and assembly on site. It can also be prefabricated directly on the construction site, which is cost-effective and convenient to construct.

[0018] 2. The device has high overall rigidity, simple structure, and reasonable force transmission;

[0019] 3. By optimizing the tower structure, wind turbines can be lifted to areas with higher wind speeds, thereby capturing more wind energy and improving power generation efficiency.

[0020] 4. The high rigidity and reasonable force transmission design of the reinforced concrete platform enhance the structural safety of the entire tower and reduce the risk of structural failure.

[0021] 5. Due to the durability and corrosion resistance of reinforced concrete, this transition joint can withstand harsh natural environments and long-term operational fatigue, extending the service life of the tower.

[0022] 6. The simplified node design and reduced connecting parts lower the complexity and cost of later maintenance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a scene illustration of a modular wind turbine tower.

[0025] Figure 2 This is a cross-sectional view of a combined wind turbine tower.

[0026] Figure 3 This is a diagram of the internal steel reinforcement structure of a combined wind turbine tower. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive, either alone or selectively, with other embodiments.

[0030] Example 1

[0031] Reference Figure 1 and Figure 2 This is the first embodiment of the present invention, which provides a combined wind power generation tower. The combined wind power generation tower includes a single-tube tower assembly 100, a lattice tower assembly 200, and a conversion assembly 300. The conversion assembly 300 connects the single-tube tower assembly 100 and the lattice tower assembly 200. In specific implementation, the overall shape of the combined wind power generation tower should be determined first through an overall analysis. During the overall analysis, the conversion assembly 300 can be assumed to be a rigid plate. When determining the shape, the top side width of the lattice tower assembly 200 is determined based on the bottom diameter of the single-tube tower assembly 100 and the construction method of the connecting platform 301, so that there is sufficient construction space between the second flange at the top of the tower column 202 and the first flange 101 at the bottom of the single-tube tower assembly 100.

[0032] Specifically, the single-tube tower assembly 100 includes a first flange 101 disposed at the bottom of the single-tube tower assembly 100.

[0033] Preferably, the lattice tower assembly 200 includes diagonal web members 201 and tower columns 202, which together form a polygonal space truss.

[0034] Preferably, the conversion component 300 includes a connecting platform 301 disposed between the single-tube tower component 100 and the lattice tower component 200, and the connecting platform 301 is connected to the single-tube tower component 100 and the lattice tower component 200 via a connector 302.

[0035] In use, the conversion component 300 and the single-tube tower component 100 are hoisted to the designated position by hoisting equipment and installed separately. Specifically, the steel connecting platform 301 is connected to the tower column 202 of the lattice tower component 200 by the second prestressed bolt 302b, and the connecting platform 301 is connected by the first prestressed bolt 302a.

[0036] Example 2

[0037] Reference Figures 2-3 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0038] Specifically, a second flange 202a is provided at the end of the tower column 202;

[0039] The second flange 202a is distributed in a ring around the first flange 101. The second flange 202a on the tower column 202 of the lattice tower assembly 200 should be as close as possible to the first flange 101 to make the force transmission path as simple as possible and avoid sudden changes in stiffness.

[0040] Preferably, a polygonal hole 301a is provided at the center of the connecting platform 301, and the position of the polygonal hole 301a corresponds to the position of the second flange 202a. The thickness of the connecting platform 301 should be as small as possible, and the polygonal hole 301a should be as large as possible to reduce the weight of the platform.

[0041] Preferably, the connecting platform 301 includes several straight beams 301b and several inclined beams 301c, and the connecting platform 301 corresponding to the tower column 202 is provided with a hidden column 301d inside;

[0042] The longitudinal reinforcement of the straight beam 301b is anchored into the concealed column 301d, and the longitudinal reinforcement of the inclined beam 301c is anchored into the straight beam 301b.

[0043] Preferably, the connector 302 includes a first prestressed bolt 302a that connects the single-tube tower assembly 100 to the connecting platform 301;

[0044] It also includes a second prestressed bolt 302b that connects the tower column 202 to the connecting platform 301.

[0045] Preferably, the concrete within the range of the second prestressed bolt 302b is under triaxial confining pressure.

[0046] Preferably, sleeves are pre-embedded at the locations of the first prestressed bolt 302a and the second prestressed bolt 302b. In actual implementation, PVC sleeve reserved holes should be pre-embedded in the corresponding positions of the connecting platform 301 where the first prestressed bolt 302a and the second prestressed bolt 302b are located, and the accuracy of the reserved holes should be ensured by special tooling.

[0047] Preferably, the first flange 101 can be a T-type flange with two outer ring bolts, or an L-type flange with only inner or outer ring bolts.

[0048] In use, the connecting platform 301 can be prefabricated on-site, or it can be prefabricated in sections at the factory with pre-reserved reinforcing bars, depending on transportation conditions, and then assembled into a whole on-site by wet connection before hoisting. The modular wind turbine tower is not only suitable for connecting onshore modular towers, but also for connecting offshore single-tube towers and jacket foundations.

[0049] Example 3

[0050] Reference Figures 1-3 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0051] Specifically, the connecting platform 301 is hoisted onto the top of the tower column 202;

[0052] Connect the second prestressed bolt 302b to the tower column 202;

[0053] The single-tube tower assembly 100 is hoisted onto the connecting platform 301;

[0054] Connect the first prestressed bolt 302a to the connecting platform 301.

[0055] Preferably, the second prestressed bolt 302b and the first prestressed bolt 302a pass through the corresponding flanges and are connected to the tower column 202 and the connecting platform 301, respectively.

[0056] Preferably, the second prestressed bolt 302b and the first prestressed bolt 302a pass through the corresponding flanges and are connected to the tower column 202 and the connecting platform 301, respectively.

[0057] In use, after the lattice tower assembly 200 is installed, the connecting platform 301 is hoisted into place, and then the steel connecting platform 301 is connected to the tower column 202 of the lattice tower assembly 200 using the second prestressed bolt 302b. Afterwards, the single-tube tower assembly 100 is hoisted and connected to the connecting platform 301 using the first prestressed bolt 302a. This completes the construction of the entire conversion node.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A combined wind power generation tower, characterized in that: include, A single-tube tower assembly (100) includes a first flange (101) disposed at the bottom of the single-tube tower assembly (100); A lattice tower assembly (200) includes diagonal web members (201) and tower columns (202), which together form a polygonal space truss. The conversion assembly (300) includes a connecting platform (301) disposed between the single-tube tower assembly (100) and the lattice tower assembly (200), the connecting platform (301) being connected to the single-tube tower assembly (100) and the lattice tower assembly (200) via a connector (302); The tower column (202) is provided with a second flange (202a) at its end; The second flange (202a) is circumferentially distributed around the first flange (101); The connecting platform (301) has a polygonal hole (301a) at its center, and the position of the polygonal hole (301a) corresponds to the position of the second flange (202a). The connecting platform (301) includes several straight beams (301b) and several inclined beams (301c), and the tower column (202) has a hidden column (301d) inside the connecting platform (301). The longitudinal reinforcement of the straight beam (301b) is anchored into the hidden column (301d), and the longitudinal reinforcement of the inclined beam (301c) is anchored into the straight beam (301b). The connector (302) includes a first prestressed bolt (302a) that connects the monotube tower assembly (100) to the connecting platform (301). It also includes a second prestressed bolt (302b) for connecting the tower column (202) to the connecting platform (301); The concrete within the range of the second prestressed bolt (302b) is under triaxial confining pressure.

2. The combined wind power generation tower as described in claim 1, characterized in that: Sleeves are pre-embedded at the locations of the first prestressed bolt (302a) and the second prestressed bolt (302b).

3. The combined wind power generation tower as described in claim 2, characterized in that: The first flange (101) is a T-type flange with two outer ring bolts, or an L-type flange with only inner or outer ring bolts.

4. A combination method applied to a combined wind power generation tower as described in any one of claims 1 to 3, the method comprising: The connecting platform (301) is hoisted above the tower column (202); Connect the second prestressed bolt (302b) to the tower column (202); The single-tube tower assembly (100) is hoisted onto the connecting platform (301); The first prestressed bolt (302a) is connected to the connecting platform (301).

5. The combination method as described in claim 4, characterized in that: The second prestressed bolt (302b) and the first prestressed bolt (302a) pass through the corresponding flanges and are connected to the tower column (202) and the connecting platform (301) respectively.

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