Combined wind power generation tower and combination method

Abstract

The invention discloses a combined type wind power generation tower and a combination method, and relates to the field of structural engineering.The combined type wind power generation tower comprises a single-pipe tower assembly, a lattice type tower assembly and a conversion assembly, the single-pipe tower assembly comprises a first flange arranged at the bottom of the single-pipe tower assembly, and the lattice type tower assembly comprises diagonal web members and tower columns; a polygonal space truss is formed by the diagonal web members and the tower columns; the conversion assembly comprises a connecting table arranged between the single-pipe tower assembly and the lattice type tower assembly, the connecting table is connected with the single-pipe tower assembly and the lattice type tower assembly through connecting pieces, and the conversion assembly and the single-pipe tower assembly are hoisted to designated positions through hoisting equipment and are installed respectively. The steel connecting table is connected with the tower column of the lattice type tower assembly through the second prestressed bolts, the steel connecting table is connected with the tower column of the lattice type tower assembly through the first prestressed bolts, and the device is low in manufacturing cost, convenient to construct, large in overall rigidity, simple in structure and reasonable in force transmission.

Description

Technical Field

[0001] The invention relates to the technical field of structural engineering, in particular to a combined wind power generation tower and an assembly method. Background Art

[0002] my country has abundant wind energy resources, but the richest areas are mainly distributed in the three northern regions, while the areas of power demand are concentrated in the low wind speed areas in the central, eastern and southern regions. Therefore, in the early years, this contradiction was mainly solved by building ultra-high voltage transmission lines. However, with the deepening understanding of the characteristics of wind resources in the low wind speed areas in the central and eastern regions, and the rapid development of wind energy resource assessment technology, the potential for wind resource development and utilization has been continuously upgraded. The assessment results of my country's Climate Center show that the technically exploitable amount of onshore wind energy resources at a height of 100 meters is 8.694 billion kilowatts, and at a height of 140 meters is 10.179 billion kilowatts. For low wind speed areas in plains such as Jiangsu, Anhui, Henan, Shandong, Hubei, and Hebei where wind shear is relatively high, by increasing the height of the tower and lifting the wind wheel to an area with higher wind speed, more wind energy can be captured, the power generation of the unit can be increased, and the economic benefits of the wind farm can be effectively improved. Therefore, high-support towers have become the first choice for wind turbines in high shear wind areas.

[0003] The single-tube-lattice combined wind power tower is a solution for high wind towers in low wind speed areas. It combines the advantages of single-tube steel towers and lattice steel towers: the upper part of the tower has a small bending moment and is difficult to install and maintain in the later stage, so a single-tube tower solution can be used, with a small number of connections and relatively simple later maintenance; the lower part of the tower has a large bending moment, so a lattice tower can be used to improve the utilization efficiency of materials, reduce the amount of steel used in the tower and the amount of foundation engineering, but the number of nodes is large. Compared with the traditional single-tube tower, this solution has better lateral stiffness and can avoid resonance between the wind rotor and the supporting structure, but the transition node between the single-tube tower section and the lattice tower section has always been a design difficulty. Most of the tower types currently available on the market use cast steel nodes or complex box-type nodes for transition connection, which are difficult to process and very costly, limiting the application and development of the single-tube-lattice combined wind power tower. Summary of the invention

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

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

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a combined wind power generation tower, comprising a single-tube tower assembly, including a first flange arranged at the bottom of the single-tube tower assembly; a lattice tower assembly, including diagonal webs and tower columns, and a polygonal space truss is formed by the diagonal webs and the tower columns; a conversion assembly, including a connecting platform arranged between the single-tube tower assembly and the lattice tower assembly, and the connecting platform is connected to the single-tube tower assembly and the lattice tower assembly through a connecting piece.

[0007] As a preferred solution of the combined wind power generation tower of the present invention, a second flange is arranged at the end of the tower column; the second flange is distributed in an annular manner around the first flange.

[0008] As a preferred solution of the combined wind power generation tower of the present invention, a polygonal hole is arranged 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 solution of the combined wind power tower described in the present invention, the connecting platform includes a plurality of straight beams and a plurality of inclined beams, and a hidden column is arranged inside the connecting platform corresponding to the tower column; the longitudinal steel bars of the straight beams are anchored in the hidden columns, and the longitudinal steel bars of the inclined beams are anchored in the straight beams.

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

[0011] As a preferred solution of the combined wind power generation tower described in the present invention, the concrete in the range of the second prestressed bolts is in a three-way confining pressure state.

[0012] As a preferred solution of the combined wind power generation tower of the present invention, sleeves are pre-buried at the positions where the first prestressed bolts and the second prestressed bolts are located.

[0013] As a preferred solution of the combined wind power generation tower of the present invention, the first flange can be a T-shaped flange with two outer circles of bolts, or an L-shaped flange with only inner or outer circles of bolts.

[0014] Another object of the present invention is to provide a method for assembling a combined wind power tower, comprising: hoisting a connecting platform above a tower column; connecting a second prestressed bolt to the tower column; hoisting a single-tube tower assembly to the connecting platform; and connecting a first prestressed bolt to the connecting platform.

[0015] As a preferred solution of the combination method of the present invention, the second prestressed bolt and the first prestressed bolt are respectively connected to the tower column and the connecting platform through corresponding flanges.

[0016] The beneficial effects of the present invention are:

[0017] 1. It can be prefabricated and transported in pieces in the factory, wet-connected and assembled on site and then hoisted. It can also be prefabricated directly on the construction site, with low cost and convenient construction;

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

[0019] 3. By optimizing the tower structure, the wind turbine can be lifted to the area with higher wind speed, thereby capturing more wind energy and improving power generation efficiency;

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

[0021] 5. Due to the durability and corrosion resistance of reinforced concrete materials, this conversion node can withstand harsh natural environments and long-term operation fatigue, extending the service life of the tower;

[0022] 6. Simplified node design and reduced connection parts reduce the complexity and cost of subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0024] Figure 1 This is a scene diagram of a combined wind power tower.

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

[0026] Figure 3 This is a diagram of the internal steel structure of a combined wind turbine tower. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0030] Example 1

[0031] Reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, and 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 single-tube tower assembly 100 and the lattice tower assembly 200 are connected by the conversion assembly 300. In specific implementation, the body shape should be determined by first analyzing the combined wind power generation tower as a whole. During the overall analysis, the conversion assembly 300 can be assumed to be a rigid plate. When determining the body shape, the top side width of the lattice tower assembly 200 is determined according to the bottom diameter of the single-tube tower assembly 100 and the connection platform 301, so that there is enough 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, and a polygonal space truss is formed by the diagonal web members 201 and the tower columns 202;

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

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

[0036] Example 2

[0037] Reference Figures 2-3 , which is the second embodiment of the present invention, and this embodiment 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 an annular manner around the first flange 101. The second flange 202a on the tower column 202 of the lattice tower assembly 200 should be as close to the first flange 101 as possible 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 a plurality of straight beams 301b and a plurality of inclined beams 301c, and a hidden column 301d is arranged inside the connecting platform 301 corresponding to the tower column 202;

[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 connecting member 302 includes a first prestressed bolt 302a for connecting the single-tube tower assembly 100 to the connecting platform 301;

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

[0045] Preferably, the concrete within the range of the second prestressed bolt 302b is in a three-way confining pressure state.

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

[0047] Preferably, the first flange 101 may be a T-shaped flange with two outer circles of bolts, or may be an L-shaped flange with only inner or outer circles of bolts.

[0048] When in use, the connection platform 301 can be prefabricated on site, or it can be prefabricated in pieces in a factory according to transportation conditions, with dowels reserved, and assembled into a whole after wet connection on site and then hoisted. The combined wind power generation tower is not only suitable for the connection of combined towers on land, but also for the connection between single-tube towers and pipe frame foundations at sea.

[0049] Example 3

[0050] Reference Figure 1 to Figure 3 , which is the third embodiment of the present invention, and is based on the first two embodiments.

[0051] Specifically, the connecting platform 301 is hoisted above the tower column 202;

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

[0053] Hoist the single-tube tower assembly 100 onto the connecting platform 301;

[0054] The first prestressed bolt 302 a is connected to the connecting platform 301 .

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

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

[0057] When in use, after the lattice tower assembly 200 is installed, the connecting platform 301 is hoisted in place, and then the steel connecting platform 301 is connected to the tower column 202 of the lattice tower assembly 200 through the second prestressed bolts 302b. Then the single-tube tower assembly 100 is hoisted and connected to the connecting platform 301 through the first prestressed bolts 302a, and the construction of the entire conversion node is completed.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A combined wind power tower, characterized in that: include, A single-tube tower assembly (100) comprises a first flange (101) arranged at the bottom of the single-tube tower assembly (100); A lattice tower assembly (200) comprises diagonal web members (201) and tower columns (202), wherein the diagonal web members (201) and the tower columns (202) form a polygonal space truss; The conversion assembly (300) comprises a connecting platform (301) arranged between the single-tube tower assembly (100) and the lattice tower assembly (200); the connecting platform (301) is connected to the single-tube tower assembly (100) and the lattice tower assembly (200) via a connecting piece (302).

2. The combined wind power generation tower according to claim 1, characterized in that: The end of the tower column (202) is provided with a second flange (202a); The second flange (202a) is distributed in an annular manner around the first flange (101).

3. The combined wind power generation tower according to claim 2, characterized in that: 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).

4. The combined wind power generation tower according to claim 3, characterized in that: The connecting platform (301) includes a plurality of straight beams (301b) and a plurality of inclined beams (301c), and a hidden column (301d) is arranged inside the connecting platform (301) corresponding to the tower column (202); 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).

5. The combined wind power generation tower according to claim 4, characterized in that: The connecting member (302) comprises a first prestressed bolt (302a) for connecting the single-tube tower assembly (100) with the connecting platform (301); It also includes a second prestressed bolt (302b) for connecting the tower column (202) and the connecting platform (301).

6. The combined wind power generation tower according to claim 5, characterized in that: The concrete within the range of the second prestressed bolts (302b) is in a three-way confining pressure state.

7. The combined wind power generation tower according to claim 6, characterized in that: Sleeves are pre-buried at the locations where the first prestressed bolt (302a) and the second prestressed bolt (302b) are located.

8. The combined wind power generation tower according to claim 7, characterized in that: The first flange (101) may be a T-shaped flange with two outer circles of bolts, or an L-shaped flange with only inner or outer circles of bolts.

9. A combination method, applied to the combined wind power generation tower according to claims 1 to 8, the method comprising: Hoisting the connecting platform (301) above the tower column (202); Connecting the second prestressed bolt (302b) to the tower column (202); Hoisting the single-tube tower assembly (100) onto the connecting platform (301); The first prestressed bolt (302a) is connected to the connecting platform (301).

10. The combination method according to claim 9, characterized in that: The second prestressed bolt (302b) and the first prestressed bolt (302a) are connected to the tower column (202) and the connecting platform (301) respectively through corresponding flanges.

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