Steel tube truss type wind power tower column and web member connecting structure and construction method

Abstract

The application relates to a tower column and web rod connecting structure and construction method of a steel pipe truss type wind power tower, which is used for connecting a tower column and multiple web rods, and the structure comprises multiple node plate groups, connecting plates and high-strength bolts; each node plate group comprises two node plates connected with the outer wall of the tower column in the vertical direction, the web rod is a square steel pipe, two opposite webs of the web rod are arranged at the end portions of the two node plates in the same node plate group to form two connecting positions, one connecting plate is arranged on the two sides of each connecting position, and the web rod and the node plate are connected through the connecting plate and the high-strength bolt. Compared with the prior art, the structural fatigue resistance is further improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-rise steel structure technology and truss type wind power tower technology, in particular to a tower column and web member connecting structure of a steel pipe truss type wind power tower and a construction method. BACKGROUND

[0002] With the continuous rise of the hub center height of the wind power tower, in order to solve the problem of nonlinear rise of steel consumption and sharp decline of structural stiffness of the traditional single pipe tower structure, a truss type wind tower structure scheme appears. As the main force member of the truss type wind tower structure, the tower column and the web member bear alternating loads of tension and pressure. From the perspective of overall stability under compression, it is appropriate to use a steel pipe section. However, the fatigue effect of the wind power tower under the action of wind load and mechanical operation is significant. The connecting structure between the conventional non-coaxial steel pipes is usually a welded joint or a steel plate welded joint, which has a high degree of stress concentration, resulting in weak fatigue resistance. The fatigue life of the joint often becomes the controlling factor of the service life of the tower.

[0003] Chinese patent application 202110870339.7 discloses a steel pipe truss type high wind tower prestressed flexible diagonal web member structure, which comprises a tower column, a cross bar, an arc flange plate, a pair of diagonal steel strands, and a tensioning bracket. The cross bar is connected to the tower column through the arc flange plate. The pair of diagonal steel strands are used to form a prestressed flexible diagonal web member. The lower end of the pair of diagonal steel strands is a locking end, which is locked to the upper part of the arc flange plate. The anchoring point adopts a locking end extrusion type anchor. The upper end of the pair of diagonal steel strands is a tensioning end, which passes through the lower part of the arc flange plate. The tensioning end and the anchoring point in the lower part of the arc flange plate adopt an adjusting end clamp type anchor. The adjusting end clamp type anchor is connected with a lock nut through a thread. The tensioning bracket is fixedly connected with the tower column and is arranged on the extension line of the upper end of the pair of diagonal steel strands, which provides a working platform for the tensioning of the pair of diagonal steel strands. This structure has strong adaptability and good fatigue resistance. However, the construction involves multiple steps such as prestressed tensioning and anchoring, which increases the difficulty and cost of construction. Therefore, it is necessary to redesign a tower column and web member connecting structure for the steel pipe truss type wind power tower to further improve the fatigue resistance of the structure. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a tower column and web member connecting structure of a steel pipe truss type wind power tower and a construction method, which further improves the fatigue resistance of the structure.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] The present application provides a tower column and web member connecting structure of a steel pipe truss type wind power tower, which is used for connecting a tower column and a plurality of web members, comprising a plurality of node plate groups, a connecting plate and high-strength bolts.

[0007] Each node plate assembly includes two vertical node plates connected to the outer wall of the tower column. The web member is a square steel tube, and its two opposing web plates are respectively placed at the ends of the two node plates in the same node plate assembly to form two connection points. A connecting plate is provided on both sides of each connection point. The web member and the node plate are connected by the connecting plate and the high-strength bolt.

[0008] Furthermore, the node plate and the outer wall of the tower column are connected by a weld, with a smooth transition at both ends of the weld.

[0009] Furthermore, a first stiffening plate is arranged circumferentially between each node plate.

[0010] Furthermore, a second stiffening plate is arranged on both sides of each node plate.

[0011] Furthermore, the high-strength bolt is a friction-type high-strength bolt.

[0012] Furthermore, a compensation plate is provided between the web plate of the web member and the connecting plate.

[0013] Furthermore, the contact surfaces between the web plate of the web member, the node plate, the connecting plate, and the compensation plate are all treated with friction surfaces.

[0014] The present invention also provides a construction method for the connection structure between the tower column and the web member of the steel pipe truss wind turbine tower as described above, comprising the following steps:

[0015] S1. Cut the node plate, first stiffening plate, second stiffening plate, connecting plate and differential plate and drill the bolt holes in the factory.

[0016] S2. Welding between the tower column and the node plate, the first stiffening plate and the second stiffening plate is completed in the factory.

[0017] S3. Transport the tower column, web members, connecting plates, compensation plates and high-strength bolts to the project site. Select two opposite web members of the web member. Connect each side of each web member to a connecting plate 6 with installation bolts. Set a compensation plate 7 between the web member and the connecting plate 6.

[0018] S4. Insert the node plate 3 into the gap between the two connecting plates 6, and connect the node plate 3, the connecting plate 6 and the web member 2 with high-strength bolts 8.

[0019] Furthermore, in step S3, each web member is equipped with a full-length mounting bolt, which does not need to be tightened.

[0020] Furthermore, in step S4, a preload is applied to the high-strength bolt to form a friction-type connection node of the high-strength bolt.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the tower column and web member connection structure designed in this invention, the web member and the node plate connected to the tower column are connected and fixed by the connecting plate and high-strength bolts. There is no weld connection between the node plate and the web member, which avoids welding defects and weld toe stress concentration and improves the fatigue resistance of the structure.

[0023] 2. In this invention, the high-strength bolts are friction-type high-strength bolts. The contact surfaces between the web plates, node plates, connecting plates, and supplementary plates of the web members are all treated with friction surfaces. The node plates are inserted into the gap between the two connecting plates to form a double shear friction surface, ensuring that the high-strength bolts and node plates will not slip during the use of the structure. The high-strength bolts only provide preload and do not directly participate in load transfer, making them less prone to loosening and requiring no daily maintenance.

[0024] 3. In this invention, the manufacturing and cutting work such as cutting, drilling, and welding are all completed in the steel structure factory. The welding between the tower column and the node plate, the first stiffening plate and the second stiffening plate is also completed in the factory. First, the web plate supplement plate and the connecting plate are connected by installation bolts. Then, the node plate is inserted into the gap between the two connecting plates, and the high-strength bolts are pre-tightened to form a high-strength bolt friction type connection node, which is convenient for manufacturing and installation.

[0025] 4. This invention can be used in truss-type wind power towers, as well as offshore jacket structures and other structures that have high requirements for the fatigue resistance of the connection nodes between the tower columns and web members, and has a wide range of applications. Attached Figure Description

[0026] Figure 1 This is an assembly drawing of the present invention;

[0027] Figure 2 This is an exploded structural diagram of the present invention;

[0028] Figure 3 This is a cross-sectional view of the connection between the gusset plate and the web members;

[0029] Explanation of reference numerals in the attached drawings: 1. Tower column; 2. Web member; 3. Node plate; 4. First stiffening plate; 5. Second stiffening plate; 6. Connecting plate; 7. Supplementary plate; 8. High-strength bolt. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0031] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] Example 1

[0034] This embodiment provides a connection structure between the tower column and web members of a steel pipe truss wind turbine tower, used to connect the tower column 1 and multiple web members 2, such as... Figure 1 As shown, it includes multiple node plate groups, connecting plate 6 and high-strength bolts 8.

[0035] The tower column 1 is a round steel pipe. Each node plate group includes two node plates 3. The node plates 3 are vertically connected to the outer wall of the tower column 1 by welds. The welds are smoothly transitioned at both ends to reduce the axial stress concentration of the tower column 1.

[0036] Web member 2 is a square steel tube. The two opposing web plates of web member 2 are placed at the ends of the two node plates 3 in the same node plate group, forming two connection points. A connecting plate 6 is set on both sides of each connection point, forming a double shear friction type connection node. Web member 2 and node plate 3 are connected by connecting plates 6 and high-strength bolts 8. The high-strength bolts 8 are friction type high-strength bolts, which have a stronger load-bearing capacity and maintain the stability and safety of the structure.

[0037] like Figure 2 As shown, a first stiffening plate 4 is arranged circumferentially between each node plate 3, and a second stiffening plate 5 is arranged on both sides of each node plate 3. The first stiffening plate 4, the second stiffening plate 5 are connected to the tower column 1 and the node plate 3 by welds to further enhance the structural rigidity.

[0038] like Figure 3 As shown, a compensation plate 7 is provided between the web of the web member 2 and the connecting plate 6 to fill the thickness difference between the node plate 3 and the web of the web member 2, thereby further increasing the stability of the structure.

[0039] The contact surfaces of the web plate, node plate 3, connecting plate 6 and supplementary plate 7 of the web member 2 are all treated with friction surfaces to meet the friction coefficient required by the design and ensure the stability of the structure.

[0040] Example 2

[0041] This embodiment provides a construction method for the connection structure between the tower column and the web member of a steel pipe truss wind turbine tower as described in Embodiment 1, including the following steps:

[0042] 1) The cutting of node plate 3, first stiffening plate 4, second stiffening plate 5, connecting plate 6 and supplementary plate 7 and the drilling of bolt holes are completed in the factory.

[0043] 2) Welding between tower column 1 and node plate 3, first stiffening plate 4 and second stiffening plate 5 is completed in the factory;

[0044] 3) Transport tower column 1, web member 2, connecting plate 6, supplementary plate 7, and high-strength bolts 8 to the project site;

[0045] 4) Select two opposing web plates in the web member 2. Each web plate is connected to a connecting plate 6 on both sides by mounting bolts. A gap-filling plate 7 is set between the web plate and the connecting plate 6. Only one long mounting bolt is needed for each web member 2, and it does not need to be tightened, so that the connecting plate 6 has a certain position adjustment capability.

[0046] 5) Insert the node plate 3 into the gap between the two connecting plates 6 to form a double shear friction surface;

[0047] 6) Install high-strength bolts 8, apply pre-tightening force to the high-strength bolts 8 to form a friction-type connection node of high-strength bolts, and connect the node plate 3, the connecting plate 6 and the web member 2 through the high-strength bolts 8;

[0048] 7) Perform secondary corrosion protection on the node area.

[0049] In the above process, the manufacturing work such as cutting, drilling, and welding is completed in the steel structure factory without involving special processes. On-site, only the bolt preload needs to be applied, which is convenient for manufacturing and installation and improves the utilization rate of materials.

[0050] 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 connection structure between the tower column and web members of a steel pipe truss wind power tower, used to connect the tower column (1) and multiple web members (2), characterized in that, It includes multiple node plate groups, connecting plates (6) and high-strength bolts (8); each node plate group includes two node plates (3) that are vertically connected to the outer wall of the tower column (1), the web member (2) is a square steel tube, and its two opposing web plates are respectively placed at the ends of the two node plates (3) in the same node plate group to form two connection points. A connecting plate (6) is set on both sides of each connection point. The web member (2) and the node plate (3) are connected by the connecting plate (6) and the high-strength bolts (8); A compensation plate (7) is provided between the web plate of the web member (2) and the connecting plate (6); The contact surfaces of the web plate of the web member (2), the node plate (3), the connecting plate (6) and the compensation plate (7) are all treated with friction surfaces.

2. The connection structure between the tower column and the web members of a steel pipe truss wind turbine tower according to claim 1, characterized in that, The outer walls of the node plate (3) and the tower column (1) are connected by a weld, with a smooth transition at both ends of the weld.

3. The connection structure between the tower column and the web members of a steel pipe truss wind turbine tower according to claim 1, characterized in that, The first stiffening plate (4) is arranged circumferentially between each node plate (3).

4. The connection structure between the tower column and the web members of a steel pipe truss wind turbine tower according to claim 1, characterized in that, A second stiffening plate (5) is arranged on both sides of each node plate (3).

5. The connection structure between the tower column and the web members of a steel pipe truss wind turbine tower according to claim 1, characterized in that, The high-strength bolt (8) is a friction-type high-strength bolt.

6. A construction method for the connection structure between the tower column and the web member of a steel pipe truss wind turbine tower as described in claim 1, characterized in that, Includes the following steps: S1. Cut the node plate (3), first stiffening plate (4), second stiffening plate (5), connecting plate (6) and compensation plate (7) and drill bolt holes in the factory; S2. Weld the tower column (1) to the node plate (3), first stiffening plate (4) and second stiffening plate (5) in the factory; S3. Transport the tower column (1), web member (2), connecting plate (6), compensation plate (7) and high-strength bolts (8) to the project site, select two opposite web members of the web member (2), and connect each web member to a connecting plate (6) on both sides by installation bolts. Set a compensation plate (7) between the web member and the connecting plate (6); S4. Insert the node plate (3) into the gap between the two connecting plates (6), and connect the node plate (3), the connecting plate (6) and the web member (2) by high-strength bolts (8).

7. The construction method for the connection structure between the tower column and the web members of a steel pipe truss wind turbine tower according to claim 6, characterized in that, In step S3, each web member (2) is equipped with a full-length mounting bolt, which does not need to be tightened.

8. The construction method for the connection structure between the tower column and the web members of a steel pipe truss wind turbine tower according to claim 6, characterized in that, In step S4, a preload is applied to the high-strength bolt (8) to form a high-strength bolt friction type connection node.

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