A transition section for connecting an upper tower section and a lower support leg of a wind turbine tower

Abstract

This utility model discloses a transition section for connecting the upper tower and lower support leg of a wind turbine tower, comprising a steel plate disc load transfer structure, a steel pipe truss sleeve structure, an inner steel tower, and a steel pipe lattice structure. The steel plate disc load transfer structure includes a central steel tower and a steel plate disc. An installation hole is provided at the center of the steel plate disc, and a ring beam is welded to the outer side of the steel plate disc. The central steel tower is installed in the installation hole of the disc. The top of the central steel tower is connected to the upper tower, and the lower part of the central steel tower is connected to the inner steel tower. The lower part of the inner steel tower is connected to the steel pipe lattice structure, which includes inner and outer steel pipes. The steel pipe truss sleeve structure is composed of steel pipes forming a triangular bracing truss structure. Several sets of triangular bracing truss structures are sleeved on the outer side of the inner steel tower. The structure is reliable, has high fatigue resistance, and effectively improves service life.

Description

Technical Field

[0001] This utility model belongs to the field of wind power tower technology, specifically relating to a transition section for connecting the upper tower section and the lower support leg of a wind turbine tower. Background Technology

[0002] With the technological development of the wind power industry, in order to improve power generation efficiency, the volume of a single wind turbine is getting larger and larger, and the height of the turbine hub is also getting higher and higher. As the height of the turbine hub increases, the tower structure with a top steel tower section and lower support legs is gradually becoming the mainstream. The design of the connection and transition section between the top steel tower section and the lower support legs in this tower structure is crucial. This transition section is located under heavy load and complex stress, and is a key part of the safety and reliability of the entire wind turbine tower structure. Under normal circumstances, due to the complex stress on this transition section, it is relatively easy to form concentrated stress, which can easily lead to fatigue failure of the structure, reduce the service life of the wind turbine tower, and even pose a risk of wind turbine tower collapse. Utility Model Content

[0003] In order to overcome the above-mentioned technical problems existing in the existing technical field, the purpose of this utility model is to provide a transition section for connecting the upper tower of a wind turbine tower and the lower support leg, which has a reliable structure, high fatigue resistance, and effectively improves service life.

[0004] This utility model provides a transition section for connecting the upper tower and lower support leg of a wind turbine tower, comprising a steel plate disc load transfer structure, a steel pipe truss sleeve structure, an internal steel tower, and a steel pipe lattice structure. The steel plate disc load transfer structure includes a central steel tower and a steel plate disc. A mounting hole is provided at the center of the steel plate disc, and a ring beam is welded to the outer side of the steel plate disc. The central steel tower is installed in the mounting hole of the disc. The top of the central steel tower is connected to the upper tower, and the lower part of the central steel tower is connected to the internal support leg. The inner steel tower is connected to a steel pipe lattice structure at its lower part. The steel pipe lattice structure includes inner steel pipes and outer steel pipes. The outer steel pipes are connected end to end to form a polygonal ring concentric with the inner steel tower. One end of the inner steel pipe is connected to the inner steel tower, and the other end is connected to the node where the outer steel pipe is connected, together forming a planar lattice structure. The steel pipe truss sleeve structure is composed of steel pipes forming a triangular bracing truss structure. Several sets of triangular bracing truss structures are sleeved on the outside of the inner steel tower.

[0005] The ring beam is made by welding steel pipes or I-beams around the outer ring of a steel plate disc.

[0006] The outer side of the middle section of the central steel tower is fixedly connected to the steel plate disc by welding or flange connection.

[0007] The top of the central steel tower is connected to the upper tower via a flange, and the lower part of the central steel tower is connected to the top of the inner steel tower via a flange or welding.

[0008] The internal steel tower is a variable diameter steel tower, with the diameter gradually decreasing from top to bottom.

[0009] One end of the inner steel pipe is connected to the inner steel tower by welding or flange connection, and the outer steel pipes are connected end to end by welding or bolt connection.

[0010] The triangular bracing truss structure consists of two steel pipes. The upper intersecting truss nodes of the two steel pipes are connected to the ring beam by welding or bolting. The lower ends of the two steel pipes, which are far apart, are connected to the nodes of the outer steel pipe by welding or bolting.

[0011] The steel plate disc can be a single piece or composed of several separate pieces.

[0012] Prestressed steel strands are laid inside the steel pipe.

[0013] This utility model provides a transition section for connecting the upper tower section and the lower support leg of a wind turbine tower. Its advantages lie in the fact that the steel plate disc load transfer structure can efficiently decompose the horizontal and vertical forces of the wind turbine load, allowing them to be transmitted in different directions. Simultaneously, the steel plate disc can be integrated or disassembled according to the specific design of the wind turbine, greatly facilitating actual engineering transportation. The triangular bracing truss structure can convert the horizontal torque and bending moment transmitted by the top steel plate disc load transfer structure into axial forces in the truss steel pipes, which are then transmitted to the lower nodes of the truss. Internal prestressed steel strands improve the fatigue performance of the overall transition section structure. The bottom steel pipe lattice structure, through its planar lattice structure, can bear horizontal loads and resist the bending moment loads of the wind turbine. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the installation structure of one embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of one embodiment of the present invention;

[0016] The image is labeled as follows:

[0017] 1. Upper tower; 2. Central steel tower; 3. Steel plate disc; 4. Ring beam; 5. Inner steel tower; 6. Steel pipe; 7. Outer steel pipe; 8. Support leg; 9. Inner steel pipe; 10. Lower inner support leg. Detailed Implementation

[0018] The following description, with reference to the accompanying drawings and an embodiment, details a transition section provided by this utility model for connecting the upper tower section and the lower support leg of a wind turbine tower.

[0019] Example

[0020] Reference Figure 1-2 This embodiment provides a transition section for connecting the upper tower section and lower support leg of a wind turbine tower. It includes a steel plate disc load transfer structure, a steel pipe truss sleeve structure, an internal steel tower section, and a steel pipe lattice structure. The steel plate disc load transfer structure includes a central steel tower section 2 and a steel plate disc 3. The steel plate disc 3 has a mounting hole at its center, and a ring beam 4 is welded to the outer side of the steel plate disc 3. The top steel plate disc load transfer structure is responsible for decomposing and transmitting the horizontal and vertical forces in the wind turbine load in different directions. The central steel tower section 2 is installed in the disc mounting hole, and the top of the central steel tower section 2... The upper tower 1 is connected to the central steel tower 2, and the lower part of the central steel tower 2 is connected to the inner steel tower 5. The lower part of the inner steel tower 5 is connected to a steel pipe lattice structure, which includes an inner steel pipe 9 and an outer steel pipe 7. The outer steel pipe 7 are connected end to end to form a polygonal ring concentric with the inner steel tower. One end of the inner steel pipe 9 is connected to the inner steel tower 5, and the other end is connected to the node where the outer steel pipe 7 is connected, together forming a planar lattice structure. The steel pipe truss sleeve structure is composed of steel pipes 6 forming a triangular bracing truss structure. Several sets of triangular bracing truss structures are sleeved on the outside of the inner steel tower 5.

[0021] The ring beam 4 is made by welding steel pipes or I-beams around the outer ring of a steel plate disc.

[0022] The outer side of the middle section of the central steel tower 2 is fixedly connected to the steel plate disc 3 by welding or flange connection.

[0023] The top of the central steel tower 2 is connected to the upper tower 1 via a flange, and the lower part of the central steel tower 2 is connected to the top of the inner steel tower 5 via a flange or welding.

[0024] The internal steel tower 5 is a variable diameter steel tower, with the diameter gradually decreasing from top to bottom. The lower part of the internal steel tower 5 is connected to the top node of the lower inner support leg 10 by welding or bolting. This internal steel tower structure bears the vertical load transmitted from the top steel plate disc load transfer structure and transmits it to the lower inner support leg 10.

[0025] One end of the inner steel pipe 9 is connected to the inner steel tower 5 by welding or flange connection. The outer steel pipes 7 are connected end to end by welding or bolt connection. This steel pipe lattice structure bears the horizontal load transmitted from the steel pipe truss sleeve structure and together with the horizontal load borne by the steel plate disc, resists the bending moment load of the wind turbine. At the same time, the horizontal force after the torque and bending moment in the wind turbine load are converted by the top steel plate disc, as well as the horizontal force in the wind turbine load, are transmitted to these nodes through the axial force of the steel pipe components in the steel pipe truss sleeve structure and then to the lower support leg 8.

[0026] The steel pipe 6, the inner steel pipe 9, and the outer steel pipe 7 are all cylindrical steel pipes, and the number of the inner steel pipe 9 and the outer steel pipe 7 are the same.

[0027] The triangular bracing truss structure consists of two steel pipes 6. The upper truss nodes of the two steel pipes are connected to the ring beam 4 by welding or bolting. The lower, more distant ends of the two steel pipes are connected to the nodes of the outer steel pipe by welding or bolting. The steel pipe truss sleeve structure bears the horizontal torque and bending moment transmitted from the top steel plate disc load transfer structure, converting them into axial forces in the truss steel pipes and transmitting them to the lower nodes of the truss. Prestressed steel strands can be arranged inside the steel pipes to improve the fatigue performance of the steel transfer section structure. The upper part of the steel strands is fixed to the ring beam, and the lower part is fixed to the nodes of the outer steel pipes of the bottom steel pipe lattice structure.

[0028] The steel plate disc is an annular disc. Depending on the specific design of the wind tower, it can be a single piece or divided into several pieces for easy transportation.

Claims

1. A transition section for connecting the upper tower section and the lower support leg of a wind turbine tower, characterized in that: The system includes a steel plate disc load transfer structure, a steel pipe truss sleeve structure, an internal steel tower, and a steel pipe lattice structure. The steel plate disc load transfer structure comprises a central steel tower and a steel plate disc. An installation hole is located at the center of the steel plate disc, and a ring beam is welded to the outer side of the disc. The central steel tower is installed in the installation hole of the disc. The top of the central steel tower is connected to an upper tower, and the lower part of the central steel tower is connected to an internal steel tower. The lower part of the internal steel tower is connected to a steel pipe lattice structure. The steel pipe lattice structure includes inner and outer steel pipes. The outer steel pipes are connected end-to-end to form a polygonal ring concentric with the internal steel tower. One end of the inner steel pipe is connected to the internal steel tower, and the other end is connected to the node where the outer steel pipe connects, together forming a planar lattice structure. The steel pipe truss sleeve structure consists of steel pipes forming a triangular braced truss structure, with several sets of triangular braced truss structures sleeved on the outside of the internal steel tower.

2. The transition section for connecting the upper tower section and the lower support leg of a wind turbine tower according to claim 1, characterized in that: The ring beam is made by welding steel pipes or I-beams around the outer ring of a steel plate disc.

3. A transition section for connecting the upper tower section and the lower support leg of a wind turbine tower according to claim 1, characterized in that: The outer side of the middle section of the central steel tower is fixedly connected to the steel plate disc by welding or flange connection.

4. A transition section for connecting the upper tower section and the lower support leg of a wind turbine tower according to claim 1, characterized in that: The top of the central steel tower is connected to the upper tower via a flange, and the lower part of the central steel tower is connected to the top of the inner steel tower via a flange or welding.

5. A transition section for connecting the upper tower section and the lower support leg of a wind turbine tower according to claim 1, characterized in that: The internal steel tower is a variable diameter steel tower, with the diameter gradually decreasing from top to bottom.

6. A transition section for connecting the upper tower section and the lower support leg of a wind turbine tower according to claim 1, characterized in that: One end of the inner steel pipe is connected to the inner steel tower by welding or flange connection, and the outer steel pipes are connected end to end by welding or bolt connection.

7. A transition section for connecting the upper tower section and the lower support leg of a wind turbine tower according to claim 1, characterized in that: The triangular bracing truss structure consists of two steel pipes. The upper intersecting truss nodes of the two steel pipes are connected to the ring beam by welding or bolting. The lower ends of the two steel pipes, which are far apart, are connected to the nodes of the outer steel pipe by welding or bolting.

8. A transition section for connecting the upper tower section and the lower support leg of a wind turbine tower according to claim 1, characterized in that: The steel plate disc can be a single piece or composed of several separate pieces.

9. A transition section for connecting the upper tower section and the lower support leg of a wind turbine tower according to claim 1, characterized in that: Prestressed steel strands are laid inside the steel pipe.

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