Fabricated variable cross-section wind power tower

Abstract

The utility model provides an assembly type variable-cross-section wind power tower which is formed by fixedly connecting an upper variable-cross-section truss, a middle constant-cross-section truss and a lower variable-cross-section truss. The sectional area of the upper variable-cross-section truss is gradually increased from top to bottom, and the sectional area of the largest part of the upper variable-cross-section truss is consistent with the sectional area of the middle constant-cross-section truss; the sectional area of the lower variable-cross-section truss is gradually reduced from top to bottom, and the sectional area of the largest part of the lower variable-cross-section truss is consistent with the sectional area of the middle constant-cross-section truss; an external prestressed cable is fixedly connected between the top of the upper variable cross-section truss and the bottom of the lower variable cross-section truss. The tower can be detached into a plurality of small-size single pieces, so that the transportation is convenient. Besides, the external prestressed cable is fixedly connected between the top of the upper variable-section truss and the bottom of the lower variable-section truss, so that an integral tower with prestress is formed between the trusses, and the rigidity and the strength of the tower can meet the design requirements.

Description

Technical Field

[0001] The utility model relates to an assembled variable-cross-section wind power tower, belonging to the technical field of wind power towers. Background Art

[0002] Wind power, along with other renewable energy sources such as solar, geothermal, and nuclear power, has become one of the most attractive clean energy sources globally. Wind turbines convert the aerodynamic force of wind into electricity. The amount of energy generated depends on the rotational speed of the turbine blades, or the wind velocity. By increasing the height of the turbine nacelle, taller tower structures can be used to access sustained and stable winds in both onshore and offshore areas. Taller towers and larger turbine capacities require enhanced stability, strength, and rigidity to support the generator and blades. Consequently, the size and weight of the tower sections also increase, which can be a hurdle in manufacturing and transporting the steel segments. Furthermore, the width of vehicles passing through highways is typically limited to 4.5 meters, which also restricts the size of the structural components. Finally, the tower design must meet requirements for tower base strength, local and global buckling, lateral displacement, and rotation coefficients.

[0003] The tower structure accounts for 20-30% of the total cost of a wind turbine system, so the optimal design of the tower shape and size is of great economic significance. The use of prefabricated tower sections provides an alternative tower structure design that reduces manufacturing and transportation difficulties. Utility Model Content

[0004] Based on the problems raised in the background technology, the utility model proposes an assembled variable-section wind power tower that is easy to transport, has good rigidity and stability, and is simple to assemble.

[0005] The technical solution of the utility model is an assembled variable-section wind power tower, which is formed by fixedly connecting an upper variable-section truss, a middle constant-section truss and a lower variable-section truss.

[0006] Furthermore, the cross-sectional area of ​​the upper variable-section truss gradually increases from top to bottom, and its maximum cross-sectional area is consistent with the cross-sectional area of ​​the middle constant-section truss; the cross-sectional area of ​​the lower variable-section truss gradually decreases from top to bottom, and its maximum cross-sectional area is consistent with the cross-sectional area of ​​the middle constant-section truss.

[0007] Furthermore, an external prestressed cable is fixedly connected between the top of the upper variable-section truss and the bottom of the lower variable-section truss.

[0008] Furthermore, the upper variable-section truss, the middle constant-section truss and the lower variable-section truss each include four angle steel towers, a group of cross bars are fixedly connected from bottom to top between adjacent angle steel towers, and two diagonal bars are symmetrically fixedly connected between the upper and lower adjacent cross bars.

[0009] Furthermore, the end sides of the upper variable-section truss, the middle constant-section truss and the lower variable-section truss are all provided with reinforcement columns, which are arranged on the symmetry line of adjacent angle steel tower columns, and are fixedly connected to two or more cross bars at the same time.

[0010] Furthermore, plane cross-frames are fixed on the end faces of the upper variable-section truss, the middle constant-section truss and the lower variable-section truss, node plates are fixedly connected to the plane cross-frames, and adjacent trusses are fixedly connected with bolts via node plates.

[0011] Furthermore, the crossbars are fixedly connected to the angle steel tower columns, diagonal bars or reinforcement columns via node plates and bolts.

[0012] Due to the adoption of the above technical solution, the advantages of the utility model are:

[0013] 1. The variable cross-section tower of the utility model has a structural form with small ends and large middle, which makes its disturbance smaller, has stronger anti-deformation ability and better stability.

[0014] 2. The assembled variable-section wind turbine tower of the present invention can be disassembled into several small-sized individual pieces for easy transportation.

[0015] 3. The utility model adds external prestressed cables between the upper variable-section truss, the middle constant-section truss and the lower variable-section truss, so that an integral tower with prestress is formed between the trusses, ensuring that the rigidity and strength of the tower can meet the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic elevation diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the axial side of the utility model;

[0018] Figure 3 Schematic diagram of the upper variable-section truss structure;

[0019] Figure 4 Schematic diagram of the constant cross-section truss structure in the middle;

[0020] Figure 5 Schematic diagram of the lower variable-section truss structure;

[0021] Figure 6 It is a partial schematic diagram of the lower variable-section truss;

[0022] Figure 7 Schematic diagram of the connection between the middle constant-section truss and the lower variable-section truss;

[0023] Figure 8 Schematic diagram of the connection between the upper variable-section truss and the middle constant-section truss;

[0024] Figure 9 It is a structural diagram of the plane cross frame.

[0025] Explanation of the reference numerals: 3-tower column, 4-diagonal rod, 5-reinforcement column, 6-cross rod, 7-external prestressed cable, 8-plane transverse diaphragm, 9-node plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example

[0028] The schematic diagram of the assembled variable cross-section wind power tower of the utility model is as follows Figure 1 and Figure 2 As shown, it is composed of an upper variable-section truss, a middle constant-section truss and a lower variable-section truss fixedly connected.

[0029] The cross-sectional area of ​​the upper variable-section truss gradually increases from top to bottom, with its maximum cross-sectional area being consistent with the cross-sectional area of ​​the middle constant-section truss. The cross-sectional area of ​​the lower variable-section truss gradually decreases from top to bottom, with its maximum cross-sectional area being consistent with the cross-sectional area of ​​the middle constant-section truss. Therefore, the variable-section tower of the present invention has a structural form with small ends and a large center, which reduces disturbance, improves deformation resistance, and improves stability.

[0030] See also Figure 1 and Figure 2 An external prestressed cable 7 is fixedly connected between the top of the upper variable-section truss and the bottom of the lower variable-section truss, so that an integral tower with prestress is formed between the trusses, ensuring that the stiffness and strength of the tower can meet the design requirements.

[0031] See also Figures 3 to 9 The upper variable-section truss, the middle constant-section truss and the lower variable-section truss all include four angle steel tower columns 3. A group of cross bars 6 are fixedly connected from bottom to top between adjacent angle steel tower columns 3, and two diagonal bars 4 are symmetrically fixedly connected between the upper and lower adjacent cross bars 6.

[0032] The end sides of the upper variable-section trusses, the middle constant-section trusses, and the lower variable-section trusses are all provided with reinforcing columns 5. The reinforcing columns 5 are arranged on the symmetry lines of the adjacent angle steel tower columns 3, and the reinforcing columns 5 are fixedly connected to two or more crossbars 6 at the same time. Plane crossbars 8 are fixedly connected to the end faces of the upper variable-section trusses, the middle constant-section trusses, and the lower variable-section trusses. Node plates 9 are fixedly connected to the plane crossbars 8, and adjacent trusses are fixedly connected with bolts via the node plates 9. Therefore, the connection strength between the upper variable-section trusses, the middle constant-section trusses, and the lower variable-section trusses is improved by reinforcing columns 5 and plane crossbars 8.

[0033] The crossbar 6 is fixedly connected to the angle steel tower column 3, the diagonal bar 4 or the reinforcement column 5 through the node plate 9 and bolts, thereby realizing a fully assembled connection of the tower.

[0034] The construction of the assembled variable cross-section wind power tower of the utility model can be carried out by the following steps:

[0035] Step 1: First construct the tower foundation, and then install the lower variable-section truss on the tower foundation;

[0036] Step 2: hoist the middle constant-section truss and the upper variable-section truss onto the lower variable-section truss in sequence, and connect the three together to form an assembled variable-section wind turbine tower;

[0037] Step 3: Fix the external prestressed cable 7 between the top of the upper variable-section truss and the bottom of the lower variable-section truss to form an integral tower with prestress between the trusses, ensuring that the stiffness and strength of the tower meet the design requirements.

[0038] In summary, the upper variable-section truss, the middle constant-section truss, and the lower variable-section truss of the present invention can be disassembled into several small individual pieces for easy transportation. Furthermore, external prestressed cables 7 are fixedly connected between the top of the upper variable-section truss and the bottom of the lower variable-section truss, forming a prestressed, integrated tower frame between the trusses, ensuring that the tower's stiffness and strength meet design requirements.

Claims

1. An assembled variable-section wind turbine tower, characterized by: It is composed of an upper variable-section truss, a middle constant-section truss and a lower variable-section truss fixedly connected; the cross-sectional area of ​​the upper variable-section truss gradually increases from top to bottom, and its maximum cross-sectional area is consistent with the cross-sectional area of ​​the middle constant-section truss; the cross-sectional area of ​​the lower variable-section truss gradually decreases from top to bottom, and its maximum cross-sectional area is consistent with the cross-sectional area of ​​the middle constant-section truss.

2. The assembled variable-section wind turbine tower according to claim 1, characterized in that: An external prestressed cable (7) is fixedly connected between the top of the upper variable-section truss and the bottom of the lower variable-section truss.

3. The assembled variable cross-section wind turbine tower according to claim 1, characterized in that: The upper variable-section truss, the middle constant-section truss, and the lower variable-section truss all include four angle steel towers (3), a group of cross bars (6) are fixedly connected from bottom to top between adjacent angle steel towers (3), and two diagonal bars (4) are symmetrically fixedly connected between upper and lower adjacent cross bars (6).

4. The assembled variable cross-section wind turbine tower according to claim 3, characterized in that: The end sides of the upper variable-section truss, the middle constant-section truss and the lower variable-section truss are all provided with reinforcement columns (5), the reinforcement columns (5) are arranged on the symmetry lines of adjacent angle steel tower columns (3), and the reinforcement columns (5) are fixedly connected to two or more cross bars (6) at the same time.

5. The assembled variable-section wind turbine tower according to claim 3, characterized in that: Plane cross-section frames (8) are fixed on the end faces of the upper variable-section truss, the middle constant-section truss and the lower variable-section truss, node plates (9) are fixedly connected to the plane cross-section frames (8), and adjacent trusses are fixedly connected with bolts via the node plates (9).

6. The assembled variable cross-section wind turbine tower according to claim 3, characterized in that: The crossbar (6) is fixedly connected to the angle steel tower column (3), the diagonal bar (4) or the reinforcement column (5) via a node plate (9) and bolts.

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