Lattice type wind power tower

Abstract

The invention discloses a lattice type wind power tower, which relates to the field of wind power generation engineering and comprises tower columns, diagonal web members and transverse web members. The tower columns are distributed at the corners and connected through the transverse web members and the diagonal web members. The arrangement form of a vertical face formed by the tower columns, the transverse web members and the diagonal web members is a'big-end-down 'oblique straight line type or variable slope type; the arrangement form of a plane formed by the tower columns and the transverse web members is triangular, square or polygonal, transverse partitions are arranged in the square or polygonal plane formed by the tower columns and the transverse web members, and the arrangement form of the transverse partitions is a brace type. The tower structure is hollowed out, the wind load is small, the hollowed-out part does not affect crop planting and the like, the coordination of the structure and the surrounding environment is better, and the space utilization rate is higher.

Description

Technical Field

[0001] The invention relates to the field of wind power generation engineering, and in particular to a lattice-type wind power tower. Background Art

[0002] As a new energy source with abundant resources, cleanliness and no pollution, wind energy is a potential power energy reservoir. The structure that supports wind turbines to a favorable height to realize the utilization of wind energy is called a wind power tower. Its common structural forms include conical steel tower and steel-concrete tower, but there are certain limitations in actual application. Due to its high cost and low bearing capacity, the conical steel tower is only suitable for lower tower heights and smaller wind turbine power generation. For the increasing demand for wind turbines, the diameter and wall thickness of steel pipes need to be significantly increased, which greatly increases the construction cost. Although the steel-concrete tower improves the shortcomings of the conical steel tower to a certain extent, due to the large size of the pipe segments, it has high requirements for hoisting and road transportation, and the connection between the pipe segments also requires certain on-site wet operations. In addition, the diameter of the lower concrete tower section is usually large, which occupies too much land area. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a lattice wind turbine tower. The tower structure of the present invention is hollow, the wind load is small, and the hollow part does not affect the planting of crops, etc. The structure is better coordinated with the surrounding environment and has a higher space utilization rate.

[0004] The present invention achieves the above technical objectives through the following technical means.

[0005] A lattice wind power tower comprises axially connected tower columns and connecting rods; the tower columns form a polygon in a plane, each tower column is distributed at the corner of the polygon, and the tower columns are connected by connecting rods; the tower columns are prestressed hollow steel tube concrete columns using the pre-tensioning method.

[0006] In the above solution, the facade of the tower is oblique and straight, and the cross section of the bottom of the tower is larger than the cross section of the top.

[0007] In the above solution, the facade of the tower is of a variable slope type, the slope of the upper section is not less than the slope of the lower section, or the upper section is a vertical structure.

[0008] In the above scheme, the connecting rod includes a diagonal web, a transverse web and a transverse partition. The transverse partition is arranged in a plane surrounded by the transverse webs in the same plane. The transverse partition includes a rigid hoop and a prestressed tie rod. One end of the prestressed tie rod is connected to the rigid hoop, and the other end is connected to the transverse web or the tower column.

[0009] In the above solution, a passage for the elevator shaft to pass through is formed in the polygonal space formed by the rigid hoops.

[0010] In the above scheme, the tower column and the transverse web members and the diagonal web members are all connected by tube sheets, the tower column is connected with a node plate, the diagonal web members and the transverse web members are connected to the node plate by bolts, and the diagonal web members are arranged in a cross-type.

[0011] In the above scheme, in the axial direction, the segmentation point between two adjacent tower columns is located on the plane where the transverse web is located, and the wall thickness of the tower columns at different stages decreases in a step-like manner from bottom to top.

[0012] In the above scheme, the tower column is centrifugally formed, and the cross-section of the tower column from the outside to the inside is a steel pipe, concrete and a cavity, and a steel cage composed of prestressed tendons and spiral stirrups is built into the concrete; the position of the spiral stirrups near the end of the tower column is a densification area, and tie bars are provided on two non-adjacent prestressed tendons.

[0013] In the above solution, the two axially connected tower columns are connected by flanges, and stiffening plates are arranged on the outer sides of the ends of the tower columns, and the stiffening plates extend to the position of the flanges.

[0014] The above scheme also includes a tower column foundation, which is formed by connecting a plurality of sub-tower column foundations corresponding to the tower columns through connecting beams, and the sub-tower column foundations include a reserved cup-shaped notch, a certain thickness of leveling mortar is provided at the bottom of the reserved cup-shaped notch, the bottom end of the tower column is placed in the reserved cup-shaped notch, a bottom steel plate is provided at the bottom end of the tower column, and the bottom steel plate is connected to the anchor bolts at the bottom of the reserved cup-shaped notch; concrete is poured in the reserved cup-shaped notch; a plurality of circles of scissor nails are preset on the outer surface of the bottom end of the tower column; a cup-shaped steel mesh is provided between the upper and lower circles of shear nails.

[0015] Beneficial effects of the present invention:

[0016] 1. The lattice tower structure is relatively hollow, with a smaller wind load. When people approach, the psychological effect is better, and the hollow part does not affect the planting of crops, etc. The structure is better coordinated with the surrounding environment and has a higher space utilization rate.

[0017] 2. Adopting oblique straight line or variable slope facade can avoid sweeping the tower, which also fits the maximum force characteristic of the bottom and saves material consumption;

[0018] 3. The tower column is formed by centrifugal process, which has high production efficiency, controllable product quality, and the bonding between concrete and steel pipe is more firmly under the action of centrifugal force.

[0019] 4. The tower column adopts prestressing method, which can ensure that the concrete does not crack when the wind turbine is operating normally, the crack development rate is low, the fatigue life is greatly improved, the risk of concrete spalling during operation is small, and post-tensioning on site is avoided, making construction more convenient.

[0020] 5. The wall thickness of the tower steel pipe decreases in steps with different sections, which can greatly reduce the amount of steel used in the tower without increasing the difficulty of production.

[0021] 6. The diaphragm is arranged in a tie-rod style, leaving a large space in the center to facilitate the passage of the elevator shaft of the tower through the rigid hoop.

[0022] 7. The tower flange connection area is reinforced with spiral hoops and studs, which can effectively improve the stress and fatigue performance of the node.

[0023] 8. The shear nails installed on the surface of the tower column connected to the foundation can make the post-cast concrete and the tower column better coordinate the force, and also increase the ability of the tower column to diffuse the axial force to the outer cladding, so as to reduce the local pressure burden of the concrete at the bottom of the column. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of an oblique straight-line lattice wind power tower involved in an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the variable slope lattice wind power tower structure;

[0026] Figure 3 It is a schematic diagram of the cross section of the tower column;

[0027] Figure 4 Schematic diagram of the plan layout of the braced cross partition Figure 1 ;

[0028] Figure 5 Schematic diagram of the plan layout of the braced cross partition Figure 2 ;

[0029] Figure 6 Schematic diagram of the plan layout of the braced cross partition Figure 3 ;

[0030] Figure 7 Schematic diagram of the plan layout of the braced cross partition Figure 4 ;

[0031] Figure 8 Schematic diagram of the plan layout of the braced cross partition Figure 5 ;

[0032] Fig. 9 It is a schematic diagram of the connection between the tower column and the diagonal brace;

[0033] Fig.10 This is a schematic diagram of the tower column node area reinforcement;

[0034] Fig.11 It is a schematic diagram of the tower triangle from top view;

[0035] Fig.12 It is a top view schematic diagram of the tower quadrilateral;

[0036] Fig.13 It is a schematic diagram of the tower polygon from top view;

[0037] Fig.14 This is a schematic elevation diagram of the tower column flange connection node;

[0038] Fig.15 Schematic diagram of the tower column foundation.

[0039] Reference numerals:

[0040] 1- transverse web member; 2- diagonal web member; 3- rigid hoop; 4- prestressed tie rod; 5- steel pipe; 6- concrete; 7- prestressed tendon; 8- cavity; 9- tower column; 10- bolt; 11- node plate; 12- stud; 13- spiral stirrup; 14- tie bar; 15- tension sleeve; 16- flange; 17- stiffening plate; 18- double nut; 19- wool washer; 20- bottom steel plate; 21- cup-shaped steel mesh; 22- shear nail; 23- reserved cup-shaped notch; 25- bottom steel mesh; 26- leveling mortar; 27- plywood. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Combined with Figure 1-8 , 11-13, a lattice wind power tower, including tower columns 9, diagonal braces 2 and transverse braces 1; the tower columns 9 are distributed at the corners, and the tower columns 9 are connected by transverse braces 1 and diagonal braces 2; the facade layout of the tower columns 9, transverse braces 1 and diagonal braces 2 is as follows: Figure 2 The oblique straight line type of "small on top and large on bottom" as shown in the figure or Figure 1 The variable slope type shown; the plane layout of the tower column 9 and the transverse web 1 is as shown Figure 11-13 As shown: a triangle, a square or a polygon, wherein the square or polygonal plane formed by the tower column 9 and the transverse web 1 is provided with a transverse partition, and the arrangement form of the transverse partition is as follows Figure 4-8 The pull-rod style shown.

[0045] The tie rod type includes prestressed tie rods 4 and rigid hoops 3; the rigid hoop 3 is connected to the transverse web 1 by several prestressed tie rods 4, and the tie rod type connection ensures the stability of the tower cross section and prevents the tower from deforming. The square, polygonal or circular area formed by the rigid hoop 3 can pass through the elevator shaft. Specifically, the rigid hoop 3 is placed in the area formed by the transverse web 1, and its shape is the same as that of the area formed by the transverse web 1 or a circular area. The rigid hoop 3 and the transverse web 1 are connected by prestressed tie rods 4. The hollow area formed by the rigid hoop 3 is convenient for the elevator shaft to pass through. The purpose of setting multiple prestressed tendons is to improve the connection strength between the rigid hoop and the transverse web, thereby ensuring the stability of the overall structure of the tower and improving practicality.

[0046] Combined with Figure 1-2 As shown in the figure, when the variable slope type is adopted, the slope of the upper section is not less than that of the lower section, and the upper section can be made vertical. This avoids sweeping the tower, conforms to the characteristics of the maximum force on the bottom, and saves material consumption.

[0047] In the present invention, the diagonal web members 2 and the transverse web members 1 are both hollow round steel tubes and are arranged in a cross-type arrangement, which can make the tower structure more solid and improve the safety and stability of the tower.

[0048] Along the axial direction, the tower column has several sections, and the section points between the tower columns 9 are located in the plane where the transverse web 1 is located. The outer diameter of the tower column 9 remains unchanged, and the wall thickness of the tower column 9 decreases in steps with different sections.

[0049] The tower column of the present invention is a centrifugally formed prestressed hollow steel tube concrete component, with a circular or square cross section; the cross section of the tower column 9 is a steel tube 5, concrete 6 and a cavity 8 from outside to inside, and the concrete 6 has a prestressed tendon 7 built in. Spiral stirrups 13 are arranged in the concrete at the end of the tower column, wherein the spiral stirrups 13 are close to the inner wall of the tower column, and tie bars 14 are arranged on two non-adjacent prestressed tendons 7; and tensioning sleeves 15 are arranged at the prestressed tendons 7 at the end of the tower column.

[0050] The tower column of the present invention is formed by a centrifugal process, which has high production efficiency, controllable product quality, and the concrete and steel pipe are more firmly bonded under the action of centrifugal force. Fig. 9 As shown, the tower column 9 is connected to the diagonal web member 2 or the transverse web member 1 through the web plate 11; the diagonal web member 2 or the transverse web member 1 is connected to the node plate 11 through the bolt 10. In the present invention, the web plate is connected to the tower column by welding or other means, and the web plate is provided to facilitate the installation of the transverse web member and the diagonal web member. In order to prevent the transverse web member or the diagonal web member from rotating and to improve the connection strength, the transverse web member or the diagonal web member is positioned by a clamp or a clamping plate 23.

[0051] Combined with Fig.10 and 14 As shown, spiral stirrups 13 and studs 12 are arranged in the concrete at the end of the tower column 9, wherein the spiral stirrups 13 are close to the inner wall of the tower column 9, and tie bars 14 are arranged on two non-adjacent prestressed bars 7; and tension sleeves 15 are arranged at the prestressed bars 7 at the end of the tower column 9. Specifically, several tie bars form a circular cavity structure, thereby ensuring the strength of the node at the end of the tower column.

[0052] Combined with Figure 11-13 As shown, the plane arrangement form of the tower column 9 and the transverse web member 1 is a triangle, a square or a polygon, wherein the square or polygonal plane formed by the tower column 9 and the transverse web member 1 is provided with a transverse partition.

[0053] Combined with Fig.14 As shown, flanges 16 are provided at both ends of the tower column 9; the flanges 16 on adjacent tower columns 9 are connected by flange bolts 10. A stiffening plate 17 is provided on the outer side of the end of the tower column 9, and the stiffening plate 17 extends to the position of the flange 16. In the present invention, the tower column 9 is provided as a split structure, which is convenient for manufacturing and transportation. Flanges are provided at both ends of the tower column 9 to facilitate connection and installation. The stiffening plate is provided on the outer side of the tower column 9 to improve the strength of the connection. In order to prevent the bolts from loosening, a double nut plus a wool washer is used.

[0054] Combined with Fig.15 As shown, the tower column foundation includes multiple independent sub-foundations and connecting beams, and a reserved cup-shaped notch 23 is longitudinally arranged on the independent foundation; a bottom steel plate 20 is arranged at the bottom end of the tower column 9, and a leveling mortar 26 is arranged between the bottom steel plate 20 and the bottom of the reserved cup-shaped notch 23, and the bottom steel plate 20 and the bottom of the reserved cup-shaped notch 23 are connected by bolts, and a plurality of circles of shear nails 22 are arranged in the reserved cup-shaped notch 23; a cup-shaped steel mesh 21 is arranged between the upper and lower circles of shear nails 22. In the present invention, the shear nails arranged on the surface of the tower column connected to the foundation can make the post-cast concrete and the tower column better coordinated in force, and also increase the ability of the tower column to diffuse the axial force to the outer cladding, so as to reduce the burden of local pressure on the concrete at the bottom of the tower column.

[0055] Example

[0056] A lattice wind power tower, comprising a tower column 9, a diagonal brace 2, a transverse brace 1 and a diaphragm, wherein a plurality of tower columns 9 are distributed at corners and connected by the diagonal brace 2, the transverse brace 1 and the diaphragm; the plane layout forms include triangle, square and polygon, and the elevation layout forms adopt an oblique straight line type or a variable slope type of "small on top and large on bottom". When the variable slope type is adopted, the slope of the upper section should not be less than that of the lower section, and the upper section can be made vertical if necessary;

[0057] The tower column 9 is a centrifugally formed prestressed hollow steel tube concrete member with a circular or square cross section;

[0058] The tower column 9 is divided into several sections along the axial direction, and the section points are located in the arrangement plane of the transverse web member 1. The outer diameter of the tower column 9 remains unchanged as the height increases, and the wall thickness of the steel pipe decreases in steps with different sections;

[0059] The diagonal web members 2 and the transverse web members 1 are both hollow round steel tubes and are arranged in a cross-type manner;

[0060] For square and polygonal lattice towers, in order to maintain the unchanged cross-sectional geometry, a certain number of diaphragms need to be set, and the setting position is located in the plane of the transverse web arrangement, and the setting form is a brace type composed of a circle of prestressed braces 4 and a rigid hoop 3 in the middle;

[0061] Flanges 16 are provided at both ends of the tower column 9, and the tower columns 9 are connected with flange bolts 10. The concrete at the end of the tower column 9 is reinforced with dense spiral stirrups 13 and studs 12, and the end prestressed tendons 7 are provided with tension sleeves 15. The tower column 9 is bolted to the diagonal web member 2 or the transverse web member 1 through the web plate 11. In the parts involving bolt connection, double nuts 18 and wool washers 19 are used to prevent the bolts from loosening;

[0062] The foundation of the tower column 9 adopts the form of an independent foundation plus a connecting beam, and a cup-shaped notch 23 is reserved on the independent foundation. A bottom steel plate 20 is set at the bottom of the tower column 9. After the leveling mortar 26 is laid on the bottom surface of the reserved cup-shaped notch 23 of the foundation, the bottom steel plate 20 is connected and fixed to the bottom of the reserved cup-shaped notch 23 by anchor bolts; a plurality of circles of shear nails 22 are reserved on the surface of the tower column located in the reserved cup-shaped notch 23; after the tower column 9 falls into the reserved cup-shaped notch, a bidirectional cup-shaped steel mesh 21 is reserved by planting reinforcement, and finally the whole is poured with concrete.

[0063] Among them, the cup-mouth steel mesh 21 has a radial dimension larger than the radial dimension of the reserved cup-shaped notch 10. By arranging scissor nails and cup-mouth steel mesh on the outer side of the tower column, the connection strength between the tower column and the post-cast concrete can be improved, thereby improving the strength of the tower column foundation. The purpose of the cup-mouth steel mesh having an outer diameter larger than the reserved cup-shaped notch is to increase the connection force surface and thus improve the foundation strength of the tower column. The cup-mouth steel mesh 21 is arranged on the outer side of the tower column by welding. A bottom steel mesh 25 is arranged at the bottom end of the reserved cup-shaped notch 10, and the bottom steel mesh 25 is connected to the bottom steel plate 20 by anchor bolts. The bottom steel mesh 25 has a radial dimension larger than the radial dimension of the reserved cup-shaped notch. The bottom steel mesh and the bottom steel plate are connected by anchor bolts to further improve the connection strength and stability.

[0064] The purpose of making the cup-shaped steel mesh and the bottom steel mesh larger than the reserved cup-shaped notch is to improve the ability of the tower column to diffuse the axial force to the outer cladding, thereby reducing the local pressure-bearing burden of the concrete at the bottom of the tower column.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0066] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A lattice wind power tower, characterized in that: It comprises axially connected tower columns and connecting rods; the tower columns are arranged in a polygon in a plane, each tower column is distributed at the corner of the polygon, and the tower columns are connected by connecting rods; the tower columns are prestressed hollow steel tube concrete columns by pre-tensioning method.

2. The lattice wind power tower according to claim 1, characterized in that: The facade of the tower is an oblique straight type, and the cross section of the bottom of the tower is larger than the cross section of the top.

3. The lattice wind power tower according to claim 1, characterized in that: The facade of the tower is of a variable slope type, the slope of the upper section is not less than the slope of the lower section, or the upper section is a vertical structure.

4. The lattice wind power tower according to claim 1, characterized in that: The connecting rod includes a diagonal web, a transverse web and a transverse partition. The transverse partition is arranged in a plane surrounded by the transverse webs in the same plane. The transverse partition includes a rigid hoop and a prestressed brace. One end of the prestressed brace is connected to the rigid hoop, and the other end is connected to the transverse web or the tower column.

5. The lattice wind power tower according to claim 4, characterized in that: The polygonal or circular space formed by the rigid hoops forms a passage for the elevator shaft to pass through.

6. The lattice wind power tower according to claim 4, characterized in that: The tower column and the transverse web members and the diagonal web members are all connected by tube sheets. The tower column is connected with a node plate. The diagonal web members and the transverse web members are connected to the node plate by bolts. The diagonal web members are arranged in a cross-type.

7. The lattice wind power tower according to claim 4, characterized in that: In the axial direction, the segmentation point between two adjacent tower columns is located on the plane where the transverse web is located, and the wall thickness of the tower columns at different stages decreases in a step-like manner from bottom to top.

8. The lattice wind power tower according to claim 1, characterized in that: The tower column is centrifugally formed, and the cross section of the tower column from the outside to the inside is a steel pipe, concrete and a cavity. A steel cage composed of prestressed tendons and spiral stirrups is built into the concrete; the position of the spiral stirrups near the end of the tower column is a densification area, and tie bars are provided on two non-adjacent prestressed tendons.

9. The lattice wind power tower according to claim 1, characterized in that: The two axially connected tower columns are connected by flanges. Stiffening plates are arranged on the outer sides of the ends of the tower columns, and the stiffening plates extend to the position of the flanges.

10. The lattice wind power tower according to claim 1, characterized in that: It also includes a tower column foundation, which is formed by connecting a plurality of sub-tower column foundations corresponding to the tower columns through connecting beams, the sub-tower column foundations including a reserved cup-shaped notch, a certain thickness of leveling mortar is provided at the bottom of the reserved cup-shaped notch, the bottom end of the tower column is placed in the reserved cup-shaped notch, a bottom steel plate is provided at the bottom end of the tower column, and the bottom steel plate is connected to the anchor bolts at the bottom of the reserved cup-shaped notch; concrete is poured in the reserved cup-shaped notch; a plurality of circles of shear nails are preset on the outer surface of the bottom end of the tower column; a cup-shaped steel mesh is provided between the upper and lower circles of shear nails.

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