Lattice tower, wind power plant

Abstract

The application relates to the wind power technology field and discloses a lattice tower and a wind power generation device. The lattice tower comprises a plurality of pile bodies and a plurality of web members. The plurality of pile bodies are arranged around a preset direction, one end of the plurality of pile bodies is connected to a base, and the other end of the plurality of pile bodies is arranged away from the base. The pile body comprises a plurality of sub-piles which are sequentially spliced together, the sub-pile comprises a hollow pipe body, a concrete structure which is located in the pipe body and attached to the inner wall of the pipe body, and the pile body further comprises a prestressed structure which sequentially penetrates through the plurality of sub-piles. Each web member is connected between two adjacent pile bodies. The lattice tower and the wind power generation device provided by the application can be beneficial to saving production costs and improving production efficiency.

Description

Technical Field

[0001] This application relates to the field of wind power technology, and in particular to a lattice tower and a wind power generation device. Background Technology

[0002] With the continuous development of new energy technologies, various clean and pollution-free power generation systems are being used more and more. Wind power is a pollution-free, renewable, and clean energy source. Wind power generation systems can be installed on land or at sea, and their application range is quite wide. The tower is an important part of the wind power generation system. The tower plays a role in supporting the wind turbine, allowing the wind turbine to be supported at a favorable height so that it can generate wind power in the best location.

[0003] Lattice towers are a common type of tower used in wind turbines. They are formed by assembling and fixing structural components. Because lattice towers have many structural components, improving production efficiency while saving production costs is an important issue. Utility Model Content

[0004] The purpose of this application is to provide a lattice-type tower and a wind power generation device that can help improve production efficiency while saving production costs.

[0005] To address the aforementioned technical problems, this application provides a lattice-type tower. The lattice-type tower includes multiple piles and multiple web members. The multiple piles are arranged around a predetermined direction, with one end connected to a base and the other end disposed away from the base. Each pile includes multiple sub-piles sequentially spliced ​​together. Each sub-pile includes a hollow tube, a concrete structure located within the tube and attached to its inner wall, and a prestressed structure that sequentially passes through the sub-piles. Each web member connects two adjacent piles.

[0006] The embodiments of this application also provide a wind power generation device, which includes the above-described lattice tower or a lattice tower manufactured using the above-described manufacturing method, and a wind turbine. One end of a plurality of piles of the lattice tower is connected to a base; the wind turbine is disposed at the other end of the plurality of piles of the lattice tower.

[0007] The lattice-type tower and wind power generation device provided in this application incorporate composite material sub-piles within the pile body. These sub-piles combine an outer tube with an inner concrete structure, with the concrete rapidly formed on the inner wall of the tube using a centrifugal method. By utilizing the compressive strength of the concrete structure, the thickness of the tube can be reduced, thereby decreasing the material usage and lowering the production cost of the pile. Multiple sub-piles can be joined together to form the pile body, further reducing production costs and improving production efficiency when forming the pile body of the lattice-type tower.

[0008] In some implementations, a hollow area is formed on the side of the concrete structure away from the inner wall of the tube, and the prestressed structure is located within the hollow area.

[0009] In some implementations, the distance between the concrete structure and the central axis of the pipe is 1 / 2 to 2 / 3 of the distance between the outer wall of the pipe and the central axis.

[0010] In some implementations, the prestressed structure includes multiple steel strands spaced apart within the pile.

[0011] In some implementations, multiple steel strands are evenly arranged around the central axis of the pipe body.

[0012] In some implementations, the sub-piles also include multiple reinforcing bars arranged within the concrete structure around the central axis of the pipe body.

[0013] In some embodiments, at least one end of the pipe body is provided with a connecting flange, and any two adjacent sub-piles in the pile body are connected together through the connecting flange.

[0014] In some embodiments, the cross-sectional shape of the tube is rectangular, circular, or elliptical. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a lattice tower provided in some embodiments of this application;

[0017] Figure 2 This is a schematic diagram of the splicing structure of piles in a lattice tower provided in some embodiments of this application;

[0018] Figure 3 This is a cross-sectional structural schematic diagram of the sub-piles in a lattice tower provided in some embodiments of this application;

[0019] Figure 4 This is a schematic diagram of the connection structure between the web members and the piles in a lattice tower provided in some embodiments of this application;

[0020] Figure 5 This is a flowchart illustrating the manufacturing method of a lattice tower provided in some embodiments of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to enable readers to better understand this application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0024] With the continuous development of wind power generation technology, lattice towers are being used more and more in the wind power field. As the most important load-bearing component of the lattice tower, the main truss of the lattice section currently has two common cross-sectional forms: one is that the main truss uses round steel pipes, and the only material used is steel; the other is that the main truss uses double-layer steel pipes, with concrete poured between the two layers of steel pipes.

[0025] For main poles with circular steel pipe cross-sections, steel is less cost-effective than concrete when bearing pressure; that is, the material cost per unit pressure is higher than that of concrete. Therefore, this solution is less economical. For main poles with inner and outer steel pipes and cast concrete, although the economy is improved by introducing concrete under pressure, this solution requires cast-in-place concrete in a factory, which presents the following problems:

[0026] 1. Concrete is generally cured naturally in factories, which has a long curing period, requires a lot of manual labor, and has a low degree of industrialization and automation.

[0027] Second, the concrete needs to be poured from top to bottom. Since a section of the steel pipe is very high, about 15 meters, it is difficult to vibrate and compact the concrete. Furthermore, due to the enclosed space, the pouring quality cannot be detected.

[0028] Therefore, the lattice tower structure currently in use requires a large wall thickness when using round steel pipes, which significantly increases costs. Furthermore, when using inner and outer steel pipes to pour concrete in a lattice tower structure, production efficiency is low, and the pouring quality cannot be guaranteed.

[0029] To reduce production costs while improving production efficiency, some embodiments of this application provide the application of high-bearing-capacity thin-walled steel pipe centrifugal concrete piles in lattice tower structures. This approach utilizes a composite cross-section, fully leveraging the advantages of the outer steel pipe under tension and the inner concrete under compression, without excessively increasing the amount of steel used. Furthermore, it allows for rapid centrifugal molding and autoclaving at the pile manufacturing plant, enabling the concrete to quickly reach its factory strength, resulting in higher production efficiency and a higher degree of industrialization. Additionally, the sub-piles are lightweight and small in size, allowing for transport by ordinary vehicles and rapid on-site assembly, significantly improving construction efficiency and reducing the manufacturing, transportation, and construction costs of the main structure of the lattice tower. Compared to existing technologies, this approach offers lower material costs, more rational cross-sectional stress distribution, and a higher degree of industrialization in manufacturing.

[0030] The following is combined Figures 1 to 4 This application describes the structure of a lattice tower provided in some embodiments.

[0031] like Figures 1 to 4 As shown, some embodiments of this application provide a lattice-type tower including multiple piles 11 and multiple web members 12. The multiple piles 11 are arranged around a predetermined direction, with one end connected to a base and the other end disposed away from the base. Each pile 11 includes multiple sub-piles 111 sequentially spliced ​​together. Each sub-pile 111 includes a hollow tube 1111, a concrete structure 1112 located inside the tube 1111 and attached to its inner wall, and a prestressed structure passing through the multiple sub-piles 111 sequentially. Each web member 12 connects two adjacent piles 11.

[0032] The piles 11 form the column structure of the lattice tower and are the most important load-bearing components. The preset direction is the vertical direction used in the lattice tower. Multiple piles 11 form a symmetrical structure, with one end of each pile 11 fixed to a base formed on the bottom surface, providing a stable foundation and a bottom platform for the lattice tower. The other ends of the multiple piles 11 can be arranged in a mutually converging direction, i.e., the multiple piles 11 can form a structure that is wide at the bottom and narrow at the top. Alternatively, the multiple piles 11 can be arranged in mutually parallel directions, i.e., the multiple piles 11 have a consistent width in the height direction.

[0033] The pile body 11 comprises multiple sub-piles 111 along its length. Each sub-pile 111 is spliced ​​at its end face to form a relatively long main shaft. The sub-piles 111 are constructed by combining hollow tubes with concrete, with the concrete adhering to the inner wall of the tube body 1111. The tube body 1111 can be made of steel pipe with a circular, rectangular, or elliptical cross-section. The concrete is rapidly formed on the inner wall of the tube body 1111 using a centrifugal method, which fully utilizes the high bending resistance of steel and the high compressive strength of concrete, thereby improving the load-bearing capacity of the pile body 11 and increasing the production efficiency of the pile body 11.

[0034] The pile body 11 also includes a prestressed structure passing through multiple sub-piles 111. The prestressed structure can apply prestress to the pile body 11, thereby improving the bearing capacity and durability of the pile body 11.

[0035] Web members 12 connect the areas between two adjacent piles 11, forming a single unit by connecting multiple piles 11. Web members 12 are sequentially arranged along the height of the piles 11, with some ends connected to the same node plate 112 of the piles 11. The node plate 112 is fixed to the outer wall of the pipe body 1111, and has multiple fixing holes. Connecting plates 121 can be installed at the ends of the web members 12, and the connecting plates 121 are fixed to the node plate 112 by fasteners 102. The web members 12 can be arranged in a single diagonal type, a cross diagonal type, a K-type web member, or a multi-branch type.

[0036] The lattice tower provided in some embodiments of this application incorporates composite material sub-piles 111 within the pile body 11. The sub-piles 111 are formed by combining an outer tube 1111 with an inner concrete structure 1112. The concrete can be rapidly formed on the inner wall of the tube 1111 using a centrifugal method. By utilizing the compressive strength of the concrete structure 1112, the thickness of the tube 1111 can be reduced, thereby reducing the material usage of the tube 1111 and lowering the production cost of the pile body 11. Multiple sub-piles 111 can be spliced ​​together to form the pile body 11, thus reducing production costs and improving production efficiency when forming the pile body 11 of the lattice tower.

[0037] like Figure 3As shown, a hollow area can be formed on the side of the concrete structure 1112 away from the inner wall of the pipe body 1111, and the prestressed structure is located in the hollow area.

[0038] When concrete is attached to the inner wall of the pipe 1111 using a centrifugal method, a hollow area can be formed within a certain range near the central axis of the pipe 1111. The hollow area facilitates the installation of prestressed structures using the post-tensioning method, provides more favorable space for the prestressed structure to pass through, and allows the prestressed structure to pass through without much obstruction.

[0039] In addition, in order to save materials and reduce costs, the thickness of the concrete structure 1112 attached to the inner wall of the pipe body 1111 can be controlled. The inner ring of the concrete structure 1112 can be formed near the inner wall of the pipe body 1111, and a large hollow area can be formed at the center of the pipe body 1111.

[0040] In some embodiments, the distance between the concrete structure 1112 and the central axis of the pipe 1111 is 1 / 2 to 2 / 3 of the distance between the inner wall of the pipe 1111 and the central axis.

[0041] In other words, the inner ring interface of the concrete structure 1112 is located between the midpoint of the central axis inside the pipe body 1111 and the inner wall of the pipe body 1111, and between one-third of the way down from the inner wall of the pipe body 1111. By controlling the thickness range of the concrete structure 1112 within the pipe body 1111, it is possible to avoid insufficient load-bearing capacity due to thin concrete material, and also to avoid increasing the manufacturing cost of the pile body 11 due to thick concrete material. When the pipe body 1111 uses a circular steel pipe, the concrete structure 1112 forms a regular ring shape, and the distance between the inner and outer ring interfaces of the concrete structure 1112 can be between 1 / 2 and 2 / 3 of the radius of the circular steel pipe.

[0042] In some embodiments, the prestressed structure may include multiple steel strands 1113, which are spaced apart from each other within the pile body 11.

[0043] The steel strand 1113 is formed by twisting multiple steel wires together. These strands are all located inside the pile body 11, passing through the interior of multiple sub-piles 111. Through tensioning and anchoring, the steel strands 1113 are fixed inside the pile body 11, creating prestress within the pile body 11 to improve its load-bearing capacity. By setting the number of steel strands 1113 to two, three, or more, the load-bearing capacity can be effectively increased in tall lattice towers. In practice, the prestressed structure can also use single or multiple reinforcing bars.

[0044] In practice, the number of steel strands 1113 can be greater than or equal to two, such as... Figure 3 As shown, the number of steel strands 1113 can be four. The four steel strands 1113 are arranged around the central axis of the pipe body 1111. The number of steel wires in the steel strands 1113 can be three, seven, or nineteen. In practice, the ultimate strength standard value can be 1570 N / mm². 2 1860N / mm 2 Or 1960 N / mm 2 Steel strand of the same specifications, 1113.

[0045] In some embodiments, multiple steel strands 1113 may be evenly arranged around the central axis of the tube body 1111.

[0046] In other words, multiple steel strands 1113 are distributed around the central axis of the pipe body 1111, which can form a relatively uniform prestressed structure arrangement at multiple positions around the central axis of the pipe body 1111, thereby forming a uniformly distributed prestress inside the pile body 11.

[0047] like Figure 3 As shown, the sub-pile 111 may also include multiple reinforcing bars 1114, which are arranged around the central axis of the pipe body 1111 within the concrete structure 1112.

[0048] In other words, a ring of reinforcing bars 1114 is arranged around the central axis of the pipe body 1111 within the concrete structure 1112. Through the interaction between the reinforcing bars 1114 and the concrete structure 1112, the performance of the concrete structure 1112 can be improved, ensuring its tensile strength. For example... Figure 3 As shown, the reinforcing bars 1114 can be positioned close to the inner ring interface of the concrete structure 1112, and the number of reinforcing bars 1114 can be 8, 10, 12, or as shown. Figure 3 The 16 reinforcing bars shown. The end of the reinforcing bar 1114 can be fixed to a connecting component at the end of the pipe body 1111, such as a connecting flange 101, so that the edge of the connecting flange 101 can extend to the inner ring interface near the concrete structure 1112 in order to provide a fixed foundation for the reinforcing bar 1114.

[0049] In some embodiments, at least one end of the pipe body 1111 may be provided with a connecting flange 101, and any two adjacent sub-piles 111 in the pile body 11 are connected together through the connecting flange 101.

[0050] like Figure 2As shown, the ends of two adjacent sub-piles 111 are connected together at the splicing position by a connecting flange 101. The connecting flange 101 is located at the end of the sub-pile 111, that is, at the end of the pipe body 1111 of the sub-pile 111. The connecting flange 101 can abut against the end of the pipe body 1111, or be fitted onto the outer wall of the pipe body 1111, with the end face of the connecting flange 101 flush with the end face of the pipe body 1111. The connecting flange 101 has multiple mounting holes through which fasteners 102 can pass to form a connection. The connecting flange 101 can form a connecting platform at the end of the pipe body 1111. In two adjacent sub-piles 111, the two connecting flanges 101 at the ends of the two pipe bodies 1111 that are close to each other abut together and are fixed together by bolts, thereby splicing multiple sub-piles 111 to form a complete pile body 11 through the connecting flanges 101 at the ends of the pipe bodies 1111.

[0051] In practice, the sub-piles 111 can be prefabricated in the factory. Concrete is adhered to the inner wall of the outer steel pipe using centrifugal technology, and after curing, the sub-piles 111 are formed. After the upper and lower connecting flanges are fabricated in the factory, the corresponding upper and lower connecting flanges are welded to both ends of the outer steel pipe. In the factory, the node plates 112 are welded to the corresponding sides of the outer steel pipe, and the connecting plates 121 are inserted into the slots of the web members 12 and welded to them, completing the factory production of all prefabricated components.

[0052] After transporting components such as sub-piles 111 and steel web members to the site, assembly is carried out on-site. Once the foundation construction is completed, sub-piles 111 are hoisted using lifting equipment. The connecting plates 121 of the steel web members are connected to the node plates 112 of the sub-piles 111 with bolts to connect multiple sub-piles 111 on the same floor. Sub-piles 111 are hoisted and assembled sequentially from bottom to top, and the upper and lower connecting flanges of adjacent segments are connected with bolts to complete the splicing of sub-piles 111. After the lattice tower is assembled, the prestressed steel strands 1113 are tensioned. Finally, the other components and equipment of the tower are installed, completing the overall assembly of the lattice tower.

[0053] Some embodiments of this application also provide a method for manufacturing the above-mentioned lattice tower, such as... Figure 5 As shown, the manufacturing method of the above-mentioned lattice tower includes the following steps:

[0054] Step S110: Connect the web members to multiple sub-piles to form a tower unit. The sub-piles include a hollow tube and a concrete structure located inside the tube and attached to the inner wall of the tube.

[0055] Step S120: Connect multiple tower units together to form a pile body 11 by connecting multiple sub-piles located in the same direction;

[0056] Step S130: Pass the prestressed structure through the pile, tension and anchor the prestressed structure.

[0057] The lattice-type tower constructed using the methods provided in some embodiments of this application can improve the tower's load-bearing capacity and reduce material, production, and transportation costs. The sub-piles of the pile body consist of an outer ring of steel pipes, concrete, and prestressed steel strand bundles within the concrete ring. During sub-pil construction, the outer ring of steel pipes, placed on a production mold, is rapidly rotated using a centrifugal method, and concrete is injected. Under centrifugal force, the concrete tightly bonds with the outer ring of steel pipes, and the concrete itself quickly achieves compaction. The prestressed steel strand bundles are tensioned using a post-tensioning method, with the upper and lower ends fixed to anchor clamps. Grooves are cut at the ends of the steel web members, connecting plates are inserted, and welded to the connecting plates. The connecting plates are bolted to the node plates, and the node plates are welded to the outer ring of steel pipes. After the sub-piles and steel web members within one pipe section height are assembled, a lattice-type tower load-bearing unit is formed. Upper and lower connecting flanges are welded to the ends of the upper and lower outer ring of steel pipes, respectively, and bolted together to connect the upper and lower sub-piles into a single unit. After different stress-bearing units are vertically assembled, a lattice-type tower is formed, and prestressed steel strand bundles are tensioned and fixed.

[0058] In practice, the number of sub-piles constituting a single-layer steel-concrete composite tower unit can be three, four, or more, and the outer contour of the tower unit can be a regular polygon. Furthermore, the concrete attached to the inner wall of the pile can be ordinary concrete, high-strength concrete, UHPC (Ultra-High Performance Concrete), ECC (Engineered Cementitious Composite), or other concrete materials. The cross-sectional shape of the pile can be a regular shape such as rectangular, circular, or elliptical, or an irregular shape. The materials for the steel pipes and steel web members can be ordinary steel, high-strength steel, or stainless steel.

[0059] The pile body adopts a centrifugal steel-concrete composite structure, which improves the local stability of the steel pipe, reduces the wall thickness of the steel pipe, saves steel, reduces component weight, and lowers material costs and tower transportation and hoisting costs. The sub-piles are prefabricated in the factory, resulting in high production efficiency and a high degree of industrialization. They can be transported to the site for rapid assembly, reducing construction time and improving production and construction efficiency. The lattice tower using this type of pile reduces component size, lowers tower wind load, and improves the overall stability and load-bearing capacity of the tower. It has a wide range of applications and can be used in high-tower, high-load wind turbine applications. The lattice tower uses a plate-type connection between the pile body and the web members, which is simple in structure, facilitates construction, and improves construction quality.

[0060] The lattice-type tower adopts an external prestressed structure. The internal hollow structure formed by the processing of the piles becomes a natural cavity for the external prestressed steel strands. The prestressing system applies preload to the piles, which can effectively prevent tensile cracking of the concrete and improve the structural performance of the components. The lattice-type towers provided in some embodiments of this application have advantages such as low material cost, reasonable cross-sectional stress, and high degree of industrialization in manufacturing. Rapid prefabrication and assembly improve production and construction efficiency, reducing the manufacturing and construction costs of wind turbine towers.

[0061] Some embodiments of this application also provide a wind power generation device. The wind power generation device includes the lattice tower described above or a lattice tower manufactured using the above-described manufacturing method, and a wind turbine generator. One end of a plurality of piles of the lattice tower is connected to a base; the wind turbine generator is disposed at the other end of the plurality of piles of the lattice tower.

[0062] The base can be formed on land or sea. The bottom of the lattice tower can be fixed to the base, and the top of the lattice tower can form an installation platform for arranging the wind turbine. In practice, the wind turbine can consist of a tower section, the bottom of which can be fixed to the lattice tower, and the generator set can be installed on top of the tower section. By using a lattice tower, the wind turbine can be positioned at a suitable height, allowing it to fully utilize the wind energy available in the surrounding environment and generate electricity under optimal conditions.

[0063] Those skilled in the art will understand that the above embodiments are specific implementations of this application, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this application.

Claims

1. A lattice-type tower, characterized in that, include: Multiple piles are arranged around a preset direction. One end of each pile is connected to a base, and the other end of each pile is located away from the base. Each pile includes multiple sub-piles that are sequentially spliced ​​together. Each sub-piles includes a hollow tube and a concrete structure located inside the tube and attached to the inner wall of the tube. The pile also includes a prestressed structure that passes through the multiple sub-piles sequentially. Multiple web members, each of which is connected between two adjacent piles.

2. The lattice tower according to claim 1, characterized in that, The concrete structure forms a hollow area on the side away from the inner wall of the pipe, and the prestressed structure is located within the hollow area.

3. The lattice tower according to claim 1, characterized in that, The distance between the concrete structure and the central axis of the pipe is 1 / 2 to 2 / 3 of the distance between the outer wall of the pipe and the central axis.

4. The lattice tower according to claim 1, characterized in that, The prestressed structure includes multiple steel strands, which are spaced apart within the pile body.

5. The lattice tower according to claim 4, characterized in that, Multiple steel strands are evenly arranged around the central axis of the pipe body.

6. The lattice tower according to claim 1, characterized in that, The sub-piles also include multiple reinforcing bars, which are arranged within the concrete structure around the central axis of the pipe body.

7. The lattice tower according to claim 1, characterized in that, At least one end of the pipe is provided with a connecting flange, and any two adjacent sub-piles in the pile body are connected together through the connecting flange.

8. The lattice tower according to claim 1, characterized in that, The cross-sectional shape of the tube is rectangular, circular, or elliptical.

9. A wind power generation device, characterized in that, include: The lattice tower according to any one of claims 1 to 8, wherein one end of one or more piles of the lattice tower is connected to the base; The wind turbine is located at the other end of one of the piles of the lattice tower.

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