Fabricated transition section of prestressed lattice type tower and tower

Abstract

The invention provides an assembly type transition section of a prestressed lattice type tower and the tower, belongs to the technical field of fan technologies, and aims to solve the technical problem that the transition section of the fan tower is inconvenient to transport due to limitation of the structural size. Comprising lattice type corner columns, a main cylinder body, column-column connecting structures and column-cylinder connecting structures. The lattice type corner columns are parallel to the axis of the main cylinder, the column-column connecting structures are connected between the adjacent lattice type corner columns and form a closed frame, the main cylinder is located in the frame, and the column-cylinder connecting structures are connected between the lattice type corner columns and the main cylinder. The column-column connecting structure and the column casing connecting structure are connected in an assembled mode. And the technical effects that the assembly type design is adopted, and the overall size can be adjusted through parts are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular to an assembled transition section of a prestressed lattice tower and a tower. Background Art

[0002] In the field of wind turbine applications, lattice towers are a common structural form, typically consisting of a tower body, a transition section, and a turbine mounting platform. The tower body, with its larger cross-section, serves as the primary load-bearing structure of the entire tower and plays a crucial supporting role. The turbine mounting platform, with its relatively smaller cross-section, is specifically used for installing the wind turbine. The transition section, located between the two, plays a crucial role in connecting and transitioning, ensuring a smooth connection between the wind turbine and the tower body.

[0003] However, existing wind turbine lattice tower transition sections present several challenges. Because transition sections are often manufactured in one piece, their dimensions are fixed after production and cannot be adjusted to meet specific installation requirements. This not only limits the applicability of the transition section but also creates significant inconvenience during installation.

[0004] Furthermore, the integrated transition section also presents significant drawbacks during transportation. Its fixed and large size limits it to numerous transportation tools and routes, making it difficult and costly to transport, adversely impacting the overall installation and operation of the wind turbine. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention proposes an assembled transition section and tower of a prestressed lattice tower, which are used to solve the technical problem that the transition section of the wind turbine tower is inconvenient to transport due to structural size limitations.

[0006] The technical solution adopted by the present invention is an assembled transition section of a prestressed lattice tower and a tower.

[0007] Among them, an assembled transition section of a prestressed lattice tower comprises a lattice corner column, a main cylinder, a column-to-column connection structure, and a column-to-cylinder connection structure; The column-column connection structure is connected between adjacent lattice corner columns to form a closed frame, the main cylinder is located inside the frame, and the column-tube connection structure is connected between each lattice corner column and the main cylinder; The column-column connection structure and the column-tube connection structure both adopt assembled connection.

[0008] Optionally, the column-column connection structure includes a small node plate and a horizontal rod, and a small node plate is provided on opposite sides of each of two adjacent lattice corner columns, one side of the small node plate is fixedly connected to the lattice corner column, and the other side faces the other lattice corner column, and both ends of the horizontal rod are respectively connected to the two small node plates.

[0009] Optionally, the column-tube connection structure includes a large node plate, a diagonal brace and a transverse brace, one side of the large node plate is fixedly connected to the lattice corner column, and the other side faces the main cylinder body, and a first connection structure and a second connection structure are provided on the main cylinder body, the diagonal brace is obliquely connected between the large node plate and the first connection structure, and the transverse brace is horizontally connected between the large node plate and the second connection structure.

[0010] Optionally, the first connection structure is an oblique positioning blind hole provided on the main cylinder; the second connection structure is a horizontal positioning hole provided on the main cylinder, and the horizontal positioning hole is a blind hole or a through hole.

[0011] Optionally, the first connection structure and the second connection structure are welding surfaces respectively provided at the ends of the diagonal brace and the transverse brace and matching the outer shape of the main cylinder, and are welded to each other using intersecting line welds.

[0012] Optionally, the node plate and the lattice corner column are connected by welding.

[0013] Optionally, a groove is formed at the end of the horizontal rod and is inserted into the small node plate for fitting and then connected by welding, and / or, a transition clamp and friction bolts are provided at the fitting portion of the horizontal rod and the small node plate through bolt holes for fastening.

[0014] Optionally, grooves are provided at the ends of the diagonal braces and transverse braces and are inserted into and fitted with the large node plates and then connected by welding, and / or, transition clamps and friction bolts are provided at the fitting parts of the diagonal braces and transverse braces and the large node plates to fasten the connection.

[0015] Optionally, a wavy-shaped superelastic metal energy-absorbing area is provided on both sides of the insertion and matching area of the diagonal brace and the large node plate, and the friction-type bolt is also made of a superelastic metal material.

[0016] Among them, a prestressed lattice tower, the wind turbine mounting platform of the tower and the tower body are connected by the assembled transition section of the prestressed lattice tower as described above.

[0017] It can be seen from the above technical solution that the beneficial technical effects of the present invention are as follows: The prefabricated design frees the overall structure from the fixed dimensions of traditional, one-piece manufacturing. Components can be disassembled for transport, significantly reducing transportation complexity and avoiding the inconvenience caused by oversized components. On-site, the components can be quickly assembled using column-to-column and column-to-tube connections. The overall dimensions can be flexibly adjusted based on actual needs, enhancing installation convenience and applicability, demonstrating promising application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0019] Figure 1 It is a three-dimensional schematic diagram of the whole.

[0020] Figure 2 It is a top view schematic diagram.

[0021] Figure 3 It is a side view schematic diagram.

[0022] Figure 4 It is a schematic diagram of the local structure.

[0023] Figure 5 It is a top view schematic diagram of the connection between the diagonal brace and the main cylinder.

[0024] Reference numerals: main cylinder 10 , lattice corner column 20 , large node plate 21 , small node plate 22 , diagonal brace 30 , diagonal insert plate 31 , energy absorption zone 310 , diagonal insert bolt 311 , horizontal rod 40 , flat insert plate 41 , flat insert bolt 411 , transverse brace 50 , transverse insert plate 51 , transverse insert bolt 511 . DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0026] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0027] Among them, a prestressed lattice tower assembly transition section, please refer to the attached Figure 1 ,A possible implementation is as follows: It includes lattice corner columns 20, a main cylinder 10, a column-column connection structure, and a column-cylinder connection structure. The cross-sections of the corner columns 20 and the main cylinder 10 can be circular or other cross-sections. The axes of the lattice corner columns 20 and the main cylinder 10 are parallel, the column-column connection structure connects adjacent lattice corner columns 20 to form a closed frame, the main cylinder 10 is located inside the frame, and the column-column connection structure connects each lattice corner column 20 and the main cylinder 10; Both the column-column connection structure and the column-tube connection structure adopt assembled connection. The assembled connection referred to here means that the lattice corner columns 20, the main tube body 10, the column-column connection structure and the column-tube connection structure are all scattered parts when leaving the factory, and are assembled and connected into one after arriving at the site. Moreover, according to the different sizes of the lattice tower body and the wind turbine mounting platform, the number of lattice corner columns 20 during assembly can be adjusted to construct tower bodies with different cross-sections such as triangles, rectangles, and hexagons. Correspondingly, for tower bodies with different cross-sectional sizes, it is only necessary to replace different connection structures, so that the lattice corner columns 20 and the main tube body 10 have strong versatility and can be applied to wind turbine towers with various cross-sectional shapes and sizes.

[0028] In addition, due to structural design, the dimensions of existing wind turbine transition sections are mostly fixed and cannot be adjusted at will. Furthermore, due to transportation restrictions, the transition section design is subject to many limitations, making it difficult to meet the requirements of large towers. This transition section, through its prefabricated design, has the advantages of a reasonable structure, high stability, prefabricated construction, and simple installation and operation, overcoming the shortcomings of the existing technology.

[0029] In one possible implementation, see the attached Figure 1 and Figure 2 The column-column connection structure includes a small node plate 22 and a horizontal rod 40. A small node plate 22 is provided on the opposite sides of each adjacent lattice corner column 20. One side of the small node plate 22 is fixedly connected to the lattice corner column 20, and the other side faces the other lattice corner column 20. The two ends of the horizontal rod 40 are respectively connected to the two small node plates 22.

[0030] In one possible implementation, see the attached Figure 1 and Figure 2 The column-tube connection structure includes a large node plate 21, a diagonal brace 30 and a transverse brace 50. One side of the large node plate 21 is fixedly connected to the lattice corner column 20, and the other side faces the main cylinder 10. The main cylinder 10 is provided with a first connection structure and a second connection structure. The diagonal brace 30 is obliquely connected between the large node plate 21 and the first connection structure, and the transverse brace 50 is horizontally connected between the large node plate 21 and the second connection structure.

[0031] Furthermore, in a possible embodiment, the first connecting structure is an oblique positioning blind hole provided on the main cylinder 10, and the diagonal brace 30 is inserted into and limited in the positioning blind hole; the second connecting structure is a horizontal positioning hole provided on the main cylinder 10, and the horizontal positioning hole is a blind hole or a through hole. When the horizontal positioning hole is a blind hole, the cross brace 50 is inserted into and limited in the blind hole. When the horizontal positioning hole is a through hole, two of the lattice corner columns 20 supporting the main cylinder 10 are connected by the same cross brace 50. As an optional embodiment, after the cross brace 50 and the oblique brace 30 are inserted into the main cylinder 10, the intersection of the brace and the surface of the main cylinder 10 can be connected to the main cylinder 10 as a whole by welding. According to the installation direction of the fan, the second connecting structure perpendicular to the rotation plane of the fan can be a through hole, and the second connecting structure in other directions can be a blind hole, so as to ensure that each cross brace 50 is at the same horizontal height, while enhancing the structural integrity of the fan axial direction.

[0032] As an alternative to the above embodiment, in a possible implementation, see the attached Figure 2 The first and second connecting structures are welding surfaces located at the ends of the diagonal brace 30 and the transverse brace 50, respectively, and matching the outer shape of the main cylinder 10. They are connected to each other using intersecting line welds. Before welding, the end of the workpiece to be welded is machined into a specific shape and then aligned with the main cylinder 10 to form a groove, called a groove. The main purpose of the groove is to achieve complete penetration. In addition, the composition and properties of the weld can be adjusted, crystallization conditions can be improved, and joint performance can be enhanced. Those skilled in the art can design and construct the welding surface and groove based on their experience and relevant technical manuals.

[0033] In the above embodiment, the cross-sections of the horizontal brace 50, the diagonal brace 30 and the horizontal rod 40 are preferably circular, but other cross-sections are also possible. Figure 4 The gusset plates, including the small gusset plate 22 and the large gusset plate 21, are welded to the lattice corner column 20. The corner column 20 can be designed as a concrete-filled steel tube structure, with an outer steel tube and an interior filled with concrete. Through-holes are provided in the concrete-filled steel tube, through which the gusset plates pass. Part of the gusset plate solidifies with the concrete, while part of the gusset plate protrudes externally. The gusset plate is welded to the point where the steel tube passes through. For scenarios with lower loads, the corner column 20 can also be a single steel tube structure, with the gusset plate welded directly to the outer surface of the steel tube.

[0034] In one possible implementation, see the attached Figure 4 The ends of the horizontal rods 40 are grooved and inserted into the small node plates 22 for fitting and then welded together, and / or the mating parts of the horizontal rods 40 and the small node plates 22 are fastened together by bolt holes and transition plates and friction bolts. Figure 4As shown, the small node plate 22 is provided with bolt holes. Two flat inserts 41 are sandwiched on either side of the small node plate 22, each with bolt holes in the same position. Flat insert bolts 411 secure the flat inserts 41 and the small node plate 22 together. The other end of the flat insert 41 is then inserted into the groove of the horizontal rod 40, and the horizontal rod 40 and flat insert 41 are welded together. If there is a gap between the two flat inserts 41, a steel plate can be inserted and welded together. Friction bolts are a type of bolt that uses the bolt preload to generate sufficient friction between the contact surfaces of the connected parts to transmit shear forces and prevent relative sliding of the connected parts.

[0035] In one possible implementation, see the attached Figure 4 The ends of the diagonal brace 30 and the cross brace 50 are provided with grooves and are inserted into the large gusset plate 21 for fitting and then welded together, and / or, the matching parts of the diagonal brace 30 and the cross brace 50 and the large gusset plate 21 are provided with transition clamps and friction bolts through bolt holes for fastening. Figure 4 As shown, the large gusset plate 21 is provided with bolt holes. Two transverse inserts 51 are clamped on either side of the large gusset plate 21, each with bolt holes in the same position. Transverse inserts 51 and the large gusset plate 21 are fastened together using transverse bolts 511. The other end of the transverse insert 51 is then inserted into the groove of the cross brace 50, and the cross brace 50 and transverse inserts 51 are then welded together. Similarly, the diagonal braces 30 are connected using diagonal inserts 31 and diagonal bolts 311.

[0036] In one possible implementation, see the attached Figure 5 The area where the diagonal brace 30 and the large node plate 21 fit together is provided with a wavy, interlocking superelastic metal energy-absorbing zone 310 on either side, and the friction bolts are also made of a superelastic metal material. Superelastic metals are a class of materials with unique mechanical properties. They can undergo large deformations when subjected to external forces and quickly return to their original shape after the external force is removed, exhibiting excellent elasticity and shape recovery. Typical superelastic metals include nickel-titanium alloys and iron-based alloys (such as Fe-Mn-Si). Specifically, the local areas where the large node plate 21 and the diagonal insert plate 31 contact and squeeze each other are both made of a superelastic metal material, and interlocking protruding and recessed bars are provided between them. The axis of each protruding and recessed bar is perpendicular to the axis of the diagonal brace 30. When the main cylinder 10 is subjected to the wind turbine's gravity and the wind load, these forces are decomposed into forces along the diagonal brace 30 and transmitted to each lattice corner column 20. Because the wind load on the fan is dynamic, the forces acting on each lattice corner column 20 are not uniform. For example, in some cases, the diagonal brace 30 on one side of the fan blade may be subjected to tension, while the diagonal brace 30 behind the fan blade may be subjected to compression.

[0037] In this embodiment, due to the action of the wavy interlocking area, when tension or compression is applied between the diagonal brace 30 and the large gusset plate 21, if the force is relatively small, the two remain fixed to each other. When the force increases to a certain level, slippage and friction would occur if a flat clamping structure were used. However, due to the wavy interlocking effect of this embodiment, slippage is unlikely to occur. If the force continues to increase, the slipping force must first cause the wavy interlocking area to deform or misalign. Once misaligned, the overall thickness will increase, causing the diagonal bolts 311 to stretch and elastically deform. Simply put, when tension or compression is applied between the diagonal brace 30 and the large gusset plate 21 (main cylinder 10 and lattice corner column 20), if the force is relatively small, the two are fixed to each other by the wavy interlocking structure, maintaining structural stability. When the force increases to a certain level, the wavy interlocking effect makes slippage unlikely. If slippage occurs, the wavy interlocking area must first deform or misalign. Deformation or misalignment of the wavy joint consumes energy. Furthermore, any misalignment increases the overall thickness, causing the obliquely inserted bolts 311 to stretch and elastically deform. The elastic deformation of the elastic metal bolts also absorbs some of the energy and increases the clamping force. Once the external load (such as wind) decreases, the elastic action causes the structure to immediately return to its initial stable state.

[0038] The energy absorption effect plays a key role in protecting and stabilizing the structure in this embodiment. The load on the fan due to wind force is dynamic, resulting in uneven forces on each lattice corner column. For example, in extreme cases, the diagonal brace on one side of the fan blade may be subjected to tension, and the diagonal brace on the side behind the fan blade may be subjected to compression. Under such dynamic and uneven force conditions, the wavy interlocking superelastic metal energy absorption zone absorbs energy, reducing the risk of excessive deformation and damage of the structure due to uneven or excessive force, thereby ensuring the overall stability of the structure. At the same time, the energy absorption effect can also buffer and disperse the load, avoid local stress concentration, extend the service life of the structure, and ensure that the structure can operate safely and reliably in complex force environments.

[0039] Among them, a possible implementation of a prestressed lattice tower is as follows: the wind turbine mounting platform and the tower body of the tower are connected via a prefabricated transition section of the prestressed lattice tower described above. The prestressed lattice tower using this prefabricated transition section, with its modular design advantages, can significantly improve construction efficiency and reduce on-site installation difficulty and cost. Furthermore, through the structural optimization design of the transition section (such as innovative structures such as the superelastic metal energy absorption zone), the fatigue resistance and dynamic stability of the tower under complex loads are effectively enhanced, the risk of stress concentration is reduced, the overall service life is extended, and later maintenance and component replacement are facilitated, thereby achieving full lifecycle cost optimization while ensuring structural safety and reliability.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. An assembled transition section of a prestressed lattice tower, characterized by: It comprises a lattice-type corner column (20), a main cylinder (10), a column-column connection structure and a column-cylinder connection structure; The column-column connection structure is connected between adjacent lattice corner columns (20) to form a closed frame, the main cylinder (10) is located inside the frame, and the column-tube connection structure is connected between each lattice corner column (20) and the main cylinder (10); The column-column connection structure and the column-tube connection structure both adopt assembled connection.

2. The prestressed lattice tower assembly transition section according to claim 1, wherein: The column-column connection structure comprises a small node plate (22) and a horizontal rod (40), wherein a small node plate (22) is provided on opposite sides of two adjacent lattice corner columns (20), one side of the small node plate (22) is fixedly connected to the lattice corner column (20), and the other side faces the other lattice corner column (20), and both ends of the horizontal rod (40) are respectively connected to the two small node plates (22).

3. The prestressed lattice tower assembly transition section according to claim 1, wherein: The column-tube connection structure comprises a large node plate (21), an oblique brace (30) and a transverse brace (50); one side of the large node plate (21) is fixedly connected to the lattice corner column (20), and the other side faces the main cylinder (10); a first connection structure and a second connection structure are provided on the main cylinder (10); the oblique brace (30) is obliquely connected between the large node plate (21) and the first connection structure; and the transverse brace (50) is horizontally connected between the large node plate (21) and the second connection structure.

4. The prestressed lattice tower assembly transition section according to claim 3, wherein: The first connection structure is an oblique positioning blind hole provided on the main cylinder (10); the second connection structure is a horizontal positioning hole provided on the main cylinder (10), and the horizontal positioning hole is a blind hole or a through hole.

5. The prestressed lattice tower assembly transition section according to claim 3, wherein: The first connection structure and the second connection structure are welding surfaces respectively provided at the ends of the diagonal brace (30) and the transverse brace (50) and matching the outer shape of the main cylinder (10), and are connected to each other by intersecting line welds.

6. The assembled transition section of a prestressed lattice tower according to any one of claims 2 or 3, characterized in that: The node plate and the lattice corner column (20) are connected by welding.

7. The prefabricated transition section of a prestressed lattice tower according to claim 2, characterized in that: The ends of the horizontal rods (40) are provided with grooves and are inserted into the small node plates (22) for fitting and then connected by welding, and / or, the fitting parts of the horizontal rods (40) and the small node plates (22) are provided with transition clamps and friction bolts through bolt holes for fastening.

8. The prefabricated transition section of a prestressed lattice tower according to claim 3, characterized in that: The ends of the diagonal brace (30) and the transverse brace (50) are provided with grooves and are inserted into the large node plate (21) for fitting and then connected by welding, and / or, the matching parts of the diagonal brace (30) and the transverse brace (50) and the large node plate (21) are provided with transition clamps and friction bolts through bolt holes for fastening.

9. The prefabricated transition section of a prestressed lattice tower according to claim 8, characterized in that: Wave-shaped embedded superelastic metal energy-absorbing areas (310) are respectively provided on both sides of the insertion and matching area of the diagonal brace (30) and the large node plate (21), and the friction-type bolts are also made of superelastic metal material.

10. A prestressed lattice tower, characterized in that: The wind turbine mounting platform of the tower and the tower body are connected by an assembled transition section of a prestressed lattice tower as described in any one of claims 1 to 9.

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