Elevated tower foundation, precast module and wind tower

Abstract

The application discloses a raised tower drum foundation and a prefabricated module wind power tower drum, and the raised tower drum foundation comprises a bearing platform and a plurality of pile foundations, the bearing platform is arranged above a ground surface and abuts against the ground surface, the pile foundations are connected with the bottom of the bearing platform and extend downwards to the ground surface, the bearing platform is arranged above the ground surface and the pile foundations are inserted into the soil, and the load bearing capacity of the bearing platform is greatly improved due to the arrangement of the pile foundations. The bearing platform comprises a bottom ring beam, a top ring beam and a plurality of inclined columns, the arrangement of the inclined columns helps to share the load of the tower drum body transmitted downwards to the tower drum foundation, the load bearing capacity of the tower drum foundation is further improved, the structural strength of the raised tower drum foundation is enhanced, and due to the certain height of the bearing platform, the overall height of the wind power tower drum can be improved to a certain extent, so that the wind turbine can utilize stronger wind energy at a higher position, and the power generation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wind power foundations, and in particular to a raised tower foundation, a prefabricated module of the raised tower foundation, and a wind power tower. Background Technology

[0002] Wind power generation refers to converting the kinetic energy of wind into electrical energy. Wind power is a clean and pollution-free renewable energy source. Wind farms have high power generation capacity, stable turbine operation, and mature manufacturing technology, and have been widely used in recent years. Wind turbine towers are tall structures, generally quite high, and bear significant horizontal and vertical loads. The foundation, located at the bottom of the wind turbine tower, bears the enormous loads transmitted from the upper tower body and the wind turbine, and is a crucial component ensuring the safety and normal operation of the wind turbine unit. Furthermore, with the research and application of ultra-high towers, even higher requirements have been placed on the structural strength of the tower foundation. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a high-strength elevated tower foundation, and a prefabricated module for such an elevated tower foundation.

[0004] Embodiments of the present invention also propose a wind turbine tower having the above-mentioned raised tower foundation.

[0005] The raised tower foundation of this invention includes a pile cap and a plurality of pile foundations. The pile cap is conical and is positioned above and abuts the ground plane. The pile foundations are connected to the bottom of the pile cap and extend below the ground plane. At least a portion of the pile foundations are spaced apart along the circumference of the pile cap. The pile cap includes a bottom ring beam, a top ring beam, and a plurality of inclined columns. The bottom ring beam is located below the top ring beam. The plurality of inclined columns are spaced apart along the circumference. The top of the inclined column is connected to the top ring beam, and the bottom of the inclined column is connected to the bottom ring beam. The top of the inclined column is located inside the bottom ring beam.

[0006] The elevated tower foundation provided in this embodiment of the invention includes a pile cap located above the ground and pile foundations inserted into the soil. The pile foundation significantly improves the load-bearing capacity of the pile cap. The inclined columns in the pile cap help to distribute the load transmitted downward from the tower body to the tower foundation, further improving the load-bearing capacity of the tower foundation and enhancing the structural strength of the elevated tower foundation. Furthermore, since the pile cap has a certain height, it can increase the overall height of the wind turbine tower to a certain extent, enabling the wind turbine to utilize higher and stronger wind energy, thus helping to improve power generation efficiency.

[0007] In some embodiments, the projection of the top ring beam along the vertical direction onto the ground plane is located inside the projection of the bottom ring beam along the vertical direction onto the ground plane.

[0008] In some embodiments, the bottom ring beam includes a plurality of support portions and a plurality of connecting beams, the support portions extending in the inward and outward directions, and the plurality of support portions and the plurality of connecting beams being alternately arranged and sequentially connected in the circumferential direction.

[0009] In some embodiments, the support is connected to at least two pile foundations spaced apart in the inward and outward directions.

[0010] In some embodiments, the inclined column is connected to the middle of the support portion, a portion of the support portion is located on the outside of the inclined column, and another portion of the support portion is located on the inside of the inclined column.

[0011] In some embodiments, the raised tower foundation further includes several cover plates connected to two adjacent inclined columns, and at least one of the cover plates has a doorway.

[0012] Another embodiment of the present invention provides a prefabricated module for an elevated tower foundation. Multiple prefabricated modules are sequentially spliced ​​in the circumferential direction to form the elevated tower foundation described in any of the above embodiments. The prefabricated module includes a bottom beam prefabricated component, a top beam prefabricated component, at least one inclined column, and at least one pile foundation. The top of the inclined column is connected to the top beam prefabricated component, the bottom of the inclined column is connected to the bottom beam prefabricated component, and the pile foundation is connected to the bottom end of the bottom beam prefabricated component and extends downward.

[0013] Another embodiment of the present invention provides a wind turbine tower comprising: an elevated tower foundation; and a tower body, wherein the tower body is disposed on top of the elevated tower foundation and connected to the top ring beam.

[0014] In some embodiments, the inclined column is connected to the outer side of the top ring beam, the top ring beam is provided with prestressing ducts for anchoring prestressing tendons, and / or, the top ring beam is provided with anchor bolt holes for anchoring the tower body.

[0015] In some embodiments, the wind turbine tower further includes prestressed tendons, which prestress the tower body and are anchored at their bottom ends to the top ring beam.

[0016] In some embodiments, the prestressing tendon is an internal prestressing tendon or an external prestressing tendon. Attached Figure Description

[0017] Figure 1 This is a top view of the raised tower foundation provided in Embodiment 1 of the present invention.

[0018] Figure 2 This is a cross-sectional view of the raised tower foundation provided in Embodiment 1 of the present invention.

[0019] Figure 3 This is a top view of the raised tower foundation provided in Embodiment 2 of the present invention.

[0020] Figure 4 This is a cross-sectional view of the raised tower foundation provided in Embodiment 2 of the present invention.

[0021] Figure 5 This is a top view of the raised tower foundation provided in Embodiment 3 of the present invention.

[0022] Figure 6 This is a cross-sectional view of the raised tower foundation provided in Embodiment 3 of the present invention. Reference numerals:

[0023] Wind turbine tower 100, raised tower foundation 1, pile cap 11, bottom ring beam 111, support part 1111, connecting beam 1112, top ring beam 112, inclined column 113, pile foundation 12, cover plate 13, doorway 131, tower body 2, ground plane 3, prestressed tendons 4, anchor bolts 5, connecting plate 51. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following is based on Figures 1-6 This invention describes a wind turbine tower 100 and a raised tower foundation 1 provided in an embodiment of the invention. The wind turbine tower 100 includes a raised tower foundation 1 and a tower body 2. The tower body 2 is located on top of the raised tower foundation 1 and connected to the top of the raised tower foundation 1. The raised tower foundation 1 serves as the foundation of the wind turbine tower, supporting the tower body 2.

[0026] The raised tower foundation 1 includes a pile cap 11 and a plurality of pile foundations 12. The pile cap 11 is conical in shape, positioned above and abutting against the ground plane 3, with its central axis perpendicular to the ground plane 3. The tops of the pile foundations 12 are connected to the bottoms of the pile cap 11 and extend below the ground plane 3, with at least a portion of the pile foundations 12 spaced circumferentially along the pile cap 11. That is, the pile foundations 12 are connected to the pile cap 11 and inserted into the soil, which significantly increases the load-bearing capacity of the pile cap 11 and improves the structural strength of the raised tower foundation 1. In some embodiments, all pile foundations 12 are spaced circumferentially along the pile cap 11; in other embodiments, a portion of the pile foundations 12 are spaced circumferentially along the pile cap 11, and a portion of the pile foundations 12 may be spaced circumferentially along the inward and outward directions (directions away from and towards the central axis of the pile cap 11).

[0027] Specifically, the foundation 11 includes a bottom ring beam 111, a top ring beam 112, and several inclined columns 113, with the bottom ring beam 111 located below the top ring beam 112. The inclined columns 113 are spaced apart circumferentially along the foundation 11, and their extension directions form an angle with the central axis of the foundation 11. The top of each inclined column 113 is connected to the top ring beam 112, and the bottom of each inclined column 113 is connected to the bottom ring beam 111. The top of each inclined column 113 is located inside its bottom. That is, the top of each inclined column 113 is closer to the central axis of the foundation 11 than its bottom. The inclined columns 113 have an overall downward and outward extending structure.

[0028] The elevated tower foundation provided in this embodiment of the invention includes a pile cap located above the ground and pile foundations inserted into the soil. The pile foundation significantly improves the load-bearing capacity of the pile cap. The inclined columns in the pile cap help to distribute the load transmitted downward from the tower body to the tower foundation, further improving the load-bearing capacity of the tower foundation and enhancing the structural strength of the elevated tower foundation. Furthermore, since the pile cap has a certain height, it can increase the overall height of the wind turbine tower to a certain extent, enabling the wind turbine to utilize higher and stronger wind energy, thus helping to improve power generation efficiency.

[0029] In some embodiments, such as Figure 1 , 3 and Figure 5 As shown, the central axes of the top ring beam 112 and the bottom ring beam 111 coincide, and both extend vertically. The projection of the top ring beam 112 in the vertical direction onto the ground plane 3 is located inside the projection of the bottom ring beam 111 in the vertical direction onto the ground plane 3, that is, the size of the top ring beam 112 is smaller than the size of the bottom ring beam 111.

[0030] Specifically, such as Figure 1 , 3 and Figure 5As shown, the outer edge of the projection of the top ring beam 112 along the vertical direction onto the ground plane 3 is located inside the outer edge of the projection of the bottom ring beam 111 along the vertical direction onto the ground plane 3, meaning the maximum size of the former is smaller than the maximum size of the latter. Furthermore, the outer edge of the projection of the top ring beam 112 along the vertical direction onto the ground plane 3 is located inside the inner edge of the projection of the bottom ring beam 111 along the vertical direction onto the ground plane 3, meaning the maximum size of the former is smaller than the maximum size of the latter.

[0031] Furthermore, such as Figure 1 , 3 and Figure 5 As shown, the bottom ring beam 111 includes several support portions 1111 and several connecting beams 1112. The support portions 1111 extend in the inward and outward directions, and the support portions 1111 and the connecting beams 1112 are alternately arranged and sequentially connected in the circumferential direction of the bottom ring beam 111. The connecting beams 1112 serve to connect two adjacent support portions 1111. Since the support portions 1111 extend in the inward and outward directions, their inner ends are close to the central axis of the bottom ring beam 111, and their outer ends are far from the central axis of the bottom ring beam 111. One end of the connecting beam 1112 is connected to the side of one of the support portions 1111, and the other end is connected to the side of another support portion 1111. The support portions 1111 mainly serve a supporting function.

[0032] The bottom end face of the bottom ring beam 111 abuts against the ground plane 3. In some embodiments, such as Figure 2 , 4 As shown in Figure 6, the bottom end face of the support part 1111 is flush with the bottom end face of the connecting beam 1112, and both abut against the ground plane 3. The setting of the support part 1111 increases the contact area between the bottom ring beam 111 and the ground plane 3, and improves the radial load-bearing capacity of the raised tower foundation 1.

[0033] Furthermore, the support portion 1111 also serves to connect the pile foundations 12, that is, the top of the pile foundations 12 is connected to the bottom end face of the support portion 1111. To further improve the structural strength and stiffness of the raised tower foundation 1, a portion of the pile foundations 12 are spaced apart in the inward and outward directions, meaning the pile foundations 12 can be configured as multiple layers in the inward and outward directions, thereby enhancing the radial load-bearing capacity of the raised tower foundation 1. The support portion 1111 is connected to at least two pile foundations 12 arranged at intervals in the inward and outward directions.

[0034] exist Figure 2 , 4In the embodiments shown in Figure 6, each support 1111 is connected to two pile foundations 12 spaced apart in the inward and outward directions. That is, in these embodiments, the pile foundations 12 are divided into two groups, each group comprising the same number of pile foundations 12 as the support 1111. The pile foundations 12 in each group are spaced apart in the circumferential direction, and the two groups are spaced apart in the inward and outward directions. Of course, in other embodiments, the support 1111 can also be connected to three or more pile foundations 12 spaced apart in the inward and outward directions. Furthermore, different support 1111s can be connected to different numbers of pile foundations 12; for example, a support 1111 can be connected to two pile foundations 12, or it can be connected to three pile foundations 12.

[0035] In some embodiments, the inclined column 113 is connected to the middle portion of the support portion 1111, with a portion of the support portion 1111 located on the outer side of the inclined column 113 and another portion of the support portion 1111 located on the inner side of the inclined column 113. For example... Figure 2 , 4 As shown in Figure 6, the bottom of the inclined column 113 is connected to the middle of the top surface of the support part 1111, thereby making the structure of the raised tower foundation 1 more stable. When the load is transmitted downward through the inclined column 113, the support part 1111 can play a stronger supporting role, improving the structural strength and rigidity of the tower foundation.

[0036] Furthermore, such as Figure 2 As shown, the dimension at the position where the bottom of the inclined column 113 (connected to the support portion 1111) is larger than that at other positions, thereby making the connection between the inclined column 113 and the support portion 1111 more stable.

[0037] Optionally, the angle between the inclined column 113 and the ground plane 3 is 50°-70°.

[0038] Preferably, such as Figure 2 , 4 As shown in Figure 6, the angle between the inclined column 113 and the ground plane 3 is 60°.

[0039] In some embodiments, such as Figure 1 , 3As shown in Figure 5, due to the spacing between the inclined columns 113, to prevent debris from entering the raised tower foundation 1 above the ground plane 3, the raised tower foundation 1 also includes several cover plates 13. Each cover plate 13 is connected to two adjacent inclined columns 113, and at least one cover plate 13 has a doorway 131. That is, the cover plate 13 covers the gap between two adjacent inclined columns 113, thereby isolating the space defined inside the foundation 11 from the outside. For ease of maintenance, the cover plate 13 has a doorway 131 for workers and equipment to enter and exit, and the doorway 131 is located near the bottom of the cover plate 13. It is understood that the cover plate 13 is inclined to adapt to the structure of the inclined columns 113.

[0040] The top ring beam 112 is connected to the bottom of the tower body 2. For example... Figures 1-6 As shown, the inclined column 113 is connected to the outer side of the top ring beam 112, so that the top ring beam 112 protrudes inward relative to the inclined column 113.

[0041] In some embodiments, the wind turbine tower 100 further includes prestressing tendons 4, which are used to prestress the tower body 2, and the top ring beam 112 also serves to anchor the prestressing tendons 4 of the wind turbine tower 100.

[0042] As an example, in Figures 1-4 In the illustrated embodiment, the top ring beam 112 is provided with prestressing ducts for anchoring the prestressing tendons 4. The prestressing tendons 4 pass downward through the prestressing ducts on the top ring beam 112 and are anchored to the bottom end of the top ring beam 112. Furthermore, there are multiple prestressing ducts, which are spaced apart circumferentially on the top ring beam 112.

[0043] Specifically, in Figure 1 and Figure 2 In the first embodiment shown, the prestressing tendon 4 is an external prestressing tendon, that is, the tower body 2 is externally prestressed using the prestressing tendon 23, and the prestressing tendon 4 is located on the inner side of the tower body 2. Figure 3 and Figure 4 In the second embodiment shown, the prestressing tendon 4 is an internal prestressing tendon, that is, the prestressing tendon 4 can be used to perform internal prestressing tensioning on the tower body 2, and the prestressing tendon 4 is inserted into the wall of the tower body 2.

[0044] exist Figure 5 and Figure 6 In the illustrated embodiment three, the top ring beam 112 is provided with anchor bolt holes for anchoring the tower body 2. The bottom end of the tower body 2 is provided with a connecting plate 51. Anchor bolts 5 pass through the connecting plate 51 and the anchor bolt holes of the top ring beam 112 in sequence and are then anchored, thereby connecting the tower body 2 to the top ring beam 112. Figure 5 and Figure 6In the illustrated embodiment, the connecting plate 51 is a T-shaped plate with two rows of anchor bolt holes. One row of anchor bolt holes is located on the inner side of the tower body 2 in the inward and outward direction, and the other row of anchor bolt holes is located on the outer side of the tower body 2 in the inward and outward direction. The tower body 2 and the top ring beam 112 are anchored by the two rows of anchor bolts 5, which improves the reliability of the connection and enhances the structural strength and rigidity of the wind turbine tower 100.

[0045] Of course, in some embodiments, the top ring beam 112 may be provided with prestressed ducts or anchor bolt holes.

[0046] This invention also proposes a prefabricated module for an elevated tower foundation 1. Multiple prefabricated modules are sequentially assembled circumferentially to form the elevated tower foundation 1 described in any of the above embodiments. Each prefabricated module includes a bottom beam prefabricated component, a top beam prefabricated component, at least one inclined column 113, and at least one pile foundation 12. The top of the inclined column 113 is connected to the top beam prefabricated component, and the bottom of the inclined column 113 is connected to the bottom beam prefabricated component. The pile foundation 12 is connected to the bottom end of the bottom beam prefabricated component and extends downwards. In other words, by first preparing multiple prefabricated modules, the modules are transported to the site for assembly to complete the elevated tower foundation 1, significantly reducing transportation costs and manufacturing difficulty.

[0047] The prefabricated bottom beam components of the prefabricated modules are connected end-to-end to form a bottom ring beam 111, and the prefabricated top beam components of the prefabricated modules are connected end-to-end to form a top ring beam 112. The number of prefabricated modules used to assemble the raised tower foundation 1 can be set according to site requirements, and this invention does not limit this.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A raised tower foundation, characterized in that, It includes a pile cap and several pile foundations. The pile cap is conical and is positioned above and abuts the ground plane. The pile foundations are connected to the bottom of the pile cap and extend below the ground plane. At least some of the pile foundations are spaced apart along the circumference of the pile cap. The support platform includes a bottom ring beam, a top ring beam, and several inclined columns. The bottom ring beam is located below the top ring beam. The several inclined columns are spaced apart along the circumference. The top of the inclined column is connected to the top ring beam, and the bottom of the inclined column is connected to the bottom ring beam. The top of the inclined column is located inside the bottom ring beam. The bottom ring beam includes several supporting parts and several connecting beams. The supporting parts extend in the inward and outward directions, and the connecting beams extend in the circumferential direction of the bottom ring beam. The several supporting parts and the several connecting beams are alternately arranged and connected in sequence in the circumferential direction. The inclined column and the connecting beam are both connected to the middle of the supporting part. A part of the supporting part is located on the outside of the inclined column, and another part of the supporting part is located on the inside of the inclined column. The pile foundation is connected to the bottom of the support, and the support is connected to at least two pile foundations that are spaced apart in the inward and outward directions. A portion of the support located outside the inclined column and another portion located inside the inclined column are respectively connected to the pile foundations. In the inward and outward directions, the end of the support near the top ring beam is spaced apart from the top ring beam.

2. The raised tower foundation according to claim 1, characterized in that, The projection of the top ring beam along the vertical direction onto the ground plane is located inside the projection of the bottom ring beam along the vertical direction onto the ground plane.

3. The raised tower foundation according to claim 1 or 2, characterized in that, It also includes several cover plates, which are connected to two adjacent inclined columns, and at least one of the cover plates has a door opening.

4. A prefabricated module for an elevated tower foundation, characterized in that, Multiple prefabricated modules are sequentially assembled in the circumferential direction to form an elevated tower foundation according to any one of claims 1-3. Each prefabricated module includes a bottom beam prefabricated component, a top beam prefabricated component, at least one inclined column, and at least one pile foundation. The top of the inclined column is connected to the top beam prefabricated component, the bottom of the inclined column is connected to the bottom beam prefabricated component, and the pile foundation is connected to the bottom end of the bottom beam prefabricated component and extends downward.

5. A wind turbine tower, characterized in that, include: Elevated tower foundation, wherein the elevated tower foundation is the elevated tower foundation according to any one of claims 1-3; The tower body is located on top of the raised tower foundation and connected to the top ring beam.

6. The wind turbine tower according to claim 5, characterized in that, The inclined column is connected to the outer side of the top ring beam, the top ring beam is provided with prestressing ducts for anchoring prestressing tendons, and / or, the top ring beam is provided with anchor bolt holes for anchoring the tower body.

7. The wind turbine tower according to claim 5 or 6, characterized in that, It also includes prestressing tendons, which prestress the tower body and whose bottom ends are anchored to the top ring beam.

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