Rock foundation for a wind turbine

Abstract

The utility model relates to a kind of rock foundation fan foundation, rock foundation fan foundation is used to support wind turbine tower, comprising: cushion layer, cushion layer is set in rock foundation pit, cushion layer center is equipped with operation pit;Foundation platform, foundation platform is fixedly set on cushion layer, foundation platform is equipped with connecting portion and annular supporting portion, connecting portion is used to connect and support wind turbine tower, annular supporting portion is set around connecting portion and is integrally arranged with connecting portion;Micro-hole bored pile, micro-hole bored pile is spaced around connecting portion and is distributed on at least three different diameter distribution circles, the upper end of micro-hole bored pile is tightly connected with annular supporting portion and cushion layer, the lower end of micro-hole bored pile is poured and set in rock foundation. Compared with the extended foundation, the foundation construction excavation area is smaller, the camera site arrangement is more flexible, the on-site construction is convenient, and the economy is good.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine foundation technology, specifically to a wind turbine foundation for rock foundations. Background Technology

[0002] Rock foundations have high bearing capacity and compression modulus, so spread foundations are generally used for wind turbine generator sets. However, spread foundations have a larger diameter and burial depth, making excavation difficult. Furthermore, spread foundations rely on the self-weight of the foundation and backfill soil to resist the load from the superstructure, resulting in a larger amount of concrete and steel reinforcement. The larger diameter of spread foundations also places higher demands on land acquisition and platform design, making turbine site layout more challenging. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a rock foundation for a wind turbine, so as to solve the problems of large excavation area and difficulty in arranging the turbine site in the existing foundation construction.

[0004] This utility model is achieved through the following technical solution:

[0005] A rock-based wind turbine foundation, wherein the rock-based wind turbine foundation is used to support the wind turbine tower, comprising:

[0006] A cushion layer is provided in the foundation pit of the rock foundation, and an operating pit is provided at the center of the cushion layer;

[0007] The foundation platform is fixedly installed on the pad layer. The foundation platform is provided with a connecting part and an annular support part. The connecting part is used to connect and support the wind turbine tower. The annular support part is arranged around the connecting part and is integrally formed with the connecting part.

[0008] The micro-hole cast-in-place piles are arranged at intervals around the connecting part and distributed on at least three distribution circles with different diameters. The upper end of the micro-hole cast-in-place piles is fastened to the annular support part and the cushion layer, and the lower end of the micro-hole cast-in-place piles is cast into the rock foundation.

[0009] Furthermore, the diameter of the distribution circle of the micro-hole cast-in-place pile is greater than or equal to two-thirds of the outer diameter of the foundation cap, and less than the outer diameter of the foundation cap.

[0010] Furthermore, the radii of the distribution circles of two adjacent microporous cast-in-place piles differ by 2.5 to 3.5 times the diameter of the microporous cast-in-place pile.

[0011] Furthermore, the microporous cast-in-place piles are evenly spaced on the corresponding distribution circles, and the scale division of the microporous cast-in-place piles on each distribution circle is inversely proportional to the diameter of the corresponding distribution circle.

[0012] Furthermore, the diameter of the microporous cast-in-place pile is 250mm to 350mm.

[0013] Furthermore, the depth to which the micro-hole cast-in-place pile extends into the rock foundation is greater than or equal to one-third of the outer diameter of the foundation cap, and less than one-half of the outer diameter of the foundation cap.

[0014] Furthermore, a connecting plate is pre-embedded in the operating pit, and the connecting plate is arranged around the center of the operating pit. The bottom surface of the foundation platform is provided with a connecting support rod and a lower anchor plate for connecting anchor bolts. The upper end of the connecting support rod passes through the anchor plate, and the lower end of the connecting support rod is used for welding connection with the connecting plate. Two sets of threaded locking parts are screwed onto the connecting support rod, and the threaded locking parts are respectively arranged on the upper and lower sides of the lower anchor plate.

[0015] Furthermore, the lower anchor plate is fixedly connected to a threaded locking member disposed on the upper side of the lower anchor plate.

[0016] Furthermore, the lower end of the connecting support rod is provided with anti-slip texture.

[0017] Furthermore, the threaded locking element is a nut.

[0018] The beneficial effects of this utility model are as follows:

[0019] This wind turbine foundation on rock foundation integrates the foundation cap with the rock foundation using micro-hole cast-in-place piles. This enhances the foundation's resistance to overturning while maintaining its supporting capacity. It achieves the same supporting and anti-overturning capabilities as an extended foundation with smaller foundation dimensions, requiring less excavation area and allowing for more flexible turbine location layout. Micro-hole cast-in-place piles offer convenient and economical on-site construction. The lower anchor plate, connected to the support rod and secured with two sets of threaded locking devices, allows for adjustment of the lower end length of the support rod, facilitating leveling of the lower anchor plate. Simultaneously, the support rod can be welded to the connecting plate, enabling the anchor bolts to connect to the rock foundation via the lower anchor plate and support rod, improving the reliability of the anchor bolt connection to the tower.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a front view of a rock-based wind turbine foundation provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 The top view of the rock-based wind turbine foundation shown;

[0023] Figure 3 for Figure 1 A magnified view of the rock-based wind turbine foundation shown;

[0024] Figure label:

[0025] 1-Foundation pit, 2-Subbase, 3-Foundation cap, 31-Connecting part, 32-Annular support part, 4-Micro-hole cast-in-place pile, 51-Connecting plate, 52-Lower anchor plate, 53-Connecting support rod, 54-Threaded locking part, 61-Distribution circle, 62-Anchor bolt. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0031] Please see Figure 1-3 This utility model provides a technical solution: a rock-based wind turbine foundation for supporting wind turbine towers, comprising: a cushion layer 2, a foundation cap 3, and micro-perforated piles 4. The micro-perforated piles 4 are spaced around the connecting portion 31 and distributed on at least three distribution circles 61 with different diameters. This design improves the wind turbine foundation's anti-overturning capacity while ensuring its supporting capacity. It achieves the same supporting and anti-overturning capacity as an extended foundation with a smaller foundation size, requires less excavation area for foundation construction, allows for more flexible turbine location layout, and is economical.

[0032] Please see Figure 1 and Figure 2Specifically, the cushion layer 2 is set within the foundation pit 1 in the rock foundation, and an operating pit is provided at the center of the cushion layer 2. The foundation cap 3 is fixedly set on the cushion layer 2, and the foundation cap 3 has a connecting part 31 and an annular support part 32. The connecting part 31 is used to connect and support the wind turbine tower. The annular support part 32 is arranged around the connecting part 31 and is integrally set with the connecting part 31. The upper end of the micro-hole cast-in-place pile 4 is tightly connected to the annular support part 32 and the cushion layer 2. The lower end of the micro-hole cast-in-place pile 4 is cast into the rock foundation. The micro-hole cast-in-place pile 4 connects the foundation cap 3 and the rock foundation into one unit, which can improve the overturning resistance of the wind turbine foundation while ensuring the support capacity of the wind turbine foundation. Thus, the same support capacity and overturning resistance of the extended foundation are achieved with a smaller foundation size. In one embodiment, the diameter of the distribution circle 61 of the micro-hole cast-in-place pile 4 is greater than or equal to two-thirds of the outer diameter of the foundation cap 3, and smaller than the outer diameter of the foundation cap 3. Micro-hole cast-in-place piles 4 are distributed in the outer region of the foundation cap 3. The lateral resistance of the micro-hole cast-in-place piles 4 provides a large lever arm to prevent the foundation cap 3 from overturning, thus forming a large resisting moment and improving the stability of the wind turbine foundation. In one embodiment, the radii of the distribution circles 61 of two adjacent micro-hole cast-in-place piles 4 differ by 2.5 to 3.5 times the diameter of the micro-hole cast-in-place piles 4. Preferably, the micro-hole cast-in-place piles 4 are evenly spaced on the corresponding distribution circles 61, and the scale division of the micro-hole cast-in-place piles 4 on each distribution circle 61 is inversely proportional to the diameter of the corresponding distribution circle 61. The micro-hole cast-in-place piles 4 can have an appropriate spacing in the radial direction of the wind turbine foundation, which facilitates the arrangement of more micro-hole cast-in-place piles 4 while ensuring that each micro-hole cast-in-place pile 4 can fully perform its supporting and connecting functions. In one embodiment, the diameter of the micro-hole cast-in-place piles 4 is 250 mm to 350 mm. The depth of the micro-hole cast-in-place pile 4 into the rock foundation is greater than or equal to one-third of the outer diameter of the foundation cap 3, and less than one-half of the outer diameter of the foundation cap 3. Based on the dimensions of the micro-hole cast-in-place pile 4, it can be drilled using a down-the-hole hammer, eliminating the need for rotary drilling rigs or full-casing drilling rigs, thus simplifying construction. Furthermore, down-the-hole hammer drilling is a dry operation, resulting in high lateral and end resistance for the micro-hole cast-in-place pile 4. The smaller pile diameter allows for more piles to be arranged within the same foundation cap, reducing the stress on a single pile and simplifying pile foundation testing. Using micro-hole cast-in-place pile 4 results in a smaller foundation cap workload and significantly improved construction efficiency and economy.

[0033] Please see Figure 1 and Figure 3In one embodiment, a connecting plate 51 is pre-embedded in the operating pit, and the connecting plate 51 is arranged around the center of the operating pit. The bottom surface of the foundation platform 3 is provided with a connecting support rod 53 and a lower anchor plate 52 for connecting the anchor bolt 62. The upper end of the connecting support rod 53 passes through the anchor plate, and the lower end of the connecting support rod 53 is used for welding connection with the connecting plate 51. Two sets of threaded locking parts 54 are screwed onto the connecting support rod 53, and the threaded locking parts 54 are respectively arranged on the upper and lower sides of the lower anchor plate 52. The lower anchor plate 52 can adjust the length of the lower end of the connecting support rod 53 through the connecting support rod 53 and the two sets of threaded locking parts 54 screwed onto it, facilitating the leveling of the lower anchor plate 52. Simultaneously, the connecting support rod 53 can be welded to the connecting plate 51, allowing the anchor bolt 62 to connect to the rock foundation through the lower anchor plate 52 and the connecting support rod 53, improving the reliability of the anchor bolt 62 connecting to the tower. In one embodiment, the lower anchor plate 52 is fixedly connected to the threaded locking parts 54 arranged on the upper side of the lower anchor plate 52. The height of the connecting support rod 53 supporting the lower anchor plate 52 can be adjusted by rotating the connecting support rod 53, making leveling convenient. Adjusting the threaded locking member 54 on the lower side of the lower anchor plate 52 can lock the connecting support rod 53 to the lower anchor plate 52, ensuring stable support. In one embodiment, the lower end of the connecting support rod 53 is provided with anti-slip texture. This makes it easier to rotate the connecting support rod 53 by hand. In one embodiment, the threaded locking member 54 is a nut. It is understood that the threaded locking member 54 can also be a threaded block or a locking nut, or other matching threaded components.

[0034] Working Principle: This rock-based wind turbine foundation uses micro-hole cast-in-place piles 4 to connect the foundation cap 3 to the rock foundation, thus improving the foundation's anti-overturning capacity while ensuring its support capacity. It achieves the same support and anti-overturning capacity as an extended foundation with smaller foundation dimensions, requiring less excavation area and allowing for more flexible turbine location layout. The micro-hole cast-in-place piles 4 are convenient and economical to install on-site. The lower anchor plate 52, connected to the support rod 53 and its two sets of threaded locking parts 54, allows adjustment of the lower end length of the support rod 53, facilitating leveling of the lower anchor plate 52. Simultaneously, the support rod 53 can be welded to the connecting plate 51, enabling the anchor bolt 62 to connect to the rock foundation via the lower anchor plate 52 and the support rod 53, improving the reliability of the anchor bolt 62's connection to the tower.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rock-based wind turbine foundation, wherein the rock-based wind turbine foundation is used to support the tower of a wind turbine unit, characterized in that, include: A cushion layer is provided in the foundation pit of the rock foundation, and an operating pit is provided at the center of the cushion layer; The foundation platform is fixedly installed on the pad layer. The foundation platform is provided with a connecting part and an annular support part. The connecting part is used to connect and support the wind turbine tower. The annular support part is arranged around the connecting part and is integrally formed with the connecting part. The micro-hole cast-in-place piles are arranged at intervals around the connecting part and distributed on at least three distribution circles with different diameters. The upper end of the micro-hole cast-in-place piles is fastened to the annular support part and the cushion layer, and the lower end of the micro-hole cast-in-place piles is cast into the rock foundation.

2. The rock-based wind turbine foundation according to claim 1, characterized in that, The diameter of the distribution circle of the micro-hole cast-in-place pile is greater than or equal to two-thirds of the outer diameter of the foundation cap, but less than the outer diameter of the foundation cap.

3. The rock-based wind turbine foundation according to claim 2, characterized in that, The radii of the distribution circles of two adjacent microporous cast-in-place piles differ by 2.5 to 3.5 times the diameter of the microporous cast-in-place pile.

4. The rock-based wind turbine foundation according to claim 3, characterized in that, The microporous cast-in-place piles are evenly spaced on the corresponding distribution circles, and the scale division of the microporous cast-in-place piles on each distribution circle is inversely proportional to the diameter of the corresponding distribution circle.

5. The rock-based wind turbine foundation according to any one of claims 1 to 4, characterized in that, The diameter of the micro-hole cast-in-place pile is 250mm to 350mm.

6. The rock-based wind turbine foundation according to any one of claims 1 to 4, characterized in that, The depth to which the micro-hole cast-in-place pile extends into the rock foundation is greater than or equal to one-third the outer diameter of the foundation cap, and less than one-half the outer diameter of the foundation cap.

7. The rock-based wind turbine foundation according to claim 1, characterized in that, A connecting plate is pre-embedded in the operating pit, and the connecting plate is arranged around the center of the operating pit. The bottom surface of the foundation platform is provided with a connecting support rod and a lower anchor plate for connecting anchor bolts. The upper end of the connecting support rod passes through the anchor plate, and the lower end of the connecting support rod is used for welding connection with the connecting plate. Two sets of threaded locking parts are screwed on the connecting support rod, and the threaded locking parts are respectively arranged on the upper and lower sides of the lower anchor plate.

8. The rock-based wind turbine foundation according to claim 7, characterized in that, The lower anchor plate is fixedly connected to a threaded locking member located on the upper side of the lower anchor plate.

9. The rock-based wind turbine foundation according to claim 8, characterized in that, The lower end of the connecting support rod is provided with anti-slip texture.

10. The rock-based wind turbine foundation according to claim 7, characterized in that, The threaded locking component is a nut.

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