Foundation structure of a wind turbine and wind turbine

Abstract

The utility model discloses a kind of foundation structure and wind turbine generator set of wind turbine generator set, it is related to wind power generation technical field, wherein, foundation structure includes first bearing platform, second bearing platform, multiple bored piles and multiple anchor rods, the top surface of first bearing platform is connected with the connecting cylinder for connecting the tower cylinder of wind turbine generator set;Second bearing platform is set below first bearing platform, the top surface of second bearing platform projects the bottom surface of first bearing platform and forms step surface, the vertical projection of the bottom surface of first bearing platform in second bearing platform forms core area, the edge of second bearing platform forms the expansion area surrounded in core area;Multiple bored piles are distributed in core area with interval, each bored pile extends downward from the bottom surface of second bearing platform, and bored pile is vertically arranged;Multiple anchor rods are distributed in expansion area with interval, and anchor rod extends downward from the bottom surface of second bearing platform and is arranged with inclination.The foundation structure has good bearing capacity and stability, can guarantee the safety and stability of wind turbine generator set in long-term operation process.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a basic structure for a wind turbine generator set and a wind turbine generator set. Background Technology

[0002] As the installed capacity of wind turbine generators gradually increases, the requirements for wind turbine generator foundations are also gradually increasing. Existing wind turbine generator foundation structures are usually single frame foundations or pile foundations. When the foundation structure is set on geological bodies with poor geological conditions, such as soft soil foundations, the geological body may not be able to provide sufficient bearing capacity, which can easily lead to insufficient bearing capacity of the frame foundation. While pile foundations can meet the bearing capacity requirements, their overturning resistance and pull-out resistance are poor, resulting in insufficient structural stability and making it difficult to ensure the safety and reliability of wind turbine generators during long-term operation. Utility Model Content

[0003] The main purpose of this utility model is to propose a foundation structure for a wind turbine generator set and a wind turbine generator set, aiming to solve the technical problem of insufficient load-bearing capacity and stability of the foundation structure of wind turbine generator sets in the prior art.

[0004] To achieve the above objectives, the foundation structure of the wind turbine generator proposed in this utility model includes a first pier, a second pier, multiple cast-in-place piles, and multiple anchor bolts. The first pier is a frustum-shaped structure with the smaller end facing upwards. A connecting cylinder is connected to the top surface of the first pier, which is used to connect to the tower of the wind turbine generator. The second pier is also a frustum-shaped structure with the smaller end facing upwards. The second pier is located below the first pier and is coaxially arranged with the first pier. The top surface of the second pier extends beyond the bottom surface of the first pier to form a stepped surface. The vertical projection of the bottom surface of the first pier into the second pier forms a core area. The edge of the second pier forms an extension area surrounding the core area. The multiple cast-in-place piles are spaced apart in the core area, each extending downwards from the bottom surface of the second pier and vertically arranged. The multiple anchor bolts are spaced apart in the extension area, each extending downwards from the bottom surface of the second pier and inclined from top to bottom away from the core area.

[0005] In one embodiment, the height of the first support is greater than the height of the second support, and the angle between the sidewall of the second support and the axis of the second support is greater than the angle between the sidewall of the first support and the axis of the first support.

[0006] In one embodiment, the angle between each of the anchor bolts and the axis of the first pier is the same as the angle between the sidewall of the first pier and the axis of the first pier.

[0007] In one embodiment, a plurality of the cast-in-place piles are radially distributed in the core area, and a plurality of the anchor bolts are evenly spaced in a ring in the extension area.

[0008] In one embodiment, a plurality of anchor plates are embedded in the extended area, and the plurality of anchor plates are arranged in a one-to-one correspondence with a plurality of anchor rods, with the top of each anchor rod connected to the corresponding anchor plate.

[0009] In one embodiment, each of the cast-in-place piles is provided with a conical pile tip at its bottom.

[0010] In one embodiment, the sidewall of the connecting cylinder is provided with multiple rows of bolt holes spaced vertically, each row of bolt holes includes multiple bolt holes, and the multiple bolt holes in each row are evenly spaced along the circumference of the connecting cylinder. The connecting cylinder is connected to the tower of the wind turbine generator by high-strength bolts passing through the bolt holes.

[0011] In one embodiment, both the first and second foundations are reinforced concrete structures, and a reinforcing cage is provided inside the first foundation. The bottom of the connecting cylinder is connected to the reinforcing cage inside the first foundation.

[0012] In one embodiment, the first pier and the second pier are integrally cast.

[0013] This utility model also proposes a wind turbine generator set that utilizes the aforementioned basic structure.

[0014] The wind turbine generator foundation structure and the wind turbine generator proposed in this utility model are characterized by a foundation structure in which both the first and second foundations are truncated cones, ensuring uniform stress distribution in all directions and improving the stability of the foundation structure. The top surface area of ​​the first foundation is smaller than its bottom surface area, allowing it to disperse the stress from above and transfer it to the second foundation, preventing stress concentration on the second foundation. Similarly, the top surface area of ​​the second foundation is smaller than its bottom surface area, further dispersing the stress from above and evenly distributing it to the underlying geological mass, preventing uneven settlement due to stress concentration. When the foundation structure is located in soft soil, resulting in insufficient bearing capacity of the geological mass beneath the second foundation, multiple cast-in-place piles and anchor bolts can transfer the stress from the second foundation to deeper, more stable geological masses, ensuring sufficient bearing capacity of the foundation structure. The core area, located in the middle of the second foundation, experiences greater stress, while the extended area at the edge experiences less stress. By installing cast-in-place piles at the bottom of the core area and anchor bolts at the bottom of the extended area, the structural strength of the piles and anchor bolts can be fully utilized, resulting in a more rational stress distribution on the foundation structure. Enlarging the second foundation compared to the first effectively increases the contact area between the foundation structure and the geological body, and lowers the center of gravity, thereby increasing the foundation's resistance to overturning. Each anchor bolt is anchored to the stable geological body below, providing a certain bearing capacity under compression and a certain tensile force under tension, effectively improving the foundation's pull-out resistance, further enhancing its load-bearing capacity and stability, and ensuring the safety and stability of the wind turbine generator during long-term operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an embodiment of the foundation structure of the wind turbine generator set provided by this utility model;

[0017] Figure 2 A side view of an embodiment of the foundation structure of the wind turbine generator set provided by this utility model;

[0018] Figure 3 A bottom view of an embodiment of the foundation structure of the wind turbine generator set provided by this utility model.

[0019] Explanation of icon numbers:

[0020] 10. First pile cap; 11. Connecting cylinder; 12. Bolt hole; 20. Second pile cap; 21. Step surface; 22. Core area; 23. Expansion area; 30. Cast-in-place pile; 31. Pile tip; 40. Anchor rod.

[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] Existing wind turbine foundations typically consist of individual frame foundations or pile foundations. When the foundation is located in geological conditions such as soft soil, the frame foundation may not be able to provide sufficient bearing capacity, leading to insufficient bearing capacity. While pile foundations can meet the bearing capacity requirements, their overturning resistance and pull-out resistance are poor, resulting in insufficient structural stability and making it difficult to ensure the safety and reliability of the wind turbine during long-term operation.

[0026] This utility model proposes a foundation structure for a wind turbine generator set, including a first foundation 10, a second foundation 20, multiple cast-in-place piles 30, and multiple anchor bolts 40. The first foundation 10 is a frustum-shaped structure with the smaller end facing upwards. A connecting cylinder 11 is connected to the top surface of the first foundation 10 for connecting the tower of the wind turbine generator set. The second foundation 20 is also a frustum-shaped structure with the smaller end facing upwards. The second foundation 20 is located below the first foundation 10 and is coaxially arranged with the first foundation 10. The top surface of the second foundation 20 extends beyond the bottom surface of the first foundation 10. A stepped surface 21 is formed. The bottom surface of the first pier 10 is projected vertically into the second pier 20 to form a core area 22. The edge of the second pier 20 forms an extension area 23 surrounding the core area 22. Multiple cast-in-place piles 30 are distributed at intervals in the core area 22. Each cast-in-place pile 30 extends downward from the bottom surface of the second pier 20 and is vertically arranged. Multiple anchor rods 40 are distributed at intervals in the extension area 23. Each anchor rod 40 extends downward from the bottom surface of the second pier 20 and is inclined from top to bottom in a direction away from the core area 22.

[0027] Please see Figure 1 The connecting cylinder 11 is located on top of the first pier 10 and extends upward. The diameter of the connecting cylinder 11 matches the diameter of the wind turbine tower, allowing the tower to extend into and connect with the connecting cylinder 11. The bottom of the tower rests on the top surface of the first pier 10. The second pier 20 is supported below the first pier 10, and the top surface area of ​​the second pier 20 is larger than the bottom surface area of ​​the first pier 10. When the first pier 10 bears the weight of the tower, it can distribute the weight of the tower and transfer it to the second pier 20. The second pier 20 further distributes the force from above. Part of the force is directly transferred to the geological body through the bottom surface of the second pier 20, and the other part of the force is transferred to the stable geological body below through multiple cast-in-place piles 30 and multiple anchor bolts 40 below the second pier 20, so that the second pier 20 is supported by multiple cast-in-place piles 30 and multiple anchor bolts 40. The vertical projection of the bottom surface of the first foundation 10 into the second foundation 20 forms a core area 22. The area of ​​the second foundation 20 extending beyond the bottom surface of the first foundation 10 forms an extension area 23. This allows the core area 22 of the second foundation 20 to bear a larger portion of the load, while the extension area 23 bears a smaller portion. The larger portion of the load is transferred to the stable geological body underground through multiple cast-in-place piles 30, and the smaller portion of the load is transferred to the stable geological body underground through multiple anchor bolts 40, thereby ensuring that the foundation structure provides stable support for the wind turbine generator.

[0028] The foundation structure of the wind turbine generator proposed in this utility model improves the stability of the foundation structure by setting both the first foundation 10 and the second foundation 20 as frustum-shaped, thus ensuring uniform stress distribution in all directions. The top surface area of ​​the first foundation 10 is smaller than its bottom surface area, allowing it to disperse the stress above and transfer it to the second foundation 20, preventing stress concentration. Similarly, the top surface area of ​​the second foundation 20 is smaller than its bottom surface area, further dispersing the stress above and evenly distributing it to the underlying geological mass, preventing uneven settlement due to stress concentration. When the foundation structure is located in soft soil, resulting in insufficient bearing capacity of the geological mass below the second foundation 20, multiple cast-in-place piles 30 and multiple anchor bolts 40 can transfer the stress on the second foundation 20 to deeper, more stable geological masses, ensuring sufficient bearing capacity of the foundation structure. The core area 22, located in the middle of the second foundation 20, experiences greater stress, while the extended area 23, located at the edge of the second foundation 20, experiences less stress. By installing cast-in-place piles 30 at the bottom of the core area 22 and anchor bolts 40 at the bottom of the extended area 23, the structural strength of the cast-in-place piles 30 and anchor bolts 40 can be fully utilized, making the stress distribution of the foundation structure more reasonable. By enlarging the second foundation 20 compared to the first foundation 10, the contact area between the foundation structure and the geological body is effectively increased, and the center of gravity of the foundation structure is lowered, thereby increasing the overturning resistance of the foundation structure. Each anchor bolt 40 is anchored to the stable geological body below, providing a certain bearing capacity when the foundation structure is under compression and a certain tensile force when the foundation structure is under tension, effectively improving the pull-out resistance of the foundation structure, further improving the bearing capacity and stability of the foundation structure, and ensuring the safety and stability of the wind turbine generator during long-term operation.

[0029] In one embodiment, the height of the first support 10 is greater than the height of the second support 20, and the angle between the side wall of the second support 20 and the axis of the second support 20 is greater than the angle between the side wall of the first support 10 and the axis of the first support 10.

[0030] Please see Figure 2The first pier 10 directly bears the weight transmitted from the wind turbine tower. Its greater height improves its compressive strength and stability, allowing it to buffer and initially distribute the stress, preventing excessive localized stress concentration and reducing excessive swaying due to insufficient height. The first pier 10 and the second pier 20 are coaxially arranged. The angle between the sidewall of the second pier 20 and its axis is its inclination angle, and the angle between the sidewall of the first pier 10 and its axis is its inclination angle. The sidewalls of the second foundation 20 have a larger inclination angle than the first foundation 10, allowing the second foundation 20 to cover a wider area when spreading forces in all directions. This effectively increases the contact area between the second foundation 20 and the geological body, enabling it to more effectively and evenly distribute the forces transmitted from the first foundation 10 to the underlying geological body. Simultaneously, it further lowers the center of gravity of the entire foundation structure, enhancing its resistance to overturning.

[0031] In one embodiment, the angle between each anchor bolt 40 and the axis of the first bearing platform 10 is the same as the angle between the side wall of the first bearing platform 10 and the axis of the first bearing platform 10.

[0032] It can be explained that the angle between the anchor rod 40 and the axis of the first foundation 10 is the inclination angle of the anchor rod 40. The inclination angle of each anchor rod 40 is consistent with the inclination angle of the side wall of the first foundation 10, so that the force direction of the anchor rod 40 matches the force distribution direction of the side wall of the first foundation 10. When the side wall of the first foundation 10 transmits the force downward, the anchor rod 40 can further transmit the force to the stable geological body below along the same inclination direction as the side wall of the first foundation 10. When the wind turbine is subjected to external forces such as lateral wind or earthquakes, the side wall of the first foundation 10 may be subjected to upward tension. The anchor rod 40 can provide downward tension along the same inclination direction as the side wall of the first foundation 10, thereby effectively counteracting the upward tension generated by external forces on the foundation structure and enhancing the pull-out resistance of the foundation structure. By keeping the inclination angle of the anchor bolt 40 consistent with the inclination angle of the side wall of the first pier 10, the force transmission path is optimized, enabling the first pier 10 and the anchor bolt 40 to work together better.

[0033] In one embodiment, a plurality of cast-in-place piles 30 are radially distributed in the core area 22, and a plurality of anchor bolts 40 are evenly spaced in a ring in the extension area 23.

[0034] Please see Figure 3Because the connecting cylinder 11, the first foundation 10, and the second foundation 20 are coaxially arranged, the stress on the second foundation 20 gradually decreases from the center to the edge. By arranging multiple cast-in-place piles 30 radially from the bottom surface of the second foundation 20 towards the edge, the distribution density of the cast-in-place piles 30 matches the stress distribution of the second foundation 20, resulting in a more rational structural design. This fully utilizes the structural performance of the materials and improves the bearing capacity of the foundation structure. Furthermore, multiple anchor rods 40 are arranged in a ring-shaped interval, and these anchor rods 40 are also radially distributed relative to the multiple cast-in-place piles 30 from the bottom surface of the second foundation 20 towards the edge. This ensures that the stress on the second foundation 20 is evenly transmitted to the underlying geological body along the radial direction, making the stress on the underlying geological body more uniform, avoiding local stress concentration, and thus improving the stability of the foundation structure.

[0035] In one embodiment, multiple anchor plates are embedded in the expansion area 23, and the multiple anchor plates are arranged in a one-to-one correspondence with multiple anchor rods 40, with the top of each anchor rod 40 connected to the corresponding anchor plate.

[0036] It should be noted that by setting multiple anchor plates within the extension zone 23 and connecting the top of the anchor rod 40 to the corresponding anchor plates, the connection strength between the anchor rod 40 and the second bearing platform 20 is significantly enhanced. Furthermore, when the anchor rod 40 is under stress, the anchor plates can evenly transmit the stress to the second bearing platform 20, ensuring the connection stability between the anchor rod 40 and the second bearing platform 20. It can be stated that the anchor plates are those used in existing technologies.

[0037] In one embodiment, each cast-in-place pile 30 has a conical pile tip 31 at its bottom.

[0038] Understandably, by setting a conical pile tip 31, the cast-in-place pile 30 can penetrate the stratum more smoothly during construction, reducing stratum resistance and improving construction efficiency.

[0039] In one embodiment, the side wall of the connecting cylinder 11 is provided with multiple rows of bolt holes 12 spaced vertically. Each row of bolt holes 12 includes multiple bolt holes 12, and the multiple bolt holes 12 in each row are evenly spaced along the circumference of the connecting cylinder 11. The connecting cylinder 11 is connected to the tower of the wind turbine generator by high-strength bolts passing through the bolt holes 12.

[0040] It should be noted that multiple sets of bolt holes 12 are arranged vertically at intervals to provide multiple vertical connection points. High-strength bolts are horizontally inserted between the bolt holes 12 and the tower, providing a stable connection between the connecting cylinder 11 and the tower, limiting the vertical displacement of the tower relative to the connecting cylinder 11, so that the connecting cylinder 11 provides lateral support to the tower, effectively improving the lateral force performance of the tower. The bolt holes 12 in each layer are evenly distributed circumferentially to ensure the uniform transmission of connection force in the circumferential direction.

[0041] In one embodiment, both the first foundation 10 and the second foundation 20 are reinforced concrete structures. A steel cage is installed inside the first foundation 10, and the bottom of the connecting cylinder 11 is connected to the steel cage inside the first foundation 10.

[0042] Furthermore, the bottom of the connecting cylinder 11 is connected to the first bearing platform 10, and the top of the connecting cylinder 11 extends upward toward the first bearing platform 10. By extending the bottom of the connecting cylinder 11 into the first bearing platform 10 and connecting it with the reinforcing cage of the first bearing platform 10, a stable connection between the connecting cylinder 11 and the first bearing platform 10 is achieved, so that the connecting cylinder 11 and the first bearing platform 10 are connected as an integral load-bearing structure, and the lateral force of the connecting cylinder 11 can be transmitted to the interior of the first bearing platform 10 through the reinforcing cage, thereby improving the overall stability of the foundation structure.

[0043] In one embodiment, the first foundation 10 and the second foundation 20 are integrally cast.

[0044] It is understandable that both the first foundation 10 and the second foundation 20 are reinforced concrete structures, and the steel cages inside the first foundation 10 and the second foundation 20 are interconnected. The first foundation 10 and the second foundation 20 are cast together, which makes the force transfer between the first foundation 10 and the second foundation 20 more direct, effectively avoiding stress phenomena at the connection between the first foundation 10 and the second foundation 20, thereby improving the overall bearing capacity and stability of the foundation structure.

[0045] This utility model also proposes a wind turbine generator set, which utilizes the aforementioned foundation structure. The specific structure of this foundation structure is described in the above embodiments. Since this wind turbine generator set adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. The foundation structure is connected to the tower of the wind turbine generator set, and the foundation structure can provide sufficient load-bearing capacity to the tower, maintaining the safety and stability of the wind turbine generator set during long-term operation.

[0046] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A foundation structure for a wind turbine generator set, characterized in that, include: The first support platform is a frustum-shaped structure with the smaller end facing upwards. A connecting cylinder is connected to the top surface of the first support platform, and the connecting cylinder is used to connect to the tower of the wind turbine generator set. The second support platform is a frustum-shaped platform with the smaller end facing upward. The second support platform is located below the first support platform and is coaxial with the first support platform. The top surface of the second support platform extends beyond the bottom surface of the first support platform to form a stepped surface. The vertical projection of the bottom surface of the first support platform into the second support platform forms a core area. The edge of the second support platform forms an extension area surrounding the core area. Multiple cast-in-place piles are spaced apart in the core area, each cast-in-place pile extends downward from the bottom surface of the second pile cap, and each cast-in-place pile is arranged vertically; Multiple anchor bolts are spaced apart in the extended area. Each anchor bolt extends downward from the bottom surface of the second pier and is inclined from top to bottom in a direction away from the core area.

2. The foundation structure of the wind turbine generator set as described in claim 1, characterized in that, The height of the first foundation is greater than the height of the second foundation, and the angle between the side wall of the second foundation and the axis of the second foundation is greater than the angle between the side wall of the first foundation and the axis of the first foundation.

3. The foundation structure of the wind turbine generator set as described in claim 1, characterized in that, The angle between each anchor rod and the axis of the first bearing platform is the same as the angle between the side wall of the first bearing platform and the axis of the first bearing platform.

4. The foundation structure of the wind turbine generator set as described in claim 1, characterized in that, Multiple cast-in-place piles are radially distributed in the core area, and multiple anchor bolts are evenly spaced in a ring in the extension area.

5. The foundation structure of the wind turbine generator set as described in claim 4, characterized in that, Multiple anchor plates are embedded in the extended area, and each anchor plate is correspondingly set with a corresponding anchor rod. The top of each anchor rod is connected to the corresponding anchor plate.

6. The foundation structure of the wind turbine generator set as described in any one of claims 1 to 5, characterized in that, Each of the aforementioned cast-in-place piles has a conical pile tip at its bottom.

7. The foundation structure of the wind turbine generator set as described in any one of claims 1 to 5, characterized in that, The side wall of the connecting cylinder is provided with multiple rows of bolt holes spaced vertically. Each row of bolt holes includes multiple bolt holes, and the multiple bolt holes in each row are evenly spaced along the circumference of the connecting cylinder. The connecting cylinder is connected to the tower of the wind turbine generator by high-strength bolts passing through the bolt holes.

8. The foundation structure of the wind turbine generator set as described in any one of claims 1 to 5, characterized in that, Both the first and second foundations are reinforced concrete structures. A reinforcing cage is installed inside the first foundation, and the bottom of the connecting cylinder is connected to the reinforcing cage inside the first foundation.

9. The foundation structure of the wind turbine generator set as described in claim 8, characterized in that, The first and second foundations are cast as a single unit.

10. A wind turbine generator set, characterized in that, The application has the infrastructure as described in any one of claims 1 to 9.

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