A wind turbine tower foundation and a wind turbine

Abstract

This utility model belongs to the technical field of wind turbine generator sets, and proposes a wind turbine generator set tower foundation and a wind turbine generator set. An axial buffer assembly is provided between the upper and lower concrete blocks. An annular groove is formed on the side wall of the lower concrete block. One end of the outer base concrete block is sleeved with the side wall of the annular groove, and the other end of the outer base concrete block extends to be flush with the upper surface of the upper concrete block. The side wall of the upper concrete block is sleeved with the inner annular side wall of the circumferential buffer assembly, and the outer annular side wall of the circumferential buffer assembly is sleeved with the inner annular side wall of the outer base concrete block. The wind turbine generator set tower foundation of this utility model forms an inner cavity for receiving the upper concrete block through the lower and outer base concrete blocks. The axial and circumferential buffer assemblies achieve soft connections between the upper concrete block and the lower and outer base concrete blocks respectively, thereby relieving the axial and circumferential forces on the upper concrete block.

Description

Technical Field

[0001] This utility model belongs to the technical field of wind turbine generator sets, and specifically relates to a wind turbine generator set tower foundation and a wind turbine generator set. Background Technology

[0002] Wind power, as a clean and renewable energy source, has seen rapid development globally in recent years. A wind turbine typically consists of a tower, blades, nacelle, and foundation. The tower foundation is the key load-bearing structure of the entire wind turbine, and its design and performance directly affect the turbine's operational stability and service life.

[0003] Existing wind turbine tower foundations mostly adopt monolithic concrete casting structures or reinforced concrete pile foundation structures. Although these foundations can provide high load-bearing capacity, their vibration resistance is limited. During operation, wind turbines are subjected to wind loads, seismic forces, and periodic impacts from turbine start-up and shutdown. Traditional rigid foundations lack effective buffer structures, making it difficult to absorb and disperse vibration energy, which can easily lead to resonance or fatigue damage in the tower. Furthermore, monolithic casting foundations are often bulky, requiring large amounts of steel reinforcement and concrete materials, resulting in long construction periods and complex construction processes, which are not conducive to rapid installation and subsequent maintenance.

[0004] In view of the above problems, there is an urgent need for a new type of wind turbine tower foundation structure that can ensure load-bearing capacity while having good vibration reduction and buffering performance, so as to improve the overall stability and reliability and extend the service life of the unit. Utility Model Content

[0005] To address the aforementioned issues, this utility model proposes a wind turbine tower foundation, comprising: an upper concrete block, a lower concrete block, an outer foundation concrete block, an axial buffer assembly, and a circumferential buffer assembly. The upper and lower concrete blocks are arranged coaxially in a vertical position. The upper surface area of ​​the upper concrete block is smaller than the lower surface area of ​​the upper concrete block. An axial buffer assembly is provided between the upper and lower concrete blocks. The two ends of the axial buffer assembly are respectively connected to the lower surface of the upper concrete block and the upper surface of the lower concrete block. A ring groove is opened on the side wall of the lower concrete block. One end of the outer base concrete block is sleeved with the side wall of the ring groove. The other end of the outer base concrete block extends to the side of the upper concrete block until it is flush with the upper end face of the upper concrete block. The side wall of the upper concrete block is sleeved with the inner ring side wall of the circumferential buffer assembly. The outer ring side wall of the circumferential buffer assembly is sleeved with the inner ring side wall of the outer base concrete block.

[0006] Furthermore, the sidewalls of the upper concrete block include inclined sidewalls and vertical sidewalls that are joined together vertically. The vertical sidewalls are connected to the circumferential buffer assembly, and the inclined sidewalls form an acute angle with the lower end face of the upper concrete block.

[0007] Furthermore, the radius of the upper end face of the upper concrete block is one-fifth to one-quarter of the radius of the lower end face of the upper concrete block, and the inclined sidewall forms an angle of 22° to 28° with the lower end face of the upper concrete block.

[0008] Furthermore, the axial buffer assembly includes several coaxially arranged buffer rings with progressively increasing radii, and the radius difference between adjacent buffer rings is 25cm to 30cm.

[0009] Furthermore, the buffer ring includes several axial buffers arranged in a circular array about the axis of the upper concrete block, and the included angle between the centers of adjacent axial buffers in the same buffer ring about the axis of the upper concrete block is 24° to 26°.

[0010] Furthermore, the circumferential buffer assembly includes two circumferential buffer rings arranged vertically, with the upper circumferential buffer ring having its connection surface with the vertical sidewall adjacent to the inclined sidewall, and the lower circumferential buffer ring having its connection surface with the vertical sidewall adjacent to the lower end face of the upper concrete block.

[0011] Furthermore, the two circumferential buffer rings maintain a predetermined spacing in the axial direction, and the circumferential buffer rings include a number of circumferential buffers arranged in a circular array about the axis of the upper concrete block.

[0012] Furthermore, the upper end face of the lower concrete block is provided with several second base grooves corresponding to several axial buffers, and the lower end face of the upper concrete block is provided with several first base grooves corresponding to several axial buffers. The two ends of the axial buffers are inserted into the corresponding second base grooves and first base grooves.

[0013] Furthermore, the axial length of the lower concrete block is 1.3 to 1.6 times that of the upper concrete block, and the axial length of the outer foundation concrete block is 1.8 to 2 times that of the upper concrete block; The radius of the lower concrete block is 1.3 to 1.6 times that of the upper concrete block.

[0014] A wind turbine generator set is also disclosed, including a wind turbine generator set tower foundation as described above.

[0015] Compared with the prior art, the embodiments of this utility model have at least the following advantages: This utility model relates to a wind turbine tower foundation. One end of the outer base concrete block is flush with the upper surface of the upper concrete block, while the other end of the outer base concrete block forms a rigid connection with the lower concrete block. The lower concrete block provides vertical support to the outer base concrete block. The lower and outer base concrete blocks form an inner cavity to accommodate the upper concrete block. Axial and circumferential buffer components provide soft connections between the upper concrete block and the lower and outer base concrete blocks, respectively, to alleviate axial and circumferential forces on the upper concrete block. Simultaneously, the upper concrete block adopts a structural design that is smaller at the top and larger at the bottom, increasing the connection area between the upper concrete block and the axial and circumferential buffer components. Furthermore, the connection points between the upper concrete block and the axial and circumferential buffer components are moved downwards, lowering the vertical height of the overall center of gravity and ensuring the stability of the upper concrete block, thereby improving the stability of the wind turbine.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0017] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the wind turbine tower foundation in an embodiment of this utility model is shown; Figure 2 A partial schematic diagram of the main wind turbine tower foundation in an embodiment of this utility model is shown; Figure 3 A schematic diagram of the layout of the axial buffer in an embodiment of the present invention is shown.

[0019] In the figure, there are upper concrete block 1, lower concrete block 2, vertical sidewall 101, inclined sidewall 102, outer base concrete block 3, axial buffer 4, and circumferential buffer 5. Detailed Implementation

[0020] The following description provides many different embodiments or examples for implementing various features of the present invention. The elements and arrangements described in the specific examples below are only for concise expression of the present invention and are merely examples, not intended to limit the present invention.

[0021] 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] This utility model provides a wind turbine tower foundation. Figure 1 A schematic diagram of the wind turbine tower foundation according to an embodiment of the present invention is shown. Figure 1 In the middle, the wind turbine tower foundation is used to be buried underground, specifically including: upper concrete block 1, lower concrete block 2, outer foundation concrete block 3, axial buffer assembly and circumferential buffer assembly; Correspondingly, the upper concrete block 1 and the lower concrete block 2 are arranged vertically and are coaxially arranged. The radius of the upper concrete block 1 is smaller than the radius of the lower concrete block 2, and the area of ​​the upper end face of the upper concrete block 1 is smaller than the area of ​​the lower end face of the upper concrete block 1. An axial buffer assembly is provided between the upper concrete block 1 and the lower concrete block 2. The two ends of the axial buffer assembly are respectively connected to the lower end face of the upper concrete block 1 and the upper end face of the lower concrete block 2. The lower concrete block 2 has an annular groove on its side wall. One end of the outer base concrete block 3 is sleeved with the side wall of the annular groove. The other end of the outer base concrete block 3 extends to the side of the upper concrete block 1 until it is flush with the upper surface of the upper concrete block 1. The side wall of the upper concrete block 1 is sleeved with the inner annular side wall of the circumferential buffer assembly. The outer annular side wall of the circumferential buffer assembly is sleeved with the inner annular side wall of the outer base concrete block 3.

[0023] The wind turbine tower foundation proposed in this application divides the entire wind turbine tower foundation into three parts, including an upper concrete block 1, a lower concrete block 2, and an outer foundation concrete block 3. During construction, the lower concrete block 2 is connected to the ground foundation by pouring long steel bars, and the outer foundation concrete block 3 is fixedly connected to the lower concrete block 2 by pouring concrete with fixed steel bar clusters. The upper concrete block 1 is connected to the lower concrete block 2 by an axial buffer assembly, and the upper concrete block 1 is connected to the outer foundation concrete block 3 by a circumferential buffer assembly. In actual use, the device is buried below the ground so that the upper end face of the upper concrete block 1 is flush with the ground for the docking and installation of the wind turbine tower.

[0024] The axial buffer assembly achieves axial vibration buffering of the upper concrete block 1, forming a reaction force for the tower to drive the upper concrete block 1 to move upward. The circumferential buffer assembly achieves circumferential buffering of the wind turbine tower, forming a soft connection in both the axial and circumferential directions.

[0025] The wind turbine tower foundation proposed in this application has an outer concrete block 3 with one end flush with the upper surface of the upper concrete block 1, and the other end of the outer concrete block 3 forming a rigid connection with the lower concrete block 2. The lower concrete block 2 provides vertical support to the outer concrete block 3. The lower concrete block 2 and the outer concrete block 3 form an inner cavity for accommodating the upper concrete block 1. The upper concrete block 1 is flexibly connected to the lower concrete block 2 and the outer concrete block 3 by axial buffer components and circumferential buffer components, so as to relieve the axial and circumferential forces of the upper concrete block 1. At the same time, combined with the upper concrete block 1 adopting a structural design of smaller at the top and larger at the bottom, the connection area between the upper concrete block 1 and the axial buffer components and the circumferential buffer components is increased. The connection points between the upper concrete block 1 and the axial buffer components and the circumferential buffer components are moved downward, reducing the vertical height of the overall center of gravity, ensuring the stability of the upper concrete block 1, and thus improving the stability of the wind turbine.

[0026] During the construction of the device, the design of extending one end of the outer base concrete block 3 to the upper layer concrete block 1 to be flush with the upper surface of the upper layer concrete block 1 is combined so that the inclined sidewall 102 and the inner ring sidewall of the outer base concrete block 3 together form a filling cavity for earth filling and compaction, thereby achieving natural buffering of the vibration of the upper layer concrete block 1 and making reasonable use of the natural conditions of the construction site.

[0027] In this embodiment, the sidewall of the upper concrete block 1 includes an inclined sidewall 102 and a vertical sidewall 101 that are connected vertically. The vertical sidewall 101 is sleeved with the circumferential buffer assembly. The inclined sidewall 102 forms an acute angle with the lower end face of the upper concrete block 1 to form a filling cavity for earthwork filling. The connection point between the upper concrete block 1 and the circumferential buffer assembly is lowered to improve the overall stability.

[0028] For example, the inclined sidewall 102 forms an angle of 22° to 28° with the lower end face of the upper concrete block 1, and the radius of the upper end face of the upper concrete block 1 is one-fifth to one-quarter of the radius of the lower end face of the upper concrete block 1.

[0029] It should be further explained that the upper end face of the upper concrete block 1 is set according to the cross-sectional structure of the wind turbine tower, and the area of ​​the upper end face of the upper concrete block 1 is consistent with the cross-sectional area of ​​the wind turbine tower, thereby determining the area of ​​the lower end face of the upper concrete block 1 and ensuring the overall stability of the upper concrete block 1 in supporting the wind turbine tower.

[0030] The axial buffer assembly includes several coaxially arranged buffer rings with progressively increasing radii, the radius difference between adjacent buffer rings being 25cm to 30cm. Correspondingly, the buffer ring includes several axial buffers 4 arranged in a circular array about the axis of the upper concrete block 1, and the included angle between the centers of adjacent axial buffers 4 in the same buffer ring about the axis of the upper concrete block 1 is 24° to 26°.

[0031] For example, the radius difference between adjacent buffer rings is 30cm, and the included angle between the centers of adjacent axial buffers 4 in the same buffer ring and the center line of the upper concrete block 1 is 24°.

[0032] In actual construction, the two ends of the axial buffer 4 are respectively connected to the lower end face of the upper concrete block 1 and the upper end face of the lower concrete block 2 by bolts. By setting the spacing between adjacent axial buffers 4, while ensuring that several axial buffers 4 meet the axial force requirements of the corresponding wind turbine tower, a buffer space is provided between adjacent axial buffers 4, providing a buffer margin when the upper concrete block 1 undergoes circumferential offset movement. Correspondingly, in Figure 2 In the example shown, the circumferential buffer assembly includes two circumferential buffer rings arranged vertically. The upper circumferential buffer ring is connected to the inclined sidewall 102 via its connection surface with the vertical sidewall 101, and the lower circumferential buffer ring is connected to the lower end face of the upper concrete block 1 via its connection surface with the vertical sidewall 101. This creates two force-bearing surfaces arranged vertically between the circumferential buffer assembly and the vertical sidewall 101, improving the connection stability between the circumferential buffer assembly and the sidewall of the upper concrete block 1. In addition to buffering the force of circumferential horizontal displacement on the upper concrete block 1, it further achieves the buffering effect of inclined force on the upper concrete block 1.

[0033] In addition, the two circumferential buffer rings maintain a predetermined distance in the axial direction, and the circumferential buffer rings include a plurality of circumferential buffers 5 arranged in a circular array about the axis of the upper concrete block 1. When facing the upper concrete block 1 and making axial position offset, they provide buffer space for the axial movement of the upper concrete block 1, thereby further improving the buffer margin.

[0034] To further improve the connection stability between the axial buffer 4 and the lower concrete block 2 and the upper concrete block 1; The upper end of the lower concrete block 2 is provided with several second base grooves corresponding to several axial buffers 4, and the lower end of the upper concrete block 1 is provided with several first base grooves corresponding to several axial buffers 4. The two ends of the axial buffers 4 are inserted into the corresponding second base grooves and first base grooves.

[0035] In this embodiment, the axial length of the lower concrete block 2 is 1.3 to 1.6 times the axial length of the upper concrete block 1, and the axial length of the outer base concrete block 3 is 1.8 to 2 times the axial length of the upper concrete block 1. The radius of the lower concrete block 2 is 1.3 to 1.6 times the radius of the upper concrete block 1.

[0036] By limiting the specifications of the upper concrete block 1, the lower concrete block 2, and the outer base concrete block 3, the overall control of the device can be achieved.

[0037] To further illustrate the wind turbine tower foundation of this application, we will take the usage requirements of a 5 MW wind turbine as an example. The corresponding requirements are a tower base width of 5.2 meters, a height of 120 meters from the ground to the center of the wind turbine blades (hub), and an extreme wind speed of 50 m / s for the wind turbine tower foundation to withstand wind impact. The first-order frequency of the tower for a 5-megawatt (MW) wind turbine is 0.25 Hz, and the passing frequency of the turbine blades is 0.51 Hz.

[0038] The lower end radius of the upper concrete block 1 is 5.2 meters, and the lower end radius of the upper concrete block 1 is 1 meter. The axial buffer assembly includes 9 buffer rings, each buffer ring including 15 axial buffers 4 arranged in a circular array, for a total of 135 axial buffers 4, which are radially distributed. Figure 3 In the example shown, 135 axial buffers 4 form 15 radial edges, each radial edge including 9 axial buffers 4.

[0039] For example, the radius difference between adjacent buffer rings of the axial buffer 4 is 30cm, and the included angle between the centers of adjacent axial buffers 4 in the same buffer ring about the axis of the upper concrete block 1 is 24°.

[0040] The coverage radius of the axial buffer assembly is: (9-1)*0.3m=2.4m; The coverage radius of the axial buffer assembly ranges from 2.6 meters to 5.0 meters, with the corresponding distribution density as follows: .

[0041] It should be noted that the International Electrotechnical Commission (IEC) standard requires a minimum of two buffers per meter; based on Therefore, it is evident that the device in this application meets the design requirements.

[0042] Furthermore, the axial stiffness K of each axial buffer 4 in this application S The value is 500 kN / mm, and the corresponding equivalent stiffness of each radial edge is: K 边 =K S / 9≈55.6KN / mm; The total axial stiffness of the axial buffer assembly is: Ktotal = 15 * Ktotal 边 ≈834KN / mm; Combined, the basic system frequency calculation formula for the axial buffer assembly is as follows: (1) In the formula, The value m represents the total stiffness of the buffer system; m represents the mass of the tower base, for example, quality is ; This indicates the base system frequency of the axial buffer assembly.

[0043] Corresponding calculation: (2) based on It is evident that the device of this application satisfies the requirement to avoid the resonance frequency of the tower and wind turbine blades during operation, thus ensuring the overall stability of the wind turbine.

[0044] Furthermore, according to the corresponding formula for calculating the damping ratio of the radial layout: (3) In the formula, This indicates the damping ratio of the concrete foundation, exemplarily 0.05; This represents the layout correction factor, which is, for example, 0.12; Indicates the maximum coverage radius of the axial buffer assembly; Indicates the number of radiating edges; This indicates the spacing between adjacent buffers.

[0045] Corresponding calculation: (4) It should be noted that, according to the standard GB50135 "Design Standard for Tall Structures", the minimum standard value for vibration control in structural design is 0.08; therefore, 0.155 is greater than 0.08, exceeding the standard by 210%, and thus meets the design requirements.

[0046] In addition, this utility model also discloses a wind turbine generator set, including a wind turbine generator set tower foundation as described above.

[0047] In the description of this utility model, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they may refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] It should be understood that all terms used to indicate orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present 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, be constructed and operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind turbine tower foundation for embedding in the ground, characterized in that include: Upper concrete block (1), lower concrete block (2), outer base concrete block (3), axial buffer assembly and circumferential buffer assembly; The upper concrete block (1) and the lower concrete block (2) are arranged coaxially in a vertical position. The area of ​​the upper end face of the upper concrete block (1) is smaller than the area of ​​the lower end face of the upper concrete block (1). An axial buffer assembly is provided between the upper concrete block (1) and the lower concrete block (2). The two ends of the axial buffer assembly are respectively connected to the lower end face of the upper concrete block (1) and the upper end face of the lower concrete block (2). The lower concrete block (2) has an annular groove on its side wall. One end of the outer base concrete block (3) is sleeved with the side wall of the annular groove. The other end of the outer base concrete block (3) extends to the side of the upper concrete block (1) to be flush with the upper surface of the upper concrete block (1). The side wall of the upper concrete block (1) is sleeved with the inner annular side wall of the circumferential buffer assembly. The outer annular side wall of the circumferential buffer assembly is sleeved with the inner annular side wall of the outer base concrete block (3).

2. The wind turbine tower foundation of claim 1, wherein, The sidewall of the upper concrete block (1) includes an inclined sidewall (102) and a vertical sidewall (101) that are connected vertically. The vertical sidewall (101) is sleeved with the circumferential buffer assembly. The inclined sidewall (102) forms an acute angle with the lower end face of the upper concrete block (1).

3. The wind turbine tower foundation of claim 2, wherein, The upper end face radius of the upper concrete block (1) is one-fifth to one-quarter of the lower end face radius of the upper concrete block (1), and the inclined sidewall (102) forms an angle of 22° to 28° with the lower end face of the upper concrete block (1).

4. The wind turbine tower foundation of claim 1, wherein, The axial buffer assembly includes several coaxially arranged buffer rings with progressively increasing radii, and the radius difference between adjacent buffer rings is 25cm to 30cm.

5. The wind turbine tower foundation of claim 4, wherein, The buffer ring includes several axial buffers (4) arranged in a circular array about the axis of the upper concrete block (1), and the included angle between the centers of adjacent axial buffers (4) about the axis of the upper concrete block (1) in the same buffer ring is 24° to 26°.

6. The wind turbine tower foundation of claim 1, wherein, The circumferential buffer assembly includes two circumferential buffer rings arranged vertically. The upper circumferential buffer ring is connected to the vertical sidewall (101) at a surface adjacent to the inclined sidewall (102), and the lower circumferential buffer ring is connected to the vertical sidewall (101) at a surface adjacent to the lower end face of the upper concrete block (1).

7. The wind turbine tower foundation of claim 6, wherein, Two circumferential buffer rings maintain a predetermined distance in the axial direction, and the circumferential buffer rings include a plurality of circumferential buffers (5) arranged in a circular array about the axis of the upper concrete block (1).

8. The wind turbine tower foundation of claim 1, wherein, The upper end of the lower concrete block (2) is provided with several second base grooves corresponding to several axial buffers (4), and the lower end of the upper concrete block (1) is provided with several first base grooves corresponding to several axial buffers (4). The two ends of the axial buffers (4) are inserted into the corresponding second base grooves and first base grooves.

9. The wind turbine tower foundation of claim 1, wherein, The axial length of the lower concrete block (2) is 1.3 to 1.6 times that of the upper concrete block (1), and the axial length of the outer base concrete block (3) is 1.8 to 2 times that of the upper concrete block (1). The lower layer concrete block (2) has a radius of 1.3 to 1.6 times the radius of the upper layer concrete block (1).

10. A wind power unit, characterized in that A wind turbine tower foundation comprising a wind turbine tower foundation according to any of claims 1-9.

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