A wind turbine foundation, a wind turbine generator unit and a construction method of the wind turbine foundation

Abstract

The application provides a wind turbine foundation, a wind turbine generator unit and a construction method of the wind turbine foundation. The wind turbine foundation comprises a base body and an adjusting assembly. The adjusting assembly comprises an adjusting part, a pressure adjusting device and a locking mechanism. The adjusting part comprises a first shell and a second shell connected by a dynamic seal to form a cavity. The locking mechanism is arranged at the connection between the first shell and the second shell and can limit the movement of the second shell to the side close to the first shell in the first direction. The pressure adjusting device is in communication with the cavity and is used for adjusting the pressure of the fluid in the cavity. The pressure adjusting device can increase the pressure of the fluid in the cavity, move the second shell of the adjusting part away from the first shell, lift the subsidence area of the base body and realize the adjustment of the base body. The pressure adjusting device can also decrease the pressure of the fluid in the cavity. When the pressure of the fluid in the cavity is lower than the atmospheric pressure, the connection between the base body and the foundation is more firm, which is beneficial to improve the overturning resistance of the wind turbine foundation.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a construction method for a wind turbine foundation, a wind turbine generator set, and a wind turbine foundation. Background Technology

[0002] Wind energy, as a clean energy source, is attracting increasing attention. With the continuous development of the wind power industry, the single-unit capacity of wind turbines is constantly increasing, and the tower height of wind turbines is also rising. This places increasingly greater demands on the load-bearing capacity and anti-overturning ability of wind turbine foundations. To meet these requirements, wind turbine foundations are becoming increasingly larger, requiring more floor space and concrete, leading to a significant increase in foundation costs. Therefore, developing a new type of foundation is urgently needed.

[0003] Secondly, with the operation of wind turbine generators, the differential settlement of the turbine foundations has gradually become apparent. Wind turbine generators are tall structures, extremely sensitive to tilt; even a slight tilt of the foundation can cause a significant horizontal deviation in the generator, which, under the weight of the nacelle, rotor, and tower, can easily lead to malfunctions. To address this, some leveling devices for wind turbine generators have been developed, but most existing leveling devices are time-consuming and labor-intensive, requiring foundation excavation, backfilling, and jacking, which can easily cause secondary damage to the foundation. Summary of the Invention

[0004] In view of the above problems, this application provides a construction method for a wind turbine foundation, a wind turbine generator set, and a wind turbine foundation. This wind turbine foundation can not only adjust settlement but also enhance anti-overturning ability and has high safety.

[0005] In a first aspect, this application provides a wind turbine foundation, including a base and an adjustment assembly. The base is supported on a foundation and at least partially buried within the foundation. The adjustment assembly is connected between the base and the foundation, and includes an adjustment component, a pressure regulating device, and a locking mechanism. The adjustment component includes a first housing and a second housing that are dynamically sealed to each other and form a cavity. The first housing is connected to the foundation, and the second housing is connected to the base. The second housing is movably connected to the first housing along a first direction. The locking mechanism is disposed at the connection between the first housing and the second housing, and the locking mechanism can restrict the second housing from moving along the first direction toward the side closer to the first housing. The pressure regulating device communicates with the cavity and is used to adjust the pressure of the fluid in the cavity.

[0006] In the wind turbine foundation provided in the specific embodiments of this application, the locking mechanism includes a piston and a guide cylinder. The guide cylinder is connected to the first housing and extends along a first direction. The piston is connected to the second housing and is slidably connected to the inner wall of the guide cylinder. The guide cylinder is provided with a guide locking structure to restrict the piston from moving towards the first housing.

[0007] In the wind turbine foundation provided in the specific embodiments of this application, the guide locking structure includes a plurality of guide locking parts that are spaced apart and protruding on the inner wall of the guide cylinder. Each guide locking part includes a support surface and a guide surface that are connected to each other. The guide surface is set at an acute angle to the first direction, and the piston can slide across the guide surface and support the support surface.

[0008] In the wind turbine foundation provided in the specific embodiments of this application, a first connecting mechanism is provided on the first shell, and the first connecting mechanism is placed in the foundation and connected to the base.

[0009] In the wind turbine foundation provided in the specific embodiments of this application, the first connecting mechanism includes at least two first connecting portions connected to the first housing, and the center lines of the at least two first connecting portions are intersecting.

[0010] In the wind turbine foundation provided in the specific embodiments of this application, the first connecting part includes a connecting body and a first anchor bolt disposed in the connecting body. One end of the first anchor bolt is connected to the first housing and the other end is connected to the connecting body.

[0011] In the wind turbine foundation provided in the specific embodiments of this application, a second anchor bolt is provided on the second shell, and the second anchor bolt is placed in the base and connected to the base.

[0012] In the wind turbine foundation provided in the specific embodiments of this application, multiple adjusting members are provided, and the multiple adjusting members are equally spaced around the outer periphery of the central axis of the base.

[0013] In the wind turbine foundation provided in the specific embodiments of this application, the base is provided with a grouting pipe, which is connected to the bottom surface of the base.

[0014] In the wind turbine foundation provided in the specific embodiments of this application, the wind turbine foundation also includes a curtain structure, which is connected to the bottom surface of the base and surrounds the outer perimeter of the adjusting member, and the curtain structure is placed in the foundation.

[0015] Secondly, this application provides a wind turbine generator set, which includes a wind turbine foundation, a tower and a wind turbine rotor provided by any of the above technical solutions, wherein the tower is disposed on the wind turbine foundation and connected to the base body; and the wind turbine rotor is disposed on the tower.

[0016] In the wind turbine generator set provided in the specific embodiments of this application, the wind turbine generator set further includes a settlement sensor, a wind speed sensor, and a controller. The settlement sensor is disposed on the base of the wind turbine foundation, the wind speed sensor is disposed on the wind rotor, and the controller is electrically connected to the wind speed sensor, the settlement sensor, and the pressure regulation device. The controller is configured to control the pressure regulation device to extract fluid from the cavity when the wind speed measured by the wind speed sensor is greater than a first preset value. The controller is also configured to control the pressure regulation device to fill the cavity with fluid when the settlement value measured by the settlement sensor is greater than a second preset value.

[0017] Secondly, this application provides a construction method for a wind turbine foundation, which includes the following steps:

[0018] The foundation preparation process involves excavating a foundation pit in the soil to form the foundation.

[0019] The installation steps of the adjustment component include providing an adjustment component, which includes an adjustment element and a pressure adjustment device. The adjustment element includes a first housing and a second housing that are dynamically sealed to each other. The first housing is connected to the foundation, and the adjustment element is connected to the pressure adjustment device through a fluid pipe.

[0020] The process of pouring the base involves pouring concrete into the foundation pit to form the base, with at least a portion of the second shell being poured into the base.

[0021] In the construction method for wind turbine foundations provided in the specific embodiments of this application, the foundation processing step includes:

[0022] The strata were excavated to form a foundation pit;

[0023] Excavate a ring-shaped curtain trench in the foundation;

[0024] Grout is poured into the curtain trenches to form the curtain structure.

[0025] In the construction method for wind turbine foundations provided in the specific embodiments of this application, the installation steps of the adjustment components include:

[0026] The first anchor bolt and the second anchor bolt are respectively connected to the first housing and the second housing of the adjusting member;

[0027] Make the first hole in the foundation;

[0028] The first housing connected to the first anchor bolt is placed at the first hole, so that the first anchor bolt is set in the first hole;

[0029] Grout is injected into the first hole to form the first connecting mechanism.

[0030] In the construction method for a wind turbine foundation provided in the specific embodiments of this application, before the step of placing the first housing connected with the first anchor bolt at the first hole, the method further includes:

[0031] The foundation where the first hole is located is reinforced.

[0032] In the construction method for the wind turbine foundation provided in the specific embodiments of this application, the step prior to pouring the foundation includes:

[0033] Concrete is poured on the foundation to form a cushion layer, and at least part of the first shell is poured into the cushion layer.

[0034] In the construction method of the wind turbine foundation provided in the specific embodiments of this application, in the step of pouring the base, a second hole and a grouting hole are reserved in the base, a second anchor bolt connected to the second shell passes through the second hole and is connected to the base, and a grouting pipe is provided in the grouting hole.

[0035] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0036] This application provides a wind turbine foundation, which includes a base and an adjustment assembly. The adjustment assembly includes an adjustment component, a pressure regulating device, and a locking mechanism. The adjustment component includes a first housing and a second housing forming a cavity through a dynamic sealing connection. The locking mechanism is located at the connection between the first housing and the second housing and can restrict the movement of the second housing towards the side closer to the first housing in a first direction. The pressure regulating device communicates with the cavity and is used to adjust the pressure of the fluid in the cavity. With the above structure, the pressure regulating device can fill the cavity with fluid, increasing the pressure of the fluid in the cavity. When the pressure of the fluid in the cavity increases to a value greater than a predetermined value, the second housing of the adjustment component moves away from the first housing, which can lift the sinking area of ​​the base and realize the adjustment of the base. The pressure regulating device can also extract fluid from the cavity, decreasing the pressure of the fluid in the cavity. Due to the restriction of the locking mechanism, the second housing cannot move closer to the first housing. When the pressure of the fluid in the cavity decreases to less than atmospheric pressure, the connection between the base and the foundation is more secure under the action of atmospheric pressure, which is beneficial to improving the overturning resistance of the wind turbine foundation.

[0037] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0039] In the attached diagram:

[0040] Figure 1 This is a schematic diagram of the structure of a wind turbine foundation provided in some embodiments of this application;

[0041] Figure 2 This is a schematic diagram of the structure of the adjusting component in the wind turbine foundation provided in some embodiments of this application;

[0042] Figure 3This is a schematic diagram of the locking mechanism in an adjusting member provided in some embodiments of this application;

[0043] Figure 4 A flowchart illustrating the construction method of a wind turbine foundation provided in some embodiments of this application;

[0044] Figure 5 A flowchart illustrating the foundation processing steps in the construction method for wind turbine foundations provided in some embodiments of this application;

[0045] Figure 6 This is a flowchart illustrating the installation steps of the adjustment component in the construction method of a wind turbine foundation provided in some embodiments of this application.

[0046] 1. Matrix; 11. Grouting pipe; 12. Fluid pipe; 13. Foundation section; 14. Variable cross-section section; 15. Third anchor bolt; 2. Adjusting component; 21. First shell; 211. First connecting mechanism; 2111. First anchor bolt; 2112. Connector; 22. Second shell; 221. Second anchor bolt; 23. Cavity; 24. Locking mechanism; 241. Piston; 242. Guide cylinder; 2421. Guide locking structure; 24211. Supporting surface; 24212. Guide surface; 3. Pressure regulating device; 4. Curtain structure; 5. Settlement sensor; 6. Subbase; 7. Pressure sensor; 10. Foundation; 20. Backfill soil. Detailed Implementation

[0047] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0048] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0049] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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 the embodiments of this application.

[0050] Furthermore, technical terms such as "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. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" 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 or an electrical connection; 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0052] In the description of the embodiments of this application, unless otherwise expressly 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," "on top of," and "over" 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.

[0053] To enable wind turbine foundations to have strong anti-overturning capabilities while also allowing for settlement adjustment, this application provides a wind turbine foundation comprising an adjustment assembly connected between the base and the ground. The first and second housings of the adjustment assembly are respectively connected to the ground and the base, forming a cavity through a dynamic sealing connection. A locking mechanism at the connection between the first and second housings restricts the settlement of the second housing connected to the base. When a pressure regulating device fills the cavity with fluid, and the pressure in the cavity exceeds a predetermined value, the second housing lifts the base, raising the subsidence area of ​​the base and thus adjusting the base settlement. When the pressure regulating device extracts fluid from the cavity, the pressure in the cavity becomes less than atmospheric pressure, creating a negative pressure. While the locking mechanism restricts the settlement of the second housing, the atmospheric pressure further strengthens the connection between the base and the ground, reducing the possibility of the wind turbine foundation overturning.

[0054] The wind turbine foundation disclosed in this application can be used, but is not limited to, foundations for wind turbine generator sets. It can also be used for hoisting other cylindrical, columnar, or other structures such as buildings. It can not only adjust settlement but also enhance the building's overturning resistance and has high safety.

[0055] The technical solutions for the construction methods of wind turbine foundations, wind turbine generator sets, and wind turbine foundations provided in the specific embodiments of this application will be further explained below.

[0056] like Figure 1 As shown, some embodiments of this application provide a wind turbine foundation, which includes a base 1 and an adjustment assembly. The base 1 is supported on a foundation 10 and is at least partially buried within the foundation 10. The adjustment assembly is connected between the base 1 and the foundation 10, and includes an adjustment component 2, a pressure regulating device 3, and a locking mechanism 24. Figure 2 As shown, the regulating component 2 includes a first housing 21 and a second housing 22 that are dynamically sealed to each other and form a cavity 23. The first housing 21 is connected to the foundation 10, and the second housing 22 is connected to the base 1. The second housing 22 is movably connected to the first housing 21 along a first direction. A locking mechanism 24 is disposed at the connection between the first housing 21 and the second housing 22. The locking mechanism 24 can restrict the second housing 22 from moving along the first direction toward the side closer to the first housing 21. The pressure regulating device 3 is connected to the cavity 23 and is used to regulate the pressure of the fluid in the cavity 23.

[0057] The base 1 refers to the main structure of the wind turbine foundation, which is supported on the foundation 10 and directly connected to the tower. It bears the load of the wind turbine tower and the portion above it, and provides anti-overturning moment for the tower. The base 1 can be formed by pouring and curing concrete in the foundation pit, or it can be prefabricated in a factory by pouring and curing concrete into a mold. In some embodiments, the base 1 can be placed in the foundation pit, with at least a portion of the base 1 buried in the foundation 10 by filling the pit with backfill soil 20.

[0058] The adjusting component can refer to a component disposed between the base 1 and the foundation 10. It connects the base 1 and the foundation 10, and the adjusting component can lift the base 1 by increasing its volume, thereby adjusting the settlement of the wind turbine foundation. In some embodiments of this application, the increase in the volume of the adjusting component can be achieved by moving the first housing 21 and the second housing 22 relatively further apart or closer together, which can better translate the change in the volume of the adjusting component into the lifting or lowering of the base 1.

[0059] Adjusting component 2 can refer to a member in the adjusting assembly, which is a spherical component capable of vertical displacement, with an internal cavity 23. The first housing 21 and the second housing 22 are connected by a dynamic seal to form the cavity 23. The relative movement between the first housing 21 and the second housing 22 achieves a change in the volume of the adjusting component 2. In some embodiments of this application, the change in the volume of the adjusting component 2 can be a relative movement of the first housing 21 and the second housing 22 towards or away from each other, which better translates the change in the volume of the adjusting assembly into a rise or fall of the base 1.

[0060] In some embodiments, both the first housing 21 and the second housing 22 are metal housing structures with high strength. This ensures that the first housing 21 and the second housing 22 maintain their original shapes even when the pressure in the cavity 23 changes, and also allows the adjusting member 2 to withstand the loads of components such as the base 1 without damage. The dynamic sealing connection between the first housing 21 and the second housing 22 can refer to a sealed sliding connection, preventing fluid leakage in the cavity 23 and allowing the first housing 21 and the second housing 22 to move relative to each other under the influence of the fluid in the cavity 23. Both the first housing 21 and the second housing 22 can refer to structures similar to Magdeburg hemispheres, allowing the cavity 23 within the first housing 21 and the second housing 22 to become a cavity with a vacuum degree.

[0061] In some embodiments, the second housing 22 is slidably connected to the first housing 21 along a first direction, such that the second housing 22 can move relative to the first housing 21 along the first direction under the action of the cavity 23.

[0062] The first direction can refer to the vertical direction, allowing the second shell 22 to move vertically relative to the first shell 21 under the action of the fluid in the cavity 23. By positioning the second shell 22 above the first shell 21, with the first shell 21 connected to the foundation 10 and the second shell 22 connected to the base 1, the base 1 can move vertically relative to the foundation 10 under the action of the adjusting member 2, thus realizing the raising and lowering of the base 1 relative to the foundation 10 and adjusting the settlement of the base 1.

[0063] The locking mechanism 24 is disposed at the connection between the first housing 21 and the second housing 22. It can refer to a mechanism that can unidirectionally restrict the mutual movement of the first housing 21 and the second housing 22. Specifically, the locking mechanism 24 can restrict the second housing 22 from moving along the first direction toward the side closer to the first housing 21, so that the second housing 22 can only move along the first direction away from the first housing 21 and cannot move toward the side closer to the first housing 21. This makes the base 1 only able to rise and not fall, which helps to prevent the base 1 from sinking due to the installation of the adjustment component.

[0064] The locking mechanism 24 can also refer to a mechanism capable of restricting the mutual movement of both the first housing 21 and the second housing 22. Specifically, when the second housing 22 moves along the first direction toward the side closer to the first housing 21, the locking mechanism 24 can lock the second housing 22, preventing it from moving, thus locking the base 1 during its ascent and stopping its movement; when the second housing 22 moves along the first direction away from the first housing 21, the locking mechanism 24 can lock the second housing 22, preventing it from moving, thus locking the base 1 during its descent and stopping its movement.

[0065] The pressure regulating device 3 can refer to a device capable of adjusting pressure, which is connected to the cavity 23 and used to adjust the pressure of the fluid in the cavity 23. In some embodiments, the pressure regulating device 3 can fill the cavity 23 with fluid to increase the pressure of the liquid in the cavity 23, and the pressure regulating device 3 can also extract fluid from the cavity 23 to decrease the pressure of the liquid in the cavity 23.

[0066] The pressure regulating device 3 can be a pump, which is connected to a prime mover such as a motor. Driven by the prime mover, the pump can fill the cavity 23 with fluid or extract the fluid from the cavity 23 to change the pressure in the cavity 23 of the regulating member 2. In some embodiments, the fluid in the cavity 23 can be hydraulic oil, air, or a gas with low reactivity such as nitrogen. Those skilled in the art can select the type of fluid according to the actual situation.

[0067] Through the above structure, the pressure regulating device 3 can fill the cavity 23 with fluid, thereby increasing the pressure of the fluid in the cavity 23. When the pressure of the fluid in the cavity 23 increases to a value greater than a predetermined value, the second housing 22 of the regulating member 2 moves away from the first housing 21, which can lift the base 1 or the sinking area of ​​the base 1, thus realizing the adjustment of the base 1. The pressure regulating device 3 can also extract fluid from the cavity 23, thereby decreasing the pressure of the fluid in the cavity 23 and forming a negative pressure. Due to the restriction of the locking mechanism 24, the second housing 22 cannot move close to the first housing 21. When the pressure of the fluid in the cavity 23 decreases to less than the atmospheric pressure, the connection between the base 1 and the foundation 10 becomes more solid under the action of atmospheric pressure, which is beneficial to improving the overturning resistance of the wind turbine foundation. In some embodiments, the base 1 includes a foundation section 13 and a variable cross-section section 14. The foundation section 13 can be configured as a column structure with its central axis arranged along a first direction. The variable cross-section section 14 surrounds the outer periphery of the foundation section 13, giving the base 1 a structure that is smaller at the top and larger at the bottom, which is beneficial for improving the stability of the base 1 during use. Specifically, a third anchor bolt 15 is provided in the foundation section 13. The third anchor bolt 15 is arranged along the central axis of the foundation section 13. One end of the third anchor bolt 15 extends out of the end of the foundation section 13, and the other end is connected to the foundation section 13 through the enlarged head of the third anchor bolt 15, thereby enhancing the overall structural strength of the base 1.

[0068] Specifically, the adjustment component is connected between the bottom of the variable cross-section section 14 in the base 1 and the foundation 10, so that the adjustment component can adjust the tilt of the base 1 by lifting the variable cross-section section 14, thereby adjusting the uneven settlement of the base 1 and helping to keep the base 1 level.

[0069] In some embodiments, the adjustment component 2 in the adjustment assembly is provided with a plurality of adjustment members 2, which are equally spaced around the outer periphery of the central axis of the base 1.

[0070] By providing multiple adjusting members 2, and arranging them at equal intervals around the central axis of the base 1, the adjusting assembly can lift the base 1 in various directions through the multiple adjusting members 2, thereby adjusting the settlement of the base 1 in various directions.

[0071] In some embodiments, such as Figure 3 As shown, the locking mechanism 24 includes a piston 241 and a guide cylinder 242. The guide cylinder 242 is connected to the first housing 21 and extends along the first direction. The piston 241 is connected to the second housing 22. The piston 241 is slidably connected to the inner wall of the guide cylinder 242. The guide cylinder 242 is provided with a guide locking structure 2421 to restrict the piston 241 from moving towards the first housing 21.

[0072] Piston 241 is connected to the second housing 22, and guide cylinder 242 is connected to the first housing 21 and extends along a first direction. Piston 241 is slidably connected to the inner wall of guide cylinder 242, so that the second housing 22 achieves a dynamic sealing connection with the first housing 21 through the sealing sliding cooperation between piston 241 and guide cylinder 242. The extension of guide cylinder 242 along the first direction can guide the central axis of guide cylinder 242 to be configured along the first direction.

[0073] The guide locking structure 2421 can refer to a structure disposed inside the guide cylinder 242, which can unidirectionally lock the piston 241 sliding in the guide cylinder 242, so that the piston 241 can only move in the guide cylinder 242 in a direction away from the first housing 21.

[0074] In some embodiments, the guide locking structure 2421 includes a plurality of guide locking portions spaced apart and protruding on the inner wall of the guide cylinder 242. Each guide locking portion includes a support surface 24211 and a guide surface 24212 connected to each other. The guide surface 24212 is set at an acute angle to the first direction, and the piston 241 can slide across the guide surface 24212 and abut against the support surface 24211.

[0075] The guide locking part refers to the structure protruding from the inner wall of the guide cylinder 242, which can unidirectionally lock the piston 241 sliding in the guide cylinder 242. The abutting surface 24211 and the guide surface 24212 both refer to the structural surfaces on the guide locking part. The guide surface 24212 is set at an acute angle to the first direction, and the abutting surface 24211 is set perpendicular to the first direction, so that the piston 241 can slide over the guide surface 24212 and abut against the abutting surface 24211.

[0076] In some embodiments, the guide surface 24212 is close to the first housing 21 relative to the abutment surface 24211, such that when the piston 241 moves away from the first housing 21 in the guide cylinder 242, it will not abut against the abutment surface 24211, but when it moves towards the first housing 21, it will abut against the abutment surface 24211, thus restricting the movement of the piston 241 towards the first housing 21.

[0077] Preferably, the guide locking parts on the inner wall of the guide cylinder 242 are arranged in pairs. The paired guide locking parts provide more stable support to the piston 241, which makes the guide locking parts have a higher load-bearing capacity and helps to improve the stability of the locking mechanism 24 in restricting the movement of the second housing 22.

[0078] In some embodiments, the guide locking portions on the inner wall of the guide cylinder 242 are provided in multiple pairs at intervals along the first direction, so that the locking mechanism 24 can adjust the movement of the second housing 22 in multiple positions, and the fan foundation can adjust the settlement in multiple positions, which is beneficial to improving ease of use.

[0079] Preferably, the first housing 21 is provided with a first connecting mechanism 211, which is placed in the foundation 10 and connected to the base 1.

[0080] The first connecting mechanism 211 may refer to a component disposed on the first housing 21 for connecting with the foundation 10. It is located in the foundation 10 and connected to the base 1, so that the first housing 21 is firmly connected to the foundation 10.

[0081] In some embodiments, the first connecting mechanism 211 includes at least two first connecting portions connected to the first housing 21, and the center lines of the at least two first connecting portions are intersecting.

[0082] By providing at least two intersecting first connecting parts, the first connecting mechanism 211 is made into a claw-shaped structure, which, when placed in the foundation 10, can improve the firmness of the connection between the first shell 21 and the foundation 10.

[0083] Preferably, the first connecting part includes a connecting body 2112 and a first anchor bolt 2111 disposed in the connecting body 2112, one end of the first anchor bolt 2111 being connected to the first housing 21 and the other end being connected to the connecting body 2112.

[0084] The connector 2112 can be a structure formed by grouting and curing. It wraps around the outer periphery of the first anchor bolt 2111. The connector 2112 connects to the surface of the first shell 21 and the foundation 10, which helps to improve the integrity of the first shell 21 and the foundation 10. One end of the first anchor bolt 2111 is connected to the first shell 21, and the other end is connected to the interior of the connector 2112 through an enlarged head, which improves the connection strength between the first anchor bolt 2111 and the connector 2112.

[0085] In some embodiments, a second anchor bolt 221 is provided on the second housing 22, and the second anchor bolt 221 is placed in the base 1 and connected to the base 1.

[0086] By connecting the second housing 22 to the base 1 using the second anchor bolt 221, the connection strength between the second housing 22 and the base 1 is improved.

[0087] Preferably, the second anchor bolt 221 is disposed in the variable cross-section section 14 of the base 1. The second anchor bolt 221 penetrates the variable cross-section section 14. One end of the second anchor bolt 221 is connected to the second shell 22, and the other end extends out of the variable cross-section section 14 and is connected to the variable cross-section section 14, which can further improve the connection strength between the second shell 22 and the variable cross-section section 14.

[0088] In some embodiments, the substrate 1 is provided with a grouting pipe 11, which is connected to the bottom surface of the substrate 1.

[0089] The grouting pipe 11 can refer to a channel formed in the substrate 1, which is connected to the bottom surface of the substrate 1 and is used to inject grout into the bottom surface of the substrate 1. The grouting pipe 11 can be formed by pre-drilling holes in the substrate 1 during its formation and then installing the pipe in the holes, or by pre-installing the pipe through the inner cavity of the pipe during its formation and before pouring concrete, or by removing material from the cured substrate 1.

[0090] When the pressure regulating device 3 can fill the cavity 23 with fluid, the second housing 22 of the regulating member 2 moves away from the first housing 21, and after the base 1 is lifted, a space will be formed between the bottom surface of the base 1 and the foundation 10. Grouting is injected into the space through the grouting pipe 11 by the grouting mechanism to fill the space so as to keep the wind turbine foundation stable.

[0091] Specifically, the variable cross-section section 14 of the substrate 1 is provided with multiple grouting pipes 11. The multiple grouting pipes 11 are equally spaced around the outer periphery of the central axis of the substrate 1, so that the grouting mechanism can uniformly inject grout into the space between the substrate 1 and the foundation 10 through the multiple grouting pipes 11, which is beneficial to make the grout distribution uniform.

[0092] In some embodiments, the wind turbine foundation further includes a curtain structure 4, which is connected to the bottom surface of the base 1 and surrounds the periphery of the adjusting member 2, and is placed in the foundation 10.

[0093] The curtain structure 4 can be a structure formed by the solidification of concrete. It is connected to the bottom surface of the base 1 and placed in the foundation 10. It can not only enhance the connection strength between the base 1 and the foundation 10, but also improve the bearing capacity of the foundation 10. In some embodiments, the curtain structure 4 is connected to the edge of the base 1 and surrounds the periphery of the adjusting member 2. The curtain structure 4 placed in the foundation 10 can effectively block seepage, reduce the buoyancy force of pore water on the wind turbine foundation, increase the anti-tilting ability of the wind turbine foundation, and also have the function of a toothed wall, which can effectively reduce the uneven settlement of the wind turbine foundation.

[0094] Preferably, the wind turbine foundation further includes a fluid conduit 12, which connects the pressure regulating device 3 and the cavity 23 of the regulating member 2, allowing the pressure regulating device 3 to inject fluid into the cavity 23 or extract fluid from the cavity 23 through the fluid conduit 12. In some embodiments, the fluid conduit 12 is buried in the backfill soil 20, which can reduce the possibility of damage to the fluid conduit 12 due to impact from external objects.

[0095] With the above structure, the wind turbine foundation provided by this application can not only save the amount of reinforced concrete and solve the problem of foundations becoming larger and larger and occupying more and more area; it can also provide strong anti-overturning capacity for smaller foundations through the effect of atmospheric pressure, ensuring that the foundation will not collapse in strong winds; and it can be flexibly leveled, so that when uneven settlement occurs in the foundation, it is not necessary to re-excavate the foundation 10 and use jacks to lift it. Leveling can be achieved simply by filling the cavity 23 of the adjusting component 2 with fluid, without damaging the foundation.

[0096] Some embodiments of this application also provide a wind turbine generator set, which includes a tower, a wind turbine rotor, and a wind turbine foundation provided by the above technical solution. The tower is set on the wind turbine foundation and connected to the base 1, and the wind turbine rotor is set on the tower.

[0097] In some embodiments, the wind turbine generator set further includes a settlement sensor 5, a wind speed sensor (not shown in the figure), and a controller (not shown in the figure). The settlement sensor 5 is disposed on the base 1 of the wind turbine foundation, the wind speed sensor is disposed on the hub of the wind turbine rotor, and the controller is electrically connected to the wind speed sensor, the settlement sensor 5, and the pressure regulation device 3. The controller is configured to control the pressure regulation device 3 to extract fluid from the cavity 23 when the wind speed measured by the wind speed sensor is greater than a first preset value, thereby creating a vacuum, improving the integrity of the foundation and the ground 10, and improving the overturning resistance. The controller is also configured to control the pressure regulation device 3 to fill the cavity 23 with fluid when the settlement value measured by the settlement sensor 5 is greater than a second preset value, thereby raising the foundation and achieving leveling.

[0098] In some embodiments, when the wind speed measured by the wind speed sensor is greater than a first preset value, the pressure regulating device 3 draws fluid from the cavity 23 to form a negative pressure. Under the action of atmospheric pressure, the connection between the base 1 and the foundation 10 is more robust, which helps to improve the overturning resistance of the wind turbine foundation. When the wind speed measured by the wind speed sensor is less than or equal to the first preset value, the pressure regulating device 3 is closed, and the pressure regulating device 3 does not change the pressure of the fluid in the cavity 23. In some embodiments, the first preset value can be derived by those skilled in the art based on the overturning value caused by the overturning moment generated by the wind on the wind turbine foundation. It can be 25 m / s or 17 m / s. The specific value of the first preset value can be calculated by those skilled in the art based on the actual situation of the wind turbine generator set to ensure that the wind turbine foundation does not generate an overturning value exceeding the safety requirements.

[0099] Preferably, multiple settlement sensors 5 are provided, and the multiple settlement sensors 5 are equally spaced around the outer periphery of the central axis of the base 1, which can detect the settlement of the base 1 in various directions, so as to accurately know the settlement status of the base 1. In some embodiments, the second preset value can be derived by those skilled in the art based on the allowable tilt rate required by the geological conditions of the wind turbine foundation location. It can be 100mm or 200mm. The specific value of the second preset value can be calculated by those skilled in the art based on the actual situation of the wind turbine generator set, so as to ensure that the wind turbine foundation will not produce a tilt rate exceeding the safety requirements.

[0100] In some embodiments, the wind turbine generator set further includes a pressure sensor 7 electrically connected to the controller. The pressure sensor 7 is disposed in the cavity 23 of the regulating member 2 and is used to measure the pressure of the fluid in the cavity 23, so as to facilitate the adjustment of the pressure in the cavity 23 of the regulating member 2.

[0101] The controller can be a centralized or distributed controller. For example, the controller can be a single microcontroller or a combination of multiple distributed microcontrollers. The microcontroller can run a control program to control the pressure regulating device 3 to achieve its function.

[0102] Some embodiments of this application also provide a construction method for a wind turbine foundation, such as... Figure 4 As shown, the construction method for this wind turbine foundation includes the following steps:

[0103] S10. Processing the foundation 10 step involves excavating a foundation pit in the stratum to form the foundation 10.

[0104] S20. Adjustment component installation steps, providing an adjustment component, the adjustment component including an adjustment element 2 and a pressure adjustment device 3, the adjustment element 2 including a first housing 21 and a second housing 22 dynamically sealed to each other, the first housing 21 is connected to the foundation 10, and the adjustment element 2 is connected to the pressure adjustment device 3 through a fluid pipe 12;

[0105] S30. Step 1: Pour concrete into the foundation pit to form the foundation 1, and at least a portion of the second shell 22 is poured into the foundation 1.

[0106] The foundation 10 is formed by excavating a pit at the bottom layer. Preferably, when excavating the pit, the pit is excavated to bedrock with good geological conditions. In some embodiments, the pit can be a circular pit so as to form a circular base 1 in the pit. Those skilled in the art can excavate the shape of the pit according to the shape of the base 1 to be formed, so that the base 1 of the required shape can be formed in the pit.

[0107] Providing an adjustment assembly can refer to manufacturing the adjustment assembly provided by the aforementioned technical solution in a factory, so that the adjustment assembly can be installed between the foundation 10 and the base 1. The adjustment assembly includes an adjustment element 2 and a pressure adjustment device 3. The adjustment element 2 includes a first housing 21 and a second housing 22 that are dynamically sealed to each other. After the first housing 21 is connected to the foundation 10, the second housing 22 can move relative to the foundation 10 so that the second housing 22 can lift the base 1. By using a fluid pipe 12 to connect the adjustment element 2 and the pressure adjustment device 3, the pressure adjustment device 3 can adjust the fluid pressure in the cavity 23 of the adjustment element 2 by filling or extracting fluid.

[0108] After the first shell 21 of the adjusting member 2 is connected to the foundation 10, concrete is poured into the foundation pit to form the base 1, so that the adjusting member 2 is located between the base 1 and the foundation 10. When pouring concrete into the foundation pit, at least a portion of the second shell 22 is poured into the base 1, so that the second shell 22 of the adjusting member 2 is firmly connected to the base 1. It should be noted that when pouring concrete into the foundation pit, the first shell 21 of the adjusting member 2 should be prevented from being poured into the base 1, so as to prevent the first shell 21 and the second shell 22 from being poured into the base 1, which would prevent the first shell 21 and the second shell 22 from being unable to move relative to each other.

[0109] Preferably, the step prior to pouring the base 1 includes:

[0110] Concrete is poured on the foundation 10 to form a cushion layer 6, and at least part of the first shell 21 is poured into the cushion layer 6.

[0111] Before pouring the base 1, the upper surface of the foundation 10 can be leveled by pouring concrete to form a cushion layer 6 on the foundation 10, thereby improving the level of the upper surface of the foundation 10 and helping to maintain the level of the wind turbine foundation.

[0112] In some embodiments, such as Figure 5 As shown, the 10 steps of foundation processing include the following steps:

[0113] S101. Excavate the strata to form a foundation pit.

[0114] S102. Excavate an annular curtain trench in foundation 10;

[0115] S103. Grout the curtain trench to form the curtain structure 4.

[0116] In the aforementioned foundation processing step 10, an annular curtain trench is excavated within the foundation 10 formed by the foundation pit, and grout is injected into the annular curtain trench, resulting in a curtain structure 4 within the foundation 10. This helps increase the anti-tilting capacity of the wind turbine foundation and reduces uneven settlement of the wind turbine foundation. Grouting the curtain trench allows concrete to be poured into the curtain trench, making the curtain structure 4 a concrete structure with good durability.

[0117] In some embodiments, such as Figure 6 As shown, the adjustment component installation steps include the following steps:

[0118] S201. Connect the first anchor bolt 2111 and the second anchor bolt 221 to the first housing 21 and the second housing 22 of the adjusting member 2, respectively.

[0119] S202. Make the first hole in foundation 10.

[0120] S203. Place the first housing 21 with the first anchor bolt 2111 connected to it at the first hole, so that the first anchor bolt 2111 is set in the first hole.

[0121] S204. Grouting is injected into the first hole to form the first connecting mechanism 211.

[0122] In the above steps, the first anchor bolt 2111 and the second anchor bolt 221 can be connected to the first housing 21 and the second housing 22 when the adjustment part 2 is manufactured in the factory, so that the obtained adjustment part 2 is connected with the first anchor bolt 2111 and the second anchor bolt 221.

[0123] In the above steps, by creating a first hole in the foundation 10, the grout poured into the first hole solidifies to form a first connecting mechanism 211 placed in the foundation 10. Preferably, the depth of the first hole should reach the bedrock, and the bottom of the first hole should be enlarged. When the first anchor bolt 2111 is placed in the first hole, the end of the first anchor bolt 2111 extending into the first hole is connected to the enlarged bottom of the first hole through an enlarged head, so that the first anchor bolt 2111 has a large gripping force. Preferably, multiple first holes with intersecting central axes are created at the foundation 10 corresponding to the first shell 21, so that multiple first connecting mechanisms 211 intersect at the first shell 21, which helps to improve the overall integrity of the connection between the first shell 21 and the foundation 10.

[0124] When grouting the first hole, the first anchor bolt 2111 should be kept in a tensioned state, which will help the first anchor bolt 2111 to provide greater holding force.

[0125] In some embodiments, the method further includes, prior to the step of placing the first housing 21 connected to the first anchor bolt 2111 at the first hole:

[0126] The foundation 10 where the first hole is located is reinforced.

[0127] In the above steps, by reinforcing the foundation 10 where the first hole is located, the bearing capacity of the foundation 10 where the first hole is located can be increased, and the possibility of the adjusting component 2 damaging the foundation 10 can be reduced.

[0128] In some embodiments, during the step of casting the base 1, a second hole and a grouting hole are reserved in the base 1, and a second anchor bolt 221 connected to the second housing 22 passes through the second hole and is connected to the base 1, and a grouting pipe 11 is provided in the grouting hole.

[0129] The second hole can refer to a hole pre-reserved in the substrate 1 during the formation of the substrate 1, which is used to pass through the second anchor bolt 221 connected to the second shell 22. The grouting hole can refer to a hole pre-reserved in the substrate 1 during the formation of the substrate 1, which is used to pass through the pipe used to form the grouting pipe 11.

[0130] It should be noted that since the second housing 22 of the adjusting component 2 is connected to the second anchor bolt 221, the second anchor bolt 221 can be supported by a support when the base 1 is poured, so that the second anchor bolt 221 can remain vertically inserted in the second hole during the pouring of the base 1.

[0131] The construction method for wind turbine foundations provided in this application has strong adaptability. It does not require the redesign of new wind turbine foundations. Wind turbine foundations with the aforementioned effects can be obtained simply by following the construction method described above. It has strong versatility. In addition, the construction method of this wind turbine foundation can improve the adaptability of the wind turbine foundation at different foundation sites, enabling the wind turbine foundation to adapt to different strata.

[0132] The wind turbine foundation provided in this specific embodiment can solve the problem that as the installed capacity of wind turbine generators continues to increase, the size of the wind turbine foundation increases, leading to a continuous increase in the area occupied by the wind turbine foundation and the amount of foundation concrete used. It can effectively reduce the land acquisition area and the amount of foundation concrete used, thereby significantly reducing the cost.

[0133] The wind turbine foundation provided in this specific embodiment can provide strong anti-overturning capability through atmospheric pressure, ensuring that the wind turbine foundation will not overturn under strong winds, breaking through the limitation of traditional technology where wind turbine foundations only provide anti-overturning capability through gravity.

[0134] The wind turbine generator set provided in this specific embodiment can detect the settlement of the base 1 of the wind turbine foundation through the settlement sensor 5, and automatically adjust the settlement of the wind turbine foundation through the adjusting component 2. This solves the problems of traditional wind turbine foundation leveling, which requires the wind turbine foundation to be excavated again, which is not only time-consuming and labor-intensive, but also prone to causing local damage to the wind turbine foundation. It is not only convenient and quick, but also highly automated.

[0135] The wind turbine foundation construction method provided in this application provides a consolidation grouting method with strong adaptability. It does not require redesigning a new wind turbine foundation according to different foundations. The wind turbine foundation can be obtained simply by following the construction method of this wind turbine foundation, which improves the adaptability of the wind turbine foundation to different foundations and enables the wind turbine foundation to adapt to different strata.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wind turbine foundation, characterized in that, include The substrate is supported on the foundation and at least partially embedded within the foundation; An adjustment assembly is connected between the base and the foundation. The adjustment assembly includes an adjustment component, a pressure regulating device, and a locking mechanism. The adjustment component includes a first housing and a second housing that are dynamically sealed to each other and form a cavity. The first housing is connected to the foundation, and the second housing is connected to the base. The second housing is movably connected to the first housing along a first direction. The locking mechanism is disposed at the connection between the first housing and the second housing, and the locking mechanism can restrict the second housing from moving along the first direction toward the side closer to the first housing. The pressure regulating device communicates with the cavity and is used to adjust the pressure of the fluid in the cavity.

2. The wind turbine foundation according to claim 1, characterized in that, The locking mechanism includes a piston and a guide cylinder. The guide cylinder is connected to the first housing and extends along a first direction. The piston is connected to the second housing and is slidably and sealingly connected to the inner wall of the guide cylinder. The guide cylinder is provided with a guide locking structure to restrict the piston from moving towards the first housing.

3. The wind turbine foundation according to claim 2, characterized in that, The guide locking structure includes a plurality of guide locking portions spaced apart and protruding on the inner wall of the guide cylinder. Each guide locking portion includes a support surface and a guide surface that are connected to each other. The guide surface is set at an acute angle to the first direction, and the piston can slide across the guide surface and support the support surface.

4. The wind turbine foundation according to claim 3, characterized in that, The first housing is provided with a first connecting mechanism, which is placed in the foundation and connected to the base.

5. The wind turbine foundation according to claim 4, characterized in that, The first connecting mechanism includes at least two first connecting portions connected to the first housing, and the center lines of the at least two first connecting portions are intersecting.

6. The wind turbine foundation according to claim 5, characterized in that, The first connecting part includes a connecting body and a first anchor bolt disposed in the connecting body, one end of the first anchor bolt being connected to the first housing and the other end being connected to the connecting body.

7. The wind turbine foundation according to claim 1, characterized in that, The second housing is provided with a second anchor bolt, which is placed in the base and connected to the base.

8. The wind turbine foundation according to claim 1, characterized in that, The adjustment element is provided in multiple parts, and the multiple adjustment elements are equally spaced around the outer periphery of the central axis of the base.

9. The wind turbine foundation according to claim 1, characterized in that, The substrate is provided with a grouting pipe, which is connected to the bottom surface of the substrate.

10. The wind turbine foundation according to claim 1, characterized in that, The wind turbine foundation also includes a curtain structure, which is connected to the bottom surface of the base and surrounds the adjustment member, and is placed in the foundation.

11. A wind turbine generator set, characterized in that, include: The wind turbine foundation as described in any one of claims 1-10; A tower is installed on the wind turbine foundation and connected to the base body; The wind turbine is mounted on the tower.

12. The wind turbine generator set according to claim 11, characterized in that, The wind turbine generator set also includes a settlement sensor, a wind speed sensor, and a controller. The settlement sensor is mounted on the base of the wind turbine foundation, the wind speed sensor is mounted on the wind rotor, and the controller is electrically connected to the wind speed sensor, the settlement sensor, and the pressure regulation device. The controller is configured to control the pressure regulation device to extract fluid from the cavity when the wind speed measured by the wind speed sensor is greater than a first preset value. The controller is also configured to control the pressure regulation device to fill the cavity with fluid when the settlement value measured by the settlement sensor is greater than a second preset value.

13. A construction method for a wind turbine foundation, characterized in that, Includes the following steps: The foundation processing step involves excavating a foundation pit in the stratum to form the foundation; The adjustment component installation steps include providing the adjustment component, which includes an adjustment element and a pressure regulating device. The adjustment element includes a first housing and a second housing that are dynamically sealed to each other. The first housing is connected to the foundation, and the adjustment element is connected to the pressure regulating device through a fluid pipe. The step of pouring the base body involves pouring concrete into the foundation pit to form the base body, and at least a portion of the second shell is poured into the base body.

14. The construction method for a wind turbine foundation according to claim 13, characterized in that, The foundation processing steps include: The foundation pit is formed by excavating the strata. An annular curtain trench was excavated in the foundation. Grout is poured into the curtain trenches to form the curtain structure.

15. The construction method for a wind turbine foundation according to claim 13, characterized in that, The installation steps for the adjustment component include: A first anchor bolt and a second anchor bolt are respectively connected to the first housing and the second housing of the adjusting member; A first hole is made in the foundation; The first housing connected to the first anchor bolt is placed at the first hole, so that the first anchor bolt is set in the first hole; Grout is injected into the first hole to form the first connecting mechanism.

16. The construction method for a wind turbine foundation according to claim 15, characterized in that, The method further includes, prior to the step of placing the first housing with the first anchor bolt attached into the first hole: The foundation where the first hole is located is reinforced.

17. The construction method for a wind turbine foundation according to claim 13, characterized in that, In the step of casting the base, a second hole and a grouting hole are reserved in the base. A second anchor bolt connected to the second shell passes through the second hole and is connected to the base. A grouting pipe is provided in the grouting hole.

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