Fan foundation and wind generating set

Abstract

The invention relates to a draught fan foundation and a wind generating set, the draught fan foundation comprises a base body part, the base body part comprises an annular body and a connecting body, a first opening and a second opening are formed in the annular body in the axial direction of the annular body, the opening area of the first opening is larger than that of the second opening, and the second opening is sealed by the connecting body; a containing cavity is defined by the annular body and the connecting piece, and the containing cavity is filled with a soil body; and the table column body is arranged on the side, where the second opening is located, of the base body part in the axial direction, the table column body comprises a cavity extending in the axial direction, and the table column body is configured to be connected with a tower. According to the fan foundation and the wind generating set provided by the embodiment of the invention, the fan foundation can meet the load requirement of the wind generating set, meanwhile, the material consumption can be reduced, and the construction difficulty and cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a wind turbine foundation and a wind turbine generator set. Background Art

[0002] With the continuous development of the wind power industry, the large-scale wind turbines, super-long blades and high towers have become the recognized development direction in the industry. With the increase of single-unit capacity, the increase of blade running radius and the continuous increase of tower height, the load on the top of the wind turbine foundation has been continuously increased. In order to effectively reduce the pressure on the unit area of ​​the wind turbine foundation, the diameter of the wind turbine foundation has been continuously increased, or the foundation burial depth has been deepened by reducing the pressure difference between the upper and lower surfaces of the foundation.

[0003] In the related technologies, whether it is a natural foundation extension foundation or a pile foundation, almost all of them adopt a large-volume plate foundation form. The force of the wind turbine foundation is mainly borne by the plate body to bear the radial bending moment and the circumferential bending moment. The force mode of the wind turbine foundation determines that the radial bending moment and the circumferential bending moment at the root of the foundation increase with the increase of the foundation diameter, and the thickness at the root of the foundation cantilever also increases continuously. Due to the above reasons, the amount of materials such as steel bars and concrete in the foundation continues to increase, which increases the difficulty of construction and significantly increases the project cost. Summary of the invention

[0004] The embodiments of the present invention provide a wind turbine foundation and a wind turbine generator set. The wind turbine foundation can meet the load requirements of the wind turbine generator set, and can also reduce material usage, construction difficulty and cost.

[0005] On the one hand, according to an embodiment of the present invention, a wind turbine foundation is proposed, including: a base part, including an annular body and a connecting body, the annular body is formed with a first opening and a second opening along its own axial direction, the opening area of ​​the first opening is larger than the opening area of ​​the second opening, the connecting body is arranged to close the second opening, the annular body and the connecting body are enclosed to form a accommodating cavity, and the accommodating cavity is filled with soil; a column body, which is axially arranged on the side where the second opening of the base part is located, the column body includes a cavity extending along the axial direction, and the column body is configured to be connected to a tower.

[0006] According to one aspect of the embodiment of the present invention, along the axial direction, the connecting body is arranged to protrude from the side where the second opening is located to the side where the first opening is located.

[0007] According to one aspect of the embodiment of the present invention, the connector is one of a cone and a pyramid protruding toward the first opening, and a concave cavity is formed on one side of the connector facing the column body in the axial direction, and the concave cavity is filled with filler.

[0008] According to one aspect of the embodiment of the present invention, the connecting body has a tip protruding toward the first opening, and the tip is located on the axis of the annular body.

[0009] According to one aspect of an embodiment of the present invention, the annular body has a first ring body, a second ring body and a shell connected between the first ring body and the second ring body distributed along the axial direction, the radial dimension of the first ring body is greater than the radial dimension of the second ring body, a first opening is formed in the first ring body, a second opening is formed in the second ring body, and a connecting body is connected to the second ring body.

[0010] According to one aspect of the embodiment of the present invention, the first ring body and the second ring body have a predetermined thickness along the axial direction, and the first ring body and the second ring body are coaxially arranged with each other.

[0011] According to one aspect of the embodiments of the present invention, the first ring body, the shell and the second ring body are an integral structure.

[0012] According to one aspect of the embodiments of the present invention, the strength of the first ring body and the second ring body are respectively greater than the strength of at least a partial area of ​​the shell.

[0013] According to one aspect of the embodiments of the present invention, the annular body includes a first steel cage and a first concrete body, and the first concrete body is arranged to cover the first steel cage.

[0014] According to one aspect of the embodiments of the present invention, the content ratio of the first steel cage in the first ring body to the first concrete body in the first ring body is greater than the content ratio of the first steel cage in the shell body to the first concrete body in the shell body; and / or, the content ratio of the first steel cage in the second ring body to the first concrete body in the second ring body is greater than the content ratio of the first steel cage in the shell body to the first concrete body in the shell body.

[0015] According to one aspect of an embodiment of the present invention, the base portion further includes prestressed ribs, a plurality of which are spaced apart along the axial direction, and the prestressed ribs are annular and tensioned on the outer peripheral side of the annular body away from the accommodating cavity.

[0016] According to one aspect of the embodiments of the present invention, the base portion further includes a protective layer, and the outer surface of the annular body facing away from the accommodating cavity is provided with the protective layer, and the protective layer covers each prestressed tendon.

[0017] According to one aspect of the embodiment of the present invention, a protective layer is provided on the inner surface of the annular body facing the accommodating cavity, and the protective layer covers the soil.

[0018] According to one aspect of an embodiment of the present invention, along the axial direction, the cavity includes a first chamber and a second chamber. Along the radial direction of the annular body, the radial dimension of the first chamber is larger than the radial dimension of the second chamber. The second chamber is located on the side of the first chamber away from the base portion.

[0019] On the other hand, according to an embodiment of the present invention, there is provided a wind turbine generator set, comprising: the above-mentioned wind turbine foundation; a tower frame supported on a column body; a connecting cable, one end of which is connected to the tower frame, and the other end of which passes through part of the column body and extends into the cavity, so as to be fixed to the wall of the cavity enclosed by the column body.

[0020] According to another aspect of the embodiment of the present invention, a positioning groove and a fixing body arranged in the positioning groove are arranged on the platform column body, and the tower part extends into the positioning groove and is connected to the platform column body through the fixing body.

[0021] According to the embodiments of the present invention, the wind turbine foundation and the wind turbine generator set provided include a base part and a column body. The column body is used to be connected to the tower. The setting of the internal cavity makes it easy to tension the connecting cable and connect it to the column body when a connecting cable is connected to the tower. Since the base part includes an annular body and a connector, the opening area of ​​the first opening formed by the annular body in its own axial direction is larger than the opening area of ​​the second opening, so that the cross-section of the annular body in the axial direction and toward the side where the column body is located tends to decrease, and the connector closes the second opening and is connected to the annular body to form a accommodating cavity. The soil filled in the accommodating cavity can support the annular body and the connector. When the force of the tower is transmitted to the base part through the column body, the annular body and the connector squeeze the soil, and the soil supports the annular body and the connector upward. Since the opening area of ​​the first opening is larger than the opening area of ​​the second opening, the supporting force given by the annular body, the connector and the soil is There is an angle, and the supporting force is decomposed to form a positive projection on the axial direction X as a normal force along the circumference of the annular body and a radial force along its radial direction. The radial force forms friction with the annular body, and the normal force exerts an out-of-plane thrust on the annular body. Since the annular body is a closed ring, the normal force exerts an outward tensioning effect on the annular body. Compared with the large-volume plate-type fan foundation in the prior art, the force transmission path changes, and the force mode of the plate-type fan foundation in the related technology, which is mainly subjected to bending moment, is changed. On the basis of meeting the load requirements of the fan foundation, the fan foundation of this structural form and the setting of its accommodating cavity can also effectively reduce the amount of materials used, and reduce the construction difficulty and cost of the fan foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0023] Figure 1 is a schematic structural diagram of a wind turbine generator set according to an embodiment of the present invention;

[0024] Figure 2 It is a force diagram of the plate-type fan foundation in the prior art;

[0025] Figure 3 is a structural schematic diagram of a fan foundation according to an embodiment of the present invention;

[0026] Figure 4 is a force diagram of a fan foundation according to an embodiment of the present invention;

[0027] Figure 5 is a structural schematic diagram of a fan foundation according to another embodiment of the present invention;

[0028] Figure 6 is a structural schematic diagram of a fan foundation according to another embodiment of the present invention;

[0029] Figure 7 is a partial cross-sectional view of a first ring body according to an embodiment of the present invention;

[0030] Figure 8 is a partial cross-sectional view of a second ring body according to an embodiment of the present invention;

[0031] Fig. 9 is a partial cross-sectional view of a housing according to an embodiment of the present invention;

[0032] Fig.10 yes Figure 6 A partial enlarged view of point B in the middle.

[0033] in:

[0034] 100-fan foundation; 10-base; 11-annular body; 11a-first ring body; 11b-second ring body; 11c-housing; 11d-first opening; 11e-second opening; 11f-annular groove; 111a-first steel bar ring; 111b-second steel bar ring; 111c-transition steel bar ring; 112a-first part; 112b-second part; 112c-transition part;

[0035] 12-connector; 121-tip; 13-accommodating cavity; 14-soil; 15-filler; 16-prestressed tendons; 17-protective layer;

[0036] 20-column body; 21-cavity; 211-first chamber; 212-second chamber; 22-positioning groove; 23-fixed body;

[0037] 200-tower; 300-nacelle; 400-generator; 500-impeller; 510-hub; 520-blade;

[0038] 600-connecting rope;

[0039] X-axial direction; Y-circumferential direction.

[0040] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0041] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least part of the known structures and technologies are not shown in order to avoid unnecessary ambiguity of the present invention; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0042] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the wind turbine foundation and wind turbine generator set of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0043] Figure 1 As shown, the embodiment of the present application provides a wind turbine generator set, including a wind turbine foundation 100, a tower 200, a nacelle 300, a generator 400 and an impeller 500. The tower 200 is connected to the wind turbine foundation 100, the nacelle 300 is arranged at the top of the tower 200, and the generator 400 is arranged in the nacelle 300. In some examples, the generator 400 can be located outside the nacelle 300. Of course, in some examples, the generator 400 can also be located inside the nacelle 300. The impeller 500 includes a hub 510 and a plurality of blades 520 connected to the hub 510. The impeller 500 is connected to the rotor of the generator 400 through the hub 510, thereby driving the rotor to rotate relative to the stator to achieve the power generation demand of the wind turbine generator set.

[0044] With the continuous development of the wind power industry, the large-scale wind turbine generator set, the super-lengthened blades 520, and the increased height of the tower 200 have become the recognized development direction in the industry. With the increase in the capacity of a single unit, the lengthening of the operating radius of the blades 520, and the continuous increase in the height of the tower 200, the load on the top of the wind turbine foundation 100 continues to increase. In order to effectively reduce the pressure on the unit area of ​​the wind turbine foundation 100, the diameter of the wind turbine foundation 100 is continuously increased, or the foundation burial depth is deepened by reducing the pressure difference between the upper and lower surfaces of the foundation.

[0045] like Figure 2As shown, in the related art, whether it is a natural foundation extension foundation or a pile foundation, a large-volume plate foundation form is almost always used. When the wind turbine foundation 100 is subjected to force F, under the reaction force of the soil, the plate wind turbine foundation form mainly bears radial bending moment and circumferential bending moment. The force mode of the wind turbine foundation 100 determines that the radial bending moment and circumferential bending moment at the root of the foundation increase with the increase of the foundation diameter, and the thickness at the root of the foundation cantilever also increases continuously. Due to the above reasons, the amount of materials such as steel bars and concrete used in the foundation continues to increase, which increases the difficulty of construction and significantly increases the project cost.

[0046] Based on the above technical problems, an embodiment of the present application provides a wind turbine foundation 100, which can meet the load requirements of the wind turbine generator set, while reducing material consumption, construction difficulty and cost.

[0047] like Figure 3 As shown, a wind turbine foundation 100 provided by an embodiment of the present application includes a base portion 10 and a column body 20. The base portion 10 includes an annular body 11 and a connecting body 12. The annular body 11 is formed with a first opening 11d and a second opening 11e along its own axial direction X. The opening area of ​​the first opening 11d is larger than the opening area of ​​the second opening 11e. The connecting body 12 is arranged to close the second opening 11e. The annular body 11 and the connecting body 12 are enclosed to form a receiving cavity 13, and the receiving cavity 13 is filled with soil 14. The column body 20 is arranged on the side of the second opening 11e of the base portion 10 along the axial direction X. The column body 20 includes a cavity 21 extending along the axial direction X. The column body 20 is configured to be connected to the tower 200.

[0048] Optionally, the annular body 11 may be in a circular ring shape or a polygonal ring shape. In order to better understand the wind turbine foundation 100 provided in an embodiment of the present application, the annular body 11 may be in a circular ring shape for illustration.

[0049] Along the axial direction X of the annular body 11 , the first opening 11 d and the second opening 11 e may both have a certain depth, and the connector 12 may be connected to the wall surface of the annular body 11 enclosing the second opening 11 e .

[0050] The opening area of ​​the first opening 11d can be understood as: the area of ​​the orthographic projection shape of the wall surface of the annular body 11 enclosing the first opening 11d along the axial direction X. If the orthographic projection shape of the wall surface enclosing the first opening 11d is a circle, then it is the area of ​​the circle.

[0051] The opening area of ​​the second opening 11e can be understood as: the area of ​​the orthographic projection shape of the wall surface of the annular body 11 enclosing the second opening 11e along the axial direction X. If the orthographic projection shape of the wall surface enclosing the second opening 11e is a circle, then it is the area of ​​the circle.

[0052] The connector 12 is arranged to close the second opening 11e. When the second opening 11e has a certain depth, the connector 12 can be connected to the wall surface of the annular body 11 that encloses the second opening 11e. It can be connected to the top end, bottom end or the area between the two ends of the wall surface in the axial direction X, which can be understood as a closed second opening 11e.

[0053] The connecting body 12 may be arranged horizontally. Of course, the connecting body 12 may be arranged to protrude along the axial direction X on the side where the first opening 11 d is located.

[0054] like Figure 3 as well as Figure 4 As shown, a wind turbine foundation 100 provided by an embodiment of the present application has a column body 20 configured to be connected to a tower 200, and a configuration of an internal cavity 21 thereof facilitates tensioning of the connecting cable 600 and connection with the column body 20 when a connecting cable 600 is connected to the tower 200.

[0055] Since the base part 10 includes the annular body 11 and the connecting body 12, the opening area of ​​the first opening 11d formed on the annular body 11 in its own axial direction X is larger than the opening area of ​​the second opening 11e, so that the cross section of the annular body 11 in the axial direction X and toward the side where the column body 20 is located tends to decrease, and the connecting body 12 is arranged to close the second opening 11e and is connected to the annular body 11 to form a receiving cavity 13. The soil 14 filled in the receiving cavity 13 can support the annular body 11 and the connecting body 12. When the force F applied to the tower 200 is transmitted to the base part 10 through the column body 20, the annular body 11 and the connecting body 12 exert force on the soil 14. The soil 14 pushes the annular body 11 and the connecting body 12 upward. Since the opening area of ​​the first opening 11d is larger than the opening area of ​​the second opening 11e, the annular body 11 and the connecting body 12 have an angle with the supporting force given by the soil 14. The supporting force is decomposed into a normal force F1 along the circumferential direction Y of the annular body 11 and a radial force F2 along its radial direction. The radial force F2 forms friction with the annular body 11, and the normal force F1 forms an out-of-plane thrust on the annular body 11. Since the annular body 11 is a closed ring, the normal force F1 forms an outward tensioning effect on the annular body 11. Compared with the prior art, Figure 2 The large-volume plate-type fan foundation 100 shown in the figure has a changed force transmission path, which changes the force mode of the plate-type fan foundation 100 in the related technology, which is mainly subjected to bending moment. On the basis of meeting the load requirements of the fan foundation 100, the fan foundation 100 of this structural form, the setting of the accommodating cavity 13 can also effectively reduce the amount of molding materials used, and reduce the construction difficulty and cost of the fan foundation 100.

[0056] In some optional embodiments, in a wind turbine foundation 100 provided by an embodiment of the present application, along the axial direction X of the annular body 11, the connecting body 12 is protruded from the side where the second opening 11e is located to the side where the first opening 11d is located.

[0057] The orthographic projection shape of the connecting body 12 in the axial direction X can match the orthographic projection shape of the side wall of the annular body 11 enclosing the second opening 11 e in the axial direction X. The connecting body 12 and the annular body 11 can be an integral structure.

[0058] like Figure 3 as well as Figure 5 As shown, the connector 12 may be in the shape of a cone, a pyramid, a part of an ellipsoid, or a part of a sphere.

[0059] A wind turbine foundation 100 provided by an embodiment of the present application is configured such that along the axial direction X of the annular body 11, the connecting body 12 protrudes from the side where the second opening 11e is located to the side where the first opening 11d is located, so that when the force applied to the tower 200 is transmitted to the connecting body 12 and acts on the soil 14, the connecting body 12 is subjected to pressure in the circumferential direction Y and radial direction of the annular body 11, thereby further dispersing the force transmitted by the tower 200, ensuring the bearing function of the wind turbine foundation 100, and effectively reducing the size of the wind turbine foundation 100 and the amount of molding material used.

[0060] like Figure 6 As shown, in some optional embodiments, in a wind turbine foundation 100 provided by an embodiment of the present application, the connecting body 12 is one of a cone and a pyramid that is protruding toward the first opening 11d. The connecting body 12 forms a concave cavity on one side facing the column body 20 in the axial direction X, and the concave cavity is filled with a filler 15.

[0061] The connecting body 12 may be in the form of a cone protruding toward the first opening 11d, or, of course, a pyramid protruding toward the first opening 11d.

[0062] The filler 15 in the cavity can be backfill soil. Of course, other fillers 15 such as sand and gravel, or a mixture of sand and gravel and backfill soil can also be used.

[0063] In the wind turbine foundation 100 provided in one embodiment of the present application, the connecting body 12 adopts a structure such as a cone, which can ensure the dispersion of the force transmitted by the tower 200 on the soil 14 to form a reaction force on the wind turbine foundation 100. The concave cavity of the connecting body 12 is filled with a filler 15, which can achieve the effect of leveling the top of the base and ensure the internal construction requirements of the column body 20.

[0064] In some optional embodiments, the connecting body 12 has a tip 121 protruding toward the first opening 11 d , and the tip 121 is located on the axis aa of the annular body 11 .

[0065] Optionally, the distance from the tip 121 to each part of the outer periphery of the connecting body 12 can be made equal. In the wind turbine foundation 100 provided by one embodiment of the present application, the tip 121 formed by the protrusion of the connecting body 12 is located on the axis aa of the annular body 11, so that the connecting body 12 can be a cone with a regular shape. The bearing capacity of each part is uniform, the uniformity of the overall force of the wind turbine foundation 100 is ensured, and its safety performance is improved.

[0066] like Figures 3 to 6 As shown, in some optional embodiments, a wind turbine foundation 100 provided by an embodiment of the present application, the annular body 11 has a first ring body 11a, a second ring body 11b and a shell 11c connected between the first ring body 11a and the second ring body 11b distributed along the axial direction X, the radial dimension of the first ring body 11a is greater than the radial dimension of the second ring body 11b, a first opening 11d is formed in the first ring body 11a, a second opening 11e is formed in the second ring body 11b, and the connecting body 12 is connected to the second ring body 11b.

[0067] In a wind turbine foundation 100 provided by an embodiment of the present application, the annular body 11 adopts the above-mentioned structural form, and the boundary of the shell 11c can be constrained by the first ring body 11a and the second ring body 11b, and the two sides of the shell 11c are constrained by the first ring body 11a, which is beneficial to the molding of the annular body 11 and can ensure the strength requirements of the annular body 11.

[0068] Optionally, the first ring body 11a and the second ring body 11b may be circular ring bodies, and in some optional examples, they may also be polygonal ring bodies, and when they are polygonal ring bodies, they may be regular polygonal ring bodies, so as to ensure uniformity of force.

[0069] Optionally, the shell 11c is in the shape of a closed ring in the circumferential direction Y, and may be in the shape of a cone, such as a circular cone or a pyramid.

[0070] Optionally, one end of the shell 11c can be connected to the upper surface of the first ring body 11a in the axial direction X, and the other end of the shell 11c can be connected to the lower surface of the second ring body 11b in the axial direction X, or to the outer peripheral surface of the second ring body 11b. This can ensure the connection requirements between the shell 11c and the first ring body 11a and the second ring body 11b, and at the same time provide a setting space for the connector 12 and ensure the connection requirements between it and the second ring body 11b.

[0071] In a wind turbine foundation 100 provided by one embodiment of the present application, the first ring body 11a and the second ring body 11b have a predetermined thickness along the axial direction X, and the first ring body 11a and the second ring body 11b are coaxially arranged with each other.

[0072] The thicknesses of the first ring body 11a and the second ring body 11b in the axial direction X may be equal. Of course, in the axial direction X, the thickness of one of the first ring body 11a and the second ring body 11b may be greater than the thickness of the other.

[0073] The fan foundation 100 provided in the embodiment of the present application can ensure the strength of the annular body 11 at the first ring body 11a and the second ring body 11b through the above arrangement. The first ring body 11a and the second ring body 11b are coaxially arranged to ensure uniform force.

[0074] In some optional embodiments, in a wind turbine foundation 100 provided by an embodiment of the present application, the first ring body 11a, the shell 11c and the second ring body 11b are an integrated structure.

[0075] Through the above arrangement, the connection strength and overall performance between the first ring body 11a, the second ring body 11b and the shell 11c can be ensured. At the same time, the above arrangement is conducive to the molding of the annular body 11.

[0076] In some optional embodiments, the annular body 11 and the connector 12 may be an integrated structure. The wind turbine foundation 100 provided in one embodiment of the present application can ensure the integrity of the base 10 and improve the safety of the wind turbine foundation 100 through the above configuration.

[0077] In some optional embodiments, in a wind turbine foundation 100 provided by an embodiment of the present application, the strength of the first ring body 11a and the second ring body 11b are respectively greater than the strength of at least a partial area of ​​the shell 11c.

[0078] The first ring body 11a and the second ring body 11b may have a strength greater than that of the entire area of ​​the shell 11c, and of course, may also have a strength greater than that of a partial area of ​​the shell 11c.

[0079] In the fan foundation 100 provided by one embodiment of the present application, the base part 10 bears a large force at both ends of the axial direction X, and needs to bear the boundary constraint requirement of the shell 11c. By locally reinforcing the annular body 11 at the first ring body 11a and the second ring body 11b, the load bearing requirements of the fan foundation 100 can be guaranteed. At the same time, the strength of the partial area of ​​the shell 11c can be set relatively low, saving the use of molding materials.

[0080] In some optional embodiments, in the wind turbine foundation 100 provided in the above embodiments of the present application, the annular body 11 includes a first steel cage and a first concrete body, and the first concrete body is arranged to cover the first steel cage.

[0081] The annular body 11 can be formed by pouring concrete using a steel cage as a framework.

[0082] The first steel cage may be formed by binding together a plurality of steel bars extending in different directions, and the whole may be in the shape of a hollow ring.

[0083] The fan foundation 100 provided in one embodiment of the present application adopts the above-mentioned structural form, which can not only ensure the molding requirements of the fan foundation 100 and reduce the molding difficulty, but also utilize the good compressive resistance of concrete to optimize the performance of the fan foundation 100.

[0084] like Figures 7 to 9 As shown, the first steel cage may include a first steel ring 111a, a second steel ring 111b and a transition steel ring 111c connected between the first steel ring 111a and the second steel ring 111b in the axial direction X, and the first concrete body may include a first portion 112a, a second portion 112b and a transition portion 112c connected between the first portion 112a and the second portion 112b in the axial direction X. The first portion 112a may cover the first steel ring 111a, and the first ring body 11a includes the first portion 112a and the first steel ring 111a. The second portion 112b covers the second steel ring 111b, and the second ring body 11b includes the second portion 112b and the second steel ring 111b. The transition portion 112c covers the transition steel ring 111c, and the shell 11c includes the transition portion 112c and the transition steel ring 111c.

[0085] The wind turbine foundation 100 provided in one embodiment of the present application, through the above-mentioned configuration, enables each part of the annular body 11 to be supported by steel bars and concrete, which is conducive to molding and has strong compressive resistance.

[0086] In some optional embodiments, the content ratio of the first steel cage in the first ring body 11a to the first concrete body in the first ring body 11a is greater than the content ratio of the first steel cage in the shell 11c to the first concrete body in the shell 11c.

[0087] In some optional embodiments, the content ratio of the first steel cage in the second ring body 11b to the first concrete body in the second ring body 11b is greater than the content ratio of the first steel cage in the shell 11c to the first concrete body 14 in the shell 11c.

[0088] Through the above configuration, the strength of the first ring body 11a and the strength of the second ring body 11b can be made greater than the strength of at least part of the shell 11c by increasing the content of steel bars in the first ring body 11a and by increasing the content of steel bars in the second ring body 11b, thereby ensuring the boundary constraints of the shell 11c and the load bearing requirements of the wind turbine foundation 100.

[0089] like Fig.10 As shown, in some optional embodiments, a wind turbine foundation 100 provided by an embodiment of the present application, the base portion 10 also includes prestressed tendons 16, and a plurality of prestressed tendons 16 are arranged at intervals along the axial direction X. The prestressed tendons 16 are annular and tensioned on the outer peripheral side of the annular body 11 away from the accommodating cavity 13.

[0090] The number of prestressed tendons 16 included in the base portion 10 may be two, three or more. Each prestressed tendon 16 is annular, and the plurality of prestressed tendons 16 may be distributed at intervals along the axial direction X of the annular body 11 .

[0091] The wind turbine foundation 100 provided in one embodiment of the present application is provided with a plurality of prestressed tendons 16 on the base portion 10, and the prestressed tendons 16 are tensioned on the outer peripheral side of the annular body 11 away from the accommodating cavity 13, so that the annular body 11 can be in a compressed state under the action of the prestressed tendons 16. The annular body 11 forms an arch effect, and this effect prevents the prestressing effect of the prestressed tendons 16 on the annular body 11 from becoming a control condition, so that the prestressing effect of the prestressed tendons 16 can effectively balance the tensioning effect of the soil 14 on the shell 11c. Based on the above-mentioned action offset, the overall steel reinforcement amount of the first steel cage in the annular body 11 is significantly reduced, which can further reduce the cost and construction difficulty of the wind turbine foundation 100.

[0092] In some optional embodiments, prestressed tendons 16 may be provided on the periphery of at least one of the first ring body 11a, the shell 11c, and the second ring body 11b. In some optional embodiments, prestressed tendons 16 may be provided on the peripheries of both the first ring body 11a and the shell 11c. Through the above arrangement, the tensioning effect of the soil 14 borne by the shell 11c can be effectively balanced to ensure the safety of the wind turbine foundation 100.

[0093] like Figure 6 , Fig.10 As shown, in some optional embodiments, the wind turbine foundation 100 provided in some embodiments of the present application may be provided with an annular groove 11f on the outer periphery of the annular body 11, and the annular groove 11f may be recessed in the outer peripheral surface of the wind turbine foundation 100, and each prestressed tendon 16 is clamped in one of the annular grooves 11f.

[0094] A wind turbine foundation 100 provided in an embodiment of the present application has an annular groove 11f disposed on the outer periphery of the wind turbine foundation 100, which is beneficial for binding prestressed tendons 16 on the outer periphery of the annular body 11 after forming the annular body 11, and is beneficial for limiting the prestressed tendons 16, thereby ensuring the balance requirement of the tensioning effect.

[0095] In some optional embodiments, an embodiment of the present application provides a wind turbine foundation 100, and an annular tube can be pre-buried on the outer periphery of the annular body 11, and the annular tube can at least partially extend into the annular body 11 from the outer periphery of the annular body 11. After the annular body 11 is formed, the prestressed tendons 16 can be inserted into the annular tube and tensioned and fixed. The matching requirements with the annular body 11 can also be guaranteed, thereby ensuring the balance requirements for the tensioning effect.

[0096] In some optional embodiments, a wind turbine foundation 100 provided by an embodiment of the present application, the base portion 10 also includes a protective layer 17, and the outer surface of the annular body 11 facing away from the accommodating cavity 13 is provided with the protective layer 17, and the protective layer 17 covers each prestressed tendon 16.

[0097] Optionally, the protective layer 17 may be formed by concrete pouring.

[0098] A wind turbine foundation 100 provided in an embodiment of the present application is provided with a protective layer 17 on the outer surface of the annular body 11 away from the accommodating cavity 13, and the protective layer 17 covers each prestressed tendon 16. The protective layer 17 can be used to seal and protect the prestressed tendons 16, thereby reducing the probability of wear and corrosion of the prestressed tendons 16, and improving the overall safety and service life of the wind turbine foundation 100.

[0099] In some optional embodiments, in a wind turbine foundation 100 provided by an embodiment of the present application, a protective layer 17 is provided on the inner surface of the annular body 11 facing the accommodating cavity 13 , and the protective layer 17 is provided to cover the soil 14 .

[0100] A wind turbine foundation 100 provided in one embodiment of the present application is configured with a protective layer 17 on the inner surface of the annular body 11 facing the accommodating cavity 13, and the protective layer 17 is configured to cover the soil 14, thereby shaping the soil 14 and providing a working surface for the molding of the annular body 11.

[0101] like Figures 3 to 6 As shown, in some optional embodiments, a wind turbine foundation 100 provided by an embodiment of the present application, along the axial direction X of the annular body 11, the cavity 21 includes a first chamber 211 and a second chamber 212, and along the radial direction of the annular body 11, the radial dimension of the first chamber 211 is greater than the radial dimension of the second chamber 212, and the second chamber 212 is located on the side of the first chamber 211 away from the base portion 10.

[0102] Optionally, the cavity 21 as a whole can be a stepped cavity. A transition surface is provided between the first cavity 211 and the second cavity 212 .

[0103] Optionally, the column body 20 may include a first barrel section 20a and a second barrel section 20b along the axial direction X, the first barrel section 20a includes a first chamber 211, the second barrel section 20b includes a second chamber 212, and the first barrel section 20a and the second barrel section 20b may be integrally formed.

[0104] Optionally, the column body 20 may include a second steel cage and a second concrete body.

[0105] Optionally, when the annular body 11 includes a first steel cage and a first concrete body, the first steel cage and the second steel cage can be an integrated structure, and the first concrete body and the second concrete body can be an integrated structure. Through the above arrangement, the integrity of the wind turbine foundation 100 can be ensured, and the forming of the wind turbine foundation 100 is facilitated.

[0106] Optionally, when the wind turbine foundation 100 of the above-mentioned embodiments is being formed, the steps of excavating the main body of the foundation pit, shaping the foundation, pouring the concrete cushion layer, tying steel bars, pouring concrete, curing steel bars and concrete, constructing the protective layer 17, and backfilling the soil can be carried out to realize the construction of the wind turbine foundation 100.

[0107] The wind turbine foundation 100 provided in one embodiment of the present application can reduce the amount of engineering materials used, thereby reducing engineering costs. Reduce the volume of continuously poured concrete, shorten the continuous construction time, and improve the quality of the project. It has technical and cost advantages in sandy and soft soil areas such as "Shagohuang". The soil body 14 and the shell 11c part form an embolism effect, which improves the foundation's anti-overturning ability and can effectively prevent the structure from overturning due to the migration of the soil body 14 in the "Shagohuang" area. After the service life of the wind turbine generator set expires, the cavity 21 of this foundation can be used as a water cellar after simple waterproofing treatment and the addition of an upper cover plate, thereby improving the role of the wind turbine generator set during its post-service period.

[0108] The wind turbine generator set provided in the embodiments of the present application, including the wind turbine foundation 100 provided in the above embodiments, can not only ensure the support of large components such as the tower 200, the nacelle 300, and the impeller 500, but also reduce the amount of molding materials used in the wind turbine foundation 100, reduce the construction difficulty, and thus effectively reduce costs and ensure power generation efficiency.

[0109] In some optional embodiments, the wind turbine generator set provided in one embodiment of the present application may further include a connecting cable 600, one end of which is connected to the tower 200, and the other end of which penetrates a portion of the column body 20 and extends into the cavity 21, so as to be fixed to the wall surface of the column body 20 enclosing the cavity 21. When there is a transition surface between the first cavity 211 and the second cavity 212, the connecting cable 600 is tensioned on the transition surface.

[0110] The wind turbine generator set provided by one embodiment of the present application, through the above-mentioned configuration, enables the wind turbine foundation 100 to be suitable for connection to the support of the hybrid tower 200 including the steel tower section and the concrete tower section.

[0111] like Figures 2 to 6 As shown, in some optional embodiments, a wind turbine generator set provided in one embodiment of the present application has a positioning groove 22 and a fixing body 23 disposed in the positioning groove 22 on the column body 20, and the tower 200 partially extends into the positioning groove 22 and is connected to the column body 20 through the fixing body 23. The positioning of the tower 200 and the stability of the connection are ensured.

[0112] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fan foundation, characterized in that: include: The base part includes an annular body and a connecting body, wherein the annular body is provided with a first opening and a second opening along its axial direction, wherein the opening area of ​​the first opening is larger than the opening area of ​​the second opening, and the connecting body is provided to close the second opening, wherein the annular body and the connecting body are combined to form a receiving cavity, and the receiving cavity is filled with soil; A column body is arranged along the axial direction at the side where the second opening of the base part is located, the column body includes a cavity extending along the axial direction, and the column body is configured to be connected to the tower.

2. The wind turbine foundation according to claim 1, characterized in that: Along the axial direction, the connecting body is protruded from the side where the second opening is located to the side where the first opening is located.

3. The wind turbine foundation according to claim 2, characterized in that: The connecting body is in the form of one of a cone and a pyramid that is protruding toward the first opening. The connecting body forms a concave cavity on one side of the connecting body that faces the column body in the axial direction. The concave cavity is filled with fillers.

4. The wind turbine foundation according to claim 2, characterized in that: The connecting body has a tip protruding toward the first opening, and the tip is located on the axis of the annular body.

5. The wind turbine foundation according to claim 1, characterized in that: The annular body comprises a first ring body, a second ring body and a shell connected between the first ring body and the second ring body distributed along the axial direction, the radial dimension of the first ring body is greater than the radial dimension of the second ring body, the first opening is formed in the first ring body, the second opening is formed in the second ring body, and the connecting body is connected to the second ring body.

6. The wind turbine foundation according to claim 5, characterized in that: The first ring body and the second ring body have a predetermined thickness along the axial direction, and the first ring body and the second ring body are coaxially arranged with each other; And / or, the first ring body, the shell and the second ring body are an integrated structure.

7. The wind turbine foundation according to claim 5, characterized in that: The strength of the first ring body and the second ring body are respectively greater than the strength of at least a partial area of ​​the shell.

8. The wind turbine foundation according to claim 5, characterized in that: The annular body includes a first steel cage and a first concrete body, and the first concrete body is arranged to cover the first steel cage.

9. The wind turbine foundation according to claim 8, characterized in that: The proportion of the first steel cage in the first ring body to the first concrete body in the first ring body is greater than the proportion of the first steel cage in the shell body to the first concrete body in the shell body; And / or, the content ratio of the first steel cage in the second ring body to the first concrete body in the second ring body is greater than the content ratio of the first steel cage in the shell body to the first concrete body in the shell body.

10. The wind turbine foundation according to claim 1, characterized in that: The base portion further comprises prestressed ribs, a plurality of which are arranged at intervals along the axial direction, and the prestressed ribs are annular and tensionedly arranged on the outer peripheral side of the annular body away from the accommodating cavity.

11. The wind turbine foundation according to claim 10, characterized in that: The base portion also includes a protective layer, and the protective layer is provided on the outer surface of the annular body facing away from the accommodating cavity, and the protective layer covers each of the prestressed tendons; and / or, the protective layer is provided on the inner surface of the annular body facing the accommodating cavity, and the protective layer covers the soil.

12. The wind turbine foundation according to claim 10, characterized in that: Along the axial direction, the cavity includes a first chamber and a second chamber. Along the radial direction of the annular body, the radial size of the first chamber is larger than the radial size of the second chamber. The second chamber is located on a side of the first chamber away from the base portion.

13. A wind turbine generator set, characterized in that: include: The wind turbine foundation according to any one of claims 1 to 12; A tower frame, supported on the column body; A connecting rope has one end connected to the tower and the other end passing through a portion of the platform column and extending into the cavity, so as to be fixed to the wall of the cavity enclosed by the platform column.

14. The wind turbine generator set according to claim 13, characterized in that: The platform column body is provided with a positioning groove and a fixing body arranged in the positioning groove, and the tower frame part extends into the positioning groove and is connected with the platform column body through the fixing body.

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