Fan foundation and construction method and wind turbine generator set

Abstract

The application provides a fan foundation, a construction method and a wind turbine generator set. The fan foundation comprises an extended bearing platform, a support ring arranged at the bottom of the extended bearing platform, the support ring being an annular structure extending in the up-down direction, and a plurality of support piles arranged at the bottom of the support ring in the circumferential direction of the support ring, the support ring and the support piles being located below the ground. Therefore, the fan foundation has the advantages of low construction cost and stable structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation foundation technology, in particular to a wind turbine foundation and construction method and wind turbine generator. BACKGROUND

[0002] In the related art, the platform of the wind power generation foundation includes a plurality of pile bodies below, and the stress of each pile body is single stress, so that the stress requirement of the single pile body is high, thereby the length of the pile body is long, the material used is much and the engineering quantity is large, and the construction cost is high. SUMMARY

[0003] The present application is based on the discovery and understanding of the inventors on the following facts and problems: through stress analysis of the plurality of pile bodies below the platform of the wind power generation foundation, it is found that the upper part of each pile body has large stress, and since each pile body is single stress, the requirement of the single pile body is high, and the length is long, thereby the construction cost is high.

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, the embodiments of the present application propose a wind turbine foundation and construction method and wind turbine generator.

[0005] The wind turbine foundation of the embodiments of the present application comprises:

[0006] an extended pile cap;

[0007] a support ring, the support ring is arranged at the bottom of the extended pile cap, and the support ring is an annular structure extending in the up-down direction;

[0008] a plurality of support piles, the plurality of support piles are arranged at the bottom of the support ring in the circumferential direction of the support ring, and the support ring and the support piles are both located below the ground.

[0009] Therefore, the wind turbine foundation according to the embodiments of the present application has the advantages of low construction cost and stable structure.

[0010] In some embodiments, the size of the support pile in the up-down direction is less than 1 times the size of the support ring in the up-down direction.

[0011] In some embodiments, the size of the support pile in the up-down direction is greater than or equal to 4 meters and less than or equal to 7 meters, and the size of the support ring in the up-down direction is greater than or equal to 6 meters and less than or equal to 9 meters.

[0012] In some embodiments, the extended pile cap, the support ring and the support piles are all casted by concrete;

[0013] the thickness of the support ring is greater than or equal to 500mm, and the concrete strength grade of the support ring is greater than or equal to C15.

[0014] The diameter of the support pile is greater than or equal to 300 mm, and the concrete strength grade of the support pile is greater than or equal to C20.

[0015] The fan foundation of the embodiment of the application comprises a first reinforcing member, a first section of the first reinforcing member is located in the extended pile cap, a second section of the first reinforcing member is located in the support ring, and a third section of the first reinforcing member is located in the support pile, and the first section, the second section and the third section of the first reinforcing member are sequentially connected from top to bottom.

[0016] In some embodiments, the support ring comprises a plurality of first engagement piles and a plurality of second engagement piles, the first engagement piles and the second engagement piles are alternately arranged along the circumference of the support ring, the second section of the first reinforcing member is arranged in the second engagement piles, and each of the plurality of second engagement piles is connected with one of the plurality of support piles, and the second engagement pile is located directly above the corresponding support pile.

[0017] In some embodiments, the support ring is formed by pouring a concrete form, the concrete form comprises a first annular form and a second annular form, the first annular form is sleeved on the outer circumferential side of the second annular form, the first annular form and the second annular form define a pouring cavity for pouring concrete, the support ring is provided with a second reinforcing member, the second reinforcing member is annular and located between the inner and outer annular surfaces of the support ring, and the second reinforcing member is located directly above the plurality of support piles.

[0018] In some embodiments, the extended pile cap is disc-shaped, the upper and lower surfaces of the extended pile cap are horizontal surfaces, the support ring is a circular ring structure, and the outer diameter of the extended pile cap is greater than the outer diameter of the support ring.

[0019] The diameter of the extended pile cap is greater than or equal to 8 meters and less than or equal to 14 meters.

[0020] The diameter of the support pile is less than or equal to the thickness of the support ring.

[0021] The application further provides a wind turbine generator set comprising the fan foundation of the embodiment of the application.

[0022] The application further provides a construction method for implementing the fan foundation of the embodiment of the application, comprising the following steps:

[0023] S1, a first borehole extending downwardly is provided and concrete is poured into the first borehole to form a first bite pile, a second borehole extending downwardly is provided, and after a reinforcing member is arranged in the second borehole, concrete is poured into the second borehole to form a support pile and a second bite pile located above the support pile, the first bite pile and the second bite pile are poured in sequence and alternately in a circumferential direction to form a support ring located above the support pile;

[0024] S2, a plurality of third boreholes extending downwardly are provided, a reinforcing member is arranged in each of the third boreholes and concrete is poured into the third boreholes to form a plurality of support piles arranged in a circumferential direction at intervals, a concrete formwork is arranged on top of the plurality of support piles, and after a reinforcing member is arranged in an annular pouring cavity of the concrete formwork, concrete is poured into the pouring cavity to form an annular support ring;

[0025] S3, an extended pile cap is poured using concrete on the support ring, and a reinforcing member in the extended pile cap is connected to a reinforcing member in the support ring;

[0026] The step S3 is implemented after one of the steps S1 and S2 is implemented. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a front view of a fan foundation according to an embodiment of the present application.

[0028] Figure 2 is a top view of a support pile according to an embodiment of the present application.

[0029] Figure 3 is a schematic view of a fan foundation according to an embodiment of the present application.

[0030] REFERENCE NUMERALS:

[0031] fan foundation 100;

[0032] extended pile cap 1;

[0033] support ring 2, first bite pile 21, second bite pile 22;

[0034] support pile 3;

[0035] first reinforcing member 4, first section 41, second section 42, third section 43. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0037] A wind turbine foundation 100 according to an embodiment of the present application is described below with reference to the accompanying drawings. As shown in Figures 1 to 3 The wind turbine foundation 100 according to the embodiment of the present application comprises an extended pile cap 1, a support ring 2 and a plurality of support piles 3.

[0038] The support ring 2 is arranged at the bottom of the extended pile cap 1, and the support ring 2 is an annular structure extending in the up-down direction. The plurality of support piles 3 are arranged at the bottom of the support ring 2 in the circumferential direction of the support ring 2, and the support ring 2 and the support piles 3 are both located below the ground.

[0039] The present application is based on the discovery and realization of the inventors on the following facts and problems: through force analysis on the plurality of piles below the platform of the wind turbine foundation, it is found that the upper part of each pile bears a large force, and the requirement for each pile is high due to the single force bearing of each pile, the length of each pile is long, and thus the construction cost is high.

[0040] The wind turbine foundation 100 according to the embodiment of the present application can make the support ring 2 located above the support piles 3 bear most of the pressure from the extended pile cap 1 and the components above the extended pile cap 1 by arranging the combined structure of the support ring 2 and the support piles 3 below the extended pile cap 1, the support ring 2 is an annular structure, and thus the structure of the support ring 2 is more stable and less likely to be crushed, the support strength of the support ring 2 structure of the same height is greater than that of the pile of the same height, and thus the stability of the wind turbine foundation 100 can be improved, and the plurality of support piles 3 arranged at intervals are arranged at the lower part of the support ring 2, so that the plurality of support piles 3 can share part of the pressure from the components above the extended pile cap 1, and the cost of the support piles 3 is lower than that of the support ring 2. Compared with bearing the extended pile cap 1 and the components above the extended pile cap 1 by a single cylindrical structure or a plurality of pile structures, arranging the combined structure of the support ring 2 and the support piles 3 below the extended pile cap 1 can make the wind turbine foundation 100 have low construction cost and stable structure.

[0041] Therefore, the wind turbine foundation 100 according to the embodiment of the present application has the advantages of low construction cost and stable structure.

[0042] As shown in Figures 1 to 3 The wind turbine foundation 100 according to the embodiment of the present application comprises an extended pile cap 1, a support ring 2 and a plurality of support piles 3, and the extended pile cap 1, the support ring 2 and the support piles 3 are all casted by concrete.

[0043] As shown in Figure 1 and Figure 3 The extended pile cap 1 is disc-shaped, and the upper surface and the lower surface of the extended pile cap 1 are both horizontal planes. Specifically, the diameter (outer diameter) of the extended pile cap 1 is greater than or equal to 8 meters and less than or equal to 14 meters. The axial direction of the extended pile cap 1 is the up-down direction, as indicated by the arrow in Figure 1 For example, the diameter (outer diameter) of the extended pile cap 1 is 12 meters.

[0044] As shown in Figure 1 and Figure 3 , the support ring 2 is arranged at the bottom of the extended pile cap 1, and the support ring 2 is an annular structure extending in the up-down direction. Specifically, the support ring 2 is a circular annular structure, and the outer diameter of the extended pile cap 1 is greater than the outer diameter of the support ring 2. Thus, the support ring 2 can be used to support the extended pile cap 1.

[0045] In some embodiments, the thickness of the support ring 2 is greater than or equal to 500 mm, and the concrete strength grade of the support ring 2 is greater than or equal to C15, so as to ensure the structural strength of the support ring 2.

[0046] A plurality of support piles 3 are arranged at the bottom of the support ring 2 in the circumferential direction of the support ring 2, and the support ring 2 and the support piles 3 are both located below the ground. The diameter of the support pile 3 is less than or equal to the thickness of the support ring 2, so as to reduce the construction cost.

[0047] In some embodiments, the diameter of the support pile 3 is greater than or equal to 300 mm, and the concrete strength grade of the support pile 3 is greater than or equal to C20, so as to ensure the structural strength of the support pile 3.

[0048] In some embodiments, the ratio of the size of the support pile 3 in the up-down direction to the size of the support ring 2 in the up-down direction is less than 1. That is, the size of the support pile 3 in the up-down direction is less than the size of the support ring 2 in the up-down direction, so as to make the support ring 2 can bear most of the pressure from the extended pile cap 1 and the components above the extended pile cap 1, and ensure the stability of the fan foundation 100. For example, the ratio of the size of the support pile 3 in the up-down direction to the size of the support ring 2 in the up-down direction is 0.8.

[0049] In some embodiments, the size of the support pile 3 in the up-down direction is greater than or equal to 4 meters and less than or equal to 7 meters, and the size of the support ring 2 in the up-down direction is greater than or equal to 6 meters and less than or equal to 9 meters. For example, the size of the support pile 3 in the up-down direction is 6 meters, and the size of the support ring 2 in the up-down direction is 8 meters.

[0050] As shown in Figure 1 and Figure 3 , the fan foundation 100 according to the embodiments of the present application comprises a first reinforcing member 4. The first segment 41 of the first reinforcing member 4 is located in the extended pile cap 1, the second segment 42 of the first reinforcing member 4 is located in the support ring 2, and the third segment 43 of the first reinforcing member 4 is located in the support pile 3. The first segment 41, the second segment 42 and the third segment 43 of the first reinforcing member 4 are sequentially connected from top to bottom. Specifically, the first segment 41, the second segment 42 and the third segment 43 of the first reinforcing member 4 extend in the up-down direction and are sequentially connected, so as to make the connection of the extended pile cap 1, the support ring 2 and the support seat 3 more stable.

[0051] AsFigure 3 As shown, in some embodiments, the support ring 2 comprises a plurality of first engagement piles 21 and a plurality of second engagement piles 22, the first engagement piles 21 and the second engagement piles 22 are arranged alternately along the circumference of the support ring 2. The second section 42 of the first reinforcing member 4 is arranged in the second engagement pile 22, the plurality of second engagement piles 22 and the plurality of support piles 3 are connected one by one, and the second engagement pile 22 is located directly above the corresponding support pile 3. That is, the support ring 2 is formed by the plurality of first engagement piles 21 and the plurality of second engagement piles 22 arranged alternately along the circumference of the support ring 2. The second engagement pile 22 and the support pile 3 can be poured together to increase the connection strength of the support ring 2 and the support pile 3.

[0052] In some embodiments, the support ring 2 is poured by a concrete formwork, the concrete formwork comprises a first annular formwork and a second annular formwork, the first annular formwork is sleeved on the outer circumferential side of the second annular formwork. The first annular formwork and the second annular formwork define a pouring cavity for pouring concrete, the support ring 2 is provided with a second reinforcing member, the second reinforcing member is annular and located between the inner annular surface and the outer annular surface of the support ring 2, and the second reinforcing member is located directly above the plurality of support piles 3. That is, the support ring 2 is poured by the annular concrete formwork at one time, and the second reinforcing member is arranged at the bottom of the pouring cavity, so that the structural strength of the bottom of the support ring 2 is higher. The second reinforcing member is connected with the reinforcing member in the support pile 3 to increase the connection strength of the support ring 2 and the support pile 3.

[0053] The application further provides a wind turbine generator set comprising the wind turbine foundation 100 according to the embodiments of the application. Therefore, the wind turbine generator set according to the embodiments of the application has the advantages of low construction cost and stable structure.

[0054] The application further provides a wind turbine foundation 100 according to the embodiments of the application, comprising the following steps:

[0055] In step S1, a first drill hole extending to the ground is arranged, and concrete is poured into the first drill hole to form a first engagement pile 21. A second drill hole extending to the ground is arranged, and after a reinforcing member is arranged in the second drill hole, concrete is poured into the second drill hole to form a support pile 3 and a second engagement pile 22 located above the support pile 3. The first engagement pile 21 and the second engagement pile 22 are poured alternately along the circumference to form a support ring 2 located above the support pile 3. Specifically, the first drill hole and the second drill hole are both hole bodies extending in the up-down direction, the lower part of the second drill hole is located below the first drill hole and constitutes the hole body for forming the support pile 3, that is, the second engagement pile 22 and the support pile 3 are formed together. The first engagement pile 21 can not be provided with a reinforcing member, after each first engagement pile 21 is formed, a second drill hole adjacent to it is drilled, and the second drill hole can penetrate at least part of the first engagement pile 21 so that the first engagement pile 21 and the second engagement pile 22 engage and form the support ring 2.

[0056] In step S2, a plurality of third drill holes are formed downwardly, reinforcing members are arranged in each of the third drill holes, and concrete is poured into the third drill holes to form a plurality of support piles 3 arranged in a circumferential direction, a concrete form is arranged on top of the plurality of support piles 3, and after reinforcing members are arranged in an annular pouring cavity of the concrete form, concrete is poured into the pouring cavity to form an annular support ring 2. Specifically, a foundation pit is excavated according to the diameter and depth of the support ring 2, the third drill holes are drilled downwardly in the foundation pit after the foundation pit is supported, the support piles 3 are formed, the reinforcing members in the support piles 3 are connected to the reinforcing members in the foundation pit, and then the concrete form is arranged in the foundation pit, and the reinforcing members are arranged in the pouring cavity to pour and form the support ring 2.

[0057] In step S3, the extended pile cap 1 is poured on the support ring 2 using concrete, and the reinforcing members in the extended pile cap 1 are connected to the reinforcing members in the support ring 2.

[0058] In which, one of step S1 and step S2 is implemented before step S3. That is, there are two methods for constructing the support piles 3 and the support ring 2, and one of the two methods is selected to pour the extended pile cap 1 on the support ring 2.

[0059] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0060] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0061] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0063] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0064] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and the changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A fan foundation, characterized by, The wind turbine foundation comprises: an extended bearing platform; a support ring arranged at the bottom of the extended bearing platform, the support ring being an annular structure extending in the up-down direction; a plurality of support piles arranged at the bottom of the support ring in the circumferential direction of the support ring, the support ring and the support piles being located below the ground; a ratio of a size of the support pile in the up-down direction to a size of the support ring in the up-down direction is less than 1; the size of the support pile in the up-down direction is greater than or equal to 4 meters and less than or equal to 7 meters, and the size of the support ring in the up-down direction is greater than or equal to 6 meters and less than or equal to 9 meters; the extended bearing platform, the support ring and the support piles are all formed by pouring concrete; a thickness of the support ring is greater than or equal to 500 mm, and a concrete strength grade of the support ring is greater than or equal to C15; a diameter of the support pile is greater than or equal to 300 mm, and a concrete strength grade of the support pile is greater than or equal to C20; a first reinforcing member is arranged, a first section of the first reinforcing member being located in the extended bearing platform, a second section of the first reinforcing member being located in the support ring, and a third section of the first reinforcing member being located in the support pile, the first section, the second section and the third section of the first reinforcing member being sequentially connected from top to bottom; the extended bearing platform is disc-shaped, the upper surface and the lower surface of the extended bearing platform are both horizontal surfaces, the support ring is a circular ring structure, and the outer diameter of the extended bearing platform is greater than the outer diameter of the support ring; the diameter of the extended bearing platform is greater than or equal to 8 meters and less than or equal to 14 meters; the diameter of the support pile is less than or equal to the thickness of the support ring.

2. The wind turbine foundation according to claim 1, wherein the support ring comprises a plurality of first engagement piles and a plurality of second engagement piles, the first engagement piles and the second engagement piles being sequentially and alternately arranged in the circumferential direction of the support ring, the second section of the first reinforcing member being arranged in the second engagement piles, and the plurality of second engagement piles and the plurality of support piles being one-to-one connected, the second engagement piles being located directly above the corresponding support piles.

3. The wind turbine foundation according to claim 1, wherein the support ring is formed by pouring concrete using a concrete formwork, the concrete formwork comprises a first annular formwork and a second annular formwork, the first annular formwork being sleeved on the outer circumferential side of the second annular formwork, the first annular formwork and the second annular formwork defining a pouring cavity for pouring concrete, a second reinforcing member being arranged in the support ring, the second reinforcing member being annular and located between the inner and outer annular surfaces of the support ring, and the second reinforcing member being located directly above the plurality of support piles.

4. A wind power unit, characterized in that The wind turbine foundation comprises the wind turbine foundation according to any one of claims 1-3.

5. A method of constructing a fan foundation according to any one of claims 1 to 3, characterised in that, The method comprises the following steps: S1, a first borehole extending to the underground is arranged, and concrete is poured into the first borehole to form a first engagement pile; a second borehole extending to the underground is arranged, a reinforcing member is arranged in the second borehole, and then concrete is poured into the second borehole to form a support pile and a second engagement pile located above the support pile; the first engagement pile and the second engagement pile are sequentially and alternately poured in the circumferential direction to form a support ring located above the support pile. S2, a plurality of third drill holes extending downward are arranged, reinforcing members are arranged in each of the third drill holes, and concrete is poured into the third drill holes to form a plurality of support piles arranged in a circumferential direction at intervals, a concrete formwork is arranged on top of the plurality of support piles, and after reinforcing members are arranged in an annular pouring cavity of the concrete formwork, concrete is poured into the pouring cavity to form an annular support ring; S3, the support ring is used to pour concrete to expand the pile cap, and reinforcing members in the pile cap are connected to reinforcing members in the support ring; The step S3 is implemented after one of the steps S1 and S2 is implemented.

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