Gravity type fan foundation and construction method thereof

Abstract

The invention relates to the technical field of fan foundations, and provides a gravity type fan foundation and a construction method thereof. The main body is arranged on the cushion layer, and a cylindrical first core filling area is arranged in the middle of the main body; the second core filling area is cylindrical, is arranged between the cushion layer and the main body and is used for filling a light material, and the second core filling area and the first core filling area are coaxially arranged and have the same section radius; the second core filling area used for being filled with the light materials is additionally arranged in the center of the bottom of the main body, the stress mode of the bottom of the foundation is changed, stress distribution of the bottom of the foundation is converted into annular bottom face distribution from traditional circular full-area distribution, the center area does not transmit loads to the foundation any more, the loads are concentrated in the annular area of the edge of the foundation, and therefore the foundation is protected. The load density of the unit area in the annular area is increased, the minimum pressure of the bottom of the foundation is effectively improved, the stability of the foundation is enhanced, and the risk that the bottom of the foundation is disengaged is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine foundations, and in particular to a gravity wind turbine foundation and a construction method thereof. Background Art

[0002] At present, the commonly used onshore wind turbine foundations mostly adopt reinforced concrete extended foundations. These foundation forms are still traditional truncated cone or cylindrical gravity foundations. The foundation form is single, the amount of foundation concrete is large, and the weight is heavy. Although the connection between the wind turbine tower and the foundation and the foundation can be achieved by applying prestress to anchor bolts or anchor rods, the wind turbine still has the risk of overturning together with the foundation under large bending moment loads.

[0003] Moreover, with the rapid growth of the single-unit capacity of onshore wind turbine models, the current maximum single-unit capacity of onshore wind turbine models has exceeded 10MW. As a result, the tower diameter has also increased, and the corresponding foundation top diameter has also increased. As a result, the plane size of the foundation has also increased rapidly, and the infrastructure construction cost has increased. Summary of the invention

[0004] The present invention provides a gravity type fan foundation and a construction method thereof, which are used to solve the problem of unreliable stability of the fan foundation in the prior art.

[0005] In a first aspect, the present invention provides a gravity fan foundation, comprising: Cushion; A main body is arranged on the cushion layer, and a cylindrical first core-filling area is arranged in the middle of the main body; The second core-filling area is configured in a cylindrical shape and is disposed between the cushion layer and the main body for filling with lightweight materials. The second core-filling area is coaxially disposed with the first core-filling area and has the same cross-sectional radius.

[0006] According to the gravity fan foundation provided by the present invention, a reserved space is provided in the middle of the cushion layer, the second core filling area is provided in the reserved space, and the reserved space is also provided with a covering layer.

[0007] According to the gravity wind turbine foundation provided by the present invention, the main body includes a core area and an edge area, the bottom of the edge area is connected to the cushion layer, the bottom of the core area is connected to the covering layer, and the first core filling area is arranged in the middle of the core area.

[0008] According to the gravity fan foundation provided by the present invention, a core filling area bottom plate is further provided in the middle of the main body, and the core filling area bottom plate is provided at the bottom of the first core filling area and contacts the covering layer.

[0009] According to the gravity wind turbine foundation provided by the present invention, a plurality of anchor bolts are provided in the main body, the plurality of anchor bolts are arranged around the first core filling area, and the bottoms of the anchor bolts are arranged in the reserved space.

[0010] According to the gravity fan foundation provided by the present invention, a mounting hole is arranged at the top of the main body, the mounting holes are the same in number as the anchor bolts and have one-to-one corresponding positions, the tops of the anchor bolts are located in the mounting holes, and the mounting holes are used for pouring grouting materials.

[0011] According to the gravity fan foundation provided by the present invention, the distance between the edge of the first core filling area and the mounting hole is equal to the width of the mounting hole.

[0012] According to the gravity fan foundation provided by the present invention, the thickness of the bottom plate of the core filling area is h>1m.

[0013] According to the gravity fan foundation provided by the present invention, a steel mesh is arranged in the bottom plate of the core-filling area, and the diameter of the steel mesh is larger than the diameter of the first core-filling area.

[0014] In a second aspect, the present invention further provides a method for constructing a gravity wind turbine foundation, comprising: pouring cushion concrete; Install prestressed anchor bolts; Install the material for the second core fill area and then pour the concrete for the cover layer; Tie up the steel mesh in the bottom plate of the core filling area and the steel bars in other areas, and install the foundation formwork; Pouring the main concrete of the foundation; After the foundation strength reaches the demoulding strength, remove the foundation formwork; The material of the first core filling area is filled and compacted.

[0015] The gravity wind turbine foundation provided by the present invention changes the force mode of the bottom of the foundation by adding a second core filling area for filling lightweight materials at the bottom center of the main body, optimizes the force state of the foundation, makes the central area no longer directly transfer the load to the foundation, and changes the force distribution of the bottom of the foundation from the traditional circular full-area distribution to annular bottom surface distribution. Since the central area no longer transfers the load, the load is concentrated in the annular area at the edge of the foundation. In this way, the load density per unit area in the annular area increases, so that the effective contact pressure of the bottom of the foundation increases. By changing the force mode of the bottom of the foundation from the circular full-area distribution to the annular bottom surface distribution, the minimum pressure pkmin of the bottom of the foundation is effectively increased, thereby enhancing the stability of the foundation and reducing the risk of the bottom of the foundation being detached. At the same time, this design also reduces the amount of concrete used and reduces the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a gravity fan foundation provided by an embodiment of the present invention.

[0018] Figure 2 It is a longitudinal section view of a gravity fan foundation provided by an embodiment of the present invention.

[0019] Figure 3 yes Figure 2 A partial enlarged view of .

[0020] Figure 4 It is a schematic diagram of the force distribution of the basic annular bottom surface provided by an embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the force distribution of the circular full-area bottom of the foundation in the prior art.

[0022] Figure 6 It is a flowchart of a method for constructing a gravity wind turbine foundation provided by an embodiment of the present invention.

[0023] Reference numerals: 1. Pad layer; 11. Reserve space; 2. Main body; 21. Core area; 22. Edge area; 3. First core filling area; 4. Second core filling area; 5. Covering layer; 6. Bottom plate of core filling area; 61. Steel mesh; 7. Anchor bolt; 8. Mounting hole. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the traditional design of gravity wind turbine foundation, the bottom of the foundation is usually a circular full-area force distribution, and the entire bottom of the foundation evenly bears the load from the upper structure. However, in some cases, especially in the central area, due to the low stress level of the concrete, this area may not be able to effectively transfer the load to the foundation, resulting in negative pressure or detachment at the bottom of the foundation.

[0027] Combine the following Figure 1-Figure 6 The invention describes a gravity wind turbine foundation and a construction method thereof.

[0028] This embodiment provides a gravity fan foundation, such as Figure 1-Figure 4 As shown, it includes: a cushion layer 1, a main body 2 and a second core filling area 4.

[0029] The cushion layer 1 may be made of concrete, for example, C20 concrete, with a thickness of 100 mm. The specific thickness and concrete strength may be selected according to the environment category and specifications.

[0030] The material of the main body 2 can be selected as C40 concrete. The main body 2 is arranged on the cushion layer 1. A cylindrical first core-filling area 3 is arranged in the middle of the main body 2. The second core-filling area 4 is arranged in a cylindrical shape and arranged between the cushion layer 1 and the main body 2, and is used to fill a lightweight material, for example, a lightweight and low-strength foamed benzene board is selected. The second core-filling area 4 is coaxially arranged with the first core-filling area 3 and has the same cross-sectional radius. In other words, the second core-filling area 4 is arranged at the bottom center of the main body 2, and is coaxially arranged with the second core-filling area 4 and has the same cross-sectional size.

[0031] With such arrangement, the present invention changes the stress mode of the bottom of the foundation by adding a second core filling area 4 for filling lightweight materials at the bottom center of the main body 2, optimizes the stress state of the foundation, and makes the central area no longer directly transfer the load to the foundation. The stress distribution of the bottom of the foundation is changed from the traditional circular full-area distribution to the annular bottom surface distribution. Since the central area no longer transfers the load, the load is concentrated in the annular area at the edge of the foundation. In this way, the load density per unit area in the annular area increases, so that the effective contact pressure of the bottom of the foundation increases. By changing the stress mode of the bottom of the foundation from the circular full-area distribution to the annular bottom surface distribution, the minimum pressure pkmin of the bottom of the foundation is effectively increased, thereby enhancing the stability of the foundation and reducing the risk of the bottom of the foundation being detached. At the same time, this design also reduces the amount of concrete used and reduces the construction cost.

[0032] Preferably, the filling material of the first core filling area 3 is a material such as sandstone, backfill soil, etc. that is cheap, easy to obtain, and has a large bulk density, and the material in the first core filling area 3 is compacted as much as possible to obtain more weight without changing the volume. Compared with the traditional solution, such a setting reduces the amount of concrete used in the low stress area, further saving concrete materials and costs.

[0033] In some specific embodiments, a reserved space 11 is provided in the middle of the cushion layer 1, the second core-filling area 4 is provided in the reserved space 11, and a covering layer 5 is also provided in the reserved space 11. Figure 2 As shown, the groove formed by the sinking in the middle of the cushion layer 1 serves as the reserved space 11, the second core filling area 4 is arranged in the reserved space 11, and is located in the middle of the reserved space 11, and the covering layer 5 is a poured concrete layer, which is used to cover the second core filling area 4 after filling with lightweight materials, and to cover the remaining space in the reserved space 11. The covering layer 5 protects the core filling material to prevent it from being damaged or shifted during the construction process, thereby ensuring the integrity and effectiveness of the core filling material.

[0034] In this embodiment, the main body 2 includes a core area 21 and an edge area 22, the first core filling area 3 is arranged in the middle of the core area 21, the bottom of the edge area 22 is connected to the cushion layer 1, and the bottom of the core area 21 is connected to the cover layer 5. Figure 2 As shown, the opening size of the reserved space 11 can be set to be no less than the bottom size of the core area 21 , so that the bottom of the core area 21 contacts the cover layer 5 , while the edge area 22 directly contacts the cushion layer 1 .

[0035] Furthermore, a core filling area bottom plate 6 is provided at the bottom of the first core filling area 3 , the core filling area bottom plate 6 is in contact with the cover layer 5 , and the core filling area bottom plate 6 is a cast-in-place reinforced concrete slab.

[0036] In this way, the cast-in-place reinforced concrete slab can evenly transfer the load from the superstructure and avoid local stress concentration. This uniform stress distribution helps to improve the overall bearing capacity of the foundation. In addition, by setting up cast-in-place reinforced concrete slabs, the amount of concrete used in low-stress areas is reduced, thereby reducing construction costs.

[0037] Specifically, the thickness h of the core-filling area bottom plate 6 is greater than 1 m, and a steel mesh 61 is provided in the core-filling area bottom plate 6 . The steel mesh 61 has a diameter greater than that of the first core-filling area 3 and extends toward the surrounding core area 21 .

[0038] In this way, by arranging a cast-in-place reinforced concrete slab at the bottom of the first core filling area 3, the overall stiffness of the foundation is increased, and the core filling area bottom plate 6 is tightly combined with the main body 2 to form an integral structure, thereby improving the bending and shear resistance of the foundation and reducing the risk of structural deformation and damage. The thicker core filling area bottom plate 6 can better resist external loads and internal stresses, especially dynamic loads under wind action, thereby enhancing the bending stiffness of the foundation and making it more stable under dynamic loads.

[0039] In this embodiment, the steel mesh 61 is arranged in the slab, which means that a mesh sheet formed by welding plain round steel bars or ribbed steel bars is arranged in the slab of the building structure according to certain specifications and requirements. By arranging the steel mesh 61 in the slab, the steel mesh 61 can effectively disperse and transfer stress, improve the crack resistance and durability of the concrete slab, prevent the generation and expansion of cracks, and extend the service life of the structure. The design of the steel mesh 61 extending into the core area 21 enhances the connection strength between the various parts of the foundation, thereby ensuring the integrity and stability of the structure.

[0040] In some embodiments, the radius of the steel mesh 61 is at least 35d larger than the radius of the first core filling area 3, where d is the diameter of the round steel bars that make up the steel mesh 61. That is, the steel mesh 61 can extend to the surrounding area and into the surrounding core area 21. The steel mesh 61 extends into the core area 21 by no less than 35d. This arrangement ensures good bonding and anchoring between the steel bars and concrete, enables the steel bars to effectively transfer stress, and enhances the connection strength between the various parts of the foundation.

[0041] In this embodiment, a plurality of anchor bolts 7 are penetrated through the main body 2 , and the plurality of anchor bolts 7 are arranged around the first core-filling area 3 , and the bottom of the anchor bolts 7 is arranged in the reserved space 11 .

[0042] In this way, multiple anchor bolts 7 are arranged around the first core filling area 3 to form a uniformly distributed support system, so that the load can be evenly transferred to various parts of the foundation, avoiding local stress concentration. The anchor bolts 7 pass through the foundation body 2 and are firmly connected thereto, thereby enhancing the tensile and shear resistance of the foundation body 2. This connection method enables the foundation to better resist external loads, especially dynamic loads under wind action; by setting the bottom of the anchor bolt 7 in the reserved space 11, it is ensured that the anchor bolt 7 can be firmly fixed in the foundation. The existence of the reserved space 11 makes the installation of the anchor bolt 7 more precise and reduces construction errors.

[0043] like Figure 3 As shown, in some embodiments, a mounting hole 8 is provided at the top of the main body 2, and the number of the mounting holes 8 is the same as that of the anchor bolts 7 and the positions correspond one to one. The top of the anchor bolt 7 is located in the mounting hole 8, and the mounting hole 8 is used for pouring grouting materials, such as epoxy resin grouting material or non-shrinkage cement-based grouting material. These materials have excellent bonding properties and durability, can ensure a tight connection between the anchor bolt 7 and the foundation main body 2, and can provide additional anti-corrosion protection to prevent the anchor bolt 7 from being corroded during long-term use, especially in a humid or corrosive environment.

[0044] The specific installation process is: inject high-strength grouting material evenly into the hole until the grouting material completely fills the hole. During the grouting process, attention should be paid to removing bubbles to ensure that the grouting material is in full contact with the hole wall and the surface of the anchor 7; after that, nuts and washers can be installed on the top of the anchor 7, with specifications matching the anchor 7, and the nuts are tightened to ensure that the anchor 7 is firmly fixed to the foundation body 2.

[0045] In this way, the top of the anchor bolt 7 is fixed by high-strength grouting material, which can fully fill the gap between the anchor bolt 7 and the foundation body 2, ensuring a tight connection between the anchor bolt 7 and the foundation body 2. After being fixed by the grouting material, it is connected to the top of the anchor bolt 7 by bolts, thereby enhancing the connection strength between the anchor bolt 7 and the foundation body 2 and improving the integrity of the structure.

[0046] In this embodiment, Figure 3 As shown, the distance B between the edge of the first core-filling area 3 and the mounting hole 8 is equal to the width B of the mounting hole 8 .

[0047] Such a setting makes the construction process more precise and reduces construction errors. The consistent spacing and width make it easier to control the position and depth of the anchor bolt 7 during the construction process, thereby improving the structural quality and construction efficiency, ensuring the connection strength between the anchor bolt 7 and the foundation body 2, and the appropriate distance allows the grouting material to fully fill the hole, thereby enhancing the fixing effect of the anchor bolt 7, improving the tensile and shear resistance of the anchor bolt 7, and preventing pull-out or shear damage under external loads such as wind. This design ensures that the distance between the edge of the first core filling area 3 and the mounting hole 8 is moderate, neither too large nor too small, which helps to maintain the integrity and integrity of the structure, and makes the distribution of the anchor bolt 7 in the foundation more even, avoiding local stress concentration.

[0048] The embodiment of the present invention also discloses a method for constructing a gravity wind turbine foundation, comprising: Step 1: Pour the concrete of cushion layer 1.

[0049] In this embodiment, a 100 mm thick C20 concrete cushion layer 1 is poured at a predetermined position. The specific thickness and concrete strength of the cushion layer 1 should be selected according to the environmental category and design specifications to provide a flat and solid foundation for the wind turbine foundation.

[0050] Step 2: Install prestressed anchor bolts 7.

[0051] Specifically, holes are reserved in the cushion layer 1, the position and size of the holes should match the design of the anchor bolt 7; the anchor bolt 7 is inserted into the reserved holes, dust and debris in the holes are removed, and high-strength grouting material is evenly injected into the holes until the grouting material completely fills the holes and overflows the surface, ensuring that it hardens and solidifies within the specified time.

[0052] Step 3: Install the material of the second core filling area 4 and then pour the concrete of the cover layer 5.

[0053] Specifically, the material of the second core filling area 4, such as a lightweight low-strength foam board, is installed in the reserved space 11 in the middle of the cushion layer 1, and the concrete of the cover layer 5 is poured on the core filling material to ensure that the thickness and concrete strength of the cover layer 5 meet the design requirements. In this way, the amount of concrete used in the low stress area is reduced, the dead weight of the foundation is reduced, and the material utilization rate is improved.

[0054] Step 4: Tie up the steel mesh 61 in the bottom plate 6 of the core filling area and the steel bars in other areas, and install the foundation formwork.

[0055] Specifically, a steel mesh 61 is tied at the bottom of the first core filling area 3, and the steel mesh 61 extends into the core area 21 by no less than 35 times the diameter of the steel bar. The steel bars in other areas are tied to ensure that the position and quantity of the steel bars meet the design requirements, and the foundation template is installed to ensure that the position and size of the template meet the design requirements. The template should be firm and flat. In this way, the structural strength and stability of the foundation body 2 are ensured.

[0056] Step 5: Pour concrete into the foundation body 2. The purpose is to form the foundation body 2 and ensure the integrity and stability of the foundation.

[0057] Specifically, pour the foundation body 2 concrete according to the design requirements to ensure the uniformity and density of the concrete. During the pouring process, attention should be paid to eliminating bubbles to ensure sufficient contact between the concrete and the steel bars and formwork. The poured concrete should be properly maintained to ensure that it hardens and solidifies within the specified time.

[0058] Step 6: After the foundation strength reaches the demoulding strength, remove the foundation formwork to ensure that the shape and size of the foundation body 2 meet the design requirements.

[0059] Step 7: Fill and compact the material in the first core filling area 3. The purpose is to further reduce the amount of concrete used in the low stress area and improve the stability of the foundation and the material utilization rate.

[0060] Specifically, the first core filling area 3 is filled with cheap and easily available materials, such as graded sand and gravel, backfill soil, etc., to ensure that the position and density of the filling materials meet the design requirements, and the filling materials are compacted using appropriate compacting equipment to ensure that they gain more weight without changing their volume.

[0061] Through the above steps, the present invention realizes a method for constructing a gravity wind turbine foundation. The step-by-step construction ensures the orderliness and standardization of the construction process, improves the construction efficiency and quality. The design sets a first core filling area 3 in the core area 21 of the foundation, and replaces part of the concrete with inexpensive and easily available materials such as graded sand and gravel, backfill soil, etc., thereby reducing the amount of concrete used and reducing costs. Moreover, since these core filling materials have a large bulk density, they can help improve the stability of the entire foundation. By setting a cast-in-place reinforced concrete slab below the first core filling area 3 and setting a second core filling area 4 filled with lightweight materials such as foam benzene boards below it, the force distribution pattern of the bottom of the foundation is changed, and the circular full-area force distribution of the bottom of the traditional gravity wind turbine foundation is transformed into an annular bottom surface force distribution, thereby increasing the minimum pressure pkmin at the bottom of the foundation. Figure 4 and Figure 5, for the main body 2 of the same size, the minimum annular bottom pressure pkmin of the present invention is greater than the minimum circular full-area bottom pressure pkmin under the prior art, thereby reducing the risk of the bottom of the foundation being detached, improving the overall stability and wind resistance of the foundation, and providing strong support for the economy and reliability of wind power generation projects.

[0062] The gravity core-filling fan foundation provided by the present invention optimizes the structural layout by rationally utilizing material properties, thereby achieving the purpose of cost saving and ensuring the safety of the structure.

[0063] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gravity fan foundation, characterized in that: include: Cushion (1); A main body (2) is arranged on the cushion layer (1), and a cylindrical first core filling area (3) is arranged in the middle of the main body (2); The second core-filling area (4) is arranged in a cylindrical shape and is arranged between the cushion layer (1) and the main body (2) for filling light materials. The second core-filling area (4) and the first core-filling area (3) are arranged coaxially and have the same cross-sectional radius.

2. The gravity fan foundation according to claim 1, characterized in that: A reserved space (11) is provided in the middle of the cushion layer (1), the second core-filling area (4) is provided in the reserved space (11), and the reserved space (11) is also provided with a covering layer (5).

3. The gravity fan foundation according to claim 2, characterized in that: The main body (2) comprises a core area (21) and an edge area (22), the bottom of the edge area (22) is connected to the cushion layer (1), the bottom of the core area (21) is connected to the cover layer (5), and the first core filling area (3) is arranged in the middle of the core area (21).

4. The gravity fan foundation according to claim 2, characterized in that: A core filling area bottom plate (6) is also provided in the middle of the main body (2); the core filling area bottom plate (6) is provided at the bottom of the first core filling area (3) and is in contact with the covering layer (5).

5. The gravity fan foundation according to claim 2, characterized in that: A plurality of anchor bolts (7) are inserted into the main body (2), the plurality of anchor bolts (7) are arranged around the first core filling area (3), and the bottom of the anchor bolts (7) is arranged in the reserved space (11).

6. The gravity fan foundation according to claim 5, characterized in that: The top of the main body (2) is provided with a mounting hole (8), the number of the mounting holes (8) is the same as the number of the anchor bolts (7) and the positions correspond one to one, the top of the anchor bolt (7) is located in the mounting hole (8), and the mounting hole (8) is used for pouring grouting material.

7. The gravity fan foundation according to claim 6, characterized in that: The distance B between the edge of the first core filling area (3) and the mounting hole (8) is equal to the width B of the mounting hole (8).

8. The gravity fan foundation according to claim 4, characterized in that: The thickness of the core filling area bottom plate (6) is h>1m.

9. The gravity fan foundation according to claim 4, characterized in that: A steel mesh (61) is provided in the core-filling area bottom plate (6), and the diameter of the steel mesh (61) is greater than the diameter of the first core-filling area (3).

10. A method for constructing a gravity wind turbine foundation, characterized in that: include: Pouring the cushion layer (1) concrete; Install the prestressed anchor bolts (7); Install the material of the second core filling area (4), and then pour the concrete of the cover layer (5); Tie up the steel mesh (61) in the bottom plate (6) of the core filling area and the steel bars in other areas, and install the foundation formwork; Pour the main body of the foundation (2) concrete; After the foundation strength reaches the demoulding strength, remove the foundation formwork; The material of the first core filling area (3) is filled and compacted.

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