Secondary grouting template for fan foundation and fan foundation

Abstract

The utility model provides a fan foundation secondary grouting formwork and a fan foundation. The fan foundation secondary grouting formwork comprises an outer annular side plate, an inner annular side plate, a first positioning piece and a second positioning piece. The inner annular side plate is concentrically arranged in the outer annular side plate, the outer annular side plate and the inner annular side plate are obliquely arranged, the distance from the top of the outer annular side plate to the top of the inner annular side plate is smaller than the distance from the bottom of the outer annular side plate to the bottom of the inner annular side plate, and the first positioning piece is used for positioning the position of the outer annular side plate; and the second positioning piece is used for positioning the position of the inner annular side plate. According to the secondary grouting formwork for the fan foundation, the inclination angle of the secondary grouting base body is directly formed through inclination of the outer annular side plate and the inner annular side plate, the construction efficiency is improved, and waste of grouting materials is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and particularly relates to a secondary grouting formwork for a wind turbine foundation and a wind turbine foundation. Background Art

[0002] In order to effectively improve the safety and reliability of wind turbines and reduce accidents caused by the loosening or damage of the tower barrel structure, high-strength grouting materials are often used to fill the contact surface between the wind turbine foundation and the flange at the bottom section of the tower barrel.

[0003] The high-strength grouting material is generally realized by reserving a grouting space and filling high-strength materials in this space after the wind turbine foundation is poured. This is usually called secondary grouting. The traditional secondary grouting of the wind turbine foundation is usually designed to erect vertical formwork on the top surface of the foundation for pouring and filling. Then, 3 hours to 6 hours after the grouting is completed, bevel angles are cut out along the edge of the bottom plate to form inclined slopes.

[0004] However, the strength of the grouting material increases very fast, making it difficult to trim and causing waste of the grouting material. Summary of the Utility Model

[0005] The present application provides a secondary grouting formwork for a wind turbine foundation and a wind turbine foundation to solve the problems of difficult trimming of secondary grouting and material waste.

[0006] On the one hand, the present application provides a secondary grouting formwork for a wind turbine foundation, including an outer annular side plate, an inner annular side plate, a first positioning member, and a second positioning member;

[0007] The inner annular side plate is located inside the outer annular side plate and the two are concentrically arranged. Both the outer annular side plate and the inner annular side plate are inclined. The distance from the top of the outer annular side plate to the top of the inner annular side plate is less than the distance from the bottom of the outer annular side plate to the bottom of the inner annular side plate. The first positioning member is used to position the position of the outer annular side plate, and the second positioning member is used to position the position of the inner annular side plate.

[0008] In some embodiments, the angle between the outer annular side plate and the inner annular side plate and the horizontal plane is greater than or equal to 50° and less than or equal to 55°.

[0009] In some embodiments, the first positioning member includes a plurality of first positioning bolts. The first positioning bolts are used to be preset on the wind turbine foundation body to position the position of the outer annular side plate, and the first positioning bolts are connected to the outer annular side plate.

[0010] In some embodiments, the second positioning member includes a plurality of second positioning bolts, which are preset on the fan foundation body to position the inner annular side plate, and the second positioning bolts are connected to the inner annular side plate.

[0011] In some embodiments, the outer annular side plate includes a plurality of outer arc plates, a plurality of first rib plates and a plurality of first connecting members. The outer arc plates are connected end to end to form a ring. The first rib plates are arranged on the outer side walls of the outer arc plates, and the first connecting members are arranged on the outer arc plates to connect two adjacent outer arc plates.

[0012] In some embodiments, the first connecting member includes a first connecting bolt and first connecting plates arranged at both ends of the outer arc plate. The first connecting bolt passes through the adjacent first connecting plates of two adjacent outer arc plates to connect the adjacent outer arc plates.

[0013] In some embodiments, the inner annular side plate includes a plurality of inner arc plates, a plurality of second rib plates and a plurality of second connecting members. The inner arc plates are connected end to end to form a ring. The second rib plates are arranged on the inner side walls of the inner arc plates, and the second connecting members are arranged on the inner arc plates to connect two adjacent inner arc plates.

[0014] In some embodiments, the second connecting member includes a second connecting bolt and second connecting plates arranged at both ends of the inner arc plate. The second connecting bolt passes through the adjacent second connecting plates of two adjacent inner arc plates to connect the adjacent inner arc plates.

[0015] On the other hand, the present application provides a fan foundation, which includes a fan foundation body, anchor bolts, anchor plates and a secondary grouting matrix formed by using the secondary grouting template as described above. The anchor plates are arranged on the secondary grouting matrix. The anchor bolts are preset on the fan foundation body and pass through the secondary grouting matrix to be connected to the anchor plates.

[0016] In some embodiments, a protective layer is coated on the secondary grouting matrix.

[0017] The secondary grouting formwork for a fan foundation and the fan foundation provided in this application. The secondary grouting formwork is formed by enclosing an outer annular side plate and an inner annular side plate that are inclined, so that an inclined surface is directly formed after the secondary grouting matrix is cast, avoiding subsequent trimming, improving construction efficiency, saving the use of grouting materials at the same time, and reducing waste. At the same time, the positions of the outer annular side plate and the inner annular side plate are positioned by the first positioning member and the second positioning member, so as to fix the outer annular side plate and the inner annular side plate at the required positions. While providing a connection method, the first connecting plate and the second connecting plate strengthen the strength of the outer annular side plate and the inner annular side plate, so as to reduce the deformation of the outer annular side plate and the inner annular side plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0019] Figure 1 It is a schematic structural diagram of the secondary grouting formwork for a fan foundation and the fan foundation provided in an embodiment of this application;

[0020] Figure 2 It is Figure 1 a schematic structural diagram of another angle of

[0021] Figure 3 It is Figure 2 an enlarged schematic structural diagram of part A in

[0022] Figure 4 It is Figure 1 a schematic structural diagram of the outer annular side plate in

[0023] Figure 5 It is Figure 1 a schematic structural diagram of the inner annular side plate in

[0024] Description of the reference numerals:

[0025] 100 - outer annular side plate; 110 - outer arc plate; 120 - first connecting member; 121 - first connecting bolt; 122 - first connecting plate; 130 - first rib plate;

[0026] 200 - inner annular side plate; 210 - inner arc plate; 220 - second connecting member; 221 - second connecting bolt; 222 - second connecting plate; 230 - second rib plate;

[0027] 300 - first positioning member;

[0028] 400 - second positioning member;

[0029] 500 - fan foundation body;

[0030] 600 - Anchor bolt;

[0031] 700 - Anchor plate;

[0032] 800 - Secondary grouting matrix.

[0033] Through the above - mentioned drawings, specific embodiments of the present application have been shown, and there will be a more detailed description hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0034] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0035] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0036] In the present application, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] To effectively improve the safety and reliability of wind turbines and reduce accidents caused by the loosening or damage of the tower barrel structure, high-strength grouting material is often used to fill the contact surface between the foundation of the wind turbine unit and the flange at the bottom section of the tower barrel.

[0039] The high-strength grouting material is generally realized by reserving a grouting space. After the foundation of the wind turbine is poured, the high-strength material is filled in this space, which is usually called secondary grouting. The traditional secondary grouting of the wind turbine foundation is usually designed to erect vertical formwork on the top surface of the foundation for pouring and filling. Then, 3h to 6h after the grouting is completed, bevel angles are cut out along the edge of the bottom plate to form an inclined slope. However, the strength of the grouting material increases very fast. Usually, six hours after the grouting is completed, the strength can reach more than 80 Mpa. At this time, it is no longer possible to perform manual trimming, and mechanical trimming is required, which makes the trimming difficult and causes waste of the grouting material.

[0040] To solve the above problems, the present application provides a secondary grouting formwork for the wind turbine foundation and a wind turbine foundation. The secondary grouting formwork is formed by enclosing an outer annular side plate and an inner annular side plate that are inclined, so that an inclined surface is directly formed after the secondary grouting matrix is poured and formed, avoiding subsequent trimming, improving the construction efficiency, saving the use of the grouting material at the same time, and reducing waste; at the same time, the positions of the outer annular side plate and the inner annular side plate are positioned by the first positioning member and the second positioning member, so as to fix the outer annular side plate and the inner annular side plate at the required positions; while providing a connection method, the first connecting plate and the second connecting plate strengthen the strength of the outer annular side plate and the inner annular side plate, so as to reduce the deformation of the outer annular side plate and the inner annular side plate.

[0041] The following takes specific embodiments to detail the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0042] On the one hand, the present application provides a secondary grouting formwork for a wind turbine foundation. Referring to Figure 1 and Figure 2 , the secondary grouting formwork for the wind turbine foundation includes an outer annular side plate 100, an inner annular side plate 200, a first positioning member 300, and a second positioning member 400.

[0043] The inner annular side plate 200 is located inside the outer annular side plate 100 and they are concentrically arranged. Both the outer annular side plate 100 and the inner annular side plate 200 are inclined. The distance from the top of the outer annular side plate 100 to the top of the inner annular side plate 200 is less than the distance from the bottom of the outer annular side plate 100 to the bottom of the inner annular side plate 200. The first positioning member 300 is used to position the outer annular side plate 100, and the second positioning member 400 is used to position the inner annular side plate 200.

[0044] Specifically, the outer annular side plate 100 and the inner annular side plate 200 are inclined towards the direction of approaching each other. The cross-sections of the outer annular side plate 100 and the inner annular side plate 200 are isosceles trapezoids, and the lower base of the isosceles trapezoid is connected to the fan base body.

[0045] The template is formed by enclosing with the inclined outer annular side plate 100 and the inner annular side plate 200, so that the secondary grouting matrix 800 directly forms an inclined plane after being poured and formed, avoiding subsequent trimming, improving the construction efficiency, saving the use of grouting materials at the same time, and reducing waste. At the same time, the positions of the outer annular side plate 100 and the inner annular side plate 200 are positioned by the first positioning member 300 and the second positioning member 400, so as to fix the outer annular side plate 100 and the inner annular side plate 200 at the required positions.

[0046] In some embodiments, the angle between the outer annular side plate 100 and the inner annular side plate 200 and the horizontal plane is greater than or equal to 50° and less than or equal to 55°.

[0047] Exemplarily, the angles between the outer annular side plate 100 and the inner annular side plate 200 and the horizontal plane are both 50°, so as to reduce the use of grouting while ensuring the strength of the secondary grouting matrix 800 and save materials. In other embodiments, different inclination angles can be selected according to actual situations, and no excessive restrictions are made here.

[0048] Refer to Figure 1 、 Figure 2 and Figure 3 , the first positioning member 300 includes a plurality of first positioning bolts. The first positioning bolts are used to be preset on the fan foundation body 500 to position the outer annular side plate 100, and the first positioning bolts are connected to the outer annular side plate 100.

[0049] Specifically, the first positioning bolts are pre-cast on the fan foundation body 500 and partially extend outside the fan foundation body 500. The first positioning bolts are located outside the outer annular side plate 100. A plurality of ear plates are welded and fixed at the outer bottom of the outer annular side plate 100, and the first positioning bolts pass through the ear plates to connect the outer annular side plate 100.

[0050] The number of the first positioning bolts is not less than three to facilitate the accurate positioning of the outer annular side plate 100. In this application, the number of the first positioning bolts is set to six. In other embodiments, the number of the first positioning bolts can be set differently according to actual requirements to achieve the positioning of the outer annular side plate 100.

[0051] Referring to Figure 1 、 Figure 2 and Figure 3 , the second positioning member 400 includes a plurality of second positioning bolts, and the second positioning bolts are used to be preset on the fan foundation body 500 to position the inner annular side plate 200, and the second positioning bolts are connected to the inner annular side plate 200.

[0052] Specifically, the second positioning bolts are pre-cast on the fan foundation body 500 and partially extend outside the fan foundation body 500. The second positioning bolts are located inside the inner annular side plate 200. A plurality of ear plates are also welded and fixed to the inner bottom of the inner annular side plate 200, and the second positioning bolts pass through the ear plates to connect the inner annular side plate 200.

[0053] The number of the second positioning bolts is not less than three to facilitate the accurate positioning of the inner annular side plate 200. In this application, the number of the second positioning bolts is set to six. In other embodiments, the number of the second positioning bolts can be set differently according to actual requirements to achieve the positioning of the inner annular side plate 200.

[0054] Referring to Figure 3 and Figure 4 , the outer annular side plate 100 includes a plurality of outer arc plates 110, a plurality of first rib plates 130 and a plurality of first connecting members 120. The outer arc plates 110 are connected end to end to enclose a ring, the first rib plates 130 are arranged on the outer side wall of the outer arc plates 110, and the first connecting members 120 are arranged on the outer arc plates 110 to connect two adjacent outer arc plates 110.

[0055] Exemplarily, the outer arc plate 110 is an aluminum plate, the height of the outer arc plate 110 is 80 mm, and in this application, 14 outer arc plates 110 are provided. The 14 outer arc plates 110 are connected end to end to form a ring. Further, the outer arc plate 110 is formed by welding a plurality of panels to improve the splicing efficiency. A plurality of first rib plates 130 are welded and fixed on the outer side wall of the outer arc plate 110 to strengthen the strength of the outer arc plate 110 and reduce the deformation of the outer arc plate 110.

[0056] Wherein, the first connecting member 120 includes a first connecting bolt 121 and first connecting plates 122 arranged at both ends of the outer arc plate 110. The first connecting bolt 121 passes through the two adjacent first connecting plates 122 of two adjacent outer arc plates 110 to connect the two adjacent outer arc plates 110.

[0057] The first connecting plate 122 is welded and fixed to the outer side wall of the outer arc-shaped plate 110. When two adjacent outer arc-shaped plates 110 are spliced, the first connecting plates 122 at both ends abut against each other, and the first connecting bolts 121 pass through the two first connecting plates 122 to connect and fasten the two first connecting plates 122, thereby realizing the connection of two adjacent outer arc-shaped plates 110.

[0058] Moreover, two first connecting bolts 121 are arranged on the same first connecting plate 122, thereby enhancing the stability of the connection between two adjacent outer arc-shaped plates 110.

[0059] Refer to Figure 3 and Figure 5 As shown in FIGS. and, the inner annular side plate 200 includes a plurality of inner arc-shaped plates 210, a plurality of second rib plates 230 and a plurality of second connecting members 220. The inner arc-shaped plates 210 are connected end to end to form a ring, the second rib plates 230 are arranged on the inner side wall of the inner annular side plate 200, and the second connecting members 220 are arranged on the inner arc-shaped plates 210 for connecting two adjacent inner arc-shaped plates 210.

[0060] Exemplarily, the inner arc-shaped plate 210 is an aluminum plate, the height of the inner arc-shaped plate 210 is 80 mm, and in the present application, 12 inner arc-shaped plates 210 are provided. The 12 inner arc-shaped plates 210 are connected end to end to form a ring. Further, the inner arc-shaped plate 210 is formed by welding a plurality of panels. A plurality of second rib plates 230 are welded and fixed to the inner side wall of the inner arc-shaped plate 210 to enhance the strength of the inner arc-shaped plate 210 and reduce the deformation of the inner arc-shaped plate 210.

[0061] Refer to Figure 3 and Figure 5 As shown in FIGS. and, the second connecting member 220 includes a second connecting bolt 221 and second connecting plates 222 arranged at both ends of the inner arc-shaped plate 210. The second connecting bolt 221 passes through the adjacent second connecting plates 222 of two adjacent inner arc-shaped plates 210 to connect the two adjacent inner arc-shaped plates 210.

[0062] The second connecting plates 222 are welded and fixed to the inner side wall of the inner arc-shaped plate 210. When two adjacent inner arc-shaped plates 210 are spliced, the second connecting plates 222 at both ends abut against each other, and the second connecting bolt 221 passes through the two second connecting plates 222 to connect and fasten the two second connecting plates 222, thereby realizing the connection of adjacent inner arc-shaped plates 210.

[0063] Moreover, two second connecting bolts 221 are arranged on the same second connecting plate 222, thereby enhancing the stability of the connection of the inner arc-shaped plates 210.

[0064] On the other hand, refer to Figure 1 、 Figure 2 andFigure 3 , the present application provides a wind turbine foundation, which includes a wind turbine foundation body 500, anchor bolts 600, anchor plates 700, and a secondary grouting matrix 800 formed by using the above-mentioned secondary grouting template. The anchor plate 700 is arranged on the secondary grouting matrix 800, and the anchor bolts 600 are preset on the wind turbine foundation body 500 and pass through the secondary grouting matrix 800 to be connected with the anchor plate 700.

[0065] Among them, a protective layer is coated on the secondary grouting matrix 800. The protective layer is ordinary grade epoxy coal tar pitch, and the dry film thickness of the protective layer is not less than 300 μm to play a protective role.

[0066] The construction process of the secondary grouting template and the wind turbine foundation provided by the present application is as follows:

[0067] First, determine the number of outer arc plates 110 and inner arc plates 210 according to actual needs, and then carry out production. After the first set of templates are produced, select a flat site for trial assembly, and use a steel tape measure and a triangular ruler to measure and check the length, height, diameter, and bevel angle of the customized templates. Among them, the assembly gap of the templates does not exceed ±2 mm. According to the trial assembly situation of the templates, adjust the processing parameters and correct the template errors, and then mass-produce the templates.

[0068] Then, before pouring the wind turbine foundation body 500, weld the first positioning bolts and the second positioning bolts on the steel reinforcement cage of the wind turbine foundation body 500. The first positioning bolts and the second positioning bolts to be embedded are both 18 cm long and 3 cm are exposed, and the exposed sections need to be wrapped with anti-pollution adhesive tape.

[0069] Pour to form the wind turbine foundation body 500, and use an electronic level to check the flatness of the installed anchor plate 700. The flatness should be within the range of ±2 mm; clean the area between the two rows of embedded first positioning bolts and second positioning bolts. This area is the secondary grouting area. Use a scarifier or a hand-held impact drill to fully roughen the grouting area. Use a high-pressure water gun to clean the crushed stones, oil stains, floating ash, and floating slurry in the roughened grouting area, and use a cotton cloth to clean the accumulated water. Only after applying a release agent on the secondary grouting template can it be installed.

[0070] Remove the adhesive tape from the first fixing bolt and the second fixing bolt. Paste double-sided adhesive strips between two adjacent outer arc-shaped plates 110, and also paste double-sided adhesive strips between two adjacent inner arc-shaped plates 210. Clean the template installation area. A double-sided adhesive or a foam filler should be pasted on the contact surface between the bottom of the template and the fan foundation body 500 to prevent slurry leakage. Pass the ear plates on the outer ring side plate 100 through the first positioning bolt and fix them with nuts. Pass the ear plates on the inner ring side plate 200 through the second positioning bolt and fix them with nuts. At the same time, splice the outer ring side plate 100 and the inner ring side plate 200 into a whole, and review, check and accept the position, size and joints of the installed customized template.

[0071] Carry out secondary grouting construction. The surface of the foundation concrete should be fully wetted 24 hours before grouting, and there should be no accumulated water 1 hour before grouting. The mixing water for secondary grouting should be clean water, and it should be fully stirred evenly and the air bubbles should be removed. The grouting material should be a non-shrinking grouting material. Calculate the usage amount of the grouting material and the water consumption according to the grouting material instruction manual, strictly control the stirring duration and the number of stirring times, and no secondary water addition is allowed during the process. During secondary grouting, grouting should be carried out from one side until it overflows from the other side, and grouting should not be carried out simultaneously from opposite sides. After grouting starts, it must be carried out continuously. After grouting is completed, use a spatula to finish the upper surface in time, sprinkle water for curing, cover with a film to avoid shrinkage cracks, and water curing is strictly prohibited.

[0072] Finally, apply ordinary grade epoxy coal tar pitch on the surface of the secondary grouting matrix 800 after it reaches the design strength of 110 Mpa, and the dry film thickness should not be less than 300 μm.

[0073] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0074] It should be understood that the present application is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A secondary grouting template for a fan foundation, characterized in that: It includes an outer annular side plate, an inner annular side plate, a first positioning member and a second positioning member; The inner annular side plate is located inside the outer annular side plate and the two are arranged concentrically, the outer annular side plate and the inner annular side plate are both arranged obliquely, the distance from the top of the outer annular side plate to the top of the inner annular side plate is smaller than the distance from the bottom of the outer annular side plate to the bottom of the inner annular side plate, the first positioning member is used to position the outer annular side plate, and the second positioning member is used to position the inner annular side plate.

2. The secondary grouting template for fan foundation according to claim 1 is characterized in that: The included angle between the outer annular side plate and the inner annular side plate and the horizontal plane is greater than or equal to 50° and less than or equal to 55°.

3. The secondary grouting template for fan foundation according to claim 1 is characterized in that: The first positioning member includes a plurality of first positioning bolts, which are used to be preset on the fan base body to position the outer annular side plate, and the first positioning bolts are connected to the outer annular side plate.

4. The secondary grouting template for fan foundation according to claim 1 is characterized in that: The second positioning member includes a plurality of second positioning bolts, and the second positioning bolts are used to be preset on the fan base body to locate the position of the inner annular side plate, and the second positioning bolts are connected to the inner annular side plate.

5. The secondary grouting template for fan foundation according to any one of claims 1 to 4, characterized in that: The outer annular side plate includes multiple outer arc plates, multiple first rib plates and multiple first connecting parts. The outer arc plates are connected end to end to form a circular ring. The first rib plates are arranged on the outer side walls of the outer arc plates. The first connecting part is arranged on the outer arc plate to connect two adjacent outer arc plates.

6. The secondary grouting template for fan foundation according to claim 5 is characterized in that: The first connecting member includes a first connecting bolt and first connecting plates arranged at both ends of the outer arc-shaped plate. The first connecting bolt passes through adjacent first connecting plates of two adjacent outer arc-shaped plates to connect the adjacent outer arc-shaped plates.

7. The secondary grouting template for fan foundation according to any one of claims 1 to 4, characterized in that: The inner annular side plate includes a plurality of inner arc plates, a plurality of second rib plates and a plurality of second connecting members. The inner arc plates are connected end to end to form a circular ring. The second rib plates are arranged on the inner side walls of the inner arc plates. The second connecting members are arranged on the inner arc plates to connect two adjacent inner arc plates.

8. The secondary grouting template for fan foundation according to claim 7 is characterized in that: The second connecting member includes a second connecting bolt and second connecting plates arranged at both ends of the inner arc-shaped plate, and the second connecting bolt passes through the adjacent second connecting plates of two adjacent inner arc-shaped plates to connect the adjacent inner arc-shaped plates.

9. A fan foundation, characterized in that: It comprises a wind turbine foundation body, anchor bolts, anchor plates and a secondary grouting matrix formed using the secondary grouting template as described in any one of claims 1 to 8, wherein the anchor plate is arranged on the secondary grouting matrix, the anchor bolts are preset on the wind turbine foundation body and pass through the secondary grouting matrix to be connected with the anchor plate.

10. The wind turbine foundation according to claim 9, characterized in that: A protective layer is coated on the secondary grouting substrate.

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