A method for expanding capacity of a land-based wind power foundation structure using an additional water tank

Abstract

This invention relates to a method for expanding the capacity of an onshore wind power foundation structure using an external water tank. The original wind power foundation structure is a common wind power extension foundation, including an original foundation ring with annular anchor plates welded to the top and bottom. The inner side of the original foundation ring is cast into the original central column, and the outer side of the original foundation ring is cast into the original external column. An expansion flange, an expansion tower flange, and a new tower are sequentially fixedly installed on the original foundation ring. Several tower cross braces and several annular water tanks that penetrate the tower cross braces are evenly arranged around the expansion flange. A new central column for fixing the tower cross braces is cast into the outer side of the expansion tower flange. An expansion plate is installed outside the original extension foundation, and support rods are fixedly installed at the bottom of the annular water tanks. This wind power foundation structure mainly expands the foundation capacity and anti-overturning performance by filling prefabricated water tanks with water, using expansion plates, rods, and cables to improve the foundation's bearing capacity and anti-overturning performance. This method is more convenient and faster to construct, and reduces material and construction costs.

Description

Technical Field

[0001] This invention belongs to the field of wind power foundation technology, and particularly relates to a method for expanding onshore wind power foundations using an external water tank. Background Technology

[0002] Wind energy, as a clean and environmentally friendly renewable energy source, has attracted attention. Among them, onshore wind power accounts for the majority of the entire wind power market. As large-capacity wind turbines gradually become the mainstream, the economic benefits of previously built wind turbine units are limited due to their low installed capacity. However, most of the early wind farms have good wind energy resources, and upgrading or expanding existing wind farms can make effective use of these resources.

[0003] Replacing the upper wind turbine generators and reinforcing and expanding the lower foundation structure is one way to increase the overall installed capacity of a wind farm. Currently, expanding the capacity of wind turbine generators often requires increasing the diameter of the turbine tower. After the tower diameter is increased, the existing onshore wind turbine foundation cannot be easily and reliably connected to the expanded tower. Usually, it is necessary to demolish the existing onshore wind turbine foundation and rebuild a new one with a correspondingly larger diameter. This reconstruction of the new onshore wind turbine foundation presents problems such as high cost, long construction period, large excavation, and difficulty in replacing prestressed anchor bolt components.

[0004] Therefore, there is an urgent need to develop a technology that can make full use of wind turbine foundations that have not yet reached their designed service life, and facilitate rapid expansion and renovation of the foundations. This would avoid the problems of high cost, long construction period, large excavation, and difficulty in replacing prestressed anchor bolt components that would result from redesigning and rebuilding the substructure during future expansion and renovation. Summary of the Invention

[0005] In view of this, in order to solve the problems of high cost, long construction period, large excavation, and difficulty in replacing prestressed anchor bolt components that usually require the demolition of the existing onshore wind power foundation and reconstruction of a new onshore wind power foundation with a correspondingly larger diameter when expanding the capacity of existing wind turbines, the present invention provides a method for expanding the capacity of onshore wind power foundations by adding an external water tank.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An expansion method for onshore wind power foundations using an external water tank system is disclosed. This method involves directly expanding the existing wind power foundation on its original site. The existing wind power foundation is a common extended foundation, consisting of an original foundation ring with annular anchor plates welded to the top and bottom. The inner side of the original foundation ring is cast into the original central column, and the outer side is cast into the original external column. The outer side of the original external column is the original extended foundation. An expansion flange, an expansion tower flange, and a new tower are sequentially fixedly installed on the original foundation ring. Several tower cross braces and several annular water tanks that penetrate the tower cross braces are evenly arranged around the expansion flange. A new central column for fixing the tower cross braces is cast into the outer side of the expansion tower flange. An expansion plate is installed outside the original extended foundation, and support rods are fixedly installed at the bottom of the annular water tanks. The support rods are fixed by pouring concrete outside the original extended foundation to form the expansion plate.

[0008] Furthermore, a water tank pull ring is fixedly installed on the top of the annular water tank, and a tower pull ring is fitted on the new tower. The tower pull ring is connected to the corresponding water tank pull ring on the top of the annular water tank by a tower cable.

[0009] Furthermore, each annular water tank has a water filling hole at the top. Benefit: After filling the corresponding annular water tank with water through the water filling hole, it can be sealed.

[0010] Furthermore, a slot is provided at the connection point of adjacent annular water tanks, and a fixing post is fixedly installed in the slot. An additional steel plate is fitted onto the fixing post. Beneficial effect: By clamping the additional steel plate onto the fixing post of the adjacent annular water tank, the adjacent annular water tanks are fixedly connected.

[0011] Furthermore, the original foundation ring has two rings of bolt holes on its upper and lower annular anchor plates. The inner bolt holes are connected to the expansion flange via connecting bolt I. The expansion flange has four layers of bolt holes in its circumferential direction. The innermost bolt holes are connected to the inner bolt holes on the original foundation ring via connecting bolt I. New tower connecting anchors are inserted through the second and fourth bolt holes from the innermost layer of the expansion flange. The upper expansion tower flange is connected through these new tower connecting anchors. Fixing bolts are inserted through the third bolt hole from the innermost layer of the expansion flange. The expansion flange is welded and fixed to the expansion tower flange through the fixing bolts.

[0012] Furthermore, the connection between the tower cross brace and the annular water tank is fixed by connecting bolt II.

[0013] A method for expanding the capacity of onshore wind power foundations using an external water tank includes the following steps:

[0014] S1. After removing the original wind turbine foundation tower, leave the original foundation ring. Connect the expansion flange to the original foundation ring with connecting bolt I. Fix the expansion flange and the expansion tower flange with fixing bolts, and then fix them with new tower connecting anchor bolts. The new tower connecting anchor bolts pass through the corresponding bolt holes on the expansion tower flange and are then connected to the new tower.

[0015] S2. After pre-embedding several tower cross braces around the expansion flange, pour concrete on the outside of the expansion flange to form a new central support column, which will fix the tower cross braces.

[0016] S3. Install an annular water tank on the outside of the tower cross brace. The side of the annular water tank closest to the tower cross brace is fixedly connected to the corresponding tower cross brace by connecting bolt II. At the same time, the support rod at the bottom of the annular water tank is located outside the original extended foundation. The annular water tank is fixed by pouring concrete outside the original extended foundation.

[0017] S4. A tower pull ring is installed on the new tower. The tower pull ring is connected to the corresponding pull ring on the top of the annular water tank by a tower cable, which improves the installation stability of the annular water tank and the new tower.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. The method for expanding the onshore wind power foundation structure with an external water tank disclosed in this invention adds an annular water tank to the periphery of the original wind power foundation. The flow of water in the annular water tank improves the stability of the wind power foundation. The end of the tower cross brace connected to the inner side of the annular water tank is cast into the new central column, improving the connection stability between the tower cross brace and the new central column. The bottom support rod of the annular water tank is cast into the expansion plate outside the original extended foundation. The extension plate improves the bearing capacity of the entire expanded wind power foundation, and the connection stability of the entire annular water tank is guaranteed. This expansion method makes full use of the original wind turbine foundation. When expanding and upgrading the wind turbine generator, it avoids the waste of concrete, steel bars and other materials and the unnecessary large-scale excavation and backfilling work caused by replacing the original foundation. It also eliminates the need to apply for additional permanent land acquisition, significantly saving investment costs.

[0020] 2. The method for expanding the onshore wind power foundation structure with an external water tank disclosed in this invention involves installing a tower pull ring on the new tower. The tower pull ring is connected to the corresponding annular water tank top pull ring via a tower cable, which improves the installation stability of the annular water tank and also improves the stability of the expanded new tower. After the original wind power foundation tower is removed, an expansion flange, an expansion tower flange, and a new tower are sequentially fixed on the original foundation ring. By selecting different expansion flanges and expansion tower flanges, new wind power towers of different diameters can be adapted, making the entire wind power tower more adaptable during expansion.

[0021] In summary, compared with existing technologies, the onshore wind power foundation expansion method with external water tank provided by this invention is scientifically designed. It can make full use of wind turbine foundations that have not yet reached their design service life, facilitate rapid expansion and renovation of the foundation, flexibly adjust the filling water volume to meet overturning resistance requirements, and allow the same water tank to adapt to different capacity expansion schemes, reducing costs. Furthermore, it avoids the problems of high cost, long construction period, large excavation, and difficulty in replacing prestressed anchor bolt components that would result from redesigning and rebuilding the lower foundation structure during future expansion and renovation. This method has significant practical implications.

[0022] By applying this invention, the existing wind turbine foundations of wind farms can be fully utilized, avoiding the damage to the original soil caused by replacing the original wind turbine foundations, providing convenience for future expansion and renovation of wind turbine foundations, and improving their economic and social benefits.

[0023] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of the original foundation ring in the existing wind power foundation structure of this invention;

[0026] Figure 2 For the present invention Figure 1 A structural diagram of the column foundation in the original wind turbine foundation structure;

[0027] Figure 3 For the present invention Figure 2 A schematic diagram of the structure in which an extended foundation is installed on the outside of the original wind turbine foundation;

[0028] Figure 4 For the present invention Figure 3 A schematic diagram of the original wind turbine foundation structure after the expansion of the foundation ring.

[0029] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of the embedded tower cross brace;

[0030] Figure 6 For the present invention Figure 5 Schematic diagram of the structure with added ring-shaped water tank Figure 1;

[0031] Figure 7 For the present invention Figure 5 Schematic diagram of the structure with added ring-shaped water tank Figure 2 ;

[0032] Figure 8 For the present invention Figure 7 Schematic diagram of the structure with the expansion panel added;

[0033] Figure 9 This is a schematic diagram of the expanded onshore wind power foundation structure with an external water tank, as per the present invention.

[0034] Figure 10 For the present invention Figure 9 A schematic diagram of the structure of the central ring-shaped water tank.

[0035] Reference numerals: Connecting bolt I 11, Original central column 12, Original foundation ring 13, Original external column 14, Original extended foundation 15, Expansion flange 21, New tower connecting anchor bolt 22, Expansion tower flange 23, New central column 24, Tower cross brace 25, Annular water tank 26, Connecting bolt II 27, Expansion plate 28, New tower 31, Tower cable 32, Tower tie ring 33, Water tank tie ring 34, Support rod 35, External steel plate 36, Water injection hole 37. Detailed Implementation

[0036] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0038] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0039] like Figures 1-3 The existing wind power foundation structure shown includes an original foundation ring 13 with annular anchor plates welded to the top and bottom. The inner side of the original foundation ring 13 is cast into the original central column 12, and the outer side of the original foundation ring 13 is cast into the original outer column 14. The outer side of the original outer column 14 is the original extended foundation 15. The upper and lower annular anchor plates of the original foundation ring 13 have two rings of bolt holes, one inner and one outer. The inner bolt holes are connected to the expansion flange 21 by connecting bolt I11. The expansion flange 21 has four layers of bolt holes in the circumferential direction. The innermost bolt hole is connected to the inner bolt hole on the original foundation ring 13 by connecting bolt I11. The expansion flange 21 has new tower connecting anchor bolts 22 penetrating through the second and fourth bolt holes from the innermost layer. The upper expansion tower flange 23 is connected through the new tower connecting anchor bolts 22. The outer side of the expansion tower flange 23 is cast into the new central column 24. The expansion flange 21 is fitted with fixing bolts through the third bolt hole from the innermost layer. The expansion flange 21 is then welded and fixed to the expansion tower flange 23 using the fixing bolts. The fixing bolts determine the connection height between the expansion flange 21 and the expansion tower flange 23, which is the height of the new central column 24.

[0040] Several tower cross braces 25 and several annular water tanks 26, which are connected to the tower cross braces 25, are evenly arranged around the new central column 24. The connection between the tower cross braces 25 and the annular water tanks 26 is fixed by connecting bolts II 27. An expansion plate 28 is installed outside the original extended foundation 15, and a support rod 35 is fixedly installed at the lower part of the annular water tanks 26. The support rod 35 is fixed by pouring concrete outside the original extended foundation 15 to form the expansion plate 28. The tower cross braces 25 can be fixed when the new central column is cast.

[0041] The expansion tower flange 23 on the new central support column 24 has two layers of bolt holes in the circumferential direction. The new tower connecting anchor bolt 22 passes through the bolt holes of the expansion tower flange 23 and the expansion flange 21 respectively and is fixedly connected to the new tower 31.

[0042] A water tank pull ring 34 is fixedly installed on the top of the annular water tank 26, and a tower pull ring 33 is fitted on the new tower 31. The tower pull ring 33 and the corresponding water tank pull ring 34 on the top of the annular water tank 26 are connected by a tower cable 32. Each annular water tank 26 has a water injection hole 37 on its top. After the corresponding annular water tank 26 is filled with water through the water injection hole 37, it is sealed. The water in the annular water tank 26 can flow between the annular water tank 26 and the corresponding tower cross brace 25, improving the stability of the entire expanded wind power foundation. A slot is provided at the connection between adjacent annular water tanks 26, and a fixing column is fixedly installed in the slot. An external steel plate 36 is fitted on the fixing column. The external steel plate 36 is snapped onto the fixing column of the adjacent annular water tank 26 to achieve a fixed connection between the adjacent annular water tanks 26.

[0043] like Figures 4-10 The method for expanding the capacity of onshore wind power foundations with external water tanks includes the following steps:

[0044] S1. After removing the original wind turbine foundation tower, leave the original foundation ring 13. Connect the expansion flange 21 to the original foundation ring 13 with connecting bolt I11. The expansion flange 21 and the expansion tower flange 23 are fixed with fixing bolts and then fixed with new tower connecting anchor bolts 22. The new tower connecting anchor bolts 22 pass through the corresponding bolt holes on the expansion tower flange 23 and are then connected to the new tower 31.

[0045] S2. After pre-embedding several tower cross braces 25 around the expansion flange 21, pour concrete on the outside of the expansion flange 21 to form a new central support column 24, which fixes the tower cross braces 25.

[0046] S3. An annular water tank 26 is installed on the outside of the tower cross brace 25. The annular water tank 26 is integrally formed with a water outlet pipe on the side near the tower cross brace 25. The water outlet pipe is fixedly connected to the corresponding tower cross brace 25 by connecting bolt II 27. At the same time, the support rod 35 at the bottom of the annular water tank 26 is located outside the original extended foundation 15. The annular water tank 26 is fixed by pouring concrete outside the original extended foundation 15.

[0047] S4. A tower pull ring 33 is installed on the new tower 31. The tower pull ring 33 is connected to the corresponding annular water tank 26 top water tank pull ring 34 by a tower cable 32, which improves the installation stability of the annular water tank 26.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for expanding the capacity of a land-based wind power foundation structure using an external water tank, which directly expands on the original site of an existing wind power foundation structure, the existing wind power foundation structure being a common expanded foundation, the existing wind power foundation structure comprising a foundation ring with a ring-shaped anchor plate welded on the top and bottom, an original center column formed by pouring and shaping on the inner side of the foundation ring, an original outer column formed by pouring and shaping on the outer side of the foundation ring, and an original expanded foundation on the outer side of the original outer column, characterized in that, An expansion flange, an expansion tower flange, and a new tower are sequentially fixed on the original foundation ring. Several tower cross braces and several arc-shaped water tanks connected to the tower cross braces are evenly arranged around the expansion flange, and the tower cross braces and water tanks correspond one-to-one. Several arc-shaped water tanks are spliced ​​together to form a large ring-shaped water tank. A new central column for fixing the tower cross braces is cast on the outside of the expansion tower flange. An expansion plate is installed outside the original expansion foundation. A support rod is fixedly installed at the bottom of the arc-shaped water tank. The support rod is fixed by the expansion plate formed by pouring concrete outside the original expansion foundation.

2. The method of claim 1, wherein the method is performed by using an additional water tank type of land-based wind power foundation structure. A water tank pull ring is fixedly installed on the top of the arc-shaped water tank, and a tower pull ring is fitted on the new tower. The tower pull ring and the corresponding water tank pull ring on the top of the arc-shaped water tank are connected by a tower cable.

3. The method of claim 1, wherein the method is performed by using an additional water tank type of land-based wind power foundation structure. Each of the aforementioned arc-shaped water tanks has a water injection hole on its top.

4. The method of claim 1, wherein the method is performed by using an additional water tank type of land-based wind power foundation structure. A slot is provided at the connection between adjacent arc-shaped water tanks, and a fixing column is fixedly installed in the slot. An additional steel plate is fitted on the fixing column.

5. The method for expanding the capacity of onshore wind power foundations using an external water tank as described in claim 2, characterized in that, The original foundation ring has two rings of bolt holes on its upper and lower annular anchor plates. The inner bolt holes are connected to the expansion flange via connecting bolt I. The expansion flange has four layers of bolt holes on its circumference. The innermost bolt hole is connected to the inner bolt hole on the original foundation ring via connecting bolt I. The expansion flange has new tower connecting anchor bolts that pass through the second and fourth bolt holes from the innermost layer. The upper expansion tower flange is connected via these new tower connecting anchor bolts. The expansion flange has fixing bolts inserted into the third bolt hole from the innermost layer. The expansion flange is welded and fixed to the expansion tower flange via these fixing bolts.

6. The method for expanding the capacity of onshore wind power foundations using an external water tank as described in claim 5, characterized in that, The connection between the tower cross brace and the arc-shaped water tank is fixed by connecting bolt II.

7. The method for expanding the capacity of onshore wind power foundations using an external water tank as described in claim 6, characterized in that, Includes the following steps: S1. After removing the original wind turbine foundation tower, leave the original foundation ring. Connect the expansion flange to the original foundation ring with connecting bolt I. Fix the expansion flange and the expansion tower flange with fixing bolts, and then fix them with new tower connecting anchor bolts. The new tower connecting anchor bolts pass through the corresponding bolt holes on the expansion tower flange and are then connected to the new tower. S2. After pre-embedding several tower cross braces around the expansion flange, pour concrete on the outside of the expansion flange to form a new central support column, which will fix the tower cross braces. S3. Install an arc-shaped water tank on the outside of the tower cross brace. The side of the arc-shaped water tank closest to the tower cross brace is fixedly connected to the corresponding tower cross brace by connecting bolt II. At the same time, the support rod at the bottom of the arc-shaped water tank is located outside the original extended foundation. The ring-shaped water tank is fixed by pouring concrete outside the original extended foundation. S4. A tower pull ring is installed on the new tower. The tower pull ring is connected to the corresponding arc-shaped water tank top pull ring by a tower cable, which improves the installation stability of the annular water tank and the new tower.

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