A method for expanding the foundation of a wind power base on its original site and its construction.

Abstract

This invention relates to a wind power foundation for on-site expansion, comprising an anchor bolt foundation ring fitted outside the original foundation ring. The anchor bolt foundation ring includes a lower anchor plate, an upper anchor plate used in conjunction with the lower anchor plate, and several prestressed anchor bolts connecting the upper and lower anchor plates. Several sets of coupling steel components I are uniformly fixed circumferentially to the connection between the lower anchor plate and the original foundation ring. Coupling steel components II are welded to the outer side of the lower anchor plate at positions corresponding to the coupling steel components I. Multiple sets of U-shaped connectors with their free ends anchored in the original foundation are uniformly arranged along the length of the coupling steel components I and II. Reinforcing mesh is distributed at the original foundation, the outermost position of the coupling steel components II, the position where the coupling steel components II connect to the lower anchor plate, and the position where the coupling steel components I connect to the original foundation ring. This expansion foundation expands and reinforces the original wind farm on-site, making full and effective use of the original foundation and reducing the construction period and construction costs.

Description

Technical Field

[0001] This invention belongs to the field of wind power foundation structure design and construction, and relates to a method for expanding an existing wind power foundation on its original site. Background Technology

[0002] Wind energy is an inexhaustible and renewable clean energy source, and wind power generation is one of the most promising sustainable projects in the world. To ensure the sustainable development of wind power generation, the wind turbine foundation used to install and fix the wind turbine tower is the key.

[0003] However, land resources are finite, and building wind farms on land also faces challenges such as land scarcity and complex geological conditions. Due to technological limitations, early wind farms often suffered from undersized turbine generator units, and these early wind farms were often located in areas with abundant wind resources, leading to a certain degree of waste. Upgrading and renovating low-capacity, aging wind farms can effectively utilize resources and prevent the waste of manpower and resources caused by large-scale demolition of existing turbine foundations. Most of my country's early wind turbine units have been in operation for over 15 years, resulting in long overall operating times, severe equipment aging, and low power generation efficiency. A large-scale decommissioning is expected in the next ten to fifteen years, and the disposal of the existing foundations will become a new challenge.

[0004] Therefore, given the limitations on the use of existing wind power equipment, it is essential to upgrade and renovate low-capacity, outdated foundations. There is an urgent need to develop a renovation structure suitable for existing wind turbine foundations and its supporting construction methods to expand and reinforce the original wind farm on the original site. This would allow for full and effective utilization of the existing foundations, reducing construction time and costs. Summary of the Invention

[0005] In view of this, in order to solve the problems of small capacity and aging of early wind turbine power plants, and the fact that the wind turbines of the existing wind farms have not reached their designed service life and cannot meet the growing market demand, it is necessary to expand and renovate the original wind power foundation within its service life in order to make full use of wind energy. This invention provides a method for expanding the original wind power foundation on the same site and its construction.

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

[0007] A wind power foundation expansion project includes an anchored foundation ring fitted outside the original foundation ring. The anchored foundation ring includes an I-shaped lower anchor plate, an upper anchor plate used in conjunction with the lower anchor plate, and several prestressed anchors connecting the upper and lower anchor plates. Several sets of coupling steel components I are uniformly fixed circumferentially to the connection between the lower anchor plate and the original foundation ring. Coupling steel components II are welded to the outer side of the lower anchor plate at positions corresponding to the coupling steel components I. Multiple sets of U-shaped connectors with free ends anchored in the original foundation are uniformly arranged along the length of the coupling steel components I and II. Reinforcing mesh is distributed at the original foundation, the outermost position of the coupling steel component II, the position where the coupling steel component II connects to the lower anchor plate, and the position where the coupling steel component I connects to the original foundation ring.

[0008] Furthermore, the lower anchor plate includes an annular web and upper and lower side plates welded to the upper and lower ends of the annular web respectively. One end of the coupling steel component I is welded to the original foundation ring, and the other end is welded to the annular web and lower side plate inside the lower anchor plate; one end of the coupling steel component II is welded to the annular web and lower side plate outside the lower anchor plate.

[0009] Furthermore, the ends of coupling steel components I and II near the lower side plate are stepped, which facilitates welding with the lower side plate of the lower anchor plate.

[0010] Furthermore, both coupling steel component I and coupling steel component II are I-beams, and the U-shaped connectors are U-shaped steel bars.

[0011] Furthermore, the lower anchor plate has several rings of steel bars wrapped around its annular web. These steel bars can transfer force to the entire lower anchor plate, making the lower anchor plate and the newly poured foundation more integrated.

[0012] Furthermore, anchor bolt holes are provided at corresponding positions on the upper anchor plate and the lower side plate. After inserting suitable prestressed anchor bolts into the corresponding anchor bolt holes, they are fixed by bolt fasteners to form an anchor bolt cage.

[0013] Furthermore, the reinforcing mesh has holes at the locations of coupling steel member I, coupling steel member II, and the annular web. The connection between the reinforcing mesh and coupling steel member I, coupling steel member II, and the annular web is also made through openings, which makes the connection between the reinforcing mesh and coupling steel member I, coupling steel member II, and the annular web more secure.

[0014] A construction method for expanding a wind turbine foundation on its original site includes the following steps:

[0015] S1. Retain the original foundation and original foundation ring, and remove the original foundation columns;

[0016] S2. Arrange rebar installation areas in the remaining part of the original foundation, namely, the rebar installation areas are located on the outside of the extended part of the original foundation, the slope of the original foundation, and the part of the original foundation where the columns have been removed.

[0017] S3. Install a lower anchor plate outside the original foundation ring. The lower anchor plate is fixedly connected to the original foundation ring through a coupling steel component I. That is, one end of the coupling steel component I is welded to the original foundation ring, and the other end is welded to the annular web plate and the lower side plate inside the lower anchor plate.

[0018] S4. Several turns of steel bars are wrapped around the annular web of the lower anchor plate. Coupled steel component II is welded to the outer side of the lower anchor plate at the position corresponding to the coupling steel component I. Coupled steel component I and coupling steel component II are anchored to the original foundation through multiple sets of U-shaped connectors.

[0019] S5. After inserting appropriate prestressed anchor bolts into the corresponding anchor bolt holes of the lower side plates of the upper and lower anchor plates, they are fixed by bolt fasteners to form an anchor bolt cage.

[0020] S6. Reinforcing mesh is laid at the outermost position of the original foundation, the position where the coupling steel component II connects to the lower side plate of the lower anchor plate, and the position where the coupling steel component I connects to the original foundation ring. The reinforcing mesh is made with openings at the positions of the coupling steel component I, the coupling steel component II, and the ring web to make the connection between the reinforcing mesh and the three parts above it more secure. When bearing load, it can be transferred to the entire foundation, so that the new foundation abutment, the new foundation extension, and the original foundation are connected as a whole.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The wind power foundation expansion method disclosed in this invention removes the concrete of the original foundation column, retains the original foundation ring, and installs a lower anchor plate on the outside of the original foundation ring. The lower anchor plate is fixedly connected to the original foundation ring by a coupling steel component I. A coupling steel component II is welded to the outer side of the lower anchor plate at the position corresponding to the coupling steel component I. The coupling steel components I and II are anchored to the original foundation concrete by multiple sets of U-shaped connectors, realizing the expansion of the foundation ring. It makes full use of the original components, expands the existing wind power foundation, saves raw materials, reduces construction costs, and shortens the construction period.

[0023] 2. The wind turbine foundation expansion method disclosed in this invention makes great use of the original foundation, only removing the original foundation support column. The support column is often the part of the original wind turbine foundation that is most severely damaged, ensuring that the new foundation will not be prematurely damaged due to fatigue damage of the original wind turbine foundation.

[0024] 3. The wind power foundation expansion project disclosed in this invention proposes a novel anchor-type foundation ring, with an innovative "I"-shaped cross-section design for the lower anchor plate. This "I"-shaped cross-section prevents upward deformation of the anchor plate due to excessive shear force in the anchor bolt area, while also providing a larger welding area for coupling steel components I and II, thus enhancing structural stability.

[0025] 4. The wind power foundation expansion project disclosed in this invention arranges studs on the original foundation ring to enhance the adhesion between the original foundation ring and the newly poured foundation column concrete, which to a certain extent prevents the concrete from cracking and being damaged, and further improves the service life of the new foundation column.

[0026] 5. The wind power foundation expansion project disclosed in this invention includes three rebar anchoring areas on the original foundation, improving the integrity of the new and old concrete. Through the overlapping of the steel mesh of the expanded foundation and the embedded rebar, the force is evenly transferred to the original foundation structure, making better use of the original foundation's bearing capacity.

[0027] 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

[0028] 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:

[0029] Figure 1 This is a structural schematic diagram of an in-situ expansion foundation for a wind power foundation according to the present invention;

[0030] Figure 2 For the present invention Figure 1 partial cross-section Figure 1 ;

[0031] Figure 3 For the present invention Figure 1 partial cross-section Figure 2 .

[0032] Figure reference numerals: 1. Original foundation ring, 101. Stud, 2. Original foundation, 3. Lower anchor plate, 31. Annular web, 32. Upper side plate, 33. Lower side plate, 34. Reinforcing bar, 4. Coupled steel component I, 5. Coupled steel component II, 6. U-shaped connector, 7. Prestressed anchor bolt, 8. Upper anchor plate, 9. Reinforcing mesh, 10. New foundation pedestal, 11. New foundation extension. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] like Figures 1-3 The diagram shows an on-site expansion foundation for a wind power foundation. This structure is an expansion of an existing wind power foundation. The original wind power foundation includes an original foundation column located at the center and an original foundation ring 1 embedded in the original foundation column. The expanded foundation structure includes an anchor bolt foundation ring fitted outside the original foundation ring. The anchor bolt foundation ring includes a lower anchor plate 3 with an "I"-shaped cross section, an upper anchor plate 8 used in conjunction with the lower anchor plate 3, and several prestressed anchor bolts 7 connecting the upper anchor plate 8 and the lower anchor plate 3.

[0037] The lower anchor plate 3 includes an annular web 31 and an upper side plate 32 and a lower side plate 33 welded to the upper and lower ends of the annular web 31, respectively. The upper side plate 32 is welded to the upper end of the annular web 31, and the lower side plate 33 is welded to the lower end of the annular web 31. The newly manufactured lower anchor plate 3 is connected to the original foundation ring using a coupling steel member I4. One end of the coupling steel member I4 is welded to the original foundation ring 1, and the other end is welded to the annular web 31 and the lower side plate 33 on the inner side of the lower anchor plate 3. A coupling steel member II5 is welded to the outer side of the lower anchor plate 3 at a position corresponding to the position where the coupling steel member I4 is welded to the inner side of the lower anchor plate 3. One end of the coupling steel member II5 is welded to the annular web 31 and the lower side plate 33 on the outer side of the lower anchor plate. The end of the coupling steel member I4 near the lower side plate 33 is stepped to facilitate welding to the lower side plate 33 on the inner side of the lower anchor plate 3. Multiple sets of U-shaped connectors 6 are evenly arranged along the length of coupling steel components I4 and II5, which are anchored to the original foundation 2 concrete through the U-shaped connectors 6. Both coupling steel components I4 and II5 are I-beams, and the U-shaped connectors 6 are U-shaped steel bars, with their free ends anchored in the original foundation 2 concrete.

[0038] Several layers of studs are arranged on the upper part of the original foundation ring to increase the adhesion between the original foundation ring and the newly poured concrete pedestal, thereby strengthening the overall structure.

[0039] To ensure a more stable connection between the newly constructed lower anchor plate 3 and the original foundation ring 1, and to improve the overall integrity of the new foundation, three rings of reinforcing bars 34 are wrapped around the annular web 31 of the lower anchor plate 3. The number of reinforcing bars 34 is not fixed and can vary depending on the actual construction conditions. After the new foundation is subjected to stress, the reinforcing bars 34 can transfer the force to the entire lower anchor plate 3, making the lower anchor plate 3 and the newly poured foundation more integrated.

[0040] An upper anchor plate 8 is installed on the new foundation column. Anchor bolt holes are opened at corresponding positions on the upper anchor plate 8 and the lower side plate 33. After inserting suitable prestressed anchor bolts 7 into the corresponding anchor bolt holes, they are fixed with bolts to form an anchor bolt cage. The upper anchor plate 8 is connected to the flange ring and then to the expanded wind turbine tower. That is, the flange ring has anchor bolt holes, and it is fixedly connected to the expanded wind turbine tower through these anchor bolt holes.

[0041] Reinforcing mesh 9 is evenly distributed at the outermost position of the original foundation 2, the position where the coupling steel component II5 connects to the lower side plate 33 of the lower anchor plate 3, and the position where the coupling steel component I4 connects to the original foundation ring 1. The reinforcing mesh 9 is made with openings at the positions of the coupling steel component I4, the coupling steel component II5, and the annular web 31, so that the connection between the reinforcing mesh and the three parts above it is more secure. When bearing the load, it can be transferred to the entire foundation, so that the new foundation column 10, the new foundation extension 11, and the original foundation 2 are connected as a whole.

[0042] The construction method for expanding the original foundation of this wind turbine includes the following steps:

[0043] S1. Retain the original foundation 2 and original foundation ring 1, and remove the original foundation columns;

[0044] S2. Arrange rebar installation areas in the remaining part of the original foundation 2, namely, the rebar installation areas are located on the outside of the extended part of the original foundation, the slope of the original foundation, and the part of the original foundation where the columns are removed.

[0045] S3. Install a lower anchor plate 3 outside the original foundation ring 1. The lower anchor plate 3 is fixedly connected to the original foundation ring 1 through a coupling steel component I4. That is, one end of the coupling steel component I4 is welded to the original foundation ring 1, and the other end is welded to the annular web plate 31 and the lower side plate 33 on the inner side of the lower anchor plate 3.

[0046] S4, the annular web 31 of the lower anchor plate 3 is wrapped with three rings of steel bars 34. The lower anchor plate 3 is welded to the position corresponding to the coupling steel member I4 on the outside of the lower anchor plate 3. The coupling steel member I4 and the coupling steel member II5 are anchored to the original foundation 2 through multiple sets of U-shaped connectors 6.

[0047] S5. After inserting suitable prestressed anchor bolts 7 into the anchor bolt holes corresponding to the lower side plate 33 of the upper anchor plate 8 and the lower anchor plate 3, they are fixed by bolt fasteners to form an anchor bolt cage.

[0048] S6, the outermost position of the original foundation 2, the position where the coupling steel component II5 connects to the lower side plate 33 of the lower anchor plate 3, and the position where the coupling steel component I4 connects to the original foundation ring 1, are reinforced with steel mesh 9. The steel mesh 9 is made with openings at the positions of the coupling steel component I4, the coupling steel component II5, and the annular web 31, so that the steel mesh is more firmly connected to the three parts above it, and can be transferred to the entire foundation when bearing load, so that the new foundation column 10, the new foundation extension part 11, and the original foundation 2 are connected as a whole.

[0049] 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 construction method for expanding the foundation of a wind power foundation on its original site, characterized in that, The original foundation expansion of the wind power foundation includes an anchor bolt foundation ring fitted outside the original foundation ring (1). The anchor bolt foundation ring includes a lower anchor plate (3) with an "I" shaped cross section, an upper anchor plate (8) used in conjunction with the lower anchor plate (3), and several prestressed anchor bolts (7) connecting the upper anchor plate (8) and the lower anchor plate (3). Several sets of coupling steel components I (4) are uniformly fixedly installed circumferentially on the lower anchor plate (3) connected to the original foundation ring. Coupling steel components II (5) are welded to the outer side of the lower anchor plate (3) at positions corresponding to coupling steel components I (4). Coupling steel components I (4) and coupling steel components II (5) are connected along the... Multiple sets of U-shaped connectors (6) with free ends anchored in the original foundation (2) are evenly arranged along the length direction. Reinforcing mesh (9) is evenly distributed at the outermost position of the original foundation (2), the position where the coupling steel component II (5) is connected to the lower anchor plate (3), and the position where the coupling steel component I (4) is connected to the original foundation ring (1). The lower anchor plate (3) includes an annular web (31) and an upper side plate (32) and a lower side plate (33) respectively welded to the upper and lower ends of the annular web (31). Several rings of reinforcing bars (34) are wrapped around the annular web (31) of the lower anchor plate (3). This construction method specifically includes the following steps: S1. Retain the original foundation (2) and the original foundation ring (1), and remove the original foundation column; S2. Arrange the rebar area in the remaining part of the original foundation (2), that is, the rebar area is on the outside of the extended part of the original foundation, the slope of the original foundation, and the part of the original foundation where the columns are removed. S3. Install a lower anchor plate (3) outside the original base ring (1). The lower anchor plate (3) and the original base ring (1) are fixedly connected by a coupling steel component I (4). That is, one end of the coupling steel component I (4) is welded to the original base ring (1), and the other end is welded to the annular web plate (31) and the lower side plate (33) on the inner side of the lower anchor plate (3). S4. The annular web (31) of the lower anchor plate (3) is wrapped with several rings of steel bars (34). The lower anchor plate (3) is welded to the position corresponding to the coupling steel member I (4) on the outside. The coupling steel member I (4) and the coupling steel member II (5) are anchored to the original foundation (2) through multiple sets of U-shaped connectors (6). S5. Anchor bolt holes are provided at corresponding positions of the upper anchor plate (8) and the lower side plate (33). After inserting prestressed anchor bolts (7) into the corresponding anchor bolt holes, they are fixed by bolt fasteners to form an anchor bolt cage. S6. Reinforcing mesh (9) is laid at the outermost position of the original foundation (2), the position where the coupling steel component II (5) is connected to the lower side plate (33) of the lower anchor plate (3), and the position where the coupling steel component I (4) is connected to the original foundation ring (1). The reinforcing mesh (9) is made with openings through the positions of the coupling steel component I (4), the coupling steel component II (5), and the annular web (31) so that the reinforcing mesh is more firmly connected to the three parts of the coupling steel component I (4), the coupling steel component II (5), and the annular web (31), and can be transferred to the entire foundation when bearing the load, so that the new foundation column (10), the new foundation extension part (11), and the original foundation (2) are connected as a whole.

2. The construction method for expanding the foundation of a wind power foundation on its original site as described in claim 1, characterized in that, One end of the coupling steel component II (5) is welded to the annular web (31) and the lower side plate (33) on the outer side of the lower anchor plate.

3. The construction method for expanding the foundation of a wind power foundation on its original site as described in claim 2, characterized in that, The coupling steel member I (4) and coupling steel member II (5) are stepped at the end near the lower side plate (33).

4. The construction method for expanding the foundation of a wind power foundation on its original site as described in claim 1, characterized in that, The coupling steel components I (4) and II (5) are both I-beams, and the U-shaped connector (6) is a U-shaped steel bar.

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