A method for expanding the capacity of a scalable prefabricated multi-legged foundation structure for wind power.

Abstract

This invention relates to an expandable prefabricated multi-legged foundation structure for wind power and its expansion method, belonging to the technical field of wind power foundation structures. The structure has two different forms: before and after expansion. The pre-expansion wind power foundation structure includes a column, multiple prefabricated ribs evenly connected to the inner side and perimeter of the column, and multiple prefabricated bearing platforms fixedly connected to the outer side of the prefabricated ribs. The post-expansion foundation structure includes expansion ribs inserted between adjacent prefabricated ribs, expansion bearing platforms installed at the outer ends of the expansion ribs, expansion columns vertically installed on the column, expansion anchor plates connected to the tower on the inner circumferential side of the expansion column, and connecting anchor bolts on the circumferential side of the cantilevered portion of the expansion column. The expansion ribs, expansion bearing platforms, and expansion columns are all prefabricated and assembled on the original wind power foundation structure, eliminating the need to dismantle the original wind power foundation structure. This simplifies expansion, and as a prefabricated structure, it has a short construction period, is easy to assemble and disassemble, and effectively ensures construction quality.

Description

Technical Field

[0001] This invention belongs to the field of wind power foundation technology, and particularly relates to an expandable wind power prefabricated multi-legged foundation structure and its expansion method. 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. Building wind farms on land faces challenges such as land scarcity and complex geological conditions. Furthermore, with the continuous development of wind turbine technology, the installed capacity of earlier wind turbines is relatively low, resulting in limited economic benefits. Most early wind farms possess good wind energy resources, and completely abandoning existing wind farms would be a huge waste of resources. Upgrading or expanding low-capacity, aging wind farms can effectively utilize resources. Moreover, wind turbines typically have a lifespan of 20-25 years, and foundations are usually designed for a 50-year lifespan. Therefore, expanding the capacity of onshore wind turbine foundations within their service life has been a common issue in recent years and will likely continue to be a focus of wind power development in the future.

[0004] Currently, when expanding the capacity of wind turbines, it is often necessary to increase the diameter of the wind turbine tower. After the diameter of the wind turbine tower is increased, the existing onshore wind power foundation cannot be easily and reliably connected to the tower. Usually, it is necessary to demolish the original foundation and rebuild it, or to chisel away the original foundation structure and carry out some expansion and reinforcement. This is complicated, time-consuming, causes great damage to the original foundation, cannot make full use of the original foundation, and cannot effectively guarantee the construction quality. Summary of the Invention

[0005] In view of this, in order to solve the problems of high expansion difficulty, inability to fully utilize the original foundation, long construction period and inability to guarantee construction quality when expanding the capacity of wind turbines in the prior art, the present invention provides an expandable prefabricated multi-legged wind power foundation structure and its expansion method, which fully considers the problem of later expansion from the initial foundation design stage.

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

[0007] An expandable wind power prefabricated multi-leg foundation structure has two different structural forms: before expansion and after expansion. The wind power foundation structure before expansion includes a column, multiple prefabricated ribs evenly connected to the inner side and the perimeter of the column, and multiple prefabricated bearing platforms fixedly connected to the outer side of the prefabricated ribs. The structure after expansion includes expansion ribs inserted between adjacent prefabricated ribs, expansion bearing platforms installed at the outer ends of the expansion ribs, expansion columns vertically installed on the column, expansion anchor plates connected to the tower are provided circumferentially on the inner side of the expansion column, and connecting anchor bolts are provided circumferentially on the cantilevered part of the expansion column.

[0008] The advantages of this basic scheme are as follows: the expansion ribs, expansion platform, and expansion column are all prefabricated in advance, and the expansion assembly is carried out directly on the original site of the original wind power foundation before expansion. There is no need to carry out complex demolition and reconstruction of the original wind power foundation structure, which makes expansion easy to achieve. Moreover, it is a prefabricated structure, with a short construction period, convenient disassembly and assembly, and can effectively ensure construction quality.

[0009] Furthermore, pre-embedded U-shaped reinforcement bars are pre-cast and overlapped at the joints between adjacent precast rib beams and expansion rib beams. After overlapping, the precast rib beams and adjacent expansion rib beams form post-cast joints. Beneficial effect: Ensures a stable connection between the expansion rib beams and precast rib beams.

[0010] Furthermore, the cantilevered portion of the expansion column is provided with anchor bolt holes circumferentially adapted to the connecting anchor bolts. Beneficial effect: Facilitates the anchor bolts being inserted into the anchor bolt holes, achieving a fixed connection between the expansion column and the corresponding precast rib beams and expansion rib beams.

[0011] Furthermore, the inner circumferential side of the expansion column is provided with a groove adapted to the expansion anchor plate. Beneficial effect: It facilitates the engagement of the expansion anchor plate within the groove, achieving the connection between the expansion anchor plate and the expansion column.

[0012] Furthermore, the expansion rib includes a foundation connection part II that is connected to the expansion foundation and is in the shape of a right-angled trapezoid, and a column connection part II that is connected to the expansion foundation column and has a hexagonal column-shaped end face.

[0013] Furthermore, the pier cap connection part II is placed overlapping with the expanded pier cap.

[0014] Furthermore, the precast rib beam includes a foundation connection part I that is connected to the precast foundation and is in the shape of a right-angled trapezoid, and a column connection part I that is connected to the original column end face in the shape of a hexagonal column.

[0015] Furthermore, the expansion column is vertically installed on column connection part I and column connection part II.

[0016] Furthermore, the length of the expanded rib beam is greater than that of the precast rib beam, and the area of ​​the expanded foundation is greater than that of the precast foundation.

[0017] A method for expanding the capacity of a scalable wind turbine prefabricated multi-legged foundation structure includes the following steps:

[0018] S1: Remove the original wind turbine foundation columns and the original post-cast joints, disassemble the original wind turbine foundation, that is, disassemble the original precast rib beams, place new expansion rib beams between adjacent precast rib beams, and then pour the new joints between the original precast rib beams and the expansion rib beams. The pre-embedded U-shaped bars between the precast rib beams and the expansion rib beams overlap each other to improve the connection strength between the precast rib beams and the expansion rib beams.

[0019] S2: The outer end of the expansion rib beam is connected to a new expansion bearing platform. The diameter of the circle formed by the expansion bearing platform is much larger than the diameter of the circle formed by the precast bearing platform. This allows the new wind power foundation to be buried at a greater depth, which can make full use of the weight of the soil cover to make the expansion rib beam and the end expansion bearing platform fit tightly together, eliminating the need for end connection and reducing construction steps.

[0020] S3: Prefabricate expansion columns according to the diameter requirements of the new wind turbine tower, install the expansion columns on the prefabricated ribs and expansion ribs, install expansion anchor plates in the circular grooves on the inner side of the expansion columns, insert appropriate connecting anchors into the anchor bolt holes on the circumference of the expansion columns to connect the expansion columns with the corresponding prefabricated ribs and expansion ribs, and insert appropriate connecting anchors into the anchor bolt holes of the expansion anchor plates to connect the expansion columns with the new wind turbine tower.

[0021] S4: Backfill the central cavity of the expansion column after installing the new wind turbine tower.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The expandable wind power prefabricated multi-legged foundation structure disclosed in this invention adopts prefabricated expansion ribs, expansion platforms, and expansion columns, and is directly assembled on the original site of the original wind power foundation before expansion. It does not require complex demolition and reconstruction of the original wind power foundation structure, making expansion easy to achieve. Moreover, as a prefabricated structure, the construction period is short, disassembly and assembly are convenient, and construction quality is guaranteed.

[0024] 2. The expandable prefabricated multi-leg foundation structure for wind power disclosed in this invention allows for the reuse of existing prefabricated ribs and prefabricated bearing platform components, saving resources and reducing material costs; at the same time, the connecting anchor bolts are easy to assemble and can be replaced after prestress loss or damage.

[0025] 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

[0026] 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:

[0027] Figure 1 This is a schematic diagram of the wind power foundation structure before capacity expansion in an embodiment of the present invention;

[0028] Figure 2 For the present invention Figure 1 A structural diagram showing the removal of the original connecting seams;

[0029] Figure 3 For the present invention Figure 1 A schematic diagram of the structure after assembling the expansion ribs and expansion foundation;

[0030] Figure 4 For the present invention Figure 3 A schematic diagram of the structure after post-cast splicing at the connection between the precast rib beam and the expansion rib beam;

[0031] Figure 5 For the present invention Figure 4 A schematic diagram of the structure after assembling the expansion column;

[0032] Figure 6 For the present invention Figure 5 A schematic diagram of the structure after the anchor bolts are assembled;

[0033] Figure 7 This is a schematic diagram of the structure at the connection between the prefabricated rib beam and the expansion rib beam of the present invention;

[0034] Figure 8 This is a schematic diagram of the expansion column in the expandable wind power prefabricated multi-legged foundation structure of the present invention.

[0035] Figure 9 This is a schematic diagram of the expansion anchor plate in the expandable wind power prefabricated multi-legged foundation structure of the present invention.

[0036] Figure 10 This is a schematic diagram of the expansion platform in the expandable wind power prefabricated multi-legged foundation structure of the present invention.

[0037] Figure 11 This is a schematic diagram of the expansion rib beam in the expandable wind power prefabricated multi-leg foundation structure of the present invention.

[0038] Figure reference numerals: 11. Precast rib beam, 12. Precast foundation, 13. Original post-cast joint, 21. Expanded rib beam, 22. Expanded foundation, 23. Post-cast joint, 24. Embedded U-shaped reinforcement, 25. Expanded column, 26. Expanded anchor plate, 27. Anchor bolt hole, 28. Connecting anchor bolt. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Example

[0043] An expandable wind power prefabricated multi-leg foundation structure has two different structural forms: before and after expansion.

[0044] like Figures 1-2 The diagram shows the original wind turbine foundation structure before expansion. The original foundation included columns, multiple precast ribs 11 evenly connected to the inner side and perimeter of the columns, and multiple precast bearing platforms 12 fixedly connected to the outer side of each rib 11. During the expansion of the existing wind turbine foundation, the diameter of the wind turbine tower needs to be adjusted. Therefore, the original columns cannot be reused; they must be chiseled open, and new expansion ribs 21 are inserted between adjacent precast ribs 11 to enlarge the original foundation. Concrete is then poured at the joint between the original precast ribs 11 and the expansion ribs 21.

[0045] like Figures 3 to 10The expanded wind turbine prefabricated multi-legged foundation structure shown includes an expansion rib beam 21 inserted between adjacent prefabricated rib beams 11. An expansion platform 22 is installed at the outer end of the expansion rib beam 21. The original prefabricated rib beam 11 includes a platform connection part I that is connected to the prefabricated platform 12 and is in the shape of a right-angled trapezoid, and a column connection part I that is in the shape of a hexagonal column connecting to the original column. The expansion rib beam 21 includes a platform connection part II that is connected to the expansion platform 22 and is in the shape of a right-angled trapezoid, and a column connection part II that is in the shape of a hexagonal column connecting to the expanded platform column. An expansion column 25 is vertically installed on the column connection part I and the column connection part II. An expansion anchor plate 26 is provided circumferentially on the inner side of the expansion column 25. The inner circumferential side of the expansion column 25 is provided with a circular groove that matches the expansion anchor plate 26, so that the expansion anchor plate 26 can be snapped into the groove. The tower and the expansion column 25 are connected through the expansion anchor plate 26. The cantilevered part of the expansion column 25 is provided with a connecting anchor bolt 28 that connects to the tower. The cantilevered part of the expansion column 25 is provided with an anchor bolt hole 27 that matches the connecting anchor bolt 28, so that the connecting anchor bolt 28 can be anchored into the anchor bolt hole 27, so as to realize the fixed connection between the expansion column 25 and the corresponding precast rib beam 11 and expansion rib beam 21. The connecting anchor bolt 28 is thin, uses less material, is easy to assemble, and facilitates the replacement operation of the wind turbine tower after prestress loss or damage. Precast embedded U-shaped bars are precast at the joints between adjacent precast rib beams 11 and expansion rib beams 21, and after overlapping, precast rib beams 11 and adjacent expansion rib beams 21 form post-cast joints 23. After pouring concrete into the post-cast joints 23, expansion rib beams 21 and precast rib beams 11 are stably connected.

[0046] The foundation connection part II overlaps with the expansion foundation 22. The length of the expansion rib beam 21 is greater than the length of the precast rib beam 11, and the area of ​​the expansion foundation 22 is greater than the area of ​​the precast foundation 12. If the original foundation depth is relatively large, the weight of the backfill soil can be fully utilized to make the outer end of the expansion rib beam 21 fit tightly with the expansion foundation 22, which can eliminate the need for end connection and reduce construction steps.

[0047] A method for expanding the capacity of a scalable wind turbine prefabricated multi-legged foundation structure includes the following steps:

[0048] S1: Remove the original wind power foundation columns, disassemble the original wind power foundation, remove and separate the original post-cast joint 13 between the original precast rib beams 11, place new expansion rib beams 21 between adjacent precast rib beams 11, and then pour the joint between the original precast rib beams 11 and expansion rib beams 21. The pre-embedded U-shaped bars between the precast rib beams 11 and expansion rib beams 21 overlap each other to improve the connection strength between the precast rib beams 11 and expansion rib beams 21.

[0049] S2: The outer end of the expansion rib beam 21 is connected to the new expansion bearing platform 22. The diameter of the circle formed by the expansion bearing platform 22 is much larger than the diameter of the circle formed by the precast bearing platform 12. In this way, the new wind power foundation is buried at a greater depth, which can make full use of the weight of the soil cover to make the expansion rib beam 21 and the end expansion bearing platform 22 fit tightly together, which can eliminate the end connection and reduce construction steps.

[0050] S3: Prefabricate expansion column 25 according to the diameter requirements of the new wind turbine tower, install expansion column 25 on prefabricated rib beam 11 and expansion rib beam 21, install expansion anchor plate 26 in the circular groove inside expansion column 25, insert appropriate connecting anchor bolt 28 into the anchor bolt hole 27 on the circumference of expansion column 25 to achieve connection between expansion column 25 and corresponding prefabricated rib beam 11 and expansion rib beam 21, and insert appropriate connecting anchor bolt 28 into the anchor bolt hole 27 of expansion anchor plate 26 to achieve connection between expansion column 25 and new wind turbine tower;

[0051] S4: Backfill the central cavity of the expansion column 25 after installing the new wind turbine tower.

[0052] 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 an expandable wind power prefabricated multi-legged foundation structure, characterized in that, This multi-legged foundation structure has two different structural forms: before and after expansion. The wind power foundation structure before expansion includes a column, multiple prefabricated ribs evenly connected to the inner side and the perimeter of the column, and multiple prefabricated bearing platforms fixedly connected to the outer side of the prefabricated ribs. The foundation structure after expansion includes expansion ribs inserted between adjacent prefabricated ribs, expansion bearing platforms installed at the outer ends of the expansion ribs, expansion columns vertically installed on the column, expansion anchor plates connected to the tower are provided circumferentially on the inner side of the expansion column, and connecting anchor bolts are provided circumferentially on the cantilevered portion of the expansion column. Prefabricated embedded U-shaped bars are prefabricated at the joints between adjacent prefabricated ribs and expansion ribs, and after overlapping, the prefabricated ribs and adjacent expansion ribs form post-cast joints. The expansion method includes the following steps: S1: Remove the original wind turbine foundation columns and the original post-cast joints, disassemble the original wind turbine foundation, that is, disassemble the original precast rib beams, place new expansion rib beams between adjacent precast rib beams, and then pour the new joints between the original precast rib beams and the expansion rib beams. The pre-embedded U-shaped bars between the precast rib beams and the expansion rib beams overlap each other to improve the connection strength between the precast rib beams and the expansion rib beams. S2: The outer end of the expansion rib beam is connected to a new expansion bearing platform. The diameter of the circle formed by the expansion bearing platform is much larger than the diameter of the circle formed by the precast bearing platform. This allows the new wind power foundation to be buried at a greater depth, which can make full use of the weight of the soil cover to make the expansion rib beam and the end expansion bearing platform fit tightly together, eliminating the need for end connection and reducing construction steps. S3: Prefabricate expansion columns according to the diameter requirements of the new wind turbine tower, install the expansion columns on the prefabricated ribs and expansion ribs, install expansion anchor plates in the circular grooves on the inner side of the expansion columns, insert appropriate connecting anchors into the anchor bolt holes on the circumference of the expansion columns to connect the expansion columns with the corresponding prefabricated ribs and expansion ribs, and insert appropriate connecting anchors into the anchor bolt holes of the expansion anchor plates to connect the expansion columns with the new wind turbine tower. S4: Backfill the central cavity of the expansion column after installing the new wind turbine tower.

2. The capacity expansion method as described in claim 1, characterized in that, The cantilevered portion of the expansion column is provided with anchor bolt holes in the circumference that are compatible with the connecting anchor bolts.

3. The capacity expansion method as described in claim 1, characterized in that, The inner circumferential side of the expansion platform is provided with a groove adapted to the expansion anchor plate.

4. The capacity expansion method as described in claim 1, characterized in that, The expansion rib includes a platform connection part II that is connected to the expansion platform and is in the shape of a right-angled trapezoid, and a column connection part II that is connected to the expansion platform column and has a hexagonal column-shaped end face.

5. The capacity expansion method as described in claim 4, characterized in that, The pier connection part II overlaps with the expanded pier.

6. The capacity expansion method as described in claim 4, characterized in that, The precast rib beam includes a foundation connection part I that is connected to the precast foundation and is in the shape of a right-angled trapezoid, and a column connection part I that is connected to the column end face in the shape of a hexagonal column.

7. The capacity expansion method as described in claim 6, characterized in that, The expansion column is vertically installed on column connection part I and column connection part II.

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