A scalable wind power assembly type square beam slab foundation structure and a method for expanding capacity thereof

Abstract

The application relates to a scalable wind power assembly type square beam slab foundation structure and a scalable method thereof. The assembly type beam slab foundation before expansion comprises original support columns located at the center, prefabricated rib beams assembled and connected with the four sides of the original support columns, bevel rib beams assembled and connected with the four corners of the original support columns, and prefabricated bottom plates assembled and connected with the prefabricated rib beams and the bevel rib beams below; the structure after expansion comprises expansion support columns installed after the original support columns are removed, reinforcing rib beams assembled on the two sides of the prefabricated rib beams, expansion rib beams connected with the reinforcing rib beams and the outer ends of the prefabricated rib beams, expansion bevel rib beams connected with the outer ends of the bevel rib beams, expansion bottom plates I assembled and distributed on the two sides of the expansion rib beams and expansion bottom plates II assembled and distributed on the two sides of the expansion bevel rib beams with the prefabricated bottom plates, most of which are prefabricated and spliced to reduce the construction period, most of the components can be continuously used after the existing assembly type beam slab foundation is removed, the existing materials are fully utilized, and the construction cost is reduced.

Description

An expandable prefabricated square beam-slab foundation structure for wind power and its expansion method Technical Field

[0001] This invention belongs to the field of wind power foundation structure technology, and relates to an expandable wind power prefabricated square beam-slab 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] Conventional cast-in-place foundations for wind farms require complex foundation expansion plans, on-site expansion work, or complete demolition of existing foundations when faced with upgrades and expansions. This involves a large workload and cumbersome procedures. Some foundations that are difficult to demolish are left in place, failing to make good use of the original foundations and resulting in resource waste. If the subsequent expansion methods are designed in detail from the initial foundation design stage, it can facilitate later foundation expansion work, significantly shorten the construction cycle, reduce material waste, and promote the high-quality and sustainable development of the wind power industry.

[0005] Therefore, given the complexity of foundation expansion procedures and the lack of mature and standardized expansion schemes when facing wind farm expansion using existing foundation forms, it is essential to propose a structural form that facilitates later expansion. Thus, there is an urgent need to develop an expandable foundation structure and its supporting expansion construction methods. Summary of the Invention

[0006] In view of this, in order to solve the problems of cumbersome expansion and renovation of wind turbine foundations within their service life, failure to fully utilize the original foundation, and waste of materials, this invention proposes an expandable wind power prefabricated square beam-slab foundation structure and its expansion method. This method enables the expansion and reinforcement of the original wind farm on the original site, which can make full and effective use of the original foundation, effectively shorten the construction period of wind farm expansion and reduce construction costs, thereby accelerating the construction of wind farm expansion and improving economic efficiency. The later expansion problem is considered from the initial design of the foundation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An expandable wind turbine prefabricated square beam-slab foundation structure has two different structural forms: before and after expansion. The prefabricated beam-slab foundation before expansion includes the original abutment at the center, prefabricated rib beams assembled and connected to the original abutment on all four sides, diagonal rib beams assembled and connected to the four corners of the original abutment, and a prefabricated base plate located below and assembled with the prefabricated rib beams and diagonal rib beams. The prefabricated beam-slab foundation structure after expansion includes an expansion abutment installed after removing the original abutment, and a prefabricated base plate assembled on the prefabricated... The reinforcing ribs on both sides of the rib beam, the expansion ribs connected to the outer ends of the reinforcing ribs and precast ribs, the expansion oblique ribs connected to the outer ends of the oblique ribs, the expansion base plate I assembled with the precast base plate and distributed on both sides of the expansion ribs, and the expansion base plate II assembled with the precast base plate and distributed on both sides of the expansion oblique ribs, are all fixedly connected to the expansion platform column by prestressed steel cables inserted therein after the assembly of the reinforcing ribs and precast ribs with the expansion ribs, and the expansion oblique ribs with the oblique ribs.

[0009] Furthermore, the prefabricated beam-slab foundation before expansion was a square structure, with prestressed steel cables inserted into the precast ribs and inclined ribs; the foundation structure after expansion was equipped with expansion sealing edges that were connected end to end.

[0010] Furthermore, slots I for splicing with precast rib beams are provided on the four sides of the expansion column. Multiple rows of parallel insertion holes I for splicing with prestressed steel cables are provided in slots I and on the expansion column on both sides. Among them, three insertion holes I are arranged vertically in slots I, and four parallel insertion holes I are provided on the expansion column.

[0011] Furthermore, the four corners of the expansion column are flat and have slots II for splicing with the inclined rib beams. There are three insertion holes II arranged vertically in the slots II.

[0012] Furthermore, slots are provided at the bottom of the precast ribs, and insert plates are provided at the bottom of the reinforcing ribs to connect with the slots. Beneficial effect: The insert plates are inserted into the slots, enabling the precast ribs and reinforcing ribs to be positioned and securely connected.

[0013] Furthermore, the prestressed steel cable is inserted into socket I after passing through the expansion rib, the reinforcement rib, and the precast rib. The prestressed steel cable is then inserted into socket II after passing through the expansion inclined rib and the inclined rib in sequence.

[0014] Furthermore, the precast base plate and reinforcing ribs, the expanded base plate I and the expanded ribs, and the expanded base plate II and the expanded inclined ribs are all spliced ​​together.

[0015] Furthermore, the expansion sealing edge is provided with through holes adapted to the prestressed steel cable.

[0016] Furthermore, an expansion anchor plate is provided circumferentially on the inner side of the expansion column.

[0017] An expansion method for an expandable wind turbine prefabricated square beam-slab foundation structure includes the following steps:

[0018] S1: Remove the original columns, prestressed steel cables and precast base slabs, leaving the precast base slabs for future use;

[0019] S2: As per design requirements, prefabricate expansion columns, reinforcing ribs, expansion ribs, expansion inclined ribs, expansion base plate I, expansion base plate II, prestressed steel cables and expansion anchor plates. Prefabricate slot I, insertion hole I, slot II and insertion hole II on the expansion columns. Open slots at the bottom of the prefabricated ribs to splice with the reinforcing ribs.

[0020] S3: Install expansion columns at the original column positions, splice reinforcement ribs on both sides of the precast rib beams, splice the spliced ​​reinforcement ribs and precast ribs with expansion ribs, and splice the expansion inclined ribs with inclined ribs, and then splice the precast base plate, expansion base plate I and expansion base plate II in sequence.

[0021] S4: Connect the expansion and sealing edges on the outer perimeter;

[0022] S5: The prestressed steel cable is inserted throughout the entire length and then tensioned and fixed.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The expandable wind power prefabricated square beam-slab foundation structure disclosed in this invention enhances the load-bearing capacity of the foundation structure at the intersection of the column and the rib beam by installing new expansion columns and splicing reinforced rib beams.

[0025] 2. The expandable wind power prefabricated square beam-slab foundation structure disclosed in this invention allows most components to be reused after the prefabricated beam-slab foundation before expansion is dismantled, making full use of existing materials, saving materials, and reducing construction costs.

[0026] 3. The expandable wind power prefabricated square beam-slab foundation structure disclosed in this invention uses prefabrication and splicing construction for most of the expansion components, which is convenient to operate and reduces the construction cycle. At the same time, it is easy to disassemble during later maintenance, which reduces maintenance costs.

[0027] 4. The expandable wind power prefabricated square beam-slab foundation structure disclosed in this invention improves the integrity and stability of the structure through expansion ribs, expansion inclined ribs, and expansion sealing.

[0028] 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

[0029] 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:

[0030] Figure 1 is a structural schematic diagram of the prefabricated beam-slab foundation before expansion;

[0031] Figure 2 is a schematic diagram of the prefabricated beam-slab foundation after the original columns were removed before the expansion.

[0032] Figure 3 is a schematic diagram of the expansion column in the expandable prefabricated beam-slab foundation structure of the present invention.

[0033] Figure 4 is a schematic diagram of the structure after the expansion column is assembled with the original prefabricated rib beam and the inclined rib beam in this invention.

[0034] Figure 5 is a schematic diagram of the structure after the prestressed steel cable is inserted and reinforced with rib beams and precast rib beams in this invention.

[0035] Figure 6 is a structural schematic diagram of the expandable prefabricated beam-slab foundation structure of the present invention.

[0036] Figure 7 is a schematic diagram of the expandable prefabricated beam-slab foundation structure of the present invention.

[0037] Figure 8 is an exploded view of part of the structure in Figure 7.

[0038] Figure reference numerals: 11. Hydraulic rib beam; 12. Precast rib beam; 13. Slot; 14. Precast base plate; 15. Original edge seal; 16. Prestressed steel cable; 20. Original pedestal; 21. Expanded pedestal; 22. Expanded anchor plate; 23. Prestressed steel cable; 24. Reinforcing rib beam; 25. Expanded rib beam; 26. Expanded hypotenuse rib beam; 31. Expanded base plate I; 32. Expanded base plate II; 33. Expanded edge seal. 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 square beam-slab foundation structure has two different structural forms: before expansion and after expansion.

[0044] Figures 1 and 2 show the prefabricated beam-slab foundation before expansion, including the original column 20 at the center, prefabricated rib beams 12 spliced ​​and assembled with the original column 20 on all four sides, oblique rib beams 11 spliced ​​and assembled with the original column 20 at the four corners, and a prefabricated base plate 14 spliced ​​and assembled with the prefabricated rib beams 12 and oblique rib beams 11 below them. The outer perimeter of the structure is formed by the original sealing edge 15 connected end to end. Prestressed steel cables 16 are inserted into the prefabricated rib beams 12 and oblique rib beams 11. After decades of operation, the previously built wind turbine generators have limited economic benefits due to their low installed capacity, which cannot meet market demand. It is necessary to replace them with large-capacity wind turbine generators. Expanding and reinforcing the original foundation to improve the load-bearing capacity is essential.

[0045] Therefore, a prefabricated beam-slab foundation structure is provided, as shown in Figures 3-8, which expands the existing foundation before expansion. This structure includes an expansion column 21 installed after removing the original column 20; reinforcing ribs 24 spliced ​​and assembled on both sides of the precast rib beam 12; expansion ribs 25 connected to the reinforcing ribs 24 and the outer ends of the precast ribs 12; expansion inclined ribs 26 connected to the outer ends of the inclined ribs 11; expansion base plates I 31 spliced ​​and assembled with the precast base plate 14 and distributed on both sides of the expansion ribs 25; and expansion base plates II 32 assembled with the precast base plate 14 and distributed on both sides of the expansion inclined ribs 26. The bottom of the precast ribs 12 has an opening... The bottom of the reinforcing rib 24 is provided with a plate that is spliced ​​with the slot 13. The plate is inserted into the slot 13 to achieve a firm connection between the precast rib 12 and the reinforcing rib 24. The precast base plate 14 is spliced ​​with the reinforcing rib 24, the expansion base plate I 31 is spliced ​​with the expansion rib 25, and the expansion base plate II 32 is spliced ​​with the expansion oblique rib 26. The bottom of both sides of the assembled reinforcing rib 24 and the bottom of both sides of the oblique rib 11 are spliced ​​with the precast base plate 14. In this embodiment, the expansion base plate I 31 is rectangular and the expansion base plate II 32 is triangular. In actual construction, the expansion base plate I 31 and the expansion base plate II 32 can be other shapes according to the site requirements.

[0046] The assembled reinforcing ribs 24 and precast ribs 12 are fixedly connected to the expansion ribs 25, expansion inclined ribs 26, and inclined ribs 11 via prestressed steel cables 23 inserted therein, and to the expansion platform 21. The expansion platform 21 has slots I on its four sides for splicing with the precast ribs 12. Multiple rows of parallel insertion holes I for splicing with the prestressed steel cables 23 are equally spaced within the slots I and on the expansion platform 21 on both sides. The slots I have three vertically arranged insertion holes I, and the expansion platform 21 has two rows of parallel insertion holes I. The expansion column 21 has four corresponding insertion holes I at the top and bottom. The four corners of the expansion column 21 are flat and have slots II for splicing with the inclined rib beam 11. There are three insertion holes II arranged vertically in the slots II. The insertion holes I and II are the same size and are adapted to the prestressed steel cable 23. The prestressed steel cable 23 is inserted into the insertion hole I after passing through the expansion rib beam 25, the reinforcing rib beam 24 and the precast rib beam 12. The prestressed steel cable 23 is inserted into the insertion hole II in sequence through the expansion inclined rib beam 26 and the inclined rib beam 11 to achieve the connection with the expansion column 21.

[0047] The structure is externally fitted with interconnected expansion sealing edges 33, each comprising a curved end and a vertical rod. The ends and rods of the four expansion sealing edges 33 are spliced ​​together to achieve the integrity of the structure. Both the ends and rods have through holes adapted to accommodate prestressed steel cables 23, which pass through these holes. The ends and rods are respectively spliced ​​to expansion base plate II 32 and expansion base plate I 31.

[0048] An expansion anchor plate 22 is provided on the inner circumferential side of the expansion column 21. The expansion anchor plate 22 is fixedly connected to the newly built tower by bolts.

[0049] An expandable prefabricated beam-slab foundation structure expansion method includes the following steps:

[0050] S1: Remove the original 20 columns, 15 edge banding, 16 prestressed steel cables and 14 precast base plates. Keep the precast base plate 14 for future use.

[0051] S2: As per design requirements, prefabricate expansion column 21, reinforcing rib beam 24, expansion rib beam 25, expansion inclined rib beam 26, expansion base plate I 31, expansion base plate II 32, prestressed steel cable 23 and expansion anchor plate 22. Prefabricate slot I, insertion hole I, slot II and insertion hole II on expansion column 21. Open slot 13 at the bottom of prefabricated rib beam 12 to splice with reinforcing rib beam 24.

[0052] S3: Install expansion column 21 at the original column 20 position, and splice reinforcement rib beam 24 on both sides of precast rib beam 12. The spliced ​​reinforcement rib beam 24 and precast rib beam 12 are spliced ​​with expansion rib beam 25, expansion oblique rib beam 26 and oblique rib beam 11, and then splice precast base plate 14, expansion base plate I 31 and expansion base plate II 32 in sequence.

[0053] S4: Connect the expansion and sealing edges 33 end to end on the outer perimeter.

[0054] S5: After the prestressed steel cable 23 is inserted through the entire length, the corresponding rib beam is tensioned and fixed.

[0055] 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. An expandable wind turbine square prefabricated beam-slab foundation structure, comprising two different structural forms: pre-expansion and post-expansion. The pre-expansion prefabricated beam-slab foundation includes an original abutment located at the center, prefabricated rib beams assembled and connected to the four sides of the original abutment, diagonal rib beams assembled and connected to the four corners of the original abutment, and a prefabricated base plate located below and assembled and connected to the prefabricated rib beams and diagonal rib beams. The post-expansion prefabricated beam-slab foundation includes an expanded abutment installed after removing the original abutment, and a prefabricated base plate assembled and connected to the prefabricated base plate. The reinforcing ribs on both sides of the precast ribs, the expansion ribs connected to the outer ends of the reinforcing ribs and the precast ribs, the expansion oblique ribs connected to the outer ends of the oblique ribs, the expansion base plate I which is assembled with the precast base plate and distributed on both sides of the expansion ribs, and the expansion base plate II which is assembled with the precast base plate and distributed on both sides of the expansion oblique ribs, are all fixedly connected to the expansion platform column by prestressed steel cables inserted therein after assembly of the reinforcing ribs and the precast ribs with the expansion ribs, and the expansion oblique ribs with the oblique ribs.

2. The expandable wind power square prefabricated beam-slab foundation structure as described in claim 1, characterized in that, The prefabricated beam-slab foundation before expansion is a square structure, with prestressed steel cables inserted into the precast rib beams and inclined rib beams; the outer perimeter of the tower expansion foundation structure is equipped with expansion sealing edges that are connected end to end.

3. The expandable wind power square prefabricated beam-slab foundation structure as described in claim 2, characterized in that, The expansion column has slots I on its four sides for splicing with precast rib beams. Multiple rows of parallel insertion holes I for splicing with prestressed steel cables are equally spaced in the slots I and on the expansion column on both sides. The slots I have three vertically arranged insertion holes I, and the expansion column has two rows of four parallel vertically corresponding insertion holes I.

4. The expandable wind power square prefabricated beam-slab foundation structure as described in claim 3, characterized in that, The expansion column has a flat surface at its four corners and is provided with slots II for splicing with the inclined rib beams. There are three insertion holes II arranged vertically in the slots II.

5. The expandable wind power square prefabricated beam-slab foundation structure as described in claim 4, characterized in that, The precast rib beam has a slot at its bottom, and the reinforcing rib beam has an insert plate at its bottom that connects with the slot.

6. The expandable wind power square prefabricated beam-slab foundation structure as described in claim 5, characterized in that, The prestressed steel cable is inserted into the insertion hole I after passing through the expansion rib, the reinforcement rib and the precast rib. The prestressed steel cable is then inserted into the insertion hole II in sequence through the expansion inclined rib and the inclined rib.

7. The expandable wind power square prefabricated beam-slab foundation structure as described in claim 6, characterized in that, The precast base plate and reinforcing ribs, the expanded base plate I and the expanded ribs, and the expanded base plate II and the expanded inclined ribs are all spliced ​​together.

8. The expandable wind power square prefabricated beam-slab foundation structure as described in claim 7, characterized in that, The expansion sealing edge is provided with through holes adapted to the prestressed steel cable.

9. The expandable wind power square prefabricated beam-slab foundation structure as described in claim 8, characterized in that, An expansion anchor plate is provided on the inner circumferential side of the expansion platform.

10. The expansion method for an expandable wind power square prefabricated beam-slab foundation structure as described in claim 9, characterized in that, Includes the following steps: S1: Remove the original columns, prestressed steel cables and precast base slabs, leaving the precast base slabs for future use; S2: As per design requirements, prefabricate the expansion column, reinforcing ribs, expansion ribs, expansion inclined ribs, expansion base plate I, expansion base plate II, prestressed steel cables, and expansion anchor plates. Prefabricate slot I, insertion hole I, slot II, and insertion hole II on the expansion column. Open slots at the bottom of the prefabricated ribs to splice with the reinforcing ribs. S3: Install the expansion column at the original column position. Splice the reinforcing ribs on both sides of the prefabricated ribs. After splicing, the reinforcing ribs and prefabricated ribs are spliced ​​with the expansion ribs, and the expansion inclined ribs are spliced ​​with the inclined ribs. Then, splice the prefabricated base plate, expansion base plate I, and expansion base plate II in sequence. S4: Connect the expansion edge end to end on the outer perimeter. S5: Tension and fix the prestressed steel cables after inserting them along the entire length.

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