Land wind power foundation extended type modified beam plate type capacity expansion structure and construction method thereof

Abstract

The application discloses a land wind power foundation expansion type improved beam plate type capacity expansion structure and a construction method thereof, relates to the technical field of land wind power, and comprises an old foundation and a cast-in-place foundation arranged at the periphery of the old foundation. The cast-in-place foundation comprises a newly-poured bottom plate arranged at the bottom of the old foundation. A newly-poured beam assembly is arranged on the top surface of the newly-poured bottom plate. The newly-poured beam assembly is further connected with a newly-poured enclosure assembly. The newly-poured enclosure assembly is arranged at the upper periphery of the old foundation. The land wind power foundation expansion type improved beam plate type capacity expansion structure and the construction method thereof are adopted, a foundation beam plate is arranged, and an integral stress system is formed with the bottom plate, so that the bending stiffness, the torsional stiffness and the overall constraint capacity of the foundation are obviously improved, the load transmission is more reasonable, the stress is more uniform, and the overall working performance of the foundation is enhanced.

Description

Technical Field

[0001] This invention relates to the field of onshore wind power technology, and in particular to an extended beam-slab type expansion structure for onshore wind power foundations and its construction method. Background Technology

[0002] In existing technologies, traditional demolition and reconstruction methods and extended foundation development are commonly used when extending foundations, but these methods have the following drawbacks: Traditional demolition and reconstruction methods involve completely abandoning the old foundation and rebuilding a new foundation with larger dimensions and reinforcement on the original or new site. This method has significant drawbacks: First, it requires the use of heavy machinery to demolish, clear, and remove the old foundation, generating a large amount of construction waste, which is both environmentally unfriendly and costly. Second, the process of building a new foundation, from excavation and rebar tying to pouring and curing, is lengthy, resulting in excessive downtime for wind farms and significant losses in power generation. Finally, the value of the original foundation's concrete materials is completely wasted, leading to resource waste.

[0003] The extended foundation method requires a significant increase in the size of the base slab to improve overturning resistance, resulting in large amounts of concrete and steel reinforcement, high self-weight, and high cost. The base slab itself has limited stiffness, leading to insufficient overall rigidity, uneven load distribution, stress concentration, and uneven settlement. It is difficult to simultaneously meet the comprehensive requirements of strong overturning resistance, high overall stiffness, and economy. Another method involves embedding new steel reinforcement into the old structure without any connection between the old and new reinforcement. This prevents the old and new reinforcement from transferring forces and sharing loads, resulting in poor overall structural performance and fatigue resistance. Summary of the Invention

[0004] The purpose of this invention is to provide an extended beam-slab type expansion structure for onshore wind power foundations and its construction method, thereby solving the problems existing in the background art.

[0005] To achieve the above objectives, the present invention provides an onshore wind power foundation expansion structure by converting it into a beam-slab type, comprising an old foundation and a cast-in-place foundation disposed around the old foundation. The cast-in-place foundation includes a newly cast base slab disposed at the bottom of the old foundation. A newly cast beam assembly is disposed on the top surface of the newly cast base slab. The newly cast beam assembly is also connected to a newly cast retaining wall assembly, which is disposed on the upper periphery of the old foundation.

[0006] Preferably, the old foundation includes an old column and an old base plate disposed below the old column, wherein the bottom of the old base plate has an inwardly inclined edge; Both the old pillars and the old base plate are designed as polygonal structures.

[0007] Preferably, the new base plate is arranged around the old base plate, and the inner ring of the new base plate is provided with a bottom support groove, which is fitted and connected to the inclined edge.

[0008] Preferably, the bottom support groove is further provided with bottom plate connecting steel bars, which connect the old bottom plate and the newly poured bottom plate.

[0009] Preferably, the newly cast retaining wall assembly includes several column groups arranged around the old column, with an installation interval between two adjacent column groups, and each column group includes two connected newly cast columns.

[0010] Preferably, each of the newly cast columns is provided with a column connecting steel bar on its inner side, and the column connecting steel bar connects the newly cast column and the old column.

[0011] Preferably, the newly cast beam assembly includes a plurality of newly cast foundation beams, one end of which is disposed on the top surface of the newly cast base plate, and the other end of which is disposed within the installation interval.

[0012] Preferably, the bottom of the newly poured foundation beam is provided with a locking slot, which is engaged at the outer edge of the old base plate.

[0013] Preferably, a first beam reinforcement is provided on the front end face of the newly cast foundation beam, and the first beam reinforcement connects the newly cast foundation beam and the old pier column; The newly cast foundation beam is provided with second beam reinforcement on both sides of the end of the newly cast foundation beam located within the installation gap, and the second beam reinforcement connects the newly cast foundation beam and the newly cast pedestal column; The bottom of the newly cast foundation beam is provided with a third beam reinforcement and a fourth beam reinforcement. The third beam reinforcement connects the newly cast foundation beam to the old base plate, and the fourth beam reinforcement connects the newly cast foundation beam to the newly cast base plate.

[0014] A construction method for an extended beam-slab type expansion structure for onshore wind power foundations includes the following steps: S1. Excavation of the existing foundation: Part of the concrete at the edge of the old foundation slab is removed to form an inclined edge, exposing the old steel reinforcement of the old foundation slab. S2. Connection of old and new base slab reinforcement: Connect the old reinforcement of the old base slab with the base slab connection reinforcement of the newly poured base slab to form an integral reinforcement mesh; S3. Reinforcement setting for the old foundation slope: Insert the third beam reinforcement at the slope of the old foundation slab; S4. Reinforcement setting for newly cast pier columns: Reinforcing bars for connecting pier columns are set on the inner side of newly cast pier columns; S5. Reinforcement setting of foundation beam: The first beam reinforcement is set at the connection between the newly poured foundation beam and the old abutment column, the second beam reinforcement is set at the connection between the newly poured foundation beam and the newly poured abutment column, and the fourth beam reinforcement is set at the connection between the newly poured foundation beam and the newly poured base slab. S6. Integral Casting: After the reinforcing bars are inserted, the new columns, new base slabs and new foundation beams are cast integrally.

[0015] Therefore, the present invention, employing the aforementioned onshore wind power foundation expansion structure modified to beam-slab type and its construction method, has the following beneficial effects: (1) This structure significantly reduces the total investment in renovation, avoids the high costs of old foundation crushing and removal and the earthwork and support costs of full excavation of new foundation in traditional demolition schemes, and utilizes the residual value of the original foundation, saving major building materials such as concrete and steel.

[0016] (2) Compared with the traditional extended foundation beam-slab foundation structure, this structure can significantly reduce the amount of concrete and steel bars, reduce the self-weight of the foundation, optimize the material configuration, effectively reduce the project cost, and improve the economy, while ensuring the foundation bearing capacity.

[0017] (3) Traditional demolition and reconstruction schemes have long construction periods, while the construction process of this structure is simplified, eliminating the need to deal with construction waste and carry out large-scale earthwork operations. The process is closely linked, greatly reducing on-site operation time.

[0018] (4) This structure significantly improves the overturning resistance of the foundation. By increasing the contact area between the base plate and the foundation, it increases the overturning moment, reduces the overturning effect, and lowers the base stress and eccentricity. This effectively prevents the foundation from overturning, deflecting, and partially detaching under horizontal and eccentric loads, thereby improving the stability and safety of the foundation. It also greatly improves the overall stiffness and spatial integrity of the foundation.

[0019] (5) By setting up foundation beams and slabs and forming an integral force system with the bottom plate, this structure significantly improves the bending stiffness, torsional stiffness and overall constraint capacity of the foundation, making the load transfer more reasonable and the force more uniform, thus enhancing the overall working performance of the foundation.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Figure 2 This is a cross-sectional view of an extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Figure 3 This is a schematic diagram of the old foundation after the concrete has been removed, which is part of the extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Figure 4This is a schematic diagram of the old steel reinforcement exposed in the old foundation after the concrete has been removed from the existing onshore wind power foundation expansion and beam-slab type expansion structure of the present invention. Figure 5 This is a schematic diagram of the newly poured base plate of an extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Figure 6 This is a schematic diagram of the layout of the bottom plate connecting steel bars in the newly cast-in-place bottom plate of the expanded beam-slab type capacity expansion structure of an onshore wind power foundation according to the present invention. Figure 7 This is a schematic diagram of the newly cast retaining structure of a new onshore wind power foundation expansion-type beam-slab type expansion structure according to the present invention. Figure 8 This is a schematic diagram of the newly cast foundation beam of an extended beam-slab expansion structure for onshore wind power foundations according to the present invention. Figure 9 This is a diagram showing the reinforcement layout on the newly cast foundation beam of an extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Figure 10 This is a schematic diagram of the original foundation of an onshore wind power foundation expansion and beam-slab type expansion structure according to the present invention. Figure 11 This is a schematic diagram of the old foundation with exposed old steel bars after the concrete has been removed from the old foundation of the onshore wind power foundation expansion-beam-slab type expansion structure of the present invention. Figure 12 This is a schematic diagram of the reinforcement arrangement of an extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Figure 1 ; Figure 13 This is a schematic diagram of the reinforcement arrangement of an extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Figure 2 ; Figure 14 This is a schematic diagram of the reinforcement arrangement of an extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Figure 3 ; Figure 15 This is a schematic diagram of the overall arrangement of steel bars in an extended beam-slab expansion structure for onshore wind power foundations according to the present invention. Figure 16 This is a schematic diagram of the newly cast-in-place foundation of a new onshore wind power foundation expansion structure modified to beam-slab type according to the present invention; Figure 17 This is a flowchart illustrating a construction method for an extended beam-slab type expansion structure for onshore wind power foundations according to the present invention. Attached reference numerals: 1. Old foundation; 11. Old base slab; 12. Old pedestal; 13. Inclined edge; 14. Old reinforcing steel; 21. Newly poured base slab; 22. Support groove; 23. Base slab connecting reinforcing steel; 31. Newly poured foundation beam; 32. Interlock; 33. First beam reinforcing steel; 34. Second beam reinforcing steel; 35. Third beam reinforcing steel; 36. Fourth beam reinforcing steel; 41. Pedestal assembly; 42. Installation interval; 43. Newly poured pedestal; 44. Pedestal connecting reinforcing steel. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Example Please see Figures 1-17 It includes the old foundation 1 and the cast-in-place foundation set around the old foundation 1. The cast-in-place foundation includes a newly cast base slab 21 set at the bottom of the old foundation 1. A newly cast beam assembly is set on the top surface of the newly cast base slab 21. The newly cast beam assembly is also connected to the newly cast retaining wall assembly. The newly cast retaining wall assembly is set on the upper periphery of the old foundation 1.

[0025] The original old foundation 1 was a complete octagon. After removing a corner of the concrete from the outer edge of the old base slab 11, it was as follows: Figure 3 As shown, after the old foundation 1 was excavated, the old reinforcing steel bar 14 was exposed. Figure 4 As shown. The old foundation 1 includes an old pedestal 12 and an old base plate 11 located below the old pedestal 12. The bottom of the old base plate 11 has an inwardly inclined edge 13.

[0026] like Figure 5 As shown, the newly cast base plate 21 is arranged around the old base plate 11, and the inner ring of the newly cast base plate 21 has a bottom support groove 22. The bottom support groove 22 and the inclined edge 13 have the same size and are closely connected. Figure 6As shown, a bottom plate connecting steel bar 23 is also provided at the bottom support groove 22. The bottom plate connecting steel bar 23 connects the old bottom plate 11 and the newly poured bottom plate 21, enhancing the integrity of the old and new bottom plates 11.

[0027] like Figure 7 As shown, the newly cast-in-place retaining structure includes several column groups 41 arranged around the old column 12. An installation interval 42 is provided between adjacent column groups 41. Each column group 41 includes two connected newly cast columns 43. A column connecting steel bar 44 is provided on the inner side of each newly cast column 43, connecting the newly cast column 43 and the old column 12. The newly added column 43 structure effectively connects to the existing old column 12 and the newly cast foundation beam 31 as a whole. This enhances the load-bearing capacity and structural strength of the newly cast column 43, improves the overall integrity and collaborative performance of the connection between the new and old components, and ensures that the load borne by the newly cast column 43 can be reliably, continuously, and efficiently transferred to the cast-in-place foundation beam and the entire foundation system.

[0028] like Figure 8 As shown, the newly cast foundation beam assembly includes several newly cast foundation beams 31. One end of each newly cast foundation beam 31 is positioned on the top surface of the newly cast base slab 21, and the other end is positioned within the installation interval 42. A locking slot 32 is provided at the bottom of each newly cast foundation beam 31, which is engaged with the outer edge of the old base slab 11. The newly cast foundation beams 31 are reliably connected to the newly cast columns 43, the slope of the old foundation 1, and the newly cast base slab 21, respectively. This effectively transfers the load transmitted by the newly cast columns 43 to the old foundation 1 and the newly cast base slab 21, thus comprehensively improving the overall connection and collaborative performance between the old and new foundations 1, achieving efficient load transfer and reasonable distribution, and significantly enhancing the overall rigidity and overturning resistance of the foundation.

[0029] Compared to traditional foundation beams, the newly cast foundation beam 31 adopts an irregular structural design. Its outline can precisely fit the slope structure characteristics of the existing old foundation 1, realizing the coordinated transmission of internal forces of the old foundation 1 through the old column 12, slope and old base plate 11. At the same time, the irregular foundation beam is equipped with a through-type foundation beam-new cast column 43-old column 12 integral connection steel reinforcement system, which promotes the three major load-bearing components to form an organic whole that coordinates the load, ensuring a more scientific and smooth force transmission path. In addition, a reliable steel reinforcement connection structure is also set between the newly cast foundation beam 31 and the existing slope and newly cast base plate 21, ultimately realizing the effective combination and overall coordinated work of the new and old foundations 1.

[0030] like Figure 9As shown, a first beam reinforcement 33 is provided on the front end face of the newly cast foundation beam 31. The first beam reinforcement 33 connects the newly cast foundation beam 31 and the old pedestal column 12, enhancing the integrity of the new and old foundations 1 and allowing the upper load to be transferred through the foundation beam. Second beam reinforcement 34 is provided on both sides of the end of the newly cast foundation beam 31 within the installation gap, connecting the newly cast foundation beam 31 and the newly cast pedestal column 43. A third beam reinforcement 35 and a fourth beam reinforcement 36 are provided at the bottom of the newly cast foundation beam 31. The third beam reinforcement 35 connects the newly cast foundation beam 31 to the slope of the old base slab 11, enhancing the integrity of the foundation beam and the old foundation 1; the fourth beam reinforcement 36 connects the newly cast foundation beam 31 to the newly cast base slab 21, enhancing pull-out resistance.

[0031] like Figure 17 As shown, a construction method for an extended beam-slab type expansion structure for onshore wind power foundations includes the following steps: S1. Excavation of the existing foundation 1: such as Figure 10 As shown, part of the concrete at the edge of the old base plate 11 is chiseled away to form an inclined edge 13, exposing the old steel bars 14 of the old base plate 11.

[0032] S2, Connection of steel bars 11 between old and new base slabs: (e.g.) Figure 11 As shown, the old steel bars 14 of the old base slab 11 and the base slab connecting steel bars 23 of the newly poured base slab 21 are connected together to form an integral steel mesh.

[0033] S3, Reinforcement installation for the slope of the old foundation 1: (e.g.) Figure 12 As shown, the third beam reinforcement 35 is inserted at the slope of the old base plate 11.

[0034] S4. Reinforcement setting for newly poured pier columns: (e.g., ...) Figure 13 As shown, a column connecting steel bar 44 is provided on the inner side of the newly cast column 43.

[0035] S5. Reinforcement arrangement for foundation beams: (e.g.) Figure 14 As shown, a first beam reinforcement 33 is provided at the connection between the newly cast foundation beam 31 and the old pedestal column 12, a second beam reinforcement 34 is provided at the connection between the newly cast foundation beam 31 and the newly cast pedestal column 43, and a third beam reinforcement 35 is provided at the connection between the newly cast foundation beam 31 and the newly cast base slab 21.

[0036] S6. Integral casting: such as Figure 15 As shown, after the reinforcing bars are inserted, the new column 43, the new base slab 21, and the new foundation beam 31 are integrally cast. The integrally cast part is as follows: Figure 16 As shown.

[0037] Therefore, the present invention adopts the above-mentioned onshore wind power foundation expansion-to-beam-slab type expansion structure and its construction method. By implementing the base plate extension, column diameter increase and foundation form optimization of the existing expansion foundation, the overturning resistance and bearing capacity of the foundation can be significantly improved. It not only saves the cost of old foundation demolition and material transfer, but also makes full use of the original foundation resources, so that the new foundation can meet the operation support requirements of larger capacity wind turbines with minimal modification. At the same time, the beam-slab type foundation has better economy and more clear and reasonable stress characteristics than the traditional expansion foundation.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. 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 still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A type of onshore wind power foundation expansion structure modified from beam-slab type, characterized in that: It includes an old foundation and a cast-in-place foundation located around the old foundation. The cast-in-place foundation includes a newly cast base slab located at the bottom of the old foundation. A newly cast beam assembly is provided on the top surface of the newly cast base slab. The newly cast beam assembly is also connected to a newly cast retaining wall assembly, which is located on the upper periphery of the old foundation.

2. The onshore wind power foundation expansion structure modified to beam-slab type according to claim 1, characterized in that: The old foundation includes old columns and an old base plate located below the old columns, with an inwardly inclined edge at the bottom of the old base plate; Both the old pillars and the old base plate are designed as polygonal structures.

3. The onshore wind power foundation expansion-type beam-slab type expansion structure according to claim 2, characterized in that: The newly poured base plate is arranged around the old base plate, and the inner circle of the newly poured base plate is provided with a bottom support groove, which is fitted and connected to the inclined edge.

4. The onshore wind power foundation expansion-type beam-slab type expansion structure according to claim 3, characterized in that: The bottom support groove is also provided with bottom plate connecting steel bars, which connect the old bottom plate and the newly poured bottom plate.

5. The onshore wind power foundation expansion-type beam-slab type expansion structure according to claim 4, characterized in that: The newly cast retaining wall assembly includes several column groups arranged around the old column bases, with an installation interval between adjacent column groups, and each column group includes two connected newly cast columns.

6. The onshore wind power foundation expansion-type beam-slab type expansion structure according to claim 5, characterized in that: Each of the newly cast columns is provided with a column connecting steel bar on its inner side, which connects the newly cast column and the old column.

7. The onshore wind power foundation expansion-type beam-slab type expansion structure according to claim 6, characterized in that: The newly cast beam assembly includes several newly cast foundation beams, one end of which is located on the top surface of the newly cast base plate, and the other end of which is located within the installation interval.

8. The onshore wind power foundation expansion-type beam-slab type expansion structure according to claim 7, characterized in that: The bottom of the newly poured foundation beam is provided with a locking slot, which is engaged at the outer edge of the old base plate.

9. The onshore wind power foundation expansion-type beam-slab type expansion structure according to claim 8, characterized in that: The front end face of the newly cast foundation beam is provided with a first beam reinforcement, which connects the newly cast foundation beam and the old pier column. The newly cast foundation beam is provided with second beam reinforcement on both sides of the end of the newly cast foundation beam located within the installation gap, and the second beam reinforcement connects the newly cast foundation beam and the newly cast pedestal column; The bottom of the newly cast foundation beam is provided with a third beam reinforcement and a fourth beam reinforcement. The third beam reinforcement connects the newly cast foundation beam to the old base plate, and the fourth beam reinforcement connects the newly cast foundation beam to the newly cast base plate.

10. A construction method for an extended beam-slab type expansion structure for onshore wind power foundations according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Excavation of the existing foundation: Part of the concrete at the edge of the old foundation slab is removed to form an inclined edge, exposing the old steel reinforcement of the old foundation slab. S2. Connection of old and new base slab reinforcement: Connect the old reinforcement of the old base slab with the base slab connection reinforcement of the newly poured base slab to form an integral reinforcement mesh; S3. Reinforcement setting for the old foundation slope: Insert the third beam reinforcement at the slope of the old foundation slab; S4. Reinforcement setting for newly cast pier columns: Reinforcing bars for connecting pier columns are set on the inner side of newly cast pier columns; S5. Reinforcement setting of foundation beam: The first beam reinforcement is set at the connection between the newly poured foundation beam and the old abutment column, the second beam reinforcement is set at the connection between the newly poured foundation beam and the newly poured abutment column, and the fourth beam reinforcement is set at the connection between the newly poured foundation beam and the newly poured base slab. S6. Integral Casting: After the reinforcing bars are inserted, the new columns, new base slabs and new foundation beams are cast integrally.

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