A land wind power bolt expansion and extension type foundation and a construction method thereof

Abstract

This invention discloses an extended foundation for onshore wind power with rebar anchoring and its construction method, belonging to the field of wind power foundation expansion construction. The rebar anchoring expansion method includes the following steps: removing part of the concrete at the edge of the old foundation slab and exposing the rebar of the old foundation slab; welding the rebar of the old foundation slab and the rebar of the new foundation slab together to form an integral rebar mesh; inserting rebar into the side of the slab; creating a rebar anchoring groove at the location where rebar needs to be inserted on the slope of the old foundation; placing spiral rebar and embedded rebar in the rebar anchoring groove on the slope of the old foundation, and then pouring concrete into the rebar anchoring groove; inserting rebar into the side of the support column; setting up formwork outside the old foundation and pouring new concrete, finally forming a complete expanded foundation. This invention can solve the problems of high cost of demolishing the original foundation during the wind turbine upgrade process of onshore wind power, as well as the increased construction period, the generation of a large amount of construction waste, and the significant disturbance to on-site safety and the surrounding environment.

Description

Technical Field

[0001] This invention relates to the field of wind power foundation expansion construction technology, and in particular to an onshore wind power rebar expansion foundation and its construction method. Background Technology

[0002] Onshore wind power generates electricity through wind turbines. Upgrading wind turbines requires demolishing the existing foundations. Traditional demolition and reconstruction methods have the following problems: 1. Economic efficiency: Demolition and reconstruction methods are costly, consuming all new materials and incurring huge demolition, removal and disposal costs; 2. Construction period: The demolition and reconstruction method involves a large amount of on-site pouring work due to demolition, transportation, and foundation reconstruction, which makes the construction period longer; 3. Environmental issues: Demolition and reconstruction methods generate a large amount of non-recyclable construction waste, which violates the concept of green and sustainable development; 4. Construction risks: Demolition and reconstruction involves large-scale earthwork excavation and heavy machinery operations, which poses a greater disturbance to on-site safety and the surrounding environment. Summary of the Invention

[0003] The purpose of this invention is to provide an extended foundation for onshore wind power with rebar anchoring and its construction method, which solves the problems of high costs for old foundation crushing and removal, and earthwork and support costs for the complete excavation of new foundations during the upgrade and replacement of wind turbines in onshore wind power, as well as the increased construction period, the generation of a large amount of construction waste, and the significant disturbance to on-site safety and the surrounding environment.

[0004] To achieve the above objectives, the present invention provides a method for constructing an extended foundation for onshore wind power with rebar anchoring, comprising the following steps: Step 1, Excavation of the existing foundation: Remove part of the concrete at the edge of the existing foundation slab and expose the reinforcing steel bars of the existing foundation slab. Step 2, Welding the Reinforcing Steel of the Old and New Foundation Slabs: Weld the reinforcing steel of the old foundation slab and the reinforcing steel of the new foundation slab together to form an integral reinforcing steel mesh; Step 3, Insertion of reinforcement bars on the side of the foundation slab: Insert one horizontal reinforcement bar on the side of the old foundation slab, and bend the exposed end of the inserted reinforcement bar upward at 90 degrees. Step 4, Slope trenching: Trenching is performed at the locations where steel bars need to be inserted into the old foundation slope to form a rebar trench; Step 5, slope reinforcement insertion: Place spiral steel bars and reinforcing bars 2 in the reinforcement insertion trench of the old foundation slope, and then pour concrete into the reinforcement insertion trench. Step 6, inserting steel bars on the side of the pier: insert three steel bars on the side of the old foundation pier, and bend the exposed end of the inserted steel bar upwards at a 90-degree angle. Step 7, Expansion Foundation Pouring: After the steel reinforcement is installed, formwork is erected on the outside of the old foundation and new concrete is poured to form a complete expansion foundation.

[0005] Preferably, the old foundation includes a base slab and columns, with the top surface of the base slab being a slope and the columns located at the center of the top surface of the base slab.

[0006] Preferably, the new foundation includes a first frustum and a second frustum, with the second frustum located at the center of the top surface of the first frustum.

[0007] Preferably, in step one, the bottom slab, the top surface and the bottom surface of the old foundation are all octagonal. After removing part of the concrete at the edge of the old foundation slab, the top surface and the bottom surface of the old foundation slab become circular.

[0008] Preferably, in step two, new steel bars are welded outward to the steel bars of the old foundation slab, thereby extending outward to form an integral steel mesh for the new foundation slab.

[0009] Preferably, in step three, one end of the inserted rebar is connected to the side of the old foundation slab, and the end of the inserted rebar away from the side of the old foundation slab is the exposed tail of the inserted rebar. The exposed tail of the inserted rebar is bent upward at 90 degrees and then parallel to the side of the old foundation slab.

[0010] Preferably, in step four, the inner opening of the rebar groove is larger than the outer opening; Step 5: The spiral steel bar is sleeved on the outside of the second implanted steel bar. One end of the second implanted steel bar is connected to the rebar trench of the old foundation slope through concrete. The end of the second implanted steel bar away from the slope of the old foundation is the exposed tail of the second implanted steel bar. After the exposed tail of the second implanted steel bar is bent 90 degrees toward the side of the old foundation column, it is parallel to the slope of the old foundation slope.

[0011] Preferably, in step six, one end of the inserted steel bar three is connected to the side of the old foundation column, and the end of the inserted steel bar three away from the side of the old foundation column is the exposed tail of the inserted steel bar three. The exposed tail of the inserted steel bar three is bent upward at 90 degrees and then parallel to the side of the old foundation column.

[0012] Preferably, in step seven, concrete is poured on the old foundation slab to form a new foundation truncated cone one, and concrete is poured on the old foundation column to form a new foundation truncated cone two.

[0013] The present invention also provides an onshore wind power rebar-supported expansion foundation, which is constructed using the above-mentioned construction method for an onshore wind power rebar-supported expansion foundation.

[0014] Therefore, the present invention, employing the above-mentioned onshore wind power rebar-supported expansion foundation and its construction method, has the following beneficial effects: 1. Economic efficiency: Traditional demolition and reconstruction methods are costly, consuming all new materials and generating huge demolition, removal and disposal costs; while the foundation expansion method described in this invention can eliminate demolition costs and make the most of the old foundation, saving a lot of material costs. 2. Construction period: The foundation expansion method described in this invention can save time in treating the old foundation. At the same time, the amount of work involved in foundation expansion is relatively small compared to reconstruction, which can further shorten the on-site operation time. 3. Environmental protection: The foundation expansion method described in this invention makes maximum use of the old foundation and avoids pollution caused by the old foundation; 4. Construction risks: The foundation expansion method described in this invention involves small-scale operations around the old foundation, which can reduce disturbance to the original soil of the site; 5. Stress Optimization: This invention optimizes the arrangement of the bottom plate reinforcement to ensure that the interface between the new and old concrete can effectively transmit force. The new and old steel meshes are welded together to form an integral stress frame, so that the expanded foundation can act as a complete single structure to effectively resist the huge overturning moment, horizontal thrust and cyclic load generated by the fresh air unit.

[0015] 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

[0016] Figure 1 This is a flowchart illustrating the steps of an embodiment of the construction method for an extended foundation for onshore wind power using rebar anchoring according to the present invention. Figure 2 This is a schematic diagram of the old foundation structure of an embodiment of the onshore wind power rebar-supported expansion foundation of the present invention; Figure 3 This is a perspective view of the bottom plate steel mesh structure and the embedded steel bar structure of an embodiment of the onshore wind power rebar expansion foundation of the present invention. Figure 4 This is a front view of the bottom plate steel mesh structure and the embedded steel bar structure of an embodiment of the onshore wind power rebar expansion foundation of the present invention; Figure 5 This is a top view of the bottom plate steel mesh structure and the embedded steel bar structure of an embodiment of the onshore wind power rebar expansion foundation of the present invention; Figure 6 This is a cross-sectional view of the old foundation structure of an embodiment of the extended foundation for onshore wind power rebar anchoring according to the present invention; Figure 7 This is a construction flowchart illustrating the connection details of an embodiment of the extended foundation for onshore wind power installation according to the present invention. Figure 8 This is a schematic diagram of the overall structure of the connection details of an embodiment of the onshore wind power rebar expansion foundation of the present invention; Figure 9 This is a schematic diagram of the connection details of an embodiment of the onshore wind power rebar expansion foundation according to the present invention. Figure 10 This is a front view of a new foundation according to an embodiment of the onshore wind power rebar-supported expansion foundation of the present invention; Figure 11 This is a cross-sectional view of a new foundation according to an embodiment of the extended foundation for onshore wind power rebar installation of the present invention; Figure 12 This is a top view of a new foundation according to an embodiment of the onshore wind power rebar-supported expansion foundation of the present invention; Figure 13 This is a perspective view of a new foundation according to an embodiment of the onshore wind power rebar-supported expansion foundation of the present invention; Figure 14 This is a perspective view of a new foundation according to an embodiment of the onshore wind power rebar expansion foundation of the present invention.

[0017] In the diagram: 1. Old foundation; 2. Base slab; 3. Column; 4. Slope; 5. New foundation; 6. Frustum I; 7. Frustum II; 8. Reinforcing mesh; 9. Inserted rebar I; 10. Inserted rebar II; 11. Inserted rebar III; 12. Rebar trench; 13. Old concrete; 14. New concrete; 15. Connecting rebar; 16. Spiral rebar. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0019] It should be noted that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or server that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or devices.

[0020] Similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this 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, they should not be construed as limiting this invention.

[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Example: The traditional demolition and reconstruction method essentially involves building a completely new and independent foundation structure on the original site. Its design is no different from that of a completely new wind farm foundation, requiring the construction of a larger new foundation pit, a completely new steel cage, a completely new concrete foundation, and a completely new anchor bolt cage.

[0024] The present invention adds a new foundation 5 on the basis of the old foundation 1. The old foundation 1 includes a base plate 2 and a pedestal 3. The top surface of the base plate 2 is a slope 4, and the pedestal 3 is located at the center of the top surface of the base plate 2. The new foundation 5 includes a first frustum 6 and a second frustum 7, with the second frustum 7 located at the center of the top surface of the first frustum 6.

[0025] like Figure 1 As shown, the present invention discloses an extended foundation for onshore wind power with rebar anchoring and its construction method, comprising the following steps: Step 1, Excavation of the existing foundation: (e.g.) Figure 2 As shown, part of the concrete at the edge of the original old foundation 1 base slab 2 was removed, and the reinforcing steel of the old foundation 1 base slab 2 was exposed.

[0026] The top and bottom surfaces of the base plate 2 and column 3 of the old foundation 1 are octagonal. After removing part of the concrete at the edge of the base plate 2 of the old foundation 1, the top and bottom surfaces of the base plate 2 of the old foundation 1 become circular.

[0027] Step 2, welding of the steel bars in the old and new base plates: (e.g.) Figures 3-6 As shown, the reinforcing bars of the old foundation 1 base plate 2 and the reinforcing bars of the new foundation 5 base plate 2 are welded together to form an integral reinforcing mesh 8.

[0028] New steel bars are welded outwards to the reinforcing bars of the old foundation 1 base slab 2, thereby extending outwards to form an integral steel mesh 8 of the new foundation 5 base slab 2. In order to enhance the integrity of the old and new foundations 1, this invention uses a method of chiseling away part of the old foundation 1 to expose its main reinforcing bars and connecting the old and new reinforcing bars. This method can make the old and new reinforcing bars form a complete steel mesh 8, and the force transmission of the reinforcing bars is more reasonable.

[0029] Step 3, Reinforcing bar insertion on the side of the base slab 2: Horizontally insert reinforcing bar 9 on the side of the base slab 2 of the old foundation 1. Bend the exposed end of reinforcing bar 9 upwards at a 90-degree angle to enhance the overall performance of the base slab 2 of the old and new foundations 1.

[0030] One end of the inserted steel bar 9 is connected to the side of the old foundation 1 base plate 2. The end of the inserted steel bar 9 away from the side of the old foundation 1 base plate 2 is the exposed tail of the inserted steel bar 9. The exposed tail of the inserted steel bar 9 is bent upward at 90 degrees and then parallel to the side of the old foundation 1 base plate 2.

[0031] Step 4, slope trenching: Trenching is carried out at the location where steel bars need to be inserted on the slope 4 of the old foundation 1 to form a rebar planting trench 12.

[0032] Step 5, Reinforcing bar insertion on slope 4: Place spiral reinforcing bars 16 and reinforcing bars 2 10 in the rebar insertion groove 12 of slope 4 on the old foundation 1. The exposed tail of the reinforcing bars 2 10 is bent parallel to the slope surface, thereby enhancing the overall slope performance of the old and new foundations 1.

[0033] One end of the inserted steel bar 210 is connected to the slope surface of the slope 4 of the old foundation 1. The end of the inserted steel bar 210 away from the slope surface of the slope 4 of the old foundation 1 is the exposed tail of the inserted steel bar 210. After the exposed tail of the inserted steel bar 210 is bent 90 degrees toward the side of the column 3 of the old foundation 1, it is parallel to the slope surface of the slope 4 of the old foundation 1.

[0034] like Figures 7-9 As shown, steps four and five involve a detailed connection structure, including old concrete 13, new concrete 14, rebar groove 12, connecting rebar 15 (equivalent to embedded rebar 10), and spiral rebar 16. The construction method is as follows: S1, the old concrete 13 needs to be grooved to form a rebar groove 12 for the insertion of connecting rebars 15. The rebar groove 12 has a larger inner opening and a smaller outer opening. S2, the anchoring groove 12 is used to place the spiral steel bar 16 and the connecting steel bar 15. The spiral steel bar 16 is sleeved on the outside of the connecting steel bar 15. The connecting steel bar 15 is used to connect the old concrete 13 and the new concrete 14, and the spiral steel bar 16 is used to reinforce the connection between the connecting steel bar 15 and the old concrete 13. After the spiral steel bar 16 and connecting steel bar 15 are installed, the anchoring groove 12 needs to be filled with concrete and fixed to the old concrete 13.

[0035] Step 6, Reinforcing bar insertion on the side of column 3: Insert reinforcing bar 311 on the side of column 3 of the old foundation 1. Bend the exposed end of the inserted reinforcing bar upward at 90 degrees to enhance the overturning resistance of the old and new foundations 1.

[0036] One end of the inserted steel bar 311 is connected to the side of the old foundation 1 column 3. The end of the inserted steel bar 311 away from the side of the old foundation 1 column 3 is the exposed tail of the inserted steel bar 311. The exposed tail of the inserted steel bar 311 is bent upward at 90 degrees and is parallel to the side of the old foundation 1 column 3.

[0037] Step 7, Expansion Foundation Pouring: After the reinforcement is installed, formwork is erected on the outside of the old foundation 1 and new concrete is poured to form a complete expansion foundation.

[0038] like Figures 10-13 Concrete is poured on the old foundation 1 base slab 2 to form a new foundation 5 truncated cone 6, and concrete is poured on the old foundation 1 column 3 to form a new foundation 5 truncated cone 7.

[0039] like Figure 14 As shown, the above-mentioned construction method for an extended onshore wind power rebar-supported foundation forms an extended onshore wind power rebar-supported foundation.

[0040] Therefore, the present invention adopts the above-mentioned onshore wind power rebar-supported expansion foundation and its construction method to solve the problems of high costs for crushing and clearing the old foundation 1 and the earthwork and support costs for the complete excavation of the new foundation 5 during the wind turbine upgrade process, as well as the increased construction period, the generation of a large amount of construction waste, and the significant disturbance to on-site safety and the surrounding environment.

[0041] 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 method for constructing an extended foundation for onshore wind power with rebar anchoring, characterized in that, Includes the following steps: Step 1, Excavation of the existing foundation: Remove part of the concrete at the edge of the existing foundation slab and expose the reinforcing steel bars of the existing foundation slab. Step 2, Welding the Reinforcing Steel of the Old and New Foundation Slabs: Weld the reinforcing steel of the old foundation slab and the reinforcing steel of the new foundation slab together to form an integral reinforcing steel mesh; Step 3, Insertion of reinforcement bars on the side of the foundation slab: Insert one horizontal reinforcement bar on the side of the old foundation slab, and bend the exposed end of the inserted reinforcement bar upward at 90 degrees. Step 4, Slope trenching: Trenching is performed at the locations where steel bars need to be inserted into the old foundation slope to form a rebar trench; Step 5, slope reinforcement insertion: Place spiral steel bars and reinforcing bars 2 in the reinforcement insertion trench of the old foundation slope, and then pour concrete into the reinforcement insertion trench. Step 6, inserting steel bars on the side of the pier: insert three steel bars on the side of the old foundation pier, and bend the exposed end of the inserted steel bar upwards at a 90-degree angle. Step 7, Expansion Foundation Pouring: After the steel reinforcement is installed, formwork is erected on the outside of the old foundation and new concrete is poured to form a complete expansion foundation.

2. The construction method of the onshore wind power rebar-supported extended foundation according to claim 1, characterized in that: The old foundation consists of a base slab and columns. The top surface of the base slab is a slope, and the columns are located at the center of the top surface of the base slab.

3. The construction method of the onshore wind power rebar-supported extended foundation according to claim 2, characterized in that: The new foundation consists of frustum I and frustum II, with frustum II located at the center of the top surface of frustum I.

4. The construction method of the onshore wind power rebar-supported extended foundation according to claim 3, characterized in that: In step one, the bottom slab, the top surface and the bottom surface of the old foundation are all octagonal. After removing part of the concrete at the edge of the old foundation slab, the top surface and the bottom surface of the old foundation slab become circular.

5. The construction method of the onshore wind power rebar-supported extended foundation according to claim 4, characterized in that: In step two, new steel bars are welded outward from the steel bars of the old foundation slab, thereby extending outward to form the overall steel mesh of the new foundation slab.

6. The construction method of the onshore wind power rebar-supported extended foundation according to claim 5, characterized in that: In step three, one end of the inserted rebar is connected to the side of the old foundation slab, and the end of the inserted rebar away from the side of the old foundation slab is the exposed tail of the inserted rebar. The exposed tail of the inserted rebar is bent upward at 90 degrees and then parallel to the side of the old foundation slab.

7. The construction method of the onshore wind power rebar-supported extended foundation according to claim 6, characterized in that: In step four, the inner opening of the rebar insertion groove is larger than the outer opening; Step 5: The spiral steel bar is sleeved on the outside of the second implanted steel bar. One end of the second implanted steel bar is connected to the rebar trench of the old foundation slope through concrete. The end of the second implanted steel bar away from the slope of the old foundation is the exposed tail of the second implanted steel bar. After the exposed tail of the second implanted steel bar is bent 90 degrees toward the side of the old foundation column, it is parallel to the slope of the old foundation slope.

8. The construction method of the onshore wind power rebar-supported extended foundation according to claim 7, characterized in that: In step six, one end of the inserted rebar 3 is connected to the side of the old foundation column, and the end of the inserted rebar 3 away from the side of the old foundation column is the exposed tail of the inserted rebar 3. The exposed tail of the inserted rebar 3 is bent upward at 90 degrees and then parallel to the side of the old foundation column.

9. The construction method of the onshore wind power rebar-supported extended foundation according to claim 8, characterized in that: In step six, concrete is poured on the old foundation slab to form the first new foundation truncated cone, and concrete is poured on the old foundation columns to form the second new foundation truncated cone.

10. A type of extended foundation for onshore wind power with rebar anchoring, characterized in that: It is constructed using the construction method of the onshore wind power rebar-supported expansion foundation as described in any one of claims 1-9.

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