Combined stress type fan foundation
By adding foundation beams, concealed beams and top beams on the original fan base to form a combined stress-type fan foundation, the stability and safety problems of old fan foundations are solved, efficient transformation, upgrading and resource utilization are achieved, and the economy of the wind farm is improved.
Patent Information
- Application Number
- CN202422450123.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-10
AI Technical Summary
In the renovation of old fans, the gap between the foundation ring and concrete becomes larger and the foundation cracks are caused by poor safety and economy, and the in-situ transformation technology is not yet mature.
The foundation beam, concealed beam and top beam are added on the original fan base, and a combined stressed anchor bolt is connected to form a combined stressed fan foundation, which uses the stress performance of dense piles to enhance overall stability and safety, and is used for resource utilization.
It improves the safety and economy of the fan base, reduces project costs and construction periods, and makes full use of the original infrastructure to achieve efficient transformation and upgrading.
Smart Images
Figure CN223189730U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wind power generation, in particular to a combined force-bearing wind turbine foundation. Background Art
[0002] With the development of high-power wind turbines, some are entering the late stages of their life cycles. This has led to problems such as widening gaps between the foundation ring and the concrete, as well as cracking in the foundation, in some wind turbine foundations. These problems pose a serious threat to the safe and stable operation of the wind turbines. In June 2023, the National Energy Administration issued the "Management Measures for the Retrofit, Upgrade, and Decommissioning of Wind Farms," which encourage retrofits and decommissioning of wind farms with a grid connection of more than 15 years and under 1.5 MW. In accordance with these measures, many older wind farms across the country are planning capacity upgrades or expansions.
[0003] The process of retrofitting old wind turbines often requires extensive modifications to the turbine head and tower to create high-quality, high-yield wind farms. This increases the load on the new turbines and increases the size of the towers, making them incompatible with the existing foundation rings. Therefore, upgrading and renovating existing wind turbine foundations is a key development direction for renewable energy wind power in my country. Currently, wind farm retrofit projects typically involve dismantling existing turbine foundations and constructing new ones. However, in-situ retrofitting techniques are not yet mature and advanced, and are associated with limited safety and cost-effectiveness. Utility Model Content
[0004] The purpose of the utility model is to provide a combined force-bearing wind turbine foundation, which can be directly improved on the original wind turbine foundation. On the basis of safety, it can maximize the resource utilization of the original foundation and facilities, thereby improving economic efficiency.
[0005] The utility model provides a combined force-bearing fan foundation, comprising an original fan foundation and a reinforced fan foundation, wherein the reinforced fan foundation is arranged on the original fan foundation;
[0006] The original wind turbine foundation includes a foundation cone, and a top platform is provided at the center of the top of the foundation cone. The reinforced wind turbine foundation includes a foundation beam, a hidden beam and a top platform beam of an integrated structure. The foundation beam is arranged above the foundation cone, and the hidden beam is arranged along the outer periphery of the foundation cone. A reinforced top platform is provided on the top of the top platform, and the top platform beam is arranged along the periphery of the reinforced top platform. The top platform beam and the foundation cone are connected by vertically arranged prestressed anchor bolts. The bottom height of the hidden beam is lower than the bottom of the foundation cone, and a beam armpit is provided between the bottom of the hidden beam and the bottom of the foundation cone.
[0007] Preferably, a plurality of reinforcing steel bars are provided in the foundation beam, and the reinforcing steel bars are anchored into the foundation cone.
[0008] Preferably, the reinforcing steel bars are welded to the anchor cage steel bars inside the foundation cone.
[0009] Preferably, a plurality of groups of prestressed anchor bolts are provided on the top platform beam, and each group of prestressed anchor bolts is distributed circumferentially on the top platform beam.
[0010] Preferably, a connecting plate is provided on the top platform beam, and a through hole is provided on the connecting plate, and the prestressed anchor bolts extend downward through the connecting plate.
[0011] Preferably, a plurality of pile foundations are provided around the bottom of the base cone, and the pile foundations are arranged vertically.
[0012] Preferably, a plurality of densely distributed piles are provided at the bottom of the hidden beam, and the densely distributed piles are symmetrically arranged around the center of the hidden beam.
[0013] Preferably, the surface of the original fan foundation is roughened.
[0014] Preferably, the top height of the foundation beam is lower than the outdoor floor.
[0015] Preferably, the top of the roof beam is more than 1 meter above the outdoor floor.
[0016] Beneficial effects:
[0017] The utility model is directly improved on the basis of the original wind turbine, and foundation beams are arranged on the top and periphery of the foundation cone, and beam axils are arranged between the bottom of the hidden beam and the bottom of the foundation cone to enhance stability; the top platform beam is fixedly connected to the foundation cone by prestressed anchor bolts, which improves the integrity between the reinforced wind turbine foundation and the original wind turbine foundation, makes the reinforced wind turbine foundation and the original wind turbine foundation combined to bear force, enhances the safety of the wind turbine foundation, maximizes the resource utilization of the original foundation and facilities, and improves the economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 This is a top view of the overall structure of the utility model;
[0020] Figure 2 It is a partial cross-sectional schematic diagram of the present utility model.
[0021] Description of reference numerals:
[0022] 1- original wind turbine foundation, 2- hidden beam, 201- beam armpit, 3- densely distributed piles, 4- foundation beam, 401- reinforced steel bars, 5- connecting plate, 6- top platform beam, 7- prestressed anchor bolts, 8- wind turbine tower, 9- original pile foundation. DETAILED DESCRIPTION
[0023] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.
[0026] Example 1
[0027] like Figure 1-2 As shown, a combined force-bearing fan foundation includes an original fan foundation 1 and a reinforced fan foundation, wherein the reinforced fan foundation is arranged on the original fan foundation 1; the surface of the original fan foundation 1 is roughened, which helps to better bond and fix the original fan foundation 1 and the reinforced fan foundation.
[0028] The original wind turbine foundation 1 includes a foundation truncated cone, a plurality of pile foundations 9 are arranged circumferentially at the bottom of the foundation truncated cone, the pile foundations 9 are arranged vertically, and a top platform is provided at the center of the top of the foundation truncated cone.
[0029] The reinforced wind turbine foundation comprises an integrated foundation beam 4, a concealed beam 2, and a top platform beam 6. The reinforced wind turbine foundation is cast on the surface of the existing wind turbine foundation 1. The foundation beam 4 is positioned above the foundation truncated cone. Several radially extending reinforcement beams are positioned within the foundation beam 4 to enhance its stability. Several reinforcing steel bars 401 are embedded within the foundation beam 4. These steel bars 401 are anchored into the foundation truncated cone, the top platform beam 6, and the concealed beam 2. The reinforcement bars 401 are welded to the anchor cage reinforcement within the foundation truncated cone. The stable connection between the reinforcement bars 401 and the reinforcement beams enhances the integrity of the reinforced wind turbine foundation and the existing wind turbine foundation 1, ensuring a combined load-bearing effect and enhancing the safety of the wind turbine foundation.
[0030] A concealed beam 2 is arranged along the periphery of the foundation cone. The top of the concealed beam 2 and the bottom of the foundation beam 4 can be welded together to form an integrated structure. Several densely distributed piles 3 are located at the bottom of the concealed beam 2, symmetrically arranged about the center of the concealed beam 2. The bottom of the concealed beam 2 is lower than the bottom of the foundation cone, and a beam abutment 201 is provided between the bottom of the concealed beam 2 and the bottom of the foundation cone. The sides and bottom of the foundation cone adjacent to the concealed beam 2 are fixedly connected to the concealed beam 2 via steel bars, enhancing the integrity of the concealed beam 2 and the original wind turbine foundation 1. This structure fully utilizes the load-bearing capacity of the densely distributed piles 3. The spacing between the densely distributed piles 3 is less than the minimum pile spacing required by the standard, and the number of piles is relatively large. Their vertical and horizontal load-bearing capacity and stiffness are significantly higher than those required by conventional standards. The densely distributed piles 3, the original wind turbine foundation 1, and the reinforced wind turbine foundation form a combined load-bearing system, significantly reducing the bottom area of the reinforced foundation, meeting the area requirements for improving the original wind turbine foundation 1, while effectively reducing project costs and construction time.
[0031] A reinforced roof is provided on the top of the roof, and a wind turbine tower 8 is provided on the top of the reinforced roof. A roof beam 6 is provided along the periphery of the reinforced roof, and the roof beam 6 is located above the foundation cone. The roof beam 6 and the foundation cone are connected by vertically arranged prestressed anchor bolts 7. One end of the steel bar beam in the foundation beam 4 is anchored into the roof beam 6 to strengthen the connection between the foundation beam 4 and the roof beam 6. Several groups of prestressed anchor bolts 7 are provided on the roof beam 6, and each group of prestressed anchor bolts 7 is distributed circumferentially on the roof beam 6. Preferably, two groups of prestressed anchor bolts 7 are provided on the roof beam 6 from the inside to the outside, and are connected to the prestressed anchor bolts in the original foundation through a connecting plate 5. An annular connecting plate 5 is provided on the roof beam 6, and a through hole is provided on the connecting plate 5. The prestressed anchor bolts 7 all pass through the connecting plate 5 and extend downward to the foundation cone. By providing the connecting plate 5 and connecting with the prestressed anchor bolts in the original wind turbine foundation, the overall force effect is improved.
[0032] The top of the foundation beam 4 is lower than the outdoor floor, which is convenient for covering the outdoor floor with green plants after the overall combined load-bearing wind turbine foundation is completed to increase the green area. The top of the top beam 6 is more than 1 meter above the outdoor floor, which is convenient for installing the wind turbine tower 8.
[0033] A construction method for a combined force-bearing wind turbine foundation comprises the following steps:
[0034] S1. The outer surface of the original wind turbine foundation 1 is roughened, and several reinforcing steel bars 401 are set in the foundation beam 4. The reinforcing steel bars 401 are anchored into the foundation truncated table, the top platform beam 6 and the hidden beam 2; and the reinforcing steel bars 401 are welded to the original anchor cage steel bars in the foundation truncated table to improve the overall stiffness between the reinforcing steel bars 401 and the original wind turbine foundation 1, so that the foundation beam 4 is tightly connected to the original wind turbine foundation 1, and the integrity between the foundation beam 4 and the top platform beam 6 and the hidden beam 2 is enhanced; the connection between the hidden beam 2 and the foundation truncated table is strengthened by steel bars;
[0035] S2. A reinforced top platform, foundation beam 4, concealed beam 2, and top platform beam 6 are cast on the surface of the original wind turbine foundation 1, forming an integrated structure through casting. Several densely distributed piles 3 are set at the bottom of the concealed beam 2, and the densely distributed piles 3 are arranged symmetrically along the center of the concealed beam 2. One end of the steel beam in the foundation beam 4 is anchored to the top platform beam 6, and the other end is anchored to the concealed beam 2. A connecting plate 5 is set at the top of the top platform beam 6, and prestressed anchor bolts 7 pass through the connecting plate 5 and the top platform beam 6 and are anchored into the foundation circular platform. The height of the top platform beam 6 can be determined according to the length of the prestressed anchor bolts 7. The top of the top platform beam 6 is at least 1 meter above the outdoor floor.
[0036] S3. The top of foundation beam 4 is lower than the outdoor floor, which facilitates covering the outdoor floor surface with green plants after the overall combined load-bearing wind turbine foundation renovation is completed.
[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A combined force-bearing wind turbine foundation, characterized in that: It comprises an original fan foundation and a reinforced fan foundation, wherein the reinforced fan foundation is arranged on the original fan foundation; The original wind turbine foundation includes a foundation cone, and a top platform is provided at the center of the top of the foundation cone. The reinforced wind turbine foundation includes a foundation beam, a hidden beam and a top platform beam of an integrated structure. The foundation beam is arranged above the foundation cone, and the hidden beam is arranged along the outer periphery of the foundation cone. A reinforced top platform is provided on the top of the top platform, and the top platform beam is arranged along the periphery of the reinforced top platform. The top platform beam and the foundation cone are connected by vertically arranged prestressed anchor bolts. The bottom height of the hidden beam is lower than the bottom of the foundation cone, and a beam armpit is provided between the bottom of the hidden beam and the bottom of the foundation cone.
2. The combined force-bearing wind turbine foundation according to claim 1, characterized in that: A plurality of reinforcing steel bars are provided in the foundation beam, and the reinforcing steel bars are anchored into the foundation truncated cone.
3. The combined force-bearing wind turbine foundation according to claim 2, characterized in that: The reinforcing steel bars are welded to the anchor cage steel bars inside the foundation cone.
4. The combined force-bearing wind turbine foundation according to claim 1, characterized in that: A plurality of groups of prestressed anchor bolts are provided on the top platform beam, and each group of prestressed anchor bolts is distributed circumferentially on the top platform beam.
5. The combined force-bearing wind turbine foundation according to claim 4, characterized in that: A connecting plate is provided on the top platform beam, and a through hole is provided on the connecting plate. The prestressed anchor bolts all extend downward through the connecting plate.
6. The combined force-bearing wind turbine foundation according to claim 1, characterized in that: A plurality of pile foundations are provided on the circumference of the bottom of the basic truncated cone, and the pile foundations are arranged vertically.
7. The combined force-bearing wind turbine foundation according to claim 1, characterized in that: A plurality of dense piles are provided at the bottom of the hidden beam, and the dense piles are symmetrically arranged around the center of the hidden beam.
8. The combined force-bearing wind turbine foundation according to claim 1, characterized in that: The surface of the original fan foundation is roughened.
9. The combined force-bearing wind turbine foundation according to claim 1, characterized in that: The top height of the foundation beam is lower than the outdoor floor.
10. The combined force-bearing wind turbine foundation according to claim 1, characterized in that: The top of the roof beam is more than 1 meter higher than the outdoor floor.