A fan foundation support with a multi-layer insulation structure
By combining a multi-layer insulation structure with a heating duct, the problem of temperature shrinkage stress in concrete structures in cold regions is solved, achieving all-round insulation of the fan foundation and ensuring structural stability and durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG POWER ENG
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-03
AI Technical Summary
In the foundation construction of large wind turbine generators in high-altitude and cold regions, the temperature shrinkage stress and cracking problems caused by the temperature difference between the inside and outside of the concrete structure are not effectively addressed by traditional insulation measures, which affect the structural safety and durability.
The fan foundation support adopts a multi-layer insulation structure, including a fiber-reinforced insulation layer, a reflective insulation layer, and a thermal insulation layer. Combined with heating air ducts and temperature sensors, it monitors and adjusts the concrete temperature in real time to reduce the temperature difference between the inside and outside.
It effectively reduces the temperature difference between the inside and outside of concrete, prevents crack formation, ensures the long-term safety and durability of the wind turbine foundation structure, and is suitable for construction in extremely cold environments.
Smart Images
Figure CN224451704U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of wind power equipment construction, specifically a wind turbine foundation support with a multi-layer insulation structure. Background Technology
[0002] In the foundation construction of large-scale wind turbine generators (especially those with a capacity of 10MW and above) in high-altitude and cold regions, the large-volume concrete pouring project faces severe technical challenges. Cement releases a large amount of heat of hydration during the hydration reaction, leading to a significant increase in the internal temperature of the concrete structure. Due to the extremely low external ambient temperature in these regions, a dramatic internal and external temperature gradient is formed during the concrete hardening process: the core area of the structure is at a high temperature, while the surface area cools rapidly due to the low-temperature environment.
[0003] This drastic temperature difference produces two destructive effects within the concrete: first, the expansion of the high-temperature internal concrete is constrained by the low-temperature surface layer, creating tensile stress; second, the cooling and shrinkage of the surface concrete is constrained internally, further exacerbating stress concentration. When the resulting temperature shrinkage stress exceeds the tensile strength limit of the concrete, it will trigger the formation and development of structural cracks.
[0004] Such temperature cracks not only damage the integrity of concrete but also seriously threaten the long-term safety and durability of wind turbine foundation structures. Especially in extreme low-temperature environments, the frost heave effect caused by moisture seeping into the cracks accelerates structural deterioration, posing a significant risk of reduced foundation load-bearing capacity. Traditional insulation measures (such as straw mat covering and ordinary insulation boards) have shortcomings such as insufficient insulation performance, poor weather resistance, and low construction adaptability. There is an urgent need to develop an insulation structure specifically designed to address the temperature gradient problem in large-volume concrete. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model aims to provide a fan foundation support with a multi-layer insulation structure to reduce the temperature difference between the inside and outside of the concrete.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a wind turbine foundation support with a multi-layer insulation structure, comprising a support body covering the upper end and side of the wind turbine foundation steel reinforcement system, the support body comprising, from the inside out, a fiber-reinforced insulation layer composed of fiber material, a reflective insulation layer composed of several layers of metal foil composite structure or reflective heat insulation material, and a heat insulation layer composed of heat insulation material.
[0007] As a limitation of this utility model: the reflective heat insulation material comprises, from the inside out, a heat insulation material layer and a heat reflective coating layer.
[0008] As a limitation of this utility model: a heating air duct is embedded in the inner wall of the bracket body.
[0009] As a limitation of this utility model: the heating air duct includes several first air ducts embedded in the top wall of the support body. The several first air ducts are all circular and arranged concentrically at equal intervals. Several first air inlets and first air outlets extending outward are provided on the first air ducts.
[0010] As a limitation of this utility model: a plurality of first air inlets are set at an acute angle to the first air duct in the height direction and in the same direction of inclination; a plurality of first air outlets are set at an acute angle to the first air duct in the height direction, and the inclination direction of the first air outlets is opposite to that of the inclination direction of the first air inlets.
[0011] As a limitation of this utility model: the first air outlet is located at the far end of the air supply direction of the first air inlet on the first air duct.
[0012] As a limitation of this utility model: the heating air duct includes several second air ducts embedded in the side wall of the support body. The several second air ducts are all circular and arranged vertically. The second air ducts are provided with several outwardly extending second air inlets and second air outlets.
[0013] As a limitation of this utility model: a plurality of second air inlets are arranged at an acute angle to the second air duct in the horizontal direction and in the same direction of inclination; a plurality of second air outlets are arranged at an acute angle to the second air duct in the horizontal direction, and the inclination direction of the second air outlets is opposite to that of the inclination direction of the second air inlets.
[0014] As a limitation of this utility model: the second air outlet is located at the far end of the air supply direction of the second air inlet on the second air duct.
[0015] As a limitation of this utility model, it also includes several temperature sensors and strain gauge sensors installed inside the steel reinforcement system of the wind turbine foundation, and both temperature sensors and strain gauge sensors are connected to the data acquisition system.
[0016] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:
[0017] (1) This utility model has a three-layer insulation structure. The fiber-reinforced insulation layer is mainly used to prevent early surface stress cracking of concrete and provide additional strength support. At the same time, it plays a buffering role against internal temperature fluctuations. The reflective insulation layer can effectively reduce the heat loss of concrete and reflect internal heat to maintain the temperature stability of concrete. The insulation layer provides long-term and stable insulation effect for concrete, prevents the cold external environment from directly affecting the external concrete temperature, thereby reducing the temperature difference between the inside and outside of concrete. The three insulation layers work together from different angles to provide comprehensive reinforcement and insulation effects.
[0018] (2) The support body of this utility model is equipped with a heating air duct, which can provide additional heating effect before, during and after concrete pouring and curing. The structural design of the heating air duct provides efficient and uniform heating to the outside of the fan foundation, further avoiding stress concentration caused by the temperature difference between inside and outside.
[0019] (3) This utility model also incorporates a data monitoring system using temperature sensors and strain gauge sensors. Temperatures in northern regions change rapidly, especially in the early morning and late at night when temperatures drop significantly. The data monitoring system monitors the temperature and stress changes inside the wind turbine foundation in real time, allowing for timely heating via the heating duct when needed, ensuring accurate matching of temperature control data with environmental factors. The completed system can operate stably in ambient temperatures ranging from -40°C to +60°C, possessing all-weather, real-time monitoring capabilities; it can safely and stably complete the installation of wind turbines of 10MW and above in cold regions.
[0020] In summary, this utility model, based on the design of a 10MW wind turbine foundation, provides comprehensive insulation, preventing cracks and other potential risks caused by excessive internal and external temperature differences, and is suitable for the construction process of large-volume concrete in extremely cold environments. Attached Figure Description
[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0022] Figure 1 This is a front view of an embodiment of the present utility model;
[0023] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;
[0024] Figure 3 for Figure 2 Enlarged view of section A;
[0025] Figure 4 This is a schematic diagram showing the positions of the first and second air ducts in an embodiment of this utility model.
[0026] In the diagram: 1-Support body, 11-Fiber reinforced insulation layer, 12-Reflective insulation layer, 13-Insulation layer;
[0027] 2-Heating air duct, 21-First air duct, 22-First air inlet, 23-First air outlet, 24-Second air duct, 25-Second air inlet, 26-Second air outlet;
[0028] 3-Pouring hole. Detailed Implementation
[0029] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. It should be understood that the fan foundation support with a multi-layer insulation structure described herein is a preferred embodiment and is only used for illustration and explanation of this utility model, and does not constitute a limitation thereof.
[0030] The directional terms or positional relationships used in this utility model, such as "up," "down," "left," and "right," are based on the positional relationships in the accompanying drawings of this utility model. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model. Example
[0031] This implementation example Figures 1-4 As shown, a fan foundation support with a multi-layer insulation structure includes a support body 1 and a heating air duct 2 embedded in the support body 1.
[0032] like Figure 2 , Figure 3 As shown, the support body 1 is supported by the steel reinforcement system of the wind turbine foundation, covering the upper and side surfaces of the steel reinforcement system of the wind turbine foundation. It conforms to the external shape of the steel reinforcement system of the wind turbine foundation, forming a covered structure for easy erection. The support body 1, from the inside out, includes a fiber-reinforced insulation layer 11, a reflective heat insulation layer 12, and a thermal insulation layer 13. The fiber-reinforced insulation layer 11 is 5–8 cm thick and composed of fiber materials, such as asbestos or glass fiber. The fiber-reinforced insulation layer 11 prevents early surface stress cracking of the concrete, provides additional strength support, and buffers internal temperature fluctuations. The reflective heat insulation layer 12 is 3–5 cm thick and consists of several layers of metal foil composite structure or reflective heat insulation material. The reflective heat insulation material, from the inside out, includes an insulation material layer and a heat-reflective coating layer. The insulation material layer is composed of insulation materials, such as rock wool or polystyrene foam, and the heat-reflective coating layer is composed of heat-reflective coatings available in the prior art. The reflective insulation layer 12 effectively reduces heat loss from the concrete, reflecting internal heat to maintain the concrete's temperature stability. The thermal insulation layer 13, 10-15cm thick, is composed of insulation materials such as rock wool and polystyrene foam, providing long-term, stable insulation to the concrete and preventing the cold external environment from directly affecting its temperature. These three insulation layers work together from different angles to provide comprehensive reinforcement and insulation. The support body 1 has pouring holes 3 for concrete pouring; the location and number of these holes can be configured as needed.
[0033] Furthermore, a heating air duct 2 is embedded in the inner wall of the support body 1, such as... Figure 3As shown, to ensure insulation, the outer wall of the heating duct 2 is tangent to the inner wall of the support body 1, and the size of the heating duct 2 is smaller than the thickness of the support body 1 to prevent the heating duct 2 from being exposed and thus losing heat. Furthermore, the heating duct 2 includes several first air ducts 21 embedded in the top wall of the support body 1. In this embodiment, three first air ducts 21 are provided, all of which are circular, and the three first air ducts 21 are arranged concentrically and equidistantly to make heating more uniform. The number and location of the first air ducts 21 can be adaptively adjusted according to the insulation needs of different regions. Several outwardly extending first air inlets 22 and first air outlets 23 are provided on the first air ducts 21. The first air inlets 22 are used to connect to the heater. Figure 1 , Figure 4 As shown, in this embodiment, the two larger first air ducts 21 are provided with four first air inlets 22 and four first air outlets 23, while the smaller first air duct 21 is provided with two first air inlets 22 and two first air outlets 23. The number of first air inlets 22 and first air outlets 23 can be adjusted as needed. Several first air inlets 22 are set at an acute angle to the first air ducts 21 in the height direction, and the inclination direction is the same. With this arrangement, the warm air entering the first air ducts 21 through the several first air inlets 22 can all flow in the first air ducts 21 in the same direction. The first air outlet 23 is located at the far end of the first air inlet 22 in the first air duct 21, in the direction of air delivery. This allows the warm air entering the first air duct 21 through the first air inlet 22 to be delivered out of the first air duct 21 after circulating around it once. When multiple first air inlets 22 and first air outlets 23 are provided, the warm air that has undergone heat exchange in the first air duct 21 is delivered out from different first air outlets 23. Several first air outlets 23 are arranged at an angle to the first air duct 21 in the height direction, and the tilt direction of the first air outlets 23 is opposite to the tilt direction of the first air inlet 22, which facilitates the delivery of warm air after heat exchange. Figure 4 The arrows in the image indicate the direction in which the warm air is being delivered and delivered. Figure 4The diagram shows the fiber-reinforced insulation layer 11 and the heating duct 2. Further, a one-way valve (not shown) allowing only warm air to enter can be installed in the first air inlet 22, and a one-way valve (not shown) allowing only the warm air after heat exchange to exit can be installed in the first air outlet 23, further preventing heat loss. The heating duct 2 also includes several second air ducts 24 embedded in the side wall of the support body 1. In this embodiment, one second air duct 24 is provided. The second air duct 24 is circular, and the number of second air ducts 24 can be adjusted as needed. When multiple second air ducts 24 are provided, they are arranged vertically. Several outwardly extending second air inlets 25 and second air outlets 26 are provided on each second air duct 24. In this embodiment, four second air inlets 25 and four second air outlets 26 are provided, and the number of second air inlets 25 and second air outlets 26 can be adjusted as needed. Similar to the arrangement of the first air inlet 22 and the first air outlet 23, the second air inlet 25 is set at an acute angle to the second air duct 24 in the horizontal direction, and the inclination direction is the same. The second air outlet 26 is set at an acute angle to the second air duct 24 in the horizontal direction, and the inclination direction of the second air outlet 26 is opposite to that of the second air inlet 25. The second air outlet 26 is located at the far end of the air supply direction of the second air inlet 25 on the second air duct 24, which will not be described in detail here.
[0034] To monitor temperature and strain changes within the wind turbine foundation in real time, and thus provide heating as needed using a warm air blower, this embodiment also includes several temperature sensors and strain gauge sensors (not shown in the figure) installed within the steel reinforcement system of the wind turbine foundation. The temperature sensors are distributed at the bottom, middle, and top of the steel reinforcement system, forming a temperature profile. Both the temperature sensors and strain gauge sensors are connected to a data acquisition system, and dynamic monitoring of temperature and stress is achieved by setting a sampling time interval. The structures of the temperature sensors and strain gauge sensors are existing technologies and will not be described in detail here.
[0035] After the steel reinforcement system of the wind turbine foundation is erected, this embodiment is erected on the steel reinforcement system according to its shape and size. After the concrete is poured through the pouring hole 3, this embodiment can effectively insulate the wind turbine foundation. During the curing process, the internal temperature and strain of the concrete are continuously monitored. When the internal and external temperatures of the concrete reach the set value, or when the strain reaches the set value, the external temperature is raised by connecting the heating channel through the warm air blower, thereby reducing the internal and external temperature difference of the concrete. Of course, preheating and heating can also be carried out by connecting the heating channel through the warm air blower before and during the pouring of concrete.
Claims
1. A fan foundation support having a multi-layer thermal insulation structure, characterized by: The support body includes the upper end and sides of the wind turbine foundation steel reinforcement system. The support body consists of, from the inside out, a fiber-reinforced insulation layer composed of fiber material, a reflective insulation layer composed of several layers of metal foil composite structure or reflective heat insulation material, and a heat insulation layer composed of heat insulation material.
2. The fan foundation support having a multi-layer thermal insulation structure according to claim 1, characterized in that: The reflective heat insulation material comprises, from the inside out, a heat insulation material layer and a heat-reflective coating layer.
3. The fan foundation support having a multi-layer thermal insulation structure according to claim 1 or 2, characterized in that: Heating air ducts are embedded in the inner wall of the support body.
4. The fan foundation support having a multi-layer thermal insulation structure according to claim 3, characterized in that: The heating air duct includes several first air ducts embedded in the top wall of the support body. The several first air ducts are all circular and arranged concentrically at equal intervals. Several first air inlets and first air outlets extending outward are provided on the first air ducts.
5. The fan foundation support having a multi-layer thermal insulation structure according to claim 4, characterized in that: Several first air inlets are set at an acute angle to the first air duct in the height direction and in the same direction of inclination. Several first air outlets are set at an acute angle to the first air duct in the height direction, and the inclination direction of the first air outlets is opposite to that of the first air inlets.
6. The fan foundation support having a multi-layer thermal insulation structure according to claim 5, characterized in that: The first air outlet is located at the far end of the air supply direction of the first air inlet on the first air duct.
7. The fan foundation support having a multi-layer thermal insulation structure according to claim 6, characterized in that: The heating air duct includes several second air ducts embedded in the side wall of the support body. The several second air ducts are all circular and arranged vertically. The second air ducts are provided with several outwardly extending second air inlets and second air outlets.
8. The fan foundation support having a multi-layer thermal insulation structure according to claim 7, characterized in that: Several second air inlets are set at an acute angle to the second air duct in the horizontal direction, and the inclination directions are the same. Several second air outlets are set at an acute angle to the second air duct in the horizontal direction, and the inclination direction of the second air outlets is opposite to that of the second air inlets.
9. The fan foundation support having a multi-layer thermal insulation structure according to claim 8, characterized in that: The second air outlet is located at the far end of the air supply direction of the second air inlet on the second air duct.
10. The fan foundation support having a multi-layer thermal insulation structure according to claim 9, characterized in that: It also includes several temperature sensors and strain gauge sensors installed inside the steel reinforcement system of the wind turbine foundation, and both temperature sensors and strain gauge sensors are connected to the data acquisition system.