In-situ capacity expansion reinforcing structure of small-capacity wind power supporting structure

Abstract

The utility model belongs to the technical field of wind power generation, and relates to an in-situ capacity expansion reinforcing structure of a small-capacity wind power supporting structure. The structure comprises an FRP pipe and a newly-added tower drum. The FRP pipe covers the outer part of the original pure steel tower drum, and concrete is cast on site in an interlayer between the FRP pipe and the original pure steel tower drum to form an FRP-concrete-steel double-wall hollow combined tower drum; the newly-added tower drum is mounted at the upper part of the FRP-concrete-steel double-wall hollow combined tower drum; the newly-added tower drum is a prefabricated FRP-concrete-steel double-wall hollow combined tower drum or a pure steel tower drum. Compared with a traditional dismantling and rebuilding mode, an in-situ capacity expansion technology is adopted, an original wind power tower foundation and an original tower barrel structure are fully utilized, high cost of large-scale construction and equipment dismantling is avoided, and the construction period is greatly shortened. After capacity expansion and reinforcement, the hub height of the wind power tower can be remarkably increased, so that a wind turbine generator set can capture wind energy resources with higher altitude and higher wind speed, and the power generation efficiency of a wind power plant is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of wind power generation technology and relates to an in-situ expansion and reinforcement structure for small-capacity wind power support structures. Background Technology

[0002] In recent years, wind power technology has been undergoing an unprecedented wave of innovation. New large-capacity wind turbines have stood out in the global energy market due to their superior power generation efficiency, high operational stability, and significant economic advantages. In contrast, many wind turbines in early-built wind farms, equipped with smaller single-unit wind turbines, have gradually revealed a series of problems that urgently need to be addressed: power generation efficiency is insufficient to meet the growing energy demand, frequent equipment failures lead to high maintenance costs, and due to lagging technological iteration, wind energy resources cannot be fully utilized.

[0003] With increasingly scarce land resources, demolishing existing wind turbine towers and rebuilding them requires huge investments and involves lengthy construction periods, severely impacting the operational efficiency of wind farms. Against this backdrop, in-situ expansion and retrofitting technology has emerged. This innovative approach involves directly replacing existing wind turbine towers with larger capacity wind turbines, providing an effective way to improve the overall performance of wind farms, reducing construction costs, and significantly shortening project cycles.

[0004] However, in-situ expansion and renovation of wind turbine towers is no easy task and still faces many technical challenges. The greater loads and torques generated by new, larger-capacity turbines place higher demands on the load-bearing capacity of the original wind turbine tower structure. Whether the existing structure can withstand the mechanical challenges brought by the new equipment becomes crucial to the success of the expansion and renovation. Therefore, scientifically and rationally reinforcing the original wind turbine towers has become a core technical requirement for promoting the expansion and renovation of wind turbine towers, and it is related to the success or failure of the entire wind farm upgrade and renovation project. Utility Model Content

[0005] The purpose of this utility model is to provide an in-situ expansion and reinforcement structure for a small-capacity wind power support structure with an external FRP pipe. Through the optimization and evaluation of the original wind turbine tower structure and the design of a new structure, it achieves efficient and safe expansion and renovation, increases the hub height, improves the power generation efficiency and economic benefits of the wind farm, and reduces the risks and costs of renovation.

[0006] The technical solution provided by this utility model is: an in-situ expansion and reinforcement structure for small-capacity wind power support, including an FRP pipe and a newly added tower; the FRP pipe is wrapped around the outside of the original pure steel tower, and concrete is poured on-site between the FRP pipe and the original pure steel tower to form an FRP-concrete-steel double-wall hollow composite tower; the newly added tower is installed on the upper part of the FRP-concrete-steel double-wall hollow composite tower; the newly added tower is a prefabricated FRP-concrete-steel double-wall hollow composite tower or a pure steel tower.

[0007] Preferably, the FRP tube is any one of glass fiber tube, carbon fiber tube or aramid fiber tube; the outer surface of the FRP tube is coated with a coating with anti-ultraviolet or anti-corrosion functions.

[0008] Preferably, the concrete poured on site is any one of self-compacting concrete, ordinary concrete, lightweight aggregate concrete, mortar, or fiber-reinforced concrete.

[0009] Preferably, shear studs can be welded to the outside of the original pure steel tower to improve its interaction with concrete.

[0010] Preferably, the FRP-concrete-steel double-walled hollow tower and the newly installed tower on top of it are connected by high-strength bolts arranged at equal intervals along the circumference of the pipe section using annular flange plates welded to the original pure steel tower.

[0011] The beneficial effects of this utility model are:

[0012] (1) The FRP-concrete-steel double-wall hollow tower formed by this utility model has excellent performance: the outer FRP pipe has both high strength and lightweight characteristics, which can effectively resist environmental erosion and corrosion; the sandwich concrete and the inner steel tower work together to significantly improve the ultimate bearing capacity and bending stiffness of the structure, reduce the tower diameter required for expansion and renovation, reduce material costs, and is suitable for complex onshore climate conditions and high salt spray and strong corrosion environment at sea, greatly extending the service life of the wind power tower after expansion and reducing the later maintenance costs.

[0013] (2) Compared with the traditional method of demolition and reconstruction, this utility model adopts in-situ expansion technology, which makes full use of the original wind turbine foundation and tower structure, avoids the high cost of large-scale construction and equipment dismantling, and greatly shortens the construction period. After expansion and reinforcement, the hub height of the wind turbine can be significantly increased, enabling the wind turbine to capture wind energy resources at higher altitudes and with stronger wind speeds, thereby greatly improving the power generation efficiency of the wind farm. Attached Figure Description

[0014] Figure 1 A schematic diagram of the original (before in-situ expansion and renovation) small-capacity onshore wind power support structure;

[0015] Figure 2This is a schematic diagram of the support structure for large-capacity onshore wind power after in-situ expansion and modification in Example 1;

[0016] Figure 3 This is a schematic diagram of the AA section of the reinforced tower.

[0017] Figure 4 This is a schematic diagram of the original (before in-situ expansion and modification) small-capacity offshore wind power support structure in Example 2;

[0018] Figure 5 A schematic diagram of the support structure for the expanded and upgraded offshore wind power system;

[0019] In the diagram: 1- Original small-capacity wind turbine pure steel tower; 2- Original small-capacity wind turbine nacelle; 3- Original small-capacity wind turbine concrete foundation; 4- FRP pipe; 5- Concrete; 6- Newly added tower; 7- Original connecting flange; 8- Large-capacity wind turbine nacelle; 9- Shear stud; 10- Original pure steel foundation. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other. The described embodiments are merely some embodiments of the present utility model, not all embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0021] Example 1: This example provides a small-capacity onshore wind power support structure expansion and reinforcement structure, such as... Figure 2 As shown, it includes FRP pipe 4 and a newly added tower 6. FRP pipe 4 is wrapped around the exterior of the original small-capacity wind turbine pure steel tower 1. A cast-in-place concrete 5 is poured between FRP pipe 4 and the original small-capacity wind turbine pure steel tower 1, forming an FRP-concrete-steel double-walled hollow composite tower. Figure 3 As shown. The new tower 6 is installed on the upper part of the new FRP-concrete-steel double-wall hollow composite tower; the new tower 6 can be a prefabricated FRP-concrete-steel double-wall hollow composite tower or a pure steel tower.

[0022] The expansion and reinforcement structure of the small-capacity onshore wind power support structure in this embodiment was completed using the following method:

[0023] (1) Lifting the original small-capacity fan unit 2;

[0024] (2) Use drones to wash away impurities on the outer wall of the original small-capacity wind turbine pure steel tower 1, and use welding robots and other methods to weld shear studs 9 on the outer wall of the original small-capacity wind turbine pure steel tower 1, such as Figure 3 As shown;

[0025] (3) Install composite material FRP pipe 4 on the outside of the original small-capacity wind turbine pure steel tower 1, and pour concrete 5 on site between the FRP pipe and the original small-capacity wind turbine pure steel tower 1 to form an FRP-concrete-steel double-wall hollow composite tower, thereby improving the ultimate bearing capacity and stiffness of the tower.

[0026] (4) After the concrete 5 reaches its strength, a new tower 6 is hoisted on the upper part. The new tower 6 can be a prefabricated FRP-concrete-steel double-wall hollow composite tower or a pure steel tower to increase the overall support structure height.

[0027] (5) The newly added tower 6 and the original FRP-concrete-steel double-wall hollow composite tower formed after expansion and reinforcement are connected to the original connecting flange 7 of the nacelle through the top of the original tower;

[0028] (6) After all towers are connected, i.e. after reinforcement and height increase, the suitable large-capacity wind turbine nacelle 8 is hoisted to the top of the tower, and mechanical and electrical connections are completed with the new nacelle. The wind turbine is then put into operation and commissioned to verify the power generation, control system and other performance indicators, and to realize the capacity expansion and renovation.

[0029] Figure 2 The concrete 5 poured on-site can be any one of self-compacting concrete, ordinary concrete, lightweight aggregate concrete, mortar, or fiber-reinforced concrete. The FRP pipe 4 can be any one of glass fiber pipe, carbon fiber pipe, or aramid fiber pipe, and the outer surface of the FRP pipe 4 is coated with a special coating with UV resistance. The onshore wind power support structures before and after the modification are as follows: Figure 1 and Figure 2 As shown.

[0030] Example 2: This example provides a small-capacity offshore wind power support structure expansion and reinforcement structure. The method for modifying the tower above sea level is the same as the method for modifying the small-capacity onshore wind power expansion and reinforcement structure in Example 1; for reinforcing the original pure steel pipe foundation below sea level, the steps are as follows:

[0031] (1) First, position and hoist the FRP pipe 4 to the outside of the original pure steel pipe foundation 10, and penetrate it a certain distance below the mud surface;

[0032] (2) Using the cofferdam construction method, a cofferdam was built between the FRP pipe 4 and the original pure steel pipe foundation 10, and the internal seawater was pumped out to form a dry construction environment;

[0033] (3) Concrete 5 is poured in the gap between FRP pipe 4 and the original pure steel pipe foundation 10 to form an FRP-concrete-steel double-wall hollow foundation structure, thereby improving and reinforcing the foundation bearing capacity.

[0034] The offshore wind power support structures before and after the modification are as follows: Figure 4 and Figure 5 As shown.

[0035] The above embodiments make full use of the existing wind turbine foundations and tower structures, avoiding the high costs of large-scale construction and equipment dismantling, and significantly shortening the construction period. The expansion method can significantly increase the hub height of the wind turbine, enabling the wind turbine to capture wind energy resources at higher altitudes and with stronger wind speeds, thereby greatly improving the power generation efficiency of the wind farm.

Claims

1. An in-situ expansion and reinforcement structure for small-capacity wind power support, characterized in that: It includes FRP pipes and a new tower; the FRP pipes are wrapped around the outside of the original pure steel tower, and concrete is poured on site between the FRP pipes and the original pure steel tower to form an FRP-concrete-steel double-wall hollow composite tower; the new tower is installed on the upper part of the FRP-concrete-steel double-wall hollow composite tower; the new tower is a prefabricated FRP-concrete-steel double-wall hollow composite tower or a pure steel tower.

2. The small-capacity wind power support structure in-situ expansion and reinforcement structure according to claim 1, characterized in that: The FRP tube is any one of glass fiber tube, carbon fiber tube or aramid fiber tube; the outer surface of the FRP tube is coated with a coating with anti-ultraviolet or anti-corrosion function.

3. The small-capacity wind power support structure in-situ expansion and reinforcement structure according to claim 1, characterized in that: The concrete poured on site can be any one of the following: self-compacting concrete, ordinary concrete, lightweight aggregate concrete, mortar, or fiber-reinforced concrete.

4. The small-capacity wind power support structure in-situ expansion and reinforcement structure according to claim 1, characterized in that: The original pure steel tower was welded with shear studs to improve its interaction with the concrete.

5. The in-situ capacity expansion and reinforcement structure of small-capacity wind power support structure according to any one of claims 1-4, characterized in that: The FRP-concrete-steel double-walled hollow tower and the newly installed tower on top of it are connected by high-strength bolts arranged at equal intervals along the circumference of the pipe section, using annular flange plates welded to the original pure steel tower.

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