Prestressed concrete wind power generation tower structure

Abstract

A prestressed concrete wind power generation tower structure comprises a foundation, a tower drum and prestressed cables. The cylinder section is of a double-layer prestressed concrete structure and comprises an inner cylinder layer and an outer cylinder layer. Vertical prestressed reinforcements and circumferential prestressed reinforcements are arranged in the concrete of the inner cylinder layer; the outer cylinder layer is internally provided with an externally-wrapped prestressed steel cable for circumferential reinforcement; the vertically adjacent cylinder sections are connected through a sliding sleeve; the sliding sleeve comprises an outer sleeve and an inner sleeve; the outer sleeve is fixed at the top or the bottom of the sleeve on one side of the joint; the inner sleeve is connected to the corresponding position of the sleeve on the other side of the joint, the inner sleeve is inserted into the corresponding outer sleeve, and a relative sliding space is reserved between the inner sleeve and the outer sleeve; a sliding layer is arranged in a relative sliding space between the inner sleeve and the outer sleeve; and the prestressed cable penetrates through the plurality of cylinder sections, and the plurality of cylinder sections are subjected to prestressed pulling. The technical problems that a traditional wind power generation tower structure is large in weight, difficult to transport, inconvenient to construct and high in later maintenance cost are solved.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation tower structure technology, and in particular to a prestressed concrete wind power generation tower structure, which aims to improve the strength, stability and durability of wind power generation towers, while reducing manufacturing and maintenance costs, and adapting to application needs under different wind speeds and environmental conditions. Background Technology

[0002] With the development of renewable energy, wind power has become one of the important clean energy sources. Wind turbine towers, as their core structure, play a crucial role in support and stability. Traditional wind turbine towers are mostly made of steel or steel-integrated materials, which are prone to fatigue damage and corrosion under high wind speeds and harsh weather conditions, especially in offshore and coastal wind farms. Steel-structured wind turbine towers typically require higher maintenance costs, and their heavy weight and transportation difficulties limit their application in remote areas.

[0003] Therefore, how to reduce maintenance costs, extend service life, and improve wind resistance and corrosion resistance of towers while ensuring tower strength and stability is a key challenge in current wind power tower design. Utility Model Content

[0004] The purpose of this utility model is to provide a prestressed concrete wind power generation tower structure to solve the technical problems of traditional wind power generation tower structures, such as large weight, difficult transportation, inconvenient construction, and high maintenance costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A prestressed concrete wind turbine tower structure includes a foundation and a tower; the tower is connected to the top of the foundation and is composed of multiple vertically spliced ​​sections; its key feature is that it also includes prestressed cables; the sections adopt a double-layer prestressed concrete structure, namely an inner cylinder layer and an outer cylinder layer; vertical prestressed steel bars and circumferential prestressed steel bars are arranged in the concrete of the inner cylinder layer to improve the tower's load-bearing capacity and bending resistance; the outer cylinder layer is located outside the inner cylinder layer, and is reinforced with externally wrapped prestressed steel cables for circumferential reinforcement; vertically adjacent sections are connected by sliding sleeves; The sliding sleeve includes an outer sleeve and an inner sleeve; the outer sleeve is fixed to the top or bottom of the sleeve on one side of the joint, and the end of the outer sleeve does not extend beyond the sleeve on the corresponding side; the inner sleeve is connected to the corresponding position of the sleeve on the other side of the joint, and the end of the inner sleeve extends beyond the sleeve on the corresponding side; the extended part of the inner sleeve is inserted into the corresponding outer sleeve, leaving a relative sliding space between the inner and outer sleeves; a sliding layer is provided in the relative sliding space between the inner and outer sleeves; there is a set of prestressing cables arranged circumferentially; the prestressing cables pass through multiple cylinder segments, and the multiple cylinder segments are prestressed together.

[0007] Preferably, both the outer and inner surfaces of the tower are coated with an anti-corrosion layer.

[0008] Preferably, the cylindrical section has a pre-embedded guide pipe for prestressed cables, and the prestressed cables pass through the corresponding guide pipes to tie all the cylindrical sections together.

[0009] Preferably, an inclination sensor and a temperature sensor are installed inside the tower; the inclination sensors are arranged at vertical intervals; stress sensors are installed at circumferential intervals at the joints of adjacent tower sections; the sensor data is transmitted to the on-site data acquisition unit, which transmits the data to the remote monitoring center in real time, facilitating remote diagnosis and early warning by maintenance personnel.

[0010] Preferably, the sliding layer is a polytetrafluoroethylene layer or a polyurethane layer.

[0011] Preferably, a sealing layer is provided at the joint between adjacent cylinder sections, and the sealing layer is made of rubber or polyurethane gasket.

[0012] Preferably, a connecting seat is provided at the bottom of the tower; the bottom diameter of the connecting seat is larger than the top diameter; an installation groove is provided at the top of the foundation, the shape of the installation groove is adapted to the shape of the connecting seat, and the connecting seat is embedded in the installation groove; the lower end of the prestressed cable passes through the top surface of the foundation and the connecting seat, and is anchored at the bottom of the connecting seat.

[0013] Compared with the prior art, the present invention has the following features and beneficial effects.

[0014] 1. This utility model proposes a prestressed concrete wind turbine tower structure. Through a reasonable prestressed concrete design, this structure can provide higher wind resistance, stronger stability and durability than traditional steel structures, while reducing transportation, construction and maintenance costs. This structure can effectively improve the overall performance of wind turbine towers, and is especially suitable for areas with high wind speeds and harsh environments. It also has strong transportation adaptability and ease of construction, and has good market prospects and application value.

[0015] 2. The prestressed concrete wind turbine tower structure of this utility model improves strength and stability: Through the rational arrangement of prestressing tendons, the prestressed concrete tower enhances its wind and earthquake resistance, improving overall stability and making it particularly suitable for wind power generation applications in high-wind-speed areas. Simultaneously, due to the modular design and prestressed concrete materials, this tower structure significantly reduces manufacturing and transportation costs. Compared to traditional steel structure towers, prestressed concrete towers have lower manufacturing and maintenance costs, and are lighter during transportation, meeting the transportation requirements of remote areas. Furthermore, prestressed concrete towers have strong corrosion resistance, making them particularly suitable for offshore and coastal wind farms. They can resist the erosion of seawater, moisture, and salt spray, extending the tower's service life and reducing maintenance frequency and costs. Due to the use of prestressed concrete and modular design, the tower installation process is simple and efficient, and subsequent maintenance and repair are also more convenient, reducing the operating costs of wind farms.

[0016] 3. To accommodate potential thermal expansion and contraction and wind-induced deformation of the tower, this invention employs a sliding fit design for the connection between adjacent cylinder sections. This design allows for slight displacement at the connection point within a certain range, thereby reducing local stress concentration caused by external loads and increasing the structure's fatigue resistance. Sliding sleeve connection: The connection surface of each cylinder section is designed as a sliding fit joint, with one part using inner and outer sleeves and the other part using sliding materials (such as sliding pads). The connection is fixed through friction and prestress. The sliding design facilitates fine-tuning of the relative positions between cylinder sections, avoiding stress concentration that may result from rigid connections. Simultaneously, adjacent cylinder sections are connected by prestressed cables, applying tension during installation to ensure a tight fit between the sections and effectively transfer vertical and lateral loads between the upper and lower cylinder sections.

[0017] 4. The tower of this utility model adopts a double-layer prestressed concrete structure, namely an inner cylinder layer and an outer cylinder layer. Vertical prestressed steel bars and circumferential prestressed steel bars are arranged in the concrete of the inner cylinder layer to improve the load-bearing capacity and bending resistance of the tower. The outer cylinder layer is located outside the inner cylinder layer. The concrete layer of the outer cylinder layer is made of high-strength steel fiber reinforced concrete, and the outer cylinder layer is reinforced with external prestressed steel cables. This double-layer structure effectively enhances the wind load resistance of the tower while reducing the structural self-weight.

[0018] 5. This invention, by introducing intelligent sensors and an automatic prestressing adjustment system, can monitor stress changes at the connection points of the tower sections in real time and automatically adjust the tension of the prestressing tendons according to load changes, thereby ensuring the long-term stability of the tower connection. Intelligent sensors are pre-embedded at the connection points, and these sensors can monitor parameters such as tension, displacement, and temperature at the connection points in real time. Through wireless communication technology, the sensors transmit data to the tower's monitoring system. When excessive stress is detected at a connection point, the system can automatically adjust the tension of the prestressing tendons to maintain the optimal stress state at the connection point. This intelligent connection method can effectively cope with the dynamic effects of wind speed changes, temperature fluctuations, and other environmental factors on the tower connection points, improving the tower's adaptability and reliability.

[0019] 6. This utility model's prestressed anchoring system firmly connects the wind tower and foundation by setting prestressed steel bars or cables, and further enhances the stability and load-bearing capacity of the connection by applying prestress; it also strengthens the bond between the foundation and the tower body. The prestress effectively disperses the wind tower load, reducing the risk of foundation settlement and tower tilting. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the prestressed concrete wind power generation tower structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the basic structure of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure before adjacent cylinder sections are connected in this utility model.

[0024] Figure 4 This is a schematic diagram of the horizontal cross-section of the sliding sleeve in this utility model.

[0025] Figure 5 This is a schematic diagram of the horizontal cross-sectional structure of the middle section of this utility model.

[0026] Reference numerals in the attached drawings: 1 - Foundation, 2 - Tower, 2.1 - Segment, 2.1.1 - Inner cylinder layer, 2.1.2 - Outer cylinder layer, 3 - Prestressed cable, 4 - Outer sleeve, 5 - Inner sleeve, 6 - Sliding layer, 7 - Anti-corrosion layer, 8 - Guide pipe, 9 - Tilt sensor, 10 - Temperature sensor, 11 - Stress sensor, 12 - Connecting seat, 13 - Mounting groove. Detailed Implementation

[0027] like Figure 1-5 As shown, this prestressed concrete wind turbine tower structure includes a foundation 1 and a tower 2. The tower 2 is connected to the top of the foundation 1 and is composed of multiple segments 2.1 vertically spliced ​​together. To reduce the difficulty of transporting the tower, a modular design is adopted, and the length and diameter of each tower segment 2.1 are reasonably controlled to facilitate transportation to the wind farm site by land or water. The tower 2 modules are assembled on-site, greatly improving construction efficiency. The prestressed concrete wind turbine tower structure also includes prestressed cables 3. The segment 2.1 adopts a double-layer prestressed concrete structure, namely an inner cylinder layer 2.1.1 and an outer cylinder layer 2.1.2. Vertical prestressed steel bars and circumferential prestressed steel bars are arranged in the concrete of the inner cylinder layer 2.1.1 to improve the load-bearing capacity and bending resistance of the tower. The outer cylinder layer 2.1.2 is located outside the inner cylinder layer 2.1.1, and the concrete layer of the outer cylinder layer 2.1.2 is made of... High-strength steel fiber reinforced concrete is used, and the outer cylinder layer 2.1.2 is reinforced circumferentially with externally wrapped prestressed steel cables. This double-layer structure effectively enhances the tower's wind load resistance while reducing its self-weight. Vertically adjacent cylinder segments 2.1 are connected by sliding sleeves. The sliding sleeve includes an outer sleeve 4 and an inner sleeve 5. The outer sleeve 4 is fixed to the top or bottom of the sleeve on one side of the joint, and the end of the outer sleeve 4 does not extend beyond the corresponding sleeve. The inner sleeve 5 is connected to the corresponding position of the sleeve on the other side of the joint, and the end of the inner sleeve 5 extends beyond the corresponding sleeve. The extended part of the inner sleeve 5 is inserted into the corresponding outer sleeve 4, leaving a relative sliding space between the inner and outer sleeves. A sliding layer 6 is provided in the relative sliding space between the inner and outer sleeves. There is a set of prestressed cables 3, arranged circumferentially. The prestressed cables 3 pass through multiple cylinder segments 2.1, prestressing and connecting the multiple cylinder segments 2.1. This prestressed concrete wind turbine tower structure employs a simple assembly method, reducing the labor intensity of construction workers. The application of prestressing tendons is completed through automated equipment, ensuring that the prestress of each tower section meets design requirements, thus reducing human error and construction risks. The tower design considers ease of future maintenance, with internal ladders and maintenance platforms for easy access and regular inspection and upkeep.

[0028] In this embodiment, the outer and inner surfaces of the tower 2 are coated with an anti-corrosion layer 7, and the interior of the tower 2 uses corrosion-resistant steel bars and connectors to ensure that the tower 2 is not easily corroded by rainwater and moisture during long-term use.

[0029] In this embodiment, pre-embedded guide pipes 8 for prestressed cables 3 are embedded in the cylindrical section 2.1. The prestressed cables 3 pass through the corresponding guide pipes 8, and prestress is applied by tensioning to connect all the cylindrical sections 2.1. This structure makes the overall stress distribution of the ventilation duct structure more reasonable and uniform.

[0030] In this embodiment, tilt sensors 9 and temperature sensors 10 are installed on the inner side of the tower 2; the tilt sensors 9 are arranged at vertical intervals; stress sensors 11 are installed at circumferential intervals at the joints of adjacent tower sections 2.1; the sensor data is transmitted to a field data acquisition unit, which transmits the data to a remote monitoring center in real time, facilitating remote diagnosis and early warning by maintenance personnel. The intelligent sensor network can monitor important parameters such as tower tilt, stress, and temperature in real time. Through IoT technology, the data is transmitted to a remote monitoring center in real time, facilitating remote diagnosis and early warning by maintenance personnel. This system can significantly improve the maintenance efficiency of wind power towers and avoid production downtime due to sudden failures.

[0031] In this embodiment, the sliding layer 6 is a polytetrafluoroethylene (PTFE) layer or a polyurethane layer.

[0032] In this embodiment, considering that wind power towers are often located in harsh environments, the joints of the cylindrical sections 2.1 need to have good sealing properties to prevent water and moisture from penetrating into the tower and to avoid steel corrosion or concrete freeze-thaw damage. A sealing layer is provided at the joints of adjacent cylindrical sections 2.1. The sealing layer uses rubber or polyurethane gaskets to prevent rainwater or moisture from penetrating into the tower, thereby increasing the structure's corrosion resistance and service life.

[0033] In this embodiment, a connecting seat 12 is provided at the bottom of the tower 2; the connecting seat 12 includes an upper section and a lower section; the horizontal cross-sections of the upper and lower sections are circular, and the diameter of the lower section is larger than the diameter of the upper section; an installation groove 13 is provided at the top of the foundation 1, the installation groove 13 includes an upper section and a lower section, and the diameter of the lower section is larger than the diameter of the upper section; the connecting seat 12 is embedded in the installation groove 13; the lower end of the prestressed cable 3 passes through the top surface of the foundation 1 and the connecting seat 12, and is anchored to the bottom of the connecting seat 12.

[0034] In this embodiment, the concrete for tower 2, by weight, comprises 670-700 parts cement, 80-100 parts microsphere mineral powder, 80-100 parts fly ash, 100-130 parts silica fume, 730-760 parts lightweight aggregate, 150-165 parts water, and 29.0-33.0 parts admixtures. The lightweight aggregate is selected from coal gangue ceramsite (a product of coal-related solid waste, after crushing, grinding, aging, granulation, and high-temperature calcination at 1200℃) to replace traditional coarse and fine aggregates, reducing the concrete density; the apparent density of the lightweight aggregate is 1780 kg / m³, and the water absorption rate is 10%. P·II 52.5 high-strength cement and admixtures (glass microspheres, mineral powder S95, and silica fume SF90) are used to improve the strength and durability of the concrete.

[0035] The concrete contains added fibers, specifically copper-plated steel fibers with an aspect ratio of 60-90, an equivalent diameter of 0.18-0.22, a length of 6 mm, and a tensile strength >2850 MPa. The admixtures include polycarboxylate superplasticizer masterbatch, polycarboxylate slump-retaining masterbatch, a self-developed special viscosity-reducing masterbatch, a sacrificial agent (coating the surface of lightweight aggregate to reduce admixture adsorption by the lightweight aggregate), and water. The weight ratio of polycarboxylate superplasticizer masterbatch: polycarboxylate slump-retaining masterbatch: self-developed special viscosity-reducing masterbatch: sacrificial agent: water is (1.7-2.0):(1.7-2.0):(1.7-2.0):(1.0-1.5):(3.5-3.9).

[0036] The concrete construction process for the tower is as follows:

[0037] 1. Pre-wetting treatment of lightweight aggregates.

[0038] 2. First, pour the lightweight aggregate into the mixing pot, then pour in the powder and pre-mix for 1 minute. Then add water and admixtures, and the proportion of steel fiber added. After mixing is complete, add the admixtures while mixing, and evenly spread them on the concrete. After adding the steel fiber, continue mixing for 2 minutes. Remove the mixture from the mixing pot according to the state, and conduct work performance tests and form test blocks.

[0039] The performance tests of the molded test blocks are shown in the table below:

[0040]

[0041] The measured concrete density is 2100 kg / m³. 3 It belongs to the category of lightweight concrete, with a weight of 2550 kg / m³ compared to conventional C80 concrete. 3The weight is reduced by 450 kg per unit area, resulting in economic benefits for hoisting and transportation. The reduced weight also lowers the requirements for the tower foundation. The incorporation of steel fibers improves toughness, reduces the risk of cracking, and enhances the wind resistance of ultra-high wind towers. The lightweight aggregate, after saturation and water absorption, possesses self-curing properties, effectively controlling performance degradation caused by concrete water loss in high wind speed areas. The introduction of glass microspheres improves the concrete's corrosion resistance and enhances its durability. In summary, the lightweight, high-strength concrete provided by this invention is suitable for precast segments of wind turbine towers, possessing good practical value and market prospects, and is of great significance for promoting the development of the wind energy industry.

[0042] These innovative solutions focus on improving the efficiency, stability, and economy of the connection between wind turbine towers and foundations. From intelligent and adaptive design to the application of materials science, they bring more possibilities to the wind power industry. These innovations not only improve the performance of wind turbine towers but also reduce construction and operation and maintenance costs, and provide more solutions to address future wind power technology development and environmental changes.

[0043] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments may also exist. The purpose of the above embodiments is to illustrate the present utility model, rather than to limit the protection scope of the present utility model. All applications derived from simple variations of the present utility model fall within the protection scope of the present utility model.

Claims

1. A prestressed concrete wind power generation tower structure, comprising a foundation (1) and a tower (2); the tower (2) is connected to the top of the foundation (1) and is formed by vertically splicing multiple cylindrical segments (2.1); characterized in that: It also includes prestressed cables (3); the cylinder section (2.1) adopts a double-layer prestressed concrete structure, namely an inner cylinder layer (2.1.1) and an outer cylinder layer (2.1.2); vertical prestressed steel bars and circumferential prestressed steel bars are arranged in the concrete of the inner cylinder layer (2.1.1) to improve the load-bearing capacity and bending resistance of the tower; the outer cylinder layer (2.1.2) is located outside the inner cylinder layer (2.1.1), and the outer cylinder layer ( 2.1.2) is equipped with an outer prestressed steel cable for circumferential reinforcement; vertically adjacent cylinder segments (2.1) are connected by a sliding sleeve; the sliding sleeve includes an outer sleeve (4) and an inner sleeve (5); the outer sleeve (4) is fixed to the top or bottom of the sleeve on one side of the joint, and the end of the outer sleeve (4) does not extend beyond the sleeve on the corresponding side; the inner sleeve (5) is connected to the corresponding position of the sleeve on the other side of the joint, and the end of the inner sleeve (5) extends beyond the sleeve on the corresponding side; the extended part of the inner sleeve (5) is inserted into the corresponding outer sleeve (4), and a relative sliding space is left between the inner and outer sleeves; a sliding layer (6) is set in the relative sliding space between the inner and outer sleeves; there is a set of prestressed cables (3), which are arranged circumferentially; the prestressed cables (3) pass through multiple cylinder segments (2.1) and prestress the multiple cylinder segments (2.1) together.

2. The prestressed concrete wind turbine tower structure according to claim 1, characterized in that: The outer and inner surfaces of the tower (2) are coated with an anti-corrosion layer (7).

3. The prestressed concrete wind turbine tower structure according to claim 1, characterized in that: The prestressed cable (3) is pre-embedded in the cylindrical section (2.1) and the prestressed cable (3) passes through the corresponding guide pipe (8) to tie all the cylindrical sections (2.1).

4. The prestressed concrete wind turbine tower structure according to claim 1, characterized in that: An inclination sensor (9) and a temperature sensor (10) are installed inside the tower (2); the inclination sensor (9) is arranged at vertical intervals; stress sensors (11) are installed at circumferential intervals at the joints of adjacent tower sections (2.1); the sensor data is transmitted to the on-site data acquisition device, and the data acquisition device transmits the data to the remote monitoring center in real time, so as to facilitate remote diagnosis and early warning by operation and maintenance personnel.

5. The prestressed concrete wind turbine tower structure according to claim 1, characterized in that: The sliding layer (6) is made of polytetrafluoroethylene (PTFE) or polyurethane.

6. The prestressed concrete wind turbine tower structure according to claim 1, characterized in that: A sealing layer is provided at the joint of adjacent cylinder sections (2.1). The sealing layer is made of rubber or polyurethane gaskets to prevent rainwater or moisture from penetrating into the tower and to increase the corrosion resistance and service life of the structure.

7. The prestressed concrete wind power generation tower structure according to claim 1, characterized in that: The bottom of the tower (2) is provided with a connecting seat (12); the bottom diameter of the connecting seat (12) is larger than the top diameter; an installation groove (13) is provided on the top of the foundation (1), the shape of the installation groove (13) is adapted to the shape of the connecting seat (12); the connecting seat (12) is embedded in the installation groove (13); the lower end of the prestressed cable (3) passes through the top surface of the foundation (1) and the connecting seat (12), and is anchored to the bottom of the connecting seat (12).

Images