Ultra high performance concrete pipe photovoltaic support

Abstract

This invention discloses an ultra-high performance concrete tube photovoltaic support, belonging to the field of structural engineering technology. The ultra-high performance concrete tube photovoltaic support comprises an ultra-high performance concrete main beam, a high performance concrete tube, a prestressed tensioning plate, and tie rods; the high performance concrete tube and the prestressed tensioning plate form a prestressed high performance concrete tube. The end of the high performance concrete tube is connected to the ultra-high performance concrete main beam; embedded parts are provided on the side of the high performance concrete tube; the embedded parts are connected to the tie rods through sleeves; the prestressed tensioning plates are uniformly arranged along the inner wall of the high performance concrete tube. The ultra-high performance concrete tube photovoltaic support proposed in this invention can fully utilize the excellent compressive strength of ultra-high performance concrete and the excellent tensile strength of fiber-reinforced composite materials; it has superior structural strength and stability, strong durability and corrosion resistance, a high degree of assembly, and convenient construction and transportation.

Description

Technical Field

[0001] This invention relates to an ultra-high performance concrete tube photovoltaic support, belonging to the field of structural engineering technology. Background Technology

[0002] With the transformation of the global energy structure, the development of clean energy has become the core of national energy strategies. Seeking development, space, and resources from the ocean has become a significant trend and direction for global energy development. Marine renewable energy, such as offshore wind, tidal, and wave energy, is gradually becoming a key source of future energy. my country possesses over 18,000 kilometers of coastline and a vast maritime territory, covering approximately 4.73 million square kilometers, nearly half of its land area, containing abundant renewable resources such as wind, solar, wave, tidal, and ocean current energy. In recent years, guided by the national dual-carbon goals, photovoltaic power generation, as an important component of my country's renewable energy, has received widespread attention and rapid development. Simultaneously, constrained by onshore land resources, offshore photovoltaic power generation, due to its unique spatial advantages, is gradually becoming an important development direction for photovoltaic power generation.

[0003] However, the construction and operation of offshore photovoltaic (PV) power plants face a series of challenges. Compared to onshore PV, the environmental conditions at sea are more complex, and the PV support structures need to withstand more severe natural forces, such as wind loads, wave impacts, tidal fluctuations, and salt spray corrosion. These factors not only require PV support structures to have stronger structural strength and stability but also place higher demands on their durability. Currently, offshore PV platforms generally use steel structure systems. However, steel is easily corroded by high salt and high humidity in the marine environment, leading to severe corrosion and damage to the steel structure, thus shortening the service life of the PV support structures. In addition, while existing anti-corrosion coatings and cathodic protection can slow down the corrosion process to some extent, they cannot guarantee long-term effectiveness and increase construction and maintenance costs. Summary of the Invention

[0004] In view of the above problems, it is necessary to design a new type of photovoltaic support structure that can effectively cope with the complex marine environment of strong corrosion and variable climate, reduce or even avoid structural corrosion problems. This invention provides an ultra-high performance concrete pipe photovoltaic support that ensures that the structure has good load-bearing capacity and durability, thereby improving the long-term stability of marine photovoltaic support structures.

[0005] To effectively cope with the complex and harsh environment of marine conditions characterized by strong corrosiveness and variable climate, this invention proposes an ultra-high performance concrete tube photovoltaic support structure, suitable for offshore photovoltaic platform structures. The ultra-high performance concrete tube photovoltaic support structure consists of an ultra-high performance concrete main beam, a high performance concrete tube, a prestressed tension plate, and tie rods.

[0006] A high-performance concrete tube photovoltaic support, characterized in that it comprises: Ultra-high performance concrete main beam; An ultra-high performance concrete pipe is fixed to the ultra-high performance concrete main beam; embedded parts are provided on the side of the ultra-high performance concrete pipe; The tie rod connected to the embedded part; A prestressed tensioning plate tightly attached to the inside of the ultra-high performance concrete tube; The ultra-high performance concrete pipe and the prestressed tensioning plate form a prestressed concrete pipe.

[0007] The ultra-high performance concrete refers to concrete that meets the requirements of the new national standard GB / T 31387—2025, which specifies a compressive strength of ≥100MPa and a tensile strength of ≥3.5MPa.

[0008] The ultra-high performance concrete tube photovoltaic support proposed in this invention can make full use of the excellent compressive strength of ultra-high performance concrete and the outstanding tensile strength of fiber-reinforced composite materials; it has superior structural strength and stability, strong durability and corrosion resistance, high degree of assembly, and convenient construction and transportation.

[0009] The end of the high-performance concrete pipe is connected to the ultra-high-performance concrete main beam. The connection method can be wet joint connection, steel sleeve grouting connection or embedded part connection.

[0010] Furthermore, the high-performance concrete pipe has a hollow rectangular cross-section and is prefabricated in the factory; embedded parts are provided on the side of the high-performance concrete pipe.

[0011] The prestressed tensioning plate is made of fiber-reinforced composite material; after prestressing, the prestressed tensioning plate is tightly attached to the inner side of the high-performance concrete pipe. Furthermore, the prestressed tensioning plates are uniformly arranged along the entire length of the inner wall of the high-performance concrete pipe.

[0012] The high-performance concrete pipe and the prestressed tensioning plate form a prestressed high-performance concrete pipe.

[0013] The top surface of the ultra-high performance concrete pipe is the first side surface, and the second side surface, the third side surface, and the fourth side surface are arranged in a clockwise direction. The embedded parts are arranged on the second side surface and the fourth side surface of the ultra-high performance concrete pipe and are evenly distributed along the length of the ultra-high performance concrete pipe.

[0014] The two adjacent ultra-high performance concrete pipes are connected to the embedded parts by the tie rod.

[0015] The tie rod is connected to the embedded part, and the two are connected by a sleeve.

[0016] The ultra-high performance concrete tube photovoltaic support proposed in this invention uses ultra-high performance concrete instead of steel and applies prestress to the main components, which has the following advantages: (1) Excellent corrosion resistance and durability. Using ultra-high performance concrete as the main material of photovoltaic support effectively improves the corrosion resistance of the structure. Compared with traditional steel structures, ultra-high performance concrete tube photovoltaic support has superior resistance to salt spray and moisture in marine environments, effectively preventing corrosion problems caused by salt and moisture in marine environments, thereby significantly improving the service life of photovoltaic support.

[0017] (2) Superior structural strength and stability. The design of high-performance concrete pipe combined with prestressed tension plate provides higher compressive and flexural strength than ordinary concrete, enhances the overall load-bearing capacity and deformation resistance of the structure, makes the structure more stable when subjected to external loads, and can effectively resist dynamic loads in complex marine environments, thereby improving the load-bearing and stability performance of the support.

[0018] (3) High material utilization efficiency. The high-performance concrete pipe is cast from high-performance concrete and has superior compressive strength; the prestressed tension plate is made of fiber-reinforced composite material and has superior tensile strength; combining the two can effectively give full play to the performance advantages of each material and achieve the effect of "1+1>2", thereby improving the overall performance of the structure.

[0019] (4) High degree of prefabrication and convenient construction. Both the ultra-high performance concrete main beam and the high performance concrete pipe can be prefabricated in the factory, with a high degree of prefabrication, which ensures the high precision and high quality of each component; on-site construction only requires simple assembly and connection, which can effectively reduce the input of labor and equipment and greatly shorten the construction period. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an ultra-high performance concrete tube photovoltaic support provided in an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of a high-performance concrete pipe.

[0022] Figure 3 A schematic diagram of a prestressed high-performance concrete pipe formed by a prestressed tensioning plate and a high-performance concrete pipe. Detailed Implementation

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] Appendix Figures 1 to 3 The accompanying figure labels are as follows: 1. Ultra-high performance concrete main beam; 2. High performance concrete pipe; 3. Prestressed tension plate; 4. Tie rod; 5. Embedded parts; 6. High performance concrete pipe section; 7. First side; 8. Second side.

[0025] like Figure 1 As shown, a photovoltaic support structure made of ultra-high performance concrete tube consists of an ultra-high performance concrete main beam 1, an ultra-high performance concrete tube 2, a prestressed tension plate 3, and tie rods 4. The ultra-high performance concrete tube 2 is connected to the ultra-high performance concrete main beam 1 at its end, and the connection method can be wet joint connection, steel bar sleeve grouting connection, or pre-embedded part connection.

[0026] like Figure 2 As shown, the ultra-high performance concrete pipe 2 has a hollow rectangular cross-section and is prefabricated in the factory. Embedded parts 5 are installed on the side of the high-performance concrete pipe. When the length of the ultra-high performance concrete pipe 2 is too large, it can be prefabricated in sections. High-performance concrete pipe sections 6 are also prefabricated in the factory and sequentially spliced ​​along the axial direction on site. After splicing, a prestressed tension plate 3 is used for axial connection. Sectional prefabrication allows for flexible adjustment of the length of the high-performance concrete pipe according to actual needs, facilitating transportation and on-site assembly, and reducing transportation costs. Furthermore, since most of the prefabrication is completed in the factory, it not only improves the quality control of the high-performance concrete pipe but also reduces dependence on construction technology and environment during on-site installation, further improving the accuracy and reliability of construction. Therefore, in practical applications, it can be determined whether the ultra-high performance concrete pipe 2 should be prefabricated in sections, and the number of high-performance concrete pipe sections 6 can be determined according to needs. The embedded parts 5 are mainly used to connect the tie rods 4, and the two can be connected by sleeves. Therefore, the embedded part 5 is arranged outside the first side 7 and the second side 8 of the ultra-high performance concrete pipe 2, and is evenly arranged along the length of the ultra-high performance concrete pipe 2.

[0027] like Figure 3 As shown, the prestressed tensioning plate 3 is made of fiber-reinforced composite material. After prestressing, the prestressed tensioning plate 3 is tightly attached to the inner side of the ultra-high performance concrete pipe 2. Fiber-reinforced composite material has extremely high tensile strength, is lightweight, and corrosion-resistant, effectively resisting erosion from salt spray and moisture in marine environments. Using fiber-reinforced composite material to manufacture the prestressed tensioning plate not only fully utilizes the material's excellent tensile properties but also improves the long-term stability of the prestress. Furthermore, the prestressed tensioning plate can axially connect segmented prefabricated high-performance concrete pipes, achieving high connection efficiency and avoiding on-site wet work. The applied prestress can prevent cracking of the high-performance concrete pipe, improving the service life of the structure. Therefore, preferably, the prestressed tensioning plates 3 are arranged longitudinally and at intervals along the inner side of the ultra-high performance concrete pipe 2 to ensure the fixing effect and the uniformity of stress on the high-performance concrete pipe.

[0028] To illustrate the stress mechanism and mechanical properties of the ultra-high performance concrete (UHVPC) tube photovoltaic (PV) support system, a specific embodiment is used for calculation. In this example, the overall dimensions of the UHVPC tube PV support system are 30m × 30m. It consists of two UHVPC main beams, spaced 18m apart, with a hollow rectangular cross-section measuring 430 × 665mm, a flange thickness of 100mm, and a web thickness of 50mm. The support points of the main beams are located at the 1 / 4 and 3 / 4 positions of the beam. Five UHVPC tubes are arranged, spaced 7.5m apart, with a hollow rectangular cross-section measuring 340 × 500mm, a flange thickness of 65mm, and a web thickness of 50mm. The prestressed tension plate is 30mm wide and 3mm thick. The tie rod has a circular cross-section with a diameter of 10mm. The load on the UHVPC tube PV support system is assumed to be 2kN / m. 2 Consideration can be given to optimizing the structure by adjusting the relative dimensions of the ultra-high performance concrete (UHVPC) main beam and the UHVPC tube. In this embodiment, under load, the maximum normal stress of the UHVPC main beam occurs near the support point, with a stress ratio of 0.87; the maximum deflection occurs at the end, at 1 / 259. The maximum normal stress and maximum deflection of the UHVPC tube both occur near the mid-span, with a stress ratio of 0.65 and a deflection of 1 / 250. This indicates that the UHVPC tube photovoltaic support exhibits good load-bearing performance.

Claims

1. A high-performance concrete tube photovoltaic support, characterized in that, include: Ultra-high performance concrete main beam; An ultra-high performance concrete pipe is fixed to the ultra-high performance concrete main beam; embedded parts are provided on the side of the ultra-high performance concrete pipe; The tie rod connected to the embedded part; A prestressed tensioning plate tightly attached to the inside of the ultra-high performance concrete tube; The ultra-high performance concrete pipe and the prestressed tensioning plate form a prestressed concrete pipe.

2. The ultra-high performance concrete tube photovoltaic support according to claim 1, characterized in that, The ultra-high performance concrete refers to concrete that meets the requirements of the new national standard GB / T 31387—2025, which specifies a compressive strength ≥100MPa and a tensile strength ≥3.5MPa.

3. The ultra-high performance concrete tube photovoltaic support according to claim 1, characterized in that, The connection between the ultra-high performance concrete main beam and the ultra-high performance concrete pipe is achieved by wet joint connection, grouting connection with steel sleeve, or connection with embedded parts.

4. The ultra-high performance concrete tube photovoltaic support according to claim 1, characterized in that, The ultra-high performance concrete pipe has a hollow rectangular cross-section and is prefabricated in a factory using ultra-high performance concrete.

5. The ultra-high performance concrete tube photovoltaic support according to claim 1, characterized in that, The prestressed tension plate is made of fiber-reinforced composite material.

6. The ultra-high performance concrete tube photovoltaic support according to claim 1, characterized in that, The prestressed tensioning plate is tightly attached to the inner side of the ultra-high performance concrete pipe after prestressing. The prestressed tensioning plates are uniformly arranged along the entire length of the inner wall of the ultra-high performance concrete pipe.

7. The ultra-high performance concrete tube photovoltaic support according to claim 1, characterized in that, The top surface of the ultra-high performance concrete pipe is the first side surface, and the second side surface, the third side surface, and the fourth side surface are arranged in a clockwise direction. The embedded parts are arranged on the second and fourth sides of the ultra-high performance concrete pipe and are evenly distributed along the length of the ultra-high performance concrete pipe.

8. The ultra-high performance concrete tube photovoltaic support according to claim 1, characterized in that, The two adjacent ultra-high performance concrete pipes are connected to the embedded parts by the tie rod.

9. The ultra-high performance concrete tube photovoltaic support according to claim 1, characterized in that, The tie rod is connected to the embedded part via a sleeve.

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