Semi-floating type super-large-span string arc-shaped truss platform suitable for offshore floating type photovoltaic power station

Abstract

The invention discloses a semi-floating type ultra-large-span string arc truss platform suitable for an offshore floating type photovoltaic power station. The semi-floating type ultra-large-span string arc truss platform is characterized by comprising an ultra-large-span string arc truss, a middle circular steel platform, a top annular inhaul cable, a bottom annular reinforcing floating pipe and an end annular connecting steel part; the middle circular steel platform is arranged in the center of the ultra-large-span string structure arc-shaped truss; the top circumferential inhaul cable is arranged between upper chord steel component nodes of every two adjacent super-large-span string arc-shaped trusses; the bottom circumferential reinforcing floating pipe is arranged between the lower chord arc-shaped steel parts of the two adjacent super-large-span chord arc-shaped trusses; the end circumferential connecting steel part is arranged between the ends of every two adjacent super-large-span string arc-shaped trusses. The water plane can be reduced, and the wave force is reduced; the overall stability and the anti-storm capability are enhanced; connection between the floating body and the supporting system is simplified, and cost is reduced; the photovoltaic module is prevented from directly contacting the water surface, and the power generation efficiency is improved.

Description

(1) Technical field:

[0001] The present invention belongs to the field of offshore floating photovoltaic clean energy technology, and relates to an offshore floating photovoltaic floating structure, and more specifically to a semi-floating ultra-large span cable-stayed arc truss platform structure suitable for offshore floating photovoltaic power stations. (2) Background technology:

[0002] Floating photovoltaic systems, with their advantages of conserving land resources and improving power generation efficiency, have seen rapid growth in recent years. Floating photovoltaic systems are categorized into two types: fixed and floating. Fixed photovoltaic power stations utilize pile foundations and, due to cost considerations, are only suitable for shallow waters. Floating photovoltaic power stations, on the other hand, can be used in deeper waters and offer greater potential for development.

[0003] Floating photovoltaic power stations float on the water surface with buoyancy provided by floats. This technology is still in the exploratory stage. Domestic and foreign scholars have proposed multiple floating structure design schemes to support the development of this technology. Currently, there are mainly pure float type, HDPE buoy + steel / aluminum combination type, semi-submersible type, flexible film type and other forms.

[0004] Pure float structures utilize a specially designed float system to directly support photovoltaic panels. Their buoyancy is sufficient to float and withstand heavy loads, and they are renowned for their maintenance-free, UV-resistant, and corrosion-resistant properties. They are also easy to manufacture, transport, and install. Furthermore, through non-rigid connections, the overall platform can rise and fall with the waves, reducing the internal load on the system. However, in complex marine environments, this type of floating structure has significant drawbacks. The floats have a large waterplane area, which can easily generate significant wave forces. Furthermore, the floats are weak, lightweight, and have a low center of buoyancy. Connected by lugs and connecting pins, the stresses on the structure can be excessive even in low winds or waves, risking damage to individual floats or the entire structure. Therefore, this structure is not suitable for harsh marine environments and is only suitable for small waves with crest heights of around 1 meter.

[0005] A combined HDPE pontoon and steel / aluminum floating structure uses a specialized support structure designed to elevate the photovoltaic panels, based on a pure float structure. The support structure is typically made of steel, aluminum, or other composite materials. This structure offers advantages in ease of fabrication and transportation. However, its disadvantages are that the rigid truss structure cannot rise and fall with waves, resulting in stress concentration at a single point and potential damage. Furthermore, the HDPE pontoons provide buoyancy, resulting in a large waterplane area and the potential for significant wave forces. Furthermore, the typically small size of this type of floating structure results in poor responsiveness to long-wave motion, making it suitable only for small water areas.

[0006] Semi-submersible floating structures are renowned for their small waterplane profiles, offering advantages such as excellent stability, wide water depth compatibility, and strong wind and wave resistance. They can also be scaled up to larger sizes, making them a mainstream technology currently under development both domestically and internationally. However, the floating system of a semi-submersible floating structure is completely submerged, requiring connecting columns between the floating system and the photovoltaic support structure. This results in a complex structure, high material and structural strength requirements, and high costs, leading to limited application cases.

[0007] Flexible membrane-based floating structures primarily consist of photovoltaic modules, a hydroelastic flexible membrane, buoyancy rings, and damping lines. They can withstand significant structural stress and prolonged sunlight exposure. The flexible membrane itself effectively adapts to water surface fluctuations, allowing the entire system to rise and fall with the waves. Furthermore, their close proximity to the water surface leverages the water cooling effect to enhance photovoltaic power generation efficiency. However, cyclic loads from wind, waves, and currents can cause deflection and stress in the photovoltaic modules, potentially leading to microcracks in the modules, resulting in reduced power generation and durability.

[0008] Based on the above, although the existing floating platform structure can be used in the ocean, it still has disadvantages such as small scope of application, small structural size, and poor wave resistance. Therefore, it is necessary to develop a semi-floating ultra-large span cable-stayed arc truss platform structure suitable for offshore floating photovoltaic power stations to solve the above problems. (3) Summary of the invention:

[0009] The purpose of the present invention is to provide a semi-floating, ultra-large-span, tensioned arc-shaped truss platform suitable for offshore floating photovoltaic power stations. It can address the shortcomings of the existing technology, reduce the waterline area and wave force; enhance overall stability and wind and wave resistance; simplify the connection between the float and the support system, reducing costs; and avoid direct contact between photovoltaic modules and the water surface, thereby improving power generation efficiency.

[0010] To achieve the above-mentioned purpose, the technical solution of the present invention is: a semi-floating ultra-large span stringed arc truss platform suitable for an offshore floating photovoltaic power station, comprising an ultra-large span stringed arc truss, a middle circular steel platform, a top circumferential cable, a bottom circumferential reinforcing floating tube, and an end circumferential connecting steel component; the middle circular steel platform is arranged at the center of the ultra-large span stringed arc truss; the top circumferential cable is arranged between the nodes of the upper chord steel components of two adjacent ultra-large span stringed arc trusses; the bottom circumferential reinforcing floating tube is arranged between the lower chord arc steel components of two adjacent ultra-large span stringed arc trusses; the end circumferential connecting steel component is arranged between the ends of two adjacent ultra-large span stringed arc trusses.

[0011] The central circular steel platform is a cylindrical structure with an internal cavity and a sealed circumference.

[0012] The central circular steel platform is composed of a large-diameter steel cylinder or a plurality of circular steel pipes or steel components surrounded by arc-shaped steel plates to form a closed space.

[0013] The ultra-large span chord arc truss consists of an upper chord steel component, a web member and a lower chord arc steel component; the ends of the upper chord steel component and the ends of the lower chord arc steel component are connected, and the middle parts are connected through the web member.

[0014] The length of the ultra-large span string-curved truss is greater than 120m.

[0015] The distance between the upper chord steel component and the lower chord arc-shaped steel component gradually increases from the end to the center.

[0016] The upper chord steel member is composed of two steel pipes or two cables.

[0017] The lower chord arc-shaped steel component is a curved steel pipe or two curved steel pipes connected by a connecting rod.

[0018] The end annular connecting steel component is composed of a round steel pipe or a steel truss.

[0019] The webs are all round steel tubes.

[0020] The top annular cable can be made of steel strands, semi-parallel steel wire ropes, or closed cables, and its length gradually decreases from the end to the center.

[0021] The bottom annular reinforced floating pipe is composed of an annular round steel pipe or multiple sections of straight steel pipes.

[0022] The sagittal height of the lower chord arc-shaped steel component of the ultra-large span chord arc-shaped truss is greater than the sum of the platform draft and the maximum wave height of the sea area, thereby avoiding the problem of the photovoltaic system being caught in the waves.

[0023] There are four super-large span string-curved trusses, and the central circular steel platform is arranged at the central intersection of the four super-large span string-curved trusses.

[0024] The four super-large span cable-stayed arc trusses are symmetrically distributed with the central circular steel platform as the center.

[0025] The four super-large span string trusses form an octagonal semi-floating platform structure through a central circular steel platform, a bottom annular reinforced floating tube, a top annular cable, and end annular connecting steel components.

[0026] The advantages and positive effects of the present invention are:

[0027] 1. Compared to pure float structures and HDPE buoy + steel / aluminum combined structures, this invention reduces the waterplane area. Compared to a linear float structure with the same horizontal projection length and the same cross-sectional dimensions of the lower chord steel components, the waterplane area reduction rate can reach 90%. This significantly reduces the wave forces on the structure and reduces the risk of structural damage. It has excellent wind and wave resistance and is suitable for offshore floating photovoltaic systems.

[0028] 2. Compared with the semi-submersible floating structure, the present invention eliminates the connecting column between the floating system and the upper photovoltaic support system, reducing structural complexity and thus reducing costs;

[0029] 3. It avoids direct contact between photovoltaic modules and water, thus improving the power generation efficiency of photovoltaic modules;

[0030] 4. The overall shape is symmetrical and beautiful. It is a regular octagon when viewed from above, and looks like a "blooming lotus" from a distance, which enhances its ornamental value.

[0031] 5. Compared to a regular quadrilateral structure that involves the connection of four floating structures at one point, and a regular hexagon structure that involves the connection of three floating structures at one point, a regular octagon structure only involves the connection of two floating structures at one point, and the connection nodes are relatively simple. (4) Description of the accompanying drawings:

[0032] Figure 1 This is an overall plan view of a semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to the present invention;

[0033] Figure 2 This is an overall three-dimensional axonometric diagram of a semi-floating ultra-large-span string-curved truss platform suitable for an offshore floating photovoltaic power station according to the present invention;

[0034] Figure 3 A three-dimensional axonometric drawing of a semi-floating ultra-large span cable-stayed curved truss platform suitable for an offshore floating photovoltaic power station according to the present invention, with the circumferential cables removed;

[0035] Figure 4 This is a three-dimensional axonometric drawing of a super-large-span string-curved truss structure in a semi-floating super-large-span string-curved truss platform suitable for an offshore floating photovoltaic power station according to the present invention;

[0036] Figure 5 This is a vertical view of an ultra-large span stringed arc truss structure in a semi-floating ultra-large span stringed arc truss platform suitable for an offshore floating photovoltaic power station according to the present invention.

[0037] In the figure: 1 is the ultra-large span chord arc truss; 101 is the lower chord arc steel component; 102 is the five-web member; 103 is the upper chord steel component; 2 is the middle circular steel platform; 3 is the top circumferential cable; 4 is the bottom circumferential reinforcement floating tube; 5 is the end circumferential connecting steel component; L is the length of the ultra-large span chord arc truss; f is the rise of the lower chord arc steel component of the ultra-large span chord arc truss. (V) Specific implementation methods:

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Example: Figures 1 to 5 As shown, a semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station includes an ultra-large span string-curved truss 1, a central circular steel platform 2, a top annular cable 3, a bottom annular reinforced floating pipe 4, and an end annular connecting steel component 5;

[0040] The central circular steel platform 2 is arranged at the central intersection of the four super-large span chord arc trusses 1, avoiding the complex node design of the intersection of the four super-large span chord arc trusses, and can also be used as a platform for some electrical equipment and an operation and maintenance platform;

[0041] The top hoop cable 3 is arranged between the nodes of the upper chord steel components 103 of two adjacent super-large span arc-shaped trusses 1, and is used as a flexible support for the photovoltaic panel;

[0042] The bottom annular reinforcement floating tube 4 is arranged between the lower chord arc steel components 101 of two adjacent super-large span chord arc trusses 1, which plays a role in strengthening the integrity of each truss and can provide more buoyancy to the overall structure.

[0043] The end annular connecting steel member 5 is arranged between the ends of two adjacent super-large span string-curved trusses 1 to strengthen the integrity between the trusses.

[0044] The central circular steel platform 2 is a cylindrical structure with an internal cavity and a sealed circumference.

[0045] The central circular steel platform 2 is composed of a large-diameter steel cylinder.

[0046] The length L of the ultra-large span string-curved truss 1 is greater than 150 m.

[0047] The ultra-large span chord arc truss 1 is composed of an upper chord steel component 103, a web member 102 and a lower chord arc steel component 101; the ends of the upper chord steel component 103 and the ends of the lower chord arc steel component 101 are connected, and the middle parts are connected through the web member 102.

[0048] The distance between the upper chord steel component 103 and the lower chord arc-shaped steel component 101 gradually increases from the end to the center.

[0049] The upper chord steel member 103 is composed of two steel pipes.

[0050] The lower chord arc-shaped steel component 101 is an arc-shaped steel pipe.

[0051] The end annular connecting steel component 5 is composed of a round steel pipe.

[0052] The web members 102 are all round steel pipes.

[0053] The top annular cable 3 is composed of a semi-parallel steel wire bundle or a steel strand or a closed cable.

[0054] The bottom annular reinforcement floating pipe 4 is composed of an annular round steel pipe or multiple sections of straight steel pipes.

[0055] The rise f of the lower chord curved steel component 101 of the ultra-large span chord curved truss 1 is greater than the sum of the platform draft and the maximum wave height in the sea area. In this embodiment, the rise f is 8m, thereby avoiding the problem of the photovoltaic system being caught in the waves.

[0056] There are four super-large span string-curved trusses 1 , and the central circular steel platform 2 is arranged at the central intersection of the four super-large span string-curved trusses 1 .

[0057] The four super-large span curved trusses 1 are symmetrically distributed with the central circular steel platform 2 as the center.

[0058] The four super-large span string trusses 1 form an octagonal semi-floating platform structure through the central circular steel platform 2, the bottom annular reinforced floating tube 4, the top annular cable 3, and the end annular connecting steel components 5.

[0059] This embodiment provides a semi-floating ultra-large span cable-stayed arc truss platform structure suitable for an offshore floating photovoltaic power station, which is easy to install and tow at sea; the regular octagonal geometry makes it easy to splice the platform modules.

[0060] The various components of the ultra-long-span tensioned curved truss 1 are typically constructed of round steel tubes, with cross-sections designed and verified according to the "Steel Structure Design Standard" (GB500017-2017). The top annular cables 3 are axially tensioned members, typically constructed of parallel steel wire bundles, strands, or wire ropes, with cross-sections designed and verified according to the "Technical Code for Cable Structures" (JGJ257-2012).

[0061] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A semi-floating ultra-large span string-curved truss platform suitable for offshore floating photovoltaic power stations, characterized by It includes an ultra-large span stringed arc truss, a middle circular steel platform, a top circumferential cable, a bottom circumferential reinforcing floating tube, and an end circumferential connecting steel component; the middle circular steel platform is arranged at the center of the ultra-large span stringed arc truss; the top circumferential cable is arranged between the nodes of the upper chord steel components of two adjacent ultra-large span stringed arc trusses; the bottom circumferential reinforcing floating tube is arranged between the lower chord arc steel components of two adjacent ultra-large span stringed arc trusses; the end circumferential connecting steel component is arranged between the ends of two adjacent ultra-large span stringed arc trusses.

2. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 1, characterized in that The central circular steel platform is a cylindrical structure with an internal cavity and a sealed circumference.

3. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 1 or 2, characterized in that The central circular steel platform is composed of a large-diameter steel cylinder or a plurality of circular steel pipes or steel components surrounded by arc-shaped steel plates to form a closed space.

4. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 1, characterized in that The ultra-large span chord arc truss consists of an upper chord steel component, a web member and a lower chord arc steel component; the ends of the upper chord steel component and the ends of the lower chord arc steel component are connected, and the middle parts are connected through the web member.

5. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 1 or 4, characterized in that The length of the ultra-large span string-curved truss is greater than 120m.

6. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 1 or 4, characterized in that The upper chord steel component is composed of two steel pipes or two cables; the lower chord arc-shaped steel component is a curved steel pipe or two curved steel pipes connected by a connecting rod.

7. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 1, characterized in that The end annular connecting steel component is composed of a round steel pipe or a steel truss.

8. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 1 or 4, characterized in that The sagittal height of the lower chord arc-shaped steel component of the ultra-large span chord arc-shaped truss is greater than the sum of the platform draft and the maximum wave height of the sea area in which it is located.

9. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 1 or 4, characterized in that There are four super-large span string-curved trusses, and the central circular steel platform is arranged at the central intersection of the four super-large span string-curved trusses.

10. A semi-floating ultra-large span string-curved truss platform suitable for an offshore floating photovoltaic power station according to claim 9, characterized in that The four super-large span string trusses form an octagonal semi-floating platform structure through a central circular steel platform, a bottom annular reinforced floating tube, a top annular cable, and end annular connecting steel components.

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