A large-span cable-stayed stable flexible photovoltaic support system

Abstract

The present invention relates to the technical field of photovoltaic power generation, and particularly relates to a large-span cable-stayed stable flexible photovoltaic support system. The system includes a prestressed cable structure and support columns. The top of the support columns is fixed to both ends of the prestressed cable structure. The support columns include triangular support bodies, a column cross beam and a cantilever cross beam spanning the tops of the triangular support bodies. The triangular support body includes a straight column, a column diagonal brace and a cantilever rod. The straight column is located outside the column diagonal brace and the two are connected in an inverted triangle. One end of the cantilever rod is fixed to the top of the straight column, and the other end is fixed to the top of the column diagonal brace and extends forward to form an extension end. The column cross beam is fixed to the tops of the straight columns, and the cantilever cross beam is fixed to the extension ends of the cantilever rods. The prestressed cable structure includes main cables and load-bearing cables. Both ends of the main cables are connected to the column cross beam, and both ends of the load-bearing cables are connected to the cantilever cross beam. This system increases the span of the flexible photovoltaic support to about 70-80 m while having better stress characteristics.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic power generation, and in particular to a large-span oblique-stayed stable flexible photovoltaic support system. Background Art

[0002] Photovoltaic power generation has a low energy density and the power station occupies a large area. With the continuous advancement of the photovoltaic process, flat and open land resources are becoming less and less. Many photovoltaic power stations have to consider building in areas with complex terrain conditions, multiple functions, larger slopes, and poor hydrological conditions, such as flood-inundated areas, canals, sewage treatment plants, and mountains with gullies. However, due to terrain restrictions, the ground-fixed photovoltaic bracket can be installed in a small area in these areas, and the construction is difficult and the economy is poor. As a new type of photovoltaic bracket, the flexible bracket can adapt to more complex terrains by taking advantage of the characteristics of large span and less foundation, and has broad application prospects.

[0003] At present, most photovoltaic flexible brackets are installed with columns at intervals of 30-50m as intermediate supports. However, many scenarios require larger column spacing and do not allow any devices to be installed in the middle, such as navigable rivers, main canals, factory roofs, etc.

[0004] Patent CN109921726A proposes a flexible photovoltaic bracket that uses installation cables, load-bearing cables, and columns to support photovoltaic modules. This solution has a simple structure but is only applicable to situations where the distance between columns is about 30-40m. As the distance between columns increases, the prestress of the cables and the load on the columns increase, which can easily cause structural damage. Patent CN108400750A proposes a diagonal flexible photovoltaic bracket unit and photovoltaic bracket, which installs higher columns at both ends of the prestressed cables and uses diagonal cables to provide upward support for the prestressed cables to reduce deflection. However, the high columns of this solution cast shadows on the photovoltaic modules, affecting the power generation; Patent CN214228159U proposes a flexible photovoltaic bracket and photovoltaic array, which is provided with a transverse stabilizing cable between two columns to enhance the torsional stiffness of the array. However, the stabilizing cable is anchored in the middle of the column interval through a pile foundation, which makes it difficult to construct a pile foundation for application scenarios such as rivers and factories. Summary of the invention

[0005] The purpose of the present invention is to address the defects of the prior art and provide a large-span oblique-stayed stable flexible photovoltaic support system, so that the span of the flexible photovoltaic support is increased to about 70-80m while having better stress characteristics.

[0006] A large-span cable-stayed stable flexible photovoltaic support system provided by the present invention includes a prestressed cable structure and support columns arranged at both ends of the prestressed cable structure. The top of the support column is fixed to both ends of the prestressed cable structure, and the bottom is fixed to the ground. The support column includes triangular support bodies evenly distributed in the y-axis direction, and a column cross beam and a cantilever cross beam straddling the tops of the triangular support bodies. The triangular support body includes a straight column, a column diagonal brace, and a cantilever rod. The straight column is located outside the column diagonal brace and the two are connected in an inverted triangle. The elevations of the straight column and the column diagonal brace are the same. The length direction of the cantilever rod is along the x-axis direction, and one end is fixed to the top of the straight column, and the other end is fixed to the top of the column diagonal brace and extends forward to form an extension end. The column cross beam is fixed to the tops of the straight columns, and the cantilever cross beam is fixed to the extension ends of the cantilever rods. The prestressed cable structure includes a plurality of main cables and load-bearing cables extending in the x-axis direction and used for supporting photovoltaic modules. Both ends of the main cable are connected to the column cross beam, and both ends of the load-bearing cable are connected to the cantilever cross beam;

[0007] Wherein, the length direction of the main cable is the x-axis direction, and the direction perpendicular to the x-axis in the horizontal plane is the y-axis direction.

[0008] More preferably, the support column further includes a column stay cable. The column stay cable is a prestressed cable. One end of the column stay cable is fixed to the top of the straight column, and the other end is fixed to the ground.

[0009] More preferably, the load-bearing cable is arranged below the main cable through a stabilizing structure, and the load-bearing cable is in a downward convex shape.

[0010] More preferably, a load-bearing cable is arranged between every two main cables.

[0011] More preferably, the prestressed cable structure includes side cables extending in the x-axis direction and located on both sides. The stabilizing structure includes diagonal stay cables, horizontal stay cables, and stabilizing support rods. The stabilizing support rods are evenly distributed in the y-axis direction. The stabilizing support rods are in a V shape. The top of each stabilizing support rod is respectively connected to two main cables. The horizontal stay cable and the load-bearing cable are both connected to the bottom of each stabilizing support rod. The length direction of the horizontal stay cable is along the y-axis direction. Both ends of the horizontal stay cable are connected to the side cables and extend downward to form diagonal stay cables. The diagonal stay cables are fixed to the ground.

[0012] More preferably, the fixing points of the diagonal stay cables on the ground and the fixing points of the support columns on the same side on the ground have the same x coordinate.

[0013] More preferably, the x-axis direction is the east-west direction, the y-axis direction is the north-south direction, and the support columns are arranged on both sides of the prohibited construction area.

[0014] More preferably, the connection angle between the vertical column and the column diagonal brace is 30 to 60 degrees.

[0015] More preferably, the photovoltaic modules are arranged on the main cables, and one row of photovoltaic modules is arranged on every two main cables.

[0016] More preferably, the length direction of the photovoltaic module is perpendicular to the length direction of the main cable.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By adopting a triangular diagonal brace column and the cantilever rod having an extended end, the cantilever cross beam is closer to the central position. The structure of the cantilever rod and the cantilever cross beam can reduce the span of the load-bearing cable between the cantilever cross beams on the east and west sides of the photovoltaic system, thereby greatly reducing the tension of the load-bearing cable; the cantilever cross beam provides a vertically upward supporting force for the main cable, reducing the vertical deformation and tension of the main cable, and can reduce the diameter of the prestressed cable, improving the safety of the structure in large-span application scenarios.

[0019] 2. By arranging the side cable and the stay cable stabilizing structure, the horizontal stabilizing cable is anchored near the two side columns after turning through the side cable, which not only maintains the advantage of the stabilizing horizontal cable in improving the overall stiffness of the flexible photovoltaic support, but also avoids installing the anchoring foundation on the ground between the two side columns, and is applicable to the areas where construction is prohibited between the columns.

[0020] 3. The column diagonal brace provides a supporting effect on the cantilever rod, reducing the bending moment at the end, so that the length of the cantilever rod can be extended; arranging the column diagonal brace in the middle of the cantilever rod can avoid the poor supporting effect due to the too large angle of the column diagonal brace and save the usage amount of steel, reducing the cost. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the setting of the present invention and the photovoltaic modules;

[0022] Figure 2 It is a three-dimensional structure schematic diagram of the present invention;

[0023] Figure 3 It is a top view schematic diagram of the present invention;

[0024] Figure 4 It is a schematic diagram of the cross section of the stabilizing structure;

[0025] Figure 5 It is a front view of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the supporting column of the present invention.

[0027] In the figure: 1, support column; 2, prestressed cable structure; 3, stabilizing structure; 4, ground; 5, photovoltaic module; 11, straight column; 12, column diagonal brace; 13, cantilever rod; 14, column cross beam; 15, cantilever cross beam; 16, column stay cable; 21, main cable; 22, load-bearing cable; 23, side cable; 31, diagonal stay stabilizing cable; 32, horizontal stabilizing cable; 33, stabilizing support rod. Specific implementation mode

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0032] Embodiment 1

[0033] This embodiment provides a feasible solution for this system, which mainly includes a support column 1, a prestressed cable structure 2 and a stabilizing structure 3.

[0034] The support column 1 is used to fixedly support the prestressed cable and the photovoltaic module 5 at a certain height from the ground. The support column 1 includes a straight column 11, a column diagonal brace 12, a cantilever rod 13, a column cross beam 14, a cantilever cross beam 15 and a column stay cable 16.

[0035] The prestressed cable structure 2 uses prestressed cables to support the photovoltaic modules 5, and includes main cables 21, load-bearing cables 22 and side cables 23.

[0036] The stabilizing structure 3 is used to reduce the deformation of the prestressed cable structure 2 and enhance the torsional stiffness of the system, and includes stay cables 31, horizontal stabilizing cables 32 and stabilizing support rods 33.

[0037] The straight vertical column 11 and the column brace 12 share a concrete foundation for fixation at the ground. The straight vertical column 11 is installed perpendicular to the horizontal plane, the column brace 12 is installed at a certain angle with the straight vertical column 11, and the tops of the straight vertical column 11 and the column brace 12 are at the same horizontal plane.

[0038] One end of the column stay cable 16 is connected to the top of the straight vertical column 11 after being tensioned, and the other end is anchored to the ground with a concrete foundation. The stay cable applies a certain pre-tension to balance the bending moment of the straight vertical column 11.

[0039] The cantilever beam 13 is installed at the tops of the straight vertical column 11 and the column brace 12, starting from the top of the straight vertical column 11 at one end and extending a certain distance after reaching the top of the column brace 12 at the other end.

[0040] The column cross beam 14 is installed at the tops of the straight vertical columns 11 and is rigidly connected to the straight vertical columns 11 and the cantilever beam 13.

[0041] The cantilever cross beam 15 is vertically fixed to the extended end of the cantilever beam 13.

[0042] Preferably, the angle between the straight vertical column 11 and the column brace 12 is 30 - 60 degrees, and the material is selected as concrete piles or steel sections.

[0043] Preferably, the materials of the cantilever beam 13, the column cross beam 14 and the cantilever cross beam 15 are selected as steel sections, and the connection methods with the straight vertical column 11 and the column brace 12 are welding or bolt connection.

[0044] The main cable 21 is prestressed and fixed at both ends to the column cross beam 14 with anchors, in an approximately horizontal straight line shape. Passing through the part of the cantilever cross beam 15, a vertically upward supporting force is provided by the cantilever cross beam 15. Two main cables 21 are arranged for a row of photovoltaic modules 5, and the positions of the main cables 21 match the inclination angle and the installation hole positions of the photovoltaic modules 5.

[0045] The load-bearing cable 22 is prestressed and fixed at both ends to the cantilever cross beam 15 with anchors. The load-bearing cable 22 is connected to the main cable 21 through the stabilizing support rod 33 and is in a downward convex shape.

[0046] The side cable 23 is prestressed and fixed at both ends to the cantilever cross beam 15 with anchors, and no photovoltaic modules 5 are installed on the side cable 23.

[0047] The stable support rod 33 is arranged at an angle by two rigid rods, with the lower end connected to the horizontal stabilizing cable 32 and the upper end connected to the corresponding two main cables 21.

[0048] Preferably, the connection between the stable support rod and the main cable 21 is made by bolt connection.

[0049] The horizontal stabilizing cable 32 is prestressed and arranged in a straight line perpendicular to the load-bearing cable 22, and is connected to the bottom of the stable support rod. Both ends of the horizontal stabilizing cable 32 are obliquely pulled to the side cable 23.

[0050] The stay stabilizing cable 31 and the horizontal stabilizing cable 32 are the same steel cable. After the horizontal stabilizing cable 32 is obliquely pulled to the side cable 23, it is obliquely pulled downward to the concrete foundation near the column through the deflector on the side cable 23.

[0051] Embodiment 2

[0052] Figures 1-5 The structure diagram of a large-span stay-stabilized flexible photovoltaic support system provided by a preferred embodiment of the present application is shown. For the sake of convenience of description, only the parts related to this embodiment are shown and are described in detail as follows:

[0053] This system consists of a support column 1, a prestressed cable structure 2, and a stabilizing structure 3. Among them, the support column 1 is used to provide a supporting force for the prestressed cable structure 2 and the photovoltaic module 5, so that they are maintained at a certain height above the ground 4, and the middle of the ground 4 is a prohibited construction area. The photovoltaic module 5 is arranged vertically facing south.

[0054] The support column 1 consists of six structures: a straight column 11, a column diagonal brace 12, a cantilever rod 13, a column cross beam 14, a cantilever cross beam 15, and a column stay cable 16. It is mainly used to support the prestressed cable structure 1 and the photovoltaic module 5 to be stably maintained at a certain height above the ground under the action of wind load and snow load. The spacing of the straight columns 11 in the east-west direction is about 80m, and the spacing of the straight columns in the north-south direction is about 3m. The straight column 11 and the column diagonal brace 12 are connected in an inverted triangle, with the same top elevation and rigidly connected at the bottom, and the connection angle is 30 - 60 degrees. The materials of both can be selected from section steel or concrete piles. The cantilever rod 13 is placed at the top of the straight column 11 and the column diagonal brace 12 and extends a certain length. The column cross beam 14 and the cantilever cross beam 15 are respectively fixed to the top of the straight column 11 and the extended end of the cantilever rod 13. It is recommended to use section steel for the material, and the fixing form is welding or bolt connection. The length of the cantilever rod 13 can reach 8 - 15m, that is, to reduce the distance between the cantilever cross beams 15 on the east and west sides of the photovoltaic system to 16 - 30m. The column stay cable 16 uses prestressed steel strands, with one end fixed to the top of the straight column 11 and the other end anchored to the ground 4 through a concrete foundation, which is used to reduce the bottom moment of the straight column.

[0055] The prestressed cable structure 2 is used to fix and support the photovoltaic modules 5. It mainly uses prestressed steel strands arranged in the east-west direction and includes main cables 21, load-bearing cables 22, and side cables 23. Both ends of the main cable 21 are fixed to the column crossbeams 14 on both sides. Each row of photovoltaic modules 5 is installed on two main cables 21. The spacing of the main cables 21 is determined according to the inclination angle of the photovoltaic modules 5 and the position of the installation holes. The cantilever crossbeam 15 provides a vertically upward supporting force for the main cable 21 through the connecting structure, reducing the deformation and tension of the main cable 21. The load-bearing cable 22 is arranged in the middle of the main cable 21 and is connected to the main cable 21 through the connecting and stabilizing structure 3. It is in a downward convex shape. After applying prestress, it can reduce the deformation and tension of the main cable 21 and improve the structural safety. Since the load-bearing cable 22 is only connected to the cantilever crossbeam 15, and the middle section from the straight column 11 to the cantilever crossbeam 15 has a small spacing, the load-bearing cable 22 is not provided in this section. Only two main cables 21 are used to support the photovoltaic modules 5. The side cable 23 is also a prestressed steel strand, which is used to stabilize the turning of the structure 3 and is not used for supporting the photovoltaic modules 5. Both ends are fixed to the cantilever crossbeam 15 by anchors. Because the side cable 23 does not have the function of bearing weight, the pre-tension of the side cable 23 is relatively smaller than that of the main cable 21 and the load-bearing cable 22. No photovoltaic modules are installed on it, and no load-bearing cable 22 is provided below it.

[0056] The stabilizing structure 3 is mainly used to resist the deformation and torsion of the photovoltaic system caused by the wind load in the north-south direction. It is composed of diagonal stabilizing cables 31, horizontal stabilizing cables 32, and stabilizing support rods 33. A plurality of stabilizing structures 3 are arranged between the east-west spans of the straight columns 11. The horizontal stabilizing cable 32 is fixedly connected to the load-bearing cable 22 through a bolt connector and is arranged in the vertical direction. At the same time, the connection point is connected to the stabilizing support rod 33. The stabilizing support rod 33 is in an inverted triangle shape, and the top is respectively connected to two main cables 21, as Figure 4 shown. The diagonal stabilizing cable 31 and the horizontal stabilizing cable 32 are the same steel strand. The horizontal stabilizing cable 32 passes through the load-bearing cable 22 on the north-south side and then is obliquely pulled upward to the side cable 23. Through the turning structure on the side cable 23, it is obliquely pulled downward to the anchoring foundation near the straight column 11, as Figure 2 and Figure 3 shown.

[0057] The present invention is mainly applicable to special scenarios such as river channels, sewage treatment ponds, and factories with a span of about 80m, where construction is prohibited in the middle of the span and the traditional scheme has potential safety hazards. The present invention uses triangular support columns 1 to reduce the connection spacing of the load-bearing cable 22, which can effectively reduce the cable tension; provides a vertical force for the main cable 21 at the cantilever crossbeam 15, reducing the deformation and cable tension of the main cable 21, and improving the wind resistance and stability of the overall system. The stabilizing structure 3 turns multiple diagonal stabilizing cables 31 through the side cable 23 and then centrally connects them to the anchoring foundations on both sides, avoiding construction in the middle of the span of the straight column 11 and reducing the number of anchoring foundations, making the application scenario of the flexible photovoltaic support more extensive.

[0058] Although the present invention makes relatively frequent use of: 1. support columns; 2. prestressed cable structures; 3. stabilizing structures; 4. the ground; 5. photovoltaic modules; 11. straight columns; 12. column braces; 13. cantilever rods; 14. column crossbeams; 15. cantilever crossbeams; 16. column stay cables; 21. main cables; 22. load-bearing cables; 23. side cables; 31. diagonal stay stabilizing cables; 32. horizontal stabilizing cables; 33. stabilizing support rods. However, the possibility of using other terms cannot be excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0059] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A large-span cable-stayed stable flexible photovoltaic support system, characterized in that: It includes a prestressed cable structure (2) and support columns (1) arranged at both ends of the prestressed cable structure (2). The top of the support column (1) is fixed to both ends of the prestressed cable structure (2), and the bottom is fixed to the ground. The support column (1) includes triangular supports evenly distributed along the y-axis direction, and a column cross beam (14) and a cantilever cross beam (15) spanning the tops of the triangular supports. The triangular support includes a straight column (11), a column diagonal brace (12), and a cantilever rod (13). The straight column (11) is located outside the column diagonal brace (12) and the two are connected in an inverted triangle. The elevations of the straight column (11) and the column diagonal brace (12) are the same. The length direction of the cantilever rod (13) is along the x-axis direction, and one end is fixed to the top of the straight column (11), and the other end is fixed to the top of the column diagonal brace (12) and extends forward to form an extension end. The column cross beam (14) is fixed to the tops of the straight columns (11), and the cantilever cross beam (15) is fixed to the extension ends of the cantilever rods (13). The prestressed cable structure (2) includes multiple main cables (21) and load-bearing cables (22) extending along the x-axis direction and used to support the photovoltaic modules (5). The two ends of the main cable (21) are connected to the column cross beam (14), and the two ends of the load-bearing cable (22) are connected to the cantilever cross beam (15); wherein, the length direction of the main cable (21) is the x-axis direction, and the direction perpendicular to the x-axis in the horizontal plane is the y-axis direction.

2. The large-span cable-stayed stable flexible photovoltaic support system according to claim 1, characterized in that: The support column (1) further includes a column diagonal cable (16). The column diagonal cable (16) is a prestressed cable. One end of the column diagonal cable (16) is fixed to the top of the straight column (11), and the other end is fixed to the ground.

3. The large-span cable-stayed stable flexible photovoltaic support system according to claim 1, characterized in that: The load-bearing cable (22) is arranged below the main cable (21) through a stabilizing structure (3), and the load-bearing cable (22) is in a downward convex shape.

4. The large-span cable-stayed stable flexible photovoltaic support system according to claim 1, characterized in that: A load-bearing cable (22) is arranged between every two main cables (21).

5. The large-span cable-stayed stable flexible photovoltaic support system according to claim 3, characterized in that: The prestressed cable structure (2) includes side cables (23) extending along the x-axis direction and located on both sides. The stabilizing structure (3) includes stay cables (31), horizontal stabilizing cables (32), and stabilizing support rods (33). The stabilizing support rods (33) are evenly distributed along the y-axis direction. The stabilizing support rods (33) are in a V shape. The top of each stabilizing support rod (33) is respectively connected to two main cables (21). The horizontal stabilizing cable (32) and the load-bearing cable (22) are both connected to the bottom of each stabilizing support rod (33). The length direction of the horizontal stabilizing cable (32) is along the y-axis direction. Both ends of the horizontal stabilizing cable (32) are connected to the side cables (23) and extend obliquely downward to form stay cables (31). The stay cables (31) are fixed to the ground.

6. The large-span stay cable-stabilized flexible photovoltaic support system according to claim 5, characterized in that: the fixed point of the stay cable (31) on the ground and the fixed point of the support column (1) on the same side on the ground have the same x coordinate.

7. The large-span stay cable-stabilized flexible photovoltaic support system according to claim 1, characterized in that: the x-axis direction is the east-west direction, the y-axis direction is the north-south direction, and the support columns (1) are arranged on both sides of the prohibited construction area.

8. The large-span stay cable-stabilized flexible photovoltaic support system according to claim 1, characterized in that: the connection angle between the straight column (11) and the column brace (12) is 30 to 60 degrees.

9. The large-span stay cable-stabilized flexible photovoltaic support system according to claim 1, characterized in that: the photovoltaic modules (5) are arranged on the main cables (21), and one row of photovoltaic modules (5) is arranged on every two main cables (21).

10. The large-span stay cable-stabilized flexible photovoltaic support system according to claim 1, characterized in that: the length direction of the photovoltaic modules (5) is perpendicular to the length direction of the main cables (21).

Images