Desert flexible photovoltaic support and photovoltaic support system

Abstract

The invention relates to the technical field of photovoltaic installation, in particular to a desert flexible photovoltaic support and a photovoltaic support system. A desert flexible photovoltaic support comprises a stand column, the bottom of which is suitable for being buried in the desert geology; the stud is arranged in the desert geology, the stud is partially inserted into the stand column, and the stud is used for improving the uplift bearing capacity of the stand column. The problems that sunlight in a desert area is sufficient, but the desert geology is difficult to bear heavy objects, so that related areas cannot be fully developed and utilized are solved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic installation, and in particular to a desert flexible photovoltaic bracket and a photovoltaic bracket system. Background Art

[0002] The global energy shortage is likely to cause ecological damage. With the continuous promotion and implementation of low-carbon and environmentally friendly concepts, human exploration of energy is more inclined to renewable green energy to better ensure energy supply and green environmental protection. These concepts have promoted the development of solar photovoltaic power stations.

[0003] Solar photovoltaic modules are a clean and efficient energy conversion device, mainly made of semiconductor silicon and other materials. The power generation process is simple, there are no mechanical rotating parts, no fuel required, and no emissions of any gas. It has the advantages of no noise, no pollution, simple maintenance, and stable operation.

[0004] At present, photovoltaic ground power stations are mostly built in the Gobi Desert, as well as in relatively good conditions such as rooftops, mountains, fish ponds, and tidal flats. In the northwest region, the desert area has sufficient sunlight, but the desert geology is difficult to carry heavy objects, resulting in the inability to fully develop and utilize the relevant areas. Summary of the invention

[0005] In view of this, the present invention provides a desert flexible photovoltaic bracket and a photovoltaic bracket system to solve the problem that there is sufficient sunlight in the desert area, but the desert geology is difficult to bear heavier objects, resulting in the inability to fully develop and utilize the relevant areas.

[0006] In a first aspect, the present invention provides a desert flexible photovoltaic support, comprising:

[0007] A column, the bottom of which is suitable for being buried in desert geology;

[0008] The bolt is arranged in the desert geology, and the bolt part is inserted into the column, and the bolt is used to improve the pull-out bearing capacity of the column.

[0009] By burying bolts in the desert geology, the pull-out bearing capacity of the column is improved, and the embedding effect of the soft desert soil on the column is enhanced. After supporting the column, other devices are set on the column to realize the development and utilization of the desert geology.

[0010] In an optional embodiment, it also includes a load-bearing component, which is arranged on the top of the column. The load-bearing component includes a fixing plate and a fastening half ring, and the fastening half ring is fixedly connected to the fixing plate. A space is formed between the fastening half ring and the fixing plate to allow a flexible steel cable to pass through.

[0011] In an optional embodiment, the bearing assembly further includes two first semi-annular plates, which are enclosed on the outer circumference of the column by fasteners, a supporting beam is fixed to the outer circumference of the first semi-annular plates, and a fixing plate is provided on the top of the supporting beam.

[0012] In an optional embodiment, the concentrated force G1 transmitted by the flexible steel cable borne by the supporting beam is: G1 = μ·N...①

[0013] Wherein, μ is the friction coefficient between the first semi-annular plate and the column, and N is the contact pressure between the first semi-annular plate and the column;

[0014] N=σ N ·A……②

[0015] Among them, σ N is the contact stress between the first semi-annular plate and the surface of the column, and A is the contact area between the first semi-annular plate and the surface of the column;

[0016] A=π·D·H……③

[0017] Wherein, D is the outer diameter of the column, and H is the height of the first semi-annular plate;

[0018] The first semi-annular plate is in mechanical balance in the circumferential direction, that is,

[0019]

[0020] Substituting equations ② and ③ into ④, we get: T = G1 / (2μ·π)……⑤

[0021] Wherein, T is the preload force exerted by the fastener on the first semi-annular plate;

[0022] The tensile stress generated in the cross section of the first semi-annular plate is σ T , then: T = σ T ·t·H

[0023] We get: T =T / (t·H)=G1 / (2μ·π·t·H).

[0024] In an optional embodiment, the downward concentrated force generated by the flexible steel cable at the supporting beam is G1, and the bending moment at the connection is: M1=G1*L, where L is the distance between the force-bearing part of the supporting beam and the connection part of the first semi-annular plate;

[0025] The existence of bending moment causes non-uniform stress in the cross section of the first semi-annular plate, and the maximum tensile stress generated at the edge of the first semi-annular plate is:

[0026] The maximum compressive stress is: Among them, W z is the section resistance moment of the end surface of the first semi-annular plate;

[0027] Since the entire first semi-annular plate is also subjected to uniform pre-tightening tensile stress, the maximum tensile stress at the cross section of the first semi-annular plate is:

[0028] The maximum compressive stress is:

[0029] In an optional embodiment, the bearing assembly also includes two second semi-annular plates, which are enclosed on the outer circumference of the column by fasteners, and a supporting plate is fixed to the outer circumference of the second semi-annular plate, and a fixing plate is provided on the top of the supporting plate.

[0030] In an optional embodiment, it also includes a connecting diagonal rod and two third semi-annular plates, one end of the connecting diagonal rod is fixedly connected to the supporting plate, and the other end is fixedly connected to the third semi-annular plate, and the two third semi-annular plates are enclosed on the outer circumference of the column by fasteners.

[0031] In an optional embodiment, the angle between the connecting diagonal rod and the supporting plate is α1, the tensile force on the supporting plate is F1=G1cotα1, and the pressure on the connecting diagonal rod is: F2=G1 / sinα1;

[0032] The second semi-annular plate is in mechanical balance in the circumferential direction, that is, the stress of the cross section of the second semi-annular plate is: Wherein, t1 is the thickness of the second semi-annular plate, h1 is the height of the second semi-annular plate, and T1 is the preload force applied by the fastener on the second semi-annular plate.

[0033] In a second aspect, the present invention further provides a photovoltaic support system, including the above-mentioned desert flexible photovoltaic support.

[0034] In an optional embodiment, a plurality of photovoltaic components are arranged between the two flexible steel cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of a desert flexible photovoltaic support according to an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the connection between a first semi-annular plate, a fastener and a column according to an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of the force of the first semi-annular plate according to an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of stress distribution generated on a cross section of a first semi-annular plate according to an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of stress distribution generated when a cross section of a first semi-annular plate according to an embodiment of the present invention is subjected to uniform pre-tightening tensile stress;

[0041] Figure 6 A schematic diagram of another desert flexible photovoltaic support according to an embodiment of the present invention;

[0042] Figure 7 is a schematic diagram of another bearing assembly according to an embodiment of the present invention;

[0043] Figure 8 Schematic diagram of a photovoltaic support system according to an embodiment of the present invention.

[0044] Explanation of the reference numerals: 1. column; 2. load-bearing assembly; 201. first semi-annular plate; 202. fastener; 203. supporting beam; 204. fixing plate; 205. fastening semi-ring; 206. second semi-annular plate; 207. supporting plate; 208. connecting diagonal rod; 209. third semi-annular plate; 3. desert geology; 4. bolt; 5. flexible steel cable; 6. photovoltaic assembly; 7. supporting diagonal rod. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0046] Example 1

[0047] Combine the following Figures 1 to 5 , describing an embodiment of the present invention.

[0048] According to an embodiment of the present invention, on the one hand, a desert flexible photovoltaic support is provided, comprising:

[0049] The column 1, the bottom of which is suitable for being buried in the desert geology 3; the bolt 4, the bolt 4 is arranged in the desert geology 3, and the bolt 4 is partially inserted into the column 1, so as to improve the pull-out bearing capacity of the column 1.

[0050] By burying the bolts 4 in the desert geology 3, the pull-out bearing capacity of the column 1 is improved, and the embedding effect of the soft desert soil on the column 1 is enhanced.

[0051] like Figure 1 , Figure 4 and Figure 5 As shown, in one embodiment, it also includes a bearing assembly 2, which is arranged on the top of the column 1. The bearing assembly 2 includes a fixing plate 204 and a fastening half ring 205. The fastening half ring 205 is fixedly connected to the fixing plate 204, and a space is formed between the fastening half ring 205 and the fixing plate 204 to allow the flexible steel cable 5 to pass through.

[0052] In this embodiment, by setting the fastening half ring 205 and the fixing plate 204, a space is formed to allow the flexible steel cable 5 to pass through. After the flexible steel cable 5 passes through, the fastening half ring 205 and the fixing plate 204 press the flexible steel cable 5 to fix it. It should be noted that the connection method of the fastening half ring 205 and the fixing plate 204 is not specifically limited, and can be plug-in, clamping, screwing, etc. The fastening half ring 205 is "U"-shaped. Specifically, the fastening half ring 205 is a U-shaped bolt, and the fastening plate is a U-shaped plate. In addition, the column 1 is a prefabricated pile structure, which is a hollow setting.

[0053] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in one embodiment, the bearing assembly 2 also includes two first semi-annular plates 201, which are enclosed on the outer peripheral surface of the column 1 by fasteners 202, and a supporting beam 203 is fixed to the outer periphery of the first semi-annular plate 201, and a fixing plate 204 is provided on the top of the supporting beam 203.

[0054] In this embodiment, a first semi-circular plate 201 is provided to be fixed to the column 1, and then a supporting beam 203 is fixed to the first semi-circular plate 201, and the supporting beam 203 is used to bear the downward force transmitted by the flexible steel cable 5. Specifically, the first semi-circular plate 201 is made of steel plate, and the supporting beam 203 is H-shaped steel.

[0055] like Figure 1 , Figure 2 , Figure 3 As shown, in one embodiment, the concentrated force G1 transmitted by the flexible steel cable 5 borne by the supporting beam 203 is: G1 = μ·N……①

[0056] Wherein, μ is the friction coefficient between the first semi-annular plate 201 and the column 1, and N is the contact pressure between the first semi-annular plate 201 and the column 1;

[0057] N=σ N ·A……②

[0058] Among them, σ N is the contact stress between the first semi-annular plate 201 and the surface of the column 1, and A is the contact area between the first semi-annular plate 201 and the surface of the column 1;

[0059] A=π·D·H……③

[0060] Wherein, D is the outer diameter of the column 1, and H is the height of the first semi-annular plate 201;

[0061] The first semi-annular plate 201 is in mechanical balance in the circumferential direction, that is, Figure 3 There is a mechanical equilibrium in the X direction shown, ∑X=0:

[0062]

[0063] Substituting equations ② and ③ into ④, we get: T = G1 / (2μ·π)……⑤

[0064] Wherein, T is the preload force exerted by the fastener 202 on the first semi-annular plate 201;

[0065] The tensile stress generated in the cross section of the first semi-annular plate 201 is σ T ( Figure 4 ), then: T = σ T ·t·H……⑥

[0066] We get: T =T / (t·H)=G1 / (2μ·π·t·H)≤[σ f ]……⑦

[0067] Among them, [σ f ] is the standard allowable strength of the first semi-annular plate 201, and the thickness and height of the first semi-annular plate 201 are then selected.

[0068] Assume that there are n fasteners 202 on each side of the first semi-annular plate 201, and the allowable strength of the fasteners 202 is [σ b ]

[0069] It is deduced that:

[0070] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, in one embodiment, the downward concentrated force generated by the flexible steel cable 5 at the supporting beam 203 is G1, and the bending moment at the connection is: M1=G1*L, where L is the distance between the force-bearing part of the supporting beam 203 and the connection part of the first semi-annular plate 201;

[0071] The existence of the bending moment causes non-uniform stress to be generated on the cross section of the first semi-annular plate 201 ( Figure 5 As shown), the maximum tensile stress generated at the edge of the first semi-annular plate 201 is:

[0072] The maximum compressive stress is: Among them, W z is the cross-sectional resistance moment of the end surface of the first semi-annular plate 201;

[0073] Since the entire first semi-annular plate 201 is also subjected to uniform pre-tightening tensile stress, the maximum tensile stress at the cross section of the first semi-annular plate 201 is:

[0074] The maximum compressive stress is:

[0075] That is, when the height H of the first semi-annular plate 201 is determined, the thickness t of the first semi-annular plate 201 is obtained according to the allowable strength specified in the specification and the external load G1.

[0076] The maximum tensile force on the fastener 202 on the first semi-annular plate 201 is: Wherein, m is the number of vertical columns in which the fasteners 202 are arranged, and combined with equation ⑦, we obtain: Specifically, the fastener 202 is a bolt-type combination ⑤, and the diameter of the fastener 202 needs to meet: Finally, the diameter of the fastener 202 is calculated according to the tension and bending moment applied to the fastener 202 , thereby selecting the model of the fastener 202 .

[0077] According to an embodiment of the present invention, on the other hand, a photovoltaic support system is also provided. Figure 8 As shown, the above-mentioned desert flexible photovoltaic support includes two flexible steel cables 5 , a plurality of photovoltaic modules 6 are arranged between the two flexible steel cables 5 , and a supporting diagonal rod 7 is arranged on the side of the column 1 .

[0078] During the specific implementation process, a hydraulic vibrating pile driver is used to drive steel piles with bolts 4 around them into the desert soil. The function of the bolts 4 is to increase the friction and grip between the column 1 and the desert soil, and to enhance the embedding effect of the desert soil on the column 1. The flexible steel cable 5 is connected to the supporting beam 203 through U-bolts and a U-plate. Bolt holes are provided on the upper surface of the U-plate. The wing plates on both sides of the U-plate are welded to the side of the supporting beam 203. The flexible steel cable 5 passes through the U-bolt holes and is fixed to the top of the U-plate. Because the flexible steel cable 5 is a flexible material with a certain strength, after the flexible steel cable 5 is tensioned, the self-weight of the photovoltaic module 6 will cause the steel strand to have a certain downward deflection. Under the action of wind load, the wind will generate an upward lifting force or downward pressure on the photovoltaic module 6, causing the photovoltaic module 6 to produce an upward or downward fluctuation deformation. Therefore, a certain distance needs to be left between the front and rear rows of photovoltaic panels to prevent the edges of the photovoltaic panels from being squeezed against each other when the flexible steel cable 5 is deformed, causing deformation or damage to the photovoltaic panel assembly. At the same time, the inclined cable should be tensioned in time after the assembly is installed to ensure that a stable structural system is formed in the longitudinal direction along the slope.

[0079] Example 2

[0080] Combine the following Figure 6 to Figure 7 , describing an embodiment of the present invention.

[0081] like Figure 6 , Figure 7 As shown, in one embodiment, the bearing assembly 2 includes two second semi-annular plates 206, which are enclosed on the outer circumference of the column 1 by fasteners 202, and a supporting plate 207 is fixed to the outer circumference of the second semi-annular plate 206, and a fixing plate 204 is provided on the top of the supporting plate 207.

[0082] In this embodiment, the fixing plate 204 is fixed by a supporting plate 207 , and the second semi-annular plate 206 is connected to the supporting plate 207 and to the column 1 .

[0083] like Figure 6 , Figure 7 As shown, in one embodiment, it also includes a connecting diagonal rod 208 and two third semi-annular plates 209, one end of the connecting diagonal rod 208 is fixedly connected to the supporting plate 207, and the other end is fixedly connected to the third semi-annular plate 209, and the two third semi-annular plates 209 are enclosed on the outer peripheral surface of the column 1 by fasteners 202.

[0084] In this embodiment, it is assumed that the angle between the connecting diagonal rod 208 and the supporting plate 207 is α1, the tension on the supporting plate 207 is F1=G1cotα1, and the pressure on the connecting diagonal rod 208 is: F2=G1 / sinα1;

[0085] The second semi-annular plate 206 is in mechanical balance in the circumferential direction, that is, the stress of the cross section of the second semi-annular plate 206 is: Wherein, t1 is the thickness of the second semi-annular plate 206, h1 is the height of the second semi-annular plate 206, and T1 is the pre-tightening force applied by the fastener 202 on the second semi-annular plate 206;

[0086] Assume that n fasteners 202 are provided on each side of the second semi-annular plate 206, and the allowable strength of the fasteners 202 is [σ b ], the diameter of the fastener 202 is:

[0087] get:

[0088] The internal force F2 connecting the inclined rod 208 is transmitted to the third semi-annular plate 209 and decomposed into a vertical downward component force F 2v =G1, and the horizontal force F2h=G1cotα1, the direction of the horizontal force points to the center of the column 1, the preload force applied by the fastener 202 on the third semi-annular plate 209 is T2, assuming that the thickness of the third annular plate is t2 and the height is h2, then the stress combination formula ⑤ of the cross section of the third semi-annular plate 209 satisfies:

[0089]

[0090] Assuming that there are n fasteners 202 on each side of the third semi-annular plate 209, the allowable strength of the fasteners 202 is [σ b ], then the diameter d of the fastener 202 b The model of the fastener 202 is calculated by the following formula:

[0091] get:

[0092] It should be noted that, except for the bearing assembly 2, the rest of the structure in Embodiment 2 is exactly the same as that in Embodiment 1.

[0093] The present application provides the following advantages: (1) by burying bolts 4 in the desert geology 3, the bottom of the column 1 buried in the desert geology 3 is fixed by the bolts 4, which significantly increases the embedding effect of the column 1 in the soft desert geology 3; (2) two different structural connection methods between the semi-annular plate and the column 1 are given, and a force analysis is given. The size of the semi-annular plate and the model of the fastener 202 used can be determined by the formula of the force analysis.

[0094] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A desert flexible photovoltaic support, characterized in that: include: A column (1), the bottom of which is suitable for being buried in desert geology (3); A bolt (4) is arranged in the desert geology (3), and a portion of the bolt (4) is inserted into the column (1). The bolt (4) is used to improve the pull-out bearing capacity of the column (1).

2. The desert flexible photovoltaic support according to claim 1, characterized in that: The invention also comprises a bearing assembly (2), wherein the bearing assembly (2) is arranged on the top of the column (1), and the bearing assembly (2) comprises a fixing plate (204) and a fastening half ring (205), wherein the fastening half ring (205) is fixedly connected to the fixing plate (204), and a space is formed between the fastening half ring (205) and the fixing plate (204) to allow the flexible steel cable (5) to pass through.

3. The desert flexible photovoltaic support according to claim 2, characterized in that: The bearing assembly (2) further comprises two first semi-annular plates (201), the two first semi-annular plates (201) being enclosed on the outer circumference of the column (1) via fasteners (202), a supporting beam (203) being fixed on the outer circumference of the first semi-annular plates (201), and a fixing plate (204) being provided on the top of the supporting beam (203).

4. The desert flexible photovoltaic support according to claim 3, characterized in that: The concentrated force G1 transmitted by the flexible steel cable (5) borne by the supporting beam (203) is: G1 = μ·N...① Wherein, μ is the friction coefficient between the first semi-annular plate (201) and the column (1), and N is the contact pressure between the first semi-annular plate (201) and the column (1); N=σ N ·A……② Among them, σ N is the contact stress between the first semi-annular plate (201) and the surface of the column (1), and A is the contact area between the first semi-annular plate (201) and the surface of the column (1); A=π·D·H……③ Wherein, D is the outer diameter of the column (1), and H is the height of the first semi-annular plate (201); The first semi-annular plate (201) is in mechanical balance in the circumferential direction, that is, Substituting equations ② and ③ into ④, we get: T = G1 / (2μ·π)……⑤ Wherein, T is the pre-tightening force generated by the fastener (202) on the first semi-annular plate (201); The tensile stress generated in the cross section of the first semi-annular plate (201) is σ T , then: T = σ T ·t·H get: p T =T / (t·H)=G1 / (2μ·π·t·H).

5. The desert flexible photovoltaic support according to claim 4, characterized in that: The downward concentrated force generated by the flexible steel cable (5) at the supporting beam (203) is G1, and the bending moment at the connection is: M1=G1*L, wherein L is the distance between the force-bearing part of the supporting beam (203) and the connection part of the first semi-annular plate (201); The existence of the bending moment causes non-uniform stress to be generated in the cross section of the first semi-annular plate (201), and the maximum tensile stress generated at the edge of the first semi-annular plate (201) is: The maximum compressive stress is: Among them, W z is the cross-sectional resistance moment of the end surface of the first semi-annular plate (201); Since the entire first semi-annular plate (201) is also subjected to uniform pre-tightening tensile stress, the maximum tensile stress on the cross section of the first semi-annular plate (201) is: The maximum compressive stress is:

6. The desert flexible photovoltaic support according to claim 2, characterized in that: The bearing assembly (2) further comprises two second semi-annular plates (206), which are enclosed on the outer circumference of the column (1) via fasteners (202), a supporting plate (207) is fixed to the outer circumference of the second semi-annular plates (206), and a fixing plate (204) is provided on the top of the supporting plate (207).

7. The desert flexible photovoltaic support according to claim 6, characterized in that: It also includes a connecting diagonal rod (208) and two third semi-annular plates (209), one end of the connecting diagonal rod (208) is fixedly connected to the supporting plate (207), and the other end is fixedly connected to the third semi-annular plate (209), and the two third semi-annular plates (209) are enclosed on the outer peripheral surface of the column (1) through fasteners (202).

8. The desert flexible photovoltaic support according to claim 7, characterized in that: The angle between the connecting diagonal rod (208) and the supporting plate (207) is α1, the tensile force on the supporting plate (207) is F1=G1cotα1, and the compressive force on the connecting diagonal rod (208) is: F2=G1 / sinα1; The second semi-annular plate (206) is in mechanical balance in the circumferential direction, that is, the stress of the cross section of the second semi-annular plate (206) is: Wherein, t1 is the thickness of the second semi-annular plate (206), h1 is the height of the second semi-annular plate (206), and T1 is the pre-tightening force applied by the fastener (202) on the second semi-annular plate (206).

9. A photovoltaic support system, characterized in that: The invention comprises a desert flexible photovoltaic support as described in any one of claims 1-8.

10. The photovoltaic support system according to claim 9, characterized in that: It also comprises two flexible steel cables (5), and a plurality of photovoltaic modules (6) are arranged between the two flexible steel cables (5).

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