Auxiliary structure for reducing deflection of large-span flexible photovoltaic support and installation method

Abstract

The invention relates to an auxiliary structure for reducing the deflection of a large-span flexible photovoltaic support and an installation method, which are used for solving the problem of large deflection of a large-span inhaul cable. According to the device, two tripods with different elevations are adopted, the bottoms of the tripods are connected to transverse rods at the two ends through prestress stabilizing inhaul cables, so that the effect of stabilizing double cables for placing the photovoltaic panel and bearing loads is achieved, and the stabilizing device connects and fixes the tripods and the inhaul cables through small hoops. According to the technology, a stabilizing effect can be achieved for the double-cable flexible support structure, and the overall deflection of the inhaul cable is reduced. And the problem that the deflection of an original large-span prestress flexible inhaul cable is too large can be effectively solved.

Description

Technical Field

[0001] The invention relates to an auxiliary structure for reducing the deflection of a large-span flexible photovoltaic bracket and an installation method, belonging to the technical field of photovoltaic installation brackets. Background Art

[0002] As environmental issues become increasingly severe and demand for renewable energy grows, photovoltaic power generation, as a representative of clean energy, is gradually becoming mainstream. However, traditional photovoltaic power stations usually require a lot of land resources, and their rigid layout and high space occupancy rate limit their application flexibility and efficiency in complex terrain and site conditions. In order to overcome these challenges, photovoltaic flexible support technology has developed rapidly in recent years.

[0003] Photovoltaic flexible brackets are made of lightweight and flexible materials, with high adaptability, and can flexibly cope with different terrains and usage scenarios, thereby effectively improving the layout flexibility and energy efficiency of photovoltaic power stations. The development of this technology has brought innovation to the ground layout of photovoltaic power stations, making it possible to build photovoltaic power stations in complex places such as mountains, water surfaces, and urban spaces.

[0004] However, controlling the deflection of large-span photovoltaic flexible supports is a big problem in practical applications, especially in large-span flexible structures over 30 meters. The existing cable fixing mechanism can reduce the deflection of the cable, but when used in large-span flexible supports, the deflection is still too large.

[0005] Since the national standards do not have a complete inspection system for the deflection and span ratio of steel cables after the application of load combinations, and the international building codes do not stipulate deflection limits, when the deformation caused by the deflection on the cable has too much influence on the overall elongation of the cable, it will greatly increase safety hazards and risks.

[0006] Therefore, technical personnel in this field urgently need to solve the technical problem of large deflection of the cable under a single-span and large-span. Summary of the invention

[0007] Purpose: In order to overcome the deficiencies in the prior art, the present invention provides an auxiliary structure and installation method for reducing the deflection of a large-span flexible photovoltaic bracket, which is used to reduce the problem of large deflection of large-span cables. The device uses two tripods with different elevations, and the bottom is connected to the cross bars at both ends through prestressed stabilizing cables, so as to stabilize the double cables that place photovoltaic panels and bear loads. The stabilizing device connects and fixes the tripod to the cable through a small clamp. The invention technology can stabilize the double-cable flexible bracket structure and reduce the overall deflection of the cable. And it can effectively reduce the problem of excessive deflection of the original large-span prestressed flexible cable.

[0008] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is: In a first aspect, an auxiliary structure for reducing the deflection of a large-span flexible photovoltaic support includes: a column, an end beam, a prestressed cable, a stabilizing cable, and a tripod.

[0009] Wherein, the columns include a first column, a second column, a third column, and a fourth column. The end beams include a first end beam and a second end beam. The prestressed cables include a first cable and a second cable. The tripods include a first tripod, a second tripod, and a third tripod.

[0010] A first end beam is connected between the top ends of the first column and the second column, and a second end beam is connected between the top ends of the third column and the fourth column.

[0011] One end of the first cable is connected to the left end of the first end beam through an anchor, the other end of the first cable is connected to the left end of the second end beam through an anchor, one end of the second cable is connected to the right end of the first end beam through an anchor, and the other end of the second cable is connected to the right end of the second end beam through an anchor. One end of the stabilizing cable is connected to the middle of the first end beam through an anchor, and the other end of the stabilizing cable is connected to the middle of the second end beam through an anchor.

[0012] The three ends of the first tripod are respectively connected to 1 / 4 of the first cable, 1 / 4 of the second cable and 1 / 4 of the stabilizing cable; the three ends of the second tripod are respectively connected to 1 / 2 of the first cable, 1 / 2 of the second cable and 1 / 2 of the stabilizing cable; the three ends of the third tripod are respectively connected to 3 / 4 of the first cable, 3 / 4 of the second cable and 3 / 4 of the stabilizing cable.

[0013] As a preferred solution, the three ends of the first tripod are respectively connected to the first cable, the second cable and the stabilizing cable through hoops.

[0014] The three ends of the second tripod are respectively connected to the first cable, the second cable and the stabilizing cable through hoops.

[0015] The three ends of the third tripod are respectively connected to the first cable, the second cable and the stabilizing cable through hoops.

[0016] As a preferred solution, the tripod is made of angle steel by bolts or welding.

[0017] As a preferred solution, the clamp is made of high-strength steel sheets through a mold, and is connected to the tripod through bolts welded on the tripod and anti-loosening nuts.

[0018] As a preferred solution, a reinforcing rod is connected between the top end of the first column and the bottom end of the second column, and a reinforcing rod is connected between the top end of the third column and the bottom end of the fourth column.

[0019] As a preferred solution, the heights of the second tripod and the third tripod are greater than the height of the first tripod.

[0020] In a second aspect, a method for installing an auxiliary structure for reducing the deflection of a large-span flexible photovoltaic support comprises the following steps: Step 1: Use structural analysis software to model structural components and perform performance testing.

[0021] Step 2: Make engineering drawings of the structural device tested in the structural analysis software.

[0022] Step 3: Select the structural component materials of corresponding materials according to the drawings.

[0023] Step 4: Use a small clamp to fix the tripod to the original structural cable.

[0024] As a preferred solution, the method further includes step 5: connecting the tripod to the cross bars at both ends through prestressed cables via a clamp at the bottom of the tripod.

[0025] As a preferred solution, it also includes step 6: inspecting the structure according to the "Steel Structure Design Standard" and the "Cable Structure Technical Code".

[0026] As a preferred solution, the performance test described in step 1 specifically includes: The height of the tripod needs to be determined according to the span of the photovoltaic structure, and the range of values ​​is between 1 / 15 and 1 / 30. The design of the tripod needs to be high in the middle of the cable span and low at both ends.

[0027] The prestress value of the prestressed stabilizing cable under the tripod needs to be determined according to the load requirements of the photovoltaic structure in different regions. The value range should be determined according to the cable prestress design formula in the "Technical Code for Cable Structures".

[0028] It is necessary to compare the cable deflection of the analyzed model with the specification limit in the structural analysis software.

[0029] The stress ratio of the tripod in the analyzed model needs to be verified in the structural analysis software according to national standards, and the strength and stiffness of the tripod must comply with national regulations.

[0030] As a preferred option, the strength of the clamps and bolts must be verified before they can be installed into the original structure.

[0031] As a preferred solution, the method for obtaining the model of the angle steel of the tripod specifically includes: Determine the pre-selected angle steel cross-section model in the structural analysis software, and perform nonlinear finite element analysis based on the most unfavorable load combination preset in the structural analysis software. After the analysis is completed, perform stress ratio verification in the software according to the national steel structure specifications. When the stress value is less than 1, the pre-selected angle steel model passes the strength and stiffness verification.

[0032] As a preferred solution, the method for obtaining the value of the cable prestressing force specifically includes: Determine the design value of cable prestress in the structural analysis software. Based on the preset prestress value in the structural analysis software, prioritize the deflection of the cable under deadweight conditions after prestressing. When the deflection is less than 1 / 200 of the span, adopt nonlinear and large displacement analysis methods. After the analysis is completed, the cable can be used only when the axial force is less than the cable breaking tension limit.

[0033] Beneficial effects: The present invention provides an auxiliary structure and installation method for reducing the deflection of a large-span flexible photovoltaic bracket. The device is characterized in that a tripod made of angle steel is used in conjunction with prestressed cables, and the tripod is fixed to the original structural cables using small clamps, thereby stabilizing the original structure and effectively reducing the deflection.

[0034] The present invention can reduce the disturbance of prestressed cables by optimizing the structural design. On the basis of the original structural design, a small amount of steel is added and a reasonable structural design arrangement and installation of a structural stabilization device can be used to reduce the deflection of the cables, thereby achieving the goal of improving the overall stability of the structure.

[0035] The present invention solves the deflection problem, stability and safety of large-span photovoltaic flexible brackets, and can improve the application of photovoltaic flexible brackets in different terrain areas. The addition of a structural stabilization device can greatly reduce the deflection of prestressed cables under extreme load conditions and improve the safety of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is an overall schematic diagram of the auxiliary structure of the present invention for reducing the deflection of a large-span flexible photovoltaic support.

[0037] Figure 2 This is an enlarged schematic diagram of the connection between the prestressed cable or stabilizing cable and the end beam.

[0038] Figure 3 An enlarged schematic diagram of the connection between the prestressed cable or stabilizing cable and the tripod.

[0039] Figure 4 Schematic diagram of the analysis process of structural analysis software. DETAILED DESCRIPTION

[0040] The following is a clear and complete description of the technical solutions in the examples of the present invention in conjunction with the accompanying drawings in the examples of the present invention. Obviously, the described embodiments are only 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 protection scope of the present invention.

[0041] The present invention will be further described below in conjunction with specific embodiments.

[0042] Embodiment 1:

[0043] This embodiment introduces an auxiliary structure for reducing the deflection of a large-span flexible photovoltaic support. Figure 1 As shown, it includes: a column 1, an end beam 2, a prestressed cable 3, a stabilizing cable 4, and a tripod 5.

[0044] The column 1 includes a first column 101, a second column 102, a third column 103, and a fourth column 104. The end beam 2 includes a first end beam 201 and a second end beam 202. The prestressed cable 3 includes a first cable 301 and a second cable 302. The tripod 5 includes a first tripod 501, a second tripod 502, and a third tripod 503.

[0045] A first end beam 201 is connected between the top ends of the first column 101 and the second column 102 , and a second end beam 202 is connected between the top ends of the third column 103 and the fourth column 104 .

[0046] like Figure 2 As shown, one end of the first cable 301 is connected to the left end of the first end beam 201 through the anchor 7, the other end of the first cable 301 is connected to the left end of the second end beam 202 through the anchor 7, one end of the second cable 302 is connected to the right end of the first end beam 201 through the anchor 7, and the other end of the second cable 302 is connected to the right end of the second end beam 202 through the anchor 7. One end of the stabilizing cable 4 is connected to the middle of the first end beam 201 through the anchor 7, and the other end of the stabilizing cable 4 is connected to the middle of the second end beam 202 through the anchor 7.

[0047] The three ends of the first tripod 501 are respectively connected to 1 / 4 of the first cable 301, 1 / 4 of the second cable 302 and 1 / 4 of the stabilizing cable 4; the three ends of the second tripod 502 are respectively connected to 1 / 2 of the first cable 301, 1 / 2 of the second cable 302 and 1 / 2 of the stabilizing cable 4; the three ends of the third tripod 503 are respectively connected to 3 / 4 of the first cable 301, 3 / 4 of the second cable 302 and 3 / 4 of the stabilizing cable 4.

[0048] Further, such as Figure 3 As shown, the three ends of the first tripod 501 are connected to the first cable 301 , the second cable 302 and the stabilizing cable 4 through the clamp 8 .

[0049] The three ends of the second tripod 502 are connected to the first cable 301 , the second cable 302 and the stabilizing cable 4 through the clamp 8 .

[0050] The three ends of the third tripod 503 are connected to the first cable 301 , the second cable 302 and the stabilizing cable 4 through the clamp 8 .

[0051] Furthermore, the tripod 5 is made of angle steel by bolts or welding.

[0052] Furthermore, the hoop 8 is made of high-strength steel sheet through a mold, and is connected to the tripod through bolts welded on the tripod and a locking nut 9.

[0053] Furthermore, a reinforcing rod 6 is connected between the top end of the first column 101 and the bottom end of the second column 102 , and a reinforcing rod 6 is connected between the top end of the third column 103 and the bottom end of the fourth column 104 .

[0054] Furthermore, the heights of the second tripod 502 and the third tripod 503 are greater than the height of the first tripod 501 .

[0055] Embodiment 2:

[0056] This embodiment introduces a method for installing an auxiliary structure for reducing the deflection of a large-span flexible photovoltaic support, comprising the following steps: Step 1: Use structural analysis software to model structural components and perform performance testing.

[0057] Step 2: Make engineering drawings of the structural device tested in the structural analysis software.

[0058] Step 3: Select the structural component materials of corresponding materials according to the drawings.

[0059] Step 4: Use a small clamp to fix the tripod to the original structural cable.

[0060] The method also includes step 5: connecting the tripod to the cross bars at both ends through prestressed cables through a clamp at the bottom of the tripod.

[0061] It also includes step 6: accepting the structure according to the "Steel Structure Design Standard" and "Cable Structure Technical Code".

[0062] Furthermore, the performance test described in step 1 specifically includes: The height of the tripod needs to be determined according to the span of the photovoltaic structure, and the range of values ​​is between 1 / 15 and 1 / 30. The design of the tripod needs to be high in the middle of the cable span and low at both ends.

[0063] The prestress value of the prestressed stabilizing cable under the tripod needs to be determined according to the load requirements of the photovoltaic structure in different regions. The value range should be determined according to the cable prestress design formula in the "Technical Code for Cable Structures".

[0064] It is necessary to compare the cable deflection of the analyzed model with the specification limit in the structural analysis software.

[0065] The stress ratio of the tripod in the analyzed model needs to be verified in the structural analysis software according to national standards, and the strength and stiffness of the tripod must comply with national regulations.

[0066] Furthermore, the strength of the clamps and bolts needs to be verified before they can be installed into the original structure.

[0067] Furthermore, the method for obtaining the model of the angle steel of the tripod specifically includes: Determine the pre-selected angle steel cross-section model in the structural analysis software, and perform nonlinear finite element analysis based on the most unfavorable load combination preset in the structural analysis software. After the analysis is completed, perform stress ratio verification in the software according to the national steel structure specifications. When the stress value is less than 1, the pre-selected angle steel model passes the strength and stiffness verification.

[0068] Furthermore, the method for obtaining the value of the cable prestressing specifically includes: Determine the design value of cable prestress in the structural analysis software. Based on the preset prestress value in the structural analysis software, prioritize the deflection of the cable under deadweight conditions after prestressing. When the deflection is less than 1 / 200 of the span, adopt nonlinear and large displacement analysis methods. After the analysis is completed, the cable can be used only when the axial force is less than the cable breaking tension limit.

[0069] Embodiment 3:

[0070] This embodiment introduces a 31.6-meter long-span flexible bracket in a tea garden photovoltaic project, and combines the structural analysis software SAP2000 for structural optimization and implementation analysis. In this project, the diameter of the prestressed cable is 15.2 mm, the diameter of the longitudinal prestressed rod at both ends is 17.8 mm, and the cable strength is 1860MPa; the columns at both ends are P140x4 round steel pipes, the column diagonal brace model is P89x3 round steel pipes, and the end cross bar is P52x3 round steel pipe. The material strength is Q235B, and the structural components are connected by bolts. The size of the photovoltaic panel in this structure is 2278x1134x35 mm, the number is 27 pieces per span, and the inclination angle is 20 degrees. Below the photovoltaic panel is an agricultural planting area. In this embodiment, below the photovoltaic structure is a tea planting area. In the present invention, the existing photovoltaic structure project is used as an embodiment, and the following stabilizing component design and analysis are performed later.

[0071] Figure 4 This is a structural modeling analysis used in the structural analysis software SAP2000. The span of the structure is 31.648m. The elevation of the tripod is 1 / 25 on both sides and 1 / 20 in the middle of the span. The diameter of the cable is 15.2mm, and the prestress of the cable is 100kN. The angle steel model of the tripod is L50x50x6. The material of the tripod is 235B, and the strength of the cable is 1860MPa.

[0072] In this embodiment, the design value of the prestressed cable is based on the following formula:

[0073] Where: F is the tensile design value of the cable; is the standard value of the ultimate tensile strength of the cable; is the cable resistance partial coefficient. In this embodiment, the cable resistance partial coefficient is 2.0. The maximum tensile design value is 130 kN through calculation.

[0074] In the analysis software, according to the preset design limit value of the prestressed cable, the deformation value of the cable under the condition of deadweight after the prestress is applied is tested. Under this condition, the deflection shall not exceed 1 / 200 of the structural span. Only after passing this verification can the structural analysis be carried out. In this embodiment, the prestress value of the cable is 100kN.

[0075] During construction, install the small clamp at 1 / 4, 1 / 2, and 3 / 4 of the original cable span; install the designed tripods at the positions of the small clamps in the previous step, and the tripod height in the span must be higher than the other tripods; in the software structure analysis of this embodiment, the tripod value is 1 / 25 and 1 / 20 of the structure span, the tripod with an elevation of 1 / 20 of the structure span is set at 1 / 2 of the structure span, and the tripod with an elevation of 1 / 25 of the structure span is set at 1 / 4 and 3 / 4 of the structure span. It should be noted that the tripod elevation is the distance from the horizontal height of the tripod and the lower side of the original structure cable to the lowest point of the tripod bottom angle.

[0076] After the structural software analysis is completed, according to the cable deflection results fed back by the software, multiple experiments are conducted to reduce the cable deflection under different prestress values. Without exceeding the load limit of the steel components, the cable prestress value with the minimum cable deflection is taken as the optimal solution. Then, according to the design value in the structural analysis software, the original structure on site is verified and the construction is optimized.

[0077] According to the feedback from the analysis software, in the original structure, the maximum prestress design value was applied to the cable, and the deflection of the cable under the ultimate load combination was 697.285 mm, far exceeding the design value limit of the deflection of the structure of 632 mm; after adding the tripod to optimize the stabilizing component, when the prestress value was 100 kN, the deflection of the cable under the ultimate load combination was 282.12 mm; when the prestress value was 110 kN, the deflection of the cable under the ultimate load combination was 257.43 mm; when the prestress value was 120 kN, the deflection of the cable under the ultimate load combination was 236.56 mm, far below the design value limit of the deflection of the structure of 632 mm. After adding the stabilizing cable, the deflection of the prestressed cable was significantly optimized.

[0078] The end crossbars in the two end support structures are replaced with crossbars with cable anchors. The end crossbars with prestressed cable anchors should be end crossbars with cable anchors. In this embodiment, the original crossbar component is shown in the software to be able to bear the load brought by the stabilizing cable after the structural optimization.

[0079] After the cable is prestressed, it is connected to the cross bars at both ends through the small clamp at the bottom of the tripod, and the acceptance is finally completed. The acceptance method should be based on the provisions of the "Technical Regulations for Cable Structures", and the strength, deflection, deformation value, and connection node construction methods and construction results should be accepted, which must fully comply with the acceptance regulations described in the national standards.

[0080] In the present invention, if there are terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the directions or positional relationships in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in combination with the drawings and based on the specific circumstances on site.

[0081] Unless otherwise specified, in this patent, the terms "set", "connected" and "connected" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0082] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An auxiliary structure for reducing the deflection of a large-span flexible photovoltaic support, characterized in that: include: Columns, end beams, prestressed cables, stabilizing cables, tripods; Wherein, the columns include a first column, a second column, a third column, and a fourth column; the end beams include a first end beam and a second end beam; the prestressed cables include a first cable and a second cable; the tripods include a first tripod, a second tripod, and a third tripod; A first end beam is connected between the top ends of the first column and the second column, and a second end beam is connected between the top ends of the third column and the fourth column; One end of the first cable is connected to the left end of the first end beam through an anchor, the other end of the first cable is connected to the left end of the second end beam through an anchor, one end of the second cable is connected to the right end of the first end beam through an anchor, and the other end of the second cable is connected to the right end of the second end beam through an anchor; one end of the stabilizing cable is connected to the middle part of the first end beam through an anchor, and the other end of the stabilizing cable is connected to the middle part of the second end beam through an anchor; The three ends of the first tripod are respectively connected to 1 / 4 of the first cable, 1 / 4 of the second cable and 1 / 4 of the stabilizing cable; the three ends of the second tripod are respectively connected to 1 / 2 of the first cable, 1 / 2 of the second cable and 1 / 2 of the stabilizing cable; the three ends of the third tripod are respectively connected to 3 / 4 of the first cable, 3 / 4 of the second cable and 3 / 4 of the stabilizing cable.

2. The auxiliary structure for reducing the deflection of a large-span flexible photovoltaic support according to claim 1, characterized in that: The three ends of the first tripod are connected to the first cable, the second cable and the stabilizing cable through a hoop respectively; the three ends of the second tripod are connected to the first cable, the second cable and the stabilizing cable through a hoop respectively; the three ends of the third tripod are connected to the first cable, the second cable and the stabilizing cable through a hoop respectively.

3. According to claim 2, an auxiliary structure and installation method for reducing the deflection of a large-span flexible photovoltaic support, characterized in that: The clamp is made of a high-strength steel sheet through a mold, and is connected to the tripod through bolts welded on the tripod and anti-loosening nuts.

4. A method for installing an auxiliary structure for reducing the deflection of a large-span flexible photovoltaic support according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Use structural analysis software to model structural components and perform performance testing; Step 2: Make engineering drawings of the structural device tested in the structural analysis software; Step 3: Select the structural component materials of corresponding materials according to the drawings; Step 4: Use a small clamp to fix the tripod to the original structural cable.

5. The installation method according to claim 4, characterized in that: The method also includes step 5: connecting the tripod to the cross bars at both ends through prestressed cables through a clamp at the bottom of the tripod.

6. The installation method according to claim 5, characterized in that: It also includes step 6: accepting the structure according to the "Steel Structure Design Standard" and "Cable Structure Technical Code".

7. The installation method according to any one of claims 4 to 6, characterized in that: The performance test specifically includes: The tripod height should be determined according to the span of the photovoltaic structure, ranging from 1 / 15 to 1 / 30. The tripod should be designed with the middle of the cable span high and the tripods at both ends low. The prestress value of the prestressed stabilizing cable under the tripod needs to be determined according to the load requirements of the photovoltaic structure in different regions. The value range should be determined according to the cable prestress design formula in the "Cable Structure Technical Code"; The cable deflection of the analyzed model needs to be compared with the code limit in the structural analysis software; The stress ratio of the tripod in the analyzed model needs to be verified in the structural analysis software according to national standards, and the strength and stiffness of the tripod must comply with national regulations.

8. The installation method according to claim 5, characterized in that: The strength of the clamps and bolts must be verified before they can be installed into the original structure.

9. The installation method according to claim 5, characterized in that: The method for obtaining the model of the angle steel of the tripod specifically comprises: Determine the pre-selected angle steel cross-section model in the structural analysis software, and perform nonlinear finite element analysis based on the most unfavorable load combination preset in the structural analysis software. After the analysis is completed, perform stress ratio verification in the software according to the national steel structure specifications. When the stress value is less than 1, the pre-selected angle steel model passes the strength and stiffness verification.

10. The installation method according to claim 5, characterized in that: The method for obtaining the value of the cable prestress specifically includes: Determine the design value of cable prestress in the structural analysis software. Based on the preset prestress value in the structural analysis software, prioritize the deflection of the cable under deadweight conditions after prestressing. When the deflection is less than 1 / 200 of the span, adopt nonlinear and large displacement analysis methods. After the analysis is completed, the cable can be used only when the axial force is less than the cable breaking tension limit.

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