Cold-formed thin-walled profile steel photovoltaic support structure with anti-torsion supporting rod

Abstract

The invention relates to the field of photovoltaic supports, and particularly discloses a cold-formed thin-walled steel photovoltaic support structure with an anti-torsion supporting rod, which comprises a purline assembly, a plurality of groups of anti-torsion supporting pieces, an overhanging section tensioning piece, an in-span tensioning piece and a support assembly, the multiple sets of anti-torsion supporting pieces are arranged in the span and cantilever sections of the purlines and used for providing lateral support for the purlines and limiting torsion of the purlines, the cantilever section tensioning pieces are used for limiting mutual dislocation between the purlines, the span inner tensioning pieces are used for reducing the weak axis bending moment borne by the purlines, and the support assembly is used for supporting the purline assembly from the lower portion. The system is high in assembly degree and convenient to connect; purline torsion can be effectively limited, the purline calculation length is reduced, and the thin-wall steel strength utilization rate is increased; a good bearing effect is achieved on longitudinal and transverse loads; the restraining effect on purline deformation is high, and the rigidity of a photovoltaic support system is remarkably improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic brackets, and in particular to a cold-bent thin-walled steel photovoltaic bracket structure with anti-torsion braces. Background Art

[0002] In the photovoltaic support structure, the purlin is the part with the largest proportion of steel, and cold-bent thin-walled steel is often used as the purlin component. As the strength of steel increases, the purlin steel becomes thinner and thinner, and the stable bearing capacity of the purlin is significantly reduced. According to experimental research, the load value calculated according to the bearing capacity formula in the specification GB 50018 does not meet the purlin deflection requirements, and the strength of high-strength steel is not fully utilized. Therefore, it is necessary to improve the photovoltaic support structure system, provide sufficient constraints for the purlin, improve the utilization rate of the purlin steel strength, and enable the purlin to bear load stably.

[0003] At present, round steel braces are generally set between purlins and cross braces are set between spans. However, round steel braces do not have the function of limiting the torsion of purlins and cannot be used as ideal lateral supports. The cross braces between spans are not effective in reducing the weak axis bending moment of purlins. The wind load on photovoltaic brackets can be decomposed into wind loads in two directions, along the axial direction of the purlins and perpendicular to the axial direction of the purlins, respectively called longitudinal wind loads and transverse wind loads. Under the action of longitudinal wind loads, the photovoltaic bracket structure may be dislocated between purlins, making the stiffness of the purlin system fail to meet the design expectations. Summary of the invention

[0004] In order to improve the problem of insufficient stable bearing capacity of the purlin system in the existing photovoltaic support structure, the present application provides a cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces.

[0005] The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces provided in this application adopts the following technical solution: A cold-bent thin-walled steel photovoltaic support structure with a torsion-resistant brace, comprising: A purlin assembly, comprising four purlins arranged in parallel; A plurality of groups of torsion-resistant supports are arranged in the span and cantilever section of the purlins to provide lateral support for the purlins and limit the torsion of the purlins; each group of the torsion-resistant supports comprises a plurality of torsion-resistant braces arranged in a straight line, and each torsion-resistant brace is installed between two adjacent purlins; The cantilever section tensioning member is arranged between two purlins in the middle of the cantilever section to limit the mutual displacement between the purlins; The inner span tensioning member is arranged between two purlins on both sides of the span to reduce the weak axis bending moment of the purlin; The support assembly is used to support the purlin assembly from below.

[0006] Furthermore, the purlins are cold-bent thin-walled steel components.

[0007] Furthermore, the torsion brace is a C-shaped steel or a Z-shaped steel, the flanges at both ends of the C-shaped steel or the Z-shaped steel are longer than the web, the web at the end of the torsion brace abuts against the purlin, the purlin is embedded between the two flanges at the end of the torsion brace, and the two flanges at the end of the torsion brace are respectively fixedly connected to the two flanges of the purlin.

[0008] The torsion brace serves as the lateral support of the purlin, which limits the torsion of the purlin, delays the instability of the purlin, and improves the utilization efficiency of the strength of the cold-bent thin-walled steel purlin.

[0009] Furthermore, the anti-torsion supports in each span are arranged in one group, two groups or three groups.

[0010] The more anti-torsion supports are set in the span, the better the stability of the purlin. In order to take into account both the stability of the purlin and the amount of steel used, it is advisable to set two sets of anti-torsion supports in each span.

[0011] Furthermore, the support assembly includes a vertically arranged pile and an inclined beam fixedly arranged on the top of the pile, the torsion-resistant brace is parallel to the inclined beam, and the purlin is fixedly connected to the inclined beam.

[0012] Furthermore, the in-span tensioning member includes an in-span tie rod, which is arranged along the diagonal direction in a rectangular frame composed of a torsional brace, an oblique beam and two purlins, and is used to transfer the weak axis load to the oblique beam to reduce the weak axis bending moment exerted on the purlin.

[0013] The coordinated action of the span braces and diagonal beams converts the weak-axis load on the purlins into the axial force of the purlins and diagonal beams, reducing the weak-axis bending moment on the purlins and improving the ability of the purlins to bear lateral wind loads.

[0014] Furthermore, the cantilever section tensioning member includes two cantilever section tensioning bars arranged in a cross shape.

[0015] The cantilever section brace uses a smaller amount of steel to limit the mutual displacement between the purlins when the photovoltaic support structure is subjected to longitudinal wind loads, thereby improving the ability of the photovoltaic support structure to resist longitudinal wind loads.

[0016] Under the action of torsion-resistant struts, cantilever section tie rods and span tie rods, the bearing capacity of the photovoltaic support structure is greatly improved and the structural rigidity is strengthened.

[0017] Furthermore, the cantilever section tie rods and the inner span tie rods are round steels with threads at both ends, and the ends of the round steels penetrate the webs of the purlins and are threadedly connected with nuts.

[0018] Furthermore, an angle steel support is provided on the outer side of the purlin web, the round steel penetrates the angle steel support, and the nut abuts against the outer side of the angle steel support, so that the cantilever section tie rod and the inner span tie rod transmit force in a straight line.

[0019] The use of round steel helps to reduce the total amount of steel used in the structure. During installation, the cantilever section tie rods and the inner span tie rods are tightened along their own length directions. At this time, the nuts abut against the outside of the angle steel supports, so that the cantilever section tie rods and the inner span tie rods transmit force along straight lines respectively, avoiding squeezing and deformation of the purlin web when tightening the nuts.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. The photovoltaic support structure provided in this application has a high degree of assembly and is easy to connect; 2. The torsion brace can effectively limit the torsion of the purlin, reduce the calculated length of the purlin, and improve the utilization rate of the strength of the cold-bent thin-walled steel components. The demonstration project shows that this system can reduce the steel consumption of the purlin by 36.0% and the total steel consumption of the structure by 17.5%; 3. The inner-span tie rod transfers the weak axis load to the inclined beam, reduces the weak axis bending moment of the purlin, and improves the load-bearing capacity of the purlin; the cantilever section tie rod can limit the mutual displacement between the purlins when the photovoltaic support structure is subjected to the longitudinal wind load, avoid the change of the stress state, and improve the rigidity of the photovoltaic support structure; 4. The photovoltaic support structure provided in this application has good bearing effects on both longitudinal and lateral loads. Field tests show that under the same load level, the purlin deflection using this structural system is more than 30.0% smaller than that of the conventional photovoltaic support system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a schematic diagram of a top view of the structure of an embodiment of the present application; Figure 3 This is a schematic diagram of the installation of the torsion brace in the embodiment of the present application; Figure 4 It is a schematic diagram of the installation of the cantilever section tie rods and the inner span tie rods in the embodiment of the present application.

[0022] Figure numerals: 1. torsion-resistant brace; 2. cantilever section tie rod; 3. inner span tie rod; 4. purlin; 5. pile; 6. hoop; 7. diagonal beam; 8. diagonal brace; 9. vertical rod; 10. bolt; 11. angle steel support. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-4 This application is described in further detail.

[0024] The present application embodiment discloses a cold-bent thin-walled steel photovoltaic support structure with a torsion-resistant brace. Figure 1 and Figure 2 The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces includes a purlin assembly, a support assembly, multiple groups of torsion-resistant supports, cantilever section tensioning members, and span tensioning members. The purlin assembly includes four parallel purlins 4, and the purlin 4 is a cold-bent thin-walled steel member.

[0025] Reference Figure 1 The support assembly is consistent with the traditional photovoltaic support structure, and is used to support the purlin assembly from below, including piles 5, diagonal braces 8, diagonal beams 7, clamps 6 and vertical rods 9. Among them, the piles 5 are vertically arranged, the diagonal beams 7 are installed on the top of the piles 5, and the purlins 4 are fixedly connected to the diagonal beams 7; the part of the purlins 4 located between two adjacent piles 5 is the inner span section, and the two ends of the purlins 4 are cantilever sections. The clamps 6 are sleeved on the piles 5, the diagonal braces 8 are inclined, and their two ends are hinged to the clamps 6 and the diagonal beams 7 respectively, and the vertical rods 9 are vertically arranged, and their two ends are hinged to the clamps 6 and the diagonal beams 7 respectively.

[0026] Reference Figure 1 and Figure 2 , multiple groups of torsion-resistant supports are respectively arranged in the span and cantilever section of the purlin 4, for providing lateral support for the purlin 4 and limiting the torsion of the purlin 4. Each group of torsion-resistant supports includes multiple torsion-resistant braces 1 arranged in a straight line, each torsion-resistant brace 1 is installed between two adjacent purlins 4; the torsion-resistant brace 1 is parallel to the diagonal beam 7. The torsion-resistant supports in each span are arranged in one group, two groups or three groups, and the torsion-resistant supports in the cantilever section are arranged in one group and located at the end of the purlin 4; in this embodiment, the torsion-resistant supports in each span are arranged in two groups.

[0027] Further, the torsion brace 1 is a C-shaped steel or a Z-shaped steel. Figure 3 The torsion brace 1 of this embodiment is made of C-shaped steel. When manufacturing, the webs at both ends of the C-shaped steel are cut off, and the flanges are retained, so that the flanges at both ends of the torsion brace 1 are longer than the webs. The webs at the ends of the torsion brace 1 are abutted against the sides of the purlin 4, and the purlin 4 is clamped between the two flanges at the ends of the torsion brace 1. The two flanges at the ends of the torsion brace 1 are respectively connected to the two flanges of the purlin 4 by bolts 10.

[0028] The torsion brace 1 serves as a lateral support for the purlin 4 , limits the torsion of the purlin 4 , delays the instability of the purlin 4 , and improves the utilization efficiency of the strength of the cold-bent thin-walled steel purlin 4 .

[0029] The design value of the purlin bending bearing capacity can be calculated according to the following formula in the current specification GB 50018.

[0030]

[0031] In formulas (1) to (4), Mx 、M y are the bending moments about the principal axes x and y of the cross section, φ bx is the overall stability factor of the flexural member, W ex is the effective section modulus of the compression edge about the principal axis x of the section, W ey is the effective section modulus of the compression edge of the section principal axis y-axis, f is the design strength of the component material, A is the cross-sectional area of ​​the component, h is the height of the component section, λ y is the slenderness ratio of the beam outside the plane of bending moment, ξ 1 , 2 are coefficients obtained by looking up the table, η and ζ are intermediate quantities, and f y is the yield strength of the component material, I t is the torsional inertia moment of the cross section, e a is the load eccentricity moment, I ω is the gross section moment of inertia of the component, I y is the moment of inertia of the gross section about the y-axis, I t is the torsional moment of inertia, l 0 Calculate the length for the lateral direction of the beam.

[0032] In formula (5), μ b is the lateral calculation length coefficient of the beam, and l is the span of the beam. When there is no torsion support in the span of the purlin, μ b =1.00; when a set of torsion-resistant supports is set within the span, μ b =0.50; when two sets of torsion-resistant supports are set in the span, μ b =0.33; when three sets of torsion-resistant supports are set in the span, μ b =0.25. The more anti-torsion supports are set in the span, the better the stability of the purlin. In order to take into account the stability of the purlin and the amount of steel used, it is advisable to set two sets of anti-torsion supports in each span.

[0033] For the cantilever section, when no torsion brace is provided, the cantilever purlin can rotate freely, the stability is poor, and its equivalent lateral calculation length coefficient is greater than 2.00; after adding torsion brace at the cantilever end, the torsion of the cantilever purlin is constrained, and the stability coefficient can be calculated as a simply supported beam, and its μ b =1.00.

[0034] Reference Figure 1 and Figure 2 The in-span tensioning members include an in-span tie rod 3, which is arranged between two purlins 4 on both sides of the span. The in-span tie rod 3 is arranged along the diagonal direction in a rectangular frame composed of a torsional brace 1, an inclined beam 7 and two purlins 4, and is used to transfer the weak axis load to the inclined beam 7 to reduce the weak axis bending moment of the purlin 4, thereby improving the ability of the purlin 4 to bear the lateral wind load.

[0035] Further, refer to Figure 1 and Figure 2 The cantilever section tensioning member includes two cantilever section braces 2 arranged in a cross shape, and the cantilever section braces 2 are arranged between two purlins 4 located in the middle of the cantilever section in the horizontal direction. The cantilever section braces 2 can limit the mutual displacement between the purlins 4 when the photovoltaic support structure is subjected to longitudinal wind loads by using a smaller amount of steel, thereby improving the ability of the photovoltaic support structure to resist longitudinal wind loads.

[0036] With the coordinated action of the torsion-resistant brace 1, the cantilever section tie rod 2 and the inner span tie rod 3, the photovoltaic support structure reduces the steel consumption while greatly improving the bearing capacity and strengthening the structural rigidity.

[0037] Reference Figure 4 The cantilever section brace 2 and the span inner brace 3 are both round steel with threads at both ends, and the ends of the round steel penetrate the web of the purlin 4 and are threadedly connected with nuts. Furthermore, an angle steel support 11 is provided on the outside of the web of the purlin 4, and the round steel penetrates the angle steel support 11. When the nut is tightened, it abuts against the outside of the angle steel support 11, so that the cantilever section brace 2 and the span inner brace 3 transmit force along the straight line in their own length direction, thereby avoiding squeezing and deforming the web of the purlin 4 when the nut is tightened.

[0038] In order to avoid installation stress caused by structural deformation due to installing the tie rods first, during installation, the torsion support rods 1 are first installed on the purlins 4 to determine the relative positions of the components of the photovoltaic support structure, and then the cantilever section tie rods 2 and the inner span tie rods 3 are installed and tightened.

[0039] The implementation principle of a cold-bent thin-walled steel photovoltaic support structure with anti-torsion struts in the embodiment of the present application is as follows: the anti-torsion struts 1 are used to limit the torsion of the purlins 4, reduce the calculated length of the purlins 4, and improve the utilization rate of the strength of the cold-bent thin-walled steel components; the inner-span tension rods 3 transfer the weak-axis load to the inclined beam 7, reduce the weak-axis bending moment of the purlins 4, and improve the load-bearing capacity of the purlins 4; the cantilever section tension rods 2 can limit the mutual displacement between the purlins 4 when the photovoltaic support structure is subjected to longitudinal wind loads, avoid changes in the stress state, and improve the stiffness of the photovoltaic support structure; under the synergistic effect of the anti-torsion struts 1, the cantilever section tension rods 2 and the inner-span tension rods 3, the photovoltaic support structure provided by the present application has a good bearing effect on both longitudinal and transverse loads while reducing the amount of steel used.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces, characterized in that: include: A purlin assembly, comprising four purlins arranged in parallel; A plurality of groups of torsion-resistant supports are arranged in the span and cantilever section of the purlins to provide lateral support for the purlins and limit the torsion of the purlins; each group of the torsion-resistant supports comprises a plurality of torsion-resistant braces arranged in a straight line, and each torsion-resistant brace is installed between two adjacent purlins; The cantilever section tensioning member is arranged between two purlins in the middle of the cantilever section to limit the mutual displacement between the purlins; The inner span tensioning member is arranged between two purlins on both sides of the span to reduce the weak axis bending moment of the purlin; The support assembly is used to support the purlin assembly from below.

2. The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces according to claim 1 is characterized in that: The torsion-resistant brace is a C-shaped steel or a Z-shaped steel, the flanges at both ends of the C-shaped steel or the Z-shaped steel are longer than the web, the web at the end of the torsion-resistant brace abuts against the purlin, the purlin is embedded between the two flanges at the end of the torsion-resistant brace, and the two flanges at the end of the torsion-resistant brace are respectively fixedly connected to the two flanges of the purlin.

3. The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces according to claim 1 is characterized in that: The anti-torsion supports in each span are arranged in one group, two groups or three groups.

4. The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces according to claim 1 is characterized in that: The support assembly comprises a vertically arranged pile and an inclined beam fixedly arranged on the top of the pile, the torsion-resistant brace is parallel to the inclined beam, and the purlin is fixedly connected to the inclined beam.

5. The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces according to claim 4 is characterized in that: The in-span tensioning member includes an in-span tie rod, which is arranged along the diagonal direction in a rectangular frame composed of a torsion brace, an oblique beam and two purlins, and is used to transfer the weak axis load to the oblique beam to reduce the weak axis bending moment on the purlin.

6. The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces according to claim 5 is characterized in that: The cantilever section tensioning member comprises two cantilever section tensioning bars arranged in a cross shape.

7. The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces according to claim 6 is characterized in that: The cantilever section tie rod and the inner span tie rod are both round steel with threads at both ends, and the ends of the round steel penetrate the web of the purlin and are threadedly connected with nuts.

8. The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces according to claim 7 is characterized in that: An angle steel support is arranged on the outer side of the purlin web, the round steel penetrates through the angle steel support, and the nut abuts against the outer side of the angle steel support, so that the cantilever section tie rod and the inner span tie rod transmit force in a straight line.

9. The cold-bent thin-walled steel photovoltaic support structure with torsion-resistant braces according to claim 1, characterized in that: The purlins are cold-bent thin-walled steel components.

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