Structure and method for reducing steel consumption of single-stand-column photovoltaic support steel column

Abstract

The invention provides a structure and method for reducing the steel consumption of a single-stand-column photovoltaic support steel column, and belongs to the technical field of photovoltaic support design. The structure comprises a cast-in-place pile, a steel column, an inclined strut, an inclined beam, a purline and a photovoltaic assembly; the steel column comprises a lower stand column and an upper stand column arranged above the lower stand column, and the installation position of the steel column is arranged outside the center of the photovoltaic module in a bias mode and coincides with the vertical projection of at least one row of purlines. Through the offset design, the bending moment of the column bottom is reduced by 20%-50%, the stability of the steel column is improved, and the deformation risk is reduced; after the column bottom bending moment is reduced, the section of the steel column can be optimized and reduced, and the steel consumption is reduced by 20-30%, so that the material cost is reduced; meanwhile, after the column bottom bending moment is reduced, the pile foundation bearing requirement is lowered, the size or depth of the cast-in-place pile can be reduced, the use amount of concrete is reduced, and therefore the construction cost is saved by 15%-25%.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic support design technology, and in particular relates to a structure and method for reducing the amount of steel used in a single-column photovoltaic support. Background Technology

[0002] For some mountainous projects or engineering geological conditions with hard geology, only the steel-framed concrete cast-in-place pile + steel column scheme can be selected. The load center point of the tall column is high above the ground, the bending moment at the column base is large, and the steel column uses a large amount of steel, accounting for a large proportion of the total steel consumption.

[0003] How to reduce steel consumption and improve the structural stability of photovoltaic supports has become an urgent problem to be solved in the development of composite photovoltaics.

[0004] like Figure 1 As shown, a typical single-column photovoltaic (PV) support system includes cast-in-place piles, a lower column, an upper column, diagonal braces, diagonal beams, purlins, and PV modules. The main load is wind load, with its center of action coinciding with the steel column, which is subjected to tensile or compressive bending. The formula for calculating the bending moment at the column base under wind load is:

[0005] At wind pressure: M 常规 =F×sinα×h

[0006] When the air is being drawn in: M 常规 =-F×sinα×h

[0007] Where F is the wind load, α is the wind direction angle, and h is the height of the load center. This design results in an excessively high proportion of steel used in the steel columns to the total steel used in the support structure, increasing costs and affecting stability. Summary of the Invention

[0008] This invention addresses the problems of excessive steel consumption and large bending moments at the base of traditional single-column photovoltaic (PV) supports. It provides a structure and method for reducing the steel consumption of the steel column in a single-column PV support, thereby reducing the bending moment at the base of the column and the amount of steel used, improving both economic efficiency and structural performance.

[0009] The technical solution adopted by the present invention, which discloses a structure and method for reducing the steel consumption of a single-column photovoltaic support, is as follows:

[0010] A structure for reducing the amount of steel used in a single-column photovoltaic support steel column includes cast-in-place piles, steel columns, diagonal braces, diagonal beams, purlins, and photovoltaic modules; the steel column includes a lower column and an upper column disposed above the lower column, and the installation position of the steel column is offset outside the center of the photovoltaic module and coincides with the vertical projection of at least one row of purlins.

[0011] A further improvement of the above technical solution of the present invention is that the top of the upper column is connected to the inclined beam and the purlin simultaneously by a set of shared bolts.

[0012] A further improvement of the above technical solution of the present invention is that the installation torque of the shared bolt is 50 N·m–80 N·m.

[0013] A further improvement of the above technical solution of the present invention is that the diagonal brace is inclinedly connected between the steel column and the inclined beam to form a triangular support structure.

[0014] A further improvement of the above technical solution of the present invention is that the diameter of the cast-in-place pile is 0.3m–0.5m and the depth is 2m–6m.

[0015] A method for reducing the amount of steel used in a single-column photovoltaic support column, using the above-mentioned structure, includes the following steps:

[0016] S1. Install the steel column at an offset position so that it coincides with the vertical projection of the purlin;

[0017] S2. Secure the steel columns, inclined beams, and purlins simultaneously using shared bolts;

[0018] S3. Configure diagonal bracing to connect the steel column and the inclined beam.

[0019] A further improvement of the above technical solution of the present invention is that: the bending moment at the base of the steel column under wind pressure is...

[0020] M=F×sinα×hF×cosα×L

[0021] Where L is the horizontal offset distance between the center of the wind load and the steel column, and L>0.

[0022] A further improvement of the above technical solution of the present invention is that: the bending moment at the base of the steel column under wind suction conditions is...

[0023] M=-F×sinα×h+F×cosα×L

[0024] Where L is the horizontal offset distance between the center of the wind load and the steel column, and L>0.

[0025] A further improvement of the above technical solution of the present invention is that the value range of the horizontal offset distance L is 0.3m–1.5m.

[0026] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0027] This invention reduces the column base bending moment by 20%-50% through offset design, improving the stability of steel columns and reducing the risk of deformation. After the column base bending moment is reduced, the steel column cross-section can be optimized and reduced, and the amount of steel used can be reduced by 20%-30%, thereby reducing material costs. At the same time, the pile foundation bearing requirements are reduced after the column base bending moment is reduced, and the size or depth of cast-in-place piles can be reduced, reducing the amount of concrete used, thereby saving 15%-25% of construction costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a traditional single-column photovoltaic support system.

[0029] Figure 2 This is a schematic diagram of a structure that reduces the amount of steel used in a single-column photovoltaic support column, provided by the present invention.

[0030] In the attached diagram: 1. Cast-in-place pile; 2. Lower column; 3. Upper column; 4. Diagonal brace; 5. Diagonal beam; 6. Purlin; 7. Photovoltaic module. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. In the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of this invention.

[0032] This invention provides a structure that reduces the steel consumption of a single-column photovoltaic support column. The structure includes cast-in-place piles, a steel column (composed of a lower column 2 and an upper column 3), diagonal braces 4, diagonal beams 5, purlins 6, and photovoltaic modules 7. The steel column is offset outside the center of the photovoltaic module 7 and coincides with the vertical projection of at least one row of purlins 6, forming an asymmetrical layout to counteract wind load bending moments.

[0033] refer to Figure 2 It can be seen that the top of the upper column 3 is aligned with the second row of purlins 6, and the wind load center is offset horizontally from the steel column by a distance L; the diagonal brace 4 connects the steel column and the inclined beam 5 at an angle, forming a triangular support; the steel column is synchronously fixed to the inclined beam 5 and the purlin 6 by a set of shared high-strength bolts, with a bolt installation torque of 50 N·m–80 N·m. This structure is particularly suitable for composite photovoltaic projects, where the lowest edge of the photovoltaic module is 1.5m–5m above the ground.

[0034] The present invention also provides a method for reducing the amount of steel used in a single-column photovoltaic support column, comprising the following steps:

[0035] S1. Install the steel column at an offset position so that it coincides with the vertical projection of the purlin 6;

[0036] S2. Secure the steel column, inclined beam 5, and purlin 6 simultaneously using shared bolts;

[0037] S3, Configure diagonal bracing 4 to connect the steel column and the diagonal beam 5.

[0038] Among them, the bending moment at the base of the steel column under wind pressure is:

[0039] M=F×sinα×hF×cosα×L

[0040] The bending moment at the base of the steel column under wind suction conditions is...

[0041] M=-F×sinα×h+F×cosα×L

[0042] Where L is the horizontal offset distance between the center of the wind load and the steel column, and L>0, while the value of the horizontal offset distance L ranges from 0.3m to 1.5m.

[0043] Specifically, the geological conditions are first measured on-site (mountainous or hard geological conditions preferred) to determine the location of pile 1. The pile diameter is 0.3m–0.5m, and the depth is 2m–6m. The bearing capacity is calculated according to GB 50007-2011 "Code for Design of Building Foundations". The concrete strength grade is C30, and the lower column 2 is installed after 7 days of curing.

[0044] Then, the lower column 2 and upper column 3 are installed with an offset, ensuring that the centerline of the steel column coincides with the vertical projection of the second row of purlins 6. The horizontal offset distance L is set to 0.3m–1.5m, with the specific value based on the photovoltaic module size optimization: for example, when the module width is 2.278m, L = 0.46m is taken to maximize the reduction of bending moment. The steel column material is Q355B or Q420B steel, and the cross-sectional dimensions are calculated based on bending moment optimization (e.g., ).

[0045] Then, using a set of M12 high-strength bolts (meeting GB / T 1231 standard), with the installation torque controlled at 60 N·m, the steel column, inclined beam 5, and purlin 6 are connected simultaneously. The bolts are tightened in one go, reducing independent installation points. Inclined beam 5 is U-shaped steel, and purlin 6 is C-shaped steel; the connection points are coated with an anti-rust coating.

[0046] Then install diagonal bracing 4 at an angle of 30°–60°, and weld or bolt it between the steel column and the inclined beam 5. Next, install the photovoltaic modules 7, ensuring the offset distance L between the module center and the steel column remains stable. Conduct wind load tests to verify structural stability.

[0047] Example 1

[0048] In this embodiment, the diameter of the cast-in-place pile 1 is 0.3m, the depth is 3m, and the lower column 2 is fixed; the photovoltaic module 7 has an inclination angle of 30° and a center height of 3.5m. The L of the photovoltaic module 7 is 0.5m, and the width of the photovoltaic module 7 is 2.4m, which coincides with the projection of the purlin 6. The inclination angle of the diagonal brace 4 is 50°.

[0049] Effect verification

[0050] Column base bending moment calculation: The wind suction effect of the photovoltaic support is greater than the wind pressure effect. Under wind suction conditions, the column base bending moment is:

[0051] M=-F×sinα×3.5+F×cosα×L=-8×sin30°×3.5+8×cos30°×0.5=-14+3.47=-10.53Kn.m

[0052] Conventional design column base bending moment calculation: M=-F×sinα×h=-8×sin30°×3.5=-14Kn.m.

[0053] Compared with conventional design, the present invention reduces the bending moment at the bottom of the column by about 25%, while reducing the amount of steel used in the steel column by 21% and the amount of cast-in-place pile work by 17%.

[0054] In the above embodiments, the present invention provides a structure and method for reducing the amount of steel used in a single-column photovoltaic support steel column. The present invention reduces the bending moment at the column base by 20%-50% through offset design, thereby improving the stability of the steel column and reducing the risk of deformation. After the bending moment at the column base is reduced, the cross-section of the steel column can be optimized and reduced, reducing the amount of steel used by 20%-30%, thereby reducing material costs. At the same time, after the bending moment at the column base is reduced, the bearing requirements of the pile foundation are reduced, and the size or depth of the cast-in-place pile can be reduced, reducing the amount of concrete used, thereby saving 15%-25% of construction costs.

[0055] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the inventive concept should fall within the protection scope of the present invention. All technical contents for which protection is sought in this invention are fully described in the claims.

Claims

1. A structure for reducing the amount of steel used in a single-column photovoltaic support column, characterized in that: It includes cast-in-place piles (1), steel columns, diagonal braces (4), diagonal beams (5), purlins (6) and photovoltaic modules (7); the steel columns include a lower column (2) and an upper column (3) set above the lower column (2), and the installation position of the steel columns is offset outside the center of the photovoltaic modules (7) and coincides with the vertical projection of at least one row of purlins (6).

2. The structure for reducing the steel consumption of a single-column photovoltaic support column according to claim 1, characterized in that: The top of the upper column (3) is connected to the inclined beam (5) and the purlin (6) simultaneously by a set of shared bolts.

3. The structure for reducing the steel consumption of a single-column photovoltaic support column according to claim 2, characterized in that: The installation torque of the shared bolt is 50 N·m–80 N·m.

4. The structure for reducing the steel consumption of a single-column photovoltaic support column according to claim 1, characterized in that: The diagonal brace (4) is inclinedly connected between the steel column and the inclined beam (5) to form a triangular support structure.

5. The structure for reducing the steel consumption of a single-column photovoltaic support column according to claim 1, characterized in that: The diameter of the cast-in-place pile (1) is 0.3m–0.5m and the depth is 2m–6m.

6. A method for reducing the amount of steel used in a single-column photovoltaic support column, characterized in that: Using the structure according to any one of claims 1-4 includes the following steps: S1. Install the steel column at an offset position so that it coincides with the vertical projection of the purlin (6); S2. The steel column, inclined beam (5) and purlin (6) are simultaneously fixed by shared bolts; S3. Configure diagonal bracing (4) to connect the steel column and the inclined beam (5).

7. The method for reducing the amount of steel used in a single-column photovoltaic support according to claim 6, characterized in that: The bending moment at the base of the steel column under wind pressure is... M=F×sinα×hF×cosα×L Where L is the horizontal offset distance between the center of the wind load and the steel column, and L>0.

8. The method for reducing the amount of steel used in a single-column photovoltaic support according to claim 7, characterized in that: The bending moment at the base of the steel column under wind suction conditions is... M=-F×sinα×h+F×cosα×L Where L is the horizontal offset distance between the center of the wind load and the steel column, and L>0.

9. A method for reducing the amount of steel used in a single-column photovoltaic support according to claim 8, characterized in that: The horizontal offset distance L ranges from 0.3m to 1.5m.

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