Weathering steel support and mounting method thereof

Abstract

The invention discloses a weathering steel support and an installation method thereof, and belongs to the technical field of photovoltaic supports. The mounting method of the weathering steel support comprises the following steps that preparation before mounting is completed, and a pile foundation is fixed at a preset mounting position on the ground; mounting of a front stand column, a rear stand column, a cross arm and a plurality of hoops is completed; the assembled structure is arranged on the pile foundation in a sleeving mode through a plurality of hoops, and the cross arm is located at the top of the pile foundation; a front inclined strut, a rear inclined strut and an inclined beam are installed, one end of the front inclined strut and one end of the rear inclined strut are connected with the two ends of the inclined beam respectively, the other end of the front inclined strut and the other end of the rear inclined strut are connected with the two ends of the lowermost hoop respectively, the middle of the inclined beam is connected with the top end of the front stand column and the top end of the rear stand column respectively, and connection is achieved through preset connecting holes and bolt structures. Through the standardized installation process and scientific procedure design, the safety, precision and efficiency of support installation are ensured, welding is not needed, and fireless, rapid and adjustable connection of the support and the pile foundation is achieved.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic support technology, specifically relating to a weathering steel support and its installation method. Background Technology

[0002] Weathering steel, as a high-performance structural material, is gradually demonstrating its unique application value in the field of photovoltaic (PV) supports. This low-alloy steel, falling between ordinary steel and stainless steel, forms a dense and stable protective rust layer in the atmosphere by adding alloying elements such as copper, chromium, and nickel to ordinary carbon steel. This effectively prevents corrosive media from penetrating the substrate, and its atmospheric corrosion resistance is 2 to 8 times that of ordinary carbon steel. This characteristic makes weathering steel particularly suitable for support structures in large-scale ground-mounted PV power plants and distributed rooftop PV systems that are exposed to the outdoor environment for extended periods, meeting the requirement of a PV system service life of over 25 years.

[0003] Despite the significant advantages of weathering steel, its actual installation in photovoltaic (PV) systems faces severe challenges. The currently prevalent on-site welding process fundamentally contradicts the material properties of weathering steel: the high-temperature electric arc generated during welding severely damages the crucial protective rust layer on the surface, significantly weakening its inherent corrosion resistance. Furthermore, as an alloy steel, the alloying elements in weathering steel complicate the welding process, easily leading to increased weld defect rates, reduced joint strength, and difficulty in guaranteeing corrosion resistance in the weld area. In addition, traditional welding installation methods themselves suffer from problems such as poor process coordination, difficulty in controlling structural positioning accuracy, and low construction efficiency. These factors collectively restrict the full realization of the advantages of weathering steel in PV system applications. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems and provide a weathering steel bracket and its installation method, which avoids damage to the protective rust layer on the surface of the weathering steel during the welding process, thereby maintaining the anti-corrosion properties of the material and improving the long-term stability and reliability of the bracket in harsh environments.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for installing a weathering steel bracket, comprising the following steps: S1. Complete the pre-installation preparations and fix the pile foundation at the preset installation position on the ground; S2. Assemble the front column, rear column, crossarm, and multiple clamps, so that the two ends of the crossarm and each clamp are connected to the front column and the rear column respectively, wherein the rear column is higher than the front column, the crossarm is located above the clamps, and the connection is achieved through a preset connection hole and bolt structure. S3. The structure assembled in step S2 is fitted onto the pile foundation using the multiple clamps, so that the crossarm is located at the top of the pile foundation; S4. Install the front diagonal brace, rear diagonal brace, and diagonal beam, so that one end of the front diagonal brace and the rear diagonal brace are respectively connected to the two ends of the diagonal beam, and the other end of the front diagonal brace and the rear diagonal brace are respectively connected to the two ends of the lowest clamp. The middle part of the diagonal beam is respectively connected to the top of the front column and the rear column, and the connection is achieved through a preset connection hole and bolt structure.

[0006] A further improvement of the present invention is that, in step S1, the pre-installation preparation includes checking the flatness of the foundation and the verticality or positional accuracy of the pile foundation.

[0007] A further improvement of the present invention is that, in S2, both the front column and the rear column are provided with a plurality of vertically arranged connecting holes for adjusting the position of the crossarm.

[0008] A further improvement of the present invention is that, in S2, the clamp, crossarm and front column and rear column are pre-connected by the bolt structure, and the bolt structure is in an untightened state.

[0009] A further improvement of the present invention is that, in step S3, the overall height of the bracket is adjusted by adjusting the position of the crossbeam in the connecting hole, and all bolts are tightened after the height adjustment is completed.

[0010] A further improvement of the present invention is that, when adjusting the connection position of the crossarm, the supports corresponding to different pile foundations are at the same height by pulling a horizontal line.

[0011] A further improvement of the present invention is that, in S2, the connection between the clamp, the crossbeam and the front column and the rear column is made of M14×70 bolts; in S4, the connection between the front diagonal brace, the rear diagonal brace and the clamp is made of M14×70 bolts; the connection between the front diagonal brace, the rear diagonal brace and the inclined beam is made of M12×40 bolts; and the connection between the front column, the rear column and the inclined beam is made of M12×40 bolts.

[0012] A further improvement of the present invention is that, after S4, when it is necessary to install photovoltaic panels, for two adjacent supports, tie rods are set at the intersection of the inclined beams of the two supports to connect the two supports, then purlins and purlin brackets are installed, and finally photovoltaic panels are installed above the purlins, purlin brackets and tie rods.

[0013] A further improvement of the present invention is that the tie rods are arranged in a cross manner between the inclined beams of the two supports.

[0014] Secondly, the present invention also provides a weathering steel bracket, which is obtained by the above-described installation method.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides an installation method for weathering steel supports. The all-bolted connection process effectively avoids the damage to the protective rust layer on the surface of the weathering steel caused by high welding temperatures, enabling the supports to be used stably for a long time in harsh environments such as the Gobi Desert and wilderness. The modular, step-by-step assembly strategy of this method involves pre-assembling the front and rear columns, crossbeams, and clamps on the ground, then fitting the entire assembly onto the pile foundation, and finally installing the diagonal braces and beams. This not only reduces the risks of high-altitude operations but also significantly improves installation accuracy and efficiency through pre-set connection holes and a step-by-step adjustment mechanism, reducing the difficulty of on-site adjustments. Simultaneously, the bolted connection avoids the adverse effects of welding on the alloy composition of the weathering steel, ensuring the consistency of node strength with the base material and solving the technical problems of easy cracking and poor corrosion resistance of welds in weathering steel. Furthermore, the flexible cooperation between the clamps and the pile foundation can absorb foundation construction errors, enhancing adaptability to complex terrain. The all-bolted structure facilitates later maintenance or expansion, balancing construction convenience and life-cycle economics, providing reliable support for the large-scale application of weathering steel supports in photovoltaic power plants.

[0016] Furthermore, the clamps, crossarms, front columns, and rear columns are pre-connected by the bolt structure, and the bolt structure is in an untightened state. Since the bolt structure is in an untightened state, when it is necessary to adjust the overall height of the bracket, the operator can directly move the crossarm to the position of the target connection hole without using additional tools to loosen the bolts.

[0017] Furthermore, the overall height of the bracket is adjusted by adjusting the position of the crossbeam in the connecting holes. After the height adjustment is completed, all bolts are tightened immediately to secure all components. This method not only solves the problem of bracket wobbling or displacement during height adjustment but also avoids the inability to make fine adjustments due to pre-tightening bolts, achieving an efficient, precise, and safe installation process.

[0018] Furthermore, the tie rods are arranged in a crisscross pattern between the inclined beams of the two supports, forming a mutually supporting geometric configuration. This configuration allows the tie rods to automatically calibrate the relative positions of the two supports during installation, providing a precise horizontal reference for subsequent photovoltaic panel installation. Simultaneously, under wind loads or vibration conditions, the crisscrossed tie rods maintain the dynamic balance of the connection points, effectively preventing cumulative deformation of the support system. Attached Figure Description

[0019] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components of the invention.

[0020] Figure 1 This is a schematic flowchart of the weathering steel bracket installation method of the present invention; Figure 2 This is an installation diagram corresponding to step S2 of the present invention; Figure 3 This is an installation diagram corresponding to step S4 of the present invention; Figure 4 This is an installation diagram corresponding to step S5 of the present invention.

[0021] The components include: 1. Pile foundation; 2. Front column; 3. Rear column; 4. Hoop; 5. Crossbeam; 6. Connecting hole; 7. Bolt structure; 8. Front diagonal brace; 9. Rear diagonal brace; 10. Inclined beam; 11. Tie rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, 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 orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings: like Figures 1 to 4 As shown, the present invention provides a method for installing a weathering steel bracket, comprising the following steps: S1. Complete the pre-installation preparations and fix the pile foundation 1 at the preset installation position on the ground; S2. Assemble the front column 2, rear column 3, crossbeam 5 and multiple clamps 4, so that the two ends of the crossbeam 5 and each clamp 4 are connected to the front column 2 and the rear column 3 respectively, wherein the rear column 3 is higher than the front column 2, the crossbeam 5 is located above the clamp 4, and the connection is achieved through the preset connection hole 6 and bolt structure 7. S3. The structure assembled in step S2 is fitted onto the pile foundation 1 using the multiple clamps 4, so that the crossbeam 5 is located at the top of the pile foundation 1; S4. Install the front diagonal brace 8, the rear diagonal brace 9, and the diagonal beam 10, so that one end of the front diagonal brace 8 and the rear diagonal brace 9 are respectively connected to the two ends of the diagonal beam 10, the other end of the front diagonal brace 8 and the rear diagonal brace 9 are respectively connected to the two ends of the lowest clamp 4, and the middle part of the diagonal beam 10 is respectively connected to the top of the front column 2 and the rear column 3, and the connection is achieved through the preset connection hole 6 and the bolt structure 7.

[0029] In some embodiments, pre-installation preparation includes checking the flatness of the foundation and the verticality or positional accuracy of the pile foundation 1. This is mainly to ensure the levelness of the installation surface and prevent the support structure from tilting due to ground undulations, thereby providing a basic guarantee for subsequent adjustment of the position of the crossarm 5. The pile foundation 1 can be fixed by driving or grouting, depending on geological conditions and the availability of construction equipment.

[0030] Specifically, adding checks on the flatness of the foundation and the accuracy of pile 1 during the pre-installation preparation stage effectively solves installation accuracy problems caused by substandard foundation conditions. Checking the flatness of the foundation ensures that the installation surface is level, which is crucial for subsequent height consistency adjustments of the supports corresponding to different piles 1 by using a horizontal line, as uneven ground directly interferes with the accuracy of setting the horizontal line and adjusting the height. Simultaneously, checking the verticality or positional accuracy of pile 1 provides a stable support foundation for the supports. Especially when weathering steel supports use bolted connections instead of welding, insufficient accuracy of pile 1 will increase the difficulty of aligning the connection holes 6 and increase the structural stress after the bolt structure 7 is pre-tightened, thus affecting overall stability and long-term durability. These inspection measures work together to identify and correct foundation defects in advance, ensuring the accuracy of the installation process and the safe and reliable operation of the system.

[0031] In some embodiments, both the front column 2 and the rear column 3 are pre-installed with multiple vertically arranged connecting holes 6 for adjusting the position of the crossarm 5. These multiple vertically arranged connecting holes 6 refer to a series of through holes opened along the height direction on the front column 2 and the rear column 3, designed to provide flexible height selection for the crossarm 5. These connecting holes 6 can be formed by machining methods, such as drilling or stamping, ensuring that the hole diameter and spacing meet design requirements. Specifically, the crossarm 5 refers to the lateral support member used to connect the front column 2 and the rear column 3. Its position adjustment function is achieved by selecting different connecting holes 6, thereby adapting to uneven foundations or differences in pile foundation height 1. This design avoids the height fixation problem caused by a single connecting hole 6, allowing the support system to remain horizontal under different terrain conditions. Furthermore, the design of multiple connecting holes 6 also supports horizontal alignment operations, compensating for height differences by precisely selecting the position of the connecting holes 6, thereby ensuring the overall consistency of multiple supports. This method not only improves the controllability of the installation process but also enhances the overall stability of the support system, while avoiding the impact of welding processes on the performance of weathering steel.

[0032] In some embodiments, the clamp 4, crossarm 5, front column 2, and rear column 3 are pre-connected via the bolt structure 7, and the bolt structure 7 is in a loose state. During assembly, after the clamp 4, crossarm 5, front column 2, and rear column 3 are pre-connected via the bolt structure 7, they form an integral structure, which facilitates the subsequent installation of the pile foundation 1. Because the bolt structure 7 is loose, when the overall height of the support needs to be adjusted, the operator can directly move the crossarm 5 to the position of the target connection hole 6 without using additional tools to loosen the bolts. This design not only simplifies the height adjustment process but also avoids installation delays and accuracy deviations caused by repeatedly loosening the bolts.

[0033] In some embodiments, the overall height of the bracket is adjusted by adjusting the position of the crossbeam 5 in the connecting hole 6, and all bolts 7 are tightened after the height adjustment is completed. This adjustment method directly affects the key load-bearing components of the bracket, ensuring the accuracy and consistency of the height adjustment. Simultaneously, the feature of tightening all bolts 7 after the height adjustment effectively prevents accidental displacement or vibration caused by loose bolts, thus maintaining the adjustment results and improving the stability of the bracket.

[0034] Specifically, this method employs a sequential design of adjustment followed by fixing. First, the assembled structure is fitted onto the pile foundation 1 using multiple clamps 4, with the bolts 7 loose at this stage to facilitate height adjustment. Then, a horizontal line is used to ensure that the supports corresponding to different pile foundations 1 are at the same height. Once the height adjustment is complete, all bolts 7 are immediately tightened to securely fix the components. This method not only solves the problem of swaying or displacement of the supports during height adjustment but also avoids the inability to fine-tune due to premature bolt tightening, achieving an efficient, precise, and safe installation process.

[0035] In some embodiments, when adjusting the connection position of the crossarm 5, a horizontal line is used to ensure that the supports corresponding to different pile foundations 1 are at the same height. This method not only simplifies the on-site operation process but also lays a reliable foundation for the subsequent flat laying of photovoltaic panels, reducing the risk of rework caused by inconsistent heights.

[0036] In some embodiments, the connection between the clamp 4, crossarm 5 and the front column 2 and rear column 3 uses M14×70 bolts; in S4, the connection between the front diagonal brace 8, rear diagonal brace 9 and the clamp 4 uses M14×70 bolts; the connection between the front diagonal brace 8, rear diagonal brace 9 and the inclined beam 10 uses M12×40 bolts; and the connection between the front column 2, rear column 3 and the inclined beam 10 uses M12×40 bolts. M14×70 bolts are used for the connection between the clamp 4, crossarm 5 and the front column 2, rear column 3, and the front diagonal brace 8, rear diagonal brace 9 and the clamp 4. These parts, as the main load-bearing structures of the support, need to withstand large vertical loads and lateral stresses. Therefore, using larger bolt sizes can effectively improve the connection strength and prevent loosening or deformation due to load concentration. M12×40 bolts are used for the connection between the front diagonal brace 8, rear diagonal brace 9 and the inclined beam 10, and the connection between the front column 2, rear column 3 and the inclined beam 10. These parts are subjected to relatively small forces and require frequent adjustments. Therefore, using smaller bolts not only simplifies the installation process but also reduces the difficulty of construction, while ensuring the flexibility and precision control of the connection points.

[0037] In some embodiments, when photovoltaic panels need to be installed, for two adjacent supports, tie rods 11 are intersected by the inclined beams 10 of the two supports to connect the two supports, then purlins and purlin brackets are installed, and finally the photovoltaic panels are installed above the purlins, purlin brackets, and tie rods. The tie rods 11 are intersected between the inclined beams 10 of the two supports. After the main support structure is installed, the intersecting tie rods 11 between the inclined beams 10 of adjacent supports can effectively improve the wind load resistance of the overall structure. This design makes full use of the geometric advantages of the inclined beams 10 as existing structural components, achieving a stable connection without additional foundation structures. The subsequently installed purlins and purlin brackets are positioned more accurately due to the additional lateral support provided by the tie rods 11, reducing the time spent on repeated adjustments. Finally, when installing photovoltaic panels above the purlins, purlin brackets, and tie rods, the tie rods 11 serve as auxiliary support points, further optimizing the stress distribution of the photovoltaic panels, avoiding excessive local stress, and thus ensuring long-term operational stability and deformation resistance. The design of the entire process not only improves installation efficiency but also significantly enhances the overall integrity and reliability of the system, solving the problem of insufficient structural stability caused by the lack of a lateral connection mechanism. Simultaneously, under wind loads or vibration environments, the cross-connected tie rods 11 can maintain the dynamic balance of the connection points, effectively preventing cumulative deformation of the support system.

[0038] like Figures 2 to 4As shown, the present invention also provides a weathering steel support frame, which is obtained by the above-described installation method. The weathering steel support frame includes a pile foundation 1, a front column 2, a rear column 3, clamps 4, a crossbeam 5, a front diagonal brace 8, a rear diagonal brace 9, and a diagonal beam 10. Several clamps 4 are provided, spaced apart and fitted onto the pile foundation 1. The crossbeam 5 is located above the clamps 4 and contacts the top of the pile foundation 1, with its two ends connected to the front column 2 and the rear column 3, respectively. The height of the rear column 3 is greater than the height of the front column 2. One end of the front diagonal brace 8 and the rear diagonal brace 9 are connected to both ends of the diagonal beam 10, and the other end is connected to both ends of the lowest clamp 4, respectively. The middle part of the diagonal beam 10 is connected to the top of the front column 2 and the rear column 3. All components are detachably connected through pre-set connection holes 6 and bolt structures 7.

[0039] In summary, the installation method for weathering steel supports provided by this invention ensures the safety, accuracy, and efficiency of support installation through standardized installation procedures and scientific process design. Moreover, it eliminates the need for welding, achieving a fireless, rapid, and adjustable connection between the support and the pile foundation.

[0040] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

[0041] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection of the present invention as defined by the submitted claims.

Claims

1. A method for installing a weathering steel bracket, characterized in that, Includes the following steps: S1. Complete the pre-installation preparations and fix the pile foundation at the preset installation position on the ground (1). S2. Assemble the front column (2), rear column (3), crossbeam (5) and multiple clamps (4), so that the two ends of the crossbeam (5) and each clamp (4) are connected to the front column (2) and the rear column (3) respectively, wherein the rear column (3) is higher than the front column (2), the crossbeam (5) is located above the clamp (4), and the connection is achieved through the preset connection hole (6) and bolt structure (7); S3. The structure assembled in step S2 is fitted onto the pile foundation (1) using the multiple clamps (4), so that the crossbeam (5) is located at the top of the pile foundation (1); S4. Install the front diagonal brace (8), the rear diagonal brace (9) and the inclined beam (10), so that one end of the front diagonal brace (8) and the rear diagonal brace (9) are respectively connected to the two ends of the inclined beam (10), and the other end of the front diagonal brace (8) and the rear diagonal brace (9) are respectively connected to the two ends of the lowest clamp (4). The middle part of the inclined beam (10) is respectively connected to the top of the front column (2) and the rear column (3), and the connection is achieved through the preset connection hole (6) and bolt structure (7).

2. The installation method of a weathering steel bracket according to claim 1, characterized in that, In S1, the pre-installation preparation includes checking the flatness of the foundation and the verticality or positional accuracy of the pile foundation (1).

3. The installation method of a weathering steel bracket according to claim 1, characterized in that, In S2, both the front column (2) and the rear column (3) are pre-set with multiple vertically arranged connecting holes (6) for adjusting the position of the crossbeam (5).

4. The installation method of a weathering steel bracket according to claim 1, characterized in that, In S2, the clamp (4), crossbeam (5), front column (2), and rear column (3) are pre-connected by the bolt structure (7), and the bolt structure (7) is in an untightened state.

5. The installation method of a weathering steel bracket according to claim 1, characterized in that, In S3, the overall height of the bracket is adjusted by adjusting the position of the crossarm (5) in the connecting hole (6), and all bolts (7) are tightened after the height adjustment is completed.

6. The installation method of a weathering steel bracket according to claim 5, characterized in that, When adjusting the connection position of the crossarm (5), the supports corresponding to different pile foundations (1) are at the same height by pulling a horizontal line.

7. The installation method of a weathering steel bracket according to claim 1, characterized in that, In S2, the connection between the clamp (4), the crossbeam (5) and the front column (2) and the rear column (3) is made of M14×70 bolts; in S4, the connection between the front diagonal brace (8), the rear diagonal brace (9) and the clamp (4) is made of M14×70 bolts; the connection between the front diagonal brace (8), the rear diagonal brace (9) and the inclined beam (10) is made of M12×40 bolts; and the connection between the front column (2), the rear column (3) and the inclined beam (10) is made of M12×40 bolts.

8. The installation method of a weathering steel bracket according to claim 1, characterized in that, Following S4, when photovoltaic panels need to be installed, for two adjacent supports, tie rods (11) are set at intersections of the inclined beams (10) of the two supports to connect the two supports, then purlins and purlin brackets are installed, and finally photovoltaic panels are installed above the purlins, purlin brackets and tie rods.

9. The installation method of a weathering steel bracket according to claim 8, characterized in that, The tie rod (11) is arranged in a cross manner between the inclined beams (10) of the two supports.

10. A weathering steel support, characterized in that, The installation method described in any one of claims 1 to 9 is used.

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