At present, due to the simple structure and small volume of the solar photovoltaic support structure, most of the selected steel materials are mainly light structural steel and small section ordinary steel structural steel.
Lightweight structural steels: Lightweight structural steels mainly refer to round steel, small angle steel and thin-walled steel. Among them, when the angle steel is used as a supporting member, the strength of the steel material can be better utilized, and the installation of the entire bracket is facilitated. However, when the angle steel is used as a bending and compressing member, the generated deformation is relatively large. At present, the angle steel of the national standard is relatively small compared to the solar energy bracket. Therefore, more small angle steel models are needed to adapt to the rapidly developing solar energy market. The thin-walled steel girder components generally use thin steel plates with a wall thickness of 1.5 to 5 mm, and are made into thin-walled steel products of various cross-sectional forms and sizes after being cold-formed or cold-rolled.
Compared with hot-rolled section steels, in the case of the same cross-sectional area, the radius of gyration of the thin-wall section steel can be increased by 50-60%, and the moment of inertia of the section and the moment of resistance can be increased by 0.5-3 times, so that the materials can be reasonably used. The strength, but because the processing of thin-walled steel is mostly in the factory, the need for high-precision drilling can be matched with the screw hole behind the photovoltaic panel. After the factory processes the drill, it can be galvanized and rust-proof; when it is transported to the site for installation, due to the small steel section, the tool is difficult to operate and the construction is difficult. At present, most of the battery panels in China cannot be directly connected to thin-walled steel, and they all require other auxiliary fixing structures (such as briquetting, etc.).
Ordinary steel structural steel: Ordinary structural steel often uses carbon structural steel or low alloy steel that is easy to smelt, and has low cost. There are many kinds of cross sections. The commonly used photovoltaic includes I-shaped, H-shaped, L-shaped and various design requirements. Profiled section. The processing methods are also various. Among them, the welded steel is made of steel plates with different thicknesses, and the steel is processed and welded in the factory according to the design requirements. This molding method can be calculated according to the force of different structural parts of the photovoltaic engineering project and taken differently in different locations. The thickness of the steel plate is more reasonable than that of the hot-rolled one-step molded product, which is more suitable for on-site installation and can also save steel materials.