How to choose the main materials of grid structure?

How to select the main materials in grid structure
1. Steel pipe: Q235B steel in GB700 shall be selected, its quality shall comply with the provisions of current national standard carbon structural steel GB700-88, and shall have the qualification guarantee of tensile strength, elongation, yield strength (or yield point), sulfur, phosphorus, carbon content and cold bending test. The steel pipe of grid structure shall be in strict accordance with the following links, such as blanking number, welding, coating, inspection, etc.

2. High strength bolt: it shall comply with grade 10.9 of high strength large hexagon head bolts for steel structures (gb1228-91) and GB / t16939 of "high strength bolts for bolt ball joints of steel grid". 40Cr in gb3077 shall be selected. Quenching crack is not allowed in any depth or length of the finished product. The surface strength shall reach hrc32-36. The thread shall comply with the tolerance and fit of common thread (GB 197) The surface should be blackened and coated with antirust oil.
3. Steel ball: the bolt ball is made of 45 steel in technical conditions for high quality carbon structural steel (gb699).
4. Cone head: Q235B steel forging is selected.
5. No grain nut: Q235B steel forgings are selected, and 45 steel forgings are used when the high strength hole diameter is more than 30.
6. Q235B steel is used for support, support and its connecting parts.

All the above materials are processed products in the factory, so we should choose the well-known grid frame and accessories manufacturer, and the grid structure construction site only needs to assemble, hoist, weld and surface treat the above materials. (for details, please refer to the steel structure "how to achieve thermal insulation for grid structure?"? 》Related matters)
For a grid company, professional grid installation and processing is very important, which will bring the advantages of quality and safety. According to the characteristics of grid processing, the grid itself is light in weight, high in strength and small in floor area. In the process of installation, manual combination is required, and professional personnel are not required for construction operation, so the installation is very convenient.
Grid structure engineering has a wide range of applications, with good ventilation conditions, convenient disassembly, and strong span. Generally, the shape of the grid can be seen in stadium buildings and factory buildings. It is a more practical building profile, with high stress, compression resistance, wind resistance and other characteristics. It has been well used for grid engineering.
For the general grid construction, the splicing methods generally used include integral splicing method, integral lifting method and hoisting method. For the grid company, different splicing methods should be adopted according to the construction requirements of the project, and the effect will be very obvious.
The company's main business: high strength bolt, high strength nut, steel structure bolt, steel structure nut, grid sealing plate, grid bolt, etc.