How can steel structures be used for lightning protection?
Electrical designers should pay attention to quoting standard practices. The grid size of the lightning arrester should be strictly corresponding to the requirements of the specifications and the categories of lightning protection of various buildings, and the construction drawings shall be marked accurately according to the standard divided by the standard. From the point of view of structural specialty, the thickness of the roof panel is generally taken into account three factors: the first is wind load; second is snow load; the third is friction distance. Therefore, different regions may choose the roof panel thickness is not the same, electrical designers need to communicate with structural professionals in a timely manner, the thickness of the specification to meet the requirements, and then assess other conditions. In Xinjiang, for example. Purlin spacing is about 1.5m, the roof panel thickness is 0.6mm, base plate thickness is 0.5mm, is to meet the requirements of standard thickness.
The enclosure system of light steel structure building is non combustible, and the thickness shall not be less than 0.5mm when the metal plate is used as the flash arrester. Specifications for the metal plate under the presence of flammable materials in different circumstances, the thickness of the metal plate made different requirements, clearly defined: "metal plate below no flammable products, the thickness shall not be less than 0.5mm."". Let's take a look at the physical properties of the four core insulation materials. Rigid polyurethane is B1 grade building materials, the thermal conductivity is 0.016~0.025, as a flame retardant; flame retardant polystyrene material, the oxygen index of not less than 30, the coefficient of thermal conductivity is 0.029, as the flame retardant self extinguishing type rock wool; do not belong to the burning material, the thermal conductivity is 0.044; glass wool is a building material, the thermal conductivity is 0.038~0.042, for non combustible. In addition, insulation core material used is flame retardant adhesive. Third of the four requirements in the specification are no longer considered.
The connection system of light steel structure building is usually occlusal or lap joint. Both the profiled steel sheet and the sandwich panel are corrugated in appearance. In construction, the lap length at lap time shall reach at least one wave crest or trough, and over 100mm will fully meet the requirements of the specification.
