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2. When the width of a flat-roofed house with a parapet is less than 24m, it is only necessary to lay a lightning protection strip along the wall of the daughter; when the width is greater than 24m, a surface-mounted connection strip shall be installed between the two lightning protection strips on the surface of the house. When the spacing between the strips is not more than 20m, install the lightning protection strips only on the eaves; when the width is more than 20m, install the surface-mounted connection strips on the roof, and the spacing between the connection strips should not exceed 20m. Mobile lightning rod installation lightning protection belt (network) Note 3, tile roof surface slope of 27 ° -35 °, the length does not exceed 75m, only laid along the ridge lightning protection zone. For the four-pitch roofed houses, lightning protection strips should be installed on each ridge. In order to protect the horns, short lightning rods should be installed on the corners of the houses or the deflectors should be taken off the horns. If the height of the eaves is higher than 12m and the length is greater than 75m, lightning protection strips should be laid on the roof and eaves.
4. When the roof area is very large, a metal grid, ie a lightning protection net, shall be laid. Lightning nets are clear nets and dark nets. The denser the grid is, the better the reliability is. The density of the grid depends on the degree of importance of the buildings. Important buildings use 5′-5m dense grids, and general buildings use 20′20m. Grid can be. Mobile lightning rod installation lightning protection belt (network) Note: In the non-concrete structure of the building can be installed with lightning protection network.
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Mobile lightning rod installation lightning protection belt (network) Precautions 1, lightning protection belt and its connection line through the settling trench (subsidence trench: a long multi-storey building, often divided into several sections in the horizontal direction, paragraph and paragraph When there is a gap left to prevent the inconsistency of each segment, causing damage to the building, a crossover line with an expansion margin of 10-20 cm or more shall be provided.