New building external lightning protection program

1. Grounding equipment grounding (metal conductors embedded in soil or in concrete foundations as diffused metal conductors) Under normal circumstances, the steel bars in the reinforced concrete foundation of a building should be fully used as lightning protection grounding devices. When it is impossible to use its reinforced concrete foundation as its Grounding devices should be laid around the perimeter of the building into a ring of artificial grounding devices.

2. Lead wire (metal conductors connecting the lightning receptor and the grounding device)

The deflectors shall be arranged evenly or symmetrically along the perimeter of the building, and shall be grounded with the shortest and straightest path. The distance between the down conductors of the first type of lightning protection structures shall not be greater than 12m; the second type shall not exceed 18m; Should not exceed 25m. The two diagonal main reinforcements in the building structure column can be directly used as the lightning down conductor, and the upper end is connected with the lightning receiving device (lightning protection zone, mesh, and needle), and the lower end is connected with the grounding device by welding. Intermediate links should use short-circuit rings using stirrups (at least one per floor).

3. The high-rise buildings with equal-pressure rings should be classified according to their importance, the nature of their use, and the possibility and consequences of a lightning accident. When the height exceeds the critical height (30m, 45m and 60m for the first, second and third types of lightning protection structures, respectively), protective measures against side-impingement and equal potential shall be taken.

(4) Air-termination devices (lightning conductors that directly intercept lightning strikes, lightning protection grids, lightning rods, and metal roofing and metal components used as lightning receptors, etc.)

Installation of lightning protection belts and lightning protection grids: The lightning protection belts are installed on the outside of the building roof (or the top of the parapet wall) (not more than 15cm away from the outer edge of the building), the roof of the roofing ladder, the surrounding of the pool top, and the ridges, corners, eaves and Corners, etc. that are easily struck by lightning. The lightning protection grid should be welded by using roof bars. All the grids should be connected with the nearest ring beam reinforcement or lightning protection zone. Structures such as metal roofs or metal chimneys should normally use their own metal objects as lightning receptors (other flammable and explosive sites are specified). Installation of lightning protection short needle: Under the premise that the lightning protection strip is installed on the building's sky surface, a short lightning rod must be installed on the lightning protection strip at the corner of the building's sun corner to enhance the lightning protection effect of the lightning vulnerable parts.

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