For the lightning protection measures of category I buildings and buildings with explosive dangerous environment, in addition to direct lightning protection, lightning protection measures should also be taken; The lightning protection measures for the second or third type of common curtain wall building are mainly against direct lightning. Main direct lightning prevention of building curtain wall, should not only consider the top direct lightning, consider lateral direct lightning, a layer of lightning proof is installed at the top of a building lightning protection or lightning rod or ShanQi consisting of the mixture, the lightning protection network usually along the corner by the regulation, such as roof, roof laying vulnerable to lightning strike, In addition, the whole roof is composed of a grid no larger than 10mx10m or 12m×8m. The lightning protection measure is to set a circle of closed pressure equalizing rings between the layers of the curtain wall structure, and then send them to the grounding device through the lead down line.
The lightning protection device of building curtain wall mainly includes lightning receiver, lead down line and grounding device. In lightning protection design of architectural curtain wall, should make full use of these devices of buildings, the building curtain wall vertical keel, transverse keel and building lightning protection network connected together as a whole lightning protection, the construction curtain wall of huge lightning energy, through the construction curtain wall system of lightning protection, quickly to the ground, the role of protection against lightning damage to the modern curtain wall.
Used for lightning rod size, if according to the thermal stability test, as long as a very small section is enough, the size is mainly considered mechanical strength and corrosion resistance, lightning rod should be used round steel or welded steel tube, its diameter should not be less than the following values: needle length 1m below, round steel is 12mm, steel tube is 20mm; Needle length 1~2m, round steel 16mm, steel pipe 25mm; Round or flat steel is preferred for the lightning arrester and lightning arrester. The diameter of the round steel should not be less than 8mm, the cross-section of the flat steel should not be less than 48mm, and the thickness of the flat steel should not be less than 4mm. Under the same section, the circumference of the round steel is smaller than that of the flat steel, and its contact surface with the air is also small, and the air corrosion is relatively small.
In addition, round steel is easy to construct and materials are readily available, so it is recommended to use round steel first. When the lightning arrester is arranged for the curtain wall facade, the lightning arrester grid size shall not be larger than 5m×5m(or 6m×4m) for the lightning protection buildings of the first class.
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Post time: Feb-27-2023
