With the reinforced concrete structure is widely used in the building, around the middle of the 20th century, building on the traditional lightning rod is generally replaced by "cage lightning network." "Cage lightning network," use the building itself as a steel mesh deflectors and grounding, the bars within the building as a single entity by welding, pulsed electromagnetic field around the building will be greatly reduced, inside the building, including its weak equipment protection.
"Cage lightning network" has more advantages than the traditional Franklin lightning rod, is the most widely used modern building a lightning protection technology. View the latest Olympic games basically adopted the "cage lightning network." In the nest, for example, mine design clever use of the Bird's Nest huge metal roof to act as air terminals. Thus, the nest is a huge air terminals "lightning face" and all of it "reinforced steel frame" constitutes a cage lightning network. This huge cage protecting the nest, when the lightning comes, will follow the current one by one, a piece of steel rebar and even a "highway" and quickly import ground.
In addition to direct lightning strikes in recent years, sophisticated equipment of lightning accidents increasing, because of its internal electronic equipment withstand voltage is very low, very afraid of lightning (ie thundercloud of the building all kinds of metal pipe, wire lightning pulses generated by a threat to the security personnel inside the building and a variety of electrical equipment). Therefore, the lightning became the focus of modern mine. Measures taken by the various devices within a building to have a good grounding and wiring systems, as well as a safe distance, and install the appropriate arrester according to the situation or take measures to shield the various lines. For example, in some public buildings, heating equipment, in addition to the discharge line are attached to a copper language lab or computer room floors have adopted special flooring materials. These are provided in order to mine.
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