With the development of society, both personal safety and building safety are issues of social concern, so lightning protection knowledge is essential. Do you know what lightning protection level is? What are the lightning protection levels and design requirements of different buildings?
First, the lightning protection level
A class of lightning protection buildings:
1. Any building that manufactures, uses or stores a large number of explosive substances, such as explosives, gunpowder, primary explosives and artifacts, will explode due to electric sparks, causing great damage and personal injury.
2. Buildings with explosive hazardous environment in Zone 0 or Zone 10.
3. The buildings with explosive dangerous environment in 1 area will cause huge slope damage and personal injury if they explode by electric spark.
The second type of lightning protection buildings:
First, national key cultural relics protection buildings.
Two, the national pavilion, office buildings, large-scale exhibition buildings, large railway stations, state guesthouses, national archives, important water supply pump houses in big cities and other particularly important buildings.
Three, the national computing center, international communication hub and other buildings of great significance to the national economy and buildings equipped with a large number of electronic equipment.
4. For buildings that manufacture, use or store explosive substances, the electric spark is not easy to cause explosion or cause serious damage and personal injury.
5. For buildings with explosive dangerous environment in1area, electric sparks are not easy to cause explosion or cause great damage and personal injury.
6. Buildings with explosive hazardous environment in Zone 2 or Zone 1 1.
Seven, industrial enterprises have the risk of explosion of open-air steel closed gas tanks.
Eight, the number of lightning strikes is expected to be greater than 0.06 times /a, provincial office buildings and other important or crowded public buildings.
Nine, lightning strikes are expected to be more than 0.3 times/seat of residential buildings, office buildings and other general civil buildings.
The third type of lightning protection buildings:
First, provincial key cultural relics protection buildings and provincial archives.
Two, the estimated number of lightning strikes is greater than or equal to 0.0 12 times /a, and less than or equal to 0.06 times /a, and its important or crowded public buildings.
3. General civil buildings such as houses and office buildings with an estimated lightning strike frequency of 0.06 and 0.3 times/year. ..
Four, the expected number of lightning strikes is greater than or equal to 0.06 times /a of general industrial buildings.
5. According to the impact of lightning on industrial production and its consequences, combined with local meteorological, topographic, geological and surrounding environmental factors, determine the fire hazard environment in 2 1, 22, 23 areas that need lightning protection.
6. Isolated towering buildings such as chimneys and water towers with a height greater than 15d/a in areas where the average thunderstorm day is greater than 15m; In areas where the average thunderstorm day is less than or equal to 15d/a, isolated towering buildings such as chimneys and water towers with a height of 20m or more.
Second, the lightning protection design requirements of buildings
Lightning protection design requirements for a class of lightning protection buildings
A lightning rods shall be installed on the roof, or lightning protection belts shall be installed on corners, roofs, parapets and eaves, and a metal grid with a size not greater than 10m× 10m shall be installed on the roof.
B. Priority should be given to using the main reinforcement as the down lead, and the column reinforcement at each outer corner of the building profile should be used. There should be no less than 2 down leads. The down conductor spacing shall not be greater than 18m.
C. The electrical lines and metal pipes entering the building should be buried in the whole line, and the metal sheath, steel pipe and metal pipe of the cable should be connected with the grounding device at the entrance.
D the impulse grounding resistance of grounding device shall not be greater than10Ω.
E. every three floors are connected with various vertical metal pipes and down leads by using concrete ring beams or flat steel bars scattered on the external wall of the building as equalizing rings.
F when the height of the building exceeds 30m, the larger metal objects such as railings, metal doors and windows on the external wall should be connected with lightning protection devices at 30m and above.
2. Lightning protection design requirements for secondary lightning protection buildings
A.b.c.d at the same level, except that the roof metal grid is not greater than 15m× 15m.
3. The lightning protection design requirements of the three-level lightning protection building
It is the same as the first-class a.b.c.d, except that the metal grid on the roof is not more than 20m×20m.
I believe that after the above introduction, everyone has a certain understanding of the difference between primary, secondary and tertiary lightning protection. Welcome to Zhong Da for more information.
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