Beijing 45 meters above the high-rise beware sideswipe Ray
ring set with a schematic architectural lightning
cover the higher the more modern buildings, Thunder has “learned” to bypass the lightning hit the building side of the waist, or slipped into the house electrical attack. Traditional methods are no longer catch lightning trip up?
morning, City Center, said lightning protection device safety testing, in October this year onwards, the implementation of the new mine building design standards. Which focus on high-rise buildings lightning specification changes, new construction, renovation, expansion of 45 m above the tower must be designed to sideswipe mine protection, and will include new areas of project approval.
question
a lightning rod
unable to resist the “Thunder”?
modern building, why in the Thunder in front of more “fragile”?
lightning protection device safety testing center city engineer Song Ping Jian, each building have to be equipped with lightning protection devices, including lightning, lightning protection zone, grounding devices. Within the building cable, phone line, satellite receiver, power supply have to install surge arresters, lightning induced damage.
lightning detection, according to the annual show, urban construction, the cloud-prevention device installed higher rate of more than 90%, but the disasters caused by lightning tower “internal injuries” are more and more.
Song Ping Jian, for high-rise buildings, some taller than 45 meters, the top of lightning rod alone, almost no effect. Some sideswipe Ray will be around in some cases, lightning hit the building the waist.
and, more and more modern structure’s facade with metal window frames, glass curtain wall keel, are lightning point.
but the existing lightning protection standards for buildings started in 2000, the lightning protection zone too far center, can not fully protect the edges of the building.
air conditioning
outdoor
lightning with
elevator
room
lightning rod
vent
satellite dish
deflectors
grounding
graphics/Liu Jiang
deflectors
≥ 5m
grounding
(around the ground, with marble, asphalt and other insulation material lay)
lightning protection zone along the corner, the roof, eaves and Yan Jiao and other vulnerable parts of the laying of lightning, the whole surface of the composition is not greater than 10m × 10m grid.
when the tree near the building and not within the scope of protection in the air terminal, the spacing between trees and buildings of not less than 5m.
solution
October Lightning high-rise buildings “upgrade”
Song Ping Jian, said the new building lightning protection design specification has been developed and will be implemented from October this year. The specification applies to new construction, renovation, expansion of construction projects, lightning protection measures for buildings, equipment placement, anti-lightning in making the required standards. This specification standards will be incorporated into new areas of project approval.
which the new lightning protection standards biggest feature is that for high-rise building lightning protection to “upgrade.”
45 meters tall beware sideswipe Ray
new rules update the design of high-rise buildings with lightning protection.
the top outer edge of lightning protection zone to be extended to the building, covering every angle of the roof; and require all facade metal, keel grounding device to be installed to protect the building body.
when building height exceeds 45m, then laid along the roof flashing around the band, then flash should be set with the outer wall or roof surface or the outer edge of the vertical line. Between the air terminal should be connected to each other.
Beijing in the history of lightning disaster
Gold (1195): August, lightning shock, Long Ao armillary sphere from under the cloud water tablets (Observatory armillary sphere and the back seat), suddenly the crack and destroy Taiwan, armillary sphere servant off the audience.
Ming (1531): June Dimba day, the Meridian Gate of the turret and the Xidan lightning gate tower column.
Qing (1889): August 24, during a thunderstorm, the Temple of Heaven Qiniandian thunderbolt spread.
1961 年 7 Feb. 6: Summer Palace Wenchang Pavilion lightning, beast, and shot off three horizontal ridges.
1998 年 6 29: Caishikou, Deshengmenwai residential lightning, more than 100 TV and telephone are Jihuai.
2009 年 6 16: Xicheng District, Building 2 Zhenwumiao six years caused by lightning strikes 2 lifts stop work for nearly 60 hours.
Note: The 10-story high-rise building means more housing and other civil construction, public buildings above 24 meters. Edition text/correspondent Tao Ying
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