Recently, Weihai once again opened the "Snow Nest" mode, which once rushed to the national hot search. While the snowflakes are wrapped in snow in Bincheng Weihai, there are also many potential safety hazards that cannot be ignored.
Loading...
The seemingly light snowflakes can cause such serious harm, so we must understand it comprehensively from multiple dimensions. Experts remind: Weihai City has been experiencing heavy snowfall recently, although the city's main roads are more timely to clear snow, urban traffic is normal, but some potential risks can not be taken lightly.
In most people's impressions, snowflakes are light and soft, according to scientific estimates, the snowflakes themselves are very light, as light as 5000~10000 flowers only weigh one gram. However, when it rains continuously, the weight of the snowflakes is enough to crush trees and even buildings.
Xu Rongsheng, chief engineer of Weihai Planning and Design Institute, introduced that after the snow on the roof reaches a certain thickness, the bulk density of snow is different from what everyone imagines, and our country has two specifications on the bulk density of snow, the first is the "Building Structure Load Code" promulgated in 2012, which is 130 kilograms per cubic meter, and the second is the "Technical Regulations for Steel Frame Light Houses in the Market" promulgated in 2015 , the above is 160 kilograms per cubic meter, and we take the latter of the two specifications and calculate it according to 160 kilograms per cubic meter.
Therefore, after the snow, we must remove the snow on the houses, factories and sheds in time to reduce the load and prevent deformation and collapse under the weight of the snow.
Xu Rongsheng said that when the snow on the roof reaches 60 kilograms, it is equivalent to 38 centimeters of snow, that is, when the snow on the roof reaches 38 centimeters, you should start to clear the snow. For the planting of greenhouses, the country's "Fruit and Vegetable Greenhouse Planting Specifications" stipulates that the snow load that occurs once in ten years is 30 kilograms per square meter, which is equivalent to a snow load with a thickness of 19 centimeters.
In addition, the external drainage system of some old-fashioned residential buildings is prone to the formation of ice picks and icicles under the eaves, and when the temperature rises and the ice and snow gradually melt, these ice picks and icicles are likely to fall from a high altitude "carelessly" and form a high-altitude falling ice.
The staff reminded the public to pay attention to the slipping of snow on large roofs and the fall of ice cubes formed after the snow melt when going out, and pay attention to their own safety.
Source: Live Weihai