Weather and blasting

People living in this city occasionally see a building start to explode one day. When the building suddenly falls to the ground, the dust around the building is dense, which seriously affects the lives of the surrounding residents, and the vehicles parked on the roadside are also covered with dust. When a building falls, the dust generally rises 1- 10 minutes. But we usually see that this kind of blasting is carried out on sunny or cloudy days. Generally, sprinklers are arranged at the blasting site to sprinkle water on the spot to reduce dust and clean the road surface, so as to minimize dust and reduce the impact on the surrounding residents. Many people want to ask, under the background of strict control of urban dust pollution in major cities, why choose sunny and cloudy days for blasting? Why not choose rainy day blasting? Isn't dust suppression more effective than sprinkler in rainy days?

In fact, there will be a lot of dust when blasting in rainy days. On rainy days, the surface is just wet, and the building materials are not wet, which can spread far away. Rainy days have a little effect on blasting dust, but the effect is not obvious, and foam is more effective. However, it is inconvenient to carry out blasting operation in rainy days, which will affect the blasting operation and the situation cleaning after blasting. Therefore, there is little difference between the dust in rainy days and sunny days. On the contrary, rainy days affect blasting operations, and everyone will choose sunny blasting.

Let town planners talk about the problem of blasting and dust prevention according to concrete blasting examples in reality, and demolish buildings by blasting in densely populated cities. The most typical example is the successful blasting of Guangzhou Gymnasium on May 1 day in Guangdong Province. At that time, the dust-proof method of blasting operation in Guangzhou was to soak the gymnasium with water in advance, and set up a spraying system around the gymnasium. Helicopters sprayed a lot of water in the air. Among them, the sprinkler system adopts a water pipe with a thickness of 8.25cm and a pressure of 12 kg, and forms a water belt with a width of 30 meters around the gymnasium to prevent the dust generated by the explosion from spreading around. As for the construction waste produced after blasting, the steel bars in concrete can be knocked out manually and recycled, which I think Guangzhou Gymnasium did after blasting.