Demolition using explosives is done by weakening the critical structures of a building, which in turn is done by triggering the explosion in a controlled manner. Explosive materials are placed in strategically determined locations within the building and the sequence of explosion is carefully planned. On successfully executing the series of explosions based on the pre-planned sequence, the building collapses to itself and gets reduced to a pile of easily removable debris.
Demolition of Aladdin Hotel, Las Vegas
Implosion could not be used as a synonym for demolition using explosives, since the true meaning of which is the phenomenon which causes a structure to implode due to the high difference in internal and external pressure. In total contrast to the true meaning of implosion, demolition using explosive materials works on the principle that the building collapses to itself as it can no longer withstand the force of gravity, because the critical structures that helps it to do so has been destroyed or weakened by using explosives. However, the term implosion is being generally used whenever a building is demolished using sequential explosions, even though the true meaning differs.
Demolition using explosives, usually involves the usage of explosive materials like Nitroglycerine, Dynamite or other explosives to weaken the reinforced concrete support structures, and shaped charges are used to weaken steel support structures. A strategically sequenced detonation of these explosives weakens all the support structures, followed by the explosions in the lower floors leads to a controlled collapse of the building.
The basic objective in any case where explosives are used to bring down the building, is nothing but to carry out the process without causing any damage to nearby structures. So the planning involved is usually rigorous and careful, any slight error in the sequence of explosion might even deviate the collapsing building to fall over the nearby buildings.
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