Demolition could be described as the opposite of construction, and is the ripping-down of buildings or other structures, typically by a demolition contractor. Demolition should not be misinterpreted as deconstruction, as the later is taking apart of a building in a phase by phase manner, keeping intact the valuables for re-use. Demolition of a certain building or a structure is carried out for various reasons; when a new building has to be constructed replacing a classic and unstable structure, each time a building or a structure becomes an obstacle for development projects and becomes mandated by the authority for that to be demolished, or even when a person decides to demolish their building for building a better one. Even though the term ‘demolition’ has negative implications, generally it leads to developmental activities later on.
For small buildings like houses, demolition is a simple process where a demolition contractor brings in equipment like a bulldozer or a crane may be used to manually pull down the structure. Demolition of a top rise building or a structure is a far more complex process, requiring a commercial demolition expert, which takes many forms and involves a series of steps or stages. Implosion is also a kind of demolition, but is not the sole, and it involves some controlled explosions which decrease the building to its foundation. Therefore demolition shall be broadly classified into non-explosive and implosive (or explosive so to say).
A non-explosive demolition practice may involve use of hydraulic excavators, hoe rams, cranes with wrecking ball and loaders or bulldozers. Hydraulic excavators are often used to reduce buildings up to two stories in height, in a careful and controlled manner, determining the manner and direction of the building’s fall. A demolition contractor will an average of use a hoe ram in bridge demolitions, since it proves to be very effective in breaking down the concrete road deck and piers. When a structure must be paid down to a desired height, than demolished completely, cranes with wrecking balls are used. However , bearing in mind the safety hazards it may cause, sufficient precautionary measures can be ensured.
Building implosion or demolition using explosives is recognized as to be the last alternative, since it can prove to be a dangerous method; even a slight error can lead to devastating damage of the surrounding buildings and the flying debris can damage the near by observers even to the extend of killing them. Usually it’s done by a series of in the pipeline explosions within a building, thereby weakening the support structures leading to a collapse.