Demolition, just as construction and renovation, is regarded as a risky activity that results in large scale pollution and waste disposal. This is why Canada, like most countries around the globe, tightly regulates this activity. Before embarking on a demolition exercise, you must follow strict rules and regulations enforced by local councils.
There are many demolition techniques available at contractors' disposal. The techniques opted for by contractors are, however, governed by several considerations. The following is a brief examination into three demolition techniques and their applicability in different demolition exercises.
Demolition by explosion or implosion
This is a method widely preferred due to its ability to greatly shorten the demolition period. An explosives expert, in conjunction with a structural engineer, determines the key support structures of a building. Holes are then drilled in the structures and filled with explosives. On detonation, the main structures brought down are supposed to result in the collapse of the entire building. In many cases, the buildings are usually first stripped to their structural backbones before using explosives. This technique is tightly regulated in many countries and requires more permission.
It is good to use shock firing instead of other firing methods. This ensures that no one is around or within the building when explosives are fired. In case of a misfire, it is advisable to have a clear re-trial procedure. Remember that the building is partially demolished. This is a technique used on almost all types of storey buildings.
Demolition by balling
This technique involves a crane swinging a large ball onto the building that requires demolition. The crane must always be operated by a specialised technician. Balling is useful where a multi-storey building has been partially demolished and requires final destruction. In this case, no worker or expert should be inside or near the building. Balling employs specialised techniques and angles for safety. For instance, when demolishing, the angle of the booming ball should not hit the surface at an angle more than sixty degrees. It is paramount to note that specific cranes must be used for the process. A modified hydraulic crane can never handle the demolition process effectively and puts everyone in danger.
Slow as it may be, this technique is widely employed due to safety. Workers with large sledge hammers demolish the building from roof proceeding downwards. Debris should not be left to accumulate on the floors as this may cause a collapse. A contractor should build guard rails and other safety nets for the demolishing workers. On close of the day, it is good to support the partially demolished areas. This is to prevent accidental collapse due to natural forces, such as the wind.
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