Another option is to detonate the columns at the center of the building before the other columns so that the building's sides fall inward.Īccording to Brent Blanchard, an implosion expert with the demolition consulting firm Protec Documentation Services, virtually every building in the world is unique. When the explosives are detonated in the right order, the toppling towers crash against each other, and all of the rubble collects at the center of the building. The blasters set the explosives so that each "tower" falls toward the center of the building, in roughly the same way that they would set the explosives to topple a single structure to the side. This feat requires such skill that only a handful of demolition companies in the world will attempt it.īlasters approach each project a little differently, but the basic idea is to think of the building as a collection of separate towers. In this case, the blasters proceed with a true implosion, demolishing the building so that it collapses straight down into its own footprint (the total area at the base of the building). Sometimes, though, a building is surrounded by structures that must be preserved. Blasters may also secure steel cables to support columns in the building, so that they are pulled a certain way as they crumble. To topple the building to the north, the blasters detonate explosives on the north side of the building first, in the same way you would chop into a tree from the north side if you wanted it to fall in that direction. Tipping a building over is something like felling a tree. This sort of blast is the easiest to execute, and it is generally the safest way to go. Ideally, a blasting crew will be able to tumble the building over on one side, into a parking lot or other open area. The main challenge in bringing a building down is controlling which way it falls. In some cases, the blasters may develop 3-D computer models of the structure so they can test out their plan ahead of time in a virtual world.
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Drawing from past experiences with similar buildings, they decide what explosives to use, where to position them in the building and how to time their detonations.
Once they have gathered all the raw data they need, the blasters hammer out a plan of attack. Next, the blaster crew tours the building (several times), jotting down notes about the support structure on each floor. The first step is to examine architectural blueprints of the building, if they can be located, to determine how the building is put together. In order to demolish a building safely, blasters must map out each element of the implosion ahead of time. When everything is planned and executed correctly, the total damage of the explosives and falling building material is sufficient to collapse the structure entirely, so cleanup crews are left with only a pile of rubble.
Demolition blasters load explosives on several different levels of the building so that the building structure falls down on itself at multiple points.
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