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Salvo Llp • July 2010
Wednesday, December 02, 2009
Daruma-otoshi skyscraper demolition
Tokyo, Japan
Japanese construction firm Kajima Corporation is using an innovative new skyscraper demolition method to dismantle a pair of old company buildings in Tokyo.
Unlike conventional demolition that begins at the top of the building, Kajima’s new method starts on the bottom floor, where the support columns are cut and replaced with giant computer-controlled jacks. Once the floor is demolished and the debris removed, the entire building is lowered and work begins on the next floor. The process is repeated for each floor until the entire building is gone.
According to Kajima, the daruma-otoshi demolition method — which is now being used to dismantle a 75 meter (246 ft) tall, 20-story building and a 65 meter (213 ft) tall, 17-story building — is safer and creates less noise and dust pollution because the work is kept close to the ground. In addition, this method cuts demolition time by 20% and makes it easier to separate materials for reuse and recycling.
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