Hydraulic excavators may be used to topple one- or two-story buildings by an undermining process.The typical razing of a building is accomplished as follows: Manual ĭemolition of a hotel in southern England.īefore any demolition activities can take place, there are many steps that must be carried out beforehand, including performing asbestos abatement, removing hazardous or regulated materials, obtaining necessary permits, submitting necessary notifications, disconnecting utilities, rodent baiting and the development of site-specific safety and work plans. The tallest planned demolition of a building was the 52-storey 270 Park Avenue in New York City, which was built in 1960 and torn down in 2019–2021 to be replaced by 270 Park Avenue. The use of shears is especially common when flame cutting would be dangerous. Newer methods may use rotational hydraulic shears and silenced rock-breakers attached to excavators to cut or break through wood, steel, and concrete. Wrecking balls are especially effective against masonry, but are less easily controlled and often less efficient than other methods. Larger buildings may require the use of a wrecking ball, a heavy weight on a cable that is swung by a crane into the side of the buildings. The building is pulled down either manually or mechanically using large hydraulic equipment: elevated work platforms, cranes, excavators or bulldozers. Demolition contrasts with deconstruction, which involves taking a building apart while carefully preserving valuable elements for reuse purposes.įor small buildings, such as houses, that are only two or three stories high, demolition is a rather simple process. A house under demolition in Argos, Greece.ĭemolition (also known as razing, cartage, and wrecking) is the science and engineering in safely and efficiently tearing down of buildings and other artificial structures.
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