evelopers and demolition experts look at several factors when deciding how to demolish a building.D Among other concerns, they consider the area where the building is located, the primary building materials, the purpose of the demolition, and how to dispose of the debris. Demolition methods can range from one devastating blast to careful, piece-by-piece dismantling, but in a crowded urban setting, any technique must be safe for the demolition crew and the surrounding buildings and public areas.
Implosion is by far the most dramatic way to demolish a building. It involves using explosives to knock out a building’s primary vertical supports, causing the building to collapse onto itself from the inside out. The placement of the explosive charges and the sequence of detonation are critical to a successful and safe demolition. Implosion is often used to demolish large structures in urban area.
Wrecking ball demolition, or crane and ball demolition, is one of the oldest and most common methods of building demolition and is typically used for concrete and other masonry structures. The wrecking ball—weighing up to 13,500 pounds—is suspended on a cable from a crane or other heavy equipment. The ball is either dropped onto or swung into the structure, simply crushing the building with repeated blows.