How Are Cranes Removed From Sky Scrapers?
Crane Systems A crane is a pulley system used to move very heavy loads both vertically and horizontally. They are a vital part of skyscraper construction, because they are the only devices capable of moving up the heavy materials needed to construct the upper stories. There are many different types of cranes, and different types may be involved in construction a skyscraper, from rotating jib cranes to pillar and gantry cranes. Sometimes the crane is placed on the top of the skyscraper and buildings underneath itself, but most often the crane is placed on top of a towering scaffold next to the building. Raising Cranes In either case, the question remains: how is the crane placed so that it can continually rise with the skyscraper, and how is the crane taken back down when the building is finished? The answers to both are deceivingly simple. Building the crane up is a relatively easy task accomplished mostly by the crane itself. The scaffolding or “mast” that the crane is supported on is
