In the history of high-rise construction the idea of putting the lifting equipment on top of the structure under construction has a long tradition. For example the typical skyscraper construction of the early 20th century relied on derricks based on the inner steel structure of the buildings. Since the middle of the last century more and more internal climbing tower cranes took over their job with considerable savings in construction time. However, when topping out the tall building, a roof-mounted lifting device may be the only choice for bringing down the climbing tower crane.
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