Sky City, a skyscraper in Changsha, China, was meant to be the tallest building in the world by now. Construction began on 20 July last year; it was originally meant to be finished by April.
In a startling display of optimism, its builders, Broad Group, claimed it could construct all 838m of the skyscraper’s frame in just 90 days, using a technique whereby steel parts are made individually and then stacked together. This is not quite as crazy as it sounds: the firm has successfully used the same technique to construct at 30-storey hotel in just 15 days.
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