China's 90-day world's tallest on scheduleby John Bambridge on Oct 22, 2012
The Chinese construction company behind plans to build the world's tallest building in just three months - at a fraction of the cost of comparable skyscrapers - has rejected reports that it has altered its construction schedule.
Broad Sustainable Building (BSB) still very much expects its Sky City, a planned 220-storey skyscraper announced in June, to top out at a height of 838m in a mere 90 days and at a cost of only $628m.
In October reports suggested that the construction schedule has been revised to seven months, or 210 days - far longer than the period the company originally projected, but still astonishingly quick compared with conventional high-rise construction.
To put this in perspective, the 828m Burj Khalifa took a total of five years to build, and cost around $1.5bn.
However, Juliet Jiang, senior vice president of Broad Group, has announced: “We have not issued any press statement on this and it will go on as planned ... we have not said anything about 210 days,” adding that the company is still awaiting final approval for the project from the Chinese government.
Wired reporter Lauren Hilgers, who interviewed group founder and chairman Zhang Yue in September said:
“It’s hard to say for sure that the 1.5M square metre plan isn’t entirely a publicity stunt. But Zhang has hired some of the engineers who worked on the Burj Khalifa, and created two large models. Foundations are scheduled to be laid in November at a site in Hunan; and, if everything goes well, the building will be complete in March 2013.”
The key to the rapid low-cost proposal is BSB’s proprietary prefabrication technique, a method by which BSB eventually hopes to sell its prototype skyscrapers around the world.
BSB has already built 20 structures in China and demonstrated its proficiency for high-speed builds on several projects. In January the company constructed a 30-storey hotel in just 15 days, recording it in timelapse:
The 30-storey BSB hotel was tested by the China Academy of Building Research and found to be able to resist a 9.0 magnitude earthquake, and was subsequently recommended in an United Nations Environment Program report on the rebuilding of Sichuan after the catastrophic earthquake in the province in 2008.
The buildings is also five time more energy-efficient than a traditionally-built scheme and was delivered at a cost of $1,000 per m2 compared with $1,400 per m2 for conventional high-rise construction in China.
Sky City will be constructed using approximately 200,000 tonnes of steel, and has also been desgined to withstand earthquakes up to a magnitude of 9.0, as well as fire for up to three hours.
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