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The largest steel columns ever constructed have been installed in a new high rise building in downtown Tokyo.

Four giant 55m tubular columns - each weighing more than 300t - are being used to form the corners of the Pacific Century Place Marunouchi development. The 3.4m diameter tubes will be filled with 460m 3of concrete to provide earthquake resistance. Jointly designed by Nikken Design and contractor Takenaka Corporation, the building will contain 82,000 m 2of hotel and office space on 36 levels. NKK Corporation of Japan supplied the steel columns which were made from 100mm thick high tensile steel plate using a new hot rolling process.

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