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World's tallest building


Not content with building islands in the shape of palm trees and snow fields in the desert, engineers in Dubai are building the world's tallest building. The Burj Hotel reaches the 70storey (245m) mark this week, and will continue climbing at the rate of two storeys every seven days to a height of at least 729m on completion at the end of 2008. Developer is EMAAR Properties and the concrete formwork specialist is Doka.

The most challenging formwork application relates to the central shaft core and the wing walls, which have to be cast using self-climbing formwork systems. The formwork concept developed by Doka in collaboration with the contractor Samsung, Besix and Arabtec JV allows climbing steps to be taken independently of one another in six separate zones, with work on the wing walls preceding several storeys behind the central shaft core.

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