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“Forming the moon” – swiftly and with maximum safety.
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| 10/14/2009 |
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In 2007, work started on the construction of the “Iris Bay”, a high-rise futuristic tower in the shape of a half moon to become a new hot spot on Dubai’s skyline.
The tower is elevated above a four-storey podium, which floats over a double height arcade. Featuring a revolutionary ovoid design, the project comprises two identical double-curved shells, which are rotated and cantilevered over the podium below. The front elevation of the half-moon-like tower will be made up of seven zones of rotated glass, whilst the back will be a continuous vertical curve. The whole building from level 4 up to the roof is supported by the core and rest on two curved main beams with a height varying from 4.5 to 11 meter, and total of 570 sqm concrete. Each of the curved beams is supported by 2 columns.
Challenge with the curved shapes
This futuristic development became a challenge for all-related professionals involved in its construction. The main difficulty was to form a 4.60 m thick and 61m long curved beam. To safely support the beam so that it could carry the superstructure, the contractor, Al Habtoor decided to use the heavy-duty load bearing towers d2, which are fast to assemble and configure, and can effectively carry a huge load of the concrete to be poured, reassuring the safety of the site crew. Up to 200 kN/m2 had to be directly transferred to the podium roof and from there, with re-propping to the raft foundation. The beam was poured in 3 segments, each app. 20 m long. The slabs between the level 4 and 11 were casted right after finishing the beam segments and had to be supported from the level 11 down without removing the formwork in between. Each slab was poured in a week-cycle.
Most of the Doka formwork materials in use are the standard products, except for some cases where a special became a necessity. A new location of tower-crane required the tie-back to be attached to the core wall for stability reasons but it had to go through already configured d2 support. Therefore, Doka offered a specially manufactured intermediate steel frame with strategically calculated webs so that the loads would be distributed equally. This solution helped to accommodate the tie-backs without compromising the safety and stability of the curved beam support.
Doka‘s expertise
Doka’s versatility in creating customised solution and very competitive engineering staff providing comprehensive planning and consulting services, successfully contribute to productive construction of this complicated structure. High quality, efficient and reliable formwork systems together with technical expertise enable fast and absolutely safe forming operations. Doka managed to provide the client with a safe working environment especially on great heights where huge vertical and horizontal loads had be supported.
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| Copyright © 2010 Continent advertising .All rights reserved. |
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