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A combination of standard and customised Doka formwork is helping one of the UK’s leading building contractors to produce fair face Y-columns and irregular floor plans on the first phase of a mixed-use development in the centre of Manchester, England.
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The cores are being built using Doka‘s guided climbing system (GCS) and Framax panels. Luca Amitrano (left) and Tony Arpino (right)
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Spectrum, a development by Dandara Ltd, includes four residential blocks, which will contain a total of 350 one- and two-bedroom apartments, ranging from 312 to 713m2. Six-storey Block 1 has a triangular shaped floor plan, while a key feature at the main entrance of 13-storey Blocks 3 and 5 are four, Yshaped, fair face concrete columns, each measuring 8m high.
Main contractor John Doyle Construction is using Dokaflex tables with modified tables for the corners of the building for added safety and standard Dokaflex for the infill areas. Doka’s table hoist system further speeds up the operation and reduces crane requirements. For the Y-columns, Doka designed special formwork shutters. These were preassembled and delivered to the site ready to use. The columns, which have a central stem measuring 800mm square and an overall width of 5.5m, are poured in two sections using self-compacting concrete. On Blocks 3 and 5, the main contractor has a combination of standard rectangular Dokaflex tables and Aluxo support towers up to 8m high to support the 1300mm thick transfer slab.
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For the Y-columns, Doka designed special formwork shutters, which were preassembled and delivered to the site ready-to-use.
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The cores are built simultaneously using the Guided Climbing System (GCS), Framax panels and Framax stripping corners. Average cycle times are six days for the cores and two weeks for the slabs. “These systems allowed us to continue working when the weather conditions made it impossible to use the crane,” says project manager Luca Amitrano. “The service from Doka was very good. Technical support was excellent and they responded rapidly to design changes on the core walls and the Y-columns.” The 12-month project is scheduled for completion in July 2006.
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