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PLAIN SAILING

Round the clock concreting for Portsmouth's £21M Spinnaker Tower has begun again, after a three day pause this weekend, taking the slim core on to its full 140m height. A halt in slipforming by specialist subcontractor Bierrum was needed to change the form profile into a single core shape after the first phase had completed two 75m high hexagonal 'legs' tapering together at 2.5infinity. The purposebuilt double deck form began work on 10 March using 6t jacks to climb on 28 steel ...

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