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Open Spiral Concrete Stair Drawing . A cluster of huts encircle the centrally erected restaurant and a banquet hall, with streets on both sides leading towards the haveli. Besides being a major design feature, a modern spiral staircase is a real space saver. AutoCAD 2012 spiral staircase detail drawings, plan from www.pinterest.co.uk A short summary of this paper. Reinforced concrete design to eurocode 2. Besides being a major design feature, a modern spiral staircase is a real space saver.