Abstract
The paper summarises the main issues found in the design, construction and launching of two large and highly skewed post-tensioned concrete slabs built along the A4 motorway connecting Milan and Turin.The twin slabs (one for each carriageway) are characterised by a very high skew (61°) and a record span-to-thickness ratio. Each slab is 50 m long, 20 m wide and only 0,8 m thick so as to guarantee the underclearance required for the railway lines passing underneath. In order to strengthen the slabs, lateral edge beams shaped in the form of crash barriers have been added along the free sides.The two structures were cast on-site and post-tensioned beside the abutments before being push-launched over the railway lines without intermediate supports.
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