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B. Kromoser, J. Kollegger:
"Building free formed concrete surfaces by using the "Pneumatic Wedge Method"";
Talk: The 10th fib International PhD Symposium in Civil Engineering, Université Laval, Quebec, Kanada; 2014-07-21 - 2014-07-23; in: "The 10th fib International PhD Symposium in Civil Engineering", J. Bastien, N. Rouleau, M. Fiset, M. Thomassin (ed.); (2014), ISBN: 978-2-9806762-1-5; 303 - 308.

A new construction method called "Pneumatic Wedge Method" was invented at the Institute for Struc-tural Engineering at Vienna University of Technology. The idea behind this new construction method is to build concrete shells with double curvature originating from an initially plane plate. During the trans-formation process, the elements are bent until the required curvature is reached. The steel ropes, used as reinforcement, are able to absorb the occurring strains. Pneumatic wedges between the concrete ele-ments protect the thin foil used as lifting formwork and regulate the distance of these concrete elements during the transformation process.
A prototype of a double curved shell (13m diameter, 50mm thickness) built in Amstetten, Austria in autumn 2012 is presented in this paper.

double curved shell, concrete shell, pneumatic formwork