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B. Kromoser, J. Kollegger:
"Building shells from initially flat hardened concrete plates";
Vortrag: IASS 2015, Amsterdam; 17.08.2015 - 20.08.2015; in: "IASS 2015 Proceedings of the Annual International Symposium on Future Visions", (2015), S. 1 - 10.

A new construction method called "Pneumatic Forming of Hardened Concrete" was invented at the Institute for Structural Engineering at Vienna University of Technology. The idea behind this new construction method is to build free formed concrete shells originating from an initially plane plate. During the transformation process, the elements are bent until the required curvature is reached. In preliminary experiments could be shown that the steel ropes (5mm diameter), used as reinforcement, are able to absorb the occurring strains during the distortion. Pneumatic wedges, mounted between the concrete elements, protect the thin foil used as lifting formwork and avoid that the large lifting formwork breakes during the transformation process. Additional post-tensioning cables support the shaping process and are locked at the anchor bodies to fix the form of the concrete shell. Finally the joints between the elements are filled with grout.
Two prototypes of a spherical shell (10,8m diameter and 50mm thickness) and a free formed shell (17,6x10,8x2,9m and 50mm thickness) were built in Austria in autumn 2012 and spring 2014 will be presented. Possible application areas for temporary buildings and an application for a viaduct for wildlife built with the construction method will be described in the end of the paper.

concrete shell, pneumatic formwork, bending of hardened concrete plates, free-form shell, pneumatic wedges