Retractable Roof - Fortress Kufstein

Kufstein, Austria, 2006
Client: Stadtwerke Kufstein GmbH
Operator: Top City Kufstein
Project management: Jastrinsky Baumanagement, Salzburg
Concept: Alfred Rein Ingenieure
Architect: Kugel Architekten
Structural engineering: Alfred Rein Ingenieure with Dr.-Ing. Greiner, Walter Fichtner Ingenieure

In order to protect open-air-events on the Josefsburg during adverse weather, Alfred Rein Ingenieure developed a delicate, radial cable structure. A membrane located in its center, similar to a huge umbrella, can be unfolded to cover a 2.000 square meter area. The umbrella can be opened or closed within 4 minutes. While the roof is open, the membrane stays compactly folded under the central hub.