Sauerbruch Hutton Architekten, Berlin/Germany
2012 − 2013
2013 − 2014
Services by Werner Sobek
Structural planning (WP 1 − 6 acc. to § 49 HOAI)
Hager Electro SAS, Obernai/France
Jan Bitter, Berlin/Germany
The Hager Forum in Obernai is the central French visitor centre for Hager, a electrical technology company. The building provides training rooms, exhibition spaces and office areas for the firm’s Design and Innovation Department. The two above-ground storeys have a floor plan of 39 x 72 m (the basement stretches the entire 39 m width of the building, but only measures 58 m in length). A 15 m-wide atrium located along the central axis divides the building into two wings. The upper storeys of each wing are connected by a concrete bridge in the centre of the building. A prestressed monostrand allows this bridge to span the atrium over a distance of 21 m without using any supports. Aside from the atrium’s large-span bridge construction, the new building’s most striking feature is undoubtedly its roof structure. The construction made from laminated wood juts far out over the entrance area. The 39 x 108 m roof sits on a total of just 14 supports. Horizontal loads are transferred through the roof panel into the steel-reinforced concrete bracing walls via linear coupling elements. The roof is divided into a grid of 3×3 metre squares, a regular layout that enabled a high level of pre-fabrication and permitted the use of a particularly economical method of construction. Ceiling elements integrated into the roof coffers optimise the building’s acoustic and climatic properties.Transparent areas allow daylight into the building in a targeted manner.