The new building with its five floors is designed as a suspended construction and can thus cantilever over an already existing district heating conduit that runs underneath the ground floor. The ceiling’s edges are held by 16 ties, each only 36 mm in diameter. These ties are suspended from a reinforced concrete grid arranged over the roof of the building. This pre-stressed support grid rests on four reinforced concrete columns, which carry the entire vertical load and simultaneously serve as utility shafts. The hangers remain visible in the lecture rooms and thus illustrate the constructive principle of the building. Protrudent escape balconies form a second facade layer and are also suspended from the support grid as a light steel construction.
Four specialist departments - one building The four specialist departments are located on the upper floors of the building. They are arranged around a free space in the center – the atrium. Each floor is U-shaped, and the open side of each floor is rotated 90 degrees further to the right than that of the floor underneath. An administration area and an exhibition area as well as a small café corner are located on the freely formed ground floor. Stairs in the central atrium serve as a vertical connection of the four floors – and thus symbolize the connection of the four disciplines. The atrium also offers a space for interdisciplinary communication. Nine air-filled film cushions form the atrium’s roof. These highly transparent film cushions obtain their load-bearing capacity from the internal air pressure. They are transparent enough to offer an almost undisturbed view of the sky. This construction is considerably cheaper than a traditional glass construction, and is thus an ideal and money saving solution for constructing a transparent roof of that size.
The vivid details The experimental and simultaneously vivid character of the XLAB institution is also expressed through unconventional but concise detail solutions that can be found in the structure of the building. The outside fire escape balcony is implemented as a suspended construction and thus repeats the structural idea of the building on its facade. Walkways, handrails and bars are literally thread on round steel, each 16 mm in diameter, which are hung from a collective load-bearing "curtain rail" suspended from the large support grid placed at the roof parapet height. The single-flight stairwell spans seven meters and is located in the central atrium. The stair-rails are constructed with expanded metal panels, which simultaneously serve as supporting elements. The static calculation of this construction is only possible approximately and was implemented by means of loading experiments on a prototype.
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