The new headquarters for the European Central bank (ECB), designed by the Coop Himmelb(l)au architectural practice, is under construction on the site of a former wholesale market to the east of Frankfurt’s city centre. Three main elements make up the new premises: twin office towers, an entrance building and the former wholesale market hall itself. The two twisted towers of the high-rise building will add a prominent feature to the Frankfurt skyline. The entrance structure connects the glass twin towers to the refurbished market building, which dates from the 1920s and is now protected by a conservation order.
The external envelope to the 185 m high twin towers is in the form of a “shield hybrid façade” – designed, produced and erected by seele. This energy-efficient façade is a vital component in the overall energy concept and consists of three-ply prefabricated aluminium elements with electrically operated, room-high, parallel push-out elements in every second bay. These opening lights ventilate the offices directly and naturally; sunshades and anti-glare screens are fitted into the cavity of the façade. The shaping of the twin office towers has resulted in sloping façade surfaces with a hyperbolic form and scores of different elements. seele’s skills and experience in the design and construction of highly complex but nevertheless batch-produced building envelopes are indispensable here. CAM, for example, i.e. using data from 3D planning directly for programming and controlling the machining centres for element fabrication.