Nemetschek Engineering User Contest 2009 • Category 6: CAD Engineering, Buildings 223 6 Helsinki Music Hall On the other side of the building is situated the street with the most amount of traffic, including trams and buses, of Helsinki. On the opposite side there is the main railway station. The structural sound isolation was done with the help of structural absorbers, springs and room-in-room techniques. The shape and form of the main concert hall is quite complex and the acoustic demands are very strict. The concrete structures have been designed with the help of Allplan Engineering. The contractor wanted to have very accurate reinforcement drawings with steel lists of all the reinforcement. The property of Allplan Engineering for reinforcing multiformed structures was used in order to do the work fast, accurately and effectively. The Music hall is located near the Töölö Bay which is part of the Finnish gulf. As a result there is a water pressure of 10 meters loading the underground structures which are made of large bore piles. The roof structure was an interesting engineering task because the span is 40 meters and the roof itself is quite heavy for acoustical reasons. Additional loading to the roof comes from the facade which is made of glass panels which are hanging from the roof. The roof structure was done using post tensioned concrete beams. The fitting of the HVAC-techniques to the building proved to be quite a challenging task in this Design and Built project. There were a large amount of openings in the walls and slabs. The fitting and the cross checking was done BIM model based using the IFC standard in the data transfer.
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