Roof
The new roof is cantilevered from an impressive triangular spatial ring truss, covered by a sand-coloured PTFE membrane resembling the shades of the sandy mine dumps. The bottom of the truss is covered with a perforated PTFE mesh membrane, creating a smooth under-slung ceiling. 12 off shutter concrete shafts, each 40 m high, support the triangle spatial ring truss. These shafts are subjected to huge tension and compressive forces, therefore they are provided with tension piles anchored in the bedrock.