An extension of the Helsinki Metro system, ‘Western Metro’ has been the largest infrastructure project in Finland since 2015 with 13 stations – each unique in character. One of three stations designed by HKP Architects, Tapiola Sports Park is dramatically announced by its Ticket Hall building. But this also connects to the local area with part of its inclined roof designed as a small amphitheatre serving events in the town square.
The design sought to create a fluent and secure interior for passengers with a clear progression from Ticket Hall via long escalators linking the platforms below. Project architect Jukka Ollikainen explained: “One of our main tasks has been to eliminate the feeling of being below ground, with sunlight and spacious views through the Ticket Hall playing a crucial role.
RAISED COPPER FOLIAGE
“Here, copper leaves, behind the diagonal glass wall, add interest and create a lively interplay of light and shadow changing with different lighting conditions – a kinetic beauty reminiscent of a forest.”
In the Ticket Hall, sunlight through the copper foliage creates changing patterns on the granite floor. A similar effect occurs on the ridged white facades behind the copper foliage grid system.
The diagonal box Ticket Hall has a double façade. Its separate outer layer of copper ‘foliage’ comprises 445mm x 615mm x 4mm leaf units of pre-patinated copper in 3 shades of blue/green. Each leaf is fastened to an acid-resistant stainless steel cable system, with 4 connectors at the cable intersections.
The cables form a parallelogram-like, level grid connected to a stainless steel frame with secondary support beams attached to the background wall. Cable ends have compressed turnbuckle mechanisms for tensioning the grid.