Ring Rail twin tunnel & underground stations, Finland

Ring Rail twin tunnel & underground stations, Finland

helsinki, Finland

Project facts

Client: Finnish Transport Agency

Project type: Twin tunnel, drill and blast, total length 8 km; 4 underground stations

Project Period: 2008 - 2014

Services: General planning and environmental impact assessment; Bridge design; Rail engineering; Rock and geotechnical engineering; Tunnel design; HVAC engineering; Electrical engineering; Structural engineering; Telecommunications design; Safety planning

The Ring Rail Line will constitute an efficient mass transit system to serve the entire Helsinki region and offer a quicker route to the Helsinki-Vantaa airport.

The Ring Rail Line will be a very important circular rail route of the Helsinki Metropolitan Area. Pöyry is responsible for the detailed design of the access tunnels and running tunnels, and rock excavation design of the underground stations. The project is carried out in consortium with other organisations.

The length of the new rail line is to be about 18 kilometres, of which about 8 kilometres runs in tunnel. Excavation of the four underground stations using the drill and blast method started in spring 2009.

The twin tunnel crosses very close to the Päijänne tunnel and runs through Ruskeasanta groundwater area. These areas need to be designed with particular care because of their special characteristics such as seepage of the groundwater. Also passing underneath the airport sets its own special requirements.