Construction work on the Länsimetro underground tunnel shaft is about to start in Tapiola, at the corner of Kelohongantie and Puhurinpolku. The work will commence in week 28 with the felling of trees on the construction site and fencing in of the site.
The actual construction of the shaft will commence in week 30. The work stages to be carried out above the ground include excavation in earth, earthmoving and the drilling of the excavation holes. Blasting work will be carried out in the tunnel, and the broken rock will be hauled away through the Etelätuulentie work site base. Earthwork and excavation work will continue until spring 2013. Shaft structures and the shaft building above the ground will be constructed in 2013-2014.
In the underground tunnel there is a shaft, reaching up to the surface every 600 metres, for emergency exit, smoke extraction, pressure equalisation and ventilation. There is an emergency exit stairway with fire compartments halfway through the shaft. The number of vertical shafts on the route totals 15. The exits of the vertical shafts are in streets or public parks. The shape, structure and facade materials of the shaft buildings will be designed to be appropriate for their surroundings.
More information available at
Earthwork and excavation: Skanska Infra Oy/Tuomas Laamanen,
tel. 020 719 2852