- Client: Länsimetro Oy, Tapiontori 3 A, 02100 Espoo, Finland
- Designer: Kalliosuunnittelu Oy Rockplan Ltd, Asemamiehenkatu 2, 00520 Helsinki, Finland
- Contractor: Työyhteenliittymä Metro IV (Joint venture), Metrostav a.s., division 5, Koželužská 2450/4, 180 00 Prague 8, Czech Republic, Destia Oy, Heidehofintie 2, PL 206, 01301 Vantaa, Finland
- Construction terms: 05/2011 – 09/2013
- Price: 18.717.200 EUR
Project description
The Länsimetro – Western Metro project provides a new transportation link between Helsinki and Espoo at the length of 14km completely driven underground. Rail section LU6E – Karhusaari consists of total drive- age 2 613m of track tunnels excavated in hard granite formations by usage of method Drill&Blast. Construction is including three technological chambers with ventilati- on shafts in each of them and seven interconnection tu- nnels. The route of the section is partly conducted under the sea and among other underpasses foundations of administrative complex Nokia. Challenging task was excavation in difficult undersea passages, in vibration sensitive zones together with excessive amount of grou- ting works.
Project data
| Total length: | 2 613 m |
| Rail tunnels profile: | 36,2 – 42,1 m2 |
| Undergroung chambers profile 3pcs: | 234 – 383 m2 |
| Shafts 3 pcs, depth: | 26 – 35 m |
| Excavation volume: | 140 000 m3 |
| Rock bolts: | 55 000 m |
| Shotcrete: | 7 100 m3 |
| Grouting material cement: | 1 360 000 kg |
| Polyurethane: | 9 100 kg |
| Grouting time (pumps operational time): | 3 340 h |
Photogallery