Client
Greenland Energy Authority , Greenland
Superior Contractor
ÍSTAK Greenland, Greenland
Construction period
October 2007 – October 2009
Objects description:
- access service tunnel to the underground powerhouse
- underground powerhouse
- tailrace tunnel
- main headrace tunnel
Construction technology:
All underground galleries were excavated by drilling and blasting works, NMT (Norwegian Tunnelling Method).
Executed works:
- driving of access service tunnel, length 125 m, profile 26,3 m2
- transformer hall, length 25 m, profile 58 m2
- underground storage niche, length 12 m, profile 49 m2
- driving of underground powerhouse, dimensions lxwxh – 28x11x23 m
- associated penstock and draft tubes with variable profile from 7 m2 to 18 m2, the total length 72 m
- driving of the main headrace, length 4 200 m, profile 18 m2
- adit tunnel length 125 m, profile 26 m2
- surge tunnel, length 270 m, profile 22 m2
- pressure tunnel, length 400 m, profile 22 m2, inclination 12.5%
- the shaft for power intake gates, depth 9,5 m, dimensions 4,5×4,5 m
- local primary support of tunnels by using of steel fibre reinforced shotcrete and rock anchors CT