Robbins TBM all wrapped up in Iceland

May 27, 2008

Tunneling at the massive Kárahnjúkar Hydroelectric Project is now complete with the recent breakthrough of a Robbins TBM at the Jökulsá Diversion Tunnel. On April 9, 2008, the 7.2 m (23.7 ft) diameter machine ended its record-setting 8.7 km (5.4 mi) long drive. The breakthrough brings to a close nearly 50 km (31 mi) of bored tunnels using three Robbins machines and spanning four years of construction.

Contractor, Impregilo SpA achieved three world records with the Robbins Jökulsá machine, including 115.7 m (380 ft) excavated in 24 hours and 428.8 m (1,400 ft) in one week!  Previously, the machine also excavated an 11.1 km (6.9 mi) long section of the main headrace tunnel bringing water from the Hálslón reservoir to the powerhouse.

The Jökulsá Diversion Tunnel is part of the last stage of construction, adding additional water from Ufsarlón Watershed to the main headrace tunnel.  Concrete work is ongoing in the bored tunnel -- floors are being concreted and the walls are being lined with mesh and shotcrete.  Water will begin flowing through the tunnel in early August 2008.

The Robbins Company

29100 Hall Street
Solon, OH 44139

Brianna Home, Marketing Director
Phone: +1 253 872 4484

Desiree Willis, Technical Writer
Phone: +1 253 872 4490

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