Project started in 10/2007 and completed in 2009.

Project type: The High power cable tunnel..

Location: a Southern part of Stockholm (Sweden) .

The City of Stockholm, together with Fortum, it intends the replacing of current 220 kW power transmission lines with cables in a tunnel. The purpose is to acquire a land for complementary residential development and improve the environment for the inhabitants..

NATM (New Austrian Tunnelling Method) sequential method drill and blast. Explosives: Side sensitive emulsion. Excavator: Haggloader HR 10 .

Three access tunnels, ca 300 m each: Bolidenplan in the east, Ostberga in the centre and Solberga in the west. Cross section: 27,3 m2. The main tunnel, 18,3 m2, depth 20-50 m. Total 6 400 m. The main tunnel Solberga, single front, ca 1 050 m. The main tunnel Ostberga, double(triple) front, ca 1 350 m, 900 m and 500 m. The main tunnel Bolidenplan, double front, ca 1 700 m and 900 m. Continuous pre-grouting, 3 classes. Five vertical equipped shafts and superstructure. Rock conditions: Scandinavian granite, gneiss 20 - 60 under the ground.

Project started in 2006 and completed in 2008.

Project type: City Highway tunnel.

Location: , Baden Wurthemberg, Germany.

Bypass Tunnel of B14 for the city of Winnenden near Stuttgart with two 2-lane tubes. The length of each tunnel is 380m in cut & cover section and 660m in mined construction of appr. 90m2 cross section.

NATM (New Austrian Tunneling Method) sequential method drill and blast as well as excavator.

Four cross connections and a water retention basin were also part of the project. An emergency bay, niches and built in components were constructed due to recent safety standards. The contract of STI contained the whole excavation and final concrete lining works.