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Jobs Done Well. Kiewit Underground is a leader in the tunneling industry. Headquartered in Omaha, Neb., we construct underground facilities across the U.S. and Canada. We have proven tunneling experience with a variety of tunneling and excavation methods. Our roadheader projects include: Roadheader Devil’s Slide Tunnels This tunnel is constructed through granitic, sandstone, and shale formations using both roadheader and drill-and-blast excavation methods. Ground support includes a combination of shotcrete, rock bolts, and lattice girders installed sequentially with excavation. Primary tunneling equipment includes AM105 roadheaders, Sandvik drill jumbos, Potenza shotcrete robots and Sandvik bolters. A reinforced cast-in-place concrete lining is placed upon completion of excavation. Wheeler Gulch Tunnel The Wheeler Gulch project included the excavation of a 3,200-foot-long tunnel 24 feet wide by 20 feet tall. The tunnel was excavated using an Alpine ATM 105 roadheader. Dywidag rock bolts and welded wire mesh were then installed for rock support. The portal face is supported with 20- and 30-foot spilling bolts as well as shotcrete and welded wire mesh. El Túnel (North Road Reconstruction) This project included the construction of a 613-foot-long, 14-foot-diameter water conveyance tunnel through the Diamond Drive embankment. A road header performed the excavation. A top heading and bench removal process was used. The tunnel was lined with reinforcing steel and 1-foot-thick shotcrete.
