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Minneapolis, MN, United States

Robinson N.,Tunnels North America Nicole
Tunnels and Tunnelling International | Year: 2014

The mix of residential and commercial property is located on a steep hill. Glacially overridden, Seattle's topography varies enormously, and one of the new stations for the north-south University Link (U-Link) light rail extension is located atop Capitol Hill. TBM mining for the IJ-220 drives went extremely well, says Paul Gasson, program manager for the Seattle Tunnel and Rail Team (START JV), the construction management consultant for U-Link. For him one thing that really stands out is not just the unexpected speed at which the mining completed, but rather the lack of wear on the cutter heads. After the Montlake Cut the U-220 alignment enters a basin with long reaches of clay and buried river valleys. Then after the first mile of tunnel the machines entered another area with 200ft to 300ft of overburden, with an up hill grade of some four per cent. Source


Robinson N.,Tunnels North America Nicole
Tunnels and Tunnelling International | Year: 2014

March 2015 is the most recent deadline for the TBM to start mining again. Stalled underground for six months, by the time this issue goes to print, there are still many questions about damage to the machine, repair work and the cost in both time and dollars to the project. The Washington State Department of Transportation (WSDOT) is building the tunnel to replace the Alaskan Way Viaduct, which sustained damage after a 2001 earthquake and was deemed unlikely to survive another one. STP attempted to identify and remove any potential obstructions by installing wells approximately 120 ft deep near the TBM to lower water pressure in the ground, allowing workers to enter the excavation chamber at the front of the machine. Source


Robinson N.,Tunnels North America Nicole
Tunnels and Tunnelling International | Year: 2014

A Bus Rapid Transit system services downtown Ottawa, with around 180 buses, per hour, per direction, working their way through 14 lighted intersections. Meanwhile, vehicles, pedestrians and an ever-growing number of cyclists swarm through the same downtown corridor. More than 50 per cent of buses currently running will be deployed in suburban communities. Downtown, where the system currently operates at-grade in a bus only lane, bus traffic will be significantly reduced. Cross town buses will be replaced by IRT operations in the 2.5km underneath downtown, only local bus service will continue on surface streets. Running 12.5km, the 13-station line includes a 2.5km tunnel through the city's downtown to address a transit bottleneck. The tunnel's west portal will be located east of LeBreton Station, and there will be three underground stations (Downtown West, Downtown East, and Rideau) before the east portal located north of Campus Station. Source


Robinson N.,Tunnels North America Nicole
Tunnels and Tunnelling International | Year: 2015

A public-private partnership could construct a new rail tunnel under the Detroit River, making a freight connection between Canada and the US. The Continental Rail Gateway (CRG) operates the rail freight tunnel under the Detroit River. CRG now plans to build a replacement rail tunnel adjacent to the existing tunnel. Once the replacement is completed, all rail traffic, including large rail cars unable to pass through the existing rail tunnel will be transferred to the new tunnel. For this project, a 2.5km long tunnel will be mined by TBM below the river and parallel, some 45m to the west, to the river depth of 49.2ft, which is about 30ft deeper than the tubes of the existing tunnel. The project is estimated to cost USD400m, which includes building the 2.5km tunnel, installing safety equipment, electrical and mechanical equipment and other facilities. There still remains presidential permit from the Obama administration and cabinet approval from the government of Canada. Source

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