Robbins Double Shield sees the light in SochiIn early March 2011, the 6.2 m-diameter Robbins Double Shield TBM crossed the finish line in Sochi, Russia. The machine completed a 4.5 km-long section of tunnel that will ultimately become part of the transportation infrastructure for the upcoming Olympic Games. The TBM advanced through difficult ground at average rates of 100-120 m/week for contractor OJSC Bamtonnelstroy, a division of the SK Most Company. The section of tunnel will ultimately become a service tunnel for Complex #3 - a section of Sochi's transportation infrastructure under construction, which includes road and rail tunnels. A second, 10.0 m-diameter Double Shield TBM, modified and repaired by Robbins site personnel, is currently excavating the parallel 4.6 km-long main railway tunnel using a continuous conveyor system for efficient muck removal. The TBM is currently 726 m into its portion of tunnel, with an expected completion date of March, 2012.Read the full press release. Visit www.robbinstbm.com, www.bamts.ru and www.skmost2014.com. 12/11. 6.2 m diameter Robbins Double Shield at Sochi