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Switzerland, Baregg - ch/39


  $75 million third 1.39 km-long three-lane tube with 143 sq m cross-section awarded to jv of Petsch, Ghelma, Baresel, and Hinteregger to be constructed using two roadheaders in sandstone, clay, silts and marl. Rockbolts, steel arches and shotcrete support. Preconsolidation carried out from 3.5 m-diameter x 320 m-long TBM exploratory drive which will now be extended by 700 m using 3.2 m Robbins TBM. Expected geological conditions poor, but construction should be complete for August 2003. Engineering by Gahler & Partner, www.gpag.ch Visit www.robbinstbm.com November 2000.