New Crystal Springs Bypass gets its TBM - PDF

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					New Crystal Springs Bypass gets its TBM
Anonymous
Mining Engineering; Dec 2009; 61, 12; Docstoc
pg. B7




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Description: A single-shield tunnel boring machine (TBM) was lowered 47 m (155 ft) to the launch shaft to begin tunneling the New Crystal Springs Bypass Tunnel (NCSBT), a 1,280-m- (4,200-ft-) long horizontal tunnel in San Francisco, CA.
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