Largest arduous rock TBM within the U.S. to dig tunnel designed to supply 100-year flood safety


Designed to supply 100-year flood safety for east and southeast Dallas, the 11.6 m (38.1 ft) diameter Robbins Primary Beam TBM will excavate the 8 km (5 mi) Mill Creek Drainage Aid tunnel. The biggest arduous rock TBM ever to bore within the U.S, the machine will change dimension partway via the bore, to a extra compact 9.9 m (32.5 ft). 



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