At 10.45am, on 7 October 2002, in Atlanta, Georgia, the first Robbins TBM broke through on the southbound drive of the US$113M Chattahoochee tunnel in Cobb County.
Contractor Gilbert/Healy JV is constructing the 16.3km long, 5.3m i.d. tunnel, using two TBMs at depths between 39.5m and 115m.
The second Robbins TBM, which set of at the beginning of this year on the north drive, has about 1km to go.
The tunnel will feed the RL Sutton reclamation facility near Chattahoochee River, and the finished system is scheduled to come on-stream in October 2003.
More details in November’s T&TI
