As of June, 2015 the Robbins 3.96 m-diameter Main Beam TBM has excavated more than 300 m for the 4.8 km new sewer tunnel in Kaneohe, Honolulu, Hawaii, US. The machine, nicknamed Pohakulani in Hawaiian, has been launched from a 23 m-deep starter tunnel and is boring at a rate of 12-15 m/day in basalt rock. Rock bolts, steel arches, wire mesh, and ring beams are being installed as necessary. Read the press release, click here for tunnelbuilder archive. Visit www.robbinstbm.com. 28/15.
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