The First Continuous Conveyor Behind a TBM

In 1963, the world’s largest TBM at the time, an 11.20 m diameter Robbins Main Beam, was built for the Mangla Dam Project.  The unique project used a coal mine conveyor developed by James Robbins and Goodman, rather than muck cars, in the industry’s first-documented use of continuous conveyors for TBM tunneling. Muck was removed continuously from five TBM tunnels bored at the remote jobsite, making the prototype a great success.