Gravity Pipeline May 2020

Shield Components

After Salus completed its first drive late-March, the Barnard-Bessac Joint Venture (BBJV) crew began disassembling the Tunnel Boring Machine (TBM) at the Inner Bair Island Shaft retrieval site.

Completed major section removal includes:

  • Middle shield cover – during tunneling this shield acts as a protective structure for the workers. It also functions as a temporary support structure so concrete segment can be installed while Salus tunnels forward.
  • Screw conveyor – assists in efficiently transporting excavated soil onto a conveyor belt that sends it out behind Salus
  • Cutter head – the front segment of Salus responsible for cutting and excavating through the soil



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