Tunnel boring machine - Wikipedia

The World's Largest Tunnel-Boring Machine Must Be Saved. Bertha has stalled deep beneath Seattle, leaving the city's planned waterfront renaissance hanging …

Tunnel Boring Machines | The Robbins Company

Tunnel Boring Machine (TBM) A tunnel boring machine (TBM) also known as a “mole“, is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.They can bore through hard rock, sand, and almost anything in between. Tunnel diameters can range from a metre (done with micro …

How a Tunnel-Boring Machine Drills Underground - YouTube

> Tunnel Boring Machine (TBM) The existing tunnels of the CBBT were constructed using an immersed tube method, in which U-shaped trenches were prepared in the Bay bottom for each of the tunnel sections that were previously fabricated and outfitted before being floated out and sunk into place.