"Cyclops" monitors buildings' movement above Seattle tunnel dig

08/2/2013 | KCPQ-TV (Seattle)

Source: KCPQ-TV

"Cyclops" devices are set up above ground along the route of Bertha, the tunnel-boring machine that is digging a tunnel to replace the Alaskan Way Viaduct along the Seattle waterfront. These one-eyed devices shoot lasers "at a point that’s been pre-established on the buildings" to track Bertha’s movements and detect any shifting of the 200 buildings above the tunnel route. "The accuracy of these devices is like a thousandth of an inch, so any kind of shift in the building we can detect," said Dave Sowers, engineering manager on the project.

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