tunnel boring machine
The Alaskan Way Viaduct has sunk nearly half-an-inch at one location where a machine has been boring a highway tunnel under downtown Seattle.
Seattle’s massive tunneling operation is on hold yet again due to ongoing problems with the world’s largest boring machine, officials said Friday.
The giant machine digging a highway tunnel under Seattle is expected to resume light work this week, but officials still don’t know what stopped the giant drill for nearly two months, the Washington State Transportation Department said late Monday.
Crews have found a hard object more than 3 feet wide lodged in the tunneling machine that’s currently stalled 60 feet under the city of Seattle, officials said Wednesday.
The state Department of Transportation said Friday the 8-inch-diameter pipe was discovered protruding through an opening in the machine’s cutter-head.
The huge machine drilling a highway tunnel under downtown Seattle remains stalled by a mysterious blockage.
The contractors drilling a tunnel under downtown Seattle are closer to finding out what has blocked their boring machine.
The $80 million machine is designed to break up boulders, so what it hit is a mystery. It may be a huge boulder left by the last ice age. Others think it could be a buried rail car from pioneer days when the area was filled in.
Boring at Seattle’s $2 billion tunnel project has been delayed again until next week.
The world’s widest tunnel boring machine arrives in Seattle in pieces Tuesday aboard a ship from Japan.