Settling soil has caused a contractor building the Highway 99 tunnel beneath downtown Seattle to stop work on a pit being dug to reach a stalled digging machine known as Bertha, the state said.
Washington state archaeologists who took a look at shell deposits found by crews digging a 120-foot-deep pit that will provide access to a stalled Seattle tunneling machine have given the all-clear signal for work to proceed.
Bertha, the broken-down tunneling machine, moved forward three feet during recent testing, while workers building an underground circular pit that will allow access to the machine finished installing the last of 84 large concrete cylinders known as piles.
An effort to repair the giant tunneling machine stuck under downtown Seattle is going more slowly than expected.
Wash. DOT says many of Big Bertha’s cutter-head openings are clogged with dirt and debris.
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 Transportation Department says help is on the way for a massive machine that became stuck last month while boring a tunnel under downtown Seattle.
The state Department of Transportation said Friday the 8-inch-diameter pipe was discovered protruding through an opening in the machine’s cutter-head.