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December 26, 2015 02:00 pm
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/rbaZ5HMWrQw/seattles-behemoth-boring-machine-idle-since-2013-makes-some-progress
Seattle's Behemoth Boring Machine, Idle Since 2013, Makes Some Progress
After being blocked by an obstruction ("the object") which left it idle just over two years ago, repair work has continued on Bertha, Seattle's enormous tunnel-boring machine. Now, reports KOMO News and The Seattle Times, Bertha is once again ready to work. From The Times' coverage:Tuesday morning's push of one and a half feet provided Seattle Tunnel Partners (STP) enough space behind Bertha’s drive motors to fasten the next concrete ring at the 1,085-foot mark of the planned 9,270-foot tube. Chris Dixon, STP project manager, is calling this a testing phase. The team is measuring how Bertha responds while rotating through heavy loads of compacted sand. Last week, a fixed steel arm in the front end broke and needed a one-day repair. ... This week’s two-day push would leave the nose of the drill just short of the north edge of the concrete vault, dug in 2014 so STP could reach and lift the 4million-pound front end for repairs. The winning bid from STP called for the tunnel to be completed this month.Read more of this story at Slashdot.
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/rbaZ5HMWrQw/seattles-behemoth-boring-machine-idle-since-2013-makes-some-progress
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