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Tag: Bertha tunneling machine
Roadbuilding
Bertha stopped after veering off course in home stretch of Seattle’s SR 99 tunnel
Seattle Tunnel Partners (STP) stopped Bertha, the largest tunnel boring machine in the world, on Feb. 28 to make adjustments before it continues on its last 1,000 feet of the 9,270 tunnel for SR 99. Officials report recent surveys indicate the machine is potential out of alignment by several inches. “STP is conducting additional survey […]
March 3, 2017
Roadbuilding
Bertha will soon begin digging below the viaduct its path will replace
The world’s largest tunneling machine will soon begin its dig beneath the Alaskan Way Viaduct in Seattle, its first activity since mid-March. In January tunnel-boring machine Bertha broke through its repair wall following two years of down time only to be brought to a halt once again later that month at the order of Washington Gov. […]
April 27, 2016
Roadbuilding
Bertha back to drilling after suspension is “conditionally lifted”
Bertha hasn’t been blessed with the best of luck in Seattle, but the world’s largest tunnel boring machine is back to drilling again for now. The Seattle Tunnel Partners announced that the Washington State Department of Transportation has decided to conditionally lift the suspension for cause that Gov. Jay Inslee enacted in January following the formation of a sink […]
February 26, 2016
Roadbuilding
Washington governor halts Bertha tunneling after sinkhole forms
Bertha didn’t get back to work for long. Washington Gov. Jay Inslee has put the brakes on the massive tunnel boring machine once again after a sinkhole formed. According to King 5, Inslee announced on Thursday that the machine boring the tunnel for the new State Route 99 in Seattle had to be halted over safety […]
January 18, 2016
Roadbuilding
Bertha breaks through repair wall and begins tunneling soil once more
It’s taken two years in repairs and delays, but Bertha has broken through her concrete repair pit. The Washington State Department of Transportation said in a press release last week that the world’s largest tunnel-boring machine had broken through the pit and mined 73 feet in a little more than three weeks. The Seattle Tunnel Partners were […]
January 13, 2016
Construction Equipment
Bertha, world’s largest tunneler, resumes digging below Seattle after 2-year delay
Though the contractor behind the Washington state Highway 99 project said it might give crews a holiday break before resuming the dig, Bertha, the world’s largest tunnel-boring machine, made its first progress in two years deep below Seattle last week. According to an announcement from the Washington State Department of Transportation, Bertha moved forward 1.5 feet Dec. 22, giving […]
December 28, 2015
Roadbuilding
Bertha is nearly ready to start tunneling again
The massive tunnel-boring machine that’s been sidelined in Seattle for two years could be back to boring by New Year’s. The Washington State Department of Transportation announced that the Seattle Tunnel Partners had begun the final preparations before drilling gets started again with soil and sand being poured into the 120-foot-deep access pit on Sunday. Bertha […]
December 17, 2015
Construction Equipment
Big Bertha, world’s largest tunnel-boring machine, arrives in Seattle
The “Big” in Bertha’s name isn’t there for the catchiness. It’s there because it’s apt. With a 57-foot diameter and a length of a football field, Big Bertha is the world’s largest tunnel-boring machine. She’s quite hefty too. Bertha is assembled from 41 parts, the largest of which weighs in at 900 tons. And she […]
April 4, 2013
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