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Tunnel timeline: From conception to tunnel completion to

Dec 13, 2019Seattle Tunnel Partners Project Director Chris Dixon said repairing Bertha has taken longer than anticipated. Read more. Testing on Seattle’s tunnel boring machine was stopped temporarily due to

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Seattle tunnel machine Bertha back to work after maintenance

Jul 19, 2016SEATTLE -- Bertha the tunnel machine is rolling again. The massive machine boring a tunnel to replace the State Route 99 Alaskan Way Viaduct stopped drilling on June 23

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Bertha (tunnel boring machine) Wikipedia

Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57.5 feet (17.5 m) across. The machine was 326 feet (99 m) long and weighed 6,700 short tons (6,100 t). The machine itself cost $80 million and is owned by Seattle Tunnel Partners, the project contractors.

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Bertha to resume digging Seattle tunnel Monday

Dec 18, 2015SEATTLE (AP) — Seattle's broken down tunnel boring machine should get back to work Monday after a pipe stopped progress on a new State Route 99 more than two years ago.

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Who Killed Bertha? Why the Seattle Tunnel Disaster Isn't

Bertha’s in heavy rotation (above): A giant red crane slowly rotates the SR 99 tunneling machine’s front end from a horizontal to a vertical position as it is lowered into the access pit on Aug. 24, 2015, two years after the incident occurred. This story follows our feature story, "Spin Zone," which appeared in the October 2017 issue of Seattle Business magazine.

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Seattle’s tunnel machine Bertha reaches pit stop; workers

Jun 23, 2016Bertha, the SR 99 tunneling machine, is nearly a third of the way along its path to create a new underground roadway in Seattle. On Thursday it stopped for

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Mystery of Seattle's Tunnel Borer Blockage Solved

The great Seattle mystery has been solved: The object blocking the world's largest tunnel boring machine isn't an old steamship or locomotive or alien spaceship it's an 8-inch-diameter steel pipe.

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Bertha to resume digging Seattle tunnel Monday

Dec 18, 2015SEATTLE (AP) — Seattle's broken down tunnel boring machine should get back to work Monday after a pipe stopped progress on a new State Route 99 more than two years ago.

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Another Seattle tunnel drill (not Bertha) damaged, needs

Feb 11, 2016Bertha isn’t the only tunnel machine to crack in Seattle soil. Drilling at Sound Transit stopped for six weeks when hard soil damaged five motors and

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Bertha stops digging again, but this The Seattle Times

Jan 12, 2016The recently repaired tunnel-boring machine Bertha stopped digging early Tuesday, after a barge tilted, damaged a dock and spilled excavated dirt

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Seattle's tunnel: SR's got 99 problems, but the steel pipe

Seattle Tunnel Partners has told WSDOT that the machine should be able to mine at a rate of about 65-feet to 72-feet per day. So far, Bertha’s biggest day was about 52-feet.

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Seattle's Big Bertha Tunneling Machine Is Finally Back on

Jan 08, 2016Five stories tall and the biggest drill of her kind, Bertha overheated in December 2013, only about a ninth of the way into the project to bore a tunnel under downtown Seattle.

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What's Blocking Bertha, Seattle's 5-Story Tunneling

Dec 12, 2013"Transportation crews still don't know what exactly is blocking the path of 'Bertha,' the giant boring machine that's drilling the new Highway 999 tunnel under Seattle. The machine was stopped

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What Blocked Seattle Tunnel: A Lowly Pipe

Jan 06, 2014The mystery underground object that had been blocking the giant Big Bertha tunnel boring machine under Seattle turns out to have been something pretty boring: An 8

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Bertha, Seattle's SR 99 Tunneling Machine, Is Finally Done

Apr 04, 2017Bertha has broken through. After nearly four years underground, Seattle’s beleaguered boring behemoth clawed its way into daylight yesterday, leaving a 1.7-mile tunnel behind it.

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Alaskan Way Viaduct Tunneling

The tunneling machine known as Bertha began tunneling beneath Seattle in July 2013 (photo at right: the machine's cutterhead being lowered into the launch pit near Seattle's stadiums). The machine completed its tunneling on April 4, 2017 and was fully dismantled and removed from the tunnel

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Seattle tunnel delays: Why the project is 3 years late

Sep 19, 2018By April 2016, Bertha was back on track with just one more course correction in March 2017. Seattle Tunnel Partners discovered Bertha had

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While Bertha halts over barge issues, sinkhole opens near

Seattle's giant tunnel boring machine, Bertha, is on pause again for a couple of days. And this time, with a sinkhole in her wake. Tunneling on the project to replace the Alaskan Way Viaduct came

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Alaskan Way Viaduct Replacement Transforming Seattle WSP

In December 2013, tunnel progress hit an unexpected delay when the TBM stopped and had to be repaired before it could continue mining. Bertha started up again in February 2016 and on April 4, 2017, Bertha broke through into the disassembly pit and shortly thereafter built the tunnel’s final ring.

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Big Bertha Equipment World

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

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What's Blocking Bertha, Seattle's 5-Story Tunneling

Dec 12, 2013"Transportation crews still don't know what exactly is blocking the path of 'Bertha,' the giant boring machine that's drilling the new Highway 999 tunnel under Seattle. The machine was stopped

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Alaskan Way Viaduct Tunneling

The tunneling machine known as Bertha began tunneling beneath Seattle in July 2013 (photo at right: the machine's cutterhead being lowered into the launch pit near Seattle's stadiums). The machine completed its tunneling on April 4, 2017 and was fully dismantled and removed from the tunnel

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What's stopping big Bertha? Seattle debates mysterious

Dec 21, 2013SEATTLE — In a city known for a giant needle pointing toward space, everyone is talking about a massive machine stuck underground.They call her Bertha, a 57-foot-wide, earth-eating tunnel

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Bertha’s Rescue Shaft Malcolm Drilling

Bertha has stopped all forward progress after just 1,000-ft of mining the new SR99 transportation tunnel currently being built below downtown Seattle, Washington. The stalled TBM is currently 80-ft below the surface. After vetting all possible repair/rescue methods, Seattle Tunnel Partners decided that accessing Bertha with a vertical shaft

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Alaskan Way Viaduct Replacement Transforming Seattle WSP

In December 2013, tunnel progress hit an unexpected delay when the TBM stopped and had to be repaired before it could continue mining. Bertha started up again in February 2016 and on April 4, 2017, Bertha broke through into the disassembly pit and shortly thereafter built the tunnel’s final ring.

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Big Bertha Equipment World

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

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Bertha reaches finish line of Seattle tunnel KIRO

Apr 05, 2017With tumbling concrete and a choking cloud of dust, the tunnel machine Bertha broke through to daylight, completing a 1.7-mile drive from Seattle's Pioneer Square to

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Half-way milestone for TBM Bertha TunnelTalk

Bertha has now completed the steepest 4.6% downgrade section of the drive, and currently rests at a location under Spring Street in downtown Seattle at a depth of 120ft (36.5m) below the tunnel crown.

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Big Bertha Lawsuits—Hitachi Zosen Weighs In ACS Lawyers

Jan 17, 2018In a recent article published by Seattle Business Magazine, the Japanese manufacturer of the much-maligned tunnel machine (nicknamed “Bertha”) provided its version of events and its position to the public. The interview took place after executives from Hitachi Zosen were not invited to the ceremony celebrating Bertha’s breakthrough at the end of its two-mile journey []

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State: Bertha to get back to work by next March

Apr 21, 2014Bertha stopped moving in December, after hitting an obstruction about one-tenth of the way into the 1.7-mile dig, which is the centerpiece of the $3.1 billion project to replace the aging

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Bertha Equipment World magazine

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

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What's stopping big Bertha Seattle debates mysterious

Dec 21, 2013What's stopping big Bertha Seattle debates mysterious object obstructing tunnel machine JZ Knights How Seattle chose the Bertha tunnel alternative

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Alaskan Way Viaduct Wikipedia

The Alaskan Way Viaduct was an elevated freeway in Seattle, Washington, United States, that carried a section of State Route 99 (SR 99). The double-decked freeway ran north–south along the city's waterfront for 2.2 miles (3.5 km), east of Alaskan Way and Elliott Bay, and traveled between the West Seattle Freeway in SoDo and the Battery Street Tunnel in Belltown.

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Seattle tunnel, among world's biggest, takes step toward

Apr 04, 2017Bertha, the world's largest tunnel-boring machine, stopped working in December 2013 after digging just 10 percent of a planned tunnel to replace an aging waterfront highway, leaving crews

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