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On April 4, the world's largest tunnel boring machine broke through to the open air after almost four years underground. Called Bertha, the giant digger was tasked with the challenge of building a tunnel large enough to carry four lanes of motor traffic under the heart of Seattle.
Life has not been entirely kind to Bertha, the largest tunnel boring machine in all of North America. About two years ago, the machine, which measures 57 feet tall and 325 feet long, started excavating a two-mile tunnel under downtown Seattle.
Apr 03, 2017 · Bertha, one of the world's largest tunnel boring machines, emerged north of downtown Seattle on Tuesday.
The world's largest tunnel-boring machine which is building a multi-billion dollar underground highway beneath Seattle has finally completed its missions - three years later than planned. Pictures show the machine, known as Bertha, breaking through a concrete wall as it reached the end of its ...
Read more about the technical challenges and rising costs of the Highway 99 tunnel project, and the successes and travails of Bertha, the biggest-ever boring machine.
Dec 24, 2013 · Named after one of Seattle's early mayors, the $80 million drill Big Bertha is 326 feet long, weighs 6,700 tons, and does much more than drill. John Blacksto...
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.
Bertha's end could be near. The world's largest tunnel-boring machine is on schedule to break into daylight this spring after a tumultuous dig under downtown Seattle that's years behind schedule.
Follow Bertha Thank you for following Bertha. The SR 99 tunneling machine, nicknamed Bertha, has completed her work. For the latest tunnel progress, visit our new tracker page.
Two workers, who request anonymity, suggest the tunnel-boring machine was pushed beyond its limit by a foolhardy contractor.
A tunnel boring machine ... Bertha completed boring the tunnel on April 4, ... 2.M-30 EPB Tunnel Boring Machine - the largest built in the world;
Aug 01, 2014 · The world's biggest tunnel-boring machine, nicknamed Bertha, is awaiting repairs, and getting it going again will be an engineering feat in itself.
Apr 03, 2017 · WIRED's biggest stories delivered to ... Bertha the tunneling machine broke through a new concrete wall into ... even when compared to other boring ...
Bertha, the world's largest tunneling machine, has been stuck under downtown Seattle since it broke in December 2013. Engineers have had to concoct a massive and expensive rescue plan—essentially a whole construction project in itself.
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.
Dec 19, 2013 · Something unknown, engineers say, has blocked the progress of the biggest-diameter tunnel-boring machine in use on the planet.
Jul 22, 2017 · On April 4, the world's largest tunnel boring machine broke through to the open air after almost four years underground. Called Bertha, the giant digger was ...
SEATTLE — The world's largest tunnel-boring machine broke through a concrete wall beneath Seattle on Tuesday to reach the end of its long, troubled...
Perhaps you've heard of Bertha, the World's Largest Tunnel Boring Machine or TBM? She's currently working her way underneath Downtown Seattle, excavating the Alaska Way Bored Tunnel to replace the aging Alaska Way Viaduct.
On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle. "Bertha," as it's known, will spend the next 14 months boring a 1.7 mile (2.7 km) tunnel under the city to replace a viaduct damaged in a 2001 earthquake.
The machine, known as Bertha, ... Contractors building a highway tunnel under Seattle are preparing to remove the world's largest boring machine so that it can be ...
The World's Largest Tunnel-Boring Machine Must Be Saved. Bertha has stalled deep beneath Seattle, leaving the city's planned waterfront renaissance hanging in the balance.
From the dark depths beneath Seattle, Bertha the SR 99 tunnel machine headed out of the muck and into daylight on Tuesday, completing a final push in a years-long effort to create space for a new highway beneath the city.