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Big Bertha's Two-Mile Subterranean Journey Is Almost Over

2017-1-25  Washington State Department of Transportation More than 150 feet below the streets of Seattle, Bertha presses on, boring a 57.5-foot diameter tunnel underneath the city. The largest tunnel

The Rest of the Bertha’s Journey Route Fifty

2021-4-30  SEATTLE — It wasn’t supposed to take this long, but “Bertha,” which launched as the world’s largest tunnel-boring machine in July 2013, finally emerged on April 4 in a concrete pit a few blocks from the Space Needle after its two-mile journey under the center of the Pacific Northwest’s largest city. While the new tolled tunnel and connecting roadways replacing the Alaskan Way Viaduct—the aging seismically vulnerable double-decker highway that carries State Route

Hard grind: The epic journey of the world's biggest tunnel

2017-5-1  Hard grind: The epic journey o 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

Bertha A Massive TBM’s 2 Mile Journey Underneath Seattle

2019-7-22  Bertha’s cutterhead covers the entire front of the machine. It has hundreds of steel teeth that break up the dense glacial soil and boulders encountered along the tunnel route. The soil moves through gaps inside the cutterhead. Some teeth rotate so that the right tooth is matched with the right task, such as grinding up big boulders.

Alaskan Way Viaduct Tunneling

After a series of tests, Bertha was launched into the soils beneath Seattle on July 30, 2013. This graphic divided the tunnel route into 10 zones, providing a visual aide to track Bertha's progress during tunneling. Click through the zones to learn about each section of the tunnel drive. Zone 1. Zone 2. Zone 3.

Big Bertha Is Digging Seattle's Massive Underground Freeway

2013-7-5  To do so, Seattle's using "Big Bertha:" the biggest Tunnel Boring Machine on Earth. The 2001 earthquake that brought down a length of State Route 99 running through downtown Seattle was a

Tunnel boring machine named Bertha begins digging new

2015-1-2  On July 30, 2013, Seattle Tunnel Partners begins digging a new State Route 99 tunnel underneath downtown Seattle using a tunnel-boring machine named Bertha. The machine is to dig a 57.5-foot-diameter tunnel -- the largest in the world at the time

The World's Largest Tunnel-Boring Machine

2013-11-11  In July, they unleashed Bertha, the world’s largest-diameter tunnel-boring machine. Built in Japan and reassembled in the U.S., Bertha is digging the 1.7-mile tunnel by advancing at an average

America's Biggest Tunnel-Boring Machine Is Stuck Beneath

2014-2-20  Bertha is part of a $3.1 billion plan to replace Seattle's aging Alaskan Way Viaduct with a bored tunnel, and the $80 million machine was going gangbusters at first, churning 30 feet per day...

Bertha is officially completely dismantled Curbed Seattle

2017-8-24  It’s the end of an era: Bertha, the much-maligned tunnel-boring machine that drilled the State Route 99 Viaduct replacement tunnel, has officially completely come apart.

Monster Machines: Big Bertha Is Digging Seattle's Massive

The 2001 earthquake that brought down a length of State Route 99 running through downtown Seattle was a measly 6.8 on the Richter scale. Seattle’s using “Big Bertha:” the biggest Tunnel

Bertha A Massive TBM’s 2 Mile Journey Underneath Seattle

2019-7-22  Bertha’s cutterhead covers the entire front of the machine. It has hundreds of steel teeth that break up the dense glacial soil and boulders encountered along the tunnel route. The soil moves through gaps inside the cutterhead. Some teeth rotate so that the right tooth is matched with the right task, such as grinding up big boulders.

Big Bertha: World's Largest Tunneling Machine To Be

2021-2-17  Chris Dixon, the project manager at Seattle Tunnel Partners, says that the pipe was not identified in the contract, and therefore is the state's responsibility. The pipe was installed in 2002 to monitor groundwater.#RIGHTNOW Air4 is over Bertha beginning to drill the State Route 99 tunnel beneath Downtown Seattle.

The World's Largest Tunnel-Boring Machine

2013-11-11  In July, they unleashed Bertha, the world’s largest-diameter tunnel-boring machine. Built in Japan and reassembled in the U.S., Bertha is digging the 1.7-mile tunnel by advancing at an average

Tunnel boring machine named Bertha begins digging new

2015-1-2  On July 30, 2013, Seattle Tunnel Partners begins digging a new State Route 99 tunnel underneath downtown Seattle using a tunnel-boring machine named Bertha. The machine is to dig a 57.5-foot-diameter tunnel -- the largest in the world at the time work starts, and designed to carry a double-decker highway with two lanes in each direction -- from

Big Bertha City of BH

This article was originally published in the LOS ANGELES BUSINESS JOURNAL on Jan. 12, 2015. To see the original click here: Los Angeles Business Journal_01122015, Big Bertha When the Beverly Hills School District and numerous Beverly Hills residents objected in 2011 to the Los Angeles County Metropolitan Transportation Authority’s altered plans to tunnel under Beverly Hills High School

Bertha KNKX

2015-8-22  The tunnel-boring machine known as Big Bertha will resume digging after longshoremen agreed to remove their picket line which had been in place since Aug. 20. Gov. Jay Inslee on Tuesday said the International Longshore and Warehouse Union Local 19 agreed to let the project resume despite an unresolved labor dispute with the project contractor

Crews line up target for Bertha's big exit DJC

2016-3-31  Crews line up target for Bertha's big exit at the north end of the tunnel route. Bertha will drive through the target and then onto a concrete cradle where the machine will be taken apart

Bertha is officially completely dismantled Curbed Seattle

2017-8-24  It’s the end of an era: Bertha, the much-maligned tunnel-boring machine that drilled the State Route 99 Viaduct replacement tunnel, has officially completely come apart. Seattle Tunnel Partners

Bertha breaks through: SR 99 tunneling machine emerges

2017-4-4  King County Metro will continue to rely on SR 99 to route buses to Seattle after the tunnel opens, said King County Executive Dow Constantine. “The new tunnel will provide fast, reliable travel for transit and freight past downtown traffic, and reunite the city with its waterfront,” said Constantine.

Bertha A Massive TBM’s 2 Mile Journey Underneath Seattle

2019-7-22  Bertha’s cutterhead covers the entire front of the machine. It has hundreds of steel teeth that break up the dense glacial soil and boulders encountered along the tunnel route. The soil moves through gaps inside the cutterhead. Some teeth rotate so that the right tooth is matched with the right task, such as grinding up big boulders.

tunnel boring machine big bertha Oblik

Meet Big Bertha, The World’s Largest Tunnel Boring Machine. Big Bertha was manufactured and supplied by the Hitachi Zosen Corporation to Seattle Tunnel partners for the SR 99 tunneling project. It measures 57.2 feet (57.2 m) in diameter, which makes it the largest tunnel boring machine in

Monster Machines: Big Bertha Is Digging Seattle's Massive

The 2001 earthquake that brought down a length of State Route 99 running through downtown Seattle was a measly 6.8 on the Richter scale. Seattle’s using “Big Bertha:” the biggest Tunnel

Big Bertha: World's Largest Tunneling Machine To Be

2021-2-17  Chris Dixon, the project manager at Seattle Tunnel Partners, says that the pipe was not identified in the contract, and therefore is the state's responsibility. The pipe was installed in 2002 to monitor groundwater.#RIGHTNOW Air4 is over Bertha beginning to drill the State Route 99 tunnel beneath Downtown Seattle.

The World's Largest Tunnel-Boring Machine

2013-11-11  In July, they unleashed Bertha, the world’s largest-diameter tunnel-boring machine. Built in Japan and reassembled in the U.S., Bertha is digging the 1.7-mile tunnel by advancing at an average

Bon Voyage, Big Bertha! Seattle Digs a Cave For the Future

2013-7-31  Big Bertha Is Digging Seattle's Massive Underground Freeway. The 2001 earthquake that brought down a length of State Route 99 running through downtown Seattle

Big Bertha City of BH

This article was originally published in the LOS ANGELES BUSINESS JOURNAL on Jan. 12, 2015. To see the original click here: Los Angeles Business Journal_01122015, Big Bertha When the Beverly Hills School District and numerous Beverly Hills residents objected in 2011 to the Los Angeles County Metropolitan Transportation Authority’s altered plans to tunnel under Beverly Hills High School

Crews line up target for Bertha's big exit DJC

2016-3-31  Crews line up target for Bertha's big exit at the north end of the tunnel route. Bertha will drive through the target and then onto a concrete cradle where the machine will be taken apart

Bertha is officially completely dismantled Curbed Seattle

2017-8-24  It’s the end of an era: Bertha, the much-maligned tunnel-boring machine that drilled the State Route 99 Viaduct replacement tunnel, has officially completely come apart. Seattle Tunnel Partners

Bertha breaks through: SR 99 tunneling machine emerges

2017-4-4  King County Metro will continue to rely on SR 99 to route buses to Seattle after the tunnel opens, said King County Executive Dow Constantine. “The new tunnel will provide fast, reliable travel for transit and freight past downtown traffic, and reunite the city with its waterfront,” said Constantine.