Watch Bertha breaks through Seattle waterfront tunnel Department of Transportation s Big Bertha Highway 99 tunnel boring machine is lowered into its launch pit on Friday
Get PriceFor anyone wanting to get a peak under the shield of Bertha the 57 5 ft diameter tunnel boring machine that dug a 1 7 mile tunnel under downtown Seattle now is the time As work continues to
Get PriceBertha tunnel boring machine Bertha was a 57 foot diameter 17 4 m tunnel boring machine built specifically for the Washington State Department of Transportation s WSDOT Alaskan Way Viaduct replacement tunnel project in Seattle
Get PriceThe boring machine would also need to be designed so that sections of the cutting head could be removed and replaced from the inside of the machine to avoid the sorts of delays which Big
Get PriceAfter a two year delay for repairs Seattle s giant tunnel boring machine is on the verge of completing its mission far beneath the city s streets
Get PriceBertha tunnel boring machine 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
Get Price· A tunnel boring machine TBM also known as a mole is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata They may also be used for microtunneling They can bore through anything from hard rock to sand Tunnel diameters can range from a
Get PriceThe Bertha Crisis How Much Will the Delays Cost Seattle but naming the world s largest tunnel boring machine after her seemed appropriate Bertha is synonymous with big which the tunnel project is But Bertha was also supposed to represent enlightened progress in a city whose transportation system needed some good
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Get PriceIn July 2024 they bring in Bertha the largest tunnel boring machine in the world built specifically for the project by the Hitachi Zosen Corporation It s an engineering marvel
Get PriceBertha the world s largest tunneling machine has been stuck under downtown Seattle since it broke in December 2024 Engineers have had to concoct a massive and expensive rescue plan
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Get PriceSand Grinds World s Largest Tunneling Machine To A the world s largest tunneling machine Bertha is supposed to be boring a 2 mile highway tunnel under downtown Seattle but it got stuck in
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Get PriceLast month Bertha the world s biggest earth pressure balance boring machine finished digging a gigantic tunnel under the city of Seattle to replace a damaged highway viaduct The completed tunnel stretches 1 75 miles
Get PriceHere comes Big Bertha March 25 However the most frequent updates will come via a Twitter account BerthaDigsSR99 WSDOT launched on Bertha s behalf in December Check out this short video or view on Youtube to see the inner workings of a tunnel boring machine
Get PriceBig Bertha Seattle s famous tunnel boring machine is stuck underground again Anything but boring World s largest tunnelling machine Big Bertha is stuck under Seattle Tweets an interview
Get PriceThe front of tunnel boring machine Bertha is on pace to emerge from its deep access vault late Monday afternoon following a trouble free day of crane tests and hoisting Bertha T Tunneldigger Sp S on S so S red S
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Get PriceA giant tunnel boring machine called Bertha operating on CTRL contract 220 has reached a ventilation shaft
Get PriceThe cutterhead on Seattle s troubled tunnel boring machine broke through the wall of a rescue pit at midday Thursday Inslee Says Big Bertha To Resume Drilling Seattle Tunnel By Austin Jenkins •
Get PriceLast week marked Bertha s final push as a tunnel boring machine What was once the world s largest machine of its kind churned through a final five ft
Get PriceNot really the ideal shape for a tunnel but the easiest shape to produce with a boring machine Ideally it would be a parabolic arch with a flat base Can t bore that
Get PriceBertha which got stuck digging a Seattle highway tunnel is 60 feet below ground and can t move forward — or backward Now a rescue plan is underway to fix the five story tall machine
Get PriceBertha Seattle s tunnel boring machine is officially stuck According to a spokesperson with the Washington Department of Transportation the giant drill hit some kind of obstruction and can t
Get PriceWe re coming up on the second anniversary of Bertha s big break down The tunnel diggers hope to have her boring again on Dec 23 If she works that would be a nice albeit expensive
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Get PriceBertha the Seattle tunnel boring machine is now almost halfway done with the 385 foot distance under the Alaskan Way Viaduct And for the first time in more than two years it looks like part of the project could be done on time
Get PriceNamed 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 Blackstone reports on what the high tech
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