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world’s largest tunnel-boring machine
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 ...
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 ...
Bertha breaks through repair wall and begins tunneling soil once more (VIDEO)
It's taken two years in repairs and delays, but Bertha has broken through her concrete repair pit. The Washington State Department of Transportation ...
VIDEO: 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 ...
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Bertha is nearly ready to start tunneling again (VIDEO)
The massive tunnel-boring machine that's been sidelined in Seattle for two years could be back to boring by New Year's. The ...
Bertha delayed again; won’t restart drilling until late December
The Seattle Tunnel Partners have once again delayed the restart of drilling for the State Route 99 tunnel, with Bertha not expected ...
PHOTOS > Big Bertha gets her head together: How to repair the world’s largest tunnel machine
With the final repairs having been made earlier this summer and Big Bertha finally picked back together underground, Washington State ...
Board rules WSDOT should have given contractor more warning about pipe struck by Big Bertha before stall
In regard to the drilling of the new State Route 99 tunnel below Seattle, the Washington State Department of Transportation ...
Water main damaged by Big Bertha repair excavation could cost WSDOT $4 million
Four months after crews temporarily stopped excavation on a repair pit for the world's largest tunnel-boring machine due to ground sinkage, ...
PHOTOS: Big Bertha’s 2,000-ton front end lifted to the surface. How the world’s largest tunneler was raised
After a year of slumber and almost a month after chewing her way into a 12-story repair pit, Big Bertha, the ...
VIDEO: Big Bertha breaks through: tunnel-boring machine enters repair pit, ready for disassembly
Though she remains very far from being done, Big Bertha completed a very important leg in her journey beneath Seattle ...
Big Bertha wakes from one-year nap, begins to chew her way into repair pit
For the first time in more than a year, Big Bertha actually bored. According to a report from the Seattle Times, the world's largest ...
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VIDEO: Watch as a massive Komatsu PC8000 mining shovel is assembled in this time-lapse
VIDEO: Entire Erques Bridge construction chronicled in beautiful time-lapse
Cat to end track drill production, intends to sell room and pillar underground mining machine business
John Deere unveils 2 large-frame skid steers, 2 CTLs in G Series power boost
With VP Henricks's retirement, Caterpillar cuts more jobs in consolidation of tech, R&D efforts
Unsafe surroundings: Unrecognized hazards could cause trouble for you – or for someone else
GO TO SAFETY WATCH
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compact track loaders
John Deere unveils 2 large-frame skid steers, 2 CTLs in G ...
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Cat to end track drill production, intends to sell room and ...
by Wayne Grayson