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Tag: TBM Big Bertha
Roadbuilding
PHOTOS: Fixing Bertha: How workers dug a 12-story pit to raise world’s largest tunnel boring machine from the dead
No. 8 Story in 2015 « No. 9 No. 7 »  [imagebrowser id=194] The Big Bertha saga recently received a major update: crews with lead contractor Seattle Tunnel Partners have finished digging the 120-foot pit that will be used to access the world’s largest tunnel boring machine for necessary repairs. Now that the pit […]
February 11, 2015
Construction Equipment
Another mystery overheats, halts tunnel-boring machine Big Bertha once more
The Washington State Department of Transportation officials in charge of the world’s largest tunnel-boring machine have another mystery on their hands deep below Seattle. After finally getting moving again last week following a two-month period of downtime, Big Bertha has been halted once again. This time, for a different, and unknown, reason. Workers put Bertha […]
February 4, 2014
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