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Tag: Big Bertha Seattle
Roadbuilding
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 last week, breaking through a thick wall of concrete and into a 12-story pit. According to a report from the Associated Press, the world’s largest tunnel-boring machine moved 57 feet since February 17 to enter […]
March 9, 2015
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
Drilling delays a problem for tunnel-boring machine Big Bertha even as she slumbers below ground
Crews in Seattle are now expected to finish digging a 12-story pit to reach stalled tunnel-boring machine Big Bertha one month later than planned due to concrete pilings proving more difficult to drill through than expected, according to a report from the Seattle Times. Bertha, the world’s largest tunnel-boring machine went down from overheating in late January, […]
July 31, 2014
Construction Equipment
Repairs to Big Bertha will include 86 tons of steel reinforcement to tunnel-boring machine’s bearing, cutter drive
The largest tunnel-boring machine in the world needs a bit of reinforcement against the “wet and abrasive soils” deep below Seattle, according to a report from the Seattle Times. As such, repairs for Big Bertha will include the installation of 216 steel ribs and plates that will add 86 tons to the 7,000-ton machine, the paper […]
June 18, 2014
Construction Equipment
Before Bertha repairs begin, archaeologists will test soil for artifacts
Before workers in Seattle begin to dig a 12-story pit to make the necessary repairs to get the world’s largest tunnel boring machine running once again, they must step aside to allow archaeologists to search the soil for artifacts. Sixty vertical holes were drilled into the soil 48 feet above dormant Big Bertha, the tunnel-boring […]
March 25, 2014
Construction Equipment
Tunnel-boring machine Big Bertha shut down for “months” due to complexity of needed repairs
Washington State Department of Transportation officials say Big Bertha, the world’s largest tunnel-boring machine, is likely out of commission for months. An inspection conducted after the machine overheated in late January found that several cutterhead openings were clogged with dirt along with considerable damage to seals around the machine’s main bearing, according to a report […]
February 11, 2014
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
Construction Equipment
Big Bertha, world’s largest tunnel-boring machine, arrives in Seattle
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. She’s quite hefty too. Bertha is assembled from 41 parts, the largest of which weighs in at 900 tons. And she […]
April 4, 2013
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