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Tag: Big Bertha progress
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
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