Thursday, 1 August 2013

World's largest tunneling machine digs in

Bertha, the world’s largest tunnel boring machine (TBM), started digging under Seattle on Tuesday as it chewed through the north wall of the 80-ft (24.3 m) deep trench where it was assembled after being shipped in pieces from its manufacturer in Japan. Designed to bore a 1.7 mi (2.7 km) tunnel for State Route 99 (SR 99) under the Seattle city center to replace the old viaduct, the machine will both dig out soil and lay a concrete tunnel wall as it goes. .. Continue Reading World's largest tunneling machine digs in

Section: Architecture

Tags: Construction, Transport, World's Largest

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