i miabertha tunnel boring machine specifications
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    The World's Largest Tunnel-Boring Machine Must Be Saved. Bertha has stalled deep beneath Seattle, leaving the city's planned waterfront renaissance hanging in the balance.

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    Metro Gold Line Eastside Extension: Tunnel Boring Machine Fact Sheet Extensión hacia el Este de la Metro Gold Line Hoja de datos de la Máquina Perforadora de Túneles

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  • Big Bertha, world's largest tunnel-boring machine, arrives in ...

    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.

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    Steel pipe in the way of Seattle tunnel-boring machine Big Bertha ... 3 Jan 2014 ... SEATTLE — Experts say they've at least partially solved the mystery of what's been blocking a massive tunnel-boring machine beneath downtown Seattle for the past month: a steel pipe.

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    Tunnel Boring Machine (TBM) A tunnel boring machine (TBM) also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.

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    On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle. "Bertha," as it's known, will spend the next 14 months boring a 1.7 mile (2.7 km) tunnel under the city to replace a viaduct damaged in a 2001 earthquake.

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    According to the Washington State DOT, Seattle Tunnel Partners has temporarily stopped mining to prepare Bertha, the SR 99 tunneling machine, for the final 1,000 feet of the 9,270-foot tunnel drive.

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    Bertha, the world's largest tunnel-boring machine, ends its journey today. It has spent four years traveling less than two miles to build a new car tunnel underneath Seattle.

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