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seattle’s tunnel boring machine bertha

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World's biggest tunnel machine Bertha emerges from - Autoblog

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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Prediction of roadheader performance by artificial neural

Performance prediction is one of the major parameters for the success of roadheader applications and generally deals with machine selection, production rate, and bit consumption. Instantaneous cutting rate (ICR) is defined as the production rate during a

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Bertha Finally Breaks Through In Seattle : The Two-Way : NPR

Bertha Finally Breaks Through In Seattle : The Two-Way After a two-year delay for repairs, the giant tunnel-boring machine has completed its mission far beneath the city's streets.

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A new model to predict roadheader performance using rock

Prediction of roadheader performance plays a significant role in the plan of tunnel construction, which is influenced by different key parameters, including rock strength, discontinuity in rock mass, type and specifications of roadheader machine, and brit

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

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 ...

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Inside the Massive Tunnel Seattle Built to Replace an

Seattle's waterfront is getting a makeover. It hasn't been a particularly rapid affair (certainly nothing for Elon Musk to measure himself against), but the workers building a tunnel to replace a section of elevated roadway, and reopen up the city to the

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Bertha | The Seattle Times

Read more about the technical challenges and rising costs of the Highway 99 tunnel project, and the successes and travails of Bertha, the biggest-ever boring machine.

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Follow Bertha's breakthrough - The WSDOT Blog

The tunneling machine Bertha will mine ... Below is footage of Bertha's breakthrough, ... http://www.king5.com/news/local/seattle-tunnel-boring-machine-bertha ...

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Watch Bertha, the world’s largest tunnel boring machine

From the dark depths beneath Seattle, Bertha the SR 99 tunnel machine headed out of the muck and into daylight on ... the world’s largest tunnel boring machine, ...

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Hemisphere | Definition of Hemisphere by Merriam-Webster

Hemisphere includes the prefix hemi-, meaning "half". The northern and southern hemispheres are divided by the equator, the circle halfway between Earth's two poles. The eastern and western hemispheres aren't divided so exactly, since there are no poles i

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Big Bertha: Mystery object blocks Seattle's tunnel drill

The world's biggest tunnel boring machine, named after Seattle's first female mayor, has been brought to a halt ... Big Bertha: Mystery object blocks Seattle's tunnel drill. ... The $80 million ...

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Big Bertha – world’s largest tunnel boring machine

Named after one of Seattle’s early mayors, the $80 million drill Big Bertha is 326 feet long, weighs 6,700 tons, and does much more than drill. John Blackstone reports on what the high-tech ...

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Seattle’s Tunnel Boring Machine Bertha - Video Results

More Seattle’s Tunnel Boring Machine Bertha videos

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The Brilliant Vigilance of Seattle's Huge New SR-99 Tunnel

How do you keep a tunnel safe? Hundreds of cameras, 17 jet fans, and a sprinkler system that can out-hose Splash Mountain.

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ROADHEADER PERFORMANCE PREDICTION - bamfordrocks.com.au

Correlations of observed roadheader performance with each author’s combination of laboratory measurements, with or without rock mass characteristics, have led to some success in “ball-park” predictions of future field performance.

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Save time, stay dry on foot in Seattle’s ‘hidden

Eric Makus uses this tunnel to walk underground from the King County Administration Building on Fourth and James to the Goat Hill Parking structure on Sixth and Jefferson.

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Bring Back the Thor Automagic, the 1940s Hybrid

The Large Hadron Collider, a particle accelerator located at CERN outside of Geneva, Switzerland, is the largest machine in the world: It has a circumference of almost 17 miles and took around a decade to build.

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

The owner of the tunnel-boring machine is Seattle Tunnel Partners, the contractor chose by WSDOT for the tunnel project. Bertha even has her own Twitter account and it’s quite entertaining. Nice ...

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The World's Largest Tunnel-Boring Machine Must Be Saved

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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Alaskan Way Viaduct - Tunneling

The tunneling machine known as Bertha began tunneling ... the machine's cutterhead being lowered into the launch pit near Seattle's stadiums). The machine ...

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