Jan 12, 2014 · Originally published on December 12, 2013 The world's largest tunnel boring machine bumped into a mystery object under downtown Seattle last Friday, bringing...
Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57.5 feet (17.5 m) across.
The world's largest tunnel drill spent Tuesday ... Bertha's breakthrough just 'halftime' for tunnel ... A look back at the saga of Seattle's giant tunnel machine;
Dec 24, 2013 · 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 Blacksto...
The world's largest tunnel-boring machine which is building a multi-billion dollar underground highway beneath Seattle has finally completed its missions - three years later than planned.
Using the word early to describe the opening of the Alaskan Way Viaduct Replacement Tunnel isn't fully accurate. The project was originally slated to open in December 2015, but faced years of delays when the tunnel-boring machine malfunctioned beneath downtown Seattle pushing the revised timetable to the first half of 2019.
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.
Apr 03, 2017 · Workers make preparations to lift the cutting head from Bertha, the world's largest tunnel-boring machine, and lift it out for repairs in Seattle, Washington March 9, 2015.
Contractors building a highway tunnel under Seattle are preparing to remove the world's largest boring machine so that it can be repaired. The gigantic drill, known as Bertha, stopped working in December 2013 after digging just 1,000ft of its two-mile journey to replace the aging Alaska Way, which was damaged in 2001 by an earthquake.
Bertha, the world's largest tunneling machine, has been stuck under downtown Seattle since it broke in December 2013. Engineers have had to concoct a massive and expensive rescue plan—essentially a whole construction project in itself.
Big Bertha, world's largest tunnel-boring machine, arrives in Seattle . Wayne Grayson ... Big Bertha is the world's largest tunnel-boring machine.
More than 150 feet below the streets of Seattle, Bertha presses on, boring a 57.5-foot diameter tunnel underneath the city. The largest tunnel boring machine (TBM) in the world when it was built, Bertha weighs a gargantuan 6,700 tons and stretches 326 feet long.
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.
The SR 99 Alaskan Way Viaduct, an elevated concrete structure built in the 1950s and vulnerable to earthquakes, is being replaced with a 1.7-mile tunnel running beneath downtown Seattle.
A tunnel boring machine ... It was delivered to Seattle, Washington, ... 2.M-30 EPB Tunnel Boring Machine - the largest built in the world;
Apr 03, 2017 · Bertha has broken through. After nearly four years underground, Seattle's beleaguered boring behemoth clawed its way into daylight yesterday, leaving a 1.7-mile tunnel behind it.
The SR 99 tunneling machine, nicknamed Bertha, ... this page tracked her progress beneath Seattle. With the machine dismantled and removed, we are now tracking tunnel ...
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 machinery can do, as well as its latest challenge digging in the depths of Seattle.
Apr 03, 2017 · Bertha, the machine digging a 1.75 mile tunnel under Seattle to replace a waterfront bridge with an underground roadway, had just 30 feet of mining left at the beginning of the day Tuesday.
World's Largest Tunnel Boring Machine Move. One of Barnhart's largest lifts ever took place in Seattle and involved the world's largest tunnel-boring machine.
Thursday, 22 June 2017 12:00 The largest tunnel boring machine (TBM) in the world finished drilling underneath Seattle Written by TheStructuralEngineer.info
Apr 03, 2017 · Seattle's tunnel-drilling machine, Bertha, the world's largest tunnel-boring machine starts breaking through the concrete wall in Seattle, Washington, U.S., April 4, 2017.
Bertha's end could be near. The world's largest tunnel-boring machine is on schedule to break into daylight this spring after a tumultuous dig under downtown Seattle that's years behind schedule.
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.