Tag: Big Bertha pipe.pipe that stopped Big Bertha

Construction Equipment

Tunnel-boring machine Big Bertha moves forward 2 feet in test run to see if blockage is fully removed

After nearly two months of downtime caused by a steel pipe stuck in her teeth, Big Bertha, the world’s largest tunnel-boring machine, briefly went back to work beneath Seattle. According to a report from the Associated Press, the Washington State Transportation Department announced that Bertha moved two feet on Tuesday which was just enough progress […]

January 30, 2014