One team in England recently achieved one of the world's most sustained single tunnel-boring machine drives on a mine project, says its contractor, while another secured a design-build contract for the country's longest road tunnel,
Geography and time weren’t on the side of Mortenson when it needed to design and build a new siphon to move 22 million gallons of wastewater as part of an upgrade to a 42-year-old water system in Oregon.
The $2.1-billion Purple Line Extension Transit Project Section 1 in Los Angeles reached a major milestone recently, as two tunnel boring machines (TBMs) began carving out twin tunnels for the project.
