The City of Fort Collins (Colorado) recently completed construction of a tunnel underneath BNSF Railway tracks to connect more than 30 miles of trails. The prospect of tunneling under an active rail line is a pretty big deal, and the railroad had strict requirements. The original concept of the tunnel was modified by the contractor and their engineer to utilize secant pile retaining walls to allow the construction of the portals closer to the rail line and decreasing the overall tunnel length. The tunnel was constructed by BT Construction and Lithos Engineering was their design engineer. Yenter construction was responsible for the retaining walls, including segments of sheet pile wall used to start things off. Anderson Drilling constructed the shafts for the secant pile wall and for the thrust wall. Read more about the project at TBM.
Controversy was swirling around last week’s Seattle Mayoral primary race as incumbent Mayor Greg Nickels supports the tunnel to replace the Alaskan Way Viaduct and challenger Michael McGinn wants to tear down the viaduct and […]
A federal judge in Seattle dismissed a lawsuit Friday aimed at stopping construction of a tunnel replacement for the Alaskan Way Viaduct. Judge John Coughenour said the people who brought the suit in September hadn’t […]
Hayward Baker has been working 18-hour days for Colorado DOT to repair a sinkhole on US 24 caused by an abandoned railroad tunnel. The link below takes you to a photo gallery on Hayward Baker’s […]