Drilling complete – digging underway at U District
Construction at U District Station has shifted from drilling to digging. Crews began drilling 230 piles around the perimeter last April. The 40 to 120 foot-deep piles were reinforced with support beams, concrete, and rebar.
Now that the piles are in, crews are excavating the station box. As crews dig down, wood lagging will be installed between piles to form shoring walls. Shoring walls will form the sides of the station box. Excavation for U District Station will reach as deep as 95 feet. Excavation will continue through spring 2015.