The Beacon Hill tunnel is a twin tunnel located east of I-5 in Seattle. One tunnel carries northbound trains and the other carries the southbound trains. It is approximately one mile long and includes a 165 foot deep station accessed by an elevator at street level. The precast segments were cast in eight sets of highly accurate, machined steel molds manufactured by CBE. Each set forms the shapes for the seven segments that make up one ring. Each ring is 18’-10” I.D., 20’-6” O.D. and 5 feet long. The molds were cycled once per day and cured in enclosed tents overnight with steam heat.
Precast Tunnel Liner Segments - 12,400 pieces