DESIGN-BUILD
Total Length: 1.6 miles (2.6 km) of double-track light rail.
Span length: 130 ft 6 in (39.8 m)
The South 200th Link Extension project expands the existing light rail system from Sea-Tac Airport to South 200th Street and 28th Avenue South.
The structural design involves the construction of 1.6 miles (2.6 km) of double-track light rail transit on an elevated guideway. The guideway is a precast segmental structure including twin track, and single-track box girders. Typical spans are simply supported with a maximum length of 130 ft 6 in (39.8 m). Continuous structures are used for longer spans up to 156 ft (47.5 m).
The project includes two long-span bridges with main spans of 333 ft (101.5 m) and 363 ft (110.6 m) in the area surrounding the Sea-Tac Airport. Typical spans are erected span-by-span with an overhead truss; long spans are erected in balanced cantilever with cranes on the ground or on deck.
