SR 520 Floating Bridge, WashingtonOverview
The Governor Albert D. Rosellini Bridge-Evergreen Point (commonly called the SR 520 Bridge) is the longest floating bridge on Earth at 2,310 meters (7,580 ft) and carries State Route 520 across Lake Washington from Seattle to Medina. The bridge’s total length including approaches is approximately 4,750 meters (15,580 ft). The bridge was opened for traffic in 1963, after three years of construction, as a four-lane toll bridge. Due to its age and deteriorated condition, construction is currently underway to replace it with a new floating bridge.
mageba is supplying 9 modular expansion joints for the new bridge. The largest of these have 16 gaps and allow 1,230 mm of longitudinal service movements, or 1,790 mm of extreme limit state (ELS) movements. Smaller modular joints, with 2 and 6 gaps, and single gap joints, are also required.
The selection of TENSA®MODULAR joints ensures that the significant transverse movements, and rotations about any axis, that can be expected in any floating bridge, will be well accommodated.
TENSA®MODULAR joints, Types LR16, LR6, LR2; TENSA®GRIP, Type RS-B5
Floating pontoon bridge
2,310 m (floating)