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The Governor Albert D. Rosellini Bridge-Evergreen Point (commonly called the SR 520 Bridge) carries State Route 520 across Lake Washington from Seattle to Medina. The SR 520 Bridge Replacement development has reached its latest construction phase with the West Approach Bridge North Project. Expected to be completed in the summer of 2017, the new West Approach Bridge North will carry westbound cars, buses and trucks from the new floating bridge to the Montlake area.
The pre-stress girder structure will feature wider lane, shoulders and have a 14-foot-wide bicycle/pedestrian shared path on the north side of the bridge. mageba supplied seven TENSA-MODULAR (type LR) expansion joints for the new West Approach Bridge North. The joints range from 6 to 8 gaps that allows up to 25 in (640 mm) longitudinal service movement. The joints are equipped with noise-reducing “sinus plates”, which provide a smooth driving surface for vehicles, minimizing vibration and noise by up to 80 %. Another feature is the ROBO-MUTE blanket panels, a system of mat layered membrane that reduces noise transmitted from beneath the joint.
Modular expansion joints ready for transportation from the production hall in Pottstown (PA) to the site
3D view of the installed modular expansion joint featuring sinus plates and noise protection mats beneath the joint.
TENSA-MODULAR joints, types LR-LS6, LR-LS7, LR-LS8; ROBO-MUTE sliding panels
Noise-reducing “sinus plates” on surface, ROBO-MUTE Sliding Panels