Permanent Jacking and Lengthening of Twin Steel Box Girder Bridge

摘要

To accommodate the I-595 Express Toll Lanes (ETL) atthe University Drive interchange, the owner’s conceptproposed replacing two curved steel box girder rampbridges. The redesign of the southbound ramp includedreconfiguring the geometry of the bridge by: removingand reconstructing the last span and a portion of thepenultimate span using a spiral alignment, and raisingthe ramp 18 inches to meet the vertical clearancerequirements. Subsequently, the northbound ramp didnot require modification.