A New Roadway and Support Structure for a Major Artery Bridge
For the first time since it opened in 1961, the Throgs Neck Bridge, which carries more than 100,000 vehicle trips per day, will get a new roadway on the suspended span and new structural steel supports.
We are part of a joint venture developing a final design for the four-year project, which is scheduled to start construction in 2020.
In addition to the redecking design, we prepared load ratings to determine strengthening requirements for the floor and stiffening trusses, which included the option for a future seventh lane on the bridge.
Other improvements include replacement of existing finger joints with modular joints, a new steel median barrier and parapets, a new fire standpipe system, and new drainage, LED roadway lighting and signage.
Wind tunnel testing will also be performed for the proposed structure, which will include the impacts of staging and wind on trucks.
At the towers and anchorages, a cast-in-place concrete deck is being proposed.
Construction staging and maintenance and protection of traffic are critical to the project’s success. The recommended staging includes a five-lane scheme that provides three lanes during peak and two lanes in the non-peak direction, with the provision for a movable barrier.