Queens & Bronx, NY
Opened as a four-lane suspension bridge in 1939, the 72-year-old structure, which had been increased to six lanes over the years, needed further capacity improvements as well as modernization.
Conti reconstructed the Bronx approach for this major historic continuous span steel bridge, which included widening the bridge deck, adding two lanes to the approach, demolishing and replacing the old piers and upgrading the lower garage service building. Utilizing careful orchestration and skilled project management, Conti’s first step was to construct new piers and install multi-rotational bearings which were critical schedule items for the new steel installation. This drove concrete pours and ultimately the phased traffic shifts. The team constructed extensive temporary shoring to support the existing piers so sections could be demolished in stages.
Implementing complex phasing to minimize impact on the heavy traffic flow, the team constructed new piers in advance of deck demolition under the existing structure, requiring low headroom equipment to install mini-piles for pier construction. These difficult drilling conditions for the mini-piles restricted the use of traditional equipment, so Conti deployed a highly innovative percussive down-hole hammer along with grouting through the hammer bit to successfully install the mini-piles.
The team used a movable barrier system so three lanes of traffic remained opened in the peak direction during rush hour, and all lane closures successfully met the 319-day restriction window.
|Client||Triborough Bridge and Tunnel Authority|
SCDOT needed a new interchange along I-26 to provide direct access to the newly-built Volvo Manufacturing Facility providing 2,000 jobs to local workers.
One of the busiest and most congested interchanges in New Jersey, the intersection of I-295, I-76 and Route 42 in Camden County handles daily traffic volumes of over 250,000 vehicles and has one of the highest accident rates in the state.