The superstructures of the bridges are to be manufactured as single-span steel trough bridges with two main longitudinal members and
orthotropic deck plate.
In practice, this leads to numerous weld repairs and rigorous inspection requirements that drive up the cost of
orthotropic deck fabrication.
The old structure was demolished to make way for a 213 metre-long
orthotropic deck bridge with four spans.
Since the floating deck is more rigid than a steel
orthotropic deck, and the bonding between the asphalt overlay and concrete fill is more secure, the overlay is less susceptible to cracking and debonding, resulting in a longer service life.
As part of the project, Tom Riester, chief structural engineer, needed to replace the bridge's aluminum flooring system and aluminum
orthotropic deck, which were installed in 1933.
Work is expected to be completed in four main stages and includes the installation of new finger joints, a bridge barrier, bridge drainage system,
orthotropic deck waterproofing, Rosphalt asphalt overlay, new sign structures, and upper and lower deck roadway lighting.
7 million Verrazano-Narrows Bridge upper level deck replacement project, which is replacing the original 1960s-era roadway with a lighter-weight, longer-lasting steel
orthotropic deck.
Engineers define an
orthotropic deck as one that consists of steel plates supported by ribs underneath, overlain by an integrated wearing (driving) surface.
Parsons Throgs Neck Bridge
Orthotropic Deck Repair project won an ACEC NY Gold Award in the structural systems category, and the firms Route 35 Emergency Restoration work won the Honor Award-Large Project from ACEC NJ.
Both superstructures consist of a 2-stegigen steel truss with
orthotropic deck.
has developed a new
orthotropic deck system that has great potential as a retrofit option for aging bridges.
Production of deep foundations with large-diameter piles, a movable (bascule bridge) and 2 fixed superstructures of
orthotropic deck including engineering and drive technology, electrical engineering and control, corrosion protection, land-based weaponry soundings and all on / manufacturer-side services in accordance with Machinery Directive to commissioning.
