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direction. The contractor then gets to work in two separate work zones on demolition of the old deck, using saws and jack hammers. Deck demolition is followed by extensive steel work, includ- ing deteriorated rivet removal (which are replaced with bolts), new diaphragm con- nections, floor beam repairs if required, and miscellaneous repairs. Deck panels are placed beginning mid to late morning on Saturday, while rivet removal and other structural work continues.

By late on Saturday, the mobile mixer is brought out on the bridge, and closure pours are made using a rapid setting concrete, which develops sufficient strength to open to traffic in approxi- mately an hour and a half. By Sunday morning, the structure is reopened to

Traffic is stopped momentarily when deck

panels are swung over open lanes of traffic.

  • DOT determined that it would be more cost effective to fully replace the deck in some areas rather than continuing to put patches on top of patches. Highly detailed plans were developed by Consultant Charles H. Sells, Inc., for this complex project.

Work on the Gowanus project began again this spring, and is scheduled to be completed in August. Deck replacement on 20 spans, a total of 40,000 s.f., is tak- ing place during weekend closures, with four lanes of traffic sharing the median area and the three lanes on the opposite side of the structure. Precast Exodermic deck panels are being used, typically 38 feet x 8 feet in size. Faddis Concrete Products is supplying the precast

Exodermic panels, with the grid portion of the panels supplied by American Bridge Manufacturing (for Greulich Bridge Products).

Before this full deck replacement project began, the raised median was modified in order to accommodate a lane of traffic. This permits four of the six lanes of traffic to be maintained while the deck replacement is in progress.

Work begins at 11 PM on Fridays, with about two hours required to shift traffic from the north bound side to the left hand lane of the southbound side and the former median. “Cattle chutes” direct traffic from three to two lanes in each

By evening on Saturday, all deck panels are in place and ready for the placement of rapid-setting concrete

traffic, though should extensive floor beam repairs be required, or if some- thing should go wrong, the contractor has until 5 AM on Monday morning to complete his work and restore the struc- ture to its 6 traffic lane configuration.

In the final configuration, the median becomes an HOV lane that runs in the main direction of rush hour traffic, with a movable barrier used to make the switch twice per day.

The next contract for Exodermic deck replacement on this structure (also designed by Charles H. Sells, Inc.) will be let in June. Twenty one spans will be redecked under that contract.

Leveling devices, shop attached to the grid by fabricator American Bridge Manufacturing, allow rapid adjustment of haunch heights.

EXODERMIC BRIDGE DECK, INC. • 60 LONG POND RD, LAKEVILLE, CT 06039 • TEL: 860.435.0300 • FAX: 860.435.4868 • info@exodermic.com


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