October 04-07, 2021
NAEC 2021
New Orleans, LA
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Nuttall Gear Custom Heavy-Duty Gearboxes for Swing Bridges
The Lindsey Warren bridge that spans 3 miles across the Alligator River in
North Carolina recently underwent a major renovation. Originally built in 1962,
the two-lane bridge carries U.S. 64 vehicular traffic between Tyrrell and Dare
counties. The North Carolina Dept. of Transportation approved the renovation
project that included the mechanical and electrical components positioned
below the bridge’s center swing span that allows marine traffic to pass through
the bridge.
Nuttall Gear designed and manufactured two new enclosed gearboxes for the
bridge. Both units featured fabricated steel housings and were load tested to
150%. All welds were inspected by an Independent Certified Weld Inspector (CWI).
Special center distances were required.
- Primary Parallel Shaft Differential Reducer:
Input rating: 25 HP @ 870 RPM, Reduction ratio: 30.41:1
- Wedge Machinery Parallel Shaft Reducer:
Input rating: 7.5 HP @ 870 RPM, Reduction ratio: 28:1
Highlights
- Custom-designed enclosed
reducers
- Special center distances
- Fabricated steel housings
- Load tested to 150%