PCL : Ben Sawyer Swing Bridge Design-Build
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Ben Sawyer Swing Bridge Design-Build

Project Overview

This two-lane structure connects the town of Mt. Pleasant to Sullivan’s Island, and traverses the Atlantic Intracoastal Waterway with 900 feet of fixed concrete approach spans and a 247-foot center swing span. This project entailed superstructure replacement, swing span replacement, substructure modifications, a complete mechanical and electrical overhaul, operator house replacement, approach slab modification and widening, and fender system replacement.

To minimize effects on motorists and the marine-traveling public, PCL completed all superstructure and swing span replacement work during a single 10-day bridge closure using accelerated bridge construction (ABC). To make superstructure and swing span replacement a success, the team constructed the new concrete approach spans on a temporary platform that was installed directly adjacent to the existing bridge. During the closure, all existing approach spans were rolled out of position, while the new approach spans were simultaneously rolled into position using hydraulic jacks and heavy-duty rollers.

This bridge is surrounded by environmentally sensitive marshlands, and it was very important to the client that these areas be protected during construction. PCL met this challenge by constructing all work from the top down, from a temporary work trestle that minimized construction impacts.

DETAILS

CLIENT:
South Carolina Department of Transportation
PROJECT LOCATION:
Charleston, SC
PCL OFFICE:
Raleigh – Civil Construction (Transportation Infrastructure)
COMPANY:
PCL Civil Constructors, Inc.
SECTOR:
Civil
MARKET:
Bridges
DELIVERY METHOD:
Design-Build

Awards

Platinum Award for Engineering Excellence - American Council Engineering Companies

National Design-Build Award (Transportation under $50M) - Design Build Institute of America

Perfect Safety Award - National Safety Council