Wells Street Bridge
|Contact Person||Thomas Powers, P.E.;|
Chicago Department of Transportation,
This bridge with 3 spans (111-ft. center span) is a steel through truss in the city center.
Part of a large project to rebuild Chicago's Wacker Drive involved rebuilding an 1899 steel bridge for the Chicago Transit Authority's elevated trains. The original specification required rebuilding the bridge in section on weekends in one month; however, the bridge owner approved the contractor's value-engineering proposal to pre-build the bridge and then moved it into position over a single weekend. The center span was constructed near the site and moved on a special hydraulic carrier about 75 ft. west and 5 ft. north, where it was placed on new foundations and connected to two shorter spans on either side. In spite of stiff contractual penalties for any delay ($1,000/minute), work was completed over a weekend in May 2002 with 2 hours to spare.
The 425-ton, 111 ft. long and 25 ft. high center-span superstructure was prefabricated.
|Other Keywords||total superstructure prefabrication|
|Advantages||Minimized traffic disruption|
|Photo Credits||Chicago Department of Transportation|