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Bridge Retrofit and Rehabilitation

As the nation's bridges age and deteriorate, repair and rehabilitation of these structures becomes more critical every year. New legislation allowing heavier trucks on our roads intensifies the problem. Often repairs must be done to extend the life of the bridge until it can be replaced. At MI Engineering we realize the importance of accurate and concise plans and contract documents, for large and small projects alike. Example projects highlighting recent staff experience are shown below.

Strengthening of Bridge #198 (Person County, NC)

When a new weight restriction was posted for Person County bridge #198, the local plant decided to pay for strengthening of the bridge, rather than re-route their supply trucks. After obtaining approval from NCDOT, the plant proceeded with the project.

MI Engineering staff working for Ko & Associates calculated the capacity required to eliminate the posting and designed steel cover plates to add the necessary strength to the rolled steel beams.

VDOT Bridge Rehabilitations (VA-Statewide)

Beginning in 2004 MI Engineering staff working for Ko & Associates had a chance to team with Whitman, Requardt, & Associates to develop rehabilitation plans for several bridges owned by VDOT. The projects included field assessments, repair recommendations, contract drawings, and engineering estimates.

The rehab for Route 621 over Nomini Creek in Westmoreland County required a field investigation, verification of the most recent structure inspection report, and calculation of load capacity ratings. This information was included in a Phase I design report along with several repair alternates and cost estimates.

The Carter Glass Bridge carries Rte. 29 over the James River, Concord Road, and CSXT and Norfolk Southern Railway lines in Amherst County. The project included development of plan sheets for steel bearing replacement, abutment backwall reconstruction, substructure surface repair, and waterproofing.

For the bridge carrying the westbound lanes of Rte. 360 over the Pamunkey River on the border between King William and Hanover Counties, MI Engineering staff working at Ko & Associates played a key role in the development of the rehabilitation plans from beginning to end. The project was comprised of a field evaluation, load rating analysis, and a Phase I design report, which included several repair alternates with associated cost estimates.

VDOT selected a preferred alternate and work continued with preliminary and final rehabilitation plans. The final repairs included milling and overlay of the deck, replacement or elimination of expansion joints, replacement of steel bearings with elastomeric, and various surface repairs to the concrete substructure.