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OTIA III State Bridge Delivery Program
Web Brief (Aug 06)
Re-used beams
Concrete Box Beams Reused on Detour Bridges Saves $500,000
When ODOT must replace a bridge on an interstate highway, the agency often requires that contractors install a temporary detour bridge to keep traffic moving. On one OTIA III State Bridge Delivery Program project, CH2M HILL Constructors built such a detour bridge in the course of replacing the Coast Fork Willamette River bridges, part of the Interstate 5 Clarks Branch to Tunnel Mill Race bundle.
When the new bridges were recently completed, the 88 prestressed concrete box beams that made up the detour bridge were no longer needed. Along with its subcontractors, CH2M HILL Constructors designed three other detour structures in ways that permitted reusing the beams. Forty-eight beams were used for the Gettings Creek Bridge detour, 24 were used for the Roberts Creek Bridge detour, and eight will be used for the Tunnel Mill Race Bridge detour. The beams were lifted off the foundations, loaded onto trucks and shipped to their new locations. Eight are still available for reuse on other projects.
Because each beam is worth approximately $6,300, reusing 80 of them reduced the cost of the contractor’s bid by half a million dollars.
“We’re always on the lookout for ways to design a project so that we can get more than one use out of a temporary structure,” said John Dudasch, regional operations manager for CH2M HILL Constructors. “Recycling is a good ultimate destination for things that no longer serve a purpose, but reusing construction materials is even more cost-effective and environmentally friendly.”