THE CONCRETE BRIDGE MAGAZINE

WINTER 2017

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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PROJECT Bridge 85851 Minnesota opens new bridge ahead of schedule and using construction manager/general contractor procurement methodology for the first time by Terry Ward and Keith Molnau, Minnesota Department of Transportation On August 27, 2016, the Minnesota Department of Transportation (MnDOT) and its project partners opened the new Bridge 85851 with a community celebration that was attended by over 700 people. The bridge was built in only 2 years and opened ahead of schedule, with a cost below the original budget. This project performance required the use of a new procurement methodology, a strong team of engineers and project managers, a high-quality contractor, and a bit of luck. Project History Existing Bridge 5900, which spans the Mississippi River in Winona, Minn., was opened to traffic in 1942 and has provided an important regional crossing of the river. It has 24 spans, consisting of a through-truss, deck-trusses, steel beams, and concrete T-girders, and was redecked in 1985. It is fracture-critical and scour-critical and was closed for 2 weeks in 2008 for gusset plate repairs. Recent inspections had shown an acceleration in the rate of deterioration and the bridge was in need of repair. Federal laws provide for the protection of historic bridges, and existing Bridge 5900 was eligible to be listed on the National Registry of Historic Places (NRHP). After several years of study of various alternatives that would comply with a no adverse effect finding and continued NRHP eligibility, planning efforts settled on an alternative that included rehabilitation of the cantilever through-truss (the main three spans), along with replacement of the approach spans. This alternate also included construction of a new girder type bridge on a parallel alignment. The total project cost estimate was $189 million. Project Goals Based on extensive outreach with our project partners, the overriding goals for the Bridge 85851 project became • build the new bridge as quickly as possible, • keep the river crossing open during construction, and • preserve the historical importance of existing Bridge 5900 with both a no adverse effect and continued NRHP eligibility. PROFILE BRIDGE 85851 / WINONA, MINNESOTA BRIDGE DESIGN ENGINEER: FIGG Bridge Engineers, Denver, Colo., and Tallahassee, Fla. DESIGN PEER REVIEW: Parsons Transportation Group, Minneapolis, Minn. CONSTRUCTION MANAGER / GENERAL CONTRACTOR: AMES Construction, Burnsville, Minn. INDEPENDENT COST ESTIMATE: Armeni Consulting Services, Suwanee, Ga. PRECASTER: Cretex Concrete Products, Elk River, Minn.—a PCI-certified producer POST-TENSIONING CONTRACTOR: Schwager Davis Inc., San Jose, Calif. CONSTRUCTION INSPECTION: MnDOT District 6 Construction Unit, Rochester, Minn.; HDR Engineers, Minneapolis, Minn.; Stantec Engineers, St. Paul, Minn.; Mead & Hunt, LaCrosse, Wis.; and FIGG Bridge Inspection, Tallahassee, Fla. (Segmental)

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