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2014SumShotcreteEMag

On December 3, 2013, Coastal Gunite’s crew piles that were severely scoured, the bridge was working on the bridge substructure when reopened to traffic on December 15, 2013. NCDOT determined that the bridge deck had dropped an unsafe level—scour had caused a set Replacement on the Horizon? of piles to settle. The bridge was immediately NCDOT first began the process of investing in closed to traffic and the shotcrete crew was a new bridge in 1989. Over the course of over two forced to evacuate the project. NCDOT instituted decades, NCDOT has completed many detailed its emergency protocol and implemented ferry studies analyzing options for replacing the bridge. service for vehicle access to the island. After an While several permits have been obtained to aggressive dredging effort that placed approxi- proceed with a replacement, lawsuits continue to mately 30,000 yd3 (22,937 m3) of sand around plague the process. If all legal and administrative hurdles were Major Repairs Since 1990* cleared today, according to Pablo Hernandez, Year Description Resident Engineer for NCDOT, it would take at 1991 Replaced spans least 4 years for a replacement to be in place. Therefore, continued evaluation and maintenance 1992 Scour protection of the structure is required. 1994 Riprap “You never know,” says White, “with required 2005 Scour repair bridge inspections and safety concerns, we may 2006 Repair concrete girders come back yet again to repair more concrete before a replacement is built.” 2009 Repair fender system 2008 Add concrete subcaps and pile jackets 2008 Martin Emmrich is a ProjectConcrete rehabilitation and repair (shotcrete) Manager for Coastal Gunite 2011 Steel repair on channel spans Construction Company. Based 2011 Scour protection in Bradenton, FL, he has over- Install crutch bent and scour seen dozens of concrete reha- 2012 bilitation projects includingprotection shotcrete services from New 2013 York to Florida. Among others,Concrete rehabilitation and repair (shotcrete) he is currently managing projects for the Florida 2014 Steel crutch bent repairs Department of Transportation featuring shot- *Repair projects in excess of $500,000. crete repair coupled with cathodic protection. Source: North Carolina Department of Transportation Shotcrete • Summer 2014 23


2014SumShotcreteEMag
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