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Fig. 10: Smoothed finish after hand nozzling Fig. 12: Northbound view of the entire tunnel as seen from the south portal Fig. 9: Southbound view of tunnel after initial robotic placement of shotcrete for support Fig. 11: Steel beam and lagging support in conjunction with lower shotcrete support solutions were employed. One of the issues was smoothing various areas of the extensive tunnel for waterproofing. This was accomplished by hand nozzling the shotcrete in lieu of the robotic unit, as it provided better control of the surface. The purpose of the Louisville-Southern Indiana Ohio River Bridges Project is to increase cross-river mobility by improving safety, alleviating traffic congestion, and connecting highways. The project will stimulate the economy of the entire Louisville-Southern Indiana region. According to the Federal Highway Administration’s Record of Decision, to meet these needs, two crossings are necessary—one in the downtown area and one 8 miles upstream in the metro area’s growing East End. The East End Crossing will provide several very specific benefits to the Louisville and Southern Indiana area, including convenient access for area residents commuting between eastern Jefferson County and southern Indiana. And for travelers passing through the Louisville area from the north or south, the East End Crossing is an alternate (and very accessible) route that bypasses the urban traffic of downtown Louisville. The project also keeps the Drumanard Estate intact and preserves a major piece of history for the region. Marcus H. von der Hofen, Vice President of Coastal Gunite Construction, has nearly two decades of experience in the shotcrete industry as both a Project and Area Manager. He is an active member of American Concrete Institute (ACI) Committees 506, Shotcreting, and C660, Shotcrete Nozzleman Certification. He is a charter member of ASA, joining in 1998, and currently serves as Past President to the ASA Executive Committee. 16 Shotcrete • Spring 2016


2016SpringShotcreteEMag
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