Bridge 92297 was a single-span reinforced concrete flat slab bridge designed by C.A.P. Turner, a nationally prominent engineer based in Minneapolis. PVN was retained as a sub-consultant to assist with the documentation of the Minnesota Department of Transportation’s (MnDOT) Bridge 92297 for the Minnesota Historic Properties Record (MHPR) prior to its demolition.
For this project, PVN provided expertise in the assessment and documentation of the bridge’s structural design. The scope of work included an evaluation the condition of the bridge prior to demolition, an assessment of its construction methods and materials, and documentation of the configuration of the bridge’s reinforcement which was achieved by meticulous selective demolition of the concrete, and a comparative analysis between the design of the bridge shown in original drawings with the bridge as constructed. Deliverables included a written report of our observations and analysis, as well as measured drawings of the steel reinforcement used in the bridge.
When demolition of a resource is unavoidable, documentation can partially mitigate this loss by recording and allowing for the future study of the resource’s features. PVN is uniquely positioned to bring added value to documentation projects, as our interdisciplinary staff combines historical consultants and researchers, historical architects, and expertise in city planning, structural engineering, and construction history.
Photo credit: Dan Pratt, ARCH3, LLC