A&O provided a National Bridge Inspection Standards (NBIS) Inspection for this 5.2 mile, 268-span bridge which crosses the Croatan Sound from Manns Harbor to Roanoke Island. The superstructure consists of seven lines of prestressed precast concrete girders supporting a lightweight reinforced concrete deck on cast-in-place reinforced concrete substructure with integral bent diaphragms.  The 504’-9” main spans consists of seven triple-span continuous prestressed concrete girders spliced together with post-tensioning.

The access for inspection required the use of two under-bridge platform trucks deploying off both sides of the bridge and two separate traffic control patterns.  The inspection teams worked in unison to inspect the bridge and collect the data electronically.  At the end of each day, we collected, combined, and sorted the data.  The following day, we entered the data into NCDOT’s reporting software, Wigins.  After the data had been entered, we exported a PDF of the report and performed quality control for that day’s work.   By seamlessly combining the field work with data entry and quality control, we completed the inspection efficiently, with a high degree of accuracy and consistency.

Non-destructive testing of concrete bridge decks (using swiss hammers, and chloride sampling) was completed to determine the condition of the bridge deck and the chloride content in the concrete and set a baseline. Ω

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