PRIME performed annual routine and in-depth inspections of the Maryland Transportation Authority’s (MDTA) facilities in 2009-2010. PRIME completed inspections of the William Preston Lane Jr. Memorial Bridge (Chesapeake Bay Bridge – 4 miles); the Harry W. Nice Memorial Bridge (Nice Bridge – 1.7 miles); various bridges along I-95 NB & SB; various bridges along the I-395/I-95 Interchange into downtown Baltimore; and several approach bridges to the Francis Scott Key Memorial Bridge.
For the Chesapeake Bay Bridge, PRIME performed the in-depth inspection of the rolled beam approach spans B31 through B67 of the eastbound structure and concrete beam approach spans 1 through 19 of the westbound structure using an underbridge inspection vehicle and traffic control. PRIME inspected the substructure units within these spans to the waterline. In addition to the superstructure and substructure items noted above, PRIME also performed the in-depth inspection of the deck and parapets for the eastbound bridge consisting of the suspension spans to the eastern approach and the westbound structure of all portions west of the suspension span to the west approach.
For the Nice Bridge, PRIME performed the in-depth inspection of the rolled beam approach spans 1-60. Included with these inspections were all substructure units of the approach spans to the waterline. PRIME also inspected the 12 plate girder approach spans (six on the Maryland side and six on the Virginia side) using an underbridge inspection vehicle with traffic control and inspected the deck and parapets for the entire bridge.
PRIME inspected portions of the 10.9-mile-long Francis Scott Key Facility which carries portions of I-695 (the Baltimore Beltway). PRIME provided two inspection teams to perform in-depth inspection of 35 sign structures and seven bridges along the Facility using bucket trucks with traffic control. Types of bridge structures inspected by PRIME’s engineers included simple span steel girders, continuous steel girders, and simple span concrete T-beams. All of the bridges were founded on reinforced concrete substructures and were inspected to a level of detail in conformance with NBIS bridge safety inspection standards.
PRIME also performed in-depth inspections of several bridges on the Fort McHenry Tunnel Facility which carry portions of I-95 (northbound and southbound) as well as the I-395/I-95 Interchange into downtown Baltimore. Most of these bridge superstructures consisted of steel box beams which required confined space access in order to complete the inspections. The bridges ranged from 2-span to 14-span bridges and variously required such access equipment as underbridge inspection vehicles and man-lifts with reaches up to 80 feet.
On completion of the inspections, PRIME engineers completed the annual bridge inspection report for each structure which included an executive summary, overall NBIS rating and bridge elements sub-ratings, condition notes, photographs, updated SI&A data sheets, and prioritized repair recommendations.
- Bridge Inspection
- Sign Structure Inspection
- NBIS Ratings