B&N has provided bridge engineering and inspection services to the Arizona Department of Transportation (ADOT) since 1988. Task orders have included NBIS NSTM, in-depth and routine bridge inspections of 1400+ bridges on multiple cycles, including the Virgin River Gorge I-15, Burro Creek, Ocean-to-Ocean Highway, Glen Canyon and Navajo bridges. Element-level data and defects are collected and reported in AASHTOWare BrM software. Additional assignments have included every initial NTIS Tunnel inspection in the state; measuring bridges for load rating; and instrumentation, load testing and long-term Structural Health Monitoring of multiple fracture critical bridges.
Other significant aspects of these projects include:
- 302 canal bridge inspections which required significant coordination with 22 Irrigation Districts and Canal Authorities.
- Many assignments require additional railroad coordination to gain arm’s length access to NSTM components and/or fatigue prone details.
- Adapted rock climbing techniques supplemented by mechanical access equipment are regularly utilized to efficiently inspect structures while minimizing impacts on the traveling public.
- Non-destructive testing techniques to confirm/assess suspect crack locations, accurately determine section loss, and/or to perform material sampling.
- Routine inspections include observations and measurements to thoroughly assess the current condition of primary components and careful documentation of deficiencies.
- Repair and Maintenance Recommendations are included in each report in accordance with ADOT’s preferences.
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