The Minnesota Department of Transportation (MnDOT) is utilizing drones to collect and process large amounts of data during bridge inspections with the goal of improving the quality of bridge inspections and improving safety for both inspectors and the traveling public.
Data was collected primarily from an imaging payload intergraded into the UAS body. Case study inspection reports were compiled for a select number of bridges representative of various use cases.
- Drones can reduce the safety risks of bridge inspectors by removing or reducing the need for traditional access methods such as Under Bridge Inspection Vehicles (UBIVs), rope access, ladders and scaffolding. Additionally, drones can reduce the risks posed to both the public and bridge inspectors by eliminating the need for traffic control and the need for inspection personnel to work near traffic.
- The cost savings from removing traditional bridge access methods were significant – ranging from $540 to $21,000, with an overall average cost savings of 40 percent. Even where there were no cost savings exhibited, the quality of the deliverables was greatly improved. Though difficult to quantify, additional cost savings were expected from the improved inspection information drones provide, allowing bridge owners to make better risk-based investment decisions on bridge repair, replacement and maintenance needs.