Malmsbury River and Bakers Creek Heritage Viaduct Inspections
Sterling combined UAV photogrammetry and touching-distance inspection to assess two heritage masonry arch viaducts during normal rail operations, producing visual, measured and three-dimensional condition records without disrupting services.
Challenge
The heritage masonry arch viaducts at Malmsbury River and Bakers Creek required detailed structural condition assessments within an operational regional rail corridor. The inspection approach needed to provide broad visual coverage and close-up verification of structural elements without disrupting normal rail services, while creating reliable records to support ongoing heritage asset management.
Solution
Sterling used UAVs to capture high-resolution imagery of accessible arch soffits, spandrel walls, piers, abutments and parapets. Photogrammetric processing converted the imagery into 3D models, providing a measurable visual record and supporting desktop interpretation. Sterling then completed touching-distance inspections (TTDI) from an elevated work platform to directly assess structural elements and supplement the UAV findings. Both inspection methods were undertaken during normal operating hours.
Deliverables
Deliverables included structural inspection reports and condition ratings for both viaducts, spatially referenced 3D photogrammetric models, touching-distance inspection records, and photographed schedules of maintenance items and prioritised repair recommendations.
Outcome
The combined UAV and touching-distance approach provided broad three-dimensional visual coverage together with direct close-up assessment. Both inspections were completed during normal operating hours without disruption to rail services. The resulting records established a condition baseline to support maintenance planning, targeted repairs and future comparison of the heritage assets.
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