Eglisau, ZH
Masonry · Railway infrastructure
Rheinbrücke Eglisau
Crack mapping and masonry segmentation
View projectRailway retaining walls
Terrestrial photogrammetric survey and crack mapping of two SBB retaining walls.
- Client
- SBB CFF FFS
- Location
- Liestal, BL
- Material
- Concrete
Concrete · Railway infrastructure
Terrestrial photogrammetric survey and crack mapping of two SBB retaining walls
Structure and inspection scope
Inspecting retaining walls beside an operating railway creates access constraints. For this project in Liestal, the image acquisition approach needed to work without a drone.
Inspection methodology
Approximately 13,000 images were captured at a resolution of 0.15–0.20 mm per pixel using an industrial-grade handheld camera. Our trained deep learning models were then used to segment and quantify cracks.
Inspection results
The survey was completed without interrupting rail traffic. The resulting crack pattern and estimated width supported detailed condition assessment.
SwissInspect / YouTube
Project video
See the inspection and its results on the SwissInspect channel.
Result examples
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