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Construction Layout
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Stationary LiDAR
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Benchmark Recovery
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Point Cloud Extraction
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Ongoing
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Overview
To assist with a rehabilitation effort on NYS Routes 19 and 98 in the town of Albion and Brockport, GdB Geospatial was hired to complete a laser scan of the existing steel bridges and deliver a point cloud for use in steel manufacturing and fabrication.
GdB began with a full review of the provided contract plans and design CAD files. On site, GdB field crews recovered and verified the existing contract survey control and benchmarks. Additional survey control and benchmarks were established for layout and monitoring use throughout the project timeline. Utilizing stationary LiDAR, GdB field crews laser scanned the critical bridge apparatus including existing abutments, bridge camber, concrete walls, concrete pits, lifting machinery frames, and the upper and lower chords. The resulting 3D Point Cloud of the scanned data, and a scan report, was generated to show residuals and overall cloud accuracy. Critical points were identified and located using a total station, these points were marked for identification and will be monitored throughout the course of construction.
Post-demolition of the Erie Canal Lift Bridge, GdB completed an additional laser scan for use for use in verify fit and placement of design components. C A Point Cloud was prepared with the scanned data, alongside an accuracy report and comparison information for the contractor.
GdB Value
For the Fabrication phase of this project, GdB scanned roughly 25 lifting components in the contractor’s warehouse, per bridge. Critical points that were identified during the initial scan were used as reference points in point cloud extraction and comparisons. An accuracy report of the scanned data was provided to the contractor, alongside the processed point cloud in the contractor’s preferred format for use in their fabrication software. This enables the manufacturer to fabricate the parts and assemble in house ensuring proper fit prior to installation onsite.
Conventional survey methods were used to provide layout of construction alignments, critical points captured during scanning, as well as miscellaneous features such as the sidewalk, curbing, and pavement as needed throughout construction.