New York State Department of Transportation
NYS Rt. 31 State Street Bridge Rehabilitation (D264306)
Pittsford, New York
To assist with a rehabilitation effort on the State street bridge on NYS Route 31 in the town of Pittsford, NY, GdB Geospatial was hired to provide a laser scan and point cloud throughout multiple phases of the project.
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 to ensure accuracy of the resultant survey. To complete the laser scan of the bridge, six semi-permanent targets were first placed at strategic locations to monitor the bridge during the demolition and reconstruction phase of the project. Utilizing stationary LiDAR, the top of deck and underside of the bridge were scanned, covering all visible components including stringer, flood beams, and low chord. A 3D Point Cloud was prepared from the resulting scan data, including the monitoring targets, for use by the contractor.
From the resulting point cloud of the bridge, GdB extracted a CAD file which included all critical line work, structural features, dimensions and any additional planimetric and structural features requested by the contractor. This CAD file was delivered in the client’s preferred format.
Post-demolition of the State Street Bridge, GdB completed an additional laser scan of the exposed bridge stringers, floor beams, and monitoring targets that were previously established on site. Utilizing the resultant point cloud, GdB extracted critical points for monitoring throughout reconstruction. These critical points were organized into an Excel table for comparison throughout reconstruction.
Once the State Street Bridge construction was complete, GdB returned to the project site to complete an as-built of the deck and underside of the bridge covering all critical components. This was also accomplished utilizing Stationary LiDAR.