Drawbridge Counterweight Measurement



BURNSIDE BRIDGE

Customer Advanced American Construction
Location Portland, Oregon
Task Create coordinate system. Assess parallel travel the bridge trunion assemblies

ATT Metrology was contracted by American Construction to provide laser tracker support to assist in the renovation of the Burnside Drawbridge constructed in 1926.

ATT’s support consisted of devising a coordinate system for the drawbridge leaf and counterweight mechanism and then to conduct measurement surveys of the parallelism of travel paths of the leaf versus the counterweight (bridge trunion assemblies). Surveys were conducted at night using two state of the art Faro laser trackers and four technicians with the bridge leaf in the closed, half open and full open positions.