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Our Solutions At Work
AECOM teams with Leica Geosystems on Wells Street Bridge project |
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PROJECT: The Wells Street Bridge carries vehicular, pedestrian, and train traffic into and out of Chicago's Loop district. The 350-foot-long bridge is a bascule design with two individual spans pivoting on fixed trunnions located at each end of the structure. Using large concrete counterweights, the spans can be raised and lowered to allow large boats to travel under the bridge. {PB}
CHALLENGE: The Chicago Department of Transportation (CDOT) retained the Dynasty group through AECOM to provide a professional survey. But surveying the busy bridge with a traditional total station, level, and measuring tape would take weeks of field time, resulting in disruptions to a crucial traffic route during rush hour.
THE LEICA GEOSYSTEMS SOLUTION: For portions of the bridge accessible to surveyors, the Leica HDS6000 phase-based scanner collected large amounts of high-density data, scanning 360 degrees of roadway, train track, and bridge steel in about 7 minutes. For inaccessible areas of the bridge, surveyors used four Leica ScanStation set-ups, one at each of the four corners of the bridge.
RESULT: Laser scanning increased crew safety by allowing the crew to avoid the electrified rail on the train tracks and other hazards of surveying a heavily trafficked bridge. With the data density from the phase-based scanner, Dynasty was able to generate the fine images of project components that the down-stream users desired. In addition, use of laser scanning helped reduce field time by 20 percent. {PJ, 28}
Additional Information:
Leica Geosystems High Definition Surveying Technology
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