When it opens in 2023, a new healthcare facility for MedStar Georgetown University Hospital in Washington, D.C., will feature the latest medical and technological advances. Clark Construction, along with architects HKS and Shalom Baranes Associates, assembled a BIM model of the existing utilities. As design progressed and the basic structure and caisson locations were set, “we performed additional borings at all caisson locations and further informed the 3D BIM excavation model,” said Hunter.
Team turns to technology on site
Clark performed a preliminary survey with traditional survey instruments, such as the Leica MS50, which combines total station functionality, GNSS connectivity, digital imaging and 3D laser scanning in a single instrument. The 3D technology performed checks of slab edges, precast concrete, joints and floor flatness. The technology also coordinates existing buildings to perform tie-ins with the façade.
After completing and setting survey control points around the site, the team began the scanning and layout process, said Kathleen Lavelle, project manager at Clark Construction Group.
“For 3D laser scanning, we use our Leica MS50 again which has full scanning capabilities. We use our survey control points to tie the scanning data into site coordinates. After scanning is complete, Leica’s Infinity program is used to clean up the scan,” said Lavelle. “This can be exported to different file formats depending on the software being used to work with the data.”
The survey team used Leica MultiWorx, an add-on app to Autocad Civil 3D. This scan data can be used to generate existing conditions and as-built drawings as needed.
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