In Bethesda, Maryland, a suburb of Washington, D.C., Clark Construction is nearing completion on The Wilson & The Elm, a mixed-used development that, when finished, will include 348,000 square feet of office space and 456 apartments. Clark faced challenges in bringing large materials and cranes onto the jobsite located in Bethesda’s busy retail and shopping district. The tight space was exacerbated by nearby work on Maryland’s Purple Line light-rail project and Metro’s subway Red Line improvements, so the contractor was forced to have only one lane on the street next to the jobsite for vehicles entering and exiting. 3D laser scanning was used to provide the project personnel with digital models that provided the visualization needed for success.
From an article in Construction Dive by Zachary Phillips.
“Suffice to say it made the job challenging to logistically guide this project through its duration,” said Pasco Umbriac, vice president at Clark, during a recent virtual tour of the $300 million project.
At the outset of the project, the Clark team assembled 3D and 4D models — ones that present how movement and timing can work on the jobsite — to show team members what the project would look like and how trucks and cars would move onto and off the site. The 4D model convinced stakeholders the project could work within its space constraints better than a 2D drawing could have, Umbriac said.
For instance, as the shell for the Purple Line was put in place near the foundation of the buildings, Clark needed to rapidly build out rakers for support near the concrete wall. The short time to install the steel support beams prior to the pouring of the shell meant the VDC team needed to constantly model and adapt it to make sure they didn’t hit any structural “widgets,” said Umbriac.
“We were thinking about how to get [the rakers] all out in time,” said Brandon Hatathlie, assistant superintendent on the project. “Then we used reality capture and laser scanning to see the accuracy of what we conceptually thought was the plan.”
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