Working as a foreman for 3DIS sister company Andy J. Egan Co., Inc., Terry Patterson oversaw the plumbing, HVAC and medical gas for Spectrum HealthPointe, a new 100,000 square-foot hospital.

When construction began, the job site was “pretty rough” according to Terry. There were no columns in place yet and the footings were deep, so his team couldn’t use the traditional method of pulling strings to lay out the underground.

3D Imaging Services conducting BIM Point Layout onsite at Mercy HealthPointe.

3D Imaging Services conducting BIM Point Layout onsite at Mercy HealthPointe.

By overlaying the virtual model at the construction site during surveying, 3DIS accurately identified all of the underground installation points. This BIM Point Layout Method uses preset control points and the underground prints to mark 3D coordinates for components such as risers, sinks and floors drains.

Underground plumbing installed with BIM point layout

Underground plumbing installed with BIM point layout

Lacking reference points from which to measure, Terry says that this layout process was the team’s only means of measuring and that attempting a traditional layout method would have taken at least two weeks longer.

The absence of strings running throughout the site was also a welcome improvement. There’s no danger of another colleague skewing measurements by driving equipment over a string or knocking a stake out of the ground.

In addition to easier installation for field employees, Egan’s engineers were able to maintain an accurate model throughout construction by accessing the as-constructed conditions in the scan data. Terry says he absolutely would use this layout method on his next project because “with the amount of money you save, it pays for itself.”

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