Customer Showcase

At the rear of the facility is a 90-ton cyclotron capable of creating a beam of accelerated protons that can target deeply buried tumors. To prevent unwanted radiation exposure, the team placed the cyclotron and associated equipment into a large concrete “bunker” with walls as thick as 16 feet. The adjoining, steel-framed clinical facility includes treatment rooms, diagnostic tools, exam rooms, and offices. “The building really consists of two very different structures,” says Mangin.

Coordination between the two structures was challenging. For example, much of the building’s piping and electrical conduit has to pass through the bunker wall, necessitating careful planning. “All pipes had to follow a Z-shaped path through the wall,” says Mangin. “A misplaced pipe or conduit would be potentially catastrophic—and very expensive.” Because each structure behaves very differently during a seismic event, the team also had to ensure that the crisscrossing mechanical, electrical, and plumbing (MEP) systems could accommodate different rates of movement.

Revit MEP software proved helpful in overcoming these and other design challenges. For example, the main mechanical room is on the patient side of the facility. “We had to run piping underground, through thick concrete walls, and have it emerge in very specific locations in the bunker area,” says Aryak Goswami, a mechanical engineer at Haskell Architects and Engineers, P.A. “BIM helped us visualize how to place the pipes and conduit with a high degree of precision. That is critical on complex buildings.”

Another challenge was coordination with the proton beam manufacturer. “Their equipment is custombuilt, with very precise tolerances—as little as one thousandth of an inch,” says Goswami. “Revit’s 3D modeling and visualization helped us meet those tolerances and keep up with any changes that occurred during design—saving considerable coordination time.”

Once the digital model was complete, the design team walked through it virtually with the client and other stakeholders using Navisworks Manage. “We showed them what the completed facility would look like, checked for conflicts, and gathered feedback that helped improve the design,” says Goswami. “That’s where we got the most benefit from the software.”

During construction, Navisworks proved valuable in completing the facility’s concrete wall, which required a sequence of pours. “The builder compared printouts of the 3D model with the pipes and conduits that were actually installed, verifying their accuracy before each pour,” says Mangin. This process helped the builder catch a missing pipe and make a correction in time to avoid significant—and very costly—consequences.

At one point, the model helped avert a potential catastrophe when it was determined that the proposed location of underground electrical conduit would pose a risk to the cyclotron during transportation onsite, as well as to the building. Using information from the model, the team illustrated the risks associated with the mistake and helped the subcontractor make the hard decision to relocate the conduit. “Those risks would not have been obvious without BIM,” says Goswami.