State: Michigan City: Ann Arbor
Completed: 2018 Contractor: Wolverine Building Group
The collegian North project was initially designed as a cast in place shear core typically used for mid to high – rise construction. With schedules an ever-growing concern the choice to utilize precast components was selected to dramatically reduce schedule. Rapid, non-grouted connections were used to allow for rapid installation of the components without welding. The use of mechanical splices, bolted in place, allowed this project to be installed in five weeks.
"The 12 story shafts were a critical component of this project and they are one of the most challenging elements in our critical path schedule for the project. The shafts are providing the lateral resisting components for the entire building as well as picking up a fair bit of gravity load for the building. We had made the decision to do these three shafts out of pre-cast concrete in the hopes it would reduce the time durations in our overall schedule, which it did. The pre-cast erection started on April 16 and was completed on May 18, so the work was done in a 5 week duration which we estimate saved about 2 months out of our schedule when comparing other methods of constructing these shafts. We found it was also the most cost effective solution.
The work occurred in one of the most populated areas of Ann Arbor on an incredibly small site with tremendous logistic challenges with the requirement of just in time deliveries of the pre-cast panels. This all went off without a hitch and the city of Ann Arbor told us we were “talk of the town” and that they were very happy with the limited impact we had on their city’s traffic."
Bill Pursifull, Vice President at Wolverine Building Group
Precast Products Used: