An award-winner this year from Canada is the 57,600 square foot Kanata North Technology Phase II office building located in Kanata, Ontario, Canada.
The building is a handsome design with large expanses of energy efficient glass. The big story here, though, is speed of construction. General contractor Colonnade Development of Napean, Ontario, put this entire four-story structure up in one month.
In October, 1998, Tilt-Up wall panels were cast on-site while foundation construction, mechanical and plumbing utilities were installed simultaneously.
During the first week of November, the Tilt-Up process proceeded at the rate of one floor a week, with four stories and the roof erected in one month. The building shell was completed the first week of December, beating the unforgiving Canadian winter.
From groundbreaking to tenant move-in, the project took a total of 24 weeks, breaking all local records.
The owner is RT Realty Advisors of Toronto. The Tilt-Up subcontractor for Colonnade was StonEng Construction of Napean. The architect for the project was Edmudson Matthews of Napean, and the engineer was David Tomasula of LJB, Inc., Dayton, Ohio.
There was a tight site as well as a tight schedule for this project. This called for a great deal of cooperation. For example, the cast-in-place contractor erected a tower crane at one corner of the building that became a "permanent fixture" that had to be worked around while erecting wall panels using a mobile crane. During erection of the final panel (the corner of the fourth story) the two cranes performed a "ballet" of tandem movement so that the boom on the tower crane didn't interfere with the boom on the mobile crane.
The exterior walls have a very classy look that combines two shades of a rose-marble color. Tilt-Up panels were cast and then sand-blasted prior to erection to give an exposed aggregate finish on fascia panels.
Additional drama was achieved by pushing out the fascia on the ground floor four inches further than the outside walls of the higher floors. To keep the weight of the panels to a minimum, this was accomplished by increasing the fascia panel thickness by 1 inch and increasing the insulation thickness by 3 inches, demonstrating the flexibility of the THERMOMASS insulation system.
While Colonnade wanted drama in the building's appearance, the company wanted to avoid drama when it came to the matter of erecting panels 51 feet above the ground! Safety was a major concern.
To address the safety issue, both the tops and the bottoms of the wall panels were cast with PVC pipe inserts. The top inserts allowed for instantaneous erection of fall-protection railings once the panels were erected. Then, as the next story of panels were being erected, the railing was removed from the pipe inserts. In place of the railing, short pieces of rebar were accepted in the bottoms of the panel above, acting as a guide during panel erection. This system enhanced both safety and panel erection.
To speed the project, a separate Tilt-Up crew worked around the outside of the building while excavation, foundation counstruction, and utilities proceeded inside the building. In fact, the Tilt-Up crew had cast the first three floors of panels before the first floor was even set. An A-frame rack stored panels three deep in readiness for erection.
The result was a distinctive four-story office building completed in record time at a cost of $90 sq. ft. in Canadian dollars.
TILT-UP TODAY MAGAZINE / PROJECTS IN THE NEWS