Project: Saline Creek Drive and bridges Project
Cost: $34 million
Location: Fort McMurray, alta.
Project Delivery Method: Traditional bid
Contractor: Sprague-Rosser Contracting Co. ltd.
Subcontractor: PCl Construction Management inc.
Architect: Associated Engineering Group ltd.
Complex and critical to growth needs
The Saline Creek Drive and Bridges Project—winner of the Alberta Construction Magazine Top Projects Award for civil projects valued at $50 million and under—is important and complex at the same time.
The project is important because of the critical role it will play in the future growth of Fort McMurray to the south and east—a community that has been challenged by infrastructure needs for well over a decade because of the boom in nearby oilsands projects. The project is complex because it involves several elements: construction of a roadway Complex and critical to growth needs bridge and a pedestrian bridge, two plaza structures and two outfall retaining walls, complete with steel gates to offer access into downtown Fort McMurray over the Hangingstone River.
The bridges were constructed using a semi-cast-in-place, post-tensioned structure and designed with business information modelling and 3-D scanning and printing.
The single-span, steel-arch pedestrian bridge features a geometrically complex 62-metre steel arch and cable-rod system. It was fabricated beforehand and brought on site for installation by crane. According to subcontractor PCL Construction Management Inc., which played a key role in this part of the overall project, the arch's baseplates had to line up exactly with the anchor bolt settings embedded in two cone-shaped concrete bases at either end of the bridge. What made it even more interesting is that the bases actually face in different directions.
On the day of the lift, the arch was lowered onto the cone bases. Once in place, construction workers and-tightened the bolts using torque wrenches. The entire process took eight hours.