McKnight Boulevard Pedestrian Overpass
Located near 44 Street in northeast Calgary, a pedestrian overpass was needed to allow pedestrians to safely reach a school and a commercial district on either side of the busy, multi-lane McKnight Boulevard.
ISL provided preliminary engineering, detailed design and construction administration for a twin girder pedestrian bridge, as well as the associated regional pathway extensions, utility diversions and drainage and landscape elements.
To cross 55 metres of roadway with a depth-to-span ratio of greater than 20, ISL configured the union of two steel plate girders with a maximum depth of 2.4 metres, thereby exceeding the design criteria for a slender bridge profile.
To minimize traffic disruptions on the busy McKnight Boulevard, it was decided to erect the twin bridge girders in just one night. Carefully planned and executed, temporary traffic control and lighting allowed both the girders and the precast decking units to be installed successfully with minimal disturbances.
To stay on schedule, much of the abutment concrete pours and bridge construction took place during harsh winter conditions. Special portable industrial heaters and insulated tarpaulins protected the freshly poured concrete from the cold weather.
The McKnight Boulevard Pedestrian Overpass opened to the public in September 2009.