John Laurie Boulevard: The main span is 60 metres; overall length of the structure, 102 metres. The south turning girder was 47 metres long, the north 37 metres and the drop-in span had a length of 17.8 metres. Two 100 millimetre joints were provided at the ends of the drop-in girder. The horizontal radius of curvature is 200 metres along the centreline of the walkway which is 2.5 metres wide. The cost was C$1,225,000 or about 2.3 times the cost of the 146 Avenue overpass per square metre of deck – higher partly because of the small size of the structure and the absence of ramps which are the less costly part of a pedestrian overpass. A curved box section is more costly than a straight tee section. The bridge received the 2007 ACI Alberta Chapter ‘Award of Excellence for Design and Construction in Concrete’ in the bridges category.
33
Tom Martin
Made with FlippingBook interactive PDF creator