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Water ingress over 30 years has made a significant impact on a freeway bridge in Quebec City, resulting in total deterioration of the concrete and the breakdown of the rubber expansion joints at both ends of the 150 m long bridge. Highway authority, Transports Quebec, awarded local contracting company Inter-Structures Inc. the contract to replace the deteriorated concrete and fit new membrane seals. The bridge, close to the St Lawrence river and Quebec City, links highway 440 West and the boulevard des Chutes to provide access to a residential area and the renown Montmorency park and waterfall. Inter-Structures started work on the 22 week contract in June 2010. To ensure access to the damaged seals across the full width of the bridge, the contractor has removed more than 300 mm x 200 mm x 200 mm on each of the nine beams at both ends of the bridge and the 200 mm thick concrete slab; relying on 2 Atlas Copco “HardHat” XAS 185 air compressors, including a recently delivered unit on rental from Équipement LAV Inc. According to the company’s president, André Allard, Équipement LAV will be ordering up to 10 new compressors later this year to expand and modernize the fleet of 25 compressors with 100% “HardHat” units. “This is a must for me,” said André Allard. “No matter how old or rigorous a rental, once easily cleaned they look like new and are virtually indestructible.” “I have fully endorsed the range ever since we bought the first unit into Eastern Canada when they were launched,” he enthused. On the Inter-Structures project, both XAS 185 portable air compressors are supplying a free air delivery of 89 l/s at 7 bar (185 cfm at 100 psi) providing compressed air for three breakers each. According to a site spokesman, the Atlas Copco compressors can provide power for up to six breakers but at a reduced delivery.
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