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EXTENSIVE MAINTENANCE AT LOFTY HEIGHTS The Sydney Harbour Bridge connects Milson Point in Sydney to the north coast, making it a major traffi c artery in the city. It has eight traffi c lanes, two train tracks, a pedestrian walkway and a bike path. Completed in 1932, the Harbour Bridge is subject to regular inspection and maintenance so as to ensure structural safety and to preserve its outward appearance. 10
For simplifying these maintenance tasks, the Harbour Bridge is equipped with numerous moving service bridges that are located under the traffic lanes and rail level – and 50 meters above the natural harbor of Port Jackson. These service bridges run on rails, giving the repair and maintenance teams safe access to areas on the underside of the bridge that would otherwise be barely accessible. While the bridge was being modernized, the New South Wales Roads and Traffic Authority decided to replace the existing pneumatic-hydraulic drive system with a state-of-the-art electric motor-driven drive system having variable speed drive (VSD). The Authority commissioned SAGE Automation, the largest, independent company for integrating automation and control systems in Australia, with integrating the system. SAGE decided to use a comprehensive solution package from SEW-EURODRIVE – the experts in drive solutions. “Our decision to use a complete drive package including motion control, VSD, geared brakemotors, encoders and HMI from SEW-EURODRIVE allowed us to significantly reduce the amount of equipment for each service bridge,” explains Robert Craig, Business Manager of SAGE Group. The biggest challenge presented by this project was in accessing the bridge itself. The majority of the drive system was not assembled at the project site, so that this difficulty could be worked out. All controls and drive components were sent to SAGE, where the control cabinets were assembled and configured before they were installed at their place of use. The geared brakemotors were installed directly on site. Not to mention that all work was carried out while the bridge was in operation. “Due to the tremendous importance as a traffic junction, it was impossible to close the Sydney Harbour Bridge completely at any time,” says Craig. “The Road and Traffic Authority’s coordinated and strategic closing of individual lanes was limited to an absolute minimum for carrying out the installation, as were the number and duration of closed lanes. Lanes were closed only to allow the correct positioning of the equipment. In this way, traffic impairments could be effectively curtailed.” For inhabitants of the city, the Sydney Harbour Bridge has been one of the most important traffic arteries for al- eurodriver LOCATION, MARKET AND WORLD most the past 80 years and is also a world-famous landmark for the city. Thanks to the updated and improved infrastructure on the hard-to-access underside of the bridge, it will be possible to inspect, maintain, paint and repair important structural elements in a simple and effective way. The bridge’s future can now be ensured for at least another 80 years. Author: Ash Vague / SEW Australia 11
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