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Concrete In Australia : March 2014
NEWS 14 Concrete in Australia Vol 40 No 1 Early delivery for underpass despite challenges The final stage of the Perth City Link rail project was opened in December 2013 and despite it being delivered six months ahead of schedule, the project was not without its challenges. The Perth City Link Rail Alliance (Western Australian Public Transport Authority, John Holland and GHD) commenced work in early 2011 to build the new Fremantle Line tunnel and upgrade of Perth Station with two new features, an island platform for special events and the pedestrian underpass. Perth train commuters are now using the underpass to connect between Perth and Perth Underground stations, significantly improving access and transfer times. However, its construction posed several challenges for the engineers involved as it sits four metres below the water table and runs underneath a major arterial road and the heritage-listed Perth Station building. Work to build the underpass began in November 2011 using a combination of bottom-up and top-down construction techniques.Top-down construction was used inside Perth Station so trains could continue operating, travelling over the roof of the underpass, while walls and base slabs were being built below. Alliance Construction Manager Pat McCarthy explained the various challenges involved in pouring more than 7500 cubic metres of concrete to build the 162 metre long, seven metre wide, and three metre high underpass. “Piling was the first stage of construction. Working inside an operating train station meant access and space were restricted, limiting the type of piling rigs that could be used. “To form the structure of the Excavation works for the underpass below Wellington Street, Perth. 14-15 - News.indd 14 14-15 - News.indd 14 28/01/14 3:39 PM 28/01/14 3:39 PM