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Concrete In Australia : March 2013
Concrete in Australia VolVol 39 No 1 11 Tunnel works progress in Perth Works continue on building the new Fremantle Line tunnel, the linchpin for the Perth City Link project. e $360 million rail project, scheduled for completion in 2014, is the rst stage of the Perth City Link and is being delivered by the Perth City Link Rail Alliance, consisting of the Public Transport Authority (PTA), John Holland and GHD. e project includes relocating 600m of the Fremantle Line into a new cut and cover tunnel. e existing Joondalup line tunnel roof is also being extended to be in line with the new Fremantle Line tunnel. Tunnel walls are 70% complete for the new Fremantle Line tunnel and pouring of track slab is under way. A total of 623 precast concrete panels will form the roof of the tunnel, and 20% of these have now been li ed into place. Inside Perth Station upgrades are taking place to cater for the future growth of public transport. A new island platform will cater for special events and a pedestrian underpass will connect Perth Underground Station to all platforms inside Perth Station. Perth City Link Rail Alliance manager John Anderson said two major challenges for the project were working in sandy soil conditions with a high water table, and existing underground structures such as the twin-bored Joondalup Line tunnels. " e site is located above what was once Lake Kingsford and the water table is less than 1.5m below ground level. Water in any construction environment creates a challenge, and even more so when you re trying to excavate a tunnel. "To lower the water table while ensuring there s no movement in surrounding structures, water is pumped out, treated and recharged back into the ground using a specially designed dewatering system made up of over 300 dewatering wells," Anderson said. "We are also employing techniques that are rarely used collectively on jobs in Western Australia, but are o en seen on projects in high density cities such as Hong Kong or Singapore." A video update of progress can be seen at: http://www.youtube.com/ watch?v=ufKbvxgA3Oc. New Bus Station Planning for the second stage of the Perth City Link, building a new underground Wellington Street Bus Station, is now under way. In late January, the PTA issued a request for proposals to build the new underground bus station. e bus station, which was opened in March 1973, is the last public transport infrastructure obstacle to reconnecting Northbridge and the CBD. e tender process will run throughout 2013, with the successful consortium for the alliance contract to be announced in late-2013. To build the new underground station, the existing station must be demolished. e new underground bus station will feature Australia s rst dynamic stand-allocation system. e system will see incoming buses pull up at -- and subsequently leave from -- the next available bay. is means it operates much like an airport gate system. Works are expected to begin in 2014 and be completed in 2016. Tunnel walls are 70% complete for the new Fremantle line tunnel in Perth, with 623 precast concrete panels set to form the roof of the tunnel.