3/7/2023 0 Comments Underpass drainage channelMaintenance manholes were also provided to allow high pressure jetting. Calculations showed the Cavidrain has high redundancy with many flow paths. The smooth HDPE surface minimises the attachment of calcium carbonate and iron oxide. This saves on unnecessary extra dig for equivalent drainage stone and pipes which provided considerable savings. Wet concrete completely fills the upturned cups and, when set, transmits load to the base slab leaving large channels in all directions for water flow.Ĭavidrain is delivered stacked on pallets for easy transport and laid out in a matrix by hand. The high density polyethylene (HDPE) void former is easily jointed or overlapped and sealed to form a waterproof lining to the underside of the slab. This would quickly clog any granular drainage system.ĪBG Cavidrain Invert S60 was offered as a multi direction, large void, impermeable drainage system under the whole of the floor area. An additional challenge is that the area geologically is made up of calcareous limestone and iron ore which in solution deposits precipitate on any surface forming a thick, impermeable crust. This requires much excavation and the hauling of expensive granular drainage stone along the length of the tunnel in cramped conditions. Traditionally, a thick granular drainage blanket with additional strip drains and pipes is used. In certain places in the tunnel, large flat areas of slab were constructed needing a drainage system with a fall to take water away. Transcity was the consortium responsible for the design, construction and operation made up of BMD Constructions and tunnellers Ghella and Acciona Infrastructures.Īs with any tunnel project, the waterproofing and drainage of the tunnel invert is important to prevent internal corrosive damage to reinforced concrete floors and avoid uplift pressures on the tunnel structure. Opened in 2015, Legacy Way halved the peak hour travel time. Legacy Way is Brisbane City Council’s award winning 4.6km twin parallel tunnel project that connects the Western Freeway with the Inner City Bypass (ICB).
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