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. The trail was designed in accordance with FDOT design criteria for trails and meeting ADA standards.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). ![]() Other project elements included concrete paving, asphalt paving, signing and pavement marking for the trail, drainage facilities, riprap along Channel A, BMP’s, and lighting under the bridge deck. This retaining wall was only a few feet away from an existing 30-inch reclaimed water main that required extra precautions during construction to avoid a blow-out. A poured in place concrete retaining wall was built adjacent to the trail. ![]() the trail approaches to the bridge required a downward slope and significant earth cuts that required a retaining wall system.the bridge abutment slope had to be removed to make room for the trail and a poured in place concrete retaining wall was built to support the earth under the bridge abutment.The portion of the retaining wall located under the bridge had vertical height constraints requiring special construction methods a sheet pile wall was required along the Channel A where the trail encroached into the water.the project required construction of three retaining wall systems.there was an existing SWFWMD permit obtained by the County for Sheldon Road a permit mod had to be obtained to include the trail project on an accelerated schedule.wetland and floodplain impacts were created where the trail encroached into the Channel A waterway and had to be mitigated.The trail design for this project involved several challenges: ![]() The project became eligible for Federal funding and the FDOT moved forward with this project using the Design Build alternative delivery method.
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