2/21/2023 0 Comments Underpass drainage channels![]() ![]() Maintenance 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. For real-time highway conditions statewide, visit ADOT’s Traveler Information Site at follow ADOT on Twitter ( or call 511, except while driving.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). For more information, please call the ADOT Bilingual Project Information Line at 855.712.8530 or submit a question or comment by email. Subscribe to receive project updates and traffic alerts by email. Schedules are subject to change based on weather and other unforeseen factors. Weekend, weekday and overnight work will be scheduled.ADOT will maintain access to homes, businesses and other properties in the project area via alternate routes.The cross streets in the project area will be closed at times.Drivers who typically use the frontage roads should plan to use alternate routes and allow extra travel time.The south- or northbound I-17 frontage road will be closed around-the-clock during each phase.Phase 4: Thunderbird Road to Greenway Road.Phase 3: Cactus Road to Thunderbird Road.Phase 1: Arizona Canal Diversion Channel (ACDC) at Dunlap Avenue to Peoria Avenue.Four phases of construction are scheduled: Work began at the south end of the project near the Arizona Canal Diversion Channel and will proceed north to Greenway Road. 14, 2020 Project ScheduleĬonstruction started in early 2020 and is anticipated to end early 2023. Presentation to the Phoenix City Council - Jan. View an illustration ( English | Español ) of how a gravitational flow drainage system works. ![]()
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