POWERDRAIN Trench Drains by ACO Polycrete used in Johnston Tunnel, NZ’s First Tollway
ACO Polycrete specialises in a range of trench drains, cable pits and access covers.
The Northern Motorway Extension is New Zealand’s largest road project investment and the nation’s first tollway.
The route spans a scenic 7.5 kilometres between Orewa and Puhoi, north of Auckland and is designed to offer significant safety and greatly improved transit times for motorists.
The infrastructure will also help to relieve holiday time congestion and heavy traffic in Orewa and Silverdale.
The new route incorporates a total of five bridges and twin tunnels including the 290-metre long Johnson’s Hill Tunnel with twin entries. This tunnel is concrete lined, fully lit as well as ventilated and has a fire protection system.
Along its various sections, ACO’s heavy duty trench drains were installed. Designers believed this drainage system was sufficiently robust and secure for the tunnel application.
In addition to the trench drains, ACO also supplied RHINOCAST 2-part access covers to meet the project’s load specification.
ACO’s civil construction products are installed globally in a number of infrastructure projects including roads, airports and ports.
For over 15 years, Australasian Road Authorities have used ACO drain systems in a variety of applications ranging from tidal flow and kerb drainage on footpath and super elevated medians as well as beneath overpasses and across interceptions.