The project involves installing very thick CIPP structural liner in Brick Barrel Sewer and Stormwater pipes close to the Christchurch CBD.

• Various large egg-shape and elliptical pipes
• Designed to withstand earthquake liquefaction effects
• Due to the size of the project the installation speed had to be increased by a factor 3
• Working in heavy traffic in an inner-city environment
• By-passing of sewer flows of up to 300 litres per second
• All resin mixing was done inside the "Red Zone" to reduce risk
• Confined Space entries

 Project Scope

• CIPP lining of pipes varying in diameter from 450mm to 1,350mm in diameter
• Working in the main arterial roads around the CBD such as Moorhouse, Kilmore, Madras and Fitzgerald Avenue
• Over the manhole resin impregnation is used due the sheer volume and size of the CIPP materials
• The project involves creating temporary and permanent access to the pipes
• Major alterations to large manholes up to 4m deep including well pointing & trench shields
• The CIPP pipes were designed to a much more severe standard to cater for future earthquakes.
• All pipes were more or less permanently flooded
• By-pass pumping involves major volumes of sewage pumped above and below ground in busy streets

Project Outcomes

• All sections of CIPP liner were installed to a high standard
• The disruptions to traffic and residents have been kept to a minimum
• The speed of installation is much higher than on any other large diameter CIPP project in Australasia
• The scale of the project makes it easily the largest CIPP project ever undertaken in this part of the world