Ōrākei Main Sewer repair and relining

Project overview

Below is a map of our repair route for the Ōrākei main sewer.

Repairs

Stage 1 is complete

We completed stage one and handed the carpark on Saint Georges Bay Road back to the owner in October 2024.

Stage 2: Relining

Stage two of the sewer’s rehabilitation involves the construction of a deep shaft in the northern section of Alberon Reserve and relining of the sewer between manholes 14 and 15 (refer map above) with glass reinforced plastic liner. This technology will enable the Ōrākei main sewer to continue in service for another 100 years.

Current updates

• The construction of our shaft down to an approximate depth of 13 metres in Alberon Reserve to access the Ōrākei main sewer is now complete. The construction process involved completing the shaft in sections, with timber poles and large steel beams used to provide structural support.

• On 7 April 2025 we commenced nightworks. These nightworks are estimated to take place for approximately 11 weeks.

• Our grouting team have now established on site with their specialist gear and equipment. They have been busy building bulkheads in the live sewer flows, which are like a big seal at either end of the pipe, between the old tunnel and the new liner. These bulkheads will keep the grout inside the annulus and help secure the liner in position.

• Auckland Transport has passed a parking resolution on the corners of Alberon Street, between the hours of Monday to Friday 10am – 3pm. This parking resolution is required to allow the delivery of equipment using heavy vehicles to support the repair of the Ōrākei main sewer. Please refer to map below.

Upcoming works

• Starting in May 2025, the team will commence pumping grout (a highly flowable cement mixture) into the annulus, in a series of controlled stages.

• We will have noise monitoring in place for these works to ensure we are keeping noise to a minimum.

• Please note that every second night during our nightworks there will be 1-2 concrete delivery trucks going to the site.

• The odour suppression system has been installed and will be commissioned shortly. With cooler temperatures and the installation of the suppression system we expect to see a good improvement of any odour issues.

Alberon Reserve walkways and access

During construction Alberon Reserve walkways will remain open, however, there will be sections of the Reserve which will fenced off for health and safety. While these parts of the reserve are fenced off, access between Alberon Street and Saint Georges Bay Road will remain as well as the pathway between Alberon Place and Havana Coffee. The southern section of the reserve will remain open for normal recreational use. Please see the below map.

Future works

Our team are currently exploring new options for what our proposed future works will look like, and we will keep the community informed as the project progresses.