The works to deliver the upgrade to the rising main were carried out in Halsey Street, in Auckland’s CBD. The location of the works meant the project was highly visible and in close proximity to surrounding businesses and the cities bus terminal. Traffic management was a continual work in progress, with multiple meetings held with Auckland Transport. Where possible, works were carefully planned during quieter periods to allow for peak traffic flow.
Effective engagement with various stakeholder groups helped to ensure the project was delivered successfully. The project team worked closely with Watercare, Auckland Transport, Auckland Council and utility providers to ensure the works were delivered in accordance with the program and without undue delay. Communication with the public and surrounding businesses helped to ensure this project was delivered with minimal complaints.
The outlet of the rising main was discharged into a major sewer truck main which was continually running full. The project team applied some innovative connection techniques to achieve a safe and effective connection detail in a very unfriendly environment.
Ground conditions encountered onsite were challenging, with 9m of fill imported into the area over a long period of time. With the area previously a harbour, the team uncovered a number of unexpected finds. A large excavator with an 8m tool with rotating cutter drums at the end was plunged into the ground in an effort to mass stabilise, following GPS coordinates whilst pumping in high volumes of cement grout. This mixed and set the ground to allow for seawater free trenches.
