Greville Road Stormwater Culvert
The Greville Road Stormwater Culvert was identified as an Emergency Works project by Auckland Council Healthy Waters after major Auckland floods in January 2023.
The urgent nature of this project meant that it was important for Healthy Waters to get this work completed immediately. McConnell Dowell was on the Healthy Waters Pipelines and Tunnelling Panel and had a tunnelling team ready to go.
Although the initial scope was to excavate and remove the collapsed culvert and replace it with a temporary shaft, it was decided that this shaft could be designed and constructed to accommodate the permanent inlet at the same time. This avoided rework later, saving time.
how did we optimise, earlier?
We were brought in for fast response to High Risk Emergency Works.
Working closely with the contractor and client, the geotech team developed a fast and efficient design for the launch and two retrieval shafts. The shaft designs resulted in less carbon by minimising the quantity of reinforcement required in the launch shaft. In addition, Andy O’Sullivan provided technical assistance for the mTBM operation including jacking force calculations, inputs into pipe selection and thrust block designs.
The project was hailed as a major success given its classification of High Risk, Emergency Works.
The input we received from Andy’s team needed to be quick, innovative and of course effective to enable the works to proceed with minimal risk. And that is what we got.
