Humes is demonstrating the power of Vibration Technology in an ambitious development, labelled by Auckland Council as one of the biggest stormwater projects it has ever undertaken.
The Artillery Drive project seeks to mitigate flooding in a new Special Housing area in Takanini by adding capacity to the stormwater network downstream of the McLennan Park Pond. Auckland Council awarded the project to McConnell-Dowell, who brought in Humes to manufacture a stormwater pipe capable of handling the large volume of water that will be diverted.
Humes fires on all cylinders.
With a 2500mm internal diameter, and estimated to be made up of 360 pipes at completion, stormwater tunnels of this size are rare. It’s the first three metre jacking pipe in New Zealand, and Humes went above and beyond by providing a specialised mould that could meet the contractor’s requirements. “We’d never produced a pipe of this diameter before, and it’s the heaviest pipe we’ve made too” says Steffan Robertson, Humes Concrete Product Design Manager. “That caused some logistical issues, including requiring us to get a new forklift truck that could actually handle the weight!”
Using the advanced Vibration Technology (VT) manufacturing process to create the tunnel, Humes is already saving time and money on the Artillery Drive project. Humes is the only company in New Zealand to employ VT in pipe manufacturing.
To complete the project on time, McConnell-Dowell need to lay around five pipes per day. Traditional techniques for manufacturing pipes usually produce up to three pipes per day, but with the VT process up to eight pipes a day can be manufactured. Humes also had to install new technology to cure each pipe, a process that maximises pipe durability. With a pipe curing period of 28 days, Vibration Technology is crucial for keeping the ambitious project on track.
Gunning for more.
Being involved in a project of this scale has been hugely rewarding for the Humes team. The stormwater tunnel has presented a number of unique challenges, including difficult technical requirements, stringent testing and reporting standards, and extremely tight deadlines.
“One effect of this project is that it’s dramatically improved all of our Quality Assurance processes” says Robertson. “We had to provide documentation for every pipe, so the contractors could be assured that once it was in the ground it would be a strong, reliable and lasting product”.
Taking part in a project that makes a difference to communities makes it all worth it for Humes, who are looking forward to taking on even bigger contracts in future.
Quick-fire facts about the Artillery Drive tunnel
- The tunnel can carry 82800 cubic metres of water an hour - it could fill an Olympic swimming pool in under two minutes!
- Each pipe weighs 16.2 tonnes - meaning Humes will be producing 5832 tonnes of concrete pipe.
- Each pipe can withstand a jacking load of 1000 tonnes- equivalent to the weight of two Airbus A380 planes! (Jacking load is the force along each pipe when it is being pushed into place.)