Hakiaha Street works program
Overview
November 2021
- Council with our contractor partners have begun the long awaited upgrade to the underground water infrastructure along Hakiaha St/SH4.
- This will be followed by earthquake strengthening and beautification of the shop verandahs in partnership with property owners and the renewal of the footpath and roadway.
- As a combination of works these projects will significantly improve the resilience of our CBD infrastructure while enhancing the quality of experience for residents and visitors.
Project coordination
From the inception Council has always sought to align the various projects in order to minimise disruption to businesses and township users, and costs to ratepayers.
This has required Council to coordinate our township revitalisation works with Chorus installation of broadband fibre and Waka Kotahi NZTA renewal of SH4/Hakiaha St. Note: Hakiaha St is also a State Highway and as such the roadway is the responsibility of Waka Kotahi NZTA.
We have also looked to utilise specialist systems such as the Spiral Wound Pipe (SWP) trenchless pipe rehabilitation technology that is currently being used to reline the Hakiaha St sewage main to minimise disruption and costs.
Project timelines
| Chorus installation of fibre on SH4/Hakiaha St | Complete |
| Complete SH4/Hakiaha St sewer and storm water laterals (adjoining pipes) relining | 2021/2022 |
| Waka Kotahi NZTA renewal of northern end of SH4/Hakiaha St (inc. from intersection, bridge to Manuaute St) | March 2022 |
| Complete rider water main and laterals (adjoining pipes) to commercial properties (will use existing manholes for access for minimal disruption) | 2022 |
| Veranda earthquake strengthening and beautification | 2022/2023 |
| Footpath renewal | 2023 |
Hakiaha St sewage main relining
The Hakiaha St sewage main upgrade is being done using Spiral Wound Pipe (SWP) technology to minimise disruption and costs.
- SWP is a trenchless pipe rehabilitation technology that is applied by a specialist SWP Veolia team who were trained in Germany.
- SWP allows a new high grade PVC pipe profile to be wound into the existing host pipe at a smaller diameter, which is then expanded out to make a close fit new pipe within the old sewage main.
- Using Spiral Wound Pipe (SWP) technology means the old sewage main doesn’t need to be dug up which significantly shortens the life of the project and minimises disruption and cost.
The pic shows the pipe grade PVC profile that will be wound into a new pipe within the existing sewage main. Spiral Wound Pipe (SWP) technology means that a trench does not need to be dug to expose the old pipe saving time and cost.
How SWP works
- 11 access points are being dug along Hakiaha St 50m apart
- A specially adapted Veolia truck with a large spool of PVC Spiral Wound Liner is parked next to one end of the dug access points and a CCTV monitoring truck at the other
- The winding machine and a short section of the new liner pipe is aligned with the entry of the sewage main.
- A continuous strip of the pipe grade PVC then comes off the spool above ground and feed into a winding machine
- The spool feeds the winding machine which forms a new pipe profile within the original host pipe at a slightly smaller size
- The machine locks the edges of the PVC strip forming a impermeable seal
- This process of feeding and winding and locking continue the entire length of the host pipeline segment by segment
- Once the section is complete the PVC profile (pipe) is radially expanded within the host pipe to create a tight fit
- The liner is then trimmed and a robotic cutting machine runs inside the new liner and cuts holes for any lateral connecting pipes
