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SH1 Mangamuka Gorge slip repairsProject update |
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30 August 2024 |
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We recently said goodbye to our largest drill rig the LB24, but not before stopping by Pāmapūria School. SH1 Mangamuka Gorge slip repairs – August 2024 updateKia ora koutou, We continue to make great progress. This month has seen a lot of activity - 2 more slip sites are complete (A26 and A12), with another 3 (A7, A8 and A10) on track to be completed next month. The remaining critical slips are all in the final stages of completion, in preparation for the pavement and road barrier installation over the next 2 months. We have also reached two major milestones: all of the larger 1050mm diameter piles are now in place, and the stormwater upgrades are complete. We remain on track to reopen the road by Christmas this year. |
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Click on the image above to watch the July 2024 flyover on YouTube. Behind-the-scenes project videosIf you missed it last month, check out the links below to see our July 2024 flyover and new behind-the-scenes project progress video updates. This is part of a series of videos we will be sharing over the coming month which give you a sneak peek into various aspects of the project and the people involved. Mangamuka Gorge slip repairs flyover: July 2024 How local workers are shaping the future of Mangamuka Gorge Voices of Mangamuka Gorge: Howard Mills Rebuilding Mangamuka Gorge: complex engineering for extreme weather |
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Slip A47Rehabilitation works: 4/31 permanent piles complete. Work is underway with the casings and piling on this repair. The wall design for this slip is a UC-beam H-pile wall, like the walls at Slips A7 and A26, however it won’t be as long or as deep. Despite the impressive photos, this repair isn’t as complex as the majority of the other repairs as the slip hasn’t washed away any of the road adjacent to it. The crew installing stormwater and sediment controls around A47. |
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Slips A1 and A2Rehabilitation works: 40/40 permanent piles complete. The steel for the capping beam has been installed, and formwork has been delivered from Slip A4. Preparations are underway to begin constructing the final capping beam for the 1050mm diameter pile walls. Formwork being installed for the capping beam. |
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Slip A3Rehabilitation works: 40/40 permanent piles complete. The guardrails have been installed. Reinstatement of the road will complete all works on this slip. Guardrails have been installed. Last step – pavement and disestablishment around the site. |
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Slip A4
Rehabilitation works: 36/36 permanent piles complete. The capping beam is now complete, and anchor installation has commenced. |
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Slip A5Rehabilitation works: 25/25 permanent piles complete. The guardrails have been installed. Reinstatement of the road will complete all works on this slip. Guardrails have been installed. Last step – pavement and disestablishment around the site. |
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Slip A6Rehabilitation works: 54/54 permanent piles complete. The capping beam has been completed. Next up, the anchors will be installed. Anchor installation has now started. |
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Slip A7
Rehabilitation works: 54/54 permanent Universal Column (UC) piles complete. The final H-beam pile has been installed for this site. |
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Slip A8
Rehabilitation works: 41/68 permanent Continuous Flight Auger (CFA) piles complete. Piling in the narrow carriageway. |
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Slip A9
Rehabilitation works: 53/53 permanent piles complete. Installed anchors before testing and trimming. |
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Slip A26Rehabilitation works: 74/74 permanent Universal Column (UC) piles complete. The installation of the concrete panels is now complete, and the crews have demobilised from the site. Reinstatement of the road will complete all works on this slip. The concrete panels have been installed and the ground behind the wall backfilled. The next step is reinstating the road. |
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Slip A10The drainage is complete, and we have begun road reinstatement. Our engineers have been monitoring and testing the ground with the ongoing weather events over the last 18 months and there has been little to no movement since the initial slip. The drainage has been upgraded and work has commenced on the existing gabion wall. The ground behind the wall will be stabilised before reinstating the road surface. The upslope stormwater chutes installed as part of the stormwater upgrades. |
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Slip A11This area has experienced movement during the winter months, and our geologists and TARP sensors are continuing to monitor it closely. While we have continued to see movement, the cut we made earlier has taken a lot of pressure off the hillside. This has also created a buffer which helps keep our teams safe and means that, should there be further slips, it will not fall onto the road. This has allowed us to continue with the drainage upgrades and pavement installation. The final repairs will be completed after winter to stabilise the slope further, including removing any loose material that has the potential to move. Pavement installation is underway to reinstate the road. Barriers are in place to ensure our teams are working outside of the buffer zone. |
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Slip A12Rehabilitation works: 38/38 permanent piles complete. The pavement teams have started onsite. Guardrails are being installed. The temporary H-beams installed as part of the enabling works have been cut to road level, and the area has been filled to road height. Complete and ready for the pavement crews, with A27 on the right-hand side complete. |
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Slip A13Rehabilitation works: 41/41 permanent piles complete With varying ground conditions and different geology to other slips sites in the gorge, the installation of the anchors on both A12 and A13 have been extremely challenging and have required innovation staging. In order to keep up the pace on the programme, the anchor teams have moved to A6 while the pavement teams complete the reinstatement of the road from A12 to A13. Once the pavement crews have completed their work, the anchor teams will return to complete the remaining anchors with added protection to ensure they don't damage the new road surface. Anchor teams ballet as they install the anchors. |
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Slip A27Complete! |
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Aerial photograph taken by Whites Aviation. 18 April 1962. Mangamuka Gorge, Northland. Whites Aviation Ltd: Photographs. Ref: WA-57287-F. Alexander Turnbull Library, Wellington, New Zealand. /records/23036791. Looking back to the past - the history of Mangamuka GorgeMangamuka Gorge has served as a crucial route for centuries, originally used by Māori as a bridal path before the official track was cut in 1840. It took 50 local Māori 6 weeks to go from the Kaitaia Mission Station to the Mission at Waimate North. The road through the gorge was built in 1930, taking 2 years to complete. It was a basic track, prone to mud and slips in wet conditions, but became the main connection between Kaitaia and the Ōkaihau rail head. In the 1960s, extensive work was carried out with Laurent contractors (now part of Fulton Hogan) doing the Northern side and McBreens completing the Southern side (now part of Ventia). At the summit of the gorge stands a concrete monument dedicated to Henry Havelock Thompson, the civil engineer who surveyed and helped build the road. His granddaughter, Colleen Henderson, has shared her deep connection to the gorge and the significant role her grandfather played. She has been dedicated to maintaining the monument, often removing graffiti to keep it in good condition and honour her grandfather’s legacy. |
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Mangamuka Gorge Road, showing Mr Henry Havelock Thompson's Model T ford being horse-drawn out of the Gorge. Circa 1922. Auckland War Memorial Museum Tāmaki Paenga Hira. PH-NEG-C12233. |
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A Model Ford drives through the Mangamuka Gorge. Photograph taken circa 1930s. Mangamuka Gorge. Northwood brothers :Photographs of Northland. Ref: 1/1-010942-G. Alexander Turnbull Library, Wellington, New Zealand. /records/22785894. |
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Glass plate negative – Mangamuka Gorge. E. Bradbury & Co. published a series of books called "The settlement and development of ..." about various areas in New Zealand during the 1920s–1940s. The company was founded by Ernest Bradbury (1868–1955). Collection of Waikato Museum Te Whare Taonga o Waika |
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Worker of the monthOur Worker of the Month is a familiar voice heard on our flyovers, CLL PR Manager, Kylie Harris (née Rameka).
“Nō Muriwhenua ahau Kylie is a proud local wahine who specialises in Communications and Community Engagement. Kylie finds great fulfilment in her role. By providing regular updates about the project to the local community, Kylie ensures that the community stays informed and connected to the ongoing works. Outside of her professional role, Kylie is deeply involved in her community. On weekends, you might spot her at local rugby fields, where she volunteers her time as a Referee and Assistant Referee with the Northland Rugby Referee Association. Her passion for sports extends to netball as well—she actively participates in the local Mangonui Netball competition with the club “Far North Phoenix” as both a player and an umpire. As a mother of two, Kylie is dedicated to inspiring not only her own children but also all rangatahi and tamariki in the region. She believes in the power of staying within the rohe (community) to achieve success and encourages others to pursue what they love. Worker of the month – Kylie Harris checking out the work on the recently completed A26. |
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Your feedbackIn last months newsletter, we invited you to provide feedback on our project communications and let us know where you'd like more detail. We appreciate your feedback. This survey will remain open until the end of 31 August 2024. After that, we’ll review and analyse your feedback and share the results in next months newsletter. |
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Need more information for your local community group?If you would like some printed copies of our flyer to hand out to your whānau or community group, send us an email at northlandproject@nzta.govt.nz with your name, mailing address and the number of copies you need. We’ll then pop them in the post directly to you. Electronic version of the flyer
For more information about the project, visit the website: |
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More information |
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For more information on the SH1 Mangamuka Gorge slip repairs, contact us at northlandproject@nzta.govt.nz Visit our website www.nzta.govt.nz/mangamuka |
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