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Slip A6 – Night works drilling piles in preparation for the day team to install the reinforcing cages.
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Slip A6 – Night works drilling piles in preparation for the day team to install the reinforcing cages.

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SH1 Mangamuka Gorge slip repairs – April 2024 update

Kia ora koutou,

With a much drier autumn than last year, works continue at pace with three shifts running day and night. This month we have completed a third slip site, A3, with several more sites in the final stages of completion. 

On top of the slip repairs, work has begun on drainage repairs and upgrades through the gorge, so it’s better equipped to handle future weather events. 

It’s important to us to actively work with the whole community to share what is happening in the project. Next month, we are inviting media to visit and share progress with the community. This month, we had the opportunity to show our hapū and iwi partners from both sides of the Maungataniwha Range the work happening onsite. It was great to be able to update them on the scale of the project and the tremendous mahi the workers have achieved to date. 

The project team is continuing to work around the clock, making great progress and completing as much as possible before winter.

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A kauri snail (pupurangi) crossing the road by the worksite.
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A kauri snail (pupurangi) crossing the road by the worksite.

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Slip A11 Wildlife Relocation Underway

We are working closely with New Zealand Environmental Management and hapū to survey any native or endangered species which may be at risk of impact by our work and relocate them away from our construction sites.

Our specialist team of ecologists, kaitiaki, kiwi dogs and handlers, and arborists have been busy carefully clearing slip site A11 of vegetation and safely relocating a variety of wildlife away from construction. Specially trained dogs search the area each morning before work starts to check for kiwi that may have entered the area overnight. So far, no kiwi have been found, but checks continue.

During this search, the teams have already discovered and safely relocated multiple different at-risk and threatened species, including native kauri snails (pupurangi), and several different species of wētā.

There is also a known presence of long-tailed bats (pekapeka) in the Maungataniwha Range. Automatic bat monitors have been set up to measure their high frequency signals through special bat software. During the colder months, the bats are less active while they conserve energy. This puts them at greater risk from any work around their habitat, so any potential roosting areas need to be removed before winter. Any trees that are identified as a potential habitat are carefully inspected before and after felling to ensure that these nationally critical species are protected.

As well as the work being done to relocate species from within the site, we have also recently set up a series of stoat and rat traps along the edge the highway as part of the ongoing pest control on site.

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Moxy dump trucks at work during the current Brynderwyns closure.
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Moxy dump trucks at work during the current Brynderwyns closure.

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Slip A11 Excavation to Begin

The A11 slip repair is different from the concrete pile retaining walls that are being installed for most of the other slips in the gorge. For this repair, over 30,000m3 of material needs to be removed from the Maungataniwha Range and taken to a local site at the foot of the range. The repair also involves realigning the existing road away from this slip-prone site.

This work is carefully choreographed and highly intensive over a short period of time. As part of these works, the current southern access area will be used as a transfer site to move between the large 6-wheeled Moxy dump trucks onto road-legal dump trucks to the tip site. During this period, the southern gate will be relocated 500m south of the current closure point.

These works began at the end of April. They are weather dependent and are expected to take around a month. The southern gate will be returned to its current location when the works are completed.

These truck movements will cover approximately 7km of SH1 from the southern gate to the tip site access. There will be a traffic management plan in place to minimise disruption. However, if you are in the Mangamuka area, you may see an increase in truck movements over the coming weeks while we undertake these works.

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April 2024 Progress Update

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Slips A1 and A2

All enabling works and permanent casings for the 1050mm diameter piles are complete.

The programme for the permanent piling operations at this slip is one of the final tasks among all the critical slips.

Since we have positioned the large rigs further up the site, this will be the last slip site to be completed.

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Slip A3 – Final anchors have been installed.
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Slip A3 – Final anchors have been installed.

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Slip A3

Rehabilitation works – complete!

The anchor team has successfully installed all 40 anchors at this slip site. With only stress testing remaining, and the drills have moved over to Slip A12.

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Slip A4 – Pile casings screwed in place ready for piling.
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Slip A4 – Pile casings screwed in place ready for piling.

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Slip A4

Rehabilitation works – 0/36 permanent piles complete.

Permanent work has started with the team splicing and screwing the casings into location in preparation for the piling to commence.

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Slip A5

Complete!

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Slip A6 – Driving the lagging plates behind the piles using a giant compression hammer.
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Slip A6 – Driving the lagging plates behind the piles using a giant compression hammer.

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Slip A6

Rehabilitation works – 34/54 permanent piles complete.

We are continuing to run night and day shifts on Slip A6.

The night team is drilling the permanent piles to depth while the day team is managing the reinforcing cage placement, tremmie pipe installation, concrete pours and the installation of the lagging plates behind the piles.

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Slips A7 and A8

The designs have been finalised.

While the slips are both deemed critical, they are easier repairs compared to the rest of the sites and won’t require the 1m diameter piles.

Minor site preparation has been undertaken on Slip A7 with the main works programmed once Slip A26 is complete in late May.

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Slip A9 – Cages and formwork in place to pour the top half of the capping beam.
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Slip A9 – Cages and formwork in place to pour the top half of the capping beam.

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Slip A9

Rehabilitation works – 48/53 permanent piles complete.

Piling is nearing completion. Working alongside the pilers, the steelworkers and capping beam team are preparing to pour the top half of the capping beam onto the completed half of the piles.

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Slip A26 – Universal Columns (UC) being installed.
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Slip A26 – Universal Columns (UC) being installed.

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Slip A26

Rehabilitation works – 34/72 permanent piles complete.

Work is progressing at pace. Over half of the scheduled UC beams are complete.

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Slip A10

Test anchors have been installed and tested.

The design involves installing new anchors to reinforce and tie the existing gabion wall back into the hill.

Work on this slip is scheduled to start in May.

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Slip A11 – Wildlife relocation is underway. The teams carefully clear the site of vegetation and relocate any wildlife that they find.
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Slip A11 – Wildlife relocation is underway. The teams carefully clear the site of vegetation and relocate any wildlife that they find.

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Slip A11

More detail around the works here can be found at the top of this newsletter.

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Slip A12 – Anchors are now being installed.
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Slip A12 – Anchors are now being installed.

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Slip A12

Enabling works – complete.

Rehabilitation works – 38/38 permanent piles complete.

The anchor drilling team is currently underway with 2 drills onsite. This needs to be managed carefully because the anchors need to be installed between the piles already installed on Slip A27, which is close by.

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Slip A13 – Cages being installed in preparation for the first capping beam pour.
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Slip A13 – Cages being installed in preparation for the first capping beam pour.

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Slip A13

Rehabilitation works – 43/43 permanent piles complete.

The capping beam and soffit are currently being installed. Once these have been completed the anchor team will continue from Slip A12 onto Slip A13 to complete all the works in this immediate area.

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Slip A27

Complete!

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Worker of the Month

Ko Maungataniwha te maunga
Ko tāpapa te awa
Ko Mangamuka te paparaorao
Ko Mangamuka to Marae
Ko Ngapuhi te whare tupuna
Puhi kai ariki, puhi moana ariki, puhi taniwharau e
Ko Rahiri te tupuna
Ko nukutawhiti e noho ki runga I te taumata
Ko Ngatokimatawhaorua te waka
Ko Victor Harris ahau

This month's Worker of the Month is Victor Harris, who joined the project as the Health and Safety representative for Ngā Hapū o Mangamuka me Mangataipa. With over 25 years of forestry experience under his belt, Victor brings a wealth of knowledge in risk identification and mitigation, prioritising the safety of all involved. Victor's dedication to learning exemplifies the ethos of embracing challenges regardless of age, all while serving as a staunch advocate for his family, hapū, and employer – Ascon Skilled Personnel.

Victor is a familiar face on site, known for his upbeat demeanour. He approaches challenges with determination, supported by his colleagues. Victor's enthusiasm and commitment to excellence and safety embodies the spirit of teamwork and progress on the project.

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Worker of the Month - Victor Harris

 
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Upcoming Events

A big thank you to everyone who came to see us at the Kaitaia Market and recent MSD Job Explore 2024 Expo. These pop-ups are an opportunity to meet members of the team working in the gorge.

Keep an eye out on our social media for future pop-ups:

NZTA Northland Facebook page

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Need more information for your local community group?

Our latest flyer ensures you and your community are kept up to date.

If you would like some printed copies 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.

To view the electronic version of the flyer, click here.

For more information on the project, please click here for 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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