Botanical Hill Completion, Nelson
Client : Nelson City Council
Scope of works : Slope stabilisation
Earlier this year the team wrapped up a challenging slope stabilisation project on Botanical Hill in Nelson, delivered for Nelson City Council alongside Tonkin + Taylor.
Before a single bolt could go in, our rope access team manually cleared around 90m³ of material and vegetation from the face entirely by hand. With no machinery access and limited room to move, it was a significant undertaking.
From there, 30 rock bolts were drilled 6 metres into the slope, with all drilling carried out from a basket suspended by a 60 tonne crane to keep the work safe and accurate on a steep face. The bolts then anchored the steel detail and drainage system before 50m³ of steel reinforced shotcrete was applied over two days, working from a fixed man cage on a hiab truck.
Black oxide was added to the mix to help the finished surface sit naturally within the environment, an important detail on a landmark like Botanical Hill.
We're really happy with how this one came together, and looking forward to more work with NCC and Tonkin + Taylor down the track.
Dodson Valley / Scotia St Waterways - Nelson
Dodson Valley / Scotia St Waterways - Nelson
Client : Nelson City Council
Head Contractor : Kūmānu
Ground Anchor Systems has been engaged by Kūmānu and Nelson City Council to complete three stream bed upgrade projects across Nelson this year. Dodson Valley and Scotia Street have been completed already with Alton Street scheduled for the end of the year.
Each site has its own challenges and varied ground conditions. Both permeated and temporary 600mm casing was used to mitigate collapsing waterlogged ground and allow for the timber poles to be installed. This was driven using our high torque drive unit.
The design includes both timber pole retaining walls and anchored shotcrete acting as scouring protection during flood events.
These projects have been completed in tight time frames and weather windows to reduce the time in the streambeds and minimise the environmental impact and disruption to local residents.
Maitai Valley - Nelson
Maitai Valley - Nelson
Client : Nelson City Council
Work is progressing well in Maitai Valley for Nelson City Council, where our team is installing 30 rock bolts embedded 6‑metres into the slope to stabilise the hillside.
To complete the drilling safely and accurately, we’re operating from a drill basket suspended by a 60‑tonne crane. Before drilling could begin, the crew manually removed approximately 90m³ of material and vegetation from the slope, a significant challenge given the limited access and the inability to bring machinery onto the face.
Our rope-access team has carried out all clearing work by hand, ensuring the site is prepared to the highest standard.
Once the bolts are installed, they will anchor 180m² of shotcrete, scheduled to be applied as part of the long‑term stabilisation solution.