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Novel approach to rock clearance on Northland state highway

18 December 2019

Waka Kotahi NZ Transport Agency’s Northland team has taken an novel approach to road maintenance, using a milling machine to clear hazardous material off rock faces in the Brynderwyns Hills on State Highway 1.

Northland System Manager, Jacqui Hori-Hoult, says the resilience of this stretch of road during bad weather is a year-round problem, but the road maintenance team has taken an innovative approach to tackling the risk of rock falls.

“The problem was how to clear away loose and unstable rock that could easily be dislodged off the rock face by weather events. The risk is that it falls on to passing vehicles or even causes a slip that blocks the road and stops traffic, which we have experienced on SH11 Lemons Hill.”


cid:image001.png@01D5B412.94FCE3B0 “Usual practice would be to sluice the loose material off with water or send an abseiler down the rock face to knock it down, but both methods have health and safety and environmental issues. To reduce these, our contractors suggested putting a milling machine on the end of a long-reach digger.”

“That required some adjustment to the hydraulics on the arm, but they tried it out in a quarry, and it worked pretty well.”

“So, we used it this month for the first time on two 20 metre sections of SH1 on the south side of the Brynderwyn Hills. While we monitor and carry out regular preventative work this innovative solution will help to minimise the safety risk from rock frittering and may reduce our maintenance.”

“Heavy duty milling machines are used in new road construction, but we think this is the first time a lightweight milling machine has been used in this way for maintenance. It was quick, safe and cost effective and we’ll likely use it again.”

The milling operation took place over two nights at two sites with stop/go traffic management in place to keep both the maintenance team and road users safe.

We thank drivers for their patience during this work.

ends

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