Drilling in Christchurch

Twice in the last two years, we were booked to come and stabilize cliffs around Christchurch when another earthquake brought more damage and obliged to reassess the plans.

At last, we were called by a large local abseiling company, who has been granted the contract by Fulton Hogan despite no previous experience in drilling. At McCormick reservoirs in Sumner, the initial design, a self-drilling system, didn’t work for 2 weeks until I managed to convince everybody that an open hole strategy had to be deployed.

We’ve seen in Christchurch recovery other occurrences of drilling companies called on abseiling works and abseiling companies specialized in cleaning windows attempting geotechnical jobs. What a waste of time and ratepayer money…

Conclusion:  Always ask the experts and experienced first!

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Photos (c) DAS

Yearly safety improvement on SH6 for NZTA – Nevis Bluff near Queenstown

 In association with Downer Edi Works and Opus International, we have scaled and blasted 2 rock features from the  230m high face: Epsilon VI and the Lower West Column for a total amount of 35 cubic meters.
These features that are regularly monitored by Opus, were highly fractured and threatened the road and traffic below.

Epsilon VI direct access on rigging
    
Setting up one of the three blast wirings at Epsilon VI.                          Click to enlarge

After the rock removal, we have drilled, installed, grouted and tested 10 rocks bolts (between 4.5 and 9 meters deep) at 100 meters high  on the West column. 

Also for reinforcement purpose, we then carried out a complete installation of a mesh on the Lower West Column, in a very overhanging zone. The location of anchors is carefully chosen to make sure the mesh fits well.

Click to enlarge

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We want to thank the road users for their patience that allowed the State Highway 6 to be safer between Cromwell and Queenstown.