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Rockfall Protection - Hanmer Drape 2017

Looking South - DELTAX® G80/3 drape - note low visibility and rasied top rope

Rockfall Protection - Hanmer Drape 2017

Looking South - DELTAX® G80/3 drape - tourist traffic and no catchment

Rockfall Protection - Hanmer Drape 2017

Looking South - DELTAX® G80/3 drape - Logging route

Rockfall Protection - Hanmer Drape 2017

Turn buckles to tension and loosen bottom rope

 
 

System length

240 m

 

Year of installation

2017

Initial situation

A steep 70-80°, 240 m long road cutting with limited to no catchment at the base was experiencing an increased rockfall frequency after the 2016 M7.8 Kaikoura earthquake. The state highway is the main access road to the popular touristic hot springs and an important haulage route for logging trucks. Just like most of New Zealand sites, the solution had to have a low visual impact.

Description

The high tensile DELTAX® drape was selected due to its low visibility, high uniform strength to resist dynamic puncturing and fast installation to minimise traffic disruption. The drape utilises a raised top rope to intercept any minor rockfall from above and a bottom rope due to a limited catchment at the base of the cutting. For easier system maintenance turn buckles were installed on the bottom rope so it can be quickly loosened and tensioned.

Customer

NCTIR

Contractor

Geovert

Protected object

Road

Corrosion protection

GEOBRUGG ULTRACOATING

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Kevin H. Coyle
 

Kevin H. Coyle

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Hydraulic Engineering
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Saleh Feidi

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