New tech­nol­ogy could halve costs

The Northland Age - - Local News -

The Far North Dis­trict Coun­cil be­lieves that a con­struc­tion method now be­ing used to sta­bilise a sig­nif­i­cant slip on West Coast Rd, in the North Hokianga, could halve the cost of sim­i­lar re­pairs.

In­stead of building a con­ven­tional re­tain­ing wall, wire mesh was be­ing used to re­tain a hill­side near the junc­tion with Mo­tuti Rd.

Gen­eral man­ager in­fra­struc­ture and as­set man­age­ment Andy Finch said the mesh was held in place by a se­ries of steel an­chors driven deep into the bank us­ing spe­cialised ma­chin­ery.

Mr Finch said the coun­cil was al­ways open to ex­plor­ing in­no­va­tive and cost-ef­fec­tive meth­ods of main­tain­ing the dis­trict’s ex­ten­sive road network, and this tech­nique had real prom­ise.

“Our ge­ol­ogy makes us par­tic­u­larly vul­ner­a­ble to slips, and these can be ex­pen­sive and time-consuming to repair,” he said.

“This tech­nique can sig­nif­i­cantly re­duce the time re­quired to com­plete re­pairs, and also uses fewer ma­te­ri­als.

“That means costs can potentiall­y be re­duced by as much as half, while achiev­ing sim­i­lar lev­els of sta­bil­ity as tra­di­tional re­tain­ing meth­ods,” he said.

This was the first time the ma­chin­ery re­quired for the mesh and an­chor tech­nique had been avail­able in the Far North, and the coun­cil hoped to be of­fered the op­tion again by con­trac­tors ten­der­ing for slip re­pairs in the fu­ture.

A sim­i­lar con­tract to repair a slip on Broad­wood Rd, near the Manga­muka junc­tion had been awarded, with work due to be­gin later this month.


A slip on West Coast Rd, North Hokianga, has been sta­bilised us­ing the mesh and an­chor tech­nique.

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