TAKATAKAHIA SLIP REPAIRS – COROMANDEL

DuraMesh™ MSE Soil Wall System

Contractor

Downer Paeroa

Engineer

Beca

Client

NZTA

Location

SH25a, Coromandel


james-dickinson

James Dickinson

Technical Sales

A large-scale storm event struck the Coromandel Peninsula late July 2017, leaving a trail of destruction in its wake. One location profoundly affected was SH25a where the Takatakahia stream embankment had suffered extensive scouring from rising water levels. The erosion significantly jeopardised the structural integrity of the state highway bridge above.

NZTA deemed this as a high-risk situation as further erosion of the bank would cause the bridge to fail. Traffic management was deployed immediately following the storm; the affected lane of the road remained closed until the completion of construction.

DESIGN

Cirtex worked closely with Downer and Beca to achieve the best possible outcome. Due to the critical nature of the site, our team was able to assist with identifying potential issues and suggest solutions, including the drainage of the exposed slope and length of the geogrid runs. It was essential to work quickly and transparently to ensure the products complied with the engineer’s design requirements, saving time and money during construction.

INSTALLATION

This slip repair was a very challenging project due to a very tight and problematic site. The speed of construction was a crucial factor requiring the need for the use of materials readily available. The DuraMesh™ solution presented saved the contractor weeks in downtime and related costs, mitigating the risk of the bridge failing.

During early stages of wall construction, technical staff met with Downer on-site to assist with installation procedures to ensure there were no delays to the construction program. Cirtex supplied specialist cutting equipment for the materials which safely increased the speed of installation. During the entire construction phase, the Downer team had access to technical staff to support when challenges and changes in design presented themselves.

The DuraMesh system provided the following benefits to the project:

  • Speed and ease of installation
  • Availability of product allowing fast and reliable supply.
  • Cost-effective solution
  • Aesthetically pleasing natural vegetated facing

Products used in this project

DuraMesh® – Reinforced Soil System

The DuraMesh system is a proven, engineered, reinforced soil system with a steel mesh facing for slopes up to 90°.

StrataGrid® – High Performance Polyester Soil Reinforcement Grid

StrataGrid is a high-performance soil reinforcement geogrid. It is manufactured from polyester yarns that have a high molecular weight and excellent tensile strength.

BioWool – Wool Matting

BioWool is a biodegradable wool matting for erosion and sediment control and landscaping applications. BioWool is ideal for protecting cut faces and exposed soil from erosion caused wind and water.

DuraForce™ AS Series Nonwoven Geotextile

DuraForce AS series geotextiles are manufactured and tested to exact quality standards and rated according to the NZTA F/7 specification for geotextiles. Available in a range of grades depending on the particular engineering application required.

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