Earth Stability

Case Studies

Project:  Huia Aqueduct

Date:  April 2017

Client:  Watercare

This project was awarded to ESL following approach by, and direct negotiation with, the client.  The project consisted of emergency works to repair a slip that had formed under part of the Huia Aqueduct at Woodlands Park Road.  The slip was threatening the stability of the Aqueduct and approximately 20% of Auckland’s water supply.  Works were therefore urgent and critical.

This site was extremely restricted in its access, resulting in ESL helicoptering in materials in a seamlessly timed operation whereby materials were shuttled in, in 8 minute windows, resulting in a significant cost caving to the client.

The project required ESL to install 8 drilled and grouted double corrosion protected tie-back ground anchors connected to 4 pre-fabricated steel waling beams to support the newly exposed piles of the retaining wall that run along the underside of the approx. 2-metre wide Huia Aqueduct.

Temporary works consisted of:

  • the construction of pre-fabricated timber decks either side of the aqueduct for the storage and mobilising of materials; and
  • 12 No. Platipus S8 percussion anchors, which were installed in pairs, tested to 1.5 tonne each and strapped to Aqueduct for temporary support.

Work was completed on time and under budget and with full client satisfaction

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Drilling of Anchors

Drilling of Anchors

Drilling of Anchors 2

Drilling of Anchors 2

Loading Materials

Loading Materials

Materials Landing Site

Materials Landing Site

Mobilising Materials to Site

Mobilising Materials to Site

Temporary Support of Existing Structure

Temporary Support of Existing Structure