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Sutton Quay - Lyttelton - retaining wall repairs

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Repairs to the earthquake damaged heritage retaining wall
Sutton Quay, Lyttelton
From August until December

Where we are working

Map. Sourced from LINZ data, Crown Copyright reserved. Work area (red): part of the southwestern side of Sutton Quay (near the intersection with Norwich Quay).

How we will fix the wall

  • A ramp has been installed to sit the drill rig on.
  • Stonemasons will deconstruct the heritage parapet wall.
  • Soil nails will be installed. This involves drilling and grouting a series of fibreglass bars into the soil or rock behind the retaining wall. The nails help strengthen the wall.
  • Dual layers of shotcrete will be applied. Shotcrete is a mixture of cement, aggregate, and water conveyed by compressed air to a spray gun.
  • Stonemasons will rebuild the heritage parapet wall.

How we install soil nails

  1. A drill rig will drill a hole into the soil behind the wall:
    Soil behind the retaining wall.
  2. The soil nail will be installed in the drilled hole and grouted:
    The nail is secured in place with grout, from a grout mixer and pump.
  3. After the grout has cured, the soil nail can be tested:

The ramp below the heritage retaining wall to install the top row of anchors:
Photograph of ramp.

Heritage parapet wall to be carefully deconstructed and rebuilt with the help of stonemasons:
Photograph of heritage parapet wall.

Photographs from similar work

A drill rig:
Photograph of drill rig.

Anchors and shotcrete:
Photograph of wall with protruding anchors.

Shotcrete surface:
Photograph of wall surface.

Need more information?

Call Fulton Hogan on:
0800 277 34 34 (8.30am–5.00pm Monday–Friday)
Email Fulton Hogan:
[email protected]
Visit the SCIRT website:

Start date: 
Mon, 15/08/2016
Project numbers: