Griffiths Civil Build Projects

Soil Nail Wall - Dowse to Petone

Fletcher Higgins Joint Venture 2008

Part of the Dowse to Petone Project involved building a new service road at the rear of the buildings that were accessed directly off State Highway 2. The new service road cut into the toe of the hill and required a large retaining wall to be constructed.


Project scope

Griffiths were tasked with constructing the wall from start to finish. Construction of the wall included drilling and testing a sacrificial nail for design purposes, drilling and installing production nails of various lengths, fabrication of nail heads, fixing mesh to the rock face and applying sprayed concrete to the wall.

Due to the unstable nature of the rock locally, a blinding spray was required around the area of the test nail to give a firm and regular surface to place the jacking plate against for the testing of the sacrificial nail. Once the testing was completed work on the production nails was able to commence.

The top rows were accessed by a large scaffold platform which was constructed after the blinding spray. The platform accommodated a portable drilling rig that was lifted into place. The scaffold level was lowered as the nail installation progressed.  The lower rows were drilled from the ground using a multi-angled rig. All holes were drilled with a down hole hammer.

Once the nails were grouted into place, the specially fabricated nail heads were installed and a heavy galvanized steel mesh covering the whole rock face, was attached.

After installation of the mesh and drainage holes, the whole wall was sprayed with 48 cubic metres of shotcrete.

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Projects

This section shows examples of some of the most recent and key projects that Griffiths Civil Build have been involved in. It showcases the variety of work that we are capable of and gives details of the individual projects, along with a scope and other relevant details and images.

Repiling, Decking & House Repairs - Grafton Rd

This project involved carrying out repairs to an existing dwelling in Roseneath that had restricted access. Our role was to undertake repair work as identified during a pre-purchase building inspection and engineers report.

Concrete Retaining Wall & Access Road - Homebush Road

This project on Homebush Road in Wellington involved the construction of a substantial precast concrete retaining wall and other works to create an access road for a new multi-lot residential development.

Timber Retaining Wall - Home in Roseneath

This home had an old concrete retaining wall that had failed and was falling over in places. After repairing a broken pipe (causing the soil to become saturated and contributing to the old wall failing) we constructed a new timber retaining wall.

Decks & Verandahs - Aotea College, Porirua

To keep the new music block build on track, Naylor Love Construction approached us to assist with the build. This project included securing foundations for relocated buildings, constructing large deck, access ramps and framing.

Earthquake Strengthening - Royal NZ Police College

A major project and the first of its kind in New Zealand. It was particularly challenging and had to be completed outside of usual office hours so the College could remain open. Limited space, harder than expected rock and ground water had to be overcome to successfully complete the job.

Retaining Walls - Commercial Projects

Griffiths Civil Build have a comprehensive background of successfully completing a wide range of retaining walls. See examples of our work that include an RBI upgrade for Vodafone, a new retaining wall on Paekakariki Hill Road and work in the city for Victoria University,

2 Degrees National Rollout - NZ Wide

Details of the national rollout for 2 Degrees. Tier 1 covered work in all the major centres, Tier 2 involved more remote locations that required helicopter and 4X4 access, while Tier 3 saw the completion of over 100 cell tower sites all over the country.

Telecom NZ Site Builds - North Island

Cell phone tower construction throughout the North Island. The ‘roadside' project in Palmerston North required an onsite traffic management policy, the construction at Avalon needed specialist environmental precautions and Otaki was the first to utilise Telecom's own specific design.

West Wind Farm

Limited access, steep terrain, wet slippery conditions and very high winds were complicating factors. Also the rock was very fractured due to the proximity of the main fault line.

Transpower Tower Foundation Strengthening

This project involved upgrading the foundations on transmission line towers in the upper South Island. We are proud to be associated with the 2007 New Zealand Engineering Excellence Awards Supreme Award winner.