Griffiths Civil Build Projects

Earthquake Strengthening - Royal NZ Police College

This building upgrade to the Barry Mason building was one of the first of its kind performed in New Zealand.  The Pile Desired Loads had to be achieved with the minimal number possible within testing and adverse conditions. 


Project scope

This was a balancing act by the engineers in term of achieving the required Pile Designed Loads verses the minimal number of piles required to successfully achieve the desired results. Piles were designed to achieve loads of –7166kN Compression and 3349kN Tensile, this building upgrade was one of the first in New Zealand to such specifications.


Complicating factors and solutions

There were a number of factors that made this project practically challenging.

For starters, there was drilling 400mm diameter piles up to 8 metres deep inside the building, with only 3.3m of head room. Combine that with harder than expected rock and ground water, along with pile cages containing 8x HD 40 bars that had to be installed in sections. Then to make things even harder, all the work could only be done at night and over the weekends, so the College could remain open and operating as usual during the day.

To overcome the harder than expected rock we needed to use a combination of methods, firstly break up the rock using percussion drilling, then auger within the limited space using our mini rig, this was followed by vacuum excavation to clear the watery paste left behind.

Next came the installation of the steel pile cages which came in 2m - 4m sections hoisted through a small hole in the ceiling by electric wench. They were then lowered into position where they were supported before the next section was lifted and lowered on top and welded together before lowering the completed pile into place. This time intensive process was then repeated on every hole.

The majority of the ground water was pumped out prior to the concrete going in, this was then tremied (pumped to the base of pile) to displace any remaining water which could then be sucked off the surface as the concrete came up to prevent any flooding inside the building.

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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.

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.

Soil Nail Wall - Dowse to Petone

Construction of a retaining wall that included drilling and testing a sacrificial nail for design purposes, drilling and installing production nails, fabrication of nail heads, fixing mesh to the face and applying sprayed concrete.