Retaining Walls, Soil Stability and Seismic Systems | New Zealand

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Retained Earth – Global Stability

Retained Earth™ specialises in retaining wall construction, repair and maintenance. We are an experienced geotechnical construction company that works within the residential & commercial building, mining and civil infrastructure markets.

Retained Earth™ work intimately with local and international suppliers, partners and clientele through our extensive, collaborative network, without losing touch with agreed expectations and standards.

Retained Earth™ assesses, and remedies, all earthquake-prone structures. Besides our expertise in retaining structures and products, we also offer seismic, strengthening rehabilitation, structural and architectural expansion joints, and other construction systems and components that are working on public bridges and high-specification venues such as hospitals and schools as well as residential housing units.

 

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CELL WALL product page

 

Retained Earth™ supply, install, repair or maintain;

  • mechanically stabilised earth (MSE) walls
  • reinforced earth walls
  • reinforced soil structures (RSS)
  • mass gravity walls such as gabion units or gravity blocks
  • concrete sleeper walls
  • cantilever retaining walls
  • segmental masonry block walls

As shown above, Retained Earth™ offers a comprehensive and diverse supply, install and maintenance package for Residential, Civil, Mining and Public Infrastructure Retaining Wall and Earth Stabilisation projects.

 

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See our expansion joint category search for further detail

REpairing Retaining Walls, Arches, Bridges and Homes| North and South Islands | New Zealand

Our REpair department serves to rectify common issues with ageing bridge & retaining wall structures, bridge expansion joints and deck seals, buried arches, culverts and pipes. And as the worlds’ infrastructure ages, there is an integral need for a company that can deal with the complexities surrounding remedial works on retaining structures, bridges, tunnels & water services on all scales, large or small.

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REpair of ageing civil and residential structures is something that separates us from other contractors.

The difference between the traditional geo-contractor and the operational capacity of retained earth is that we operate in both small-scale residential and large scale commercial. We are content in bringing superior levels of service across the board.

A bridge is just as important as your home. Therefore, we apply the same level of expertise across all projects — regardless of the size of the job or contract value.

We remedy critical failures such as overturning or sliding, rupture, cyclic fatigue, mechanical disturbance, water-ingress issues such as concrete cancer & scour (soil loss through weather/ water), subsidence, concrete panel structural or connection-point failure, general cleaning and maintenance including anti-graffiti treatments, acid sulfate reactivity, sealing and general surface treatments.

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REpair of civil structures is of utmost importance. retained earth have the know-how to complete technical remediation of existing structures.

retained earth are qualified to also carry out underpinning and rectification of structural defects through methods of remediation & prevention; extending intended design life and reinstating structural integrity to existing bridge abutments & components, grade separations, arches, culverts, and other systems of retention and slope stabilisation.

Expansion Joint Systems for New Zealand’s Seismic Building and Design Changes

By inherently factoring all aspects of the new seismic design and assessment criteria reflected in the Building (Earthquake-prone Buildings) Amendment Act 2016, which introduced major changes to the way earthquake-prone buildings are identified and managed under the Building Act 2004 throughout New Zealand, the joint systems Facade Interaction Joint utilises unique manufacturing and design to encapsulate and protect entire building facade envelopes from the effects of fire, wind and acoustics whilst compensating for thermal (low range) and seismic (high range) movement.

joint systems, in conjunction with some of the world’s leading architectural designers and product specialists, developed the Facade Interaction System specifically for the new changes to the Building Act (Amendment) in 2014 by adding a new level of acoustic performance to Preformed Polyurethane Expansion Joints. The Amendment in 2016 has been added after several years of strong seismic activity with the Public’s safety in mind.

The recent changes addresses New Zealand’s “Degrees of Seismicity” as they reflect three seismic risk areas or zones, and sets time frames for identifying and taking action to strengthen or to remove earthquake-prone buildings entirely.

Contact retained earth for further details on the retrofit and redesign of existing curtain walls and facade systems or for new build projects alike.

See more on the joint systems Facade Interaction System

The Advantages of the retained earth CellWall™ Gravity Retaining Wall System

The retained earth CellWall™ system is a mass-gravity type retaining wall array that is comprised of cast reinforced concrete units, formed to specific size and dimension, which are then combined by utilising our proprietary construction methods.

By controlling design, manufacturing and installation, retained earth focus the ‘bulk density’ approach to the retaining and stabilisation of slopes and embankments. Our system, in its unique composition, performs specifically for high deflection situations as required for sea walls, rail bridges and road-side retaining structures such as bridge abutments and grade separations.

The CellWall™ system is perfect for sites with soft soils, rock foundations and sites with limited access.

Walls such as crib walls and gabions (see pictures below), which also are designed and constructed utilising the mass-gravity method, perform very well in their functions but still allow scour to occur. The retained earth CellWall™ system, eliminates the risk of scour by adding density to our design block.

This simple solution reduces voids in the block and therefore is also very effective at controlling the establishment of vegetation in the face of the wall structure. This, when it occurs on similar mass-gravity structures, can cause further costs for private and public assets.

With no large root masses invading the wall structure, the CellWall™ system will outperform alternative gravity wall systems.

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Fix Faulty Expansion Joints | New Zealand | Joint Systems Expansion Joints

As a custom solution provider, joint system the expansion joint division of retained earth, through years of product development and project experience, can deliver retrofit expansion joint products for the repair and replacement of defective joint seals and sometimes as a result, dangerous situations for your patrons and employees.

Through cyclic fatigue, it is inevitable that the seals positioned in walls and floors will deteriorate, albeit, some quicker than others.

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Capable of high traffic loads, this cover plate solution was installed into the concourse level of a stadium structure. Equally as suited for car parks and private access bridges. Ask about our non-slip solutions.

Through our proficient procurement and product selection, combined with an OEM/ outsourced hybrid system capability, your building and your project will be better serviced on the whole as we are able to combine the best technology and products, combined in order to create the best functioning solution for your seismic or movement joints.

 

Being an ‘install-capable’ company, coupled with our in-house design, manufacture and supply capacities, our expansion joint service encapsulates all aspects. We can take you through the whole process, step by step. This ensures a highly efficient supply chain and business delivery mode.

 

Contact retained earth for further information on how we can assist you.

repair-expansion-joint-new-zealand (pdf download)