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Posts Tagged ‘Design & Construction’

Retaining Wall Design: Component Quality is Important

Posted on: April 17th, 2015

Brookwater Crib Wall Project

When a designer issues a design certificate (a Form 15 in Queensland), the design is being certified against a specified criteria, for example AS 4678, Earth Retaining Structures code.

A core requirement of this code is design life; for residential retaining walls it is 60 years.

Warner Lakes Stone Strong Wall

Often overlooked is the supporting criteria that references specific codes. These codes cover the quality and manufacture of the components that make up a particular retaining wall system.

An example is our Concrib Concrete Sleeper Wall System consisting of reinforced concrete sleeper beams and either hot-dipped galvanized steel posts or reinforced concrete posts.

For this system we must ensure that the components are compliant with the relevant codes:

  • AS 3600 for Concrete Structures
  • AS 4678 for Hot-Dipped Galvanizing
  • AS 4100 for Fabricated Steel Structures, and
  • AS 1554 for Structural Steel Welding.

Engineered Concrete Sleeper Wall

Engineered Concrete Sleeper Wall

The certifying engineer should always ensure that the structural design complies with the code, as well as the chain of supply used to fabricate or manufacture the wall components.

Here at Concrib, we operate a Quality Management System compliant with ISO9001:2008. This ensures we can supply all relevant documentation regarding certificates for structural steel, concrete, galvanizing, reinforcement etc.

We are also a Queensland Department of Transport & Main Roads-approved pre-caster of retaining wall products.

This provides peace of mind for both the designer and end user in regards to the retaining wall complying with Australian Standards.

For further details of our due diligence in regard to retaining wall design, call Concrib on 1800 02 1800, email us at or simply contact us.

Retaining wall compliance: Absolutely no shortcuts

Posted on: July 25th, 2014

If engineered and built correctly, a retaining wall should last at least 100 years – and that’s why compliance is so critical.

Concrib are fully licensed with the Queensland Building and Construction Commission  (formerly BSA), and a member of Queensland Master Builders Association, the Civil Contractors’ Federation and The Urban Development Institute of Australia and are fully compliant with the National Code of Construction Practice.

We also have our products regularly tested by the University of Queensland (UQ) and the Qld University of Technology (QUT)

But that’s only part of the story.

Be they concrete, concrete masonry, reinforced concrete or steel, every engineered retaining wall must also comply with Australian Standards.

Concrib’s retaining walls are purposefully designed to do so, which is why our customers have come to rely on us.

With that in mind, we would like to detail precisely what is involved with compliance across all mediums, starting with the overall standard for Australian Retaining walls, AS4678.

This Standard takes into account a number of important issues such as whether a retaining wall fits its purpose, durability and design life.

It’s crucial – particularly in the long run – that no shortcuts be taken in their construction, otherwise they may be found out in the event of flood or if the structure succumbs to stress.

If ever it does, it may involve costly remediation, particularly if the problem has affected adjacent buildings and structures.

Now, let’s look at the other links in the chain, all of which need to comply.

AS 3600 Concrete Structures

Concrete Retaining Walls Stone Strong
This Standard sets out minimum requirements for the design and construction of concrete structures that contain reinforcement steel, or tendons, or both. Major points addressed in the standard relate to design methodology, durability, strength, climactic conditions and cover.

AS4100 Steel Structure

Retaining Walls Steel Structures
This Standard establishes the minimum requirements for the design, fabrication, erection and modification of steel in structures. Therefore the quality, strength and bar diameter is paramount. Equally important is the way the steel has been treated, for example zinc coating on fabricated ferrous (hot dipped galvanised steel) must comply with AS4680.

AS4680 Steel Reinforcing

Retaining Walls Steel Reinforcing
Important points covered in this standard relate to appropriate coating thickness and mass per unit area of zinc coating and coating adherence. These properties dictate the durability and design life of the galvanized steel article for particular applications.

AS3700 Masonry

Retaining Walls Segmental
This Standard sets out minimum requirements for the design and construction of masonry, including unreinforced, reinforced and pre-stressed, using manufactured units of clay, calcium silicate and concrete laid in mortar, autoclaved aerated concrete (AAC) laid in thin-bed mortar, and square- dressed natural stone laid in mortar.

Concrib is committed to upholding all of these standards.

For more information about these incomparable retaining wall solutions, please contact a member of our team ASAP on 1800 021 800 or simply click here.

Sweet Mango Hill sleeper retaining wall solution.

Posted on: November 18th, 2013

Concrete sleepers certainly saved the day for an interstate property developer recently at Mango Hill on Brisbane’s northside.

Fairmont Group, an Adelaide based company, had begun construction of a 107 lot residential subdivision here, with lots ranging in size from 300sqm to 2000sqm.

The development had been enhanced through careful design and construction, enabling many of the allotments to have serene views of the adjoining bushland and Freshwater Creek.

However, there were quite a few obstacles to overcome. For example, one of the key requirements for this project was to be able to present attractive, “ready to build“ flat blocks to the market.

To achieve this, Fairmont Group decided to cut and fill the site, thus requiring a sleeper retaining wall solution fit for this purpose.

Concrib sleeper walls to the rescue.

The completed sleeper retaining walls.

The Mango Hill development covered approximately 11 hectares and was ‘hill by name and by nature’ with a high degree of rise and fall across the site.

That’s when Concrib were engaged to provide a complete turnkey contract to design, construct and certify the retaining walls.

Mango Hill Property Development Steel Columns

In total, about 2800sqm of retaining wall was required, with 1900sqm being up to 3m, and 830sqm of very high walls varying from 3m to 4.6m.

The great advantage of sleeper walls is the relatively narrow area of land required – thus maximising the overall value of the development.

To provide maximum usable space for each property, Concrib decided the walls should be of vertical cantilever concrete sleeper wall design – incorporating steel columns as the vertical supports.

Many of these steel columns weighed up to 656kg!

Careful installation techniques were used throughout this project, including precise clamping and placement of the steel columns.

The result? A great looking, and well engineered retaining wall. Sweet!

At Concrib, we understand your project requires an experienced team and high quality products.

We have designed and installed a wide range of concrete retaining walls for civil and building contractors, government authorities, architects and consulting engineers.

To find the perfect retaining wall for your project, contact us or talk to a consultant today on (07) 3375 1800.  

Due diligence checklist

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