Foundation Specialists

Continuous Flight Auger Piles

Continuous Flight Auger (CFA) Piles are built by drilling a hollow-stem auger into the ground to form the pile’s diameter and a concrete pump is utilised to deliver concrete through the hollow auger stem to the pile.

Pile diameters range from 300mm to 1.2 m.
Piling Lengths range to 35 m.
Rig weights range from 11t to 160t.

Applications

CFA Piles can be installed quickly and inexpensively without significant vibration or excessive noise being produced. They are ideally suited for most soil types. Avopiling’s own design of drilling tools is capable of drilling into certain rock layers. Once desired pile level is achieved sand-cement grout or special concrete mix is then pumped into the hole through the hollow stem of the auger while being extracted, eliminating the need for temporary casing and making them ideal for non-cohesive or water bearing soils.

CFA System is ideal for foundation piles and for embedded retaining walls such as contiguous and secant piled walls. 

Advantages

  • Low noise and vibration
  • Works well in non-cohesive soils
  • Cost-effective
  • Minimal site preparation
  • Suitable for tension loads
  • Can be installed successfully into most ground conditions
  • Ideal for foundation and piled earth retaining systems

Otto Rosebery, 26-56 Rothschild Avenue

  • Otto Rosebery CSM and CFA systems
  • Mixing soil adjacent to sheetpiles
  • Lowering of steel column after soil mixing
  • Combination of UB columns and CFA piles

Project Outline

OTTO Rosebery is a residential building project comprising of 4 apartment buildings ranging from 3 to 7 storeys with 2 basement parkings. Brown is the nominated Structural Consultant and ICON Construction Group is the nominated construction company to undertake civil and building construction works.

 

 

Scope of Works

Avopiling was tasked to design and construct CSM walls and exterior/interior CFA Piles The project is programmed in two stages. Stage 2 is noted to be difficult due to existing concrete piles needed to be avoided during actual construction.

 

Stage 1 is made up 188 CFA piles with varyiing sizes 450Ø, 600Ø and 750Ø to a maximum depth of 17 metres using 40 to 60 mpa concrete and 97 CSM wall panels with a dimension of 640mm X 2800mm reaching depths of 13 metres. Three wall sections were anchored to a total of 84 anchors and one wall section is cantilevered with only a 9mm inclonometer deflection. CSM walls consisit of 4 external and 2 internal panels. CSM walls are reinforced with 2-3 of 310UB40 steel beams. The walls were able to achieved 8-12 Mpa strength.

 

Stage 2 is made up of a combination of 88 panels CSM wall and CFA piles, wall panels to 8.5 metres deep and 163 nos. of CFA piles with various diametres to depths of 12.6 metres.

Penrith Goverment Office Building

Project Outline

The project entails the design and installation of secant pile wall made of 370No 600Ø CFA piles and 150No 125mmØ  temporary anchors.

Scope of Works

Avopiling undertook the rock anchoring on this project, the third row of anchors consist of 90 rock anchors to depths of 12.5 metres. 8.0 metres bonded into rock at an angle of ± 30º

Royal Shore Ermington

Project Outline

Royal Shores Ermington is a residential development project comprising of Lots 301-302, 303-304, 305 and 306. These lots will house medium rise buildings with two basement car parks. The sites are situated next to the Parramatta River and required 6.00 meters of excavation to create the basement structures.

Scope of Works

Avopiling was awarded the contract by Dasco Australia to design and construct the foundation piles and install sheet piles. Sheetpiles are double AZ20-700 to lengths ranging from 12 to 25 metres and with a total area of 15,000 square meters. 

Foundation piles are mostly drilled displacement piles ranging from 450mmØ to 610mmØ to depths of 16.00 to 25.00 metres. CFA Piles 750mmØ and 900mmØ to depths of 22.00 meters and UC steel columns with lengths from 18 to 21 meters were also installed as part of the foundation piles.

Drilled displacement piles on crtical sections were subjected to PDA test and showed positive results. 

Project examples

Otto Rosebery, 26-56 Rothschild Avenue

Otto Rosebery, 26-56 Rothschild Avenue

NSW

OTTO Rosebery is a residential building project comprising of 4 apartment buildings ranging from 3 to 7 storeys with 2 basement parkings. Brown is the nominated...

Project examples

Penrith Goverment Office Building

Penrith Goverment Office Building

NSW

The project entails the design and installation of secant pile wall made of 370No 600Ø CFA piles and 150No 125mmØ  temporary anchors.

Project examples

Royal Shore Ermington

Royal Shore Ermington

NSW

Royal Shores Ermington is a residential development project comprising of Lots 301-302, 303-304, 305 and 306. These lots will house medium rise buildings with two basement...

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Our clients

  • Roads & Maritime
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  • Transport for NSW
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