Foundation Specialists

Drilled Displacement Piles

Drlled displacement piles are a ground improvement system. DDP’s are displacement elements that are installed using a specially designed tool at the working end of a high torque drilling machine. 

Diameters range from 300mm to 610mm.
Rig weights from 50 to 160 tonnes.
Depths up to 32 metres.

Applications

The DDP’s are well adapted to high surface loading conditions and strict settlement requirements and are used to support slabs-on-grade, isolated footings and embankments. The DDP technology is very well suited for very soft soil conditions such as organic clays, alluvial deposits and wastes.

DDP’s can also be used to directly support the loads imposed by the structure and to improve the global response of the soil in order to control settlement. The dimensions, spacing, and composition of the DDP’s are based upon the development of an optimal combination of support from the columns and the surrounding soil to limit settlement for the project within the allowable range and to obtain the required value for the equivalent composite deformation modulus of the improved soil. With the assistance of on board computers, the piles are built to a high level of quality.

Advantages

  • Increases the strength properties and modulus of the soil.
  • Displaces soil laterally, with only 5-10% spoil, thus excellent method for contaminated soil.
  • Reduces vibration and minimizes disturbance of the surface layer.

HW30 Central Coast Highway

  • HW30 Central Coast Highway Ground Improvment
    Ground Improvement - Drilled Displacement Piles

Project Outline

Central Coast Highway / Manns Road / Brisbane Water Drive Intersections and Approaches Upgrade at West Gosford. Main construction of roadworks, bridgeworks and associated activities for the upgrade and involves the widening and realignment of Brisbane Water Drive and Manns Road between Kulara Avenue in the south and Stockyard Place in the north to form a single at-grade fully signalised intersection with the Central Coast Highway.

Scope of Works

Ground improvement of the Central Coast Highway between Erina Heights and Wamberal, 572No Drilled Displacement Piles 450mm dia; column depth from 5.0 to 14.1m; grid spacing: varies from 1.2 to 2.0m.

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. 

23 Bennelong Parkway Wentworth Point

  • Avopiling Bauer MC64 with HDSG50
  • One The Waterfront construction site
  • Avopiling's MC64s in operation
  • Avopiling HS 8100s at work

Project Outline

The site is on a 25,000 square meter property to accommodate 5 residential / commercial buildings. The development of the site named "One The Waterfront" shall be undertaken by Piety THP Development.

Scope of Works

Piety THP engaged Avopiling to design and construct the diaphragm perimeter wall and the foundation piles of the buildings. The diaphragm wall system shall be 800mm wide to depths of 20.00 meters. Foundation piles are to be made of 600mmØ DDP drilled displacement piles, 450mm, 900mmØ and 1050mmØ CFA Piles all to depths of 21.00 meters. 

Project examples

HW30 Central Coast Highway

HW30 Central Coast Highway

NSW

Central Coast Highway / Manns Road / Brisbane Water Drive Intersections and Approaches Upgrade at West Gosford. Main construction of roadworks, bridgeworks and associated...

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...

Project examples

23 Bennelong Parkway Wentworth Point

23 Bennelong Parkway Wentworth Point

NSW

The site is on a 25,000 square meter property to accommodate 5 residential / commercial buildings. The development of the site named "One The Waterfront" shall be...

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