Pioneering Percussion Driven Earth Anchors (PDEA®) for 40 Years


Cranbrook Road, Sydney – Australia

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Project Overview

The Cranbrook road location in Sydney was a private residence where Percussion Driven Earth Anchors (PDEA®) were used as part of a comprehensive temporary works solution to provide additional horizontal support for a 9m high concrete contiguous piled retaining wall.


Two upper levels of Platipus® B6 and B8 anchor systems were installed at a declined angle, increasing overburden  pressure on the anchor head, to depths of 8m into a dense sandy soil. This excellent granular material meant that the specified Design (Working) load requirements of 50kN and 80kN respectively were easily achieved. All 24no anchor systems were installed over a period of one month and the system provided complete construction flexibility by using an on-site excavator with mounted breaker and local operatives. Because of this, the anchor installation could be switched ‘on and off’ as required by the site program with no mobilisation / demobilisation of specialist equipment and resources. A waling system and anchor top termination was detailed and designed by the contractor providing a bespoke finish to the overall project.

Contiguous Pile Supports

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