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

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Hastings and St Leonards, East Sussex – UK

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Project Overview

The project involved providing a retaining wall anchoring solution for a private residential property located on Millward Road in Hastings. Both the property and the back garden required refurbishment, including structural changes, designed by structural engineers Price & Myers. The back garden comprised a series of varying ground levels separated by retaining walls, some of which were structurally unsound. To address this issue, the proposed solution was to install Platipus Percussion Driven Earth Anchors (PDEA®) to effectively reinforce and stabilise the retaining walls. Access to the site from the front of the property was significantly limited, posing logistical challenges.

Solution

Following suitability testing, the Indemnified Design specified the installation of Platipus B4 Anchors driven to 7m depths for the upper retaining wall and 6m for the lower. The site’s unique topography, characterised by a steep west-facing slope, resulted in a 7.3m elevation change from the front to the rear of the property, with an overall slope angle around 15°. To accommodate this elevation change, the rear garden was terraced into three distinct levels, supported by retaining walls ranging from 0.9m to 2.0m in height. The uppermost terrace was at the same elevation as the adjacent St Mary’s Terrace carriageway to the east. Overcoming limited access constraints was achieved using a BROKK machine. Its compact size and manoeuvrability allowed it to navigate through tight spaces, effectively installing the permanent Platipus ground anchors. By using the Platipus solution to remediate the wall, just 1.5 tonnes of Embodied Carbon was emitted, providing an overall saving of 15.8 tonnes or 91% Embodied Carbon compared to reconstructing a new concrete retaining wall.

The old deck was demolished and a degree of stabilisation was required for the abutments once the new deck was in position

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