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

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Stoner Hill, Petersfield – UK

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Project Overview

Dry weather followed by heavy rainfall resulted in shrinkage and cracking of the ground below the C18 carriageway at Stoner Hill. A landslip collapsed a third of the road which was originally carved into the Hampshire hillside in 1827. Cutting off a vital connection between villages and towns, and impacting small businesses. As an environmentally sensitive location and Site of Special Scientific Interest (SSSI), negotiation and close work between contractors, councils, and Natural England (formally English Nature) was required. Considerable repair work was required, including a sheet piled wall to retain the carriageway. To minimise the pile depth, permanent anchors were required to provide a horizontal prop force.

Solution

Following extensive site tests, B8 aluminium bronze anchors, fitted with stainless steel threaded bar and accessories were specified, providing a permanent 120 year design life. These were installed horizontally across the line of the excavated carriage way onto the chalk of the hillside. Once the anchors were loadlocked and proof-tested, the stainless steel bars were extended to reach the sheet pile wall and attached using stainless steel loadplates and loadnuts.

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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