Ground Sun designed, supplied and installed in excess of 50 piles for the new structures in this Horatio’s Garden project at Stanmore Orthopaedic Hospital.

Horatio’s Garden is a national charity creating and nurturing beautiful gardens in NHS spinal injury centres. The gardens provide a fully accessible space enabling spinal cord injury patients to spend time surrounded by natural elements.

The new structures consisted of 3 garden pods, a garden room and a gardeners area.

The garden is surrounded by protected trees in a root protection zone so the AB Chance helical screw piles system was ideal as it is a non-invasive, displacement piling system with no damage to tree roots. The geology is London Clay which is well known for its high plasticity which can make it susceptible to moisture movement – swelling or contraction – leading to heave or subsidence. Traditional trench foundations would therefore be difficult to build on as would be susceptible to movement.

The piles were installed over a 4 day period using a 5 tonne excavator. No piling mats required and no excavation spoil to remove. Up to 400kN ultimate capacity loads were required, A combination of SS5 and SS150 AB Chance helical piles were used. A 160mm sulphate resistant C30 grout column provided additional protection for the pile and means the screw piles are friction piles as well as end bearing.

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