Case Study Underpinning a Leaning Wall in Hull: 84 Screw Piles in Two Phases ApplicationUnderpinning LocationHull, United Kingdom Piles84 pcs, helical Ø76.1 mm double helix Pile length4 m StructureLeaning boundary wall At Beverley Leisure Centre in Hull, UKHelix used Finnish-made helical piles to underpin a large wall that had very little footing and was starting to lean. The fix was 84 piles, a 76R double-helix design taken down to 4 metres, installed in two phases. The first phase stabilised the wall before the underpinning continued, with large brick stanchions to follow. The piles were installed right against the brickwork, in excavated pits along the base of the wall, to carry its load down to firmer ground. In the second phase UKHelix added a further 40 piles. The torque comfortably exceeded what the project called for, and the work was finished on schedule, leaving the leaning wall carried on a solid screw pile foundation. Project photos Click to enlarge. All case studies