Concrete secant piles were installed, primarily in clay soil conditions, around the perimeter of this development to form a basement and swimming pool area. The job required the installation of 318 No x Ø420mm piles to depths between 8 and 12m, with a maximum retained height of 8m. The ABI ‘VDW’ system (Vor Der Wand or Front of Wall) offers a low noise, low vibration method of constructing a load bearing retaining wall with practically zero boundary wall clearance. With the continuous flight auger rotating inside the counter rotating casing (fitted with a cutting shoe) the VDW system drills quickly and very accurately in close proximity to existing structures, often cutting through buried brick walls or old footings in the p

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