Drilled piling uses down-the-hole hammers and drill bits to simultaneously install casing as the pile bore is drilled through the ground, with compressed air or water used to flush cuttings from the borehole. Where a pile is to be founded in bedrock, casing is advanced to the rockhead before the drilling tool is extended to create a rock socket. Concrete and reinforcement is installed in the completed borehole and casing is either removed or left in place to form the finished pile.
Van Elle have a unique offering providing cased piles including the rock socket in which the steel casing transfers the load and removes the need to concrete and reinforce the pile.
Van Elle offers a range of drilled piling methods, depending on ground conditions and foundation loads.
Its Hütte and Klemm rigs use a number of different down-the-hole tools (including Duplex and Odex systems and Elemex hammers) to form piles of up to 900mm in diameter to depths of XXm.