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These piles are usually 3 to 10 inches in diameter and can be pierced to midsts upwards of 200 feet. For the most typical kind of mini loading, a hollow steel or plastic shaft is either screwed or pierced right into the ground. Grout or concrete can then be poured in to create the stack, with the soil sustained throughout by the steel shaft. This suggests that, unlike the conventional boring technique, no additional assistances are needed, also in weak soil. piling contractors north west Screw stack setups have actually also reached residential applications, with several property owners choosing a screw stack over other alternatives.