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Amplus computerised surveillance of the boring and concreting series causes the reliability and also uniformity of manufacturing More helpful hints making CFA piles amongst one of the most monitored and predictable foundation elements in operation. Bored stacks have a greater susceptibility to corrosion when their diameter is small. The bored stack was invented by the French designer Eugene Freyssinet in 1877. In France, Freyssinet's firm came to be the leader of the monotonous market in Europe, however he did not patent his invention.