Abstract: The present invention relates to the manufacture of a concrete pillar, cast on site, in difficult grounds, not allowing the use of traditional equipment.A rotating column equipped with nozzles at its lower end and having a reduced diameter as compared with the pillar to be built, sends, as it penetrates the ground, a powerful pressurized fluid jet; in this way a wide cavity is formed, which is filled during the same excavation with selected aggregates; finally a binding mixture is injected as the excavating tool is extracted.
Abstract: The invention is related to a process according to which at the end of reinforcement bars inserted in a pile a nearly cylindrical and elongated chamber is inserted in the ground, said chamber having rigid impervious walls as to the fluids tending to enter from the outside, while when injecting cement grout into said chamber through appropriate tubes, the side walls will break and allow for grout expansion into the ground. The injection operation can be repeated for several times after as many scavengings or washings of the chamber.
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