METHOD FOR PRODUCING CAST-IN-PLACE PILES Russian patent published in 1995 - IPC

FIELD: civil engineering. SUBSTANCE: method involves drilling a cylindric well, its filling with electric conductance hardening material, creating high voltage electric discharges in the material by means of working expulsion-type discharger and its lifting along the well height. Well drilling and following withdrawal of the borehole tool is carried out so that the well wall stability is secured and slime layer is left in the lower part of the well. The discharger is set on the lime layer along the well axis direction before the electric conductance material having been supplied. The discharger is deepened into the slime layer down to the well bottom face concurrently carrying out high voltage discharges and wall surface condensation. The hardening electric conductance material is supplied into the well, starting at the moment the discharger reaches the well bottom face and continuing the material supply until the discharger is removed from the well. Discharge excitation is carried out in covering the discharger with the hardening material. EFFECT: enhanced strength satisfying requirements for constructing pile foundation. 2 cl, 9 dwg