PRECAST PILE AND METHOD OF ITS ARRANGEMENT Russian patent published in 2003 - IPC

FIELD: civil engineering, formation of pile foundations, predominantly in subsiding grounds of second type, in swelling and fill-up grounds. SUBSTANCE: precast pile aimed at installation in subsiding grounds of second type, in swelling and fill-up grounds includes shaft with expanded lower part. Novelty of approach consists in that upper part of shaft is guarded by separable enclosure with system for injection of antifriction material. External dimensions of enclosure are smaller than dimensions of expansion. EFFECT: enhanced stability of shaft in process of sinking, increased bearing capability of pile due to reduced negative friction. 3 cl, 4 dwg