METHOD FOR INSTALLATION OF PILE IN OVERFROZEN GROUND Russian patent published in 1995 - IPC

FIELD: construction of foundations under permafrost conditions. SUBSTANCE: method for installation of pile in overfrozen ground includes making hole, its filling with a part of loose material, installation with the aid of slip knot and hoisting mechanism of pile above hole coaxially with it and filling pockets between hole wall and pile surface with subsequent final driving of pile. Novelty consists in that prior to driving, pile end is clamped with disk of low-strength reinforced concrete, and pile is driven in two stages: first, it is driven to depth of 3d, where d is lateral size of head of pile smooth, part, and loose material is filled in volume of 0.5V, where V is pile volume, and, then, after driving of pile with disk up to contact with layer of previously filled loose material buffer layer, hammer is attached to pile head, striking part of hammer is lifted with the help of chain by hoisting mechanism to height L = H_drop+d_h,, where H_drop is height of dropping of hammer striking part, and d_h is diameter of hammer striking part and locked in this position, and, then, load lifting chain is lowered for value H_drop and slack is provided in chain, and hammer striking part is dropped to exclude dynamic loads on hoisting mechanism boom, and this operation is continued up to attaining preset pile driving resistance e (compaction of buffer layer loose material) with simultaneous breakage of disk of low-strength reinforced concrete. EFFECT: improved centering of pile in hole with simultaneous holding of loose material on it, and reduced labor input. 1 dwg