FIELD: construction.
SUBSTANCE: method for sinking screw piles into permafrost soil comprises drilling a pilot hole in the ground at the target depth, screwing a screw pile with one or more blades into it. The diametre of the pilot hole is drilled a few mm more than the actual maximum size of the pile shaft. All blades are rigidly connected to the pile shaft by one screw line. The lower blade is made of two rigidly connected single-turn parts: the first (incoming) part with a thickness T, with the blade diametre increasing from the bottom upwards according to a linear dependence to the value D, and the upper part with a thickness t less than T by several mm, manufactured with a constant blade diametre d less than D by several mm, the remaining blades are made with a thickness t and a blade diametre d. After sinking the screw pile to the target mark, a narrow space between the pile shaft and the borehole walls is filled with aggregate, followed by freezing to the temperature of the surrounding natural permafrost soil. In the process of screwing, the axial load on the pile is changed so that the magnitude of the soil friction on the blade is minimal.
EFFECT: ensuring the possibility of sinking screw piles by reducing the resistance of permafrost soils to their screwing, increasing the bearing capacity of the screw pile.
5 cl, 1 dwg
