FIELD: construction.
SUBSTANCE: pile foundation consists of a field of screwed-in screw-blade piles, each of which consists of a steel tubular tip with screw-blade winding of blade ascending under a cone in an upward direction with maximum diameter Dmax on an upper end. The pile tip is attached throughout the height with sections of hollow pipes, on the upper end of the column of which there mounted is a foundation frame after the cavity of the pipe column is filled with cement mortar or concrete. A screw blade has a semi-spherical support surface, the angle of semi-contact of which to soil is an angle of soil internal friction in a disturbed state φk=φH. Diameter Dmax of the pile is chosen based on the carrying capacity of soil, the value of initial (the first) critical load for which is assumed based on the specified mathematical relationship, and the pile is screwed into soil to depth h≤cbuilding/γbuilding, where γbuilding - specific soil weight.
EFFECT: increasing carrying capacity of a pile and stability of a pile foundation.
2 cl, 3 dwg, 1 tbl
