SCREW PILE AND PILE CONSTRUCTION METHOD Russian patent published in 2006 - IPC E02D5/30 E02D5/56 

FIELD: building, particularly piles for foundation building.

SUBSTANCE: screw pile for soft ground comprises hollow shaft with helical extensions formed on outer shaft surface and extending at α angle to vertical line. The extensions are made of steel strip. The shaft is provided with connection pipes to supply filler in space between pile shaft and extensions to impart ellipsoid shape to the extensions. Tangent of α angle is equal to 0.15 - 0.70. Method of pile forming in soft ground involves producing hollow pile shaft with helical extensions; driving pile for predetermined design depth and imparting ellipsoid shape to the extensions after pile driving in ground by supplying filler in spaces between shaft and extensions; filling hollow pipe shaft with concrete.

EFFECT: increased load-bearing capacity and reduced labor inputs for pile production.

2 cl, 3 dwg