SCREW PILE Russian patent published in 2004 - IPC

FIELD: building, particularly foundation building. SUBSTANCE: screw pile comprises screw hollow shell formed of strips and having cutting edges. Hollow shell is fixed by nut on soil surface. Strips are alternately bent in opposite directions at an angle of 140 deg. along cuts extending at an angle of 60 deg. one to another and to strip longitudinal edges so that equilateral triangles are formed. Equilateral triangles are alternately directed in opposite directions. Strips are connected one to another along longitudinal edges thereof at an angle of 70 deg. so that three broken screw lines - stiffening ribs are created along guide perimeters. Junction points of four equilateral triangles are located in screw lines breakpoints. EFFECT: simplified pile production, increased pile rigidity and vibrostability. 10 dwg