SCREW PILE Russian patent published in 2011 - IPC E02D5/56 

FIELD: construction.

SUBSTANCE: shaft fixed on surface of soil with nut is mounted from sections arranged of eight, ten, twelve, etc. of even number of equilateral triangles connected to each other by means of two lateral sides, at the same time sections are connected to each other by free third sides of triangles to form hollow helical shaft, along perimetre of which there are opposite four, five, six and more broken right and left helical lines to form inner four, five, six and more helical grooves, directed towards each other with identical pitch.

EFFECT: expansion of technological resources, increased rigidity and vibration stability in screw pile, including helical hollow shaft with cutting edges.

1 cl, 7 dwg