DRIVEN PILE Russian patent published in 2011 - IPC E02D5/48 

FIELD: construction.

SUBSTANCE: helical shaft is made of serially arranged sections, every of which is mounted from two pairs of triangles joined by lateral sides, at the same time the first pair is made of two identical pairs of isosceles triangles, and the second pair is made of an isosceles triangle equal to the isosceles triangle of the first pair and an equilateral triangle, sides of which are equal to a lateral side of the isosceles triangle, besides, each subsequent section is turned in respect of the next one by 120°.

EFFECT: expansion of functional capabilities.

1 cl, 5 dwg