PRECAST PILE Russian patent published in 2015 - IPC E02D5/56 

FIELD: construction.

SUBSTANCE: precast pile gas helical barrel diverging upward. Said barrel is composed of interconnected tip composed by isosceles triangles shaped to reversed right pyramid and case. The latter is made of three or more trapezoidal strips with different width and increased length. Loosened cross-section zones are milled or formed on said straps at 60 degrees to their axes. Said zones are shaped to undercuts with skewed walls to make over the case perimeter of circular polyhedral surfaces of alternating equilateral and isosceles triangles connected by their sides. Said strips are coiled in vertical plane across their lengthwise axis and flexed along helical lines at conical mandrel in transverse direction. These form three and more helical lines and helical surfaces of the main and opposite directions at variable pitch of helical lines.

EFFECT: easier piling and simplified production, enhanced process performances.

8 dwg