PRECAST PILE Russian patent published in 2016 - IPC E02D5/56 

FIELD: construction.

SUBSTANCE: invention relates to construction, namely to foundation construction. Precast pile includes screw shaft, that is made along perimeter in form of hollow conical helical surface, made of strips of curved shape of different order and degree of curvature with centers, located inside cross section of hollow conical helical surface with formation along its perimeter of multi-thread screw surfaces of concave shape with helical lines and helical grooves outside of helical surface with different width of strips with length of conical helical surface. Strips are coiled in vertical plane in lengthwise direction and bent in helical lines in transverse direction on mandrel in form of paraboloid of revolution. At that, outside helical surface along outer perimeter are formed by screw together along whole length of screw shaft.

EFFECT: technical result is facilitating of shaft immersion in soil, simplified manufacturing and expansion of technological capabilities.

1 cl, 7 dwg