METHOD TO ERECT SCREW PILE IN SOIL Russian patent published in 2015 - IPC E02D5/56 

FIELD: construction.

SUBSTANCE: method to erect a screw pile in soil includes submersion of a screw pile for rated depth and formation of a pile support after submersion. The screw pile is previously made from a hollow shaft, for instance, a metal pipe or metal plastic material, and one end designed for submersion, is equipped with helical blades along outer surface, and in the lower part of the shaft they perform at least two holes perpendicular to its axis, and at least one hole at the base of the pile. The pile support is formed by supply of a soil strengthening mixture into the hollow shaft of the pile. Specified holes are previously made in the specified part of the pile shaft under the blade evenly along the spiral, the angle of twisting of which matches the angle of lower blade twisting. The soil strengthening mix is supplied into the cavity of the pile shaft simultaneously with submersion of the pile so that supply of the soil strengthening mix into the shaft results in its even mixing with soil along trajectory of passage of helical blades of the pile and binds soil upstream the hole and the blade, forming a support from soil in the lower end of the pile shaft, so that the support covers blades and pile shaft in a volumetric manner.

EFFECT: increased reliability of a helical pile in soil in process of its operation, increased bearing capacity and resistance to various external differently directed force and pulse actions.

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