METHOD FOR CAST-IN-PLACE PILE ERECTION Russian patent published in 2008 - IPC E02D5/34 

FIELD: construction, particularly to erect piles in foundations in the case of insufficient borehole wall stability, particularly to construct foundations of buildings under construction and reconstruction.

SUBSTANCE: method involves drilling borehole; supplying hardening material in the borehole; compacting thereof by electric charge application along with upward exciting zone movement. Borehole is drilled by auger drilling assembly having electric discharge device connected to one end thereof so that it may move forwards. Hardening material is injected in well along auger drilling assembly ribs. As auger drilling assembly reaches borehole bottom the drilling assembly is lifted without rotation thereof in well for height equal to 0.8-1.5 well diameters. After created volume filling with continuously supplied material, discharge device is moved forwards and electric discharge is applied to material. After that auger drilling assembly lifting and electric charge supply operations are repeated up to borehole filling for the full borehole depth. As auger drilling assembly is lifted drilling assembly may be rotated in direction opposite to that of borehole drilling to fill space created after auger drilling assembly lifting with hardening material. Filling completion moment corresponds to time when borehole intake is stopped.

EFFECT: increased pile quality, load-bearing capacity and pile body material strength, simplified pile production.

2 cl, 1 dwg, 2 ex