DEVICE FOR FORMING HELICAL PROFILE ON WELL WALLS FOR BORED PILES Russian patent published in 2013 - IPC E02D5/16 

FIELD: construction.

SUBSTANCE: device for forming a helical profile on well walls for bored piles comprises a working tip made of sector boards, the upper end of which is hingedly fixed on the body, and the lower one is bent inside of the working tip, at the same time to the external sector boards, at the angle to the tip axis, there are conical profiles fixed, a vibrator of circular oscillations installed in the working tip, a mechanism of sector boards opening in the form of a ring rigidly fixed on the body of the vibrator, which is connected with a drive of reciprocal motion with the working tip body and a mechanism of working tip feed. The mechanism for feeding the working tip is made in the form of a rod, the lower end of which is hingedly, as capable of transferring rotation torque, is connected with the working tip body, and the stem comprises a drive of reciprocal motion, which moves it per single rotation to the value of helical profile stroke on the well wall.

EFFECT: higher speed of driving.

2 cl, 5 dwg