DEVICE FOR ERECTION OF BORED SCREW PILES Russian patent published in 2012 - IPC E02D5/56 

FIELD: construction.

SUBSTANCE: device for erection of bored screw piles consists of a body, the upper part of which is made in the form of a hollow polyhedral nipple with a hole for a lock finger, and a rock cutting tool with a skirt. The middle and the lower parts of the body are made in the form of solid cylinders with a cross section of various diameter, besides, the middle part has larger diameter, and the lower part is of smaller diameter. In the middle cylindrical part there is a system of holes, a cavity to inject a concrete mix and a transverse slot, in which on a vertical axis placed in the vertical hole of the body, there is a slot-forming knife mounted with the possibility of rotation, the rear and front faces of the working part of which are formed by crossing of two cylindrical surfaces of various radius, axes of which are parallel to the axis of the device and lie in a single plane, and the axis of the cylindrical surface forming a rear face of the slot-forming knife matches the device axis, at the same time the lower and the upper ends are made with radial flat faces. The slot-forming knife is installed with the possibility to interact with a spring-loaded pusher to extend the slot-forming knife into a working position, and in the lower cylindrical part of the body there is a through longitudinal slot with a limiter arranged in it.

EFFECT: increased efficiency in erection of bored screw piles and their bearing capacity and stable and medium-stable soils, reduced material intensity of boring works.

7 cl, 5 dwg