SCREW-IN ANCHOR WITH CONTROLLED PLASTIC DEFORMATION (VERSIONS) AND CONTROL METHOD OF FULL PLASTIC DEFORMATION OF CEMENTED SCREW-IN ANCHOR Russian patent published in 2009 - IPC E21D20/00 E21D21/00 F16B13/04 F16B35/00 

FIELD: mining engineering.

SUBSTANCE: invention relates to fixture elements. Screw-in anchor with controlled plastic deformation, containing elongate, tensile reference element, which interacts to at least one extruding element, and receiving element, able to receive elongate, tensile reference element and to hold extruding element. Elongate, tensile element passes beyond receiving element for length, which corresponds beforehand specified plastic deformation rate up to final fracture. According to the other version screw-in anchor allows also indicator for movement indication of receiving element relative to reference element. Control ability of plastic deformation of screw is provided by means of hollow formation in elongate, tensile element at movement for any length.

EFFECT: reliability growth of screw-in anchor operation, predictability increasing of its operation.

48 cl, 32 dwg