ROPE BOLT Russian patent published in 2017 - IPC E21D21/00 

FIELD: mining engineering.

SUBSTANCE: there is conical screw installed as the head of the rope anchor at a distance of l=5-10 mm from the end of the rope. The diameter of its base d_scr is determined based on the expression of d_scr=0.8d_hol, where d_hol is the diameter of the hole. The coupling on the outer surface has a thread and a nut for tightening the rope. At the end of the coupling there is a hexagonal surface with a cylindrical shank of width l₁=5-10 mm and a radius inscribed in the regular hexagon. Inside the coupling thee is a channel for passing and fastening the rope, which follows the shape of a clamping wedge piece, in which there is a deformation slot and a channel for passing strands of the load-bearing portion of the rope, having a conical shape that transforms into a cylindrical one. To securely fix the clamping wedge piece, its length L_w is taken depending on the diameter of the clamped rope load-bearing portion d_cl and calculated by the formula L_w=(11÷13) d_cl. The length of the conical part of the wedge piece L_cw is taken based on the expression L_cw=(0.5÷0.7) L_w. The angle of the conical surface slope is in the range α=2.5÷3.5°. The width of the deformation slot l_w depends on the diameter of the clamped load-bearing portion of the rope and is in the range l_w=1.3÷2.0 mm.

EFFECT: increasing the manufacturability and installation ability, and the structural reliability of the rope bolt and the efficiency of its anchoring in the hole.

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