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 dscr is determined based on the expression of dscr=0.8dhol, where dhol 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 Lw is taken depending on the diameter of the clamped rope load-bearing portion dcl and calculated by the formula Lw=(11÷13) dcl. The length of the conical part of the wedge piece Lcw is taken based on the expression Lcw=(0.5÷0.7) Lw. The angle of the conical surface slope is in the range α=2.5÷3.5°. The width of the deformation slot lw depends on the diameter of the clamped load-bearing portion of the rope and is in the range lw=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.
2 dwg
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RU2383739C1 |
Authors
Dates
2017-07-28—Published
2016-05-04—Filed