Tie rod assembly for rock borehole anchor

Details Tie rod assembly for rock borehole anchor Tie rod assembly for rock borehole anchor

F - Mech Eng,Light,Heat,Weapons

16

B

85/26

F16B 13/10 (2006.01) E21D 21/00 (2006.01)

Patent

CA 1214670

ABSTRACT A tie rod assembly for a rock borehole anchor includes a tension rod having a plurality of wedge shaped spreading bolts at its lower end surrounded by spreading sleeve segments, and a sleeve on its upper end threaded to a tension nut which bears against a ground support or anchor plate upon installation and tightening. The sleeve mates with the tension rod via saw tooth configured cir- cumferential ridges or fins having increasing inclination angles, to thereby provide for a constant force trans- mission per unit of tooth length. The tension nut and anchor plate have complementarily configured spherical bearing surfaces, and the ground engaging lower area of the anchor plate has fracturable webs to accommodate surface irregularities and projections.

428065

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