| 摘要 |
<p>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 circumferential ridges or fins having increasing inclination angles, to thereby provide for a constant force transmission 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.</p> |
