| 摘要 |
<p>An elongate hbllow rock structure and installation includes a bolt (10) having a hollow elongate shank (12) formed by a series of outwardly bowed sides or side portions (24, 25) that are capable of resilient deflection. Fins (32, 33) are provided on the sides or the side portions (24, 25) with the overall span of the fins being greater than the bolt hole (21) into which the bolt (10) is to be impacted. The fins (32, 33) are tapered so as to provide for ease of insertion of the bolt (10). Impaction of the bolt (10) into a mine roof hole (21) provides for a compression loading of the fins (32, 33) of the bolt shank such that these engage the aperture wall in a forced-compression state. Corrosion factors are limited to fin edge contact with the aperture wall of the bolt hole (21). Resilient sides' deformation at the core of the bolt shank is relied upon to compression load the fins (32, 33) for frictional contact with the aperture wall (21) into which the bold (10) is implaced.</p> |
