| 摘要 |
<p>The periphery of the anchoring portion of the bolt 4 is provided with a plurality of individual ribs 3 extending obliquely with respect to the longitudinal axis of the bolt. One end of each rib 3 lies on the same circumferential line as one end of the next rib. A hole for receiving fixing agent (e.g. adhesive) is drilled in the masonry, which hole has a diameter corresponding to the diameter of the bolt measured across the ribs. <IMAGE></p> |
