| 摘要 |
<p>The present invention relates to a rod for a bedrock boring apparatus which provides a structure for injecting compressed air into a work site, wherein the ratio of the inner diameter to the outer diameter of the rod for the bedrock boring apparatus is optimized, so as to maximize the strength of the rod in the structure. For this purpose, the present invention relates to the rod for the bedrock boring apparatus, consisting essentially of: a boring bit having high strength projections formed thereon for boring the bedrock; and the rod having one end connected to the boring bit and the other end connected to external equipment, wherein a spray hole is formed in the boring bit in order to suction impurities that are released during bedrock boring, a supplying hole is formed in the rod for supplying and spraying compressed air toward the spray hole, the rod is formed in a hollow shape having the outer diameter and the inner diameter, and the ratio of the outer diameter to the inner diameter of the rod is selected within a range of 2.16:1 to 3.25:1.</p> |
