| 摘要 |
PURPOSE: A ground excavating apparatus with an improved material supply pipe which is exposed is provided to prevent damage to an auger rod by arranging the improved material supply pipe between the auger rods. CONSTITUTION: A ground excavating apparatus with an improved material supply pipe which is exposed comprises auger rods(100:100-1,100-2,100-3), and an improved material supply pipe(200:200-1,200-2). Hammer bit(120:120-1,120-2,120-3) are mounted on the lower end of the auger rod. The hammer bit crushes rock layers or belemnite layers with reciprocating vertically. A rotating vane(110:110-1,110-3) is formed on the outer circumference of the auger rod. The improved material supply pipe is exposed to the outside. The improved material supply pipe is arranged to be parallel to the auger rod.
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