| 摘要 |
PROBLEM TO BE SOLVED: To enable a single hole to be drilled in the state of keeping a guide rod attached, and to make a preceding hole easily viewable in the formation of a continuous hole. SOLUTION: In this bedrock drilling equipment, the drilling rod, the tip of which is provided with a bit for drilling the bedrock, and the guide rod, which is inserted into the preceding hole drilled in the bedrock, are provided almost in parallel with each other. The bedrock drilling equipment is equipped with a bracket 5 which is fixed to an equipment body, which allows the insertion of the drilling rod so as to rotatably support it and which supports the guide rod in an inserted and fixed state, a telescopic guide rod 7, the length of which is made variable by slidably assembling a small-diameter rod and a large-diameter rod 7a together, and a guide-rod attaching/detaching operation part 8 which enables the guide rod 7 to be attached to/detached from the equipment body. The operation part 8 has an operation lever 8a which is provided on the large-diameter rod 7a, so as to maintain the state of fixing the large-diameter rod 7a to the bracket 5 and release the fixed state. COPYRIGHT: (C)2006,JPO&NCIPI
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