| 摘要 |
<P>PROBLEM TO BE SOLVED: To shorten the entire construction period so as to reduce construction cost by shortening the measurement time of a boring locus using a gyroscope that has influence on the construction time. <P>SOLUTION: A boring device 10 is used in a curved boring method comprising installing a tip bit 40 in the tip of a hole drilling pipe 20, and inserting the tip bit 40 in a soil to bore a hole. In this device, in the step of inserting a gyroscope 30 in the hole drilling pipe 20, a high-pressure fluid(for example, compressed-air) is sent in the hole drilling pipe 20 by a high-pressure fluid blower (for example, compressed-air blower 50), so as to forcibly feed the gyroscope 30 to the tip of the hole drilling pipe 20. <P>COPYRIGHT: (C)2012,JPO&INPIT |
