| 摘要 |
PROBLEM TO BE SOLVED: To provide a tip position measurement method of a drilling pipe which correctly and easily measures its tip position even if it is the small-diameter drilling pipe and there is an aboveground structure at a place, and a tip position measurement system. SOLUTION: In the method for measuring the tip position of the drilling pipe C propelled as it drills in the ground, a receiver 30 is provided at a back end in the propelling direction of the drilling pipe C. A plurality of transmitters 20 are buried at predetermined positions in the ground in which the tip of the drilling pipe C is propelled. Each transmitter 20 transmits a measurement sound wave in the tip direction of the drilling pipe C. After the receiver 30 receives the measurement sound wave traveling in the drilling pipe C, the received measurement sound wave is analyzed so as to measure the tip position of the drilling pipe C. Even if the drilling pipe is the small-diameter drilling pipe and there is the above-ground structure at the place, its tip position can be correctly and easily measured. COPYRIGHT: (C)2011,JPO&INPIT |
