| 摘要 |
PURPOSE:To monitor soil during the operation of a drilling machine by providing plural transmitting and receiving antennas for an electromagnetic wave pulse over the tip of the guide pipe of a shield part, and measuring an echo and detecting a discontinuous part of the soil. CONSTITUTION:The antennas 3 and 4 are provided in a peripheral wall over the tip of the shield part guide pipe 2 of the shield drilling machine, and connected to a control circuit 7 through transmitting and receiving circuits 5 and 6 to display a received waveform on a display device 8. Then, data on various kinds of soil such as water-permeable soil and clay soil are collected previously to judge the display graphic form accurately. |
