| 摘要 |
<p>PURPOSE:To enable execution of automatic and efficient measurement in real time even when a planned line of a tunnel extends at a long distance or curves, by a method wherein a change in a magnetic force on the basis of a magnetism generating means is detected by a magnetic sensor network formed of a plurality of magnetic sensors provided above a line of excavation. CONSTITUTION:A magnetic sensor network 12 formed of a plurality of magnetic sensors 10 for detecting a change in magnetism in the ground is provided above a line of excavation of an underground excavator 20. A change in a magnetic force based on a magnet 22 of a magnetism generating means attached to the excavator 20 is detected by the sensor network 12 and a plane position of the excavator 20 is detected therefrom. In other words, the excavator 20 having the magnet 22 attached thereto is passed under the sensor network 12 and the magnetism of the magnet 22 can be detected as an external magnetism by the sensors 10 positioned above. According to this method, the position of the excavator 20 within a horizontal plane can be detected from the relative positions of the sensor network 12 having the known coordinates and the sensors 10.</p> |
