| 摘要 |
PURPOSE:To enable measurement of the position and displacement at the final measuring point by measuring the angle and distance of a moving point with respect to a reference point at a fixed point prior to movement and measuring the angle and distance of the final measuring point with respect to the fixed point at the moving point after the movement. CONSTITUTION:The angle alpha between the reference point M viewed backward by a laser transmitter 21 of a measuring device 2 provided at a fixed point P0 and a measuring device 3 provided at a moving point P1 which is the inflection point of a curve is measured. The angle beta between the detector 41 of a measuring device 4 of a shield excavator existing at a final measuring point P2 and an aiming target 22 is measured by an oscillator 34 and an optical rangefinder 36 at the point P1. The distances l1, l2 are also measured by the reflection from the targets 23, 42. The angles alpha, beta and the distances l1, l2 when the point P1 moves are successively measured. The position of the shield excavator with respect to the reference point M is thus known at all times. |
