| 摘要 |
PURPOSE:To force a shielding machine to accurately coincide with a project line at the center thereof, by determining an aimed angle through a control point from an angle obtained by comparison of the position and posture of the shielding machine with the project line and further, by obtaining a jack pattern and a copy cutter stroke from the aimed angle. CONSTITUTION:The position and posture of a shielding machine M is detected and compared with a project line PL and then an angle theta with which an intersection point of the front end T of the shielding machine M and the line PL on the front end face of the machine M under an ideal condition, coincides with each other. Next, a copy cutter stroke CS is required so as to be able to overcut so that the point Q passing through the innermost side among the machine M can be measured from the angle theta and the position and posture of the machine M. Next, a control point is obtained as the deviation (f) from the point T and the aimthetaC is obtained as an angle to coincide with the aimed position P1 of the subsequent ring after excavation by one ring length LS of the segment. Moreover, the jack pattern is obtained to bend by the angle thetaC and to force the direction H to coincide with H1 in order to superpose the center S of machine M on the line PL. |
