| 摘要 |
PURPOSE:To make it possible to set an initial value at a shapr curve area in automatic mode by computing the position..of a shield machine main body based on an angle which a rod forms with the shield machine and a carriage to be connected and the distance of the carriage to a wall surface. CONSTITUTION:Based on coordinates of a measurement point (a) and an azimuth thetaa, the coordinates of measurement points (b), (c) and (d) are determined from the angle determined with an angle detection device 10 and the length of rods 5 and 6. Then, the distances between the points P1 to P3 on a wall surface W is determined with a separation distance sensor 11. Based on the data, the points P1 to P3 on the wall surface W are decided as the reference points, thereby computing the coordinate the measurement point (d) of the shield machine main body 1. Then, the carriages 2 to 4 are moved by a single carriage. The coordiantes of the measurement points A and B after the movement are considered as identical to the coordinates of the measurement points (b) and (c) be fore the movement. When the data of the sensor 11 diffgers from that before the movement, its corrected portion is added thereto so ad to determine the coordinates of the measurement points A and B. The coordinates of measurements points C and D are computed based on newly obtained angles thetaB, thetaC and thetaD. This construction makes it possible to automate an initial setting at each curve area. |
