DISPLAY METHOD FOR ADVANCE STATE OF TUNNEL EXCAVATOR

PROBLEM TO BE SOLVED: To obtain a display method in which whether direction control amount of a tunnel excavator is proper or not can be judged simply and precisely, by a method wherein the displacement amount and the deflection angle amount of the tunnel excavator with reference to a tunnel scheme line are displayed in every prescribed advance length. SOLUTION: When a tunnel excavating operation is started, the displacement amount 0 in the horizontal direction of a tunnel excavator is displayed on a longitudinal line at the left edge of a display screen 9a on one side, and the deflection angle amount with reference to a tunnel scheme line X of the excavator at this time is displayed by an arrow A on a display screen 9b on the other side. Then, whenever the excavator is advanced by a prescribed length (one span or one ring portion of a segment), the deflection angle amount of the excavator at this time is displayed by a new arrow A by erasing the arrow A which is displayed before. At this time, the displacement amount of the excavator is displayed sequentially in points a2 , a3 on the axis of ordinates 22 of the display screen 9a. A first point and a point a1 are connected by a straight line c1 , and the points a2 , a3 are connected by a straight line c2 so as to be displayed. As a result, the displacement amount and the a angle amount from the tunnel scheme line X of the excavator as well as the deflection angle, i.e., the posture, and the direction of the excavator can be confirmed, and the direction can be controlled precisely.