A method for controlling the direction of a shield tunnelling machine and an apparatus therefor

摘要

When a shield tunneling machine is deviated from the scheduled line while being propelled, the deviation of shield tunneling machine from the scheduled line is detected and according to the obtained data on the deviation of shield tunneling machine from the scheduled line, the propelling direction of shield tunneling machine is controlled. A reflector 7 is mounted on a cutter head 1 provided with a cutter 5, while a target 10 and a screen 14 are mounted on a tail shield 2. Laser beam 9 is sent along the scheduled line. At the beginning of propelling shield tunneling machine A, the target and the screen is taken by s television camera 15. An image of the target and the screen is processed by an image processor 22, and a spot of beam of light projected on the target and a spot of beam of light projected on the screen are stored as the origin O and the origin o, respectively, in an image processing control unit 23. While the shield tunneling machine is propelled, the present image of the target and the screen is taken by the television camera, and processed by the image processor 22. Coordinates of the present spot 10a of beam of light projected on the target 10 and the present spot 14a of beam of light projected on the screen 14a are compared with coordinates of the origin on target O to another place and the origin of screen 0. When it is detected that the present spot 10a of beam of light projected on the target 10 the present spot 14a of beam of light projected on the screen 14a are displaced from the origin on target O and the origin of screen 0, jacks 3a, 3b are operated so that the present spot 10a of beam of light projected on the target 10 the present spot 14a of beam of light projected on the screen 14a are made to coincide with the origin on target O and the origin of screen 0.