| 摘要 |
PROBLEM TO BE SOLVED: To provide a visual thin type theodolite capable of being mounted inside a pit with small diameter in a narrow working site and being visually monitored. SOLUTION: The visual theodolite 3 is used when the ground is dug horizontally by a pipe burying mechanism 2 installed inside the pit 1, and a pipe is pressed from the rear, propelled and buried in the ground. A rotating axis 17 of an optical material for changing optical path 15 bending the viewing axis is supported on a post portion 14 of a theodolite main body 10 installed through a base member disposed on the bottom position of the pit 1. The optical material for changing optical path 15 and a telephoto member 16 are disposed so that the objective and ocular sections with large and small diameters 16a, 16b are in the circumferential direction in relation to a digging axis of pipe to be buried, and a CCD camera 21 is mounted on the ocular section, and a detected image is displayed on a screen 25a, and the deviation between a target point and a detected point is calculated manually or automatically and fed back to a mechanism for correcting digging direction, and thereby the pipe buried direction is adjusted manually or automatically.
|
