| 摘要 |
PROBLEM TO BE SOLVED: To provide a positional detection method of an excavtion guide body which can continuously detect a position of the excavation guide body by making use of the laser target method excellent in the working efficiency even while the excavation guide body transfers from a straight section to a curved section by a specified distance, especially in the case that a projected excavation line comprises a straight section and the subsequent curved section. SOLUTION: A laser radiator 21 is installed in a starting shaft A and a target 17 as a laser receiver is installed in an excavation guide body 10 to radiate laser from the laser radiator 21 to the target 17. A horizontal runout angleθduring radiation of laser and an excavated distance of the excavation guide body 10 from the starting shaft A are successively detected to detect the position of the excavation guide body 10 on the basis of the data of the runout angleθand the excavated distance. |
