| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for correcting a measured angle in the case that a laser light is deflected by temperature difference generated between an underground piping and a shaft and in the case that a laser light is deflected by temperature difference generated in the underground piping, when a position of a shield excavator is detected by a laser target method. SOLUTION: When an angle is measured between a total station 20 installed at a reference point D (the center point of the total station 20) in the shaft A and the center point E of a total station 50 arranged in the underground piping 40, an error angle due to deflection of a laser light which is caused by temperature difference between an inner space B of the underground piping 40 and the shaft A is calculated. This error angle is distributed to an actually measured angle of the total station 20 and that of the total station 50, thereby performing angle correction.
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