| 摘要 |
PROBLEM TO BE SOLVED: To provide a direction setting system for guide laser beam capable of facilitating the work for setting a guide laser beam in the horizontal direction. SOLUTION: A guide laser beam emission device 20 disposed at a reference point 77 and inclined vertically and laterally relative to the horizontal direction to emit the guide laser beam P, a first reflection mirror 75 disposed directly above the reference point 77, a second reflection mirror 76 disposed directly above a reference point 83 different from the reference point 77, a surveying instrument 101 for determining the positions of the respective reflection mirrors by irradiating the mirrors with a laser beam for survey and receiving the reflected laser beam from the respective reflection mirrors, and a guide mirror 76' disposed between these mirrors to guide the direction of emission of the laser beam P into a vertical plane Z defined by the two mirrors are prepared. The direction of emission of the laser beam P is positioned in the vertical plane Z by determining whether or not the guide mirror 76' is positioned in the vertical plane Z.
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