System for radiating a reference laser beam and utilizing gps units for installing an article

Abstract

A novel system for facilitating the work for setting the horizontal direction of a guide laser beam is disclosed. The guide laser beam (P) can be radiated in vertical and lateral directions from the horizontal direction as a reference by a guide laser beam radiator ( ). The reference horizontal direction position of the guide laser beam radiator ( ) is detected by a first GPS unit ( ). A pole ( ) has a second GPS unit ( ) for detecting a horizontal position. A reference horizontal direction position of the guide laser radiator ( ) is detected by the first GPS unit ( ). A first horizontal direction position is detected by the second GPS unit ( ) of the pole ( ) set up at a first position ( ), thereby specifying the direction Z in which the guide laser beam (P) is to be radiated from the reference horizontal direction position as an origin. A second horizontal direction position is detected by the second GPS unit ( ) of the pole ( ) set up at a second position ( ) so as to radiate the guide laser beam (P) on the pole ( ), thus specifying the actual direction in which the guide laser beam (P) is radiated from the reference horizontal direction position as an origin. The angle (&phgr;) that the direction in which the guide laser beam (P) is to be radiated forms to the actual direction (Z ) in which the guide laser beam (P) is radiated is determined. Based on the angle &phgr;, the direction Z in which the guide laser beam (P) is actually radiated is changed to the direction Z in which the guide laser beam (P) is to be radiated.