METHOD OF CONSTRUCTING APPROACH SECTION

PROBLEM TO BE SOLVED: To provide a method of constructing an approach section of a grade separation road, according to which traffic lane regulations are reduced during a construction period. SOLUTION: According to the method, a vertically expandable expansion leg 30 is arranged at a location that is spaced away from a pier 10 at a terminal of an elevated portion, in an extending direction of an elevated road, and after expanding the expansion leg 30 to a height equal to that of the pier 10, an approach girder 20 is erected between upper surfaces of the pier 10 and the expansion leg 30, followed by fixing a pier 10-side end of the approach girder 20 to a hinge 15 arranged on an upper edge of the pier 10. Thereafter by contracting the expansion leg 30 bearing a lower surface of the approach girder 20, the approach girder 20 is rotated about the hinge 15, and the approach girder 20 is lowered until an anti-pier 10-side end thereof abuts on a lower road 1, to thereby construct the approach section. Therefore most of the construction procedure is carried out on areas over the lower road 1, and during execution of the construction procedure, the lower road 1 is available, to thereby reduce the traffic lane regulations during the construction period. COPYRIGHT: (C)2007,JPO&INPIT