METHOD OF CONTINUOUSLY LAYING TWO OR MORE PRECAST CONCRETE STRUCTURES VIA UPGRADE

PROBLEM TO BE SOLVED: To provide a method of continuously laying two or more precast concrete structures via an upgrade which, even when a transfer passage has an upgrade portion, can transfer two or more precast concrete structures in a connected posture without interference with the upgrade portion. SOLUTION: Precast box culverts 1, 1 are connected so as to leave a space S between them, at least at two positions at upper and lower positions in the space S through space adjustment members 2, 2, and transferred. When the forward precast box culvert 1 goes into the upgrade portion Rb, the space adjustment member 2 is adjusted so that the forward precast box culvert 1 has a same posture as a posture at the upgrade portion Rb, and when the following precast box culvert 1 goes into the upgrade portion Rb, the space adjustment member 2 is adjusted so that the following precast box culvert 1 has a same posture as a posture at the upgrade portion Rb. COPYRIGHT: (C)2011,JPO&INPIT