SWITCHING CONSTRUCTION METHOD DIRECTLY UNDER RAIL TRUCK

PROBLEM TO BE SOLVED: To enable work execution without removing construction girders so as to extremely simplify construction, and divide operations switching to ballast finally constructed and ties finally constructed or the like into one day's worth of work execution mount so as to achieve economical performance rich in rationality. SOLUTION: A saddle 5 is positioned for receiving a construction girder 1, and the girder 1 is lowered according to the slope in order to align a rail track height to a track height finally constructed. In addition, the construction girder 1 is lowered again by a distance equivalent to the difference between the height from the construction girder 1 top end to a rail 3 top end and the track height finally constructed (from a road-bed bottom end to a rail top end). At this time, a rail sleeper girder is inserted between the construction girder 1 and a tie 2 so as not to change the rail top end. After a second lowering of the construction girder 1, concrete is filled up to the construction girder 1 top end to be buried. Afterwards the tie 2 and the tie girder are removed, and road-bed ballast and a tie finally constructed are installed.