Construction method for double-sliding installation of super-tonnage spherical support of high-speed railway

The invention provides a construction method for double-sliding installation of a super-tonnage spherical support of a high-speed railway. The construction method comprises the following construction steps that scabbling is conducted on the contact face of the top of a support padstone, and the center line of the support is drawn; mounting a cushion stone top fine flat steel plate; installing a transverse sliding I-shaped steel beam, and fixing the transverse sliding I-shaped steel beam with a pier top embedded bolt; a double-spliced transverse sliding bailey beam is installed, the double-spliced bailey beam is assembled on the pier top, four I-shaped steel bolts are connected to form a frame beam, and the rear portion of the frame beam is anchored to the pier top embedded bolts; mounting a bailey beam top longitudinal sliding lifting frame and a lifting system; the support is placed on a pier bottom lifting platform, and the support is lifted to the position above the top elevation of a padstone through a li