Method for vertically drilling large-diameter lifesaving hole

The invention discloses a method for vertically drilling a large-diameter lifesaving hole. The method comprises the following steps that commercial concrete and broken stone materials are repeatedly rolled and leveled on a drilling machine mounting foundation to enhance the supporting strength and the flatness of the foundation; when a drilling machine is mounted, leveling is carried out in the horizontal direction and vertical alignment is carried out through a horizontal ruler, multi-position repeated verification is carried out, and it is ensured that a drilling tool is completely vertical in the natural lifting state; a drilling structure is designed, and parameters of a down-the-hole hammer are determined according to the drilling structure; according to the parameters of the down-the-hole hammer, the mode of drilling tool combination is determined; and drilling pressure, rotating speed and air quantity drilling numerical values are set, parameters are ensured to be unchanged in the operation process, an