Water collecting and draining method after integral casting of blast furnace hearth

The invention discloses a water collection and drainage method after integral casting of a blast furnace hearth, and relates to the technical field of blast furnace longevity, and the method comprises the following steps: 1) determining the position and number of drainage holes according to the position and number of blast furnace cooling walls; 2) drilling a drainage hole in the blast furnace; (3) a drainage pipe is fixed to the drainage hole, a drainage control valve is arranged at the end, away from the blast furnace, of the drainage pipe and connected with a water collecting hopper through a collecting pipe, and the collecting pipe enters an inlet of the water collecting hopper and is ignited through gas fire; (4) a liquid level displayer is installed in the water collecting hopper, the water collecting hopper is led to the drainage ditch through a measuring pipeline, a measuring control valve is arranged in the measuring pipeline, and a flow meter is additionally installed; (5) opening a drainage control