Combined device for float casing arrangement and check valve well cementation

The invention belongs to the field of hydrogeological drilling technical process, and provides a combined device for float casing arrangement and check valve well cementation, which has a novel structure, can reduce tensile force caused by dead weight of a well casing and can achieve the purpose of well cementation by means of safely sealing annular gaps in the external of the well casing through cement slurry. The combined device for float casing arrangement and check valve well cementation includes the well casing and a float board, wherein the float board is fixed in the well casing; a through pipe is arranged in the center of the float board; two check valves connected in series are arranged at the upper part and the lower part of the inside of the through pipe respectively; a reversely threaded catcher for fixing a drill pipe is mounted at the upper part of the through pipe; the float board is round; at least one through hole is formed in the lower part of the well casing. The combined device is widely applied to the field of hydrogeological drilling technical process.