Device and method for enhancing stability of steel casing during pore-forming construction

The invention discloses a device and method for enhancing the stability of a steel casing during pore-forming construction. The device comprises the steel casing. A plurality of grouting guide pipes used for filling cement slurry to a soil mass are welded to the outer sidewall of the steel casing. Each grouting guide pipe is provided with a plurality of slurry delivery holes at different heights.The device further comprises a plurality of slurry delivery branch pipes used for communicating with upper ports of the grouting guide pipes. Each grouting guide pipe is provided with a pressure sensor used for measuring the stress of the bottom of the grouting guide pipe. The device further comprises a plurality of pay-off length adjustable rope sheaves in one-to-one correspondence with the grouting guide pipes. A steel wire rope is led out from each rope sheave, and the tail end of the steel wire rope is provided with an end cap used for falling into the corresponding grouting guide pipe tocontrol the grouting heigh