Water stop casing pipe suitable for pipe-following drilling of pneumatic down-the-hole hammer and construction method of water stop casing pipe

The invention discloses a water-stop casing pipe suitable for pipe-following drilling of a pneumatic down-the-hole hammer and a construction method of the water-stop casing pipe, and belongs to the field of water-stop casing pipes. The construction method specifically comprises the following steps that S1, an eccentric drilling tool of the air down-the-hole hammer is placed in the water-stop casing pipe, and the eccentric drilling tool is kept vertical and connected with a drill pipe through a suspension method; compared with the prior art, the novel water stop sleeve has the advantages that when the pneumatic down-the-hole hammer casing-following drilling technology is adopted, the technical problem that the shallow water stop effect is poor is always the technical problem, by means of the novel water stop sleeve, the gap between the outer wall of the sleeve and rock can be effectively and fully filled, and the sleeve water stop effect of pneumatic down-the-hole hammer casing-following drilling is improved.