Mechanical expansion type hole sealing pressure measuring apparatus and pressure measuring method

The invention relates to a gas hole sealing pressure measuring apparatus applied to coal seams and surrounding rocks, and specifically relates to a mechanical expansion type hole sealing pressure measuring apparatus and a pressure measuring method suitable for inclinedly and downwardly drilling holes. The mechanical expansion type hole sealing pressure measuring apparatus comprises a piezometer pipe, a grouting pipe and a grouting pump, and also comprises a core pipe, an expansion pipe and a sleeving pipe, the expansion pipe is a part of the sleeving pipe, and the front of the sleeving pipe is provided with a sleeving pipe nut; the core pipe is sleeved with the sleeving pipe, and the front of the core pipe is provided with a core pipe screw; the piezometer pipe penetrates the core pipe and is positioned by a rubber plug; the grouting pipe stretches into the core pipe; the core pipe and the sleeving pipe are respectively provided with flower holes; and an outer end of the sleeving pipe is sleeved with a fixed