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

Abstract

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 washer fixed to the coal rocks. According to the apparatus, the core pipe is rotated to expand the expansion pipe and extrude the coal rocks so as to achieve the purposes of hole sealing and fixation, then mortar is grouted to perform hole sealing, and the sealing effect is further improved. The apparatus is simple in structure and convenient to install and operate, the determination result is accurate, and the apparatus can be reused when the sleeving pipe is replaced.

Description

technical field [0001] The invention relates to a gas sealing hole pressure measuring device in coal seams and surrounding rocks, in particular to a mechanical expansion type hole sealing pressure measuring device and a pressure measuring method suitable for oblique downward drilling. Background technique [0002] During the construction and production of coal mines, gas in coal seams and surrounding rocks will gushes out, posing a serious threat to underground safety. Due to the different gas occurrence states in different coal seams and different mines, the degree of danger caused by gas is also not the same. Only by knowing the basic properties of gas and the occurrence of coal seam gas, mastering the determination of the main parameters of coal seam gas occurrence can provide a reliable reference for gas control. [0003] Mine gas drainage drilling is sealed after completion of the design. At present, the sealing method of mines mainly uses a single cement mortar to sea...

AI Technical Summary

Problems solved by technology

[0003] Mine gas drainage boreholes are sealed after the design is completed. At present, the sealing method of mines mainly uses a single cement mortar to seal the holes. Although the sealing process is relatively simple and time-saving, the sealing effect is often not ideal.

When grouting and sealing holes in near-horizontal or gently inclined coal seams, the amount of grouting cannot be effectively controlled. Too much grouting will easily flow into the pressure measuring hole and cause blockage; insufficient grouting may lead to poor sealing of the drilled hole. Both will affect the manometric effect

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