Device and method for simultaneously measuring multi coal seams gas pressure based on downward penetrating drilling

Abstract

The invention discloses a device and method for simultaneously measuring multi coal seams gas pressure based on downward penetrating drilling. The pressure measuring device comprises a casing, whereinthe casing is arranged in a drill hole and is communicated with a plurality of coal seams and rock strata, a flange plate, wherein the flange plate corresponding to the position of a top bottom plateof the coal seam is arranged on the casing, an isolation bag, wherein the isolation bag is fixed on the pipeline adjacent to the flange plate and the isolation bag is used for isolating an air chamber and a cement mortar filling chamber so as to prevent the cement mortar from flowing into the air chamber. Each pipe in the casing is divided into two purposes of grouting and pressure measurement, an isolated space and an orifice between adjacent isolation bags are respectively connected with a grouting pipe and a pressure measurement pipe in the casing, an isolated space connected with a rock stratum is the cement mortar filling chamber, the cement mortar filling chamber is communicated with the orifice through the grouting pipe and is used for grouting, the orifice end of the grouting pipeis connected with a grouting pump and grouting is carried out to the cement mortar filling chamber; the isolated space connected with the coal seam is an air chamber which is communicated with the orifice through a pressure measuring pipe, and the orifice end of the pressure measuring pipe is connected with a pressure gauge and used for measuring pressure. The pressure measuring method carries out layered pressure measurement based on the device. The device and the method for simultaneously measuring multi coal seams gas pressure based on downward penetrating drilling has the advantages of good pressure measuring effect, low construction cost, simple and easily-obtained materials, and can effectively solve the problems of large construction amount and high measurement cost for independently measuring the gas pressure of the coal seam group and the like.

Description

Technical field [0001] The invention relates to a device and method for measuring gas pressure in coal mines, especially a device and method for simultaneously measuring gas pressure in multiple coal seams based on downward drilling, which is suitable for simultaneous measurement of downward drilling in multi-coal seam geological conditions. The technical field of coal seam group gas pressure. Background technique [0002] The geological conditions of coal occurrence in my country are complex. With the increase of coal mining depth, the gas content and pressure of coal seams increase, and the risk of gas disasters increases. The prevention and control of gas disasters is the top priority in ensuring the safety of coal mining. Coal seam gas pressure value is one of the important indicators to identify the mine gas grade, evaluate the coal and gas outburst risk of coal seam, and formulate the gas drainage plan. Measuring coal seam gas pressure is an important part of gas disa...

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Problems solved by technology

[0004] Aiming at the defects of the existing coal seam gas pressure measuring device and method, the object of the present invention is to provide an accurate, convenient, economical and practical device and method for simultaneously measuring multi-coal seam gas pressure based on downward drilling

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