Hole drilling and sealing device and method with continuous belt pressure

Abstract

The invention discloses a hole drilling and sealing device and method with continuous belt pressure. The device comprises a gas extraction pipe, a grouting pipe, a grout return pipe, grout blocking plates, a grout storing tank, a grout pressing plate and a spring, wherein the grout blocking plates are connected to the gas extraction pipe at equal intervals of 10m to enable the gas extraction pipe to be fed into a dill hole, and the outer grout blocking plate is made to be in the drill hole and in the position away from the opening of the drill hole for 1m. Inorganic flexible pasty fluid is injected to the drill hole space between every two grout blocking plates through the grouting pipe; when the grout return pipe performs grout returning, the grout return pipe and a grout supplementing valve on the lower portion of the grout storing tank are connected, an air receiving valve is opened, and continuous air pressure is applied to the inorganic flexible pasty fluid in the grout storing tank; when fractures around the drill hole increase, the inorganic flexible pasty fluid is continuously pressed into the fractures around the drill hole by the air pressure in the well. When the inorganic flexible pasty fluid in the grout storing tank is totally pressed into the drill hole, a pressure relief valve is opened, and a grout pressing plate ascends under the action of the spring. Due to the fact that the inorganic flexible pasty fluid is injected into the grout storing tank again through a grouting valve, the drill hole is effectively sealed through the continuous belt pressure.

Description

technical field [0001] The invention relates to a continuous pressurized drilling hole sealing device and method, belonging to the field of coal mine drilling hole sealing and regional gas control, and is especially suitable for drilling in areas where coal seam dynamic phenomena are serious and there are many cracks around the drilling holes Carry out sealing work inside. Background technique [0002] Effective sealing of gas drainage boreholes is the key to underground gas drainage in coal mines. At present, my country's coal mines generally use polyurethane, cement and other drilling and sealing materials. They mainly mix various chemical slurries by manual mixing. The extraction pipe is inserted into the extraction hole together. Or directly inject into the extraction hole through the grouting pump. After the reaction is complete, the generated drilling and sealing materials are all solid materials, and there will be a large number of pores and cracks in the body of th...

AI Technical Summary

Problems solved by technology

Moreover, in the process of coal seam mining, a large number of pores and fissures will be generated around the drilling hole and the drilling sealing material itself, which will affect the gas drainage effect during the gas drainage process.

However, the existing sealing methods are all in the form of passive grouting, and it is difficult to seal the cracks that may occur around the borehole at any time through one-time grouting or two-time grouting

Moreover, the sealing material is a solid material after solidification, which cannot provide a re-grouting channel

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