Mining gas extraction hole sealing system

Abstract

The invention provides a mining gas extraction hole sealing system, which belongs to the technical field of mining hole sealing, and comprises an inner side bag type plug and an outer side bag type plug, and grouting liquid pipes are arranged in the inner side bag type plug and the outer side bag type plug in a communicating manner; the grouting equipment provides grouting liquid for the inner bag type plug and the outer bag type plug through a grouting liquid pipe; a middle mucus plugging section is formed between the inner-side bag type plugging part and the outer-side bag type plugging part, mucus injection equipment injects mucus into the middle mucus plugging section through a mucus injection pipe, and continuous pressure maintaining is carried out; according to the invention, the two ends are plugged by adopting the bags into which the slurry can be injected, the middle mucus plugging section is formed between the bags at the two ends, the non-solidified mucus is injected into the middle mucus plugging section, and meanwhile, the mucus can be supplemented in time when the pressure of the middle mucus plugging section is reduced so as to keep a certain pressure; therefore, the drilling hole sealing effect is guaranteed, the gas extraction concentration and efficiency are improved, and safe production of a coal mine is guaranteed.

Description

technical field [0001] The invention relates to the technical field of hole sealing for mines, in particular to a hole sealing system for mining gas drainage. Background technique [0002] At present, the "two blocks and one injection" sealing process is as follows: the grouting type (pressurized) hole sealing device for gas drainage of the bag is mainly composed of a grouting pipe, a gas drainage pipe, a one-way valve, a blasting valve, a bag, Plugs etc. The grouting pipe of the hole sealer is connected with the grouting pump, and the grouting liquid stirred in the mixing tank enters the grouting pipe and the bladder through the grouting pump, and the bladder expands rapidly, and the outer diameter of the bladder is fastened to the coal seam. On the hole wall, the holes at both ends of the hole sealer are closed; when the pressure reaches, the blasting valve explodes, and the grouting fluid fills the middle part of the two bladders, thereby realizing multi-layer sealing, a...

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Problems solved by technology

[0003] However, since the cross-sectional shape of the borehole is divided into a broken zone, a plastic zone and an elastic curve sequentially from the hole wall to the inside of the coal seam, there are irregular cracks in the broken zone and the plastic zone, the existing sealing system for mining gas drainage mainly uses The grouting type hole sealer seals the borehole, and the grouting fluid of the grouting type hole sealer cannot penetrate into these cracks well, and the distribution and development of cracks in the coal (rock) mass around the drilling hole will change over time. However, the grouting fluid will solidify after a period of time and cannot penetrate into the newly created cracks. Therefore, the grouting equipment cannot replenish grout or maintain pressure on the grouting sealer, making the existing grouting sealer The poor sealing effect of the orifice on the middle section will cause problems such as poor sealing, gas leakage, and short circuit in the gas extraction process, resulting in low gas extraction concentration and unable to achieve the expected gas extraction effect , thus affecting coal mine safety production

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