A three-dimensional graded gangue and gas blocking device and method for self-forming roadways without coal pillars

Abstract

The invention discloses a three-dimensional graded gangue and gas blocking device and method for self-forming lanes without coal pillars, including gas blocking materials and sequentially connected graded gangue blocking units; Mechanism and mesh-like secondary gangue-retaining mechanism, the mesh of the first-level gangue-retaining mechanism is larger than the mesh of the second-level gangue-retaining mechanism, the first-level gangue-retaining mechanism is located in the goaf close to the fallen gangue, and the second-level gangue-retaining mechanism is located in the roadway One side; the upper and lower ends of the first-level gangue-retaining mechanism and the second-level gangue-retaining mechanism are connected through a horizontal hydraulic device, and the horizontal hydraulic device realizes lateral expansion and contraction through hydraulic pressure, thereby realizing the displacement of the second-level gangue-retaining mechanism, and avoiding a large amount of gangue acting on the ground instantaneously. A single gangue retaining structure causes bending damage to the gangue retaining structure, realizing three-dimensional and graded gangue retaining. Gas-blocking materials are laid outside the graded gangue-blocking unit to prevent harmful gases from flowing into the roadway.

Description

technical field [0001] The invention relates to the field of mine safety, and specifically discloses a three-dimensional graded gangue and gas blocking device and method for self-forming lanes without coal pillars. Background technique [0002] Roof cutting into roadway is a new mining method without coal pillars. It cancels the filling rock pillars in the conventional gob-side entry retention, and does not need to use artificial filling materials. It only needs to unload the roof and lower the roof. Coal pillar-free mining can be realized by combining the crushing and swelling characteristics of the coal body. As the roof cutting technology becomes more and more mature, it has been popularized and applied in thin and medium-thick coal seams, and the effect is obvious. However, there are still many technical limitations in the popularization and application of self-forming roadway technology without coal pillars under the conditions of thick coal seam mining and broken roof...

AI Technical Summary

Problems solved by technology

However, there are still many technical limitations in the popularization and application of self-forming roadway technology without coal pillars under the conditions of thick coal seam mining and broken roof: on the one hand, due to the large mining space of thick coal seam, the loosening range of the roof rock mass in the gob area is large, The gangue formed has a large capacity, and the instantaneous impact force and long-term extrusion force on the roadside gangue retaining structure are relatively large; conventional gangue retaining mechanisms such as I-beams and single hydraulic props commonly used in thin and medium-thick coal seams are used in thick coal seams. Under the condition of self-forming roadway without coal pillars, problems such as bending deformation and pressing into the bottom plate are prone to occur, which cannot be recycled again, and make the self-forming roadway without coal pillars in a state of large deformation

On the other hand, when the formation conditions of the coal seam are more complex, after the coal seam is mined, many harmful gases such as carbon monoxide, methane, etc. are free in the gangue, and gradually rush out into the roadway; The goaf is isolated by means of backing and filling, but when the amount of harmful gas is large and the dissociation is good, the harmful gas will inevitably rush out into the roadway

Finally, the gangue retaining structure is mostly arranged in the critical area between the original roadway and the goaf, and the gangue retaining structure is easily affected by the roof settlement. When the roadway roof sinks relatively large, the support structure is prone to deformation and failure

Images