RU2011824C1 - Method for mining thick steep coal seams under fires on upper horizon - Google Patents

Abstract

FIELD: coal mining. SUBSTANCE: preliminarily loosened coal under flexible roof is extracted by auger units installed on fringe drifts dividing extraction district into two sublevels. Extraction of loosened coal is carried out with leading on upper sublevel. EFFECT: higher efficiency. 2 cl, 3 dwg

Description

 The invention relates to the mining industry and can be used in mining powerful steep coal seams, namely under fires on the upper horizon.

 A known method of developing powerful steep seams, including the preparation of the excavation section with the pillar of a stable shape, the construction of a flexible overlap in the mounting lava at the top of the formation and under the horizontal horizon, and the excavation of the remaining thickness of the coal with an “edged shield”.

 The disadvantage of this method is the high complexity of the work.

 A known method for the development of powerful steep formations, including the preparation of a excavation section, the excavation of the installation layer at the roof of the formation, the construction of flexible overlap without breaking the continuity, the excavation of the remaining thickness from the sub-floor drifts by a blasting method.

 The disadvantages of this method are the high fire hazard and the complexity of the work.

 A known method of mining powerful steep seams under the protection of flexible overlap with a tab, adopted as a prototype, including the preparation of a excavation section, the development of the installation layer (lava) at the roof of the formation and under the horizontal horizon, the erection of a flexible overlap and excavation of the remaining thickness of coal by drilling and blasting from special drifts and orths in strips 1.5–2 m thick along the strike of the formation towards the soil of the formation.

 The disadvantages of this method are the high complexity of the work and a large amount of preparatory work.

 The purpose of the invention is to increase the safety of work and reduce the complexity.

 This goal is achieved by the fact that the previously loosened coal thickness under a flexible ceiling is removed by a screw-screw installation installed on field drifts dividing the extraction section into two sub-floors.

 Patent studies have shown that neither in the patent nor in the scientific and technical literature there is information about the methods that would have the same inventive step as the claimed method. Thus, it is legitimate to conclude that the proposed method meets the criteria of the invention of "novelty."

A comparative analysis of the proposed technical solution and prototype allows to identify the following inventive step:
the previously loosened coal thickness under a flexible ceiling is removed by auger installations installed on field drifts;
field drifts divide the extraction section into two sub-floors;
the excavation of the loosened coal stratum is advanced ahead of the upper sub-floor.

 In FIG. 1 shows a diagram of the preparation of the excavation section and the extraction of the undercut layer; in FIG. 2 - sequential, starting from the upper sub-floor, excavation of the loosened coal stratum under flexible overlap; in FIG. 3 - refinement of the lower sub-floor.

 The method is as follows.

 Preparation of a powerful stratum 1 is carried out by layered drifts 2 and 3, passed at the roof and soil of formation 1 under an entirely horizontal horizon 4 of stable form, and field drifts 5 and 6. From field drifts 5 and 6 at a distance equal to the length of the shield aggregate, unit vectors 7 and 8, slopes 9 pass from them at the roof of formation 1, and parallel drifts 10 and 11 at the formation 1 soil. A slot 12 is cut between the layer ventilation drifts 2 and 3 by means of a coal saw and a flexible ceiling 13 is mounted in it. On the layer ventilation drift 2 walked at the top of formation 1, mon excavation unit 14 (type ANSH) is excavated and the undercut layer 15 is excavated at the top of the formation 1 with the simultaneous laying of flexible overlap 13. At that, the undercut layer 15 is excavated by the excavation unit 14, which leads to faster destruction of the roof rocks compared to the entire horizontal coal 4. When hard-collapsed types of roof rocks are forced to collapse behind the excavation unit 14.

 Simultaneously with the notch of the undercut layer 15, a gap 16 is cut between the layer ventilation drift 3 and the parallel drifts 10 and 11. Then, the fan holes 17 are drilled from the layer ventilation drift 3 and the parallel drifts 10 and 11 at the top of the formation 1 and the two thicknesses of coal are loosened sub-floors.

 After this, advancing on the upper sub-floor, they begin to excavate coal from field drifts 5 and 6 with auger units 18 and 19.

 The method can significantly increase safety and reduce the complexity of the work, as well as completely eliminate the bypass of an endogenous fire from the upper horizon.

Claims (2)

 1. METHOD FOR THE DEVELOPMENT OF POWERFUL STEEP COAL COAL FORMATIONS UNDER FIRE AT THE TOP HORIZON, including the preparation of excavation sites by conducting reservoir and field workings, the formation of an interhorizontal pillar of a stable form, the development of the installation layer under the whole and in the roof of the formation, the construction of a flexible cover for excavation in the installation section by sub-floors under flexible overlapping and filling of the worked-out space with rock, characterized in that the excavation section is divided into reservoir and field workings by the upper and lower floors, the coal reserves in the floors are subjected to preliminary loosening, in the subfloor field workings, screw-screw plants are installed, which excavate the loosened coal under flexible overlap separately in each sub-floor.  2. The method according to p. 1, characterized in that the excavation of the loosened coal lead ahead of the upper sub-floor.

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