SU92852A1 - Metallic overlap for fencing workspace of the cleaning face from the collapsing side rocks - Google Patents

Description

The invention relates to the field of methods for developing high-power falling coal seams.

Methods and devices are known — rigid and elastic shields — for protecting the working space from collapsing lateral rocks during mining of steeply dipping seams. However, the application of known rigid and elastic shields is greatly complicated under conditions of varying thickness of the formation.

The proposed metal overlap differs from the known ones in that the width and length of it can vary and as a result, the overlap can be adapted, in particular, to the varying thickness of the formation being worked.

FIG. I depicts a development system in longitudinal section along A-A in FIG. 2; in fig. 2 is the same in cross section along BB in FIG. one; in fig. 3 is the same, in section along E-B in FIG. one; in fig. 4 - overlap structures.

A powerful steeply dipping coal seam at the level of the ventilation flap / overlaps along the whole power with a flat metallic semi-rigid ceiling 2, which in the process of excavation underneath the coal is at an angle of 25-40 ° to the horizon. The excavation of the coal under the overlap is made of special ditch passages 3 located under the rigid links of the beam 4 of the overlap 2.

At the same time, the construction of an additional attachment under the overlap is not required, since the rigid links of the beam 4 rest on the pillars of the 5th angle, which provides the necessary free working space and safety of work in the decals. Directly above the supporting pillars 5 are elastic links — steel ropes 5 of overlap 2, by means of which rigid overlapping links are connected.

The coal repulsed with explosives or jackhammers with its own weight descends along the base of the ditch passages 5 and of the cross-inclined ort 7 into the coal drainage wells 8, through which I go to the haulage I where it is loaded into trolleys. As the angle overlaps descends, it reaches the base number 92852

where it is dismantled at point 10. The overlap in point // is mounted.

The coal wells 8 are drilled from the haulage drift, and the running ventilation furnaces 12 are drilled from the first parallel drift. When coal is excavated using drilling and blasting operations, in the middle of the height of the floor, at the side of the recumbent side, another sublevel drift 13 is carried out to ensure better ventilation of the working faces.

The overlap 2 is a semi-rigid metal frame, consisting of I-beams 4 with a length of 3 m, arranged in rows 1 m apart from each other (along the strike). These beams are interconnected by steel ropes 6 with a diameter of 18 mm, and along strike are ropes 14 with a diameter of 28 mm. To prevent a breakthrough under the overlap of the collapsed rocks of the cable-beam frame, it is covered on top with a cable or wire mesh 15 attached to the frame with brackets 16 and nuts 17. To secure the hard links to block more stability, support brackets 18 in the middle of the beams are used.

The overlap design allows it to be resized in width due to the contraction of elastic links — up to 30% of the total overlap width.

The installation of the ceiling on the upper horizon, the cleaning work and the dismantling of the ceiling on the horizon are carried out simultaneously and independently of each other.

Excavation of the coal under the overlap is carried out by successive recesses of the ditch passages and disassembling for the same amount the upper parts of the supporting pillars. Each pillar, bounded by furnaces, is removed independently of the adjacent.

Overlap control is accomplished by increasing or decreasing the thickness of the layer removed by it in one cycle. At angles of incidence below 70 °, the coal shall be dredged in the order shown by dotted line 19, i.e., so that the deepening of the gangways and disassembly of the supporting pillars are in the direction from the recumbent side of the seam to the top. In this case, the overlap will move in a wave-like manner from the lying to the lateral layer.

Subject invention

Metallic overlap to enclose the working space of the cleaning slab from collapsing lateral rocks, characterized in that, in order to ensure the possibility of adjusting the width and the length of the overlap, it is composed of separate metallic rigid links interconnected in the middle of the strike and the strike of the formation with steel cables.

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