SU1684511A1 - Method for protecting seam working - Google Patents

Abstract

The invention relates to methods for protecting seam mine workings and allows reducing the appearance of dynamic bearing pressure on the supports of the trimmed organ row. Following the movement of the clearing in the mine, racks of the organ row are installed. A strip of rocks with a width of at least three squeezed capacity of the reservoir is reinforced by yutankers, onto which a metal tape is screwed. One end of the tape is fixed above the posts of an organ row of supports. Metal tapes are spaced from each other at a distance equal to half the width of the protected excavation. 3 il.

Description

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The invention relates to methods of protecting reservoir mines with retention for reuse in the development of coal deposits.

The purpose of the invention is to reduce the occurrence of dynamic bearing pressure on the supports of the organ row.

FIG. 1 is a diagram of an embodiment of a method for the protection of formations; in figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1.

The technology for protecting seam mining is as follows:

In the downhole 1, coal was excavated under the sections of the mechanized support arm 2. Simultaneously with the advance of the clearing face, the retained formation was formed 3 behind it. After

dredging the next coal chips in the longwall 1 to advance the sections of the tarmac mechanized support 2 in the gap between its overlap and the longwall in the roof of the reservoir, drill a row of boreholes, then install anchors 4, 5, for example, with mechanical or chemical fastening depending on the geological conditions.

A metal tape 6 is placed on the ends of the anchors 4, 5 and secured with a nut. Hardening is subjected to a strip of roof rocks, the width of which (the length of metal tapes) but must exceed the value determined by the formula

I - 3 m

cos a where m is the reservoir output, m;

About 00

ate

a - dip angle, degree

The length of the metal tape is determined on the basis of the patterns of the collapse of the immediate roof behind the lining of the clearing face. On the basis of studies on models of equivalent materials, it was established that the direct roof hangs on the interface of the lava with the haulage. The roof collapses directly behind the lava support at some distance from the haulage.

The bottoms of the metal tape to the kropla are used with anchors A 0.5–1.0 m long, since their purpose is to retain only the adhesion of the tape to the collapsing lower layers of the roof. Anchor 5 with a length of 1.8-2.0 m is used to secure the end of the metal tape 6 located above the cut (organ) row of support 7.

Metallic tapes b are located at a distance equal to half the height of the preserved output 3, but a multiple of the number of coal chips removed by the combine in the clearing bottom, which is defined as ensuring connectivity of the rock-metal strip (i.e., the collapse of the roof layers on adjacent metal lanes should occur together) and the technological conditions of installation of the tape (only after removing the coal chips).

Stored output 3 is fastened according to the fastening passport, for example, with the installation of trunnion trunnion rack 7 and tops fixed by means of anchors.

The mechanism for forming the flexible rock strip 8 is as follows.

As the clearing of the slaughter, 1, the exposed rocks of the roof set in motion. The collapse of the rock layers begins. Moreover, at the interface of the clearing indentation 1 with the drift 3, the rocks hang up due to the increase in their stability provided they rest on the edge of the reservoir along the chest of the clearing inment 1 and the cut organ row lining 7. The fastening with the metal tape 6 of the lower layers ensures their separation and collapse on the soil more intensely because the load from

The weights of the separated layer are transmitted through the metal strip 6 and the anchors 4 to the sections of rocks located closer to the drift 3, and cause their forced collapse. The collapsed rock band 8, fastened with a metal tape b, hangs on a firmly fixed anchor 5 above the trimmed organ row 7, i.e. A flexible rock band 8 is formed, protecting the protected drift 3 from impacts of jumping pieces of rock 9.

The advantage of the method over the known one is that the rock band 8 is flexible, falling on the ground and dependent on the side of the retained excavation on the long anchor 5, prevents the collapsed pieces of rock from rolling down into the drift 3 due to its lowering on the ground directly behind the lining of the clearing flank, and also provides greater stability of the supports of the organ row and, consequently, increases the efficiency of preserving production.

Claims (1)

Invention Formula The method of protection of reservoir mine workings, which includes the installation following the movement of the clearing face and supporting the organ row and hardening by anchors of a strip of crushed rocks located directly behind the trimmed row of supports, characterized in that, in order to reduce the occurrence of dynamic bearing pressure on the supports of the organ row, the strip of breaking rocks is additionally reinforced with metal tapes of at least three removable reservoir thickness, which are hemmed with anchors, while one ends of the metal bands are fixed above the posts organ p yes lining in indestructible rocks. I FIG { Fig 2 BUT mendslkadado FIG. 3