RU2360115C1 - Stripe-along-pitch method of development of thick steeply inclined coal bed - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method consists in preparing extraction pillar by driving transport and ventilation entries, in delineation of extracted stripe with coal chutes and air shafts along bed pitch line from transport to ventilation entry on both sides of stripe, in driving assembly chamber at ventilation entry, in constructing sections of powered roof support in assembly chamber, in mechanized mining of coal in step-like mining face in two layers, in forced transporting of coal along face and self-flowing transporting from upper layer to lower one and from step to step to transport entry, and in ventilating mining face by all-mine depression. Working space under each section of support is profiled with insignificant advanced mining of coal in the lower layer and with leaving temporary support massif at the support of the bed in the upper layer extracted before displacing sections of support at the final stage of extraction of the stripe of each section. The boundary of the upper layer is profiled along arc equal to radius of turn of a panel ceiling. An outlet opening is cut from working space of the lower layer of the extracted stripe to the transport entry limiting its height by the height of transport position of the support section. The section of the support is driven to a transport position, further it is removed to the transport entry through the outlet opening, and the outlet opening is backfilled with materials not subject to repeated utilisation.

EFFECT: increased efficiency and safety of development.

5 dwg

Description

The present invention relates to mining, in particular to the development of powerful steeply inclined coal seams with long columns along strike, taken out by strips along the dip.

An analogue of this method is the development of steeply inclined coal seams according to the so-called shield system, in which the extraction pillar is prepared by conducting ventilation and transport drifts, running, ventilation and transport furnaces, and an installation chamber. A sectional shield is mounted in the mounting chamber and then cleaning operations are carried out under the shield using drilling and blasting operations and mechanization means for delivering broken coal along the face to the coal-blasting furnace [1]. The disadvantage of this method is the increased volume of preparatory workings, as well as the use of drilling and blasting operations, which in themselves are dangerous for humans and affect the massif, causing collapse and clogging of coal-hole wells, i.e. - breakdown accident rate.

The prototype adopted a method of mechanized development of a powerful steeply inclined coal seam in a shield system, including mechanized excavation of coal in a ledge-shaped face under a mechanized roof support in two layers, the organization of gravity transport of chipped coal from a layer at the top of the layer to the working space of the layer near its soil, and forced transportation along slaughter of a layer near the formation soil and gravity transport of coal to a transport drift [2]. The disadvantages of the prototype are:

- the use for the organization of gravity transport of beaten coal to the transport drift of an unsecured output — a coal-run well, which increases the accident rate of the bottom due to its blocking by transported coal;

- increased complexity of the withdrawal of lining on the transport drift to ensure the possibility of its reuse and the risk of breakthrough of collapsed rocks from the worked out space to the drift,

These shortcomings, in our opinion, reduce the efficiency and safety of developing powerful steeply inclined coal seams.

The purpose of the invention is to increase the efficiency and safety of coal extraction from powerful steeply inclined seams by changing the profile of the working space under each section of the lining and holding the collapsed rocks in the worked out space of the excavation strip.

This goal is achieved by the fact that in the method of developing a powerful steeply inclined coal seam, including the preparation of a mining column by conducting transport and ventilation drifts, contouring of the excavation strip with carbon drain and ventilation slopes along the line of falling of the formation from the transport to the ventilation drift on both sides of the strip, holding the mounting chamber at the ventilation drift, installation of mechanized roof support sections in it, mechanized coal excavation in a two-layer step-like treatment face, solid coal transport along the face and gravity flow from the upper layer to the lower one, from the ledge to the ledge and to the transport drift and airing the face due to mine depression, the coal slope is carried out on the flank of the excavation column near the formation soil and the face is given a rising face; the working space under each lining section is profiled slightly ahead of the coal excavation in the lower layer and leaving a temporary support pillar at the top of the formation in the upper layer, which is removed before moving the lining section; at the final stage of excavation of the strip of each section: the boundary of the upper layer is profiled along an arc equal to the radius of rotation of the shield covering; from the working space of the lower layer of the excavation strip, an exit window is cut into the transport drift, limiting its height to the height of the transport position of the lining section; the lining section is moved to the transport position, it is led out through the exit window to the transport drift, and the exit window is clogged with materials not to be reused.

The invention is illustrated by drawings. Figure 1 shows a diagram of the preparation of the extraction column and the extraction strip for mining (plan view); figure 2 - layout of equipment in the face (cross section); figure 3 is a profiling diagram of the face of the upper layer and the cutting of the "window"; figure 4 is a diagram of the translation section lining in the transport position; figure 5 is a diagram of the clogging of the "window".

The method can be implemented as follows. The extraction column is prepared by transport 1 and ventilation 2 drifts. At the far border of the pillar (on the flank), a slope 3 is carried out near the soil of the formation, having a running and coal-discharge compartment. The width of the excavation strip is limited by holding a ventilation slope 4 at the soil layer. In the space between the slopes 3 and 4 at the ventilation drift 2, a mounting chamber 5 is carried out in which the shield sections of the lining 6 of the working face are mounted, orienting them according to the fall. Each lining section 6 from the face of the face is structurally associated with two excavating and transporting executive bodies 7 (upper layer) and 8 (lower layer), made in the form of an arrow equipped with a screw with teeth, and from the obstructed side they protect from mechanical stresses with two layers of knurling 9 (it can be a wooden beam, round wood or other damping material that cannot be removed and reused). In this case, the elements of the knurl are interconnected by a flexible connection and a similar connection - with the shield guard of the lining section. Lining sections 6 are interconnected by jacks of movement

In the initial position, sections 6 are installed in line. The extraction of coal is as follows. First, the executive body 8 of the first section, installed near the ramp 3, remove the coal in the lower layer and the same executive body transport the beaten coal along the face to the coal slope 3. Then, the coal is extracted in the upper layer by the executive body 7, while ensuring some lag of the upper face layer from the bottom of the bottom layer. The beaten-off coal from the upper layer flows by gravity into the working space of the lower layer, where the executive body 8 goes to slope 3. A small support pillar 10 is left at the top of the formation, after which the first section is moved to the step of moving, laying the console of the shield guard on the support pillar 10. Then in the same way, in the same section, coal is taken out to the second step of moving and then the second support section is put into operation, thereby forming an inferior form of the working face, ascending from slope 3 to ventilation slope 4. At the same time, rabble, chipped in the second section of the strip zone surrenders its executive body 8 in the first section of the strip zone and has its lower executive body guided in chute 3. Further run similarly remaining section of lining. The developed space behind the roof support sections is filled with rock, for example, roof collapse.

The ventilation of the working face is carried out due to the mine depression: transport drift 1, slope 3, working space of the working face, ventilation output 4 and then ventilation drift 2.

When approaching the lining section to the transport drift 2 proceed to the final stage of its work. The executive body of the upper layer profiles the working space by taking out the coal of the upper layer along an arc with a radius equal to the radius of rotation of the shield guard of the lining section, i.e. they take out only that part of the coal of the upper layer, which can interfere with the rotary shield guard when it is transferred to the transport position. The lower executive body cuts through the “window” 11 in the area of the excavation strip of this section of lining on the transport sling 1. Thus, a pinch is formed in the working space of the lining section, formed entirely by overhanging 12 and the soil of the formation. Then the lower and upper executive bodies are sequentially dismantled and the lining section is transferred to the transport position. To do this, the shield guard is rotated around the axis connecting it to the base. After that, the flexible connections of the shield guard with the knurl 9 are destroyed and the section is moved along the fall line, thereby introducing it into the “window" 11. Pinch 12 holds the knurl 9 in place, and the lining section is brought to the transport drift 1. As a result of the movement of the lash section, fix the knurling 9 falls on the soil of the layer in the narrowest place - the “window”, thereby it clogs and prevents the breakdown of collapsed rocks from the worked out space into the transport drift. After a routine inspection and repair, the lining section and its executive bodies are sent by three transportable units for installation in a new place.

Due to the successive transfer of the beaten-off coal from one ledge to the other towards the coal slope, the need for conducting a coal chimney well and transporting coal through it has disappeared. And this reduces the breakdown accident rate.

Due to a slight advance in coal extraction in the lower layer, the conditions of gravity transport of coal from the upper layer to the lower are improved.

Due to the profiling of the working space, it is possible to transfer the lining section to the transport position directly in the working face, and the organization of pinching in the area of each section and the clogging of the output "window" reduce the likelihood of a break in the crashed rocks from the worked out space of the excavation strip.

These circumstances indicate an increase in the efficiency and safety of the development of powerful steeply inclined coal seams, and this is the purpose of the invention.

Information sources

1. The technology of shield mining of coal deposits. / Kurlenya M.V., Zvorygin L.V., Lebedev A.V. - Novosibirsk: Science, Sib. Department, 1988, p.27, fig. 1.11 (analogue).

2. A method for developing a powerful steeply inclined coal seam. RF patent No. 2310751, publ. 11/20/2007, Bull. No. 32 (prototype).

Claims (1)

A method for developing a powerful steeply inclined coal seam with falling strips, including preparing a excavation column by carrying out transport and ventilation drifts, contouring the excavation strip with carbon drain and ventilation slopes along the formation fall line from the transport to the ventilation drift on both sides of the strip, holding an installation chamber at the ventilation drift, installation in sections of mechanized lining, mechanized excavation of coal in a ledge-shaped working face in two layers, forced transport of coal I am along the bottom and gravity - from the upper layer to the lower, from the ledge to the ledge and to the transport drift and airing the working face due to the mine depression, characterized in that the carbon slope is carried out on the flank of the extraction column near the formation soil and the recovery face is given an upward inferior shape , the working space under each lining section is profiled by slightly ahead of the coal excavation in the lower layer and leaving a temporary support pillar at the top of the formation in the upper layer, removed before moving the lining section, At the final stage of the excavation of the strip of each section, the border of the upper layer is profiled in an arc equal to the radius of rotation of the shield overlap, from the working space of the lower layer of the excavation strip, the exit window is cut into the transport drift, limiting its height to the height of the transport position of the lining section, the lining section is transferred to the transport position, it through the exit window to the transport drift, and the exit window is clogged with materials not subject to reuse.

Images