RU2344293C1 - Method of development of steeply inclined coal beds of medium thickness between hitches - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention refers to development of steeply inclined coal beds of medium thickness with long pillars along course of bed extracted by strips along pitch. The method is implemented between hitches and includes preparing an extraction pillar by leading transport (1) and ventilation (2) entries, contouring an extracting strip with coal (3) and ventilation chutes along the line of the bed pitch from the transport entry till ventilation entry on both sides of the strip; arranging assembly chamber 4 at ventilation entry 2, assembling therein sections 5 of a mechanised face support. Coal chute 3 is led on flank of the extraction pillar along the line of bed pitch from one side of the extracted strip. The first section 5 of the mechanised face support is assembled in the range of coal chute 3. Sections 5 of the mechanised face support are tied between them with thrusting jacks. At an initial stage of coal extraction a mining face is formed as a rise step entry; additional sections 5 of the face support are in turn assembled and put into operation. At a final stage the width of the extracted strip is limited and open area is separated from massif with a face support. A ventilation chute along the bed pitch from the counter side of the strip is arranged in its extracted space behind the last section 5 of the face support. Coal is extracted at each section 5 separately. Loose coal is transported along the mining face with transfer of transport flow from one extracting-transporting body to another using self-flow transporting from step to step.

EFFECT: increased efficiency of coal extraction.

3 dwg

Description

The present invention relates to mining, in particular to the development of steeply inclined coal seams of medium power 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 steeply inclined coal seam by an aggregate along a shield system, including preparing a excavation column by conducting drifts, preparing a excavation strip by conducting a running, ventilation and coal-releasing furnaces, holding a mounting chamber and installing cleaning equipment in it, mechanized excavation of coal under a shield protecting support and transporting it along the bottom with a conveyor belt, gravity transport of coal to the transport drift and airing the working face in seconds is obscheshahtnoy depression [2].

The disadvantages of the prototype are:

- the need to maintain the straightness of the face to ensure not only coal mining, but also its transportation along the face, and this, in turn, requires additional time and labor;

- increased volume of conduct and subsequent maintenance of preparatory workings;

- a fixed length of the working face, due to the passport length of the treatment unit, on the one hand, limiting the scope of the method to formations in favorable mining and geological conditions, in particular, without geological disturbances, on the other hand, requiring the straightness of the workings determining the width of the excavation strip.

These shortcomings, in our opinion, reduce the efficiency of the development of steeply inclined coal seams of medium power.

The purpose of the invention is to increase the efficiency of coal extraction from steeply inclined formations of medium power by extracting reserves of a section of the formation between mining and geological disturbances by changing the length of the working face depending on the width of the section.

This goal is achieved by the fact that in the method of developing steeply inclined coal seams of medium power, including preparing the excavation column by conducting transport and ventilation drifts, contouring the excavation strip with carbon drain and ventilation slopes along the dip line from the transport to the ventilation drift on both sides of the strip, holding the mounting chamber at ventilation drift, installation of mechanized roof support sections in it, mechanized coal extraction and forced transport of broken coal to the length of the working face by the transport executive body, gravity transport of coal to the drift and protection of the bottom hole from rock penetration by the shield sectional support, the coal slope along the dip line on the side of the excavation strip is carried out on the flank of the extraction column, the first section of the mechanized roof support is installed in the alignment coal slope, mechanized roof support sections are connected with each other by jacks of movement, in the initial stage of coal extraction, the mine face is rebelled They have a concession shape and at the same time additional support sections are mounted and put into operation, in the final stage the width of the excavation strip is limited, the worked space is separated from the untouched mass by the support, a ventilation slope along the line of formation fall from the opposite side of the strip is constructed in its worked out space behind the last section lining, coal extraction is carried out separately at each section, the transport of broken coal along the working face is carried out with the transfer of the transport stream from one excavation unit Sportna authority to another using the gravity transport from one ledge to another.

The invention is illustrated by drawings. Figure 1 shows a diagram of the preparation of the excavation column for mining strips in the fall in the area between mining and geological disturbances (plan view); figure 2 - layout of equipment in the face (cross section); figure 3 is a diagram of the formation of the inferior form of the face, the completion of the formation of the length of the face and the design of ventilation workings on the other side of the excavation strip (plan view).

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. At the ventilation drift 2, a mounting chamber 4 is built, in which the sections of the lining 5 of the working face are mounted, starting from the pair with the slope 3, orienting them in the direction of fall, and the first section is mounted in the alignment of slope 3. Each section of the lining 5 (except the first) is structurally associated with excavating and transport executive body, made in the form of an arrow 6, equipped with a screw 7 with teeth. The lining sections 5 are connected with jacks of movement. In this case, the initial number of sections (length of the working face) can be taken based on the actual installation speed of subsequent sections.

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 and then the ventilation drift 2.

In the initial position, sections 5 are installed in line. The extraction of coal is as follows. First, the lining of the ramp 3 is dismantled in a section below the first section of the lining with a length equal to the step of moving the lining section, and the first section is moved along the dip of the formation. Then the executive body of the second section beat off the coal and move it. The beaten-off coal is transported by the executive body of the second section to the coal slope 3 and then flows by gravity to the transport drift 1. At the end of the described cycle, the first section is again moved down the dip, forming an inferior form of the face. Then again move the second section, and then the extraction and transportation of coal in the third section, etc. In this case, coal beaten off in the excavation zone of the third section is transported by the executive body of this section to the excavation zone of the second section, and from there by the executive body of the second section to the cargo compartment of the ramp 3. After moving the first, second and third sections, the fourth section is launched and so on. .d. until a geological violation is detected in the mounting chamber 4, which is insurmountable by these means of mechanization. Depending on the predicted form of manifestation of this mining and geological disturbance within the boundaries of the site, a decision is made to limit the increase in the length of the working face. In this regard, the installation of new sections in the installation chamber near the zone of manifestation of the mining and geological disturbance is stopped, and after moving one or two of the last sections, one or two organ rows 8 are punched, thereby limiting the collapse zone of the roof rocks in the worked out space of the strip to be removed. In the developed space between the organ row and the coal mass from the side of the identified mining and geological disturbance, a lining is erected, thereby constructing a ventilation mine 9, which is also intended to organize an emergency exit from the face.

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 9 and then ventilation drift 2.

After the first section has worked out its strip excavation zone (as well as the subsequent ones), it is dismantled and, after routine inspection and repair, is sent for installation in a new place.

By eliminating the rectilinear shape of the face and giving it an inferior shape, the conditions for transporting the beaten coal are improved, since the transfer of the beaten coal from the executive body of one section to the executive body of the other section is carried out using gravity forces.

By raising the ledges of the working face away from the flank slope, the conditions for ventilation of the working face are improved due to the mine depression, as the air moves upward all the time.

Due to the gradual commissioning of new sections, structurally connected with the extraction and delivery machine, the need for coal-run wells is eliminated, which reduces the breakdown accident rate, since it eliminates their clogging, and, consequently, the loss of time and labor to drill.

This method does not require preliminary conducting ventilation workings along the dip line, which significantly reduces the specific volume of preparatory workings.

This method allows you to dial any length of the working face depending on the distance between geological disturbances and remove coal reserves that are not currently included in industrial, due to the fact that there is no technological support for their extraction.

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

Information sources

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

2. Integrated mechanization and automation of sewage treatment in coal mines. Under the total. ed. B.F. Bratchenko. M .: Nedra, 1977, p. 151-153, fig. 3.57 (prototype).

Claims (1)

A method for developing steeply inclined medium-thickness coal seams between faults, including preparing a mining column by conducting transport and ventilation drifts, contouring a mining strip with carbon slopes and ventilation slopes along the dip line from the transport to the ventilation drift on both sides of the strip, holding an installation chamber at the ventilation drift, installing sections of mechanized lining, mechanized excavation of coal and forced transport of chipped coal along the face by a self-transporting executive body, gravity transport of coal to a drift and protection of the bottom hole from rock penetration by a panel sectional support, characterized in that the coal slope along the dip line on one side of the excavation strip is carried out on the flank of the extraction column, the first section of the powered roof support is installed in in the slope of the coal slope, the sections of the mechanized roof support are connected with each other by jacks of movement, in the initial stage of the extraction of coal, the mine face is given a rebellion yaw form and at the same time additional sections of lining are mounted and put into operation, in the final stage - they limit the width of the excavation strip, separate the worked-out space from the untouched mass of lining, a ventilation slope along the line of falling of the formation from the opposite side of the strip is built in its worked out space after the last support section, coal extraction is carried out separately at each section, the transport of broken coal along the face is carried out with the transfer of the transport stream from one excavation a sports body to another using gravity transport from one ledge to another.

Images