SU93415A1 - Shield system for the development of powerful steeply dipping coal seams - Google Patents

Description

As is known, in practice, the so-called shield system for the development of powerful coal-bearing seams of coal has become widespread. According to this system, the field is divided into excavation areas, which, in turn, are developed by separate pillars. The pillars of the coal are left between the pillars; in each pillar, furnaces are conducted to the entire height of the floor; In the cut (horizontal layer on the entire thickness of the formation), a shield is mounted on the ventilation horizon, under the protection of which coal is dredged (by blasting), lowered by gravity over the furnaces to the horizon of the main plate. The shield descends following the movement of the bottom under the influence of its own weight and the pressure of the overlying crumbling rocks.

However, the described switchboard development system has a major drawback - the coal pillars left between the pillars and high losses of coal represent a great fire hazard. Therefore, it is highly advisable to implement a shield system of development without leaving coal pillars between the stations.

This invention is achieved by the present invention by the fact that the development is carried out not with the collapse of the leaching rocks, but with the laying of the developed space above the shield overlap. At the same time, a shield has been applied, the design of which ensures the protection of the space from the penetration of a bookmark from the side of a forgotten developed space.

In (Fig. 2b), the scheme of the proposed development system is shown; Fig. 2 shows a section through L.4; Fig. 3 shows a section through BB; Fig. 4 shows a section through CENTURIES; Fig. 5 - section through GG ; in Fig. 6 - a section along the DD; in Fig. 7 - a section along the EE; in Fig. 8, 9 and 10, the device of the proposed shield is shown.

The main cross-section / double-track section is paired with the first parallel gate 2. These cross bars are knocked together by furnaces 3. To ensure the ventilation of the section along the axis of the precinct cross-section 4, the ventilation well is being drilled from the first parallel cross section with a drilling machine, which is expanded and equipped with a central hole, which is expanded and equipped with a central hole, which is expanded and equipped with a central bore, which is centrally drilled, and a central well is drilled, which is centrally located. a ventilating furnace 5. Two drifts 6 and 7 are paired below the level of the upper, spent horizon, of which the upper 6 is a cut-edge entrenching upper border of the excavation site weaving, and the bottom 7 - mounting, designed for mounting scnta.

The cutting works on the section are carried out by drilling the wells of the furnaces 6 for the entire height of the floor, from the main drift to the trimming drift 6, with ate the food from the wells / to the section of the coal drain and ventilation furnaces.

To ventilate the clearing flue between the fourth and fifth furnaces, counting from the boundary of the site, sboki 9 are performed. The same sluggishness as far as rifled openings are made P130 is between adjacent furnaces, every three furnaces.

In order to ensure that the filling material in the recumbent side of IoTasta feeds into the development of the space at the level of the main sections of the upper horizon, a zero guitar 0 is held parallel to the section. Field drift 10 is used to install a tabbed transport in it.

If a thin coal seam is deposited in the soil of the reservoir being developed at a distance of up to 8 m, then this reservoir can be used to navigate through the filling tunnel (instead of the field one). Field field track JO is knocked out with a cut road 6 inclined under the fragile 45 tuskami 11, pre-destination for descent of the backfill material through them into the developed space.

The collapses 11 are located on the continuation of the line of the axes of the nitre furnaces 8. In this case, both the furnaces 8 traversed by the coal and the rocks of the coupling 11 are passed as the columns are worked out within the time required to prepare the new extraction column.

The reservoir mining within the excavation area is carried out in separate strips or pillars with a coal notch in the fall.

The size of the strip to be removed along the strike is assumed to be 24. ".

The first strip or pole, detachable in the pillars, is produced by means of a conventional shield panel, consisting of four sections (but 6 meters each). The subsequent poles are processed using the proposed shield panel.

After all the preparatory workings have been performed on the excavation site and the furnaces and rock formations have been driven with a field drift 10 for the first pit column, the MOHI coal mining area has been cut (cut) on the edge of the edging track and track 6 and on the horizon of the installation track 7. Upper cut it is fastened with a special reinforced stropion fixture 12 (Fig. 6) and a polisher with a thick crotch of the forehead and sides. After the upper dissection and installation in 1p: the excavation is performed and the excavation between these dissections is carried out to the entire thickness of the formation, and this irradiation is fastened with lavish circles on the headers with heavy strength kragzli and soil formation odiorezkoy.

The production of cut formations, excavation of the pillar and fastening of the working space is carried out in separate sections corresponding to the length of the idit section, i.e. 6m.

By carrying out all the installation of the shield, cutting the coal over the shield and unfastening the supra-idite prostration with a special fastener, the preparation of the shield column for the cleaning groove is completed. A 4-4.5 m high space specially formed over the entire thickness of the reservoir formed above the shield overlap is intended to receive backfill material into the space developed above the shield and will be the so-called bunker. The fastening of the upper part of the shield column is provided with a special support and the rock-receiving bunker has

its goal is to ensure the sustainability of the weakest part of the exposure in the space being worked, within which there will be an alternation of complete blacking out. masonry material and the partial temporary release of this space from the bookmark during landing shield.

Outside the rock-receiving bunker, the entire developed supra-shield space 14 (Fig. 8) is constantly filled with stock material, which, as the coal is excavated, moves along with the descending overlap and creates a polybug of the main side rocks, thus hindering their lateral formations.

Supply of filling material is made from the field drift 10, passed in the recumbent side of the reservoir, through oblique rock bushing. According to the field gateway W, the bookmark is fed by a belt conveyor, and according to the glands 11 by gravity flow through iron sheets. Before the start of the cleaning works under the shield, the entire space of the receiving bz-nker is filled with filling material as much as the gravity feed method of the laying of the bookmark allows.

Thereafter, a cleaning recess begins.

The clearing is the same as for the shield system with collapse. Only the coal excavation in the part of the bottom 15 (Fig. 9), which is directly adjacent to the developed and forgotten space of the existing shield post, differs.

After each cycle of excavation (boarding) of the npiieMHbni, the bunker is replenished with stowing material.

The receiving hopper should be replenished systematically, without any breaks and backlogs, in order to prevent the filling level with the material below the fixed bunker space to decrease. The feeding material should be supplied with a powerful flow, which provides for quick space hobbing, after the bookmark precipitates as a result of landing.

To implement ydlagae yu

the development system offers a shield protecting the bottom-hole space from a breakthrough from the side of a neglected developed prostration. The end side of the sections of the ppt, facing the side of the scored worked-out space, is supplied with the teeth of the plasterboard Ifi (Fig. 8) from the rails. Teeth 16 is free to move, cuts in cages 17, npin peiilenny to channel end section. To prevent falling out of the sleeve, the teeth at the ends inside the sleeves have welded retaining washers, and the sleeves inside at 1 L from the upper end have stop flanges. Thus, the movement of the teeth under the action of the force is limited to 1 m, which corresponds to the received step of boarding the shield.

To reduce the power of the trip, between the end part of the sections and the tab, iron sheets are attached to the clips, from the outside, which will prevent the rocks between the clips of the base mass from falling between the clips.

Holes are drilled into the teeth x at a distance of P n 20 cm from the edge protruding from the holder, which are slate for pulling the tooth out of the holder if it is not automatically pulled out by force of gravity for some reason as it progresses.

The cleaning works under the shield start from the penetration of the axial ditch along the strike.

When approaching the ditch to the place of junction of the shield post with the built-in vyrabotanopanopin space, as the coal is disassembled, in the canape the ends of the teeth 16 recessed into the Alb 17 are pushed down and create a vertical grid enclosing the spent space of the previous shield post from the working wellbore space of the existing sewage treatment plant. The gap between the individual teeth is an eye of 15 cm, and therefore, in order to prevent the request to be inserted into the specified gap, the latter is overwhelmed with wooden tightening as the teeth protrude. If the teeth are not pulled out from the cage under the influence of their own weight in individual cases, they will be pulled out by force using a crowbar, which is pushed into the hole of the tooth.

After lowering the teeth over the cross section of the longitudinal ditch, the coal is cut from the ditch along the front side of the shield section to the sides of the lying and lying sides with successive lowering of the teeth and dragging them over the entire thickness of the shield. The dissection of the longitudinal ditch and the opening of the front side of the shield are carried out during one shift.

After that, the second shift is made to remove the coal from the ditch to the lying and hanging sides.

The coal is dredged under the tongue by drilling and blasting operations with the same sequence as in the development with a collapse.

The feasibility calculations performed show that the indicators of the proposed system exceed those of the most productive P1, which is a collapse system.

The proposed development system has the following advantages over known systems:

1. Conducting preparatory and rifled workings in the excavation site and coal mining technology. in the bottomhole, they generally differ little from the work performed when the reservoir is mined with a shield development system with collapse; therefore, the development of this system does not require a long time and special training of personnel.

2. In view of the fact that the bottomhole space and the mined-out developed space are separated by shield overlap, the simultaneous mining and storage of the spent space is achieved, which practically does not take place when working with other development systems. In other systems, work on coal has longer or shorter breaks, which are necessary for postfinding, lowering bookmarks and other operations.

3. To fill the space developed, the cheapest kind of bookmark is used - dry flowless tab, the use of which does not require the cost of acquiring expensive stowing machines and high power consumption.

Subject invention

Claims (2)

1. Shield system of development of powerful steep-coal coal seams, characterized in that, in order to carry out work without leaving the entire coal between processed m and pillars, processing is carried out with the laying of the developed space above the shield overlap. 2. The boarding overlap for carrying out the system. We are in accordance with claim 1, which is based on the fact that its section adjacent from the front side to the diseased space, in order to protect the bottomhole working space from breaking the tab, is provided with teeth that are pulled out of the cage. I I; || (IJ ... ( 1 I. (and II, and : p; - RSH 11 zs as Hi Jnll jnn jiULLQuUUDL UP jnunni iZlEIIllIIltlllCDC - c :: Disch v FIG. 3 Cut t 66 Fpg 2 Cut t yy PP FIG. 6 Cutting field, FIG. 7 Paifji} by HER