Method of isolation of emergency section of underground mine working

FIELD: mining.

SUBSTANCE: method includes well drilling between surface and roof of underground mine working, delivery of hardening material to the mine working in case of emergency situation related to coal fire breeding. Section of underground mine working is driven in the place of isolating barrier wall erection; height of mine working is increased towards the middle of the section. Well is drilled between ground surface and point of maximum height of underground mine working. Hardening material is delivered to the mine working till mine working section driven with various height is completely filled. Maximum height of mine working in the middle of this section is determined by expression hmax≥hb+tgφ·b/2h where hmax is maximum height of underground mine working on the section of isolation barrier wall erection, m; hb is height of underground mine working outside the section within which isolation barrier wall is erected, m; φ is angle of hardening material spreading, degrees; b is width of underground mine in the rough, m.

EFFECT: improving reliability of emergency section isolation during underground fire.

2 dwg

 

The invention relates to mining and can be used to isolate the emergency operating mines coal mines with underground fires.

There is a method of isolating an emergency site with underground mining, including drilling and construction in the movement path of the fire insulated jumper by what formwork operate as parts of interconnected fabric membranes, which serve in mining production through the well and carry out their filling in mines filler sequentially one after the other with their subsequent freezing in the collar with liquid nitrogen (patent RU №2066772, publ. 20.09.1996).

A disadvantage of the known technical solutions in the complexity of the proposed method (form in a multitude of fabric membranes, the device for their transportation, the presence of cryogenic freezing crowns).

There is a method of isolating an emergency site with underground mining, including the well casing, through which the drilling machine and the material of the pipeline serves a closed collapsible formwork, mounted on the end section of the pipeline, which is filled with compressed gas and a filler, first served fly ash (up to 2/3 of the volume), and then intumescent powder composition with water (patent RU No. 2052128, publ. 10.01.1996).

<> The disadvantage of this method is that for the implementation of the method requires strong foldable closed casing, feed capsule a source of compressed inert gas, which complicates the isolation of the faulty section of the mine.

There is a method of isolating an emergency site in underground development, adopted for the prototype. The method includes drilling between the surface and the roof of the underground workings and construction in the movement path of the fire insulating barrier jumpers feeding into the production of insulating filler with intumescent component, and the escalation in the production of insulating filler is produced by simultaneously applying to the ejector device located at the end of the casing wells, the bulk material and plating through the drilling rod fine foaming solution or liquid hardener with ejection while mine atmosphere emergency area with low oxygen content to atomize the flow of granular material, and on one of the channels ejector device fix inflatable fabric rod activator bortovoy styling body insulating barrier jumpers (patent RU No. 2150585, publ. 10.06.2000).

A disadvantage of the known technical solutions in the complexity of the proposed method: enter in the upper part of making spray for submission is penoobrazovatel, the creation of calibrated channels for supplying the dry mixture, the flow in mountain development inflatable fabric rod activator. Mnogovershinnoe runs without human presence, which is a cause of low reliability. In addition, tissue core activator made of vozduhoplavateley tissue may be destroyed during the construction of bridges, what is the cause of low reliability.

The technical result is to increase the reliability of insulation of an emergency site with underground fires and the reduction of the hardening material.

The technical result is achieved in that in the method of isolating a damaged part of the underground mine, including the drilling of wells between the earth surface and the roof of an underground excavation, filing in the development of hardening of the material in the event of an emergency associated with the combustion of coal, underground mine workings at the site of erection insulating barrier jumper are of different heights development, which gradually increase when approaching from the boundaries of this parcel to the middle, the well is drilled between the earth's surface and the point of maximum height of the mines, while the flow in the development of hardening of the material produced before full hardening filling material phase is developing, covered with different height and the maximum height of production in the middle of this area is determined from the expression

hmax≥hin+tgφ·b/2,

where hmax- the maximum height of the underground mine workings at the site in the place of erection of the insulating barrier jumpers, m;

hin- the height of the underground workings at the boundaries of the site within which to erect an insulating barrier jumper, m;

φ is the angle of spreading of hardening material, deg;

b - width mines in the rough, m

Way to isolate the faulty section of the underground workings in the development of coal seams is presented in figure 1, 2. Figure 1 shows the plot develop, passed with different height. Figure 2 - cross section production line A-A. In figure 1, 2 shows: 1 - the underground excavation; 2 - site generation l passed with different height; 3 - arched pliable lining; 4 - delay; 5 - bolting; 6 - well.

The essence of this method consists in the following. Insulated underground production 1 to emergency situations (fire on the alleged plot) at site 2 is carried out with a different height that gradually increases when approaching from the borders of this area to its middle (figure 1). The fastening section 2 exercise arched pliable lining 3 with 4 and tightening the ANC is nuclear biological chemical (NBC lining 5. Location of site 2 is chosen according to the emergency response plan so that after erection at the specified location insulated jumper to isolate the plot, which may result in fire hazard. The maximum height of production in the middle of this area is determined from the expression

hmax≥hin+tgφ·b/2,

where hmax- the maximum height of the underground mine workings at the site in the place of erection of the insulating barrier jumpers, m;

hin- the height of the underground workings at the boundaries of the site within which to erect an insulating barrier jumper, m;

φ is the angle of spreading of hardening material, deg;

b - width mines in the rough, m

In case of fire between the earth's surface and the point of maximum height of underground production drill hole 6 (Fig 1, 2) and submit to the elaboration of a hardening material to fill hardening material section l trip generation with different height (figure 1).

This condition will allow to block the production of the insulated rapid hardening concrete for the path of fire across its width.

The use of this method of isolation emergency area with underground mining of coal seams will improve the reliability of the isolation of the emergency area when s is zemnyh fires, and reduce material and labor costs.

Way to isolate the faulty section of the underground workings, including the drilling of wells between the earth surface and the roof of an underground excavation, filing in the development of hardening of the material in the event of an emergency associated with the combustion of coal, characterized in that the area of the underground mine workings at the site of erection insulating barrier jumper are of different heights development, which gradually increase when approaching from the boundaries of this parcel to the middle, the well is drilled between the earth's surface and the point of maximum height of the mines, while the flow in the development of hardening of the material produced to fill the solidifying material of the site of generation, covered with various height, and maximum height of production in the middle of this area is determined from the expression
hmax≥hin+tgφ·b/2,
where hmax- the maximum height of the underground mine workings at the site in the place of erection of the insulating barrier jumpers, m;
hin- the height of the underground workings at the boundaries of the site within which to erect an insulating barrier jumper, m;
φ is the angle of spreading of hardening material, deg;
b - width mines in the rough, m



 

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FIELD: mining.

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EFFECT: increase of reliability of emergency area isolation at underground fires and reduction of material and labour costs.

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4 cl

FIELD: blasting.

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1 cl, 1 dwg

Fire barrier // 2323342

FIELD: mining, particularly devices to localize methane and/or coal dust explosion and to suppress underground coal mine fires caused by methane and/or coal dust explosions.

SUBSTANCE: fire barrier is freely installed so that it may be displaced in both directions from vertical line. The partition is suspended inside recess made in upper mine part and is connected to flexible tie provided with fixing means. The flexible tie passes over pulley with fixed axle and over deflecting roll and is connected with retaining lever. The first lever side is supported by deflecting toll. Another end thereof is secured to rod of explosion indicating flag. The rod has figured groove made as turning.

EFFECT: increased rate of blast wave propagation suppression and explosion site isolation.

2 dwg

FIELD: technical physics, blasting operations, applicable at development of various protective structures designed for restriction of the blast destructive action, reduction of the blast load and protection from fragments on the end face walls of channels, as well as for localization of the explosion products containing harmful aerosols.

SUBSTANCE: the explosion-proof shield of the end face wall channel represent and obstacle separating the channel into the explosive space and the buffer space restricted by the end face wall with provision of communication of the explosive space with the buffer one. The obstacle is made composite at least of two components installed for longitudinal motion along the channels axis. Communication of the explosive space with the buffer one is provided due to the shift of the obstacle components relative to each other along the channel axis. An case when the explosion process is accompanied by formation of high-speed fragments, a gap may be absent in the projection to the cross-section of the channel between the obstacle components. The obstacle components in the explosion-proof device forming the protective shield may be made of destructible materials that can form of cloud of dispersed suspension at and influence of the blast load.

EFFECT: reduced level of destructive action of the explosion associated with the blast load on the channel end face walls due to the reduced amplitude of the blast load, in particular cases provided protection of the wall against high-speed fragments, as well as a reduced contamination area by harmful substances (dust, aerosols and gaseous products) in case of an accident.

3 dwg

FIELD: mining industry, construction.

SUBSTANCE: in composition for erection of isolating structures, having cement, ash, backfill, softener and water, ash is used in complex of cement-ash binding agent in amount of 19-22% of its mass, as softener mineral-chemical admixture of special brand is used, and as backfill - sand, while components are taken in following ratio, in percents of mass: cement-ash binding agent - 20-25, mineral-chemical admixture of special brand - 0.2-0.4, sand - 41-46, water - the rest till 100.

EFFECT: higher durability.

2 tbl

FIELD: mining industry.

SUBSTANCE: wall has caved-in rock, being in passage with cuts and fully closing the latter, which is formed by prior driving of a fan of coupled ascending drifts, loading charges therein and detonating the latter in order from ends of fan to its center. In rock before wall two mated side horizontal dead-end tunnels are made at sharp angles ±40÷60° to direction of air strike waves and with cross-section area, equal to area of main passage cross-section, and with length 5÷15 of dimensions of passage width. On the side of approach of air strike wave angles of mating surfaces of protected passage and dead-end tunnels are made rounded. After protection from air strike wave and providing for possible crossing of passage rock of wall is stored in horizontal dead-end tunnels.

EFFECT: higher efficiency, lower costs.

2 cl, 7 dwg

FIELD: mining industry.

SUBSTANCE: heat waves suppression device consists of mine channel with well sections made therein. Each well of section is provided with conic aperture at entry into rock, and at end of well - by chambers for destroyed rock, remote from each other and from longitudinal channel axis. Each section of channel wells is made with saw-like surface, projections of which are directed against possible direction of air strike wave. In recesses of sections conical apertures are positioned, from which wells are placed at sharp angle ±(10÷70°) to direction of air strike wave.

EFFECT: higher efficiency and durability.

1 dwg

FIELD: mining industry.

SUBSTANCE: heat waves suppression device consists of mine channel with well sections made therein. Each well of section is provided with conic aperture at entry into rock, and at end of well - by chambers for destroyed rock, remote from each other and from longitudinal channel axis. Each section of channel wells is made with saw-like surface, projections of which are directed against possible direction of air strike wave. In recesses of sections conical apertures are positioned, from which wells are placed at sharp angle ±(10÷70°) to direction of air strike wave.

EFFECT: higher efficiency and durability.

1 dwg

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