CN113944464B - Coal mining method of corner coal full-negative-pressure continuous miner - Google Patents
Coal mining method of corner coal full-negative-pressure continuous miner Download PDFInfo
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- CN113944464B CN113944464B CN202111576818.4A CN202111576818A CN113944464B CN 113944464 B CN113944464 B CN 113944464B CN 202111576818 A CN202111576818 A CN 202111576818A CN 113944464 B CN113944464 B CN 113944464B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/10—Air doors
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
Abstract
The invention discloses a full negative pressure continuous miner coal mining method for corner coal, belonging to the technical field of coal mining; the method solves the problems that full negative pressure ventilation cannot be realized in the underground mining and the yield is low when a continuous mining machine coal mining method is adopted in the corner coal resources, and comprises the following four steps: the method comprises the following steps of roadway layout of a crossheading, branch roadway layout of a stoping unit, mining of a stoping unit and mining of a corner coal section; the invention has flexible tunnel arrangement and higher resource recovery rate, completely cancels the air supply of a local ventilator during the stoping of the underground mining, avoids the ventilation air flow from returning to the stoping branch tunnel, and is beneficial to ventilation management and safety because the branch tunnel through hole is additionally arranged in the stoping unit; meanwhile, the coal mining method adopts a continuous mining machine and matched equipment to carry out roadway tunneling and mining and back mining, and the mining is integrated, so that the newly added personnel are fewer, the investment is relatively low, the coal yield is ensured, and better benefits are obtained.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a method for mining corner coal by a full-negative-pressure continuous miner.
Background
In the process of mining, the mine is influenced by geological conditions, mining modes, working face arrangement and the like, a large amount of corner coal resources are left, and due to the fact that the resources are small in area, dispersed and irregular, mining cannot be conducted by a conventional longwall fully-mechanized mining method. At present, in the recovery of corner coal resources, the main mining modes are as follows: short wall mining, filling mining, roadway mining, continuous miner mining and a combination of these. Many mining methods improve the resource recovery rate of the coal mine to a certain extent, but still have some problems, such as too many times of short wall mining, moving and face reversing, and the short wall surface cannot be arranged for small-area corner coal; filling equipment is required to be added in filling mining, so that the filling cost investment is increased; the roadway mining is carried out by excavating a roadway, so that the yield is low, and the ventilation management difficulty is high; continuous miner exploitation is greatly influenced by factors such as geological conditions, gas and the like, a Wangeviry exploitation mode is mostly adopted in the past, and a local fan is mostly used for ventilation. According to the regulation of ' coal mine safety regulation ' (2016 edition), a continuous mining working face must form full wind pressure ventilation and then can be mined ', so that the method for mining the corner coal by the continuous mining machine under full wind pressure is an urgent technical problem to be solved.
In many current researches, a coal mining method of a continuous miner is combined with filling, a certain application effect is achieved by utilizing quick tunneling of the continuous miner and matching with roof support of a filling process, but the method needs to increase the cost of a filling system, the filling solidification time limits the tunneling efficiency of the continuous miner, and the coal yield cannot be guaranteed.
In the past, continuous mining machines are mostly ventilated by local fans, after 2016 < coal mine safety regulation >, numerous students realize full negative pressure ventilation in a working face gateway and a stoping branch roadway, and the ventilation of a mining cave (namely a continuous mining coal working face) mainly has three modes: local fan ventilation, continuous miner dust collecting system ventilation, diffusion ventilation. Local fan ventilation, wherein during stoping, a local ventilator is used for supplying air into the stoping tunnel, and ventilation air flow returns to the stoping branch tunnel; ventilating a dust collecting system of the continuous mining machine, forcibly sucking out the dust-containing airflow of the mining tunnel by using the dust collecting system arranged in the continuous mining machine, forming a certain negative pressure area in front of the continuous mining machine, inducing the air flow of a stoping branch tunnel to enter the mining tunnel and discharging the air flow to the rear part of the continuous mining machine by using a dust removing fan, and returning the air flow of the ventilation air to the stoping branch tunnel; and (4) diffusion ventilation, namely a ventilation mode of cleaning the drift by virtue of the turbulent diffusion effect of fresh air flow, but the drift depth is not more than 6m, and the ventilation air flow also returns to the stope branch roadway. The three underground mining ventilation modes do not realize the full negative pressure ventilation of the underground mining, and do not meet the regulation of coal mine safety regulations (2016 edition) in strict meaning.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a method for mining the coal by the corner coal full-negative-pressure continuous miner, and solves the problems that full-negative-pressure ventilation cannot be realized in a mining cave and the yield is low when the method for mining the coal by the continuous miner is adopted in corner coal resources.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for mining coal by a corner coal full-negative-pressure continuous miner is characterized by comprising the following steps:
1) arranging crossheading roadways: arranging a transportation crossheading and a return air crossheading at the stable side of the underground corner coal section, wherein the transportation crossheading and the return air crossheading are communicated after being arranged at the position of a security coal pillar of the corner coal section so as to form full negative pressure ventilation of an initial crossheading roadway; the transportation crossheading is arranged into an azimuth roadway, and the return air crossheading is arranged into a plurality of sections of azimuth roadways which are connected according to the occurrence conditions of corner coal sections.
2) And (3) arranging branch roadways of the stoping units: from one side communicated with the transportation gateway and the return air gateway, mining units are sequentially arranged from inside to outside, one group of mining units consists of a mining branch roadway and a return air branch roadway, the mining branch roadway and the return air branch roadway are both connected with the transportation gateway and the return air gateway, the two branch roadways are communicated after being arranged at the position of the corner coal section safety coal pillar, branch roadway through holes are arranged in the mining units, temporary sealing walls are arranged in the branch roadway through holes, and sealing walls are respectively arranged near mining sides of the intersection positions of the transportation gateway and the return air gateway and the recovery branch roadway; arranging a damper at the crossing position of the adjacent return air gateway and the return air branch roadway; and the full negative pressure ventilation of the inner branch roadway of the mining unit is realized by utilizing the closed wall and the air damper.
3) And (3) mining by a recovery unit: and arranging a mining cave in a retreating mode from inside to outside at one side where the stoping branch roadway is communicated with the return air branch roadway for stoping until all coal pillars in the stoping unit are stoped.
4) Mining the corner coal sections: and after the first recovery unit is completed, tunneling the connected second recovery unit, then performing recovery, and so on until the recovery of the whole corner coal section is completed.
Preferably, the included angle between the stoping branch roadway, the return air branch roadway and the transportation gateway is 55-65 degrees.
Preferably, a branch road penetrating hole is arranged in the mining unit every 8-10 mining widths (namely 1 set of mining tunnels).
Preferably, the continuous mining machine and the hydraulic support are arranged at the first mining port on the innermost side in the stoping branch roadway, and the matched equipment is sequentially arranged in the stoping branch roadway.
Preferably, the mining cave width is the width of the machine body of the continuous mining machine, and the mining cave length is less than or equal to the length of the machine body of the continuous mining machine.
Preferably, the angle between the underground mining and the stoping branch roadway is 40-50 degrees.
Preferably, when the underground mining is mined, fresh air flows by the continuous mining machine and the positive mining underground mining to realize full negative pressure ventilation on the mining surface; after 1 group of underground mining is completed, opening a temporary sealing wall in the drift through hole; when the mining side top plate of the mining cave collapses and blocks the wind current, the continuous mining machine and the supporting equipment are timely retreated, and the temporary sealing wall in the drift through hole is opened to prevent the wind current short circuit.
Preferably, the coal pillar between two connected recovery units is reserved with the width of 8-12m and is used for supporting the roof.
Preferably, the transportation gateway and the return air gateway are permanent supports, the mining side walls of the back mining branch roadway and the return air branch roadway reduce the support strength, the through holes of the branch roadway only support the top plate but not support the two sides, and the top and the two sides of the mining cave are not supported.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the coal mining method provided by the invention, full negative pressure ventilation is realized in the crossheading roadway, the stoping unit branch roadway and the mining cave, the whole continuous mining working face is ventilated once, the ventilation system is more reliable and safer, the air supply of a local ventilator is completely cancelled during the mining cave stoping, the ventilation air flow is prevented from returning to the stoping branch roadway, and the roadway arrangement and the coal mining method of the whole system completely meet the relevant ventilation regulation of coal mine safety regulation (2016 edition).
(2) The coal mining method provided by the invention has the advantages that the return air crossheading is flexibly arranged, and can be arranged into the connected multi-section azimuth angle roadway according to the occurrence conditions of corner coal sections, so that the return air crossheading can effectively avoid geological structure sections; the mining unit branch roadways are flexible in arrangement length, the length can be reasonably determined according to the position of the security coal pillars of the corner coal sections, so that the coal pillars of the corner coal sections are recovered as much as possible, and the resource recovery rate is improved; meanwhile, the arrangement mode of the roadway breaks through the square, straight and straight arrangement mode of the roadway for the traditional shortwall mining and continuous mining machine mining.
(3) According to the coal mining method provided by the invention, the branch roadway through holes are innovatively arranged at the width positions of every 8-10 mining tunnels (namely 1 group of mining tunnels) in the mining unit, the temporary sealing wall is arranged in the middle of each branch roadway through hole, when the top plate on the mining side of each mining tunnel collapses to block the airflow, the continuous mining machine and the supporting equipment can be ensured to timely retreat to the safe region on the non-mining side of each branch roadway through hole, and meanwhile, the temporary sealing wall in each branch roadway through hole is opened, so that the airflow short circuit can be avoided, and the ventilation management and the safety are facilitated.
(4) The coal mining method provided by the invention can adopt one continuous mining machine and matched equipment to carry out roadway tunneling and underground mining recovery, the mining is integrated, only one continuous mining machine needs to be added, and the other matched equipment can utilize the existing equipment of the mine, so that compared with the shortwall mining and filling mining, the added personnel are less, and the investment is relatively low.
(5) According to the coal mining method provided by the invention, the proper included angles are arranged among the branch roadway, the gate way and the mining tunnel, so that the continuous mining machine and the matched equipment can run conveniently, the brushing and expanding size of the intersection point position is reduced, and the top plate management of the intersection point position of the roadway is facilitated. Meanwhile, the support strength of the mining side wall of the branch roadway is reduced, the full-through hole of the branch roadway only supports the top plate, but not supports the two sides, and the top and the two sides of the mining cave are not supported, so that the mining efficiency is improved, the coal yield is ensured, and the support cost is also reduced.
Drawings
FIG. 1 is a plan view of a coal mining method of a corner coal full-negative-pressure continuous miner according to the invention;
FIG. 2 is a schematic view of the arrangement of a stoping unit branch roadway and equipment;
FIG. 3 is a schematic view of the total negative pressure ventilation in the extraction unit during mining by the continuous miner;
in the figure: 1-transport main lane; 2, a return air main roadway; 3, transporting the crossheading; 4, returning air to the crossheading; 5-stoping branch roadways; 6-return air branch lane; 7-branch roadway through hole; 8-underground mining; 9-safety coal pillar; 10-a closed wall; 11-damper adjustment; 12-temporary containment wall; 13-a second recovery unit; 14-coal pillar; 15-continuous mining machine; 16-caterpillar hydraulic support; 17-rubber wheel shuttle vehicle; 18-a transfer crusher; 19-scraper conveyor; 20-a telescopic belt conveyor; 21-fresh air flow; 22-ventilation air flow.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in fig. 1 and fig. 2, this embodiment provides a method for mining coal by a full negative pressure continuous miner, which includes the following steps:
firstly, arranging gateway roadways, namely arranging a transportation gateway 3 and a return air gateway 4 on the stable side of an underground corner coal section, wherein the transportation gateway 3 is connected with an underground existing transportation main roadway 1, and the return air gateway 4 is connected with an underground existing return air main roadway 2; the two crossroads are communicated after being arranged at the position of the safety coal pillar of the corner coal section, so as to form the full negative pressure ventilation of the initial crossroad roadway. In this embodiment figure 1 for convenient expression, with transportation cistron 3 and return air cistron 4 parallel arrangement, in the site operation, only need with transportation cistron 3 arrange into an azimuth tunnel can to be convenient for coal transportation, and return air cistron 4 can arrange into continuous multistage azimuth tunnel according to corner coal district section existence condition, avoids the geological structure section as far as possible, satisfies the ventilation requirement can.
And secondly, arranging branch roadways of the stoping units, arranging the stoping units from the innermost side of the gateway roadway to the outside from the inside to the outside for stoping, wherein one group of stoping units comprise a stoping branch roadway 5 and a return air branch roadway 6, the stoping branch roadway 5 and the return air branch roadway 6 are connected with the transportation gateway 3 and the return air gateway 4, the two branch roadways are communicated after being arranged at the position of a safety coal pillar 9 of a corner coal section, and a branch roadway through hole 7 is arranged inside the stoping unit. During construction, a sealing wall 10 is arranged near a mining side of the intersection position of two gateway tunnels and a stoping branch tunnel, a temporary sealing wall 12 is arranged in the middle of a branch tunnel through hole 7, and two adjusting air doors 11 are arranged near the intersection position of a return air gateway and a return air branch tunnel, so that full negative pressure ventilation of the branch tunnel in the stoping unit is realized.
Thirdly, mining the mining unit, namely arranging a continuous mining machine 15 and two crawler hydraulic supports 16 at the first mining cave 8 port at the innermost side in the mining branch roadway 5, sequentially arranging a rubber wheel shuttle vehicle 17, a transfer crusher 18 and a scraper conveyor 19 in the mining branch roadway 5, and arranging a telescopic belt conveyor 20 in the transportation gateway 3. The continuous mining machine 15 is used for mining the underground coal 8, two caterpillar hydraulic supports 16 are arranged at the mouth of the underground coal 8 for supporting a top plate, the rubber wheel shuttle car 17 receives the coal quantity along with the continuous mining machine 15 and moves back and forth between the continuous mining machine 15 and the transfer crusher 18, the coal mined by the continuous mining machine 15 is transferred to the transfer crusher 18 and then transferred to the scraper conveyor 19 and the telescopic belt conveyor 20 by the transfer crusher 18, and therefore the mining of corner coal resources is completed. Adopting a back-moving type arrangement chamber 8 from inside to outside to carry out stoping, wherein the specific stoping process is as follows:
(1) firstly, arranging one crawler hydraulic support 16 at an underground mining port at the innermost side, wherein the two crawler hydraulic supports 16 are staggered by 500 mm; then, the continuous mining machine 15 is arranged at the position of the mining cave at the innermost side, and the continuous mining machine 15 is operated by remote control to cut the cutter obliquely and stope the mining cave at the innermost side.
(2) After the production of the most inner chamber is completed, the continuous production machine 15 is retreated to the connected production port, the caterpillar hydraulic support 16 is advanced to the production port, and the continuous production machine 15 is operated by remote control to cut the cutter obliquely, so as to recover the production chamber.
(3) In this way, opening the temporary sealing wall 12 in the branch roadway through hole 7 until the position of the branch roadway through hole 7 is mined, and then sequentially mining the underground cave 8 outside the branch roadway through hole 7; and so on until all the chambers 8 in the stoping unit finish the stoping.
Fourthly, mining the corner coal sections, and after the first recovery unit is completed, tunneling the connected second recovery units 13, reserving a coal pillar 14 between the two connected recovery units with the width of 8-12m for supporting a top plate, wherein the reserved size of the coal pillar 14 needs to be increased in time when the top plate has a structure or other special geological conditions and the mine pressure is seriously displayed during field construction; and then the second recovery unit 13 is recovered, and so on, until the recovery of the whole corner coal section is finished.
In the second step, the included angles between the stoping branch roadway 5 and the return air branch roadway 6 and the transportation gateway 3 are 55-65 degrees, so that the continuous miner 15 and the matched equipment can operate conveniently; and arranging branch roadway through holes 7 in the mining unit at the width positions of every 8-10 mining caves 8 (namely 1 group of mining caves), and arranging a plurality of branch roadway through holes 7 when the mining unit is longer.
In the third step, the continuous mining machine 15 sequentially recovers the coal pillars in the mining cave 8 by adopting a single-wing feed mode, and the included angle between the mining cave 8 and the mining branch roadway 5 is 40-50 degrees so as to facilitate the operation of the continuous mining machine 15. The width of the mining unit 8 is the width of the machine body of the continuous mining machine 15, the length of the mining unit 8 is not greater than the length of the machine body of the continuous mining machine 15, namely the length of the width of the coal pillar in the mining unit in the direction of the mining unit 8 is not greater than the length of the machine body of the continuous mining machine 15.
In the embodiment, the model of the continuous mining machine 15 is EML340, the whole size is 11m multiplied by 3.3m multiplied by 2.05m (length multiplied by width multiplied by height), when in site construction, the width of the mining cave 8 is 3.3m, the maximum length of the mining cave 8 is 11m (considered according to 11 m), the included angle between the mining cave 8 and the mining branch roadway 5 is 40-50 degrees (considered according to 45 degrees), and the width of the coal pillar in the mining unit is 7.78 m; and arranging one branch roadway through hole 7 at every 8-10 (considered according to 9) mining cave 8 width positions to obtain 1 group of mining caves with the width of 29.7m, namely the coal pillar length of the branch roadway through hole 7 is 29.7 m.
As shown in fig. 3, in the third step, when the underground mining 8 is mined, the fresh air flow 21 flows by the continuous mining machine 15 and the positive mining underground mining 8 to realize the full negative pressure ventilation on the mining surface; when the mining side roof of the mining cave 8 collapses and blocks the wind current, the continuous mining machine 15 and the supporting equipment are timely retreated to the safe area on the non-mining side of the branch roadway through hole 7, the temporary sealing wall 12 in the branch roadway through hole 7 is opened to prevent the wind current short circuit, and after the mining side roof collapses stably, the next group of mining caves is mined again.
The transportation gateway 3 and the return air gateway 4 are required to be permanently supported, the mining side walls of the back mining branch roadway 5 and the return air branch roadway 6 are required to reduce the supporting strength, the branch roadway through holes 7 only support the top plate, but not support the two sides, and the top and the two sides of the mining cave 8 are not supported. The method improves the mining efficiency, ensures the coal yield and reduces certain supporting cost.
The continuous miner mining method is suitable for the following conditions: (1) the thickness of the coal seam is 2m-5m, the operation of equipment is not facilitated when the thickness of the coal seam is too low, and the continuous mining machine 15 needs to cut a top plate and a bottom plate, so that the overall working efficiency of a working surface is reduced; when the coal wall is too high, the continuous miner 15 cannot cut the coal wall at one time. (2) The dip angle of the coal seam is less than 8 degrees, the equipment is difficult to operate when the dip angle is too large, and the working efficiency is lower. (3) In a low-gas mine, when the gas emission amount is high, ventilation management is difficult during the heading and stoping of the continuous mining machine 15.
In the embodiment, the average thickness of the coal seam of the corner coal section is 4.5m, the average inclination angle of the coal seam is 4 degrees, the maximum inclination angle is 7 degrees, and the coal seam is a low-gas mine; and a continuous mining machine 15 and matched equipment are adopted for roadway tunneling and mining and back mining, the mining is integrated, the model of the continuous mining machine 15 is EML340, and the mining height range is 2.7-5.5 m. The sizes of the sections of the transportation crossheading 3 and the return air crossheading 4 are 4.5m multiplied by 3.0m during construction, and the top and the two sides are supported by a deformed steel anchor rod, an anchor rope and a metal net; the sizes of the sections of the extraction branch lane 5 and the return air branch lane 6 are both 5.0m multiplied by 4.5m, the top and the non-extraction side wall are supported by a deformed steel bar anchor rod, an anchor rope and a metal net, and the extraction side wall is supported by a glass steel anchor rod and a plastic net; the cross section size of the branch roadway through hole 7 is 3.3m multiplied by 4.5m, the width is the width of the continuous mining machine 15 for cutting once coal, the top is supported by a deformed steel bar anchor rod, an anchor rope and a metal net, and two sides are not supported; the size of the section of the underground mining is 3.3m multiplied by 4.5m, and the top and the two sides are not supported. Finally, the monthly coal mining amount reaches 4 ten thousand tons, the coal yield is ensured, better economic benefit and social benefit are obtained, and the feasibility of the technical scheme of the invention is proved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A method for mining coal by a corner coal full-negative-pressure continuous miner is characterized by comprising the following steps:
1) arranging crossheading roadways: a transportation crossheading (3) and a return air crossheading (4) are arranged on the stable side of the underground corner coal section, and the transportation crossheading (3) and the return air crossheading (4) are communicated after being arranged at the position of a safety coal pillar (9) of the corner coal section so as to form full negative pressure ventilation of an initial crossheading roadway; the transportation crossheading (3) is arranged into an azimuth roadway, and the return air crossheading (4) is arranged into a plurality of sections of connected azimuth roadways according to the occurrence conditions of corner coal sections;
2) and (3) arranging branch roadways of the stoping units: from one side communicated with the transportation gateway (3) and the return air gateway (4), stoping units are sequentially arranged from inside to outside, one group of stoping units consists of a stoping branch roadway (5) and a return air branch roadway (6), the stoping branch roadway (5) and the return air branch roadway (6) are both connected with the transportation gateway (3) and the return air gateway (4), the two branch roadways are communicated after being arranged at the position of a safety coal pillar (9) of a corner coal section, a branch roadway through hole (7) is arranged in the stoping unit, a temporary sealing wall (12) is arranged in the branch roadway through hole (7), and sealing walls (10) are respectively arranged near the mining sides at the positions where the transportation gateway (3) and the return air gateway (4) are respectively crossed with the stoping branch roadway (5); a regulating damper (11) is arranged at the position adjacent to the crossing position of the return air gateway (4) and the return air branch roadway (6); the full negative pressure ventilation of the branch roadway in the extraction unit is realized by utilizing a sealing wall and an air damper (11);
3) and (3) mining by a recovery unit: arranging a mining cave (8) in a retreating mode from inside to outside on one side, communicated with the return air branch roadway (6), of the mining branch roadway (5) for mining until all coal pillars in the mining unit are mined; when the underground mining is carried out, fresh air flows by the continuous mining machine and the positive stoping underground mining to realize full negative pressure ventilation on the stoping surface; after 1 group of underground mining is finished, opening a temporary sealing wall (12) in the branch roadway through hole (7); when the mining side top plate of the mining cave (8) collapses and blocks the airflow, the continuous mining machine and the supporting equipment are timely retreated, and the temporary sealing wall (12) in the branch roadway through hole (7) is opened to prevent the airflow short circuit;
4) mining the corner coal sections: and after the first recovery unit is completed, tunneling the connected second recovery unit, then performing recovery, and so on until the recovery of the whole corner coal section is completed.
2. The method for mining the coal by the corner coal full-negative-pressure continuous miner according to claim 1, wherein the included angle between the stoping branch roadway (5) and the return air branch roadway (6) and the transportation gate way (3) is 55-65 degrees.
3. The method for mining coal by using the corner coal full-negative-pressure continuous miner according to claim 1, wherein a branch roadway through hole (7) is arranged in the mining unit every 1 group of mining tunnel width, and the 1 group is 8-10 mining tunnels.
4. The method for mining coal by using the corner coal full-negative-pressure continuous miner according to claim 1, characterized in that in the step 3, the continuous miner (15) and the hydraulic support (16) are arranged at the first mining port at the innermost side in the mining branch roadway (5), and supporting equipment is arranged in the mining branch roadway (5) in sequence.
5. The method for mining the coal of the corner coal full-negative-pressure continuous miner according to claim 4, wherein the width of the miner (8) is the width of the machine body of the continuous miner (15), and the length of the miner (8) is less than or equal to the length of the machine body of the continuous miner (15).
6. The method for mining the coal by the corner coal full-negative-pressure continuous miner according to claim 1, wherein the angle between the mining tunnel (8) and the stoping branch roadway (5) is 40-50 degrees.
7. The method for mining the coal of the corner coal full-negative-pressure continuous miner according to claim 1, wherein the coal pillar between two connected mining units is reserved with the width of 8-12m and used for supporting the top plate.
8. The method for mining the coal of the corner coal full-negative-pressure continuous miner according to claim 1, wherein the transportation crossheading (3) and the return air crossheading (4) are permanently supported, the roadway support holes (7) only support the top but not support the two sides, and the top and the two sides of the mining cave (8) are not supported.
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| CN104775817B (en) * | 2015-03-05 | 2016-12-28 | 路彬 | Full negative pressure Lian Cailian fills step-by-step replacement railways and water-bodies method |
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