CN104088643A - High-dipping extremely-close-distance coal seam top coal caving mining method - Google Patents
High-dipping extremely-close-distance coal seam top coal caving mining method Download PDFInfo
- Publication number
- CN104088643A CN104088643A CN201410307670.8A CN201410307670A CN104088643A CN 104088643 A CN104088643 A CN 104088643A CN 201410307670 A CN201410307670 A CN 201410307670A CN 104088643 A CN104088643 A CN 104088643A
- Authority
- CN
- China
- Prior art keywords
- coal
- coal seam
- manually
- gateway
- seam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a high-dipping extremely-close-distance coal seam top coal caving mining method. According to the method, a transportation gateway is constructed along one side of a coal layer bottom plate and an air returning gateway is constructed on the other coal layer; the elevation of a bottom plate of the air returning gateway is 4-4.5m higher than that of a bottom plate of the transportation gateway; rectangular roadways are constructed between the two gateways at an interval of 10m and are used as connection roadways; hydraulic brackets are distributed on two coal layers along the thickness directions of the coal layers; each circulating unit advance of a worktable bracket is the same as the distance of the connection roadways; in a top coal caving process, top coal discharged by the coal layers of the transportation gateway and manually-mined falling coal in a manner of manually shoveling coal and filling into a scraper plate conveyor to be transported out; the top coal discharged by the coal layers of the air returning gateway is filled into enamel chutes of the connection roadways in a manner of manually shoveling the coal to flow into a bracket tail beam of the coal layers of the transportation gateway, and is put into the scraper plate conveyor to be transported out by manually shoveling the coal. The high-dipping extremely-close-distance coal seam top coal caving mining method has the advantages of being simple in arrangement of a working surface, strong in adaptability, good in ventilation, relatively good in safety degree, large in supporting space and high in production efficiency.
Description
Technical field
The invention belongs to Mineral Engineering field, relate in particular to a kind of high-dipping point blank coal seam Sub-Level Caving coal-mining method.
Background technology
Steeply-inclined seam mining method is the difficult problem in mining technique always, has caused the attention of national departments concerned.For a long time, people have made unremitting effort to this, and have obtained gratifying progress.But due to the particularity of steeply-inclined seam mining condition, exploitation method remains this class mine improves the major obstacle of Technological Economy looks.Half-edge coal seam reserves account for 40% of coal in China gross reserves, and the tax of the mining area of southern area 80% has half-edge coal seam.China is southern mining area particularly, and the thickness major part of half-edge coal seam is below 10m, in the majority with medium-thickness seam, and occurrence condition complexity.The exploitation method in these coal seams is of a great variety, but most of also immature, has many problems.Therefore, about the research of steeply-inclined seam mining method, the development of China coal industry is still had to very important function.
Summary of the invention
The object of the present invention is to provide a kind of high-dipping point blank coal seam Sub-Level Caving coal-mining method, the method has improved the production capacity of work plane, reduce the drivage ratio in tunnel, be applicable to the little coal seam unitized production of interlamellar spacing, first advance excavates connection roadway and forms U-shaped ventilation, methane accumulation while avoiding Sub-Level Caving, improves environment on coalface.
The present invention is achieved in that a kind of high-dipping point blank coal seam Sub-Level Caving coal-mining method, comprises the following steps:
(1), along a seat earth side construction haulage gate, at another coal seam construction air return way, wherein the air return way base plate in coal seam is than the high 4～4.5m of haulage gate floor level in seat earth side; Two crossheadings are the connection roadway of linking up two crossheadings at interval of 10m construction rectangular shaped roadways, and connection roadway is inclined gallery, and its elevation angle 30 is spent;
(2) arrange hydraulic support in two coal seams along coal seam thickness, the each circulation unit advance of force piece is the same with the spacing of connection roadway, makes to move after frame at every turn, and contact inclined gallery are all between the tail boom and rear column of force piece;
(3) advance of the face is taked human-generated explosives mode to open side to advance, and after side, takes manually to hovel from one place to another coal and pack the mode that scratch board conveyor transports into opening;
(4) when Sub-Level Caving, being provided with the top coal that the coal seam of haulage gate emits and the coal breakage of manually opening side takes manually to hovel from one place to another coal and packs the mode that scratch board conveyor transports into, be provided with the top coal that the coal seam of air return way emits and pack by manually hoveling the mode of coal from one place to another the support tail boom place that flows into the coal seam that is provided with haulage gate in the enameled trough of getting in touch with inclined gallery into, more manually hovel coal from one place to another and pack in scratch board conveyor and transport;
(5) for the design of ventilation circuit, the connection roadway of first advance is sealed by brattice, fresh wind enters coal seam haulage gate to work plane coal seam section through ginney to section crossdrift, then through contact inclined gallery to air return way coal seam section; The weary wind of work plane to section windstone gate, then imports mine return air system through ventilation holes to windstone gate through air return way; In the time of Sub-Level Caving, being provided with top coal that the coal seam of air return way emits packs into and in the enameled trough of getting in touch with inclined gallery, flows into while being provided with the coal seam of haulage gate by manually hoveling the mode of coal from one place to another, in connection roadway, ventilate and be obstructed, the connection roadway of opening first advance forms U-shaped and ventilates, and ventilation circuit is identical with former circuit.
The present invention overcomes the deficiencies in the prior art, and a kind of high-dipping point blank coal seam Sub-Level Caving coal-mining method is provided, and the feature of the method shows:
(1) half-edge coal seam feature
The present invention adopts contiguous seams unitized production, make full use of that half-edge coal seam inclination angle is large, coal seam is easily caving, steady of roof feature relatively preferably, utilize the advantage of mining, form comparatively complete ore deposit pressure-controlled and process for stoping, really realized the high-yield and high-efficiency of steeply-inclined seam mining.
(2) high-dipping medium-thickness seam is combined the technology of adopting
Adopt and adapt to pitchwork technique, solve equipment anti-skid, fly cash and hurt sb.'s feelings, personnel's difficulty in walking and termination be emergency exit problem reliably, realizes safe and efficient production.Application Roadway Sub-Level Caving is mined, and adopts special caving roof coal hydraulic support, takes low caving coal, has improved coal mining rate, increases output.
(3) U-shaped draft type
Two coal seam unitized productions, excavate connection roadway between coal seam, fresh distinguished and admirable through haulage gate, connection roadway, and air return way, forms U-shaped and ventilates.In the time moving frame Sub-Level Caving, get in touch with inclined gallery and born and slip coal, be obstructed through getting in touch with capable ventilation, now open the brattice in the connection roadway that first advance excavates, formed again U-shaped ventilation.Not only ensure the ventilation of work plane, the methane accumulation having caused while having avoided again Sub-Level Caving, the safety that has improved work plane.
Brief description of the drawings
Fig. 1 is that the work plane master who implements coal-mining method of the present invention looks schematic diagram; Wherein: 1, A coal seam; 2, B coal seam; 3, rock stratum;
Fig. 2 is the work plane schematic top plan view of implementing coal-mining method of the present invention; Wherein, 4, haulage gate; 5, air return way; 6, connection roadway; 7, first advance connection roadway; 8, hydraulic support; 9, drag conveyor; 10, rubber conveyer; 11, brattice; 12, coal side; 13, top coal.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, in Fig. 1, A coal seam 1 and B coal seam 2 are in-plant two medium-thickness seams of high-dipping, and rock stratum 3 is between two coal seams.Referring to accompanying drawing 2, in method implementation process, along A coal seam 1 base plate side construction haulage gate 4, adopt rectangular shaped roadways; B coal seam 2 air return way 5 of constructing, adopts quadrangle tunnel.Wherein air return way 5 floor levels in A coal seam 1 are than the high 4～4.5m of the haulage gate of B coal seam 2 base plate sides 4 floor level, two crossheadings are the connection roadway 6 of linking up two crossheadings at interval of the construct rectangular shaped roadways of wide 1.6m, high 2.0m of 10m, connection roadway is inclined gallery, 30 °, its elevation angle arranges brattice 11 in connection roadway.At A, hydraulic support 8 is arranged in B coal seam, and between the support in 1 haulage gate of A coal seam, across pitch direction is laid scratch board conveyor 9, and at haulage gate correct position, rubber conveyer 10 is installed, 8, scratch board conveyor machine is overlapped on rubber conveyer machine 10 tails, forms work plane raw coal transportation system.The each circulation unit advance of force piece is the same with the spacing of contact inclined gallery, makes to move after frame at every turn, and contact inclined gallery are all between the tail boom and rear column of force piece.The advance of the face is taked human-generated explosives mode to open coal side 12 to advance, and takes articulated roof beam and hydraulic prop mode to carry out temporary lining opening after side.Move (spacing of contact inclined gallery) after frame distance and take spud pile to fix when reaching a circulation, before support, slip and pass cylinder and be connected by frame and alternately move frame with spud pile.When Sub-Level Caving, the top coal that A coal seam 1 emits and the coal breakage of manually opening side are taked manually to hovel from one place to another coal and are packed the mode that scratch board conveyor transports into, the top coal that B coal seam 2 emits packs by manually hoveling the mode of coal from one place to another the support tail boom place that flows into A coal seam 1 in the enameled trough of getting in touch with inclined gallery into, packs in scratch board conveyor 9 and transports manually hoveling coal from one place to another.
Referring to Fig. 2, for the design of ventilation circuit, fresh wind enters A coal seam 1 haulage gate 4 to work plane A coal seam section through ginney to section crossdrift, then through getting in touch with oblique 6 lanes to B coal seam section; The weary wind of work plane to section windstone gate, then imports mine return air system through ventilation holes windstone gate through the air return way 5 in B coal seam.The top coal that B coal seam 2 emits in the time of Sub-Level Caving packs into while flowing into B coal seam in the enameled trough of getting in touch with inclined gallery 5 by manually hoveling the mode of coal from one place to another, the interior ventilation of connection roadway 6 is obstructed, the brattice 11 of opening the connection roadway 7 interior settings of first advance forms U-shaped and ventilates, and ventilation circuit is identical with former circuit.
Than the shortcoming and defect of prior art, the present invention has following beneficial effect:
(1) contiguous seams unitized production, work plane output is large, and when after being skilled in technique of workman, work plane is each to be cycled to used in the time that crossheading expands side and greatly to shorten, and after day cycle-index improves, the production capacity of work plane can further improve.
(2) ten thousand tons of drivage ratios are lower, and work plane only has two crossheadings and a part of connection roadway just to exploit two coal seams simultaneously, with other coal-mining method comparison, tunnels at least less a gate road.
(3) work plane is arranged simply, and strong adaptability is applicable to high-dipping mining of closed distance coal seam group, and more than coal seam thickness 2.5m, interlamellar spacing is less than two coal seam unitized productions of 10m.
(4) Sub-Level Caving adopts special caving roof coal hydraulic support, takes low caving coal, and workman's groundwork is operation support Sub-Level Caving and moves frame, and manually hovel coal from one place to another, per tour only needs 4～5 people, when coal seam is thicker, while needing to expand side propelling, per tour increases by 2～3 people.Work plane coal seam part adopts hydraulic support stand, and connection roadway part is rock gangway, and work plane safe coefficient is better, and support space is large.
(5) connection roadway that first advance excavates forms U-shaped and ventilates in the time of Sub-Level Caving, avoids the gathering of face gas, has improved the safety of work plane, has improved workman's operating environment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. a high-dipping point blank coal seam Sub-Level Caving coal-mining method, is characterized in that comprising the following steps:
(1), along a seat earth side construction haulage gate, at another coal seam construction air return way, wherein the air return way base plate in coal seam is than the high 4～4.5m of haulage gate floor level in seat earth side; Two crossheadings are the connection roadway of linking up two crossheadings at interval of 10m construction rectangular shaped roadways, and connection roadway is inclined gallery, and its elevation angle 30 is spent;
(2) arrange hydraulic support in two coal seams along coal seam thickness, the each circulation unit advance of force piece is the same with the spacing of connection roadway, makes to move after frame at every turn, and contact inclined gallery are all between the tail boom and rear column of force piece;
(3) advance of the face is taked human-generated explosives mode to open side to advance, and after side, takes manually to hovel from one place to another coal and pack the mode that scratch board conveyor transports into opening;
(4) when Sub-Level Caving, being provided with the top coal that the coal seam of haulage gate emits and the coal breakage of manually opening side takes manually to hovel from one place to another coal and packs the mode that scratch board conveyor transports into, be provided with the top coal that the coal seam of air return way emits and pack by manually hoveling the mode of coal from one place to another the support tail boom place that flows into the coal seam that is provided with haulage gate in the enameled trough of getting in touch with inclined gallery into, more manually hovel coal from one place to another and pack in scratch board conveyor and transport;
(5) for the design of ventilation circuit, the connection roadway of first advance is sealed by brattice, fresh wind enters coal seam haulage gate to work plane coal seam section through ginney to section crossdrift, then through contact inclined gallery to air return way coal seam section; The weary wind of work plane to section windstone gate, then imports mine return air system through ventilation holes to windstone gate through air return way; In the time of Sub-Level Caving, being provided with top coal that the coal seam of air return way emits packs into and in the enameled trough of getting in touch with inclined gallery, flows into while being provided with the coal seam of haulage gate by manually hoveling the mode of coal from one place to another, in connection roadway, ventilate and be obstructed, the connection roadway of opening first advance forms U-shaped and ventilates, and ventilation circuit is identical with former circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410307670.8A CN104088643B (en) | 2014-06-30 | 2014-06-30 | A kind of high-dipping point blank coal seam Sub-Level Caving coal-mining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410307670.8A CN104088643B (en) | 2014-06-30 | 2014-06-30 | A kind of high-dipping point blank coal seam Sub-Level Caving coal-mining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104088643A true CN104088643A (en) | 2014-10-08 |
| CN104088643B CN104088643B (en) | 2016-05-11 |
Family
ID=51636388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410307670.8A Expired - Fee Related CN104088643B (en) | 2014-06-30 | 2014-06-30 | A kind of high-dipping point blank coal seam Sub-Level Caving coal-mining method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104088643B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632224A (en) * | 2014-12-30 | 2015-05-20 | 辽宁天安科技有限公司 | Shortwall hydraulic mining method along strike |
| CN104832179A (en) * | 2015-05-19 | 2015-08-12 | 天地科技股份有限公司 | Steep thick coal seam horizontal section full negative pressure ventilation and top coal caving coal mining method |
| CN105067220A (en) * | 2015-09-11 | 2015-11-18 | 中国矿业大学 | Mine ventilation network system experimental device and method |
| CN105986821A (en) * | 2016-01-05 | 2016-10-05 | 淮南市矿用电子技术研究所 | Mining method for steeply inclined coal seam |
| CN108661640A (en) * | 2018-03-12 | 2018-10-16 | 张庆振 | Half-edge coal seam longwall top coal caving technique based on the U-shaped horizontal ventilation in artificial tunnel |
| CN109139013A (en) * | 2018-08-24 | 2019-01-04 | 大同煤矿集团有限责任公司 | Ultra close distance coal seam exploits country rock roadway layout method |
| WO2019140812A1 (en) * | 2018-01-18 | 2019-07-25 | 山东科技大学 | Mining method for single steeply-inclined thick coal seam |
| CN110578523A (en) * | 2019-10-16 | 2019-12-17 | 高九华 | Method and system for mining top coal of medium-thickness coal seam with extra-large dip angle |
| CN111101942A (en) * | 2018-10-29 | 2020-05-05 | 西安科技大学 | Method and system for recovering residual coal on lower wall in caving coal mining of inclined extra-thick coal seam |
| CN111561317A (en) * | 2019-10-28 | 2020-08-21 | 靳银祥 | Scraping coal mining method for steeply inclined coal seam |
| CN112983422A (en) * | 2021-03-17 | 2021-06-18 | 西安科技大学 | Ore drawing mining method for inclined layered solid deposit |
| CN113153301A (en) * | 2021-06-01 | 2021-07-23 | 闫少宏 | Horizontal sectional mechanized top coal caving mining method for steep coal seam |
| CN113803070A (en) * | 2021-10-27 | 2021-12-17 | 西安科技大学 | Horizontal subsection coordinated mining method for steeply inclined short-distance ultra-thick coal group |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1607316A (en) * | 2003-10-16 | 2005-04-20 | 新疆乌鲁木齐矿业（集团）有限责任公司 | Top-coal caving method with horizontal sectional light-support in steep and close seams |
| RU2276267C1 (en) * | 2005-03-10 | 2006-05-10 | Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет)" | Development method for thick steep coal seams liable to spontaneous ignition |
| RU2381364C1 (en) * | 2008-12-11 | 2010-02-10 | Государственное образовательное учреждение высшего профессионального образования "Сибирский государственный индустриальный университет" | Method for development of steep layers by sublevel hydraulic breakage with associated outlet of shrunk coal from chambers of upper story |
| CN103061765A (en) * | 2012-12-14 | 2013-04-24 | 北京昊华能源股份有限公司 | Z type horizontal stratification top coal caving coal mining method in half-edge thick coal seam |
-
2014
- 2014-06-30 CN CN201410307670.8A patent/CN104088643B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1607316A (en) * | 2003-10-16 | 2005-04-20 | 新疆乌鲁木齐矿业（集团）有限责任公司 | Top-coal caving method with horizontal sectional light-support in steep and close seams |
| RU2276267C1 (en) * | 2005-03-10 | 2006-05-10 | Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (технический университет)" | Development method for thick steep coal seams liable to spontaneous ignition |
| RU2381364C1 (en) * | 2008-12-11 | 2010-02-10 | Государственное образовательное учреждение высшего профессионального образования "Сибирский государственный индустриальный университет" | Method for development of steep layers by sublevel hydraulic breakage with associated outlet of shrunk coal from chambers of upper story |
| CN103061765A (en) * | 2012-12-14 | 2013-04-24 | 北京昊华能源股份有限公司 | Z type horizontal stratification top coal caving coal mining method in half-edge thick coal seam |
Non-Patent Citations (1)
| Title |
|---|
| 尚向东等: "急倾斜近距离厚煤层联合开采新工艺", 《煤炭技术》 * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632224A (en) * | 2014-12-30 | 2015-05-20 | 辽宁天安科技有限公司 | Shortwall hydraulic mining method along strike |
| CN104832179A (en) * | 2015-05-19 | 2015-08-12 | 天地科技股份有限公司 | Steep thick coal seam horizontal section full negative pressure ventilation and top coal caving coal mining method |
| CN105067220A (en) * | 2015-09-11 | 2015-11-18 | 中国矿业大学 | Mine ventilation network system experimental device and method |
| CN105986821A (en) * | 2016-01-05 | 2016-10-05 | 淮南市矿用电子技术研究所 | Mining method for steeply inclined coal seam |
| WO2019140812A1 (en) * | 2018-01-18 | 2019-07-25 | 山东科技大学 | Mining method for single steeply-inclined thick coal seam |
| CN108661640A (en) * | 2018-03-12 | 2018-10-16 | 张庆振 | Half-edge coal seam longwall top coal caving technique based on the U-shaped horizontal ventilation in artificial tunnel |
| CN108661640B (en) * | 2018-03-12 | 2019-05-24 | 张庆振 | Half-edge coal seam longwall top coal caving technique based on artificial tunnel U-shaped horizontal ventilation |
| CN109139013A (en) * | 2018-08-24 | 2019-01-04 | 大同煤矿集团有限责任公司 | Ultra close distance coal seam exploits country rock roadway layout method |
| CN111101942A (en) * | 2018-10-29 | 2020-05-05 | 西安科技大学 | Method and system for recovering residual coal on lower wall in caving coal mining of inclined extra-thick coal seam |
| CN110578523A (en) * | 2019-10-16 | 2019-12-17 | 高九华 | Method and system for mining top coal of medium-thickness coal seam with extra-large dip angle |
| CN111561317A (en) * | 2019-10-28 | 2020-08-21 | 靳银祥 | Scraping coal mining method for steeply inclined coal seam |
| CN111561317B (en) * | 2019-10-28 | 2022-02-25 | 靳银祥 | Scraping coal mining method for steeply inclined coal seam |
| CN112983422A (en) * | 2021-03-17 | 2021-06-18 | 西安科技大学 | Ore drawing mining method for inclined layered solid deposit |
| CN113153301A (en) * | 2021-06-01 | 2021-07-23 | 闫少宏 | Horizontal sectional mechanized top coal caving mining method for steep coal seam |
| CN113803070A (en) * | 2021-10-27 | 2021-12-17 | 西安科技大学 | Horizontal subsection coordinated mining method for steeply inclined short-distance ultra-thick coal group |
| CN113803070B (en) * | 2021-10-27 | 2024-02-27 | 西安科技大学 | Horizontal sectional coordination mining method for steep short-distance super-thick coal group |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104088643B (en) | 2016-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104088643B (en) | A kind of high-dipping point blank coal seam Sub-Level Caving coal-mining method | |
| CN103628877B (en) | A kind of multilayer gentle dip is thin-in thick mineral deposit filling mining method | |
| CN103016053B (en) | Method of local filling to control surface subsidence in gob | |
| CN103742148B (en) | The soft coal-mining method covering the descending waste filling of supporting of a kind of half-edge coal seam | |
| CN108150172A (en) | A kind of single method of mining coal from heavy pitch thick coal seam | |
| CN103821515B (en) | A kind of double face filling coal mining technique | |
| CN104100270B (en) | A kind of low-angle dip mineral ore Truckless mining method | |
| CN105298496B (en) | Complete adopt of reserved working face coal column is set to fill coal-mining method entirely | |
| CN103775085B (en) | High-dipping medium-thickness seam flexible type shield digging one supporting is without pillar working | |
| CN103953345B (en) | A kind of small section entry retaining along gob side exploitation method | |
| CN109236363A (en) | A kind of shortwall block formula filling coal mining method | |
| CN108825237B (en) | A kind of special thick coal continuous milling machine divides excavating technology with the layering combined is filled | |
| CN103104260B (en) | Under complex geological condition, comprehensive-machine is to hand-pulled noodles coal-mining method | |
| CN105351004A (en) | Bagged gangue concrete united roadside supporting method | |
| CN112922596A (en) | Dendritic backward type underground mining method for thin coal seam at end slope of strip mine | |
| CN207829887U (en) | A kind of single steep-inclined thick coal seam coal mining system | |
| CN102031972A (en) | L-shaped mining method under open-underground mining | |
| CN105134212A (en) | Method for ensuring fully-mechanized top coal caving recovery rate of three-soft thick coal seam roadway tunneling along top | |
| CN105201508A (en) | Backstoping method for continuous miner under hard roof condition of thick coal seam | |
| CN104343453A (en) | Filling mining method of slowly-inclined medium-thick ore deposit | |
| CN101858216B (en) | Method for recovering stagnant coal pillars left by breast type coal mining method | |
| CN108894783B (en) | A kind of half-edge coal seam paste body filling coal-mining technique | |
| CN104088642B (en) | A kind of super Shortwall mining method | |
| CN113944464B (en) | Coal mining method of corner coal full-negative-pressure continuous miner | |
| CN105986821A (en) | Mining method for steeply inclined coal seam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20170630 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |