CN112127887A - Coal mining method - Google Patents
Coal mining method Download PDFInfo
- Publication number
- CN112127887A CN112127887A CN202011007525.XA CN202011007525A CN112127887A CN 112127887 A CN112127887 A CN 112127887A CN 202011007525 A CN202011007525 A CN 202011007525A CN 112127887 A CN112127887 A CN 112127887A
- Authority
- CN
- China
- Prior art keywords
- hydraulic support
- coal
- layer
- wood
- numbered
- 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
- 239000003245 coal Substances 0.000 title claims abstract description 138
- 238000005065 mining Methods 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000002023 wood Substances 0.000 claims abstract description 91
- 229910000831 Steel Inorganic materials 0.000 claims description 65
- 239000010959 steel Substances 0.000 claims description 65
- 239000002184 metal Substances 0.000 claims description 36
- 238000010276 construction Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000005641 tunneling Effects 0.000 claims description 5
- 239000011435 rock Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005422 blasting Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D19/00—Provisional protective covers for working space
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/06—Filling-up mechanically
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a coal mining method, which comprises the following steps: step S1: dividing a thick coal seam into a top part layer, a plurality of middle layers and a bottom part layer in advance; step S2: detecting a coal seam thinning area in the bottom part of the layer in advance, wherein a middle layer above the bottom part of the layer is called a first middle layer, and a middle layer above the first middle layer is called a second middle layer; step S3: and adopting a fully mechanized mining working face to carry out stoping on the top part layer, the middle layer and the bottom layer in sequence. According to the coal mining method disclosed by the invention, the wood buttress is erected in advance in the first middle layer above the bottom layer, and the coal seam thinning area of the bottom layer is filled, so that the height of the mining space of the fully mechanized coal mining face is artificially increased, the rock of the bottom plate of the fully mechanized coal mining face can be prevented from being broken, the fully mechanized coal mining face can smoothly pass through the coal seam thinning area, and the coal in the coal seam thinning area is efficiently mined.
Description
Technical Field
The invention relates to the technical field of coal seam mining, in particular to a coal mining method.
Background
As is well known, the mining difficulty of the coal seam thinning area is higher, the mining efficiency is lower, and the mining of the thin coal seam in the thinning area is always a technical problem troubling the coal mine production. The reserves of the coal seam thinning area also account for a part of mine resources, but if the mining is abandoned, the coal resources are wasted. At present, the local coal seam thinning area is crossed to the working face and blasting loose rock is adopted to cut by force, and the working face production process is additionally provided with the working procedures of drilling, charging, protecting equipment, blasting and the like, so that the production procedures are more complicated, and the safety management and control are more difficult.
In view of the above, it is necessary to provide a method for efficiently mining a coal seam thinning area.
Disclosure of Invention
The invention aims to provide a coal mining method which can carry out efficient stoping on a coal seam thinning area.
The technical scheme of the invention provides a coal mining method, which comprises the following steps:
step S1: dividing a thick coal seam into a top part layer, a plurality of middle layers and a bottom part layer in advance;
step S2: detecting a coal seam thinning area in the bottom part of the layer in advance, wherein a middle layer above the bottom part of the layer is called a first middle layer, and a middle layer above the first middle layer is called a second middle layer;
step S3: adopting a fully mechanized mining face to sequentially carry out mining on the top part layer, the middle layer and the bottom part layer;
wherein, step S31: when the fully mechanized mining face is mined and tunneled in the second middle layer, I-shaped steel is laid on the bottom plate of the second middle layer;
step S32: when the fully mechanized coal mining face is mined and tunneled in the first middle layer, a metal net and a steel wire rope are laid below a top plate of the first middle layer, a plurality of rows of wood piles are sequentially erected on a bottom plate of the first middle layer corresponding to the coal seam thinning area, and the wood piles are supported between the bottom plate and the top plate of the first middle layer;
step S33: when the fully mechanized mining face is in the bottom partial layer mining and tunneling, the wood buttress is removed when the fully mechanized mining face passes through the coal seam thinning area, the fully mechanized mining face can smoothly pass through the coal seam thinning area, and the coal in the coal seam thinning area is mined.
In one optional technical scheme, the method further comprises the following steps:
and when the fully mechanized mining face carries out mining and tunneling in the middle layering on the layer above the second middle layering, a metal net and a steel wire rope are laid on the bottom plate of the middle layering.
In one optional technical solution, step S31 further includes the following steps:
dividing a hydraulic support of a fully mechanized mining face into an odd hydraulic support and an even hydraulic support in sequence;
firstly, pulling a first even-numbered hydraulic support forwards and laying I-steel behind the first even-numbered hydraulic support, then pulling a second even-numbered hydraulic support and laying I-steel behind the second even-numbered hydraulic support, and sequentially executing the steps until I-steel is also laid behind the last even-numbered hydraulic support, wherein the odd-numbered hydraulic support lags behind the even-numbered hydraulic support Xm;
and arranging at least one I-steel at the rear part of each odd-numbered hydraulic support, wherein one end of the I-steel is positioned on the four connecting rods of the odd-numbered hydraulic support, the other end of the I-steel is inserted below the metal mesh false roof of the goaf, the odd-numbered hydraulic supports are pulled forwards in sequence, and the I-steel is laid behind the odd-numbered hydraulic supports.
In one optional technical solution, step S32 further includes the following steps:
the area, positioned above the coal seam thinning area, in the first middle layer is called a construction wood buttress area;
and before the fully mechanized mining face enters the construction wood buttress area in the first middle layer, the tail beam of the hydraulic support is detached in advance.
In one optional technical solution, step S32 further includes the following steps:
dividing a hydraulic support of a fully mechanized mining face into an odd hydraulic support and an even hydraulic support in sequence;
when a first row of wood stacks is erected:
step S321: pulling a first even-numbered hydraulic support forwards and erecting a wood pile behind the first even-numbered hydraulic support, then pulling a second even-numbered hydraulic support and erecting a wood pile behind the second even-numbered hydraulic support, and sequentially executing the steps until the wood pile is erected behind the last even-numbered hydraulic support;
step S322: after wood stacks are arranged behind the even-numbered hydraulic supports, the first odd-numbered hydraulic support is pulled forwards and the wood stacks are arranged behind the first odd-numbered hydraulic support, then the second odd-numbered hydraulic support is pulled and the wood stacks are arranged behind the second odd-numbered hydraulic support, and the steps are sequentially executed until the wood stacks are arranged behind the last odd-numbered hydraulic support;
when a second row of wood stacks is erected:
step S321 and step S322 are repeatedly performed.
In one of the alternative technical solutions, when erecting the wood crib after the second row of wood cribs:
step S323: simultaneously pulling all the even-numbered hydraulic supports forwards, and erecting a wood pile behind each even-numbered hydraulic support;
step S324: and simultaneously pulling all the odd-numbered hydraulic supports forwards, and erecting a wood pile behind each odd-numbered hydraulic support.
In one optional technical solution, step S33 further includes the following steps:
and when the fully mechanized mining face passes through the coal seam thinning area in the bottom floor, the wood buttress is cut and removed by the coal cutter.
In one optional technical scheme, the width of the wood pile is equal to the cutting depth of the coal mining machine.
In one optional technical scheme, when the fully mechanized mining face passes through the coal seam thinning area in the bottom floor, one wood pile is removed after the coal mining machine cuts once, and the hydraulic support is pulled forward in time to support the top plate.
In one optional technical scheme, a metal net is laid on a hydraulic support of the fully mechanized mining face.
By adopting the technical scheme, the method has the following beneficial effects:
according to the coal mining method provided by the invention, the wood buttress is erected in advance in the first middle layer above the bottom layer, and the coal seam thinning area of the bottom layer is filled, so that the height of the mining space of the fully mechanized coal mining face is artificially increased, the rock of the bottom plate of the fully mechanized coal mining face can be prevented from being broken, the fully mechanized coal mining face can smoothly pass through the coal seam thinning area, and the coal in the coal seam thinning area is efficiently mined.
Drawings
FIG. 1 is a schematic illustration of an underlying coal seam having a coal seam thinning region;
FIG. 2 is a schematic view of a wood crib supported above a coal bed thinning area in a first intermediate tier;
FIG. 3 is a schematic view of a hydraulic support in a fully mechanized mining face;
FIG. 4 is a schematic view of the hydraulic mount of FIG. 3 with the tail boom removed;
FIG. 5 is a schematic view of a metal mesh laid over a hydraulic support;
FIG. 6 is a schematic view of one end of an I-steel being lapped on four connecting rods of odd-numbered hydraulic supports and the other end of the I-steel being inserted below a metal mesh false ceiling;
FIG. 7 is a schematic diagram of I-steel laid behind odd number hydraulic supports;
fig. 8 is a schematic view of a wood crib supported behind a hydraulic support.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1 to 8, a coal mining method provided by an embodiment of the present invention includes the following steps:
step S1: the thick coal seam is divided into a top sub-layer 1, a multi-layer middle sub-layer 2 and a bottom sub-layer 3 in advance.
Step S2: a coal seam thinning zone 31 in the bottom sub-layer 3 is detected in advance, and the middle sub-layer 2 above the bottom sub-layer 31 is referred to as a first middle sub-layer 2-1, and the middle sub-layer 2 above the first middle sub-layer 2-1 is referred to as a second middle sub-layer 2-2.
Step S3: wherein, the fully mechanized mining face 5 is adopted to carry out stoping on the top part layer 1, the middle layer 2 and the bottom part layer 3 in sequence.
Wherein, step S31: when the fully mechanized mining face 5 is mined and tunneled in the second middle layer 2-2, the I-shaped steel 9 is laid on the bottom plate of the second middle layer 2-2.
Step S32: when the fully mechanized coal mining face 5 is mined and tunneled in the first middle layer 2-1, a metal net 8 and a steel wire rope are laid below a top plate of the first middle layer 2-1, a plurality of rows of wood stacks 6 are sequentially erected on a bottom plate of the first middle layer 2-1 corresponding to a coal seam thinning area, and the wood stacks 6 are supported between the bottom plate and the top plate of the first middle layer 2-1.
Step S33: when the fully mechanized mining face 5 is excavated and tunneled at the bottom seam 3, the wood buttress 6 is removed when the fully mechanized mining face 5 passes through the coal seam thinning area 31, and the fully mechanized mining face 5 can smoothly pass through the coal seam thinning area 31 and the coal in the coal seam thinning area 31 is mined.
According to the coal mining method provided by the embodiment of the invention, the fully mechanized coal mining face 5 is adopted to carry out layered mining on the thick coal seam. The thick coal seam is a coal seam with the thickness of more than 8 m. The thick coal seam is divided into a top part layer 1, a plurality of middle layers 2 and a bottom part layer 3 from top to bottom in sequence. The lower part of the bottom sub-layer 3 is a rock stratum 4, and the rock stratum 4 is provided with a stratum convex part 41 which is convex towards the bottom sub-layer 3, so that the part of the bottom sub-layer 3 corresponding to the stratum convex part 41 is thinned, and a coal seam thinning area 31 is formed.
The location of the coal seam thinning zone 31 in the bottom seam 3 may be pre-detected by means of geophysical prospecting. For example, by drilling a hole through the drill rod or drill bit into the bottom sub-layer 3, when the hole is drilled to about 8m, if coal is drilled, the thickness of the bottom sub-layer 3 in the part is normal, and if rock or stone is drilled, the thickness of the bottom sub-layer 3 in the part is thin. The location of the coal seam thinning zone 31 in the bottom sub 3 may be obtained by drilling a plurality of boreholes.
For the sake of convenience of description, the intermediate layer 2 immediately above the bottom partial layer 3 will be referred to as a first intermediate layer 2-1, and the intermediate layer 2-1 immediately below the first intermediate layer 3 will be referred to as a second intermediate layer 2-1
The upper intermediate layer 2 is referred to as the second intermediate layer 2-2.
And the fully mechanized mining face 5 is adopted for mining of each layered coal seam, and the fully mechanized mining face 5 comprises a coal mining machine and a hydraulic support 7.
The hydraulic support 7 has a base, a roof beam 71, a shield beam 72, a tail beam 73 and a four-bar linkage 74. A hydraulic prop 75 is connected between the base and the top beam 71, a four-bar linkage 74 is hinged between the shield beam 72 and the base, a tail beam 73 is hinged at the rear side of the shield beam 72, and the tail beam 73 is connected with the four-bar linkage 74 through a hydraulic oil cylinder 76.
The description is as follows: during the fully mechanized mining of each layer, the metal mesh 8 is laid on the top beam 71, the shield beam 72 and the tail beam 73 of the hydraulic support 7 so as to form the metal mesh false roof 10 of the goaf in the subsequent process.
And in each stratified coal seam before the second middle stratum 2-2, the fully mechanized coal mining face 5 recovers according to normal coal mining steps.
When the fully mechanized mining face 5 enters the second intermediate level 2-2, the boundary of the coal seam thinning area 31 is marked in the transportation gateway or the return air gateway of the second intermediate level 2-2. And when the fully mechanized mining working surface 5 of the second middle layer 2-2 returns to the position above the coal seam thinning area 31, laying the I-shaped steel 9 on the bottom plate of the second middle layer 2-2. The I-steel 9 becomes the top plate of the first middle layer 2-1, and the I-steel can support the metal mesh false roof of the goaf, so that conditions are created for supporting the wood crib 6 in the goaf of the first middle layer 2-1 subsequently. The laying area of the I-shaped steel 9 is located right above the coal seam thinning area 31, and the area of the laying area of the I-shaped steel 9 is larger than that of the coal seam thinning area 31.
When the fully mechanized mining face 5 enters the first middle layer 2-1 for mining and tunneling, the boundary of the coal seam thinning area 31 is marked in the transportation gateway or the return air gateway of the first middle layer 2-1. And laying a metal net 8 and a steel wire rope below the top plate of the first middle layer 2-1, wherein the metal net 8 and the steel wire rope can be laid on the hydraulic support 5 of the fully mechanized mining face 5 of the first middle layer 2-1 in advance.
When the I-shaped steel laid on the bottom plate of the second middle layer 2-2 is uncovered in the fully mechanized mining face 5 of the first middle layer 2-1, the fully mechanized mining face 5 of the first middle layer 2-1 is located above the coal seam thinning area 31. And after the upper I-steel passes through the top beam 71 of the hydraulic support 7, an inverted cantilever beam is formed to support the metal mesh false roof of the goaf along the trend of the fully mechanized mining face 5. When the hydraulic support 7 of the fully mechanized mining face 5 of the first middle layer 2-1 is pulled, the wood buttress 6 is synchronously supported behind the hydraulic support 7, the wood buttress 6 is supported between the bottom plate and the top plate of the first middle layer 2-1, and the wood buttress 6 can support the I-steel above.
When the fully mechanized face 5 is excavated and tunneled in the bottom floor 3, the boundary of the coal seam thinning area 31 is marked in the transportation gateway or the return air gateway of the bottom floor 3. When the fully mechanized mining face 5 of the bottom floor 3 passes through the coal seam thinning area 31, the wood stacks 6 are removed, the top of the fully mechanized mining face 5 of the bottom floor 3 moves along a marking line 32 in fig. 2, the fully mechanized mining face 5 can smoothly pass through the coal seam thinning area 31, and coal in the coal seam thinning area 31 is mined, the fully mechanized mining face 5 is prevented from forcibly cutting by blasting loose rock and passing through the coal seam thinning area, potential safety hazards caused by blasting are avoided, safety production coefficients are improved, the process that the fully mechanized mining face 5 passes through the coal seam thinning area 31 is simplified, production efficiency is improved, labor intensity of workers is reduced, and mine output tasks are guaranteed to be completed as required. When the fully mechanized coal mining face 5 passes through the coal seam thinning area 31, only the wood buttress 6 needs to be removed, and damage to equipment such as a face coal mining machine and a scraper conveyor is avoided.
In one embodiment, the method further comprises the following steps:
when the fully mechanized coal mining face 5 is mined and tunneled in the middle layer 2 above the second middle layer 2-2, the metal net 8 and the steel wire rope are laid on the bottom plate of the middle layer 2, the strength of the metal net flexible false roof of the second middle layer 2-2 and the first middle layer 2-1 is increased, and conditions are created for supporting the wood buttress 6 behind the hydraulic support 7 of the fully mechanized coal mining face 5 of the bottom coal seam 3.
In one embodiment, when the fully mechanized mining face 5 recovers one intermediate layer 2 above the second intermediate layer 2-2, the boundary of the coal seam thinning area 31 is marked in the transportation gateway or the return air gateway of the intermediate layer 2 in advance.
When the fully mechanized coal mining face 5 is close to the coal seam thinning area 31, the double-layer metal net 8 is laid on the bottom plate behind the hydraulic support 7, the strength of the top plate of the second middle layer 2-2 is increased, and slag leakage is prevented. Meanwhile, steel wire ropes are paved along the working face at intervals of 0.5 m on the bottom plate behind the hydraulic support 7, and the steel wire ropes and the double-layer metal net are bound and fixed by double-strand No. 12 lead wires at intervals of 0.5 m. The purpose of laying the steel wire rope mainly comprises two aspects: firstly, the strength and rigidity of the top plate of the metal mesh flexible false roof of the working surface of the second middle layer 2-2 and the first middle layer 2-1 are increased, the sinking speed of the flexible metal mesh false roof is slowed down, and a foundation is laid for arranging a wood buttress 6 under the flexible metal mesh false roof in the goaf; secondly, the flexible metal mesh false roof is supported along the inclined direction of the working face, so that conditions are created for operators to support the wood crib 6 below the rear goaf of the hydraulic support 7.
In one embodiment, step S31 further includes the following steps:
the hydraulic supports 7 of the fully mechanized mining face 5 are sequentially divided into odd-numbered hydraulic supports and even-numbered hydraulic supports.
Firstly, pulling a first even-numbered hydraulic support forwards, laying H-shaped steel 9 behind the first even-numbered hydraulic support, then pulling a second even-numbered hydraulic support, laying H-shaped steel 9 behind the second even-numbered hydraulic support, and sequentially executing the steps until the H-shaped steel 9 is also laid behind the last even-numbered hydraulic support, wherein the odd-numbered hydraulic support lags behind the even-numbered hydraulic support Xm.
At least one I-steel 9 is arranged at the rear part of each odd-numbered hydraulic support, one end of each I-steel 9 is positioned on the four connecting rods 74 of the odd-numbered hydraulic support, the other end of each I-steel 9 is inserted below the metal mesh false roof 10 of the goaf, the odd-numbered hydraulic supports are pulled forwards in sequence, and the I-steel 9 is laid behind the odd-numbered hydraulic supports.
As shown in fig. 2-7, in order to support the wood crib 6 below the metal mesh false roof goaf behind the hydraulic support 7 of the fully mechanized working surface 5 of the first middle tier 2-1, i-steel 9 of 3.2 meters needs to be laid below the shield beam 72 of the hydraulic support 7 of the fully mechanized working surface 5 of the second middle tier 2-2. The safety distance below the shield beam 72 of the hydraulic support 7 is about 2.5 meters, and 3.2 meters of I-shaped steel 9 is too long to be laid at a position. In order to solve the problem, the I-shaped steel 9 is paved under two conditions of an odd number of hydraulic supports and an even number of hydraulic supports. In order to simplify the process of laying the I-steel 9, when the hydraulic supports 7 are pulled, the even-numbered hydraulic supports are sequentially pulled in sequence, for example: firstly, drawing the No. 2 hydraulic support, after the I-steel 9 behind the No. 2 hydraulic support is laid, drawing the No. 4 hydraulic support, and so on to draw all the even number hydraulic supports. At the moment, the odd-numbered hydraulic supports do not need to be pulled, the shielding beams 72 of the odd-numbered hydraulic supports lag behind by 0.8m, the metal mesh and the waste steel wire rope laid on the top plate can temporarily and effectively support the top plate which leads by 0.8m on the even-numbered hydraulic supports, and the I-steel 9 is quickly laid behind the even-numbered hydraulic supports. After the I-steel is laid behind the even-numbered hydraulic supports, when the I-steel 9 is laid behind the odd-numbered hydraulic supports, one end of the I-steel 9 is lifted to be placed on the four connecting rods 74 of the odd-numbered hydraulic supports, the other end of the I-steel is inserted below the metal net false roof 10 of the goaf, after a cycle of 0.8m is cut along with a coal cutter of the fully mechanized mining face 5, the even-numbered hydraulic supports are all pulled, finally the odd-numbered hydraulic supports are sequentially pulled, the odd-numbered hydraulic supports are pulled forward for 0.8m, and then the I-steel 9 is laid behind the odd-numbered hydraulic supports.
In order to ensure that the I-steel 9 continuously supports the metal mesh false roof 10, the I-steel 9 is alternately overlapped and paved on the bottom plate of the second middle layer 2-2, and the I-steel 9 is completely paved above the corresponding coal seam thinning area 31 in the same way.
In one embodiment, step S32 further includes the following steps:
the area of the first intermediate layer 2-1 above the coal seam thinning area 31 is referred to as the construction log area.
Before the fully mechanized mining face 5 enters the construction wood buttress area in the first middle layer 2-1, the tail beam 73 of the hydraulic support 7 is removed in advance.
The I-steel 9 laid on the bottom plate of the second middle layer 2-2 passes through the top beam 71 of the hydraulic support 7 of the first middle layer 2-1 and enters the inclined planes of the shield beam 72 and the tail beam 73, so that the span of supporting the goaf is increased, the space supporting of the wood crib 6 is very difficult to support, and the construction is not facilitated, so that the tail beam 73 of the hydraulic support 7 is removed in advance before entering the construction wood crib area, the supporting and top control distance is reduced, and conditions are created for arranging the wood crib 6 below the goaf.
In one embodiment, step S32 further includes the following steps:
the hydraulic supports 7 of the fully mechanized mining face 5 are sequentially divided into odd-numbered hydraulic supports and even-numbered hydraulic supports.
When a first row of wood stacks is erected:
step S321: the method comprises the steps of pulling a first even-numbered hydraulic support forwards and erecting a wood crib 6 behind the first even-numbered hydraulic support, then pulling a second even-numbered hydraulic support and erecting the wood crib 6 behind the second even-numbered hydraulic support, and sequentially executing the steps until the wood crib 6 is erected behind the last even-numbered hydraulic support.
Step S322: after wood piles 6 are arranged behind the even-numbered hydraulic supports, the first odd-numbered hydraulic support is pulled forwards, the wood piles 6 are arranged behind the first odd-numbered hydraulic support, the second odd-numbered hydraulic support is pulled, the wood piles 6 are arranged behind the second odd-numbered hydraulic support, and the steps are sequentially carried out until the wood piles 6 are arranged behind the last odd-numbered hydraulic support.
When a second row of wood stacks is erected:
step S321 and step S322 are repeatedly performed.
In the initial stage, the top plate of the goaf is supported by the I-steel 9, and in order to reduce the top control distance and ensure the safe construction of the wood crib 6 under the goaf, the hydraulic support is divided into an odd hydraulic support and an even hydraulic support to be pulled. The pulling frames of the odd-numbered hydraulic supports and the even-numbered hydraulic supports are sequentially grouped and pulled, each group only pulls one hydraulic support at a time, and when the distance of constructing one wood pile 6 is reached, the wood pile 6 is immediately constructed until the two rows of wood 6 are erected.
In one embodiment, step S32 further includes the following steps:
when setting up the wood pile 6 after the second row of wood piles:
step S323: all the even-numbered hydraulic supports are pulled forwards at the same time, and a wood stack 6 is arranged behind each even-numbered hydraulic support.
Step S324: simultaneously all the odd hydraulic supports are pulled forwards, and a wood stack 6 is arranged behind each odd hydraulic support.
After two rows of wood piles 6 are constructed under the goaf, one end of the I-steel 9 is supported by the hydraulic support 7, the other end of the I-steel is supported by the wood piles 6, the space of the constructed wood piles 6 is effectively supported, and then the pulling frames can be sequentially pulled in groups.
In one embodiment, step S33 further includes the following steps:
the shearer removes the wood stacks 6 as the fully mechanized face 5 passes through the coal seam thinning zone 31 in the bottom seam 3.
When the fully mechanized mining face 5 reveals the wood pile, a method of manually removing the wood pile or directly cutting the wood pile by using a coal mining machine is adopted to ensure that the fully mechanized mining face 5 smoothly passes through the coal seam thinning area 31.
In one of the embodiments, the width of the pack 6 is equal to the cutting depth of the shearer. The width of the wood pile 6 is 0.8m, and the single cutting depth of the coal mining machine is 0.8 m. When the wood flowers 6 are erected, the coal mining machine erects one wood flower 6 every cycle. When the wood 6 is removed, the coal mining machine removes one wood 6 every cycle.
In one embodiment, when the fully mechanized mining face 5 passes through the coal seam thinning area 31 in the bottom seam 3, the shearer removes one wood crib 6 per cutting and pulls the hydraulic support 7 forward in time to support the roof.
In one embodiment, a metal mesh 8 is laid on the hydraulic support 7 of the fully mechanized mining face 5. A metal net 8 is laid on the hydraulic support 7, and when a mining empty area is formed after stoping, the metal net forms a flexible metal net false roof 10.
If necessary, a double-layer metal net may be laid on the top plate of each layer corresponding to the coal seam thinning area 31.
According to the requirement, a double-layer metal net can be directly paved on the bottom plate of each layer corresponding to the coal seam thinning area 31.
In summary, in the coal mining method provided by the invention, the wood stacks are erected in advance in the first middle layer above the bottom layer, and the coal seam thinning area of the bottom layer is filled, so that the height of the mining space of the fully mechanized coal mining face is artificially increased, the rock of the bottom plate of the fully mechanized coal mining face can be prevented from being broken, the fully mechanized coal mining face can smoothly pass through the coal seam thinning area, and the coal in the coal seam thinning area is efficiently mined.
According to the needs, the above technical schemes can be combined to achieve the best technical effect.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.
Claims (10)
1. A coal mining method is characterized by comprising the following steps:
step S1: dividing a thick coal seam into a top part layer, a plurality of middle layers and a bottom part layer in advance;
step S2: detecting a coal seam thinning area in the bottom part of the layer in advance, wherein a middle layer above the bottom part of the layer is called a first middle layer, and a middle layer above the first middle layer is called a second middle layer;
step S3: adopting a fully mechanized mining face to sequentially carry out mining on the top part layer, the middle layer and the bottom part layer;
wherein, step S31: when the fully mechanized mining face is mined and tunneled in the second middle layer, I-shaped steel is laid on the bottom plate of the second middle layer;
step S32: when the fully mechanized coal mining face is mined and tunneled in the first middle layer, a metal net and a steel wire rope are laid below a top plate of the first middle layer, a plurality of rows of wood piles are sequentially erected on a bottom plate of the first middle layer corresponding to the coal seam thinning area, and the wood piles are supported between the bottom plate and the top plate of the first middle layer;
step S33: when the fully mechanized mining face is in the bottom partial layer mining and tunneling, the wood buttress is removed when the fully mechanized mining face passes through the coal seam thinning area, the fully mechanized mining face can smoothly pass through the coal seam thinning area, and the coal in the coal seam thinning area is mined.
2. A method of mining coal according to claim 1, further comprising the steps of:
and when the fully mechanized mining face carries out mining and tunneling in the middle layering on the layer above the second middle layering, a metal net and a steel wire rope are laid on the bottom plate of the middle layering.
3. A coal mining method according to claim 1, characterized in that step S31 further includes the steps of:
dividing a hydraulic support of a fully mechanized mining face into an odd hydraulic support and an even hydraulic support in sequence;
firstly, pulling a first even-numbered hydraulic support forwards and laying I-steel behind the first even-numbered hydraulic support, then pulling a second even-numbered hydraulic support and laying I-steel behind the second even-numbered hydraulic support, and sequentially executing the steps until I-steel is also laid behind the last even-numbered hydraulic support, wherein the odd-numbered hydraulic support lags behind the even-numbered hydraulic support Xm;
and arranging at least one I-steel at the rear part of each odd-numbered hydraulic support, wherein one end of the I-steel is positioned on the four connecting rods of the odd-numbered hydraulic support, the other end of the I-steel is inserted below the metal mesh false roof of the goaf, the odd-numbered hydraulic supports are pulled forwards in sequence, and the I-steel is laid behind the odd-numbered hydraulic supports.
4. A coal mining method according to claim 1, characterized in that step S32 further includes the steps of:
the area, positioned above the coal seam thinning area, in the first middle layer is called a construction wood buttress area;
and before the fully mechanized mining face enters the construction wood buttress area in the first middle layer, the tail beam of the hydraulic support is detached in advance.
5. A coal mining method according to claim 4, characterized in that step S32 further includes the steps of:
dividing a hydraulic support of a fully mechanized mining face into an odd hydraulic support and an even hydraulic support in sequence;
when a first row of wood stacks is erected:
step S321: pulling a first even-numbered hydraulic support forwards and erecting a wood pile behind the first even-numbered hydraulic support, then pulling a second even-numbered hydraulic support and erecting a wood pile behind the second even-numbered hydraulic support, and sequentially executing the steps until the wood pile is erected behind the last even-numbered hydraulic support;
step S322: after wood stacks are arranged behind the even-numbered hydraulic supports, the first odd-numbered hydraulic support is pulled forwards and the wood stacks are arranged behind the first odd-numbered hydraulic support, then the second odd-numbered hydraulic support is pulled and the wood stacks are arranged behind the second odd-numbered hydraulic support, and the steps are sequentially executed until the wood stacks are arranged behind the last odd-numbered hydraulic support;
when a second row of wood stacks is erected:
step S321 and step S322 are repeatedly performed.
6. A coal mining method according to claim 5, characterized in that when erecting a pack after the second row of packs:
step S323: simultaneously pulling all the even-numbered hydraulic supports forwards, and erecting a wood pile behind each even-numbered hydraulic support;
step S324: and simultaneously pulling all the odd-numbered hydraulic supports forwards, and erecting a wood pile behind each odd-numbered hydraulic support.
7. A coal mining method according to claim 1, characterized in that step S33 further includes the following steps:
and when the fully mechanized mining face passes through the coal seam thinning area in the bottom floor, the wood buttress is cut and removed by the coal cutter.
8. A method according to claim 7, wherein the width of the sheaf is equal to the cutting depth of the shearer.
9. A coal mining method according to claim 8,
when the fully mechanized mining face passes through the coal seam thinning area in the bottom floor, the wood pile is removed once the coal mining machine cuts, and the hydraulic support is pulled forward in time to support the top plate.
10. A coal mining method according to claim 1, characterized in that a metal mesh is laid on the hydraulic supports of the fully mechanized face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011007525.XA CN112127887B (en) | 2020-09-23 | 2020-09-23 | Coal mining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011007525.XA CN112127887B (en) | 2020-09-23 | 2020-09-23 | Coal mining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112127887A true CN112127887A (en) | 2020-12-25 |
| CN112127887B CN112127887B (en) | 2022-07-26 |
Family
ID=73842708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011007525.XA Active CN112127887B (en) | 2020-09-23 | 2020-09-23 | Coal mining method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112127887B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140019047A1 (en) * | 2011-03-30 | 2014-01-16 | China University Of Mining And Technology | Multi-information coupling prediction method of coal and gas outburst danger |
| CN105003269A (en) * | 2015-08-11 | 2015-10-28 | 贵州理工学院 | Mining method for long wall working face of ultra thick seam |
| CN105715272A (en) * | 2016-04-06 | 2016-06-29 | 中国神华能源股份有限公司 | Fully-mechanized caving mining method for lower slice of ultra-thick hard coal |
| CN109098713A (en) * | 2018-08-29 | 2018-12-28 | 国家能源投资集团有限责任公司 | A kind of method in the lane Guo Kong |
-
2020
- 2020-09-23 CN CN202011007525.XA patent/CN112127887B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140019047A1 (en) * | 2011-03-30 | 2014-01-16 | China University Of Mining And Technology | Multi-information coupling prediction method of coal and gas outburst danger |
| CN105003269A (en) * | 2015-08-11 | 2015-10-28 | 贵州理工学院 | Mining method for long wall working face of ultra thick seam |
| CN105715272A (en) * | 2016-04-06 | 2016-06-29 | 中国神华能源股份有限公司 | Fully-mechanized caving mining method for lower slice of ultra-thick hard coal |
| CN109098713A (en) * | 2018-08-29 | 2018-12-28 | 国家能源投资集团有限责任公司 | A kind of method in the lane Guo Kong |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112127887B (en) | 2022-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102619513B (en) | Room and pillar type medium-length hole filling mining method using bottom ore withdrawal structures simultaneously arranged in original rock | |
| EA037982B1 (en) | Method for pillarless mining with self-preserving development without roadway development at mining area | |
| CN111878080B (en) | Method for equipment withdrawal and self-lane-forming of withdrawal channel of fully mechanized coal mining face of coal mine | |
| WO2016206616A1 (en) | Equipment system for no-roadway no-coal-pillar retained roadway mining method | |
| CN107178384A (en) | The advanced telescopic cantilever suspension device of tunnelling and its construction method | |
| CN102953732A (en) | Room-and-pillar major-diameter longhole inverted-step-like segmented lateral caving subsequent filling mining method | |
| CN103410515A (en) | Three-soft-coal-layer reciprocating-type coal-pillar-free fully-mechanized mining method | |
| CN106437582A (en) | Wireline coring tool and a new green method instead of groove well detective | |
| CN109209490B (en) | Working face withdrawing method for gangue filling auxiliary end mining stage | |
| CN108194114A (en) | Roadway head protects top and anchor bolt construction integrated apparatus temporarily | |
| CN110145311A (en) | Thick or thick phosphorus ore body underground mining method in a kind of low-angle dip | |
| CN102418528B (en) | End ore-drawing caving mining technology with steel concrete composite man-made false roofs | |
| CN109882172A (en) | A kind of cut falls the gob-side entry retaining method that roadside support wall is done on directly top | |
| CN112647947B (en) | Non-coal-pillar mining method for mining area | |
| CN212716647U (en) | Arrangement system of pre-digging withdrawing channel | |
| CN113605893A (en) | Control method for pre-filled completely gob-side entry driving surrounding rock | |
| CN112127887B (en) | Coal mining method | |
| CN108952715B (en) | Gob-side entry driving top coal supporting and reinforcing method for inclined thick/extra-thick coal seam entry top | |
| CN111894667A (en) | Upward double-layered drift filling mining method for recoverable support shield of broken ore body | |
| CN114352282B (en) | Short-distance auxiliary-roadway-free single-channel safe withdrawal method for near high-risk coal pillars | |
| CN102419139B (en) | Bottom-post-free sublevel caving method adopting reinforced concrete structure artificial false roof | |
| CN115637978A (en) | Method for protecting caving, filling and mining and gob-side entry retaining under coal pillar | |
| CN113622916B (en) | Stope point column supporting and reinforcing and recycling method | |
| CN112879073B (en) | Water injection method for exploiting coal seam or rock stratum in underground coal mine | |
| CN114575844A (en) | Roadway roof segmented pressure relief and reinforcement control method based on double-roadway excavation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |