CN112196616B - End mining and rapid withdrawal method for fully mechanized mining face of underground coal mine - Google Patents
End mining and rapid withdrawal method for fully mechanized mining face of underground coal mine Download PDFInfo
- Publication number
- CN112196616B CN112196616B CN202011239650.3A CN202011239650A CN112196616B CN 112196616 B CN112196616 B CN 112196616B CN 202011239650 A CN202011239650 A CN 202011239650A CN 112196616 B CN112196616 B CN 112196616B
- Authority
- CN
- China
- Prior art keywords
- fully mechanized
- net
- withdrawing
- channel
- mining
- 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.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/006—Equipment transport systems
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/06—Transport of mined material at or adjacent to the working face
Abstract
The invention discloses a method for end mining and rapid withdrawal of a fully mechanized mining face of an underground coal mine, which comprises the following steps of S1, fully mechanized mining face arrangement; s2, performing final mining protection; s3 the fully mechanized mining face is quickly retracted; the invention optimally designs protective measures when the roadway is retracted, the fully mechanized face is not fully mined and the fully mechanized face is retracted, reduces the tunneling and supporting cost of the auxiliary retraction channel, obviously slows down the sinking speed of the top plate of the retraction channel, obviously reduces the bottom heave amount of the roadway, reduces the labor intensity, shortens the retraction time, improves the safety performance, can reuse the auxiliary retraction channel for the second time, realizes the environment-friendly discharge of solid wastes, and reduces the discharge cost of the solid wastes.
Description
The technical field is as follows:
the invention relates to a fully mechanized coal mining face end mining and rapid withdrawal method for an underground coal mine, and belongs to the technical field of underground coal mine coal mining.
Background art:
during underground mining work, the coal face is usually arranged in a mode shown in figure 1 and comprises a mining area auxiliary main roadway (1), a mining area glue transportation main roadway (2), a mining area air return main roadway (3), a glue transportation gateway (4), an air return gateway (5), a main withdrawing channel (6), an auxiliary withdrawing channel (7), a connecting roadway (8), an eye cutting roadway (9), a working face air return bypass (10) and the like.
A large roadway belt conveyor for conveying the coal mined from the fully mechanized working face to the ground is arranged in the mining area rubber conveying large roadway (2); a transfer conveyor and a gate belt conveyor (arranged close to one side of the rubber transportation gate roadway) are arranged in the rubber transportation gate (4), and the coal mined from the fully mechanized mining face is transferred to a gate belt conveyor of the mining area rubber transportation gate (2); a monorail crane (a pipeline for hanging the fully mechanized mining equipment, the pipeline can be unfolded and contracted on the monorail crane to facilitate the propulsion of the fully mechanized mining equipment), an equipment train (arranged close to the return air along the side of the next fully mechanized mining working surface), and the like are arranged in the glue conveying crossheading (4) and parallel to the crossheading belt conveyor, so that a power supply and hydraulic pump station system of the fully mechanized mining working surface is formed; a scraper conveyer, a coal mining machine and a hydraulic support are arranged in the open-off roadway (9) and are used for coal mining operation of a fully mechanized mining face; the mining area air return main roadway (3) is communicated with the air return gateway (5) through a working face air return bypass (18), and the mining area glue transportation main roadway (2), the glue transportation gateway (4), the hole cutting roadway (9), the air return gateway (5), the working face air return bypass (10) and the mining area air return main roadway (3) form communicated spaces for transportation, ventilation and the like during coal mining of a fully mechanized mining working face.
The fully mechanized coal mining face adopts backward coal mining, and in the process of pushing the fully mechanized coal mining face from the hole cutting roadway (9) to the main withdrawing channel (6) to produce, the mined coal is unloaded onto a belt conveyor arranged in a mining area main roadway (2) through a scraper conveyor, a transfer conveyor arranged in a rubber conveying gateway (4) and a gateway belt conveyor and is gradually conveyed to the ground. And the fully mechanized coal mining face is continuously pushed towards the main withdrawing channel (6) until the fully mechanized coal mining face is communicated with the main withdrawing channel (6), and coal mining of the fully mechanized coal mining face is finished.
After the coal mining of the fully mechanized mining face is finished, the reversed loader, the crossheading belt conveyor, the monorail crane, the equipment train, the scraper conveyor, the coal mining machine and the hydraulic support all need to be retracted, and the traditional retraction mode is as follows: net hanging at the end of fully mechanized mining face and equipment withdrawal at the fully mechanized mining face; when the distance from the main withdrawing channel is only 13.5 meters, an upper net anchor rod (anchor cable) is arranged at the top end of the fully mechanized mining surface → an upper net steel wire rope is installed → net transporting → upper net and networking → net collecting → coal cutting and net laying → net pressing anchor rod is arranged → coal gangue is cleaned. There are problems in that:
firstly, the method comprises the following steps: the number of operators is large, except two procedures of collecting the net, cutting the coal and laying the net, the time of the operators exposed to the coal wall of the fully-mechanized coal face and the hollow top range of the front beam of the hydraulic support in the other procedures is long, potential unsafe factors are large, and the safety threat to the operators is large.
Secondly, the method comprises the following steps: before the coal cutting and net laying processes, an upper net anchor rod is arranged, an upper net steel wire rope is installed, net surfing and networking are carried out, the frequency of the operation personnel needing to ascend is very high, a proper ascending tool with high safety is not provided, potential unsafe factors are increased, and the safety of the operation personnel is threatened.
Thirdly, the method comprises the following steps: during surfing the net and networking, the net roll is lifted by frequently lifting the hydraulic support, the management of the top plate of the fully mechanized mining face is extremely unfavorable, potential safety hazards are more, local roof fall accidents occur easily, and the personal safety of operating personnel is seriously threatened.
The fully mechanized mining face equipment withdrawal is that after the fully mechanized mining is finished, an opening is formed in the position of a communication roadway, all the equipment on the fully mechanized mining face is withdrawn, withdrawal operation is divided into two groups, and operation is carried out in a back direction from the position of a middle opening. And the withdrawing equipment is conveyed out of the shaft from the side of the return air crossheading.
The problem of the withdrawal of the fully mechanized mining face equipment is that:
firstly: the traditional withdrawal roadway is unreasonable in design, the mine pressure around the withdrawal passage is obvious in the final mining period, the dynamic pressure of the top plate of the withdrawal of the main withdrawal passage and the auxiliary withdrawal passage on the fully-mechanized mining surface has obvious influence on the lower bottom drum, and the concrete bottom plate loses the auxiliary transportation function; the concrete bottom plates around the withdrawing channel need to be completely excavated, the roadway bottom plate is restored again, the withdrawing period of the fully mechanized mining face equipment is prolonged due to the adverse effect of the peripheral auxiliary transportation system, the major withdrawing channel continues to bottom bulge, so that the withdrawing of the hydraulic support is seriously affected, and the withdrawing period is prolonged more smoothly.
Secondly, the method comprises the following steps: the outward transport route of the withdrawing equipment at the machine head side of the scraper conveyor is single, and the withdrawing speed is obviously restricted.
Thirdly, the steps of: the important work in the early stage of withdrawing is forced to be put on the withdrawing rubber conveying gateway side equipment by the scraper conveyor head side team, the equipment in the fully mechanized mining face cannot be withdrawn earlier, along with the loss of time, the ore pressure display such as the sinking of a top plate, the bottom drum of a bottom plate and the like is obvious, and the influence of different degrees is brought to the safe withdrawing of the fully mechanized mining face equipment on the next step.
Fourthly: the net pressing anchor rod is poor in pre-tightening effect, the anchor rod tray is small in area, and the top leakage phenomenon of the net pressing anchor rod due to the fact that the net edge is separated from the net pressing anchor rod often occurs during withdrawal.
Fifth: when the withdrawal period of the fully mechanized mining surface is prolonged to more than 30 days, the sealing of the goaf of the fully mechanized mining surface is affected to different degrees, and the fire prevention and extinguishing management of the goaf is not facilitated.
Based on the problems, a new design mode of a withdrawing roadway and a new withdrawing method capable of quickly and safely withdrawing the fully mechanized coal mining face of the underground coal mine are urgently needed to be researched.
The invention content is as follows:
the invention aims to provide a method for fully mechanized mining face end mining and rapid withdrawal of an underground coal mine.
The invention is implemented by the following technical scheme: a method for end mining and rapid withdrawal of a fully mechanized mining face of an underground coal mine comprises S1, layout of a fully mechanized mining face; s2, final mining protection; s3, quickly withdrawing the fully mechanized coal mining face; wherein
S1, fully mechanized coal mining face arrangement: before the underground coal mine is mined, a fully mechanized coal mining face is excavated, a withdrawing channel of the fully mechanized coal mining face adopts the design of a main withdrawing channel and an auxiliary withdrawing channel, the width of a coal pillar between the main withdrawing channel and the auxiliary withdrawing channel is at least 50 meters, a plurality of connecting roadways are arranged between the main withdrawing channel and the auxiliary withdrawing channel, adjacent connecting roadways are arranged between the adjacent connecting roadways, and the connecting roadways and the glue transportation gateway are arranged, and the distance between each connecting roadway and the return air gateway is at least 65 meters;
a retraction connecting roadway is communicated between the main retraction channel and the main retraction channel of the next fully mechanized mining face, and a measure connecting roadway is communicated between the auxiliary retraction channel and the auxiliary retraction channel of the next fully mechanized mining face;
the anchor cables on the top plate of the main withdrawing channel are arranged asymmetrically, a row of anchor cables are arranged on the central line of the main withdrawing channel, a row of anchor cables are arranged on the top plate of one side, close to the cut-out tunnel, of the main withdrawing channel, two rows of anchor cables are arranged on the top plate of one side, close to the cut-out tunnel, of the main withdrawing channel, and the distance between the row of anchor cables close to the cut-out tunnel and the adjacent coal pillars is 200 mm and 300 mm;
s2, final mining protection: s2.1, setting an internet anchor cable; s2.2, transporting the network; s2.3, surfing the Internet and networking; s2.4, collecting the net; s2.5, cutting coal and paving a net; s2.6, pressing the net edge; wherein
S2.1, setting an internet anchor cable: when the distance from the main withdrawing channel is only 13.5 meters, the fully mechanized face enters into a final mining period, a row of net-surfing anchor rods or anchor cables are arranged at the beam ends of the front beams of the hydraulic supports and at the positions of gaps between the front beams of the two adjacent hydraulic supports along the length direction of the scraper conveyor, chain rings are sleeved on the anchor rods or the anchor cables, and then locks are installed for fixing;
s2.2, net transportation: transporting the net roll to a fully mechanized mining surface to prepare for surfing the net;
s2.3, networking and connecting: step one, arranging winches on a support, uniformly penetrating each winch steel wire rope from the lower part of a net roll, penetrating the winch steel wire rope from the middle of a chain ring on an upper net anchor rod or an anchor cable, and then bundling the winch steel wire rope on a net roll; secondly, uniformly and sequentially tightening the winch steel wire ropes, wherein one end of the net roll is driven by the net fixing steel wire rope, and the net fixing steel wire rope is pulled by the winch steel wire rope until the net fixing steel wire rope is tightly attached to a chain ring on the net-surfing anchor rod or the anchor cable and stops; thirdly, binding the net fixing steel wire rope on the chain ring by using a fixing belt;
s2.4, collecting the net: rotating the winch, tightening the winch steel wire rope, and storing the net coil at the lower part of the bracket;
s2.5, coal cutting and lapping: after coal is cut, the winch is rotated before the frame is moved, net rolls within the range of 15 adjacent hydraulic supports are sequentially dropped, and after the hydraulic supports are moved, the nets are sequentially retracted until the net rolls are communicated with the main withdrawing channel;
s2.6, pressing the net edge: after the coal wall of the fully mechanized mining face is dug through, firstly removing a row of locks of the anchor cables close to the cut tunnel and an anchor cable tray, wherein the row of anchor cables are used as net pressing anchor cables; then the net edge of the net roll penetrates through the anchor cable and is tightly attached to the top plate steel belt, then the anchor cable tray and the lockset are sleeved again, and the net pressing anchor cable is pre-tightened;
s3 quick retraction of the fully mechanized mining face: opening from the position of the connecting roadway at the middle position, withdrawing all the equipment on the fully mechanized mining face, dividing the withdrawing operation into two groups, carrying out the operation from the position of the middle opening back to the operator, conveying the withdrawn equipment out of the withdrawing connecting roadway by a group of personnel at one side close to the head of the scraper conveyor, and conveying the return air of the next fully mechanized mining face out of the chute to lift the shaft; and a group of personnel at one side close to the tail of the scraper conveyor transport the withdrawn equipment out of the return air crossheading of the fully mechanized mining face and transport the equipment out of the well.
Further, the measure connection roadway is an arc roadway, the measure connection roadway is tangent to the glue transportation gateway, and the measure connection roadway is located in a space between the tangent point and the mining area glue transportation main roadway.
Furthermore, the auxiliary withdrawing channel of the next fully-mechanized mining face comprises an auxiliary straight channel and an auxiliary inclined channel which are communicated, the auxiliary inclined channel is arranged close to one side of the return air crossheading of the next fully-mechanized mining face, and the auxiliary inclined channel is gradually inclined towards the direction of the mining area glue transportation main roadway from one end communicated with the auxiliary straight channel to the other end; and one end of the measure connecting roadway, which is communicated with the return air gateway of the next fully mechanized mining face, extends outwards and is tangent and communicated with the auxiliary inclined channel.
Further, when the fully mechanized face is 200 meters away from the main withdrawing channel, a stack type support is arranged in the main withdrawing channel to strengthen the supporting strength of the top plate.
Further, in S2.3 internet access and networking: when the fixing net steel wire rope is bound on the chain ring by the fixing belt, the top end of the ascending ladder is hung on the hanging ring of the support by adopting an ascending ladder manually, the lower part of the ascending ladder is close to the net roll and is arranged at the lower part of the support, and the ascending operation is carried out manually.
Further, the S3 rapid retraction of the fully mechanized coal mining face includes:
s3.1: a group of personnel close to one side of the head of the scraper conveyor synchronously disassemble the outward-conveying coal mining machine, disassemble the head (the tail) of the scraper conveyor and a chain and a chute of a withdrawing scraper conveyor in a first step, and interpenetrate the chain and the chute of the withdrawing rubber conveying in-groove conveyer; secondly, withdrawing the stack type support and the chute of the scraper conveyor which are arranged in the main withdrawing channel and close to one side of the hydraulic support on the fully mechanized face, and directly driving the frame vehicle into the main withdrawing channel to load the stack type support when conditions allow, so that the withdrawing speed is accelerated, and the smooth path of the hydraulic support in the fully mechanized face is ensured; thirdly, reversely and crossly withdrawing the hydraulic support and the rest row of stacking supports from the middle connecting roadway until all the fully mechanized coal mining face equipment on one side of the scraper conveyor head, such as the shielding frame, is withdrawn finally; fourthly, ending;
s3.2: a set of personnel near one side of the tail of the scraper conveyor: step one, intensively withdrawing a scraper chain of a scraper conveyer; secondly, withdrawing the stack type support and the chute of the scraper conveyor which are arranged at one side of the main withdrawing channel close to the hydraulic support on the fully mechanized mining face, and ensuring the smooth path of the hydraulic support in the fully mechanized mining face; thirdly, reversely and crossly withdrawing the hydraulic support and the rest row of stack type supports from the second connecting roadway until all the equipment in the fully mechanized mining face at the tail side of the scraper conveyor such as the shield frame and the like are finally withdrawn; and fourthly, ending.
The invention has the advantages that:
the invention optimally designs the withdrawal tunnel, has the advantages of accelerating the tunneling speed of the withdrawal tunnel, obviously reducing the tunneling and supporting cost of the auxiliary withdrawal tunnel, adjusting the width of coal pillars, reducing the number of connecting tunnels, obviously slowing down the sinking speed of the top plate of the withdrawal tunnel according to the stack type support selected by an empirical formula, obviously reducing the bottom heave amount of the tunnel, providing a stable, safe and reliable withdrawal operation environment for the withdrawal operation of the fully mechanized mining face, and providing a fundamental technical guarantee for the smoothness of the peripheral auxiliary transportation system and the auxiliary transportation system in the withdrawal tunnel.
The invention optimally designs the protective measures of the fully mechanized face in the final mining process, and has the advantages of
Firstly, a link of installing an internet wire rope is omitted; the time of the internet surfing and the networking links is compressed to be 3 hours, and the internet surfing and the networking links can be finished easily; the compression of the net pressing side ring sections can be easily finished within 2 hours, and the net pressing quality is obviously improved.
Secondly, the method comprises the following steps: the time of the operator exposed to the fully mechanized face coal wall and the hydraulic support front beam empty roof is reduced, and the potential safety threat to the operator is reduced.
Thirdly, the method comprises the following steps: the ascending operation frequency of operators in the links of setting an Internet anchor rod, installing an Internet wire rope, surfing, networking and the like is obviously reduced, and the application of the ascending ladder provides convenience for ascending operation and is safer and more reliable.
Fourthly: during surfing the net and networking, the net roll is not lifted in a mode of lifting a hydraulic support, the stability of the operation environment is guaranteed, and safe operation is facilitated.
Fifth, the method comprises the following steps: the labor intensity is obviously reduced.
The invention optimizes the withdrawing operation of the fully mechanized mining face and has the advantages of
Before entering the final mining preparation period, the fully mechanized mining face equipment train is separated out of the rubber conveying chute through the measure connecting roadway and stored in an auxiliary withdrawing channel of the next fully mechanized mining face, and the amount of monorail crane pipelines influencing withdrawing of the reversed loader only accounts for 1/3 of the original workload. Therefore, equipment such as the equipment train, the monorail crane pipeline, the reversed loader and the like become peripheral equipment, and the equipment can be arranged at the last withdrawal, so that the withdrawal cycle of the fully mechanized mining face equipment is directly shortened by 2 days.
The floor heave in and around the main withdrawal passage is significantly reduced: because the width of the coal pillar is increased, the number of the connecting roadways is reduced, the working resistance of the stack support is obviously increased, the bottom heave quantity in and around the main withdrawing channel is obviously reduced, powerful conditions are provided for the special vehicle loading vehicle to directly enter the main withdrawing channel to load and transport the stack support and the hydraulic support, and the decisive action is played for accelerating the withdrawing speed.
A withdrawal connection lane is reserved: firstly, a safety outlet at the side of a glue transportation crossheading is not required to be opened, but parallel operation is directly started from a withdrawal connecting roadway and a third connecting roadway, firstly, a coal mining machine is disassembled and transported outwards, secondly, a scraper conveyor head (a reversed loader tail) and a withdrawal scraper conveyor chain and a chute are disassembled, and the withdrawal scraper conveyor chain and the chute in the glue transportation crossheading can be interpenetrated; and secondly, equipment in the fully mechanized mining surface is withdrawn as early as possible, the bottom drum of a withdrawal channel bottom plate is effectively controlled, the transportation mode of the stack type support and the hydraulic support in the withdrawal channel is directly changed into special vehicle loading transportation from winch consignment, and the transportation speed of the hydraulic support and the stack type support in the withdrawal channel is greatly improved. In this way, the withdrawal speed is faster, which lays a solid foundation for significantly reducing the withdrawal period.
The peripheral auxiliary transportation route and the auxiliary transportation route in the withdrawing channel are smooth, and convenience is provided for quick withdrawing operation. Even if the bottom bulge of the concrete bottom plate is locally influenced, the treatment period is obviously shortened due to the fact that the concrete precast block is prepared in advance, and the treatment effect is very obvious.
And the auxiliary withdrawing channel can be reused for the second time, so that the environment-friendly discharge of the solid waste is realized, and the discharge cost of the solid waste is reduced.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a fully mechanized mining face of a traditional well-industry coal mine;
FIG. 2 is a drawing of the embodiment 1, a design of a withdrawing roadway of a fully mechanized coal mining face of a well-working coal mine;
FIG. 3 is a sectional view of a main withdrawing passage of the fully mechanized coal mining face in the underground coal mine in the embodiment 1;
FIG. 4 is a sectional view of an auxiliary withdrawal passage of the fully mechanized coal mining face of the underground coal mine in the embodiment 1;
FIG. 5 is a sectional view of an operation site before the well coal mine is mined and the operation site is on line in example 1;
FIG. 6 is a schematic view showing the threading direction of a winch cable when the fine coal mine is mined to the Internet in example 1;
FIG. 7 is a diagram of the operation of networking and ascending during the mining of fine coal mine in the well-worker in example 1;
FIG. 8 is a schematic diagram of the well-worker coal mine end mining after net recovery in example 1;
FIG. 9 is a schematic view of a flow field of a net edge pressing process after the mining of the fine coal mine of the underground mining in example 1;
FIG. 10 is the special ascending ladder for hanging and pressing the net in the mining of the coal mine end of the well worker in the embodiment 1;
FIG. 11 is a left side view of FIG. 10;
FIG. 12 is a drawing of the embodiment 2, a design of a fully mechanized coal mining face withdrawal roadway;
FIG. 13 is a sectional view of an auxiliary withdrawing passage of the fully mechanized coal mining face of the underground coal mine in the embodiment 2;
FIG. 14 is a sectional view of a main withdrawal passage of the fully mechanized coal mining face of the underground coal mine in the embodiment 2;
FIG. 15 is a cross-sectional view of an operation site before the well working coal mine is mined in example 2;
FIG. 16 is a schematic view of the direction of wire rope threading during mining of coal mine ends for mining in example 2;
FIG. 17 is a schematic diagram of the embodiment 2 after net recovery during mining of fine coal mine;
FIG. 18 is a schematic view of a flow field of a net edge pressing process after mining of the fine coal of the underground mining in example 2;
fig. 19 is a view of the driving position of the internet bolting in embodiment 2;
fig. 20 is a diagram of the position where the wire rope for the internet is inserted in embodiment 2.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example 1:
in this embodiment, the fully mechanized mining face of the khaki coal mine 31313 is taken as an example, and the operation is described by adopting the roadway design and the retraction mode of the present invention.
The hokka mother coal mine 31313 fully mechanized mining face: the width of the working face is 290 meters, the average mining height is 5.2 meters, and the fully mechanized mining face is provided with a scraper conveyor (300 meters), a coal mining machine and a hydraulic support 170; a reversed loader and a belt conveyor are arranged at the side of the glue conveying straight-through groove connected with the fully mechanized mining face, and a monorail crane (the maximum length is 150 meters, the minimum length is 75 meters) and an equipment train (comprising 38 carriages and 200 meters) are arranged in parallel with the belt conveyor; 31313 the fully mechanized coal mining face has a propelling length of 3009 m.
1. Designing a withdrawal roadway:
as shown in fig. 2, the underground coal mine fully-mechanized face is not mined and withdrawn, a reserved double-channel multi-head withdrawal operation mode is adopted, double withdrawal channels are excavated before the fully-mechanized face is subjected to coal mining, the width of a coal pillar between a main withdrawal channel and an auxiliary withdrawal channel is 50 meters, and 3 connection lanes are arranged between the main withdrawal channel and the auxiliary withdrawal channels (the number of the connection lanes is reduced to 3, so that the damage to the integrity of the coal pillar is reduced, the stability and the supporting effect of the coal pillar are ensured, the motion sinking amount of a top plate around the withdrawal channels is further reduced, the mine pressure display degree is reduced as much as possible, and the operation mode is particularly important for reducing the sinking amount of the top plate and ensuring the continuous playing of anchor net cable support. When the fully mechanized face enters the preparation period of final mining (namely, the distance is 200 meters left from the main withdrawing passage), a stack type bracket is arranged in the main withdrawing passage to strengthen the roof supporting strength.
An optimized support design is adopted in the main withdrawing channel (see figure 3): the anchor cables on the top plate of the main withdrawing channel are arranged asymmetrically, and particularly, the anchor cables are pre-arranged with net pressing anchor cables. Thus, the method comprises the following steps: firstly, the supporting density of the roof anchor cable at the through side is increased, the suspension effect of the anchor cable is highlighted to the greatest extent, and the roof management is facilitated; and secondly, the net pressing anchor cable is arranged in advance, so that the utilization rate is improved, the effect of reinforcing the roof support by the anchor cable is achieved in the last mining period, the effect of pressing the net anchor rod can be achieved in the last mining period, and the net pressing effect is very obvious.
Add withdrawal and action tie lanes (see fig. 2): the withdrawing connection roadway is used as a withdrawing outlet at the machine head side of the scraper conveyor, and the effect is very obvious; the measure connection roadway has the advantages that before the fully mechanized mining surface enters the final mining preparation period, the measure connection roadway gradually stores the equipment train in an auxiliary withdrawing channel of the next fully mechanized mining surface, convenience is provided for disassembling the monorail overhead line in advance, and the measure connection roadway has a remarkable effect.
2. Optimization of end mining process
The final mining process comprises the steps of arranging an upper net anchor rod (anchor cable) → transporting net → surfing net and networking → collecting net → cutting coal and laying net → pressing net side → cleaning coal gangue, namely, the process of installing an upper net steel wire rope is omitted, and the arranged pressing net anchor rod is optimized into the pressing net side; and moreover, the internet surfing and networking modes are changed, and a special climbing tool is designed and used (see figures 7, 10 and 11).
2.1 setting up an internet anchor rod (anchor cable): when the roof plate is stable, an internet anchor rod can be arranged, and when the roof plate is unstable, an internet anchor cable can be arranged; each hydraulic support is provided with one anchor rod, the position of each hydraulic support is 200 mm away from the beam end of a front beam of each hydraulic support, the anchor rods are positioned at the gap position of the front beams of two adjacent hydraulic supports, a row of net-surfing anchor rods (anchor cables) are arranged along the length direction of the scraper conveyor, each net-surfing anchor rod or anchor cable is arranged, a 40T chain ring is sleeved on each anchor rod or anchor cable, and then an anchor rod cap (lock) is installed to prevent the 40T chain ring from separating from the anchor rods or anchor cables; more than 6 groups of people are generally arranged to work simultaneously.
2.2, transporting the net: and (4) conveying the polyester fiber net to a fully mechanized mining surface to prepare for surfing the net.
Remarking: more than 40 persons work simultaneously, the continuous operation is completed for more than 3 hours, the net rolls conveyed to the fully mechanized mining face are properly elongated, and the long sides are in a tensioned state.
2.3 networking and networking mode: step one, arranging winches on a support, uniformly penetrating each winch steel wire rope from the lower part of a net roll, penetrating the winch steel wire rope from the middle of a 40T chain ring on an internet-surfing anchor rod (anchor rope), and then bundling the winch steel wire rope on a net-fixing steel wire rope; secondly, uniformly and sequentially tightening the winch steel wire ropes, wherein one end of the net roll is driven by the net fixing steel wire rope, and the net fixing steel wire rope is pulled by the winch steel wire rope until the net fixing steel wire rope is tightly attached to a 40T chain ring on the net-surfing anchor rod (anchor cable) and stops; and thirdly, binding the net fixing steel wire rope on a 40T chain ring by using double-stranded No. 8 galvanized iron wires.
2.4, pressing the net edge: after the coal wall of the fully mechanized mining face is dug through, a plurality of groups of workers perform parallel operation in the same direction in a segmented mode, a special ascending ladder is adopted, after the workers ascend, the lock and the anchor cable tray for pressing the net anchor cable are removed, then the net edge penetrates through the anchor cable and is tightly attached to the top plate steel belt, and then the anchor cable tray and the lock are sleeved again, and the net anchor cable is pressed in a pre-tightening mode (see figure 9).
During climbing operation, the hook of the special climbing ladder is hung on a hanging ring below the end of a front beam of the hydraulic support, and an operator can wear a safety belt to climb up the climbing ladder; if the height is not appropriate, the length of the telescopic rod can be adjusted.
3. Optimization and rapid withdrawal of withdrawal operation sequence of fully-mechanized mining face
And opening from the second connecting roadway position of the middle position, withdrawing all the equipment on the fully mechanized mining face, dividing the withdrawing operation into two groups, and carrying out back operation from the middle opening position. A group of people at one side close to the head of the scraper conveyor, the retracted equipment is conveyed out of a retraction connecting roadway, 31315 return air is conveyed outwards along the groove to lift the shaft, and a third connecting roadway is mainly used for disassembling and outwards conveying the coal mining machine in advance. A group of people on the side near the tail of the scraper conveyor, the retracted equipment is transported out of the first communication lane and 31313 return air gateway and is transported out of the shaft.
3.1 the withdrawing sequence is specifically as follows:
3.1.1A group of people near one side of the head of the scraper conveyor: the first step of synchronous operation comprises the steps of disassembling and transporting the coal mining machine outside, disassembling a head (a reversed loader tail) of the scraper conveyer, retracting a chain and a chute of the scraper conveyer, and inserting the chain and the chute of the reversed loader in the retracting glue transportation crossheading; secondly, withdrawing the stack type support and the chute of the scraper conveyor which are arranged in the main withdrawing channel and close to one side of the hydraulic support on the fully mechanized face, and directly driving the frame vehicle into the main withdrawing channel to load the stack type support when conditions allow, so that the withdrawing speed is accelerated, and the smooth path of the hydraulic support in the fully mechanized face is ensured; thirdly, reversely and crossly withdrawing the hydraulic support and the rest row of stacking supports from the second connecting roadway until all the fully mechanized coal mining face equipment on one side of the scraper conveyor head, such as the shielding frame, is withdrawn finally; and fourthly, ending.
3.1.2A set of people near one side of the tail of the scraper conveyor: step one, intensively withdrawing a scraper chain of a scraper conveyer; secondly, withdrawing the stack type support and the chute of the scraper conveyor at one side of the hydraulic support close to the fully mechanized mining surface in the main withdrawal channel to ensure that the path for carrying the hydraulic support in the fully mechanized mining surface is smooth; thirdly, reversely and crossly withdrawing the hydraulic support and the rest row of stack type supports from the second connecting roadway until all the equipment in the fully mechanized mining face at the tail side of the scraper conveyor such as the shield frame and the like are finally withdrawn; and fourthly, ending.
4. Secondary multiplexing of auxiliary fallback channels
In order to prevent the coal from being naturally ignited, after the fully mechanized mining face of the coal mine under the condition of the coal mining is finished, the fully mechanized mining face is sealed within 35 days, namely the fully mechanized mining face is required to be withdrawn within 30 days. The technology of the patent shortens the withdrawal period of the fully mechanized mining face equipment by 21 days, and provides a better place for various solid wastes associated with the daily production of mines, namely, the fully mechanized mining face is intensively filled in a withdrawal channel connection roadway and an auxiliary withdrawal channel before being closed, so that the environment-friendly discharge is achieved, and the solid waste discharge cost is reduced.
The method for designing the withdrawal roadway, fully mechanized mining face end mining and withdrawing has the advantages that:
1. the advantages of the withdrawal roadway design are as follows:
firstly, the tunneling speed of a withdrawal passage is accelerated;
secondly, the tunneling and supporting cost of the auxiliary withdrawing channel is obviously reduced;
thirdly, the width of the coal pillar is adjusted, the number of the connecting roadways is reduced, the stack type support is selected according to an empirical formula, the sinking speed of the top plate of the withdrawing channel is obviously slowed down, the bottom heave amount of the roadway is obviously reduced, a stable, safe and reliable withdrawing operation environment is provided for withdrawing operation of the fully mechanized coal face, and a fundamental technical guarantee is provided for the smoothness of a peripheral auxiliary transportation system and an auxiliary transportation system in the withdrawing channel.
Working resistance (P) of the stack support is actually selectedFruit of Chinese wolfberry) Should be theoretically calculated (P)Theory of things) More than 1.5 times of that of PFruit of Chinese wolfberry≥1.5PTheory of things。
2. The fully mechanized mining face has the advantages of final mining:
firstly, a link of installing an internet wire rope is omitted; the internet surfing and networking links are compressed within 3 hours and can be finished easily; the compression of the net pressing side ring sections can be easily finished within 2 hours, and the net pressing quality is obviously improved.
Secondly, the method comprises the following steps: the time of the operator exposed to the fully-mechanized face coal wall and the empty roof of the hydraulic support front beam is reduced, and the potential safety threat to the operator is reduced.
Thirdly, the method comprises the following steps: the ascending operation frequency of operators in the links of setting an Internet anchor rod, installing an Internet wire rope, surfing, networking and the like is obviously reduced, and the application of the ascending ladder provides convenience for ascending operation and is safer and more reliable.
Fourthly: during surfing the net and networking, the mode of lifting the hydraulic support is no longer used for lifting the net roll, the stability of the operation environment is guaranteed, and the safe operation is facilitated.
Fifth, the method comprises the following steps: the labor consumption of about 344 working cycles before optimization is carried out, the labor consumption after optimization is reduced by 96 working cycles, the labor consumption is reduced by 28.2%, and the labor intensity is obviously reduced.
3. The fully mechanized mining face withdrawing operation has the advantages that:
3.1 before entering the preparation period of final mining, the fully mechanized mining face equipment train is separated out of the rubber transportation gateway through the measure connecting roadway and stored in an auxiliary withdrawing channel of the next fully mechanized mining face, and the amount of monorail crane pipelines influencing the withdrawing of the reversed loader only accounts for 1/3 of the original workload. Therefore, equipment such as the equipment train, the monorail crane pipeline, the reversed loader and the like become peripheral equipment, and the equipment can be arranged at the last withdrawal, so that the withdrawal cycle of the fully mechanized mining face equipment is directly shortened by 2 days.
3.2 the floor heave volume in and around the main withdrawal channel is significantly reduced: because the width of the coal pillar is increased, the number of the connecting roadways is reduced, the working resistance of the stack support is obviously increased, the bottom heave quantity in and around the main withdrawing channel is obviously reduced, powerful conditions are provided for the special vehicle loading vehicle to directly enter the main withdrawing channel to load and transport the stack support and the hydraulic support, and the decisive action is played for accelerating the withdrawing speed.
3.3 a withdrawal connection lane is reserved: firstly, a safety outlet at the side of a glue transportation crossheading is not required to be opened, and parallel operation is directly started from a withdrawal connecting roadway and a third connecting roadway, wherein firstly, a coal mining machine is disassembled and transported outwards, secondly, a head (a reversed loader tail) of a scraper conveyer, a withdrawal scraper conveyer chain and a chute are disassembled, and the withdrawal scraper conveyer chain and the chute can also be inserted in the withdrawal glue transportation crossheading; and secondly, the bottom drum of the bottom plate of the withdrawal channel is effectively controlled by withdrawing the equipment in the fully-mechanized mining face as early as possible, the transportation mode of the stack type support and the hydraulic support in the withdrawal channel is directly changed into special vehicle-mounted transportation by carrying the support by a winch, and the transportation speed of the hydraulic support and the stack type support in the withdrawal channel is greatly improved. Thus, the withdrawal speed is faster, which lays a solid foundation for remarkably reducing the withdrawal period.
3.4 peripheral auxiliary transportation routes and auxiliary transportation routes in the withdrawing channel are smooth, and convenience is provided for quick withdrawing operation. Even if the bottom bulge of the concrete bottom plate is locally influenced, the treatment period is obviously shortened due to the fact that the concrete precast block is prepared in advance, and the treatment effect is very obvious.
4. The secondary multiplexing of the auxiliary fallback channel has the advantages that:
the environment-friendly discharge of the solid waste is realized, and the discharge cost of the solid waste is reduced.
Example 2:
in this embodiment, a fully mechanized mining face of the khaki coal mine 31307 is taken as an example, and the operation is described by adopting a traditional roadway design and retraction mode.
The Hayasu coal mine 31307 fully mechanized mining face: the width of the fully mechanized coal mining face is 290 meters, the average mining height is 5.05 meters, and the face is provided with a scraper conveyor (300 meters), a coal mining machine and a hydraulic support 170; a reversed loader and a belt conveyor are arranged at the side of a glue conveying groove connected with a fully mechanized mining face, and a monorail crane (with the maximum length of 150 meters and the minimum length of 75 meters) and an equipment train (comprising 38 vehicle trays and 200 meters) are arranged in parallel with the belt conveyor; 31309 the fully mechanized mining face has an advancing length of 4150 m.
1. Designing a withdrawal roadway:
as shown in fig. 12, the underground coal mine fully-mechanized mining face is subjected to final mining and withdrawing, a reserved double-channel multi-head withdrawing operation mode is adopted, double withdrawing channels are excavated before coal mining is carried out on the fully-mechanized mining face, the coal pillar spacing between a main withdrawing channel and an auxiliary withdrawing channel is 24.5 meters, 5 connecting tunnels are arranged between the main withdrawing channel and the auxiliary withdrawing channel, and the cross-sectional views are shown in fig. 13 and 14. When the fully mechanized face enters the preparation period of final mining (namely, the distance is 200 meters left from the main withdrawing passage), a stack type bracket is arranged in the main withdrawing passage to strengthen the roof supporting strength.
2. Fully-mechanized mining face final mining:
as shown in fig. 15, when the distance from the main withdrawal passage is only 13.5 meters, the fully mechanized mining face formally enters the cycle, and the procedures are sequentially to beat and set an upper net anchor rod (anchor cable) → installing an upper net steel wire rope → transporting net → surfing and networking → collecting net → cutting coal and laying net → beat and set a net pressing anchor rod → clearing coal gangue.
2.1 setting up an internet anchor rod (anchor cable): when the roof conditions are stable, an internet anchor rod can be arranged, and when the roof is unstable, an internet anchor cable can be arranged; each hydraulic support is arranged one by one, is 200 mm away from the beam end of a front beam of the hydraulic support (see figure 19), is positioned at the gap position of the front beams of two adjacent hydraulic supports, and is provided with a row of net-surfing anchor rods (anchor cables) along the length direction of the scraper conveyor; more than 6 groups of people are generally arranged to work simultaneously.
Remarking: more than 40 persons are usually required to work simultaneously, the continuous operation is completed within 8-12 hours, and the operation period can be threatened by caving and roof gangue falling.
2.2 installing an internet wire rope: the special-shaped trays are arranged on the internet-surfing anchor rods or the anchor cables after the internet-surfing anchor rods or the anchor cables are arranged, namely, one side of each tray is welded with a circular ring, when the internet-surfing steel wire ropes are installed, one end of each internet-surfing steel wire rope is fixed on the top plate anchor cable at a corner by artificial ascending, and then the other end of each internet-surfing anchor rod or anchor cable penetrates through the center of the circular ring of each tray; the other end of the upper wire rope is also fixed on the corner top plate anchor cable after being tensioned.
Remarking: more than 40 persons are usually required to work simultaneously, continuous operation is completed for more than 3 hours, the danger of gangue falling from the rib caving and the top plate can be caused during the operation, and frequent climbing operation is required.
2.3, net transportation: and (4) conveying the polyester fiber net to a fully mechanized mining surface to prepare for surfing the net.
Remarking: more than 40 persons are usually needed to work simultaneously, the continuous operation is completed for more than 3 hours, the net roll conveyed to the fully mechanized mining face is properly elongated, and the long side is in a tensioned state.
2.4 networking and connecting: one end of a polyester fiber net woven with a net fixing steel wire rope is lifted, and the net fixing steel wire rope and an upper net steel wire rope are bound together by using double-stranded No. 8 galvanized iron wires to prepare for net collection (see figure 20); during the hoisting of the net roll, a steel wire rope needs to pass through the lower part of the net roll and then is fixed on an upper net steel wire rope; the net roll hoisting method is that the net roll is hoisted in a mode of lifting a hydraulic support in two groups starting from the middle of the fully mechanized mining face or hoisted and netted by a chain block, one end of the chain block is fixed on a wire rope for surfing the net, and the other end of the chain block is fixed on a wire rope for fixing the net for hoisting; the length and the width of the polyester fiber net roll are respectively more than 250 meters and 14.5 meters, the whole weight is large, more than 30 persons are generally required to work simultaneously, the continuous operation is completed within 12-16 hours, the labor intensity of workers is high, the risk of gangue falling of a rib and a roof is possibly caused during the operation, frequent ascending operation is required, the frequent lifting of the hydraulic support is extremely unfavorable for the management of the roof of the fully mechanized mining face, and potential safety hazards are more.
2.5, collecting the net: after the surfing and networking are finished, the net is gradually rolled up, the networking effect is checked, and coal cutting and net laying preparation is made. The net-collecting effect is shown in figure 17.
Remarking: generally, 15 persons are required to work simultaneously, and the work is finished for 1 hour continuously.
2.6 coal cutting and lapping: after coal cutting and before moving the frame, net rolls in the range of 15 adjacent hydraulic supports are sequentially dropped, after the hydraulic supports are moved, the nets are sequentially collected until the net rolls are communicated with the main withdrawing channel, and the effect after the net rolls are communicated is shown in figure 18.
Remarking: usually, more than 30 persons are required to perform the operation simultaneously, and the operation is completed for more than 32 hours continuously.
2.7, setting a net pressing anchor rod: as shown in fig. 18, after the fully mechanized face is communicated with the main withdrawal passage, the fully mechanized face is stepped on the coal pile, the net pressing anchor rods are arranged, and the other end of the exposed net piece is fixed on the top plate; 6 subgroups are required to operate simultaneously.
Remarking: more than 40 persons are usually required to work simultaneously, the continuous operation is completed within 8-12 hours, and the danger of roof waste rock falling can be caused during the operation.
2.8 cleaning the coal pile: the coal mining machine runs once, most of the piled coal is loaded on the scraper conveyor to be transported away, and the rest of the piled coal is transported away from the scraper conveyor by people, so that the final mining period is finished.
Remarks usually need more than 8 hours, and more than 40 workers have high labor intensity.
3. Withdrawing the fully mechanized mining face equipment:
and opening from the third connecting lane position of the middle position, withdrawing all the equipment on the fully mechanized mining face, dividing the withdrawing operation into two groups, and carrying out back operation from the middle opening position. And the withdrawing equipment is conveyed out of the shaft from the side of the return air crossheading.
The withdrawing sequence is specifically as follows:
3.1 head side team of scraper conveyer: firstly, during the disassembly of a coal mining machine, inserting equipment trains, monorail cranes and pipelines thereof, loaders and crushers in a rubber conveying crossheading for withdrawal, and trying to get through a withdrawal outlet at the side of the rubber conveying crossheading at the highest speed; secondly, withdrawing the stack type support and the chute of the scraper conveyor which are arranged at one side of the main withdrawing channel close to the hydraulic support on the fully mechanized mining face, and ensuring the smooth path of the hydraulic support in the fully mechanized mining face; thirdly, reversely and crossly withdrawing the hydraulic support and the rest row of stacking supports from a third connecting roadway until all the equipment in the fully mechanized mining face at the head side of the scraper conveyor such as the shielding frame and the like are withdrawn finally; and fourthly, ending.
3.2 tail side team of scraper conveyer: step one, intensively withdrawing a scraper chain of a scraper conveyer; secondly, withdrawing the stack type support and the chute of the scraper conveyor at one side of the hydraulic support close to the fully mechanized mining surface in the main withdrawal channel to ensure that the path for carrying the hydraulic support in the fully mechanized mining surface is smooth; thirdly, starting to retreat the hydraulic support and the rest row of stack type supports from a third connecting roadway in a backward type cross way until all the equipment in the fully mechanized mining face at the tail side of the scraper conveyor such as a shield frame and the like are finally withdrawn; and fourthly, ending.
The problems of the withdrawal roadway design, the fully mechanized mining face final mining and the withdrawal method are as follows:
1. the problems existing in the design of a withdrawing roadway are as follows:
firstly, the method comprises the following steps: although a plurality of connecting roadways can provide convenient auxiliary transportation channels, the width of the coal pillars is small, the integrity of the coal pillars is damaged, the supporting function of the coal pillars is obviously reduced, the mine pressure around a withdrawal channel is obviously shown in the last mining period, the dynamic pressure of a mining top plate of a main withdrawal channel and a mining top plate of an auxiliary withdrawal channel on a fully-mechanized mining surface affects obviously a lower bottom drum, and the auxiliary transportation function of a concrete bottom plate is lost; the concrete bottom plates around the withdrawing channel need to be completely excavated, the roadway bottom plate is restored again, the withdrawing period of the fully mechanized mining face equipment is prolonged due to the adverse effect of the peripheral auxiliary transportation system, the major withdrawing channel continues to bottom bulge, so that the withdrawing of the hydraulic support is seriously affected, and the withdrawing period is prolonged more smoothly.
Secondly, the method comprises the following steps: the top and the side of the main and auxiliary withdrawing channels have different cracks and other ore pressure display; and then, the anchor cable support density of each section is forced to be improved during roadway support, and the guniting support is added.
Thirdly, the steps of: although the working resistance reaches 15000MPa, the stack type support for reinforcing the top plate of the main withdrawal passage in the final mining period still cannot meet the requirement; the top plate around the withdrawing channel sinks continuously, so that the roadway bottom is bulged, the channel is not smooth, and the withdrawing speed of the hydraulic support is seriously influenced.
Fourthly: a belt conveyor, a loading machine and a crusher are arranged at the side of the glue conveying smooth groove, and an equipment train, a monorail crane pipeline and the like are arranged in parallel, so that a withdrawal outlet at the side of a machine head of the scraper conveyor is not smooth; and at least 2 days are needed for getting through the head withdrawing outlet of the scraper conveyor to remove all the equipment in the glue transportation crossheading.
2. The problems of the fully mechanized face end mining are as follows:
firstly, the method comprises the following steps: the number of operators is large, except two procedures of collecting the net, cutting the coal and laying the net, the time of the operators exposed to the coal wall of the fully-mechanized coal face and the hollow top range of the front beam of the hydraulic support in the other procedures is long, potential unsafe factors are large, and the safety threat to the operators is large.
Secondly, the method comprises the following steps: before the coal cutting and net laying processes, an upper net anchor rod is arranged, an upper net steel wire rope is installed, net surfing and networking are carried out, the frequency of the operation personnel needing to ascend is very high, a proper ascending tool with high safety is not provided, potential unsafe factors are increased, and the safety of the operation personnel is threatened.
Thirdly, the steps of: during surfing the net and networking, the net roll is lifted by frequently lifting the hydraulic support, so that the management of the top plate of the fully mechanized mining face is extremely unfavorable, potential safety hazards are more, local roof fall accidents are easy to happen, and the personal safety of operating personnel is seriously threatened.
3. The fully mechanized mining face equipment is withdrawn and has problems:
firstly: the outward transport route of the withdrawing equipment at the head side of the scraper conveyor is single, and the withdrawing speed is obviously restricted.
Secondly, the method comprises the following steps: the scraper conveyer aircraft nose side team, the key work in the early stage of withdrawing is forced to be put on the equipment of withdrawal rubber transportation crossheading side, can not earlier withdraw the equipment in the fully mechanized face, and along with the loss of time, the ore pressure that the roof sinks, bottom plate bottom drum etc. shows will be more obvious, has brought the influence of different degrees to the safe withdrawal of the fully mechanized face equipment on next step.
Thirdly, the steps of: the net pressing anchor rod is poor in pre-tightening effect, the anchor rod tray is small in area, and the top leakage phenomenon of the net pressing anchor rod due to the fact that the net edge is separated from the net pressing anchor rod often occurs during withdrawal.
Fourthly: when the withdrawal period of the fully mechanized mining surface is prolonged to more than 30 days, the sealing of the goaf of the fully mechanized mining surface is affected to different degrees, and the fire prevention and extinguishing management of the goaf is not facilitated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for end mining and rapid withdrawal of a fully mechanized mining face of an underground coal mine is characterized by comprising S1. fully mechanized mining face arrangement; s2, final mining protection; s3, quickly withdrawing the fully mechanized coal mining face; wherein
S1, fully mechanized coal mining face arrangement: before the underground coal mine is mined, a fully mechanized coal mining face is excavated, a withdrawing channel of the fully mechanized coal mining face adopts the design of a main withdrawing channel and an auxiliary withdrawing channel, the width of a coal pillar between the main withdrawing channel and the auxiliary withdrawing channel is at least 50 meters, a plurality of connecting roadways are arranged between the main withdrawing channel and the auxiliary withdrawing channel, adjacent connecting roadways are arranged between the adjacent connecting roadways, and the connecting roadways and the glue transportation gateway are arranged, and the distance between each connecting roadway and the return air gateway is at least 65 meters;
a retraction connecting roadway is communicated between the main retraction channel and the main retraction channel of the next fully mechanized mining face, and a measure connecting roadway is communicated between the auxiliary retraction channel and the auxiliary retraction channel of the next fully mechanized mining face;
the anchor cables on the top plate of the main withdrawing channel are arranged asymmetrically, a row of anchor cables are arranged on the central line of the main withdrawing channel, a row of anchor cables are arranged on the top plate of one side, close to the cut-out tunnel, of the main withdrawing channel, two rows of anchor cables are arranged on the top plate of one side, close to the cut-out tunnel, of the main withdrawing channel, and the distance between the row of anchor cables close to the cut-out tunnel and the adjacent coal pillars is 200 mm and 300 mm;
s2, final mining protection: s2.1, setting an internet anchor cable; s2.2, transporting the network; s2.3, surfing the Internet and networking; s2.4, collecting the net; s2.5, cutting coal and paving a net; s2.6, pressing the net edge; wherein
S2.1, setting an internet anchor cable: when the distance between the main withdrawing channel and the fully mechanized face is only 13.5 meters, the fully mechanized face enters into a final mining period, a row of net-surfing anchor rods or anchor cables are arranged at the positions of gaps between two adjacent hydraulic support front beams and 200 millimeters from the beam ends of the hydraulic support front beams along the length direction of the scraper conveyor, chain rings are sleeved on the anchor rods or the anchor cables, and then locks are installed for fixing;
s2.2, net transportation: transporting the net coil to a fully mechanized mining surface to prepare for surfing the net;
s2.3, networking and connecting: step one, arranging winches on a support, uniformly penetrating each winch steel wire rope from the lower part of a net roll, penetrating the winch steel wire rope from the middle of a chain ring on an upper net anchor rod or an anchor rope, and then bundling the winch steel wire rope on a net roll; secondly, uniformly and sequentially tightening winch steel wire ropes, wherein one end of the net roll is driven by a net fixing steel wire rope, and the net fixing steel wire rope is pulled by the winch steel wire rope until the net fixing steel wire rope is tightly attached to a chain ring on the net-surfing anchor rod or the anchor rope and stops; thirdly, binding the net fixing steel wire rope on the chain ring by using a fixing belt;
s2.4, collecting the net: rotating the winch, tightening the winch steel wire rope, and storing the net coil at the lower part of the bracket;
s2.5, coal cutting and lapping: after coal is cut, the winch is rotated before the frame is moved, net rolls within the range of 15 adjacent hydraulic supports are sequentially dropped, and after the hydraulic supports are moved, the nets are sequentially retracted until the net rolls are communicated with the main withdrawing channel;
s2.6, pressing the net edge: after the coal wall of the fully mechanized mining face is drilled through, firstly removing the lock and the anchor cable tray of a row of anchor cables close to the open-off roadway, then penetrating the net edge of the net roll through the anchor cables and clinging to the top plate steel belt, then sleeving the anchor cable tray and the lock again, and pre-tightening and pressing the net anchor cables;
s3 fully mechanized coal mining face rapid withdrawal: opening from the position of the connecting roadway at the middle position, withdrawing all the equipment on the fully mechanized mining face, dividing the withdrawing operation into two groups, carrying out the operation from the position of the middle opening back to the operator, conveying the withdrawn equipment out of the withdrawing connecting roadway by a group of personnel at one side close to the head of the scraper conveyor, and conveying the return air of the next fully mechanized mining face out of the chute to lift the shaft; and a group of personnel on one side close to the tail of the scraper conveyor transport the withdrawn equipment out of the return air crossheading of the fully mechanized mining face and transport the equipment out of the well.
2. The method as claimed in claim 1, wherein the measure roadway is a circular arc roadway, the measure roadway is tangent to the glue transportation gateway, and the measure roadway is located in a space between the tangent point and the mining area glue transportation main roadway.
3. The method for final mining and rapid withdrawing of the fully mechanized coal mining face of the underground coal mine according to claim 1 or 2, wherein the auxiliary withdrawing channel of the next fully mechanized coal mining face comprises an auxiliary straight channel and an auxiliary inclined channel which are communicated, the auxiliary inclined channel is arranged close to one side of an air return gateway of the next fully mechanized coal mining face, and the auxiliary inclined channel is gradually inclined towards a mining area glue transportation main roadway from one end communicated with the auxiliary straight channel to the other end; and one end of the measure connecting roadway, which is communicated with the return air gateway of the next fully mechanized mining face, extends outwards and is tangent and communicated with the auxiliary inclined channel.
4. The method for the final mining and the rapid withdrawal of the fully mechanized coal mining face of the underground coal mine as claimed in claim 1, wherein when the fully mechanized face is 200 m away from the main withdrawal passage, a stack type support is arranged in the main withdrawal passage to enhance the roof support strength.
5. The method for fully mechanized mining face end mining and rapid withdrawal of the underground coal mine according to claim 1, characterized in that in S2.3 networking: when the fixing belt is used for binding the net fixing steel wire rope on the chain ring, the top end of the ascending ladder is hung on the hanging ring of the support by adopting an ascending ladder manually, the lower part of the ascending ladder is close to the net coil and is arranged at the lower part of the support, and the ascending operation is performed manually.
6. The method for end mining and rapid retraction of the fully mechanized coal mining face of the mineworker coal mine according to claim 1, wherein the rapid retraction of the fully mechanized coal mining face of the S3 comprises:
s3.1: a group of personnel close to one side of the head of the scraper conveyor synchronously disassemble an outward transport coal mining machine, disassemble the head of the scraper conveyor, a withdrawal scraper conveyor chain and a chute, and insert the withdrawal rubber transport crossheading in-chute conveyor chain and the chute in a first step; secondly, withdrawing the stack type support and the chute of the scraper conveyor which are arranged in the main withdrawing channel and close to one side of the hydraulic support on the fully mechanized face, and directly driving the frame vehicle into the main withdrawing channel to load the stack type support when conditions allow, so that the withdrawing speed is accelerated, and the smooth path of the hydraulic support in the fully mechanized face is ensured; thirdly, reversely and crossly withdrawing the hydraulic support and the rest row of stacking supports from the middle connecting roadway until all the equipment in the fully mechanized coal mining face on one side of the head of the scraper conveyor is withdrawn finally; step four, ending;
s3.2 a group of personnel close to one side of the tail of the scraper conveyer: step one, intensively withdrawing a scraper chain of a scraper conveyer; secondly, withdrawing the stack type support and the chute of the scraper conveyor at one side of the hydraulic support close to the fully mechanized mining surface in the main withdrawal channel to ensure that the path for carrying the hydraulic support in the fully mechanized mining surface is smooth; thirdly, starting to retreat the hydraulic support and the rest row of stack supports in a backward type cross way from the second connecting roadway until all the equipment in the fully mechanized mining face at the tail side of the scraper conveyor are finally withdrawn; and fourthly, ending.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011239650.3A CN112196616B (en) | 2020-11-09 | 2020-11-09 | End mining and rapid withdrawal method for fully mechanized mining face of underground coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011239650.3A CN112196616B (en) | 2020-11-09 | 2020-11-09 | End mining and rapid withdrawal method for fully mechanized mining face of underground coal mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112196616A CN112196616A (en) | 2021-01-08 |
| CN112196616B true CN112196616B (en) | 2022-07-22 |
Family
ID=74033098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011239650.3A Active CN112196616B (en) | 2020-11-09 | 2020-11-09 | End mining and rapid withdrawal method for fully mechanized mining face of underground coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112196616B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114033458B (en) * | 2021-10-22 | 2023-10-20 | 国家能源集团宁夏煤业有限责任公司 | Fully mechanized mining face retracting method |
| CN114194230B (en) * | 2021-11-30 | 2023-02-10 | 中国煤炭科工集团太原研究院有限公司 | End mining quarter turn method of self-moving equipment train for coal mine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208456613U (en) * | 2018-07-02 | 2019-02-01 | 国电建投内蒙古能源有限公司 | A kind of Mechanized roadway layout structure |
| CN208633835U (en) * | 2018-08-01 | 2019-03-22 | 国电建投内蒙古能源有限公司 | A kind of Mechanized that equipment train is separated with glue fortune crossheading |
| CN110454163B (en) * | 2019-08-30 | 2024-03-26 | 陕煤集团神木红柳林矿业有限公司 | Rapid non-mining withdrawing and coal cleaning process for fully mechanized coal mining face |
-
2020
- 2020-11-09 CN CN202011239650.3A patent/CN112196616B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112196616A (en) | 2021-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2015127808A1 (en) | Center-pillared full-face shaft drilling machine | |
| CN112196616B (en) | End mining and rapid withdrawal method for fully mechanized mining face of underground coal mine | |
| EA037982B1 (en) | Method for pillarless mining with self-preserving development without roadway development at mining area | |
| CN108361034B (en) | A kind of order mining large-mining-height working surface is quickly moved technique | |
| CN109113745B (en) | Method for carrying out large-inclination-angle large-section mountain-down construction cutting by using fully-mechanized excavating machine | |
| CN108979638B (en) | Composite gob-side entry retaining method for wedge-shaped regenerated wall and single-leg shed beam of coal mining roadway | |
| CN110454163B (en) | Rapid non-mining withdrawing and coal cleaning process for fully mechanized coal mining face | |
| CN104373147B (en) | Folding extension type roadway hydraulic bracket | |
| CN108412494B (en) | A kind of long-armed longitudinally oriented strip belt paste body filling process for stoping | |
| CN111561317A (en) | Scraping coal mining method for steeply inclined coal seam | |
| CN103696774A (en) | Development method of blind shaft frame for surface and underground parallel construction | |
| CN110985083B (en) | Stoping roadway stack type support supporting system and method | |
| CN107387139B (en) | Downward dismantling process for large-inclination-angle retracting working surface support | |
| RU2141030C1 (en) | Device for construction of mine shafts | |
| CN105937400B (en) | It is a kind of once to tunnel Liu Sheshuan lanes digging operation production line | |
| CN111042816A (en) | Mine section hole-cutting roadway-forming tunneling method | |
| CN105937401B (en) | The method for protecting support in Liu Sheshuan lanes is once tunneled in a kind of U-shaped ventilation | |
| CN111828003B (en) | Rapid intelligent mining method for irregular working face of coal mine | |
| CN113356850A (en) | Method and system for pre-digging and withdrawing channel of fully mechanized mining face with large mining height | |
| CN207348899U (en) | A kind of fully-mechanized mining working withdraws system | |
| CN217976301U (en) | Withdrawing structure | |
| Pacher et al. | Semmering Base Tunnel Contract SBT2. 1 Tunnel Fröschnitzgraben–Creative solutions for complex shafts/Semmering‐Basistunnel Baulos SBT2. 1 Tunnel Fröschnitzgraben–Kreative Lösungen für komplexe Schachtbauwerke | |
| CN113339012B (en) | Construction method of ultra-wide section tunnel | |
| CN220395704U (en) | Totally-enclosed intelligent tunneling machine for coal mine | |
| CN109488304B (en) | Conveying method of large drilling grouting equipment |
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 |