CN107542467B - Method for mining old roadway through inclined long wall under complex condition - Google Patents
Method for mining old roadway through inclined long wall under complex condition Download PDFInfo
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- CN107542467B CN107542467B CN201710750896.9A CN201710750896A CN107542467B CN 107542467 B CN107542467 B CN 107542467B CN 201710750896 A CN201710750896 A CN 201710750896A CN 107542467 B CN107542467 B CN 107542467B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000002265 prevention Effects 0.000 claims abstract description 10
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- 230000001965 increasing effect Effects 0.000 claims description 4
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Abstract
The invention relates to a method for mining old roadways by using normally closed inclined under complex conditions, which is characterized by comprising the following steps: (1) a step of early preparation work; (2) later construction steps; the invention has the advantages that: the method is characterized in that statistical analysis is carried out on the old roadway position, the airtight condition, the slurry condition and the old material condition in the old roadway during the extraction period of the inclined long-wall old roadway under the complex condition, and potential safety hazards in aspects of position adjustment, the old roadway technical scheme, fire prevention and extinguishing measures, electromechanical equipment state control, transportation management promotion, water prevention and drainage and the like in the extraction process of the working face are examined in detail, so that effective safety technical measures are formulated in a targeted manner, and the purpose of safe and efficient extraction of the working face is achieved. The failure rate of the equipment is reduced, and enterprise benefits are provided.
Description
Technical Field
The invention relates to a method for mining old roadways by inclined longwalls under complex conditions.
Background
In 2013, in order to relieve the situation of mine resource shortage, the beam home coal mine protection coal pillar is provided with the last working face of the mining area, the working face is a face-climbing inclined long-wall large-inclination face downward mining working face of the mining area, the inclination reaches 16 degrees, the fault geological structure in the working face is complex, multiple old lanes such as face material connecting lanes and face transportation lanes need to be mined back in the mining process, in the mining process of the working face, factors such as gas overrun in old air, grouting and gushing, water burst, old associated lanes and lane states are increased by the aid of the bedding degree to promote transportation, adverse factors are more, damage to equipment of the working face is large, the working face is restrained from being rapidly pushed, and great influence is caused on normal pushing of the working face. The conventional working face of the beam family coal mine adopts a strike longwall retreating type coal mining method, and a mine has no referential experience of inclined longwall passing through an old roadway under the complex condition.
Disclosure of Invention
Through research, optimization and execution, the advancing speed of the working face is accelerated, the recovery efficiency and resource recovery of the working face are improved, and technical and experience reference is provided for the recovery of the uphill inclined longwall old drift of the mining area under similar conditions.
In order to overcome the defects of the prior art, the invention provides a method for extracting the old roadway by inclined longwall under complex conditions. The technical scheme of the invention is as follows:
a method for mining old roadways by inclined longwalls under complex conditions comprises the following steps:
(1) a step of early preparation work;
(2) later construction steps;
the step (1) specifically comprises the following steps:
(1-1) before the working face passes through the old lane, increasing an included angle between the advancing direction of the working face and the old lane, ensuring that the working face can lead the head and the tail to slide by 5-10 m as far as possible under the condition of ensuring the recovery, reducing the exposed area of the old lane on the working face and avoiding the condition that a large amount of gangue caving from the top plate caving of the old lane is concentrated and falls; the transportation lane is bedded in advance, so that reasonable overlapping and head sliding unloading height of equipment before and during the process that the working face passes through the old lane after the layer position is adjusted are ensured; the maintenance and reinforcement work of the two ends of the old roadway is enhanced, and the phenomenon that the pressure of the closed wall is damaged due to dynamic pressure, so that the high-temperature and spontaneous combustion conditions occur after air enters the old roadway, and the safety production of a working surface is influenced is prevented; 4 sets of air supply joints are arranged at the two ends and the middle position of a working face, and phi 19 high-pressure pipes 50m are reserved, so that when the gas in the old lane is abnormal, the gas accumulated in the old lane can be quickly discharged by using an on-site compressed air pipeline; 3 sets of water supply joints are arranged at two ends and the middle part of the working face, two special dust spraying pipelines with the length of not less than 20m are reserved, and water is sprayed to wet coal bodies in old lanes, among racks and behind the racks of the working face, so that the problems of high temperature, spontaneous combustion and fire prevention are prevented; various materials are reserved in two lanes and a working face area, so that various conditions appearing during the working face passing the old lane are convenient to process, and the working face is ensured to be normally propelled: a material returning jack is arranged below a front beam of the head sliding support so as to facilitate timely withdrawing of materials in an old roadway and guarantee normal propulsion of a working face; the material return jack moves upwards in time along with the exposure range of the old lane on the working face; the overhaul of the equipment is enhanced, the hidden danger of the equipment is eliminated, and the good state is ensured; the upright column and the jack of the working face bracket have no leakage, each connecting pin shaft is complete and intact, and the bracket support is powerful; scraper chains of the scraper conveyor and the reversed loader are intact, and the performance of driving equipment is good; the belt is intact without obvious damage, the driving device has good performance, the belt buckle is firm and reliable, and the triple roller and the straight roller are complete and intact; the cutting teeth of the drum of the coal mining machine are complete and firm, the connecting points of the machine body are fastened in place, the driving and traction devices have reliable performance, and the oil level is normal.
The concrete construction method in the step (2) comprises the following steps:
(2-1) when the working face head sliding propulsion is 10-15 m away from the inner wall of the transport lane old lane, arranging personnel to retract the pipeline and the road wood before the upper wall side old lane is sealed, ensuring normal propulsion of the working face during mining the old lane, performing bottom lying adjustment on the working face before the working face is mined the old lane according to the relation of the working face and the old lane, ensuring that the working face top plate is mined along the old lane bottom plate when the working face is mined the old lane, reducing the influence of slurry and materials in the old lane on normal mining of the working face, and ensuring normal propulsion of the working face; when the working face slide head is pushed to the position 10m away from the old lane, 3 sounding holes are drilled from the end position by using a long drill rod which is not less than 5m, the drilling holes are drilled at intervals of 5m from 5m away from the slide head in sequence, the gas in the old lane is detected, the working face slide head is pushed forwards in a mode of detecting 5m and collecting 3m, when the working face slide head is 5m away from the old lane, the old lane is penetrated, the gas condition in the old lane is checked, measures are taken in time to process when abnormality is found, and the old lane can be recovered and exposed only under the condition that the gas in the old lane is normal;
(2-2) in the pushing process of the rest 1.6m of the old roadway exposed from the chute head, the chute head bracket area and the lower forward loader area are completely hidden in the safe area of the working surface by people except a chute, a crusher and a driver, so that slurry is prevented from being leaked out;
(2-3) after the old lane is exposed on the front face of the working face, the speed of the coal mining machine must be reduced, the fall between the old lane and a bottom plate of the transportation lane at the head sliding section is smaller, and sundries of a material stone wall, a U-shaped shed and a grouting pipeline in the old lane must be processed in time, so that an iron cutter and material stone sundries of the coal mining machine are prevented, and equipment is protected; reinforcing the top plate management of the old lane area, ensuring that the support initial supporting force reaches more than 24MPa, disclosing the old lane area, drawing a forepoling, extending out a protection wall to maintain the old lane top plate, if the support front beam and the top beam are not connected in real time, backing the support front beam and the top beam with a road wood, and ensuring that the connection is compact; when a top plate in front of a support breaks a hollow top, a plate beam or pi steel is inserted into a top beam of the support, and the hollow top plate is maintained in advance; according to the relation between the working face and the old lane, the stoping position of the working face is adjusted in time in the stoping process, the stoping of a working face top plate along the old lane bottom plate is guaranteed, and the influence of old lane mud and materials on the propulsion of the working face is reduced; the inspection and monitoring work of the gas in the old roadway is enhanced, normal drilling detection is required according to measures, the position of the old roadway and the gas monitoring equipment of the coal mining machine are normally used, the old roadway gas is inspected by general defense department personnel each shift, and meanwhile, the old roadway is sprayed with water and ventilated in time in the stoping process, so that the temperature of a coal body is reduced, the concentration of the gas is diluted, abnormal conditions exist, the coal ash is poured into the old roadway and a stopping agent is added in time, and the safety of a working face during the stoping of the old roadway is ensured; personnel are arranged in time to pick and process the anchor rods, the anchor beams and the pipeline materials in the old lane, so that the equipment damage is reduced, and the normal operation of the system is ensured; according to the situations of old lane grouting and fly ash, after the old lane is exposed on the front side of a working face, the mud inflow amount is mainly monitored and controlled in the stoping process, the mud inflow position needs to be slowed down, and the mud is prevented from overflowing a chute;
(2-4) during the working face stoping process of the old roadway, the mining height of the working face is guaranteed to be more than 3.0m, when the working face bottom bulges due to the pressure of a top plate, manual bottom lying is arranged in time, and the phenomenon that the roof of a coal cutter is difficult to cut due to the fact that a chute is turned over by the drum is prevented; arranging a specially-assigned person to carry out the inspection operation of the belt system, enhancing the use and maintenance of a coal scraper, a coal baffle and a gangue separating device of the belt system, and ensuring the normal operation of the belt system; when the bottom plate of the working surface is slimed and softened and the chute on the working surface is pricked to cause the chute to be turned over, the chute is laid and hung on the bottom plate before each class of frame, so that the chute is ensured to be flat and the height of the chute passing machine is ensured; during the mining of the old roadway, particularly during the mining of the old roadway, the material stone wall, the material stone bottom arch and the belt head perfusion foundation are exposed, the inspection, the overhaul and the maintenance of equipment on a working face are enhanced, the overhaul of the equipment and the maintenance of the good state of the working face are ensured, and the rapid propulsion and the continuous propulsion of the working face are ensured; the operation is strictly carried out according to the requirements, the gas management and fire prevention and extinguishing work of the old lane passing through the working face are well done, and the safe propulsion of the working face is ensured; for the old lane with the missed roof and the roof fall, firstly adopting a method of fixing anchor rods at the missed roof area and around the missed roof area in the stoping process to stabilize the roof plate of the missed roof area and prevent further missed roof accidents; secondly, the forepoling is pulled to protect the top in time, the front top plate is supported by a support front beam in a protecting mode, disturbance of a coal cutter to the top plate in a missed area is reduced to the greatest extent in the coal cutting process, generally, a method that the coal cutter only cuts a bed knife is adopted, the forepoling is pushed, slid and pulled in time after a bottom plate is cleaned, and therefore the top plate in front of a coal wall of a working face is controlled, and the possibility that the top plate falls further is reduced; reinforcing support management of two roadways, timely replacing extruded side columns, lost foot columns and discharged liquid in the two roadways, and performing column changing treatment, so that the support strength of the roadways is ensured, the shrinkage deformation of the roadways is reduced, and the normal propulsion of a working face is ensured; if the slurry output amount in the old lane is large, maintaining personnel on posts along the conveying line, cleaning slurry along the belt and at the belt transfer point, adjusting the running state of the belt and ensuring the normal propulsion of a working face; in the working face inclination adjusting and stoping process, the working face chute flees downwards at any time by adjusting the pushing sequence of the chute and matching with the adjustment mode of the working face antiskid device, so that the chute is reasonably lapped with a reversed loader;
and (2-5) after the working face pushes the old roadway top plate to be stable, gradually lifting the bottom along 4-7 layers for stoping, and adjusting to the requirement of normal mining and releasing circulation.
The method for maintaining and reinforcing the two closed ends of the old roadway in the step (1-1) comprises the following steps:
(1-1-1) removing U-shaped shed legs at the closed position of the old roadway according to the field condition, binding three four-inch pipelines at the position of the old roadway in the forward direction, and compacting the underground opening by using channel timbers; retaining a U-shaped shed support at the old roadway, and compacting the underground opening at the back of the U-shaped shed legs by using pipelines and road timbers, so that the old roadway is completely sealed in the stoping process, and sealed fracture and grout leakage are prevented;
(1-1-2) strengthening the reinforcement work before and after the sealing of the old roadway, and adopting an encrypted support for the roadway within the range of 5m before and after the sealing of the old roadway, so that the support strength of the roadway is improved, and the damage of dynamic pressure of the roadway to the sealing of the old roadway is reduced;
(1-1-3) the wood piles hit by the coal wall sides of the old roadway area are reinforced and fixed in advance, so that the wood piles are prevented from scattering when the working face is pushed to the position, the top beam of the working face support can pick up the false roof of the wood pile construction, and the top falling accident in the end area is prevented.
Various materials are reserved in the two lanes and the working face area in the step (1-1)
The method comprises the following steps:
(1-1-4) before the working face is mined out of the old lane, a certain amount of road wood, pi steel and single prop supporting materials are reserved at the advanced supporting head of the material lane, back-to-top supporting can be timely carried out when the working face top plate is broken and falls off, the single prop is used for assisting in pulling and moving the support, the top plate disturbance is reduced, and the working face top plate is ensured to be stable;
(1-1-5) reserving 1-2 air coal drills and lengthened drill rods on a working face sliding head, and carrying out advanced detection on the gas in the old roadway to ensure the safety of stoping;
(1-1-6) a plurality of circular ring chains and plate ring hoisting tools are reserved at the working face support, and when the chute on the working face inclines forwards, the chute can be hoisted and pushed in time, so that the state deterioration is prevented, and the normal propulsion is ensured;
(1-1-7) reserving 1-2 anchor rod cutters and air pipes on the working face, and when an old roadway is exposed on the front face of the working face, timely cutting off the anchor rod on the side of the old roadway, reducing equipment damage and ensuring normal operation;
(1-1-8) 5-6 long-handle rakes are reserved on the working face, the slurry output amount in an old roadway is large, and when a coal mining machine cannot cut normally, slurry can be timely cleaned into a chute, so that the working face is guaranteed to be normally pushed;
(1-1-9) spare wire clippers, hammers and pneumatic pick tools are arranged at the tail end of the sliding chute and are used for breaking spraying bodies, belt foundations and pouring bodies in the old roadway, reducing equipment damage and ensuring normal operation of the equipment;
(1-1-10) installing a coal sweeper and a coal baffle plate on each belt pressing device and each belt head of the conveying lane to ensure that slurry on the belt can be cleaned in time, and reserving sawdust and sand materials to ensure normal operation of the belt;
(1-1-11) a set of waste rock separating device is additionally arranged behind the large frame of the belt head of the transportation lane, so that the mud and the spraying impurities in the old and the rural areas can be timely separated and transported, and the system can be ensured to be normal.
After the old roadway is exposed on the front face of the working face, the mud inflow amount is monitored and controlled in an important mode in the stoping process, and the steps (2-4) are as follows:
(2-4-1) exposing an old roadway on the front side of a working face, slowing down the traction speed of a coal mining machine when slurry is gushed out, repeatedly returning the machine in sections, mixing the machine with coal, simultaneously opening a rear scraper conveyer to discharge the coal, mixing the slurry pulled by a front scraper conveyer again, reducing the viscosity of the slurry and preventing bin blockage;
(2-4-2) when a large amount of mud gushes out from the old lane exposed on the working face, timely informing a driver at a post of a peripheral transportation system of paying attention to the amount of the drawn mud, and when a large amount of mud enters the peripheral system, immediately stopping the equipment from running at a post along the line, and carrying the mud out in a segmented mode in a inching mode to prevent the mud from blocking the transportation system along the line and influencing the normal propulsion of the working face;
(2-4-3) the flowing slurry disclosed by the coal wall of the working face needs to be treated by utilizing the downtime of an overhaul class or a production class and adopting manual bagging, so that the influence of the slurry on the system is reduced.
The construction method for the transport lane region passing through the old lane in the step (2-5) comprises the following steps:
(2-5-1) before and during the working face mining of the old roadway, removing a roadway support center pillar and a lower side pillar in front of an end frame, retaining support pi steel and a road wood above the end frame, and retaining the support mode of the lower side pillar, so that the support strength of the end area, particularly the roadway at the closed position of the old roadway at the lower side of the transportation roadway is ensured, and the normal propulsion of the working face is prevented from being influenced by the fact that the old roadway is pressed, broken and slurry is discharged; the reserved single prop at the lower side is withdrawn behind the end frame, and if a top plate at the rear of the end frame falls off and the operation space cannot meet the requirement of safe operation, the support single prop is not withdrawn;
(2-5-2) after the old lane is exposed on the front surface of the working surface, arranging personnel at each transfer point of the sliding head and the belt to carry out the cleaning work of the anchor rods and the spraying body sundries, reducing the influence of the sundries on the operation of the system and ensuring the normal propulsion of the working surface.
The invention has the advantages that: the method is characterized in that statistical analysis is carried out on the old roadway position, the airtight condition, the slurry condition and the old material condition in the old roadway during the extraction period of the inclined long-wall old roadway under the complex condition, and potential safety hazards in aspects of position adjustment, the old roadway technical scheme, fire prevention and extinguishing measures, electromechanical equipment state control, transportation management promotion, water prevention and drainage and the like in the extraction process of the working face are examined in detail, so that effective safety technical measures are formulated in a targeted manner, and the purpose of safe and efficient extraction of the working face is achieved. The failure rate of the equipment is reduced, and enterprise benefits are provided.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
The invention relates to a method for mining an old roadway by inclined longwall under complex conditions, which comprises the following steps:
(1) a step of early preparation work;
(2) later construction steps;
the step (1) specifically comprises the following steps:
(1-1) before the working face passes through the old lane, increasing an included angle between the advancing direction of the working face and the old lane, ensuring that the working face can lead the head and the tail to slide by 5-10 m as far as possible under the condition of ensuring the recovery, reducing the exposed area of the old lane on the working face and avoiding the condition that a large amount of gangue caving from the top plate caving of the old lane is concentrated and falls; the transportation lane is bedded in advance, so that reasonable overlapping and head sliding unloading height of equipment before and during the process that the working face passes through the old lane after the layer position is adjusted are ensured; the maintenance and reinforcement work of the two ends of the old roadway is enhanced, and the phenomenon that the pressure of the closed wall is damaged due to dynamic pressure, so that the high-temperature and spontaneous combustion conditions occur after air enters the old roadway, and the safety production of a working surface is influenced is prevented; 4 sets of air supply joints are arranged at the two ends and the middle position of a working face, and phi 19 high-pressure pipes 50m are reserved, so that when the gas in the old lane is abnormal, the gas accumulated in the old lane can be quickly discharged by using an on-site compressed air pipeline; 3 sets of water supply joints are arranged at two ends and the middle part of the working face, two special dust spraying pipelines with the length of not less than 20m are reserved, and water is sprayed to wet coal bodies in old lanes, among racks and behind the racks of the working face, so that the problems of high temperature, spontaneous combustion and fire prevention are prevented; various materials are reserved in two lanes and a working face area, so that various conditions appearing during the working face passing the old lane are convenient to process, and the working face is ensured to be normally propelled: a material returning jack is arranged below a front beam of the head sliding support so as to facilitate timely withdrawing of materials in an old roadway and guarantee normal propulsion of a working face; the material return jack moves upwards in time along with the exposure range of the old lane on the working face; the overhaul of the equipment is enhanced, the hidden danger of the equipment is eliminated, and the good state is ensured; the upright column and the jack of the working face bracket have no leakage, each connecting pin shaft is complete and intact, and the bracket support is powerful; scraper chains of the scraper conveyor and the reversed loader are intact, and the performance of driving equipment is good; the belt is intact without obvious damage, the driving device has good performance, the belt buckle is firm and reliable, and the triple roller and the straight roller are complete and intact; the cutting teeth of the drum of the coal mining machine are complete and firm, the connecting points of the machine body are fastened in place, the driving and traction devices have reliable performance, and the oil level is normal.
The concrete construction method in the step (2) comprises the following steps:
(2-1) when the working face head sliding propulsion is 10-15 m away from the inner wall of the transport lane old lane, arranging personnel to retract the pipeline and the road wood before the upper wall side old lane is sealed, ensuring normal propulsion of the working face during mining the old lane, performing bottom lying adjustment on the working face before the working face is mined the old lane according to the relation of the working face and the old lane, ensuring that the working face top plate is mined along the old lane bottom plate when the working face is mined the old lane, reducing the influence of slurry and materials in the old lane on normal mining of the working face, and ensuring normal propulsion of the working face; when the working face slide head is pushed to the position 10m away from the old lane, 3 sounding holes are drilled from the end position by using a long drill rod which is not less than 5m, the drilling holes are drilled at intervals of 5m from 5m away from the slide head in sequence, the gas in the old lane is detected, the working face slide head is pushed forwards in a mode of detecting 5m and collecting 3m, when the working face slide head is 5m away from the old lane, the old lane is penetrated, the gas condition in the old lane is checked, measures are taken in time to process when abnormality is found, and the old lane can be recovered and exposed only under the condition that the gas in the old lane is normal;
(2-2) in the pushing process of the rest 1.6m of the old roadway exposed from the chute head, the chute head bracket area and the lower forward loader area are completely hidden in the safe area of the working surface by people except a chute, a crusher and a driver, so that slurry is prevented from being leaked out;
(2-3) after the old lane is exposed on the front face of the working face, the speed of the coal mining machine must be reduced, the fall between the old lane and a bottom plate of the transportation lane at the head sliding section is smaller, and sundries of a material stone wall, a U-shaped shed and a grouting pipeline in the old lane must be processed in time, so that an iron cutter and material stone sundries of the coal mining machine are prevented, and equipment is protected; reinforcing the top plate management of the old lane area, ensuring that the support initial supporting force reaches more than 24MPa, disclosing the old lane area, drawing a forepoling, extending out a protection wall to maintain the old lane top plate, if the support front beam and the top beam are not connected in real time, backing the support front beam and the top beam with a road wood, and ensuring that the connection is compact; when a top plate in front of a support breaks a hollow top, a plate beam or pi steel is inserted into a top beam of the support, and the hollow top plate is maintained in advance; according to the relation between the working face and the old lane, the stoping position of the working face is adjusted in time in the stoping process, the stoping of a working face top plate along the old lane bottom plate is guaranteed, and the influence of old lane mud and materials on the propulsion of the working face is reduced; the inspection and monitoring work of the gas in the old roadway is enhanced, normal drilling detection is required according to measures, the position of the old roadway and the gas monitoring equipment of the coal mining machine are normally used, the old roadway gas is inspected by general defense department personnel each shift, and meanwhile, the old roadway is sprayed with water and ventilated in time in the stoping process, so that the temperature of a coal body is reduced, the concentration of the gas is diluted, abnormal conditions exist, the coal ash is poured into the old roadway and a stopping agent is added in time, and the safety of a working face during the stoping of the old roadway is ensured; personnel are arranged in time to pick and process the anchor rods, the anchor beams and the pipeline materials in the old lane, so that the equipment damage is reduced, and the normal operation of the system is ensured; according to the situations of old lane grouting and fly ash, after the old lane is exposed on the front side of a working face, the mud inflow amount is mainly monitored and controlled in the stoping process, the mud inflow position needs to be slowed down, and the mud is prevented from overflowing a chute;
(2-4) during the working face stoping process of the old roadway, the mining height of the working face is guaranteed to be more than 3.0m, when the working face bottom bulges due to the pressure of a top plate, manual bottom lying is arranged in time, and the phenomenon that the roof of a coal cutter is difficult to cut due to the fact that a chute is turned over by the drum is prevented; arranging a specially-assigned person to carry out the inspection operation of the belt system, enhancing the use and maintenance of a coal scraper, a coal baffle and a gangue separating device of the belt system, and ensuring the normal operation of the belt system; when the bottom plate of the working surface is slimed and softened and the chute on the working surface is pricked to cause the chute to be turned over, the chute is laid and hung on the bottom plate before each class of frame, so that the chute is ensured to be flat and the height of the chute passing machine is ensured; during the mining of the old roadway, particularly during the mining of the old roadway, the material stone wall, the material stone bottom arch and the belt head perfusion foundation are exposed, the inspection, the overhaul and the maintenance of equipment on a working face are enhanced, the overhaul of the equipment and the maintenance of the good state of the working face are ensured, and the rapid propulsion and the continuous propulsion of the working face are ensured; the operation is strictly carried out according to the requirements, the gas management and fire prevention and extinguishing work of the old lane passing through the working face are well done, and the safe propulsion of the working face is ensured; for the old lane with the missed roof and the roof fall, firstly adopting a method of fixing anchor rods at the missed roof area and around the missed roof area in the stoping process to stabilize the roof plate of the missed roof area and prevent further missed roof accidents; secondly, the forepoling is pulled to protect the top in time, the front top plate is supported by a support front beam in a protecting mode, disturbance of a coal cutter to the top plate in a missed area is reduced to the greatest extent in the coal cutting process, generally, a method that the coal cutter only cuts a bed knife is adopted, the forepoling is pushed, slid and pulled in time after a bottom plate is cleaned, and therefore the top plate in front of a coal wall of a working face is controlled, and the possibility that the top plate falls further is reduced; reinforcing support management of two roadways, timely replacing extruded side columns, lost foot columns and discharged liquid in the two roadways, and performing column changing treatment, so that the support strength of the roadways is ensured, the shrinkage deformation of the roadways is reduced, and the normal propulsion of a working face is ensured; if the slurry output amount in the old lane is large, maintaining personnel on posts along the conveying line, cleaning slurry along the belt and at the belt transfer point, adjusting the running state of the belt and ensuring the normal propulsion of a working face; in the working face inclination adjusting and stoping process, the working face chute flees downwards at any time by adjusting the pushing sequence of the chute and matching with the adjustment mode of the working face antiskid device, so that the chute is reasonably lapped with a reversed loader;
and (2-5) after the working face pushes the old roadway top plate to be stable, gradually lifting the bottom along 4-7 layers for stoping, and adjusting to the requirement of normal mining and releasing circulation.
The method for maintaining and reinforcing the two closed ends of the old roadway in the step (1-1) comprises the following steps:
(1-1-1) removing U-shaped shed legs at the closed position of the old roadway according to the field condition, binding three four-inch pipelines at the position of the old roadway in the forward direction, and compacting the underground opening by using channel timbers; retaining a U-shaped shed support at the old roadway, and compacting the underground opening at the back of the U-shaped shed legs by using pipelines and road timbers, so that the old roadway is completely sealed in the stoping process, and sealed fracture and grout leakage are prevented;
(1-1-2) strengthening the reinforcement work before and after the sealing of the old roadway, and adopting an encrypted support for the roadway within the range of 5m before and after the sealing of the old roadway, so that the support strength of the roadway is improved, and the damage of dynamic pressure of the roadway to the sealing of the old roadway is reduced;
(1-1-3) reinforcing and fixing the wood piles hit by the coal wall sides of the old roadway area in advance to ensure that the wood piles are not scattered when the working face is pushed to the position, and the top beam of the working face support can pick up the false roof of the wood pile construction to prevent the roof falling accident in the end area;
various materials are reserved in the two lanes and the working face area in the step (1-1)
The method comprises the following steps:
(1-1-4) before the working face is mined out of the old lane, a certain amount of road wood, pi steel and single prop supporting materials are reserved at the advanced supporting head of the material lane, back-to-top supporting can be timely carried out when the working face top plate is broken and falls off, the single prop is used for assisting in pulling and moving the support, the top plate disturbance is reduced, and the working face top plate is ensured to be stable;
(1-1-5) reserving 1-2 air coal drills and lengthened drill rods on a working face sliding head, and carrying out advanced detection on the gas in the old roadway to ensure the safety of stoping;
(1-1-6) a plurality of circular ring chains and plate ring hoisting tools are reserved at the working face support, and when the chute on the working face inclines forwards, the chute can be hoisted and pushed in time, so that the state deterioration is prevented, and the normal propulsion is ensured;
(1-1-7) reserving 1-2 anchor rod cutters and air pipes on the working face, and when an old roadway is exposed on the front face of the working face, timely cutting off the anchor rod on the side of the old roadway, reducing equipment damage and ensuring normal operation;
(1-1-8) 5-6 long-handle rakes are reserved on the working face, the slurry output amount in an old roadway is large, and when a coal mining machine cannot cut normally, slurry can be timely cleaned into a chute, so that the working face is guaranteed to be normally pushed;
(1-1-9) spare wire clippers, hammers and pneumatic pick tools are arranged at the tail end of the sliding chute and are used for breaking spraying bodies, belt foundations and pouring bodies in the old roadway, reducing equipment damage and ensuring normal operation of the equipment;
(1-1-10) installing a coal sweeper and a coal baffle plate on each belt pressing device and each belt head of the conveying lane to ensure that slurry on the belt can be cleaned in time, and reserving sawdust and sand materials to ensure normal operation of the belt;
(1-1-11) a set of waste rock separating device is additionally arranged behind the large frame of the belt head of the transportation lane, so that the mud and the spraying impurities in the old and the rural areas can be timely separated and transported, and the system can be ensured to be normal.
After the old roadway is exposed on the front face of the working face, the mud inflow amount is monitored and controlled in an important mode in the stoping process, and the steps (2-4) are as follows:
(2-4-1) exposing an old roadway on the front side of a working face, slowing down the traction speed of a coal mining machine when slurry is gushed out, repeatedly returning the machine in sections, mixing the machine with coal, simultaneously opening a rear scraper conveyer to discharge the coal, mixing the slurry pulled by a front scraper conveyer again, reducing the viscosity of the slurry and preventing bin blockage;
(2-4-2) when a large amount of mud gushes out from the old lane exposed on the working face, timely informing a driver at a post of a peripheral transportation system of paying attention to the amount of the drawn mud, and when a large amount of mud enters the peripheral system, immediately stopping the equipment from running at a post along the line, and carrying the mud out in a segmented mode in a inching mode to prevent the mud from blocking the transportation system along the line and influencing the normal propulsion of the working face;
(2-4-3) the flowing slurry disclosed by the coal wall of the working face needs to be treated by utilizing the downtime of an overhaul class or a production class and adopting manual bagging, so that the influence of the slurry on the system is reduced.
The construction method for the transport lane region passing through the old lane in the step (2-5) comprises the following steps:
(2-5-1) before and during the working face mining of the old roadway, removing a roadway support center pillar and a lower side pillar in front of an end frame, retaining support pi steel and a road wood above the end frame, and retaining the support mode of the lower side pillar, so that the support strength of the end area, particularly the roadway at the closed position of the old roadway at the lower side of the transportation roadway is ensured, and the normal propulsion of the working face is prevented from being influenced by the fact that the old roadway is pressed, broken and slurry is discharged; the reserved single prop at the lower side is withdrawn behind the end frame, and if a top plate at the rear of the end frame falls off and the operation space cannot meet the requirement of safe operation, the support single prop is not withdrawn;
(2-5-2) after the old lane is exposed on the front surface of the working surface, arranging personnel at each transfer point of the sliding head and the belt to carry out the cleaning work of the anchor rods and the spraying body sundries, reducing the influence of the sundries on the operation of the system and ensuring the normal propulsion of the working surface.
Claims (1)
1. A method for mining old roadways by inclined longwalls under complex conditions is characterized by comprising the following steps:
(1) a step of early preparation work;
(2) later construction steps;
the step (1) specifically comprises the following steps:
(1-1) before the working face passes through the old lane, increasing an included angle between the advancing direction of the working face and the old lane, ensuring that the working face ensures that a sliding head leads a sliding tail by 5-10 m under the condition of ensuring the recovery, reducing the exposed area of the old lane on the working face and avoiding the condition that a large amount of gangue collapsed by a top plate ledge of the old lane falls concentratedly; the transportation lane is bedded in advance, so that reasonable overlapping and head sliding unloading height of equipment before and during the process that the working face passes through the old lane after the layer position is adjusted are ensured; the maintenance and reinforcement work of the two ends of the old roadway is enhanced, and the phenomenon that the pressure of the closed wall is damaged due to dynamic pressure, so that the high-temperature and spontaneous combustion conditions occur after air enters the old roadway, and the safety production of a working surface is influenced is prevented; 4 sets of air supply joints are arranged at two ends and the middle part of the working face, and a standby high-pressure pipe is 50m, so that when the gas in the old lane is abnormal, the gas accumulated in the old lane can be quickly discharged by using a field compressed air pipeline; 3 sets of water supply joints are arranged at two ends and the middle part of the working face, two special dust spraying pipelines with the length of not less than 20m are reserved, and water is sprayed to wet coal bodies in old lanes, among racks and behind the racks of the working face, so that the problems of high temperature, spontaneous combustion and fire prevention are prevented; various materials are reserved in two lanes and a working face area, so that various conditions appearing during the working face passing the old lane are convenient to process, and the working face is ensured to be normally propelled: a material returning jack is arranged below a front beam of the head sliding support so as to facilitate timely withdrawing of materials in an old roadway and guarantee normal propulsion of a working face; the material return jack moves upwards in time along with the exposure range of the old lane on the working face; the overhaul of the equipment is enhanced, the hidden danger of the equipment is eliminated, and the good state is ensured; the upright column and the jack of the working face bracket have no leakage, each connecting pin shaft is complete and intact, and the bracket support is powerful; scraper chains of the scraper conveyor and the reversed loader are intact, and the performance of driving equipment is good; the belt is intact without obvious damage, the driving device has good performance, the belt buckle is firm and reliable, and the triple roller and the straight roller are complete and intact; the cutting teeth of the drum of the coal mining machine are complete and firm, the connecting points of the machine body are fastened in place, the driving and traction devices have reliable performance, and the oil level is normal;
the method for maintaining and reinforcing the two closed ends of the old roadway in the step (1-1) comprises the following steps:
(1-1-1) removing U-shaped shed legs at the closed position of the old roadway according to the field condition, binding three four-inch pipelines at the position of the old roadway in the forward direction, and compacting the underground opening by using channel timbers; retaining a U-shaped shed support at the old roadway, and compacting the underground opening at the back of the U-shaped shed legs by using pipelines and road timbers, so that the old roadway is completely sealed in the stoping process, and sealed fracture and grout leakage are prevented;
(1-1-2) strengthening the reinforcement work before and after the sealing of the old roadway, and adopting an encrypted support for the roadway within the range of 5m before and after the sealing of the old roadway, so that the support strength of the roadway is improved, and the damage of dynamic pressure of the roadway to the sealing of the old roadway is reduced;
(1-1-3) reinforcing and fixing the wood piles hit by the coal wall sides of the old roadway area in advance to ensure that the wood piles are not scattered when the working face is pushed to the position of the wood piles, and the top beam of the working face support can pick up false roofs of wood pile construction to prevent the accident of roof falling in the end area;
various materials are reserved in the two lanes and the working face area in the step (1-1)
The method comprises the following steps:
(1-1-4) before the working face is mined out of the old lane, a certain amount of road wood, pi steel and single prop supporting materials are reserved at the advanced supporting head of the material lane, back-to-top supporting can be timely carried out when the working face top plate is broken and falls off, the single prop is used for assisting in pulling and moving the support, the top plate disturbance is reduced, and the working face top plate is ensured to be stable;
(1-1-5) reserving 1-2 air coal drills and lengthened drill rods on a working face sliding head, and carrying out advanced detection on the gas in the old roadway to ensure the safety of stoping;
(1-1-6) a plurality of circular ring chains and plate ring hoisting tools are reserved at the working face support, and when the chute on the working face inclines forwards, the chute can be hoisted and pushed in time, so that the state deterioration is prevented, and the normal propulsion is ensured;
(1-1-7) reserving 1-2 anchor rod cutters and air pipes on the working face, and when an old roadway is exposed on the front face of the working face, timely cutting off the anchor rod on the side of the old roadway, reducing equipment damage and ensuring normal operation;
(1-1-8) 5-6 long-handle rakes are reserved on the working face, the slurry output amount in an old roadway is large, and when a coal mining machine cannot cut normally, slurry can be timely cleaned into a chute, so that the working face is guaranteed to be normally pushed;
(1-1-9) spare wire clippers, hammers and pneumatic pick tools are arranged at the tail end of the sliding chute and are used for breaking spraying bodies, belt foundations and pouring bodies in the old roadway, reducing equipment damage and ensuring normal operation of the equipment;
(1-1-10) installing a coal sweeper and a coal baffle plate on each belt pressing device and each belt head of the conveying lane to ensure that slurry on the belt can be cleaned in time, and reserving sawdust and sand materials to ensure normal operation of the belt;
(1-1-11) additionally arranging a set of waste rock separating device behind the large frame of the belt head of the conveying roadway, and timely separating and conveying the slurry and the sprayed object sundries in the old and the rural areas to ensure the system to be normal;
the concrete construction method in the step (2) comprises the following steps:
(2-1) when the working face head sliding propulsion is 10-15 m away from the inner wall of the transport lane old lane, arranging personnel to retract the pipeline and the road wood before the upper wall side old lane is sealed, ensuring normal propulsion of the working face during mining the old lane, performing bottom lying adjustment on the working face before the working face is mined the old lane according to the relation of the working face and the old lane, ensuring that the working face top plate is mined along the old lane bottom plate when the working face is mined the old lane, reducing the influence of slurry and materials in the old lane on normal mining of the working face, and ensuring normal propulsion of the working face; when the working face slide head is pushed to the position 10m away from the old lane, 3 sounding holes are drilled from the end position by using a long drill rod which is not less than 5m, the drilling holes are drilled at intervals of 5m from 5m away from the slide head in sequence, the gas in the old lane is detected, the working face slide head is pushed forwards in a mode of detecting 5m and collecting 3m, when the working face slide head is 5m away from the old lane, the old lane is penetrated, the gas condition in the old lane is checked, measures are taken in time to process when abnormality is found, and the old lane can be recovered and exposed only under the condition that the gas in the old lane is normal;
(2-2) in the pushing process of the rest 1.6m of the old roadway exposed from the chute head, the chute head bracket area and the lower forward loader area are completely hidden in the safe area of the working surface by people except a chute, a crusher and a driver, so that slurry is prevented from being leaked out;
(2-3) after the old lane is exposed on the front face of the working face, the speed of the coal mining machine must be reduced, the fall between the old lane and a bottom plate of the transportation lane at the head sliding section is smaller, and sundries of a material stone wall, a U-shaped shed and a grouting pipeline in the old lane must be processed in time, so that an iron cutter and material stone sundries of the coal mining machine are prevented, and equipment is protected; reinforcing the top plate management of the old lane area, ensuring that the support initial supporting force reaches more than 24MPa, disclosing the old lane area, drawing a forepoling, extending out a protection wall to maintain the old lane top plate, if the support front beam and the top beam are not connected in real time, backing the support front beam and the top beam with a road wood, and ensuring that the connection is compact; when a top plate in front of a support breaks a hollow top, a plate beam or pi steel is inserted into a top beam of the support, and the hollow top plate is maintained in advance; according to the relation between the working face and the old lane, the stoping position of the working face is adjusted in time in the stoping process, the stoping of a working face top plate along the old lane bottom plate is guaranteed, and the influence of old lane mud and materials on the propulsion of the working face is reduced; the inspection and monitoring work of the gas in the old roadway is enhanced, normal drilling detection is required according to measures, the position of the old roadway and the gas monitoring equipment of the coal mining machine are normally used, the old roadway gas is inspected by general defense department personnel each shift, and meanwhile, the old roadway is sprayed with water and ventilated in time in the stoping process, so that the temperature of a coal body is reduced, the concentration of the gas is diluted, abnormal conditions exist, the coal ash is poured into the old roadway and a stopping agent is added in time, and the safety of a working face during the stoping of the old roadway is ensured; personnel are arranged in time to pick and process the anchor rods, the anchor beams and the pipeline materials in the old lane, so that the equipment damage is reduced, and the normal operation of the system is ensured; according to the situations of old lane grouting and fly ash, after the old lane is exposed on the front side of a working face, the mud inflow amount is mainly monitored and controlled in the stoping process, the mud inflow position needs to be slowed down, and the mud is prevented from overflowing a chute;
(2-4) during the working face stoping process of the old roadway, the mining height of the working face is guaranteed to be more than 3.0m, when the working face bottom bulges due to the pressure of a top plate, manual bottom lying is arranged in time, and the phenomenon that the roof of a coal cutter is difficult to cut due to the fact that a chute is turned over by the drum is prevented; arranging a specially-assigned person to carry out the inspection operation of the belt system, enhancing the use and maintenance of a coal scraper, a coal baffle and a gangue separating device of the belt system, and ensuring the normal operation of the belt system; when the bottom plate of the working surface is slimed and softened and the chute on the working surface is pricked to cause the chute to be turned over, the chute is laid and hung on the bottom plate before each class of frame, so that the chute is ensured to be flat and the height of the chute passing machine is ensured; during the mining period of the old roadway, exposed stone walls, stone bottom arches and belt heads are poured into the foundation, the inspection, overhaul and maintenance of equipment on the working face are enhanced, the overhaul of the equipment and the good state of the working face are ensured, and the rapid propulsion and continuous propulsion of the working face are ensured; the operation is strictly carried out according to the requirements, the gas management and fire prevention and extinguishing work of the old lane passing through the working face are well done, and the safe propulsion of the working face is ensured; for the old lane with the missed roof and the roof fall, firstly adopting a method of fixing anchor rods at the missed roof area and around the missed roof area in the stoping process to stabilize the roof plate of the missed roof area and prevent further missed roof accidents; secondly, the forepoling is pulled to protect the top in time, the front top plate is supported by a support front beam in a protecting mode, the disturbance of a coal cutter to the top plate in a missed area is reduced as much as possible in the coal cutting process, the method that the coal cutter only cuts a bed knife is adopted, the forepoling is pushed, slid and pulled in time after a bottom plate is cleaned, and therefore the top plate in front of the coal wall of the working face is controlled, and the possibility that the top plate falls further is reduced; reinforcing support management of two roadways, timely replacing extruded side columns, lost foot columns and discharged liquid in the two roadways, and performing column changing treatment, so that the support strength of the roadways is ensured, the shrinkage deformation of the roadways is reduced, and the normal propulsion of a working face is ensured; if the slurry output amount in the old lane is large, maintaining personnel on posts along the conveying line, cleaning slurry along the belt and at the belt transfer point, adjusting the running state of the belt and ensuring the normal propulsion of a working face; in the working face inclination adjusting and stoping process, the working face chute flees downwards at any time by adjusting the pushing sequence of the chute and matching with the adjustment mode of the working face antiskid device, so that the chute is reasonably lapped with a reversed loader;
(2-5) after the working face pushes through the old roadway roof to be stable, gradually lifting the bottom along 4-7 layers for stoping, and adjusting to the requirement of normal mining and discharging circulation;
after the old roadway is exposed on the front face of the working face, the mud inflow amount is monitored and controlled in an important mode in the stoping process, and the steps (2-4) are as follows:
(2-4-1) exposing an old roadway on the front side of a working face, slowing down the traction speed of a coal mining machine when slurry is gushed out, repeatedly returning the machine in sections, mixing the machine with coal, simultaneously opening a rear scraper conveyer to discharge the coal, mixing the slurry pulled by a front scraper conveyer again, reducing the viscosity of the slurry and preventing bin blockage;
(2-4-2) when a large amount of mud gushes out from the old lane exposed on the working face, timely informing a driver at a post of a peripheral transportation system of paying attention to the amount of the drawn mud, and when a large amount of mud enters the peripheral system, immediately stopping the equipment from running at a post along the line, and carrying the mud out in a segmented mode in a inching mode to prevent the mud from blocking the transportation system along the line and influencing the normal propulsion of the working face;
(2-4-3) stopping time of a maintenance class or a production class is used for treating flowing slurry disclosed by the coal wall of the working face by adopting manual bagging, so that influence of the slurry on a system is reduced;
the construction method for the transport lane region passing through the old lane in the step (2-5) comprises the following steps:
(2-5-1) before and during the working face mining of the old roadway, removing a roadway support center pillar and a lower side pillar in front of an end frame, retaining support pi steel and a road wood above the end frame, and retaining the support mode of the lower side pillar, so that the support strength of the roadway at the closed position of the transportation roadway at the lower side of the end frame and the old roadway is ensured, and the influence on the normal propulsion of the working face caused by the fact that the old roadway is pressed, broken and slurry is discharged is prevented; the reserved single prop at the lower side is withdrawn behind the end frame, and if a top plate at the rear of the end frame falls off and the operation space cannot meet the requirement of safe operation, the support single prop is not withdrawn;
(2-5-2) after the old lane is exposed on the front surface of the working surface, arranging personnel at each transfer point of the sliding head and the belt to carry out the cleaning work of the anchor rods and the spraying body sundries, reducing the influence of the sundries on the operation of the system and ensuring the normal propulsion of the working surface.
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| CN110259509B (en) * | 2019-05-09 | 2020-09-29 | 华北科技学院 | Trough type dredging method for treating water burst of downward-inclined mining goaf for coal mine |
| CN110424992A (en) * | 2019-08-08 | 2019-11-08 | 四川川煤华荣能源股份有限公司 | The method in the lane Inclined Full-mechanized Mining Face Guo Jiu |
| CN110700832B (en) * | 2019-11-22 | 2021-03-19 | 晋能控股煤业集团有限公司 | Mining method under complex condition of panel coal pillar working surface |
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| RU2210668C2 (en) * | 1996-10-07 | 2003-08-20 | Стекольщиков Геннадий Гаврилович | Method of mining of flat and inclined coal seams |
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Denomination of invention: A method of mining through old roadway with inclined longwall under complex conditions Effective date of registration: 20221012 Granted publication date: 20210713 Pledgee: Yantai financing guarantee Group Co.,Ltd. Pledgor: LONGKOU MINING GROUP Co.,Ltd. Registration number: Y2022980018071 |
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