30results about How to "Prevent roof fall accidents" patented technology

The invention discloses a surrounding rock plastic zone size-based quantitative roadway support design method. The method comprises the following steps of: 1, carrying out calculation to determine a size of a radius R of a roadway surrounding rock plastic zone; 2, classifying roadway surrounding rocks according to the calculation result; 3, carrying out targeted support parameter design on different types of surrounding rocks according to the roadway surrounding rock classification result; and 4, modifying and adjusting support parameters according to on-site monitoring feedback information. According to the method, support parameters designed on the basis of plastic zone sizes are scientific and reasonable, and roadway surrounding rock classification is carried out by taking plastic zoneradius sizes as main indexes, so that targeted support parameter design is carried out on different types of surrounding rocks so as to ensure the scientificity and economy of roadway support design.For roadway support, the method is capable of playing a part of preventing roadways from roof fall accidents.

The invention provides a monitoring device and a monitoring method for a mining FBG roof separation layer. The device comprises a vertical measurement barrel and a packaging casing, wherein fixed pulleys, tape pulleys and constant-strength cantilever beams are symmetrically arranged in the packaging casing; a steel wire rope penetrates through the tape pulleys and the fixed pulleys and penetrates out from a steel wire rope guide hole in the top part of the vertical measurement barrel; one end of the steel wire rope is connected with an anchor head; a shallow part measurement point and a deep part measurement point are distributed inside a drill hole; the anchor head is pushed to the measurement points in the drill hole; when the stress of the steel wire rope changes, the stress change is displayed through wavelength values of an FBG A and an FBG B; a wavelength demodulation device is used for demodulating the wavelength values into digital signals, the digital signals are sent to a computer for real-time processing, and a separation layer numerical value is combined for drawing a separation layer quantity changing curve and a set separation layer boundary value; whether the separation layer exists is judged; and the data change of the roof separation layer is monitored in real time. Temperature compensation is performed with a differential form, on-line measurement of the roof separation layer is realized, the reliability and the accuracy are high, an early warning signal can be issued, and roof fall accidents can be avoided.

The invention discloses a medium-deep hole room pillar mining method for limestone underground mine mining. The method comprises the steps of: S10. exploiting a ramp, tunneling a first intermediate section haulage roadway along the front end of a to-be-mined stope room from the ramp, and tunneling an air return roadway along the rear end of the to-be-mined stope room from the ramp; S20. dividing an upper sub-layer and a lower sub-layer; S30. stoping the upper sub-layer, tunneling a roof cutting roadway, conducting slope expansion on the roof cutting roadway to form a roof cutting space in the stope room, transporting the ores generated by slope expansion out of the ground surface by the ramp; and S40. stoping the lower sub-layer, tunneling a second intermediate section haulage roadway from the ramp, blasting the lower sub-layer, and transporting the generated ores out of the ground surface by the ramp. The method provided by the invention has the advantages of small mining preparation workload, simple process and good ventilation conditions, etc. The labor production efficiency is high, the mining cost is low, and the ore block production capacity is large. The method can reduce the number of underground workers, shorten ore block stoping time, reduce the exposure time of workers in an open stope, and prevent roof fall accidents, and is a safe and efficient mining method.

The invention relates to methods for treating fully mechanized coal mining face roof accidents through flexible air bags. The methods comprise the treatment method for fully mechanized coal mining face roof caving, the treatment method for fully mechanized coal mining face roof caving and wall caving, the treatment method for fully mechanized coal mining face coal wall cheek corner non-supporting,and the treatment method for fully mechanized coal mining face roadway wall non-supporting. According to the methods, the flexible air bags are adopted and are pressurized through air inflation to replace to cantilever slabs, driven nogs, backboards and driven columns to provide temporary support, and quick roof connection and wall sealing are ensured; and finally through timely pulling and moving of a support and control over a caved roof, a caved wall area, the coal wall cheek corners, the roadway walls and nearby surrounding rocks, the problems of fully mechanized coal mining face roof caving, the wall caving area, coal wall cheek corner non-supporting, roadway wall non-supporting and the like can be solved quickly, safely and reliably. The methods are simple, operation is easy, the effect is good, and the reliable guarantee is provided for construction safety; and the problems that as for existing methods, in the treating process, roof caving work and aloft work are needed, the construction technology is complex, the construction time is long, and the construction safety is difficult to guarantee are solved.

The invention relates to an exploitation tunneling shield support for a mine. In the coal exploitation process, in order to prevent roof falling accidents, a hydraulic support needs to be used for timbering a top plate. As a top beam of the hydraulic support is rigid, and uneven loads between the top beam and the top plate will be caused by unevenness generated by directly supporting the plate, the local roof falling accidents will be easily caused, and even the safety hidden dangers of causing large mine roof falling accidents exist. The exploitation tunneling shield support for the mine comprises a base, the top beam, a crawler device and a first hydraulic cylinder, a plurality of second hydraulic cylinders are arranged on the top beam, and the top plate is connected to the top ends of the second hydraulic cylinders. The exploitation tunneling shield support has the advantages of being simple in structure, safe and convenient to operate, good in timbering performance, easy to apply and popularize and the like; the roof falling accidents can be effectively prevented, and the coal exploitation operation safety is guaranteed.

The invention provides a top-shoveling and bottom-cutting type full-seam mining fully-mechanized coal mining method for an extrasoft thick coal seam. The method comprises the following steps of: tunneling along the top of a coal seam in a mining roadway, wherein a lapping mode with a working face is a slantwise lapping mode, namely according to the propelling degree in every, manually bottoming bottom coal along the propelling direction of the work surface in a fully mechanized coal mining work surface mining roadway, and recovering the bottom coal in the roadway by using the lapping method. In the recovery process, the girder end distance of a top girder of a support is approximate to zero or a negative value, the front end of a shovel type telescopic girder is provided with a coal shoveling board, and after the bottom coal is cut by a front expansion cylinder of a coal mining machine, the coal shoveling board can timely extend out, so that top coal can be shoveled under the condition that the top coal can not be sufficiently dribbled, an exposed roof can be timely protected, and the roof caving accident can be avoided. The stroke of the telescopic coal shoveling board is greater than a web of the coal mining machine, and fallen coal is filled by a back expansion cylinder. For the coal seam condition of the extrasoft (f is less than 0.5) thick coal seam (3.5-6m), the method has the advantages of being cost-saving, simple in technology, safe, high-efficiency and the like.

The invention provides a tunnel anti-roof-caving supporting method under influences of repeated mining. The method includes the steps of primarily supporting a tunnel, establishing a tunnel model, determining the tunnel anti-roof-caving theoretical key stage under the influences of repeated mining, collecting top plate displacement and surface displacement deformation of the tunnel in real time, determining the tunnel anti-roof-caving actual key stag range under the influences of repeated mining according to the top plate displacement and surface displacement deformation, collecting the breakage depth of the actual key stage range in real time, and conducting reinforced supporting on the tunnel according to the breakage depth. By means of the tunnel model, the tunnel anti-roof-caving theoretical key stage under the influences of repeated mining is obtained; in combination with the top plate displacement and surface displacement deformation, the actual key stage range is obtained; the reinforced supporting is conducted on the tunnel in the actual key stage range, roof caving accidents of the tunnel under the influences of repeated mining can be effectively avoided, and the tunnel maintains safe and stable.

The invention relates to the technical field of supports, in particular to a mining drivage shielding support for coal mine. The mining drivage shielding support for coal mine comprises a base, a topbeam and a crawler device. One ends of multiple first fulcrum rods are hinged to the left side of the base, one ends of multiple second fulcrum rods are hinged to the right side of the base, the middles of the first fulcrum rods and the second fulcrum rods are hinged, the other ends of the first fulcrum rods are hinged to one ends of the second fulcrum rods above the first fulcrum rods, one ends of the second fulcrum rods are hinged to one ends of the first fulcrum rods above the second fulcrum rods, and the middles of the first fulcrum rods above the second fulcrum rods and the second fulcrumrods are hinged. The mining drivage shielding support has the advantages of being simple in structure, convenient and safe to operate, good in supporting performance, easy to apply and popularize andthe like, puking accidents can be effectively avoided, the safety of the coal mining operation is guaranteed, a roof is not likely to deviate during supporting through guide rods, first hydraulic cylinders are evenly arranged at intervals, it can be effectively avoided that several portions are stressed excessively, the top beam is not prone to deformation, and supporting is firm and safe.

The invention discloses a detection device and a detection method for the axial force of an anchor rod. An integrated structure of the device is a regular hexagonal prism; an upper end cover and a lower end cover are respectively connected with a protective shell through fastening screws; a plurality of two-pole U-shaped magnetic cores are uniformly disposed at an outer side of an anchor rod fastening nut; the two-pole U-shaped magnetic cores are located in a space encircled by the upper end cover, the lower end cover and the protective shell; silicon rubber sleeves are sleeved on two magneticpoles of the two-pole U-shaped magnetic cores; a magnetic fluid is filled in each of the silicon rubber sleeves; a circuit slot is disposed in the space encircled by the upper end cover, the lower end cover and the protective shell; a control circuit is disposed in the circuit slot; a wire led from the control circuit passes through the circuit slot to wind an excitation coil and a detection coilto upper and lower ends of the two-pole U-shaped magnetic cores; elastic sheets are disposed at outer sides of the two-pole U-shaped magnetic cores; and the elastic sheets are fixed on an inner wallof the protective shell. The detection device and the detection method for the axial force of the anchor rod are used for detecting the axial force of the anchor rod, the collapse and cave-in of a topplate are avoided, a top plate support parameter is provided, and a reliable technical parameter is provided for support design of a laneway layout and safety monitoring of the top plate.

The invention discloses a movable mining tunneling arch-shaped flexible shield support for a coal mine. The movable mining tunneling arch-shaped flexible shield support comprises a base and a crawler device installed at the bottom of the base; the two ends of the top of the base are connected with a top beam through two hydraulic props; the two ends of the top beam are connected with the tops of the two hydraulic props in a groove mode respectively; the top beam is in an arch shape and is bent towards the direction of a goaf area; a cushion block is fixed to the lower end of the top beam; the higher end of the top beam and the cushion block are provided with groove type limiting holes; and the tops of the two hydraulic props are connected with the two groove type limiting holes through springs respectively. The movable mining tunneling arch-shaped flexible shield support can be used for supporting and shielding a large number of rock blocks collapsed in the goaf area, has a good effect on rock blocks with broken top plates, and has good applicability to inclined and steeply inclined mining tunneling projects; the hydraulic props can buffer impact force generated when the rock blocks roll down, roof caving accidents can be effectively prevented, and the safety of mining operation is guaranteed; and the movable mining tunneling arch-shaped flexible shield support has the advantages of being good in supporting performance, easy to apply and popularize and the like, and has good practicability.

The invention relates to a coal mine roadway supporting method. The coal mine roadway supporting method comprises the following steps that S1, a roadway is excavated; S2, an impact danger area is determined, and then it is determined that the basic supporting range is 200-250 m in front of a current working face; S3, anchor cable holes and anchor rod holes are drilled in the impact danger area and the non-impact danger area correspondingly; S4, anchor cables and anchor rods are installed in the anchor cable holes and the anchor rod holes correspondingly, and top ends of the anchor cables and top ends of the anchor rods penetrate through the coal seam in the roadway and are fixed to the bedrock layer; S5, the anchor cables and the anchor rods are fixed through the trays, and basic supporting is completed; and S6, advance supporting is carried out to support a top plate of the roadway, and the advance support range is 200-250m in front of the current working face. According to the method, the basic supporting range and the advance supporting range are expanded, the ranges can cover the affected area in the coal mining process, and the roof caving accident can be effectively prevented. In addition, in the basic support, the anchor rods and the anchor cables are directly fixed to the firm bedrock layer, and support stability can be further improved.