EP2801697A1 - Longwall working face, non-pillared mining method - Google Patents
Longwall working face, non-pillared mining method Download PDFInfo
- Publication number
- EP2801697A1 EP2801697A1 EP12864300.4A EP12864300A EP2801697A1 EP 2801697 A1 EP2801697 A1 EP 2801697A1 EP 12864300 A EP12864300 A EP 12864300A EP 2801697 A1 EP2801697 A1 EP 2801697A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mining
- headentry
- top panel
- pillared
- face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005065 mining Methods 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000005422 blasting Methods 0.000 claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000011282 treatment Methods 0.000 claims description 2
- 239000011435 rock Substances 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 7
- 230000000717 retained effect Effects 0.000 description 4
- 230000008093 supporting effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 2
- 229920006327 polystyrene foam Polymers 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
Definitions
- the present disclosure relates to a coal seam mining method, and particularly to a longwall working face coal seam mining method.
- a longwall mining usually adopts means of retaining pillars to protect a tailentry roadway.
- the widths of retained pillars are increased due to the rapidly increased ground stress.
- large engineering quantity of roadways, high development ratio, low production efficiency, severe resource waste in the deep mining process, and safety hazards such as gas outbursts, frequent rock bursts and air leakage in the goafs caused by the retained pillars, have become important problems that are disturbing and affecting mine safety and efficiency.
- Goaf-side entry driving refers to the following: after the previous working face extracting is completed, a top panel of the mining face is fully caved, waste rocks are extruded and compacted, the behaviors of the ground pressure in cover rocks stop, and surrounding rocks are stable, a pressure relief zone is formed in the goaf and the edge of coal mass, and a new roadway is driven again in the pressure relief zone.
- entry driving can only be performed after a working face of the previous district sublevel extracting is completed and the top panel of the mining face is completely caved and compacted, and hence a long time is required, thereby resulting in difficult production replacement of many mines in China.
- Goaf-side entry retaining refers to the following: in the extracting process of the working face, a headentry in the working face is retained by relevant technology and taken as a tailentry for extracting of the next working face.
- a headentry in the working face is retained by relevant technology and taken as a tailentry for extracting of the next working face.
- In the current goaf-side entry retaining technology in the aspect of roadway inner support, technology such as wooden shed, I-shaped steel shed, telescopic support and bolt mesh anchor has been developed in succession.
- roadway side support technology such as timber crib, dense pillar, waste pack, concrete block, paste backfilling and high-water-content material refilling has been developed.
- the supporting function of a roadway side coal mass is ignored; there are few applications for active roadway support technology; the roadway side support and the surrounding rock deformation are uncoordinated; and the support design is not systematic.
- the objective of the present disclosure is to overcome the defects in the prior art and provide a longwall working face non-pillared mining method having advantages of reliable support, high mining efficiency and no requirement of pillars.
- the present disclosure provides a longwall working face non-pillared mining method, includes steps of:
- step (2) further includes steps of: mounting a sensor on the top panel of the headentry, and wire-transmitting signals to the ground for remotely real-time monitoring of the status of the headentry.
- An anchor rod with constant resistance and large deformation is adopted in the step (2) to reinforce the top panel of the headentry.
- a bidirectional energy collecting pre-splitting blasting method is adopted in the step (4) to perform a directional kerfing.
- the roadways need also to be subjected to leakproof and fireproof treatments.
- the sensor in the step (2) includes a top panel separation indicator and an anchor rod stress analyzer.
- the longwall working face non-pillared mining method provided by the present disclosure has one or more of the following prominent substantive features and notable progresses.
- the energy collecting holes for pre-splitting blasting are drilled on the working face side of the top panel of the headentry; blasting is performed at the position corresponding to the energy collecting hole; the kerf extending along the original headentry is formed on a side of the top panel close to the mining face; the goaf is caved along the kerf, so that the roadway can be automatically formed at the position of the original headentry; the top panel of the roadway cannot be affected by goaf carving and can be kept in good state; then the roadway is taken as a tailentry of the next mining face, and the next mining process is performed continuously; and every two mining faces are continuous and not supported by pillars.
- the longwall working face non-pillared mining method has prominent substantive features.
- the longwall working face non-pillared mining method provided by the present disclosure achieves the objective of non-pillared support and high coefficient of mining.
- the time of continuous coal seam mining can be reduced under the premise of safety, and hence the longwall working face non-pillared mining method provided by the present disclosure has significant progress compared with the prior art.
- a first mining face needs to be formed at first.
- the method for forming the first mining face 1 is the same as the traditional method including steps of: determining a primary mining position on a mining edge of a coal seam, and excavating two parallel roadways 2 and 3 at the position by an S100A roadheader.
- the two parallel roadways 2 and 3 are communicated with each other at the tails through a roadway 4.
- the roadway 2 close to the edge is a tailentry; the roadway 3 close to the next mining face is a headentry; and the roadway for communicating the tailentry 2 and the headentry 3 is an extracting face 4.
- Each mining face must be provided with two roadways; the tailentry is a material delivery roadway; and the headentry is an air return roadway.
- the mining process begins from the extracting face 4 until all the coals in areas between the tailentry 2 and the headentry 3 are worked out, and then the next mining face is mined.
- the supporting process includes passive support and active support.
- the passive support is to set up a frame in the headentry 3, and the frame passively bears the pressure from a top panel of the headentry 3.
- the supporting means has the defects of high material consumption, high cost and limited supporting effect.
- the active support is to additionally arrange an anchor rod on the top panel 5 of the headentiy 3 to reinforce the top panel 5.
- the anchor rod 6 is usually 5 to 10 m in length and prop the top panel 5 of the headentry 3 by being connected with a relatively stable rock mass on an upper layer.
- the common anchor rod has a small deformation and can be easily broken.
- An anchor rod with constant resistance and a large deformation is adopted for reinforcement in the present disclosure.
- the anchor rod with constant resistance and a large deformation has been disclosed in detail in the patent publication document CN 01858225B .
- the anchor rods with constant resistance and large deformation 6 are uniformly distributed on the top panel 5 of the headentry 3 of the first mining face 1, and the spacing is set to be 2 to 5 m as required.
- the anchor rod with constant resistance and large deformation 6 is an anchor rod designed for large-deformation roadways and high-stress roadways, where the constant resistance can be maintained and the elongation is maintained by a mechanical slide means.
- the anchor rod with constant resistance and large deformation 6 includes a nut 61, a ball pad 62, a tray 63, a constant-resistance device 64, a connecting sleeve 65 and a rod body 66.
- the constant-resistance device 64 has a cylindrical structure and is sleeved at the tail of the rod body 66; the tray 63 and the nut 61 are sleeved at the tail of the constant-resistance device 64 in sequence; a central portion of the tray 63 is provided with a hole through which the constant-resistance device 64 passes; the nut 61 is in a threaded connection with the constant-resistance device 64; the ball pad 62 for buffer is disposed between the nut 61 and the tray 63; and the connecting sleeve is disposed at the other end of the constant-resistance device 64.
- the anchor rod with constant resistance and large deformation 6 can still maintain constant working resistance after extension; when the deformation energy of the surrounding rocks is less than the constant working resistance of the anchor rod with constant resistance and large deformation 6, and the constant-resistance device 64 is restored and tightly sleeved on the rod body 66, the roadway is in a stable state again, and hence the stability of the roadway can be achieved and the safety hazards such as the impact of the top panel falling can be eliminated.
- the bearing capacity of the anchor rod with constant resistance and large deformation 6 is in a range of 15 to 20 KN and the elongation thereof can reach 300 to 600 mm. Therefore, the anchor rod with constant resistance and large deformation 6 has a large deformability so as to be adapted to the high deformability of goaf roadways.
- energy collecting holes 7 linearly arranged are drilled up on the top panel 5 of the headentry 3 of the first mining face 1, close to a side of the first mining face, in sequence by an MQT-120J drill, so that the blasting process can be conveniently achieved by the energy collecting holes 7 and hence the directional kerf can be achieved.
- the pitch of the energy collecting holes 7 is 2 to 5 m and determined by the characteristics of actual strata.
- the roadways 2, 3 and 4 need also to be sprayed with urea-formaldehyde polystyrene foam for leakage resistance and fire resistance.
- a top panel separation indicator and an anchor rod stress analyzer are also disposed on the top panel 5 of the headentry 3 of the first mining face, and shape and position sensors may be also mounted at a corresponding position of the side wall and bottom surface of the headentry 3.
- the top panel separation indicator is mounted on the top panel 5 and can detect the variation of the relative displacement of a determined near point relative to a determined far point, so as to monitor the fall state of the top panel 5;
- the anchor rod stress analyzer is mounted on the top panel 5 through the anchor rod 6 and can detect the pressure of the top panel 5 on a top face of the tray 63 of the anchor rod with constant resistance and large deformation 6, so as to monitor the variation of the fall pressure of the top panel 5;
- the shape and position sensors are respectively mounted on the top panel 5, the bottom surface and two side walls of the headentry 3 and configured to monitor the variation of the cross-sectional shape of the headentry.
- Signals monitored by the top panel separation indicator, the anchor rod stress analyzer and the shape and position sensors are all transmitted to the ground through a wire and subjected to data conversion on the ground; converted data are remotely transmitted by means of Ethernet and the like; hence workers can remotely monitor and analyze the data, so as to remotely monitor the state of the headentry 3 in real time.
- the mining face is gradually extracted until a goaf is formed.
- a side wall on a side of the headentry 3 of the first mining face 1 is eliminated; the headentry 3 and the goaf are merged together; and the roadway is eliminated.
- a bidirectional energy collecting pre-splitting blasting device is mounted at the position corresponding to energy collecting holes 7 on the top panel 5 of the original headentry 3; a blasting lead is connected for the pre-splitting blasting of the top panel 5 at the position; and a pre-splitting face is formed on a side of the top panel 5 of the original headentry 3, close to the goaf.
- the pre-splitting face is a kerf, bidirectionally extending along the original headentry 3, on a side of the top panel 5 close to the mining face, namely a directional kerfing is achieved on the top panel 5 of the original headentry 3.
- the bidirectional energy collecting pre-splitting blasting method is recorded in a Chinese patent ZL200610113007X .
- the blasting method can not only have the function of pre-splitting the surrounding rocks of the top panel 5 but also protect the top panel 5 from being damaged by blasting. Moreover, the blasting method has the advantages of simplicity, ease of use, good blasting effect, low cost and convenient operation.
- a blasthole is formed on a pre-splitting line by blasting technology; the bidirectional energy collecting device is adopted for charging; and the energy collecting direction is driven to correspond to the pre-splitting direction of a rock mass.
- a cohesive energy flow is formed by detonation products in two predetermined directions; a concentrated tensile stress is produced; and the pre-splitting hole is driven to run through the energy collecting direction to form the pre-splitting face.
- the explosive consumption is greatly reduced.
- the energy collecting device protects the surrounding rocks, the damage on the rock mass on the periphery of the drill hole is also greatly reduced. Therefore, the technology can not only achieve the objective of pre-splitting but also protect goaf roadway top panels.
- the bidirectional energy collecting device is processed by tubular products (including PVC pipes and metal pipes) with certain strength (the uniaxial compressive strength is 1.6 MPa to 2.0 MPa); the diameter of the energy collecting device is different according to the diameter of the hole and determined by the coefficient of the decoupling charge of specified rock mass; the energy collecting holes on the bidirectional tensile energy collecting device have various shapes and may be round, elliptical, square, rectangular and the like; and parameters of the energy collecting holes are determined by the lithologic characters and explosives.
- the pore size and the hole pitch of the energy collecting holes on the bidirectional tensile energy collecting device are relevant to the lithologic characters, the rock mass structure, the initial stress state of the engineering rock mass, and the like. Corresponding functional expressions need to be established.
- the parameters are designed according to relevant calculation results.
- the goaf is caved under the influence of the directional kerfing and the pressure from a deep stratum above the goaf.
- a directional kerfing is applied to the top panel 5 of the headentry 3 of the original first mining face, the top panel 5 of the headentry 3 of the original first mining face will not fall in the case of goaf caving;
- a slope of the haulage roadway 3 (namely an A area in FIG. 5 ) is formed after the caved goaf is caved along the pre-splitting face, on a pre-splitting side of the headentry 3; and a roadway is formed again at the position of the original headentry 3.
- the slope of the newly formed tailentry 3 is sprayed and sealed by plain concrete so as to prevent harmful gas such as gas and CO in the goaf from entering into the newly formed tailentry 3.
- the headentry 3 of the original mining face is retained and reutilized as a tailentry of the second mining face.
- a headentry of the second mining face is used as a tailentry of the third mining face by the technique of the present disclosure.
- the roadway 3 automatically formed at the position of the headentry of the original first mining face is taken as a tailentry of the next mining face; a headentry relative to the tailentry 3 is excavated; and a new mining face is formed. Meanwhile, the roadways must also be sprayed with urea-formaldehyde polystyrene foam for leakage resistance and fire resistance.
- the energy collecting holes 7 for pre-splitting blasting are drilled on the working face side of the top panel 5 of the headentry 3; blasting is performed at the position corresponding to energy collecting holes; a kerf extending along the original headentry 3 is formed on a side of the top panel 5 close to the mining face; the goaf is caved along the kerf, so that the roadway can be automatically formed at the position of the original headentry 3; the top panel 5 of the roadway 3 will not be affected by goaf caving and can be kept in good state; the roadway 3 is taken as a tailentry of the next mining face and the next mining process is continued; and every two mining faces are continuous and not supported by pillars. Therefore, compared with the prior art, the longwall working face non-pillared mining method provided by the present disclosure has prominent substantive features.
- the longwall working face non-pillared mining method provided by the present disclosure achieves a non-pillared support, has a high mining coefficient, does not require a long-term wait in the roadway forming process, and hence not only guarantees the safety but also reduces the time of continuous coal seam mining.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
Description
- The present disclosure relates to a coal seam mining method, and particularly to a longwall working face coal seam mining method.
- With the increased depth of coal mining, a longwall mining usually adopts means of retaining pillars to protect a tailentry roadway. In the case of a relatively deep roadway, the widths of retained pillars are increased due to the rapidly increased ground stress. In the goaf-side entry retaining (driving) mining process of the traditional longwall mining method, large engineering quantity of roadways, high development ratio, low production efficiency, severe resource waste in the deep mining process, and safety hazards such as gas outbursts, frequent rock bursts and air leakage in the goafs caused by the retained pillars, have become important problems that are disturbing and affecting mine safety and efficiency.
- At present, the research on non-pillared mining in main mining countries domestically and abroad mainly focuses on two aspects: goaf-side entry driving and goaf-side entry retaining. Goaf-side entry driving refers to the following: after the previous working face extracting is completed, a top panel of the mining face is fully caved, waste rocks are extruded and compacted, the behaviors of the ground pressure in cover rocks stop, and surrounding rocks are stable, a pressure relief zone is formed in the goaf and the edge of coal mass, and a new roadway is driven again in the pressure relief zone. In the goaf-side entry driving, entry driving can only be performed after a working face of the previous district sublevel extracting is completed and the top panel of the mining face is completely caved and compacted, and hence a long time is required, thereby resulting in difficult production replacement of many mines in China.
- Goaf-side entry retaining refers to the following: in the extracting process of the working face, a headentry in the working face is retained by relevant technology and taken as a tailentry for extracting of the next working face. In the current goaf-side entry retaining technology, in the aspect of roadway inner support, technology such as wooden shed, I-shaped steel shed, telescopic support and bolt mesh anchor has been developed in succession. In the aspect of roadway side support, technology such as timber crib, dense pillar, waste pack, concrete block, paste backfilling and high-water-content material refilling has been developed. Despite some achievements, there are still many deficiencies and problems: the supporting function of a roadway side coal mass is ignored; there are few applications for active roadway support technology; the roadway side support and the surrounding rock deformation are uncoordinated; and the support design is not systematic.
- The objective of the present disclosure is to overcome the defects in the prior art and provide a longwall working face non-pillared mining method having advantages of reliable support, high mining efficiency and no requirement of pillars.
- In order to achieve the objective of the present disclosure, the present disclosure provides a longwall working face non-pillared mining method, includes steps of:
- (1) excavating two communicated roadways on a coal seam as a tailentry and a headentry of a first mining face;
- (2) reinforcing a top panel of the headentry and drilling on the working face side of the top panel of the headentry a plurality of energy collecting holes for pre-splitting blasting;
- (3) extracting until a goaf is formed, and the roadway is eliminated;
- (4) blasting at a position corresponding to the energy collecting holes on the top panel of the original headentry of the goaf, and forming a directional kerf, extending up and down along the entire original headentry, on a side of the top panel close to the mining face;
- (5) making the top panel of the mining face collapse by the pressure from a deep stratum on an upper portion of the goaf, and forming a new roadway at a position of the original headentry;
- (6) taking the roadway, automatically formed at the position of the original headentry, as a tailentry of a next mining face, and excavating a headentry relative to the tailentry, to form a new mining face; and
- (7) repeating steps (2) to (6), and continuing to mine coal until coal seam mining is completed.
- In order to further achieve the objective of the present disclosure, step (2) further includes steps of: mounting a sensor on the top panel of the headentry, and wire-transmitting signals to the ground for remotely real-time monitoring of the status of the headentry. An anchor rod with constant resistance and large deformation is adopted in the step (2) to reinforce the top panel of the headentry. A bidirectional energy collecting pre-splitting blasting method is adopted in the step (4) to perform a directional kerfing. In the steps (1) and (6), the roadways need also to be subjected to leakproof and fireproof treatments. The sensor in the step (2) includes a top panel separation indicator and an anchor rod stress analyzer.
- Compared with the prior art, the longwall working face non-pillared mining method provided by the present disclosure has one or more of the following prominent substantive features and notable progresses. In the longwall working face non-pillared mining method provided by the present disclosure, the energy collecting holes for pre-splitting blasting are drilled on the working face side of the top panel of the headentry; blasting is performed at the position corresponding to the energy collecting hole; the kerf extending along the original headentry is formed on a side of the top panel close to the mining face; the goaf is caved along the kerf, so that the roadway can be automatically formed at the position of the original headentry; the top panel of the roadway cannot be affected by goaf carving and can be kept in good state; then the roadway is taken as a tailentry of the next mining face, and the next mining process is performed continuously; and every two mining faces are continuous and not supported by pillars. Therefore, compared with the prior art, the longwall working face non-pillared mining method has prominent substantive features. In addition, the longwall working face non-pillared mining method provided by the present disclosure achieves the objective of non-pillared support and high coefficient of mining. Moreover, as long term is not required in the roadway forming process, the time of continuous coal seam mining can be reduced under the premise of safety, and hence the longwall working face non-pillared mining method provided by the present disclosure has significant progress compared with the prior art.
-
-
FIG. 1 is a schematic structural top view of a mining face in a longwall working face non-pillared mining method provided by the present disclosure; -
FIG. 2 is a schematic structural front view of the mining face in the longwall working face non-pillared mining method provided by the present disclosure; -
FIG. 3 is a schematic structural view illustrating the reinforcement and drilling of a headentry of a first mining face in the longwall working face non-pillared mining method provided by the present disclosure; -
FIG. 4 is a schematic structural view illustrating the process of forming a goaf on the first mining face in the longwall working face non-pillared mining method provided by the present disclosure; -
FIG. 5 is a schematic structural view illustrating the process of goaf carving in the longwall working face non-pillared mining method provided by the present disclosure; and -
FIG. 6 is a schematic structural view of an anchor rod with constant resistance and large deformation in the longwall working face non-pillared mining method provided by the present disclosure. - Reference numerals in the accompanying drawings: 1 - first mining face, 2 - tailentry, 3 - headentry, 4 - extracting face, 5 - top panel, 6 - anchor rod with constant resistance and large deformation, 7 - energy collecting hole, 61 - nut, 62 - ball pad, 63 - tray, 64 - constant-resistance device, 65 - connecting sleeve, 66 - rod body.
- Detailed description will be given below to the specif structural details and the installation and use process of a sludge discharge pipe floating body provided by the present disclosure.
- In the non-pillared mining method provided by the present disclosure, a first mining face needs to be formed at first. As illustrated in
FIGS. 1 and 2 , the method for forming thefirst mining face 1 is the same as the traditional method including steps of: determining a primary mining position on a mining edge of a coal seam, and excavating twoparallel roadways parallel roadways roadway 4. Theroadway 2 close to the edge is a tailentry; theroadway 3 close to the next mining face is a headentry; and the roadway for communicating thetailentry 2 and theheadentry 3 is an extractingface 4. Each mining face must be provided with two roadways; the tailentry is a material delivery roadway; and the headentry is an air return roadway. In actual mining, the mining process begins from the extractingface 4 until all the coals in areas between thetailentry 2 and theheadentry 3 are worked out, and then the next mining face is mined. - Subsequently, as illustrated in
FIG. 3 , theheadentry 3 of thefirst mining face 1 is supported. The supporting process includes passive support and active support. The passive support is to set up a frame in theheadentry 3, and the frame passively bears the pressure from a top panel of theheadentry 3. The supporting means has the defects of high material consumption, high cost and limited supporting effect. The active support is to additionally arrange an anchor rod on thetop panel 5 of theheadentiy 3 to reinforce thetop panel 5. Theanchor rod 6 is usually 5 to 10 m in length and prop thetop panel 5 of theheadentry 3 by being connected with a relatively stable rock mass on an upper layer. The common anchor rod has a small deformation and can be easily broken. An anchor rod with constant resistance and a large deformation is adopted for reinforcement in the present disclosure. The anchor rod with constant resistance and a large deformation has been disclosed in detail in the patent publication documentCN 01858225B . The anchor rods with constant resistance andlarge deformation 6 are uniformly distributed on thetop panel 5 of theheadentry 3 of thefirst mining face 1, and the spacing is set to be 2 to 5 m as required. - As illustrated in
FIG. 6 , the anchor rod with constant resistance andlarge deformation 6 is an anchor rod designed for large-deformation roadways and high-stress roadways, where the constant resistance can be maintained and the elongation is maintained by a mechanical slide means. The anchor rod with constant resistance andlarge deformation 6 includes anut 61, aball pad 62, atray 63, a constant-resistance device 64, a connectingsleeve 65 and arod body 66. The constant-resistance device 64 has a cylindrical structure and is sleeved at the tail of therod body 66; thetray 63 and thenut 61 are sleeved at the tail of the constant-resistance device 64 in sequence; a central portion of thetray 63 is provided with a hole through which the constant-resistance device 64 passes; thenut 61 is in a threaded connection with the constant-resistance device 64; theball pad 62 for buffer is disposed between thenut 61 and thetray 63; and the connecting sleeve is disposed at the other end of the constant-resistance device 64. - When the anchor rod with constant resistance and
large deformation 6 is applied to a roadway, if the deformation of surrounding rocks of the roadway exceeds the bearing range of the anchor rod, a relative displacement is generated by therod body 66 of the anchor rod and the constant-resistance device 64 provided with threaded structures on junction surfaces thereof, namely theanchor rod 6 is subjected to a large deformation representing a radial extension as the large deformation of the surrounding rocks. After the large deformation of the surrounding rocks, the energy thereof is released, but the anchor rod with constant resistance andlarge deformation 6 can still maintain constant working resistance after extension; when the deformation energy of the surrounding rocks is less than the constant working resistance of the anchor rod with constant resistance andlarge deformation 6, and the constant-resistance device 64 is restored and tightly sleeved on therod body 66, the roadway is in a stable state again, and hence the stability of the roadway can be achieved and the safety hazards such as the impact of the top panel falling can be eliminated. The bearing capacity of the anchor rod with constant resistance andlarge deformation 6 is in a range of 15 to 20 KN and the elongation thereof can reach 300 to 600 mm. Therefore, the anchor rod with constant resistance andlarge deformation 6 has a large deformability so as to be adapted to the high deformability of goaf roadways. - In addition,
energy collecting holes 7 linearly arranged are drilled up on thetop panel 5 of theheadentry 3 of thefirst mining face 1, close to a side of the first mining face, in sequence by an MQT-120J drill, so that the blasting process can be conveniently achieved by theenergy collecting holes 7 and hence the directional kerf can be achieved. The pitch of theenergy collecting holes 7 is 2 to 5 m and determined by the characteristics of actual strata. Meanwhile, theroadways - In the present disclosure, a top panel separation indicator and an anchor rod stress analyzer are also disposed on the
top panel 5 of theheadentry 3 of the first mining face, and shape and position sensors may be also mounted at a corresponding position of the side wall and bottom surface of theheadentry 3. The top panel separation indicator is mounted on thetop panel 5 and can detect the variation of the relative displacement of a determined near point relative to a determined far point, so as to monitor the fall state of thetop panel 5; the anchor rod stress analyzer is mounted on thetop panel 5 through theanchor rod 6 and can detect the pressure of thetop panel 5 on a top face of thetray 63 of the anchor rod with constant resistance andlarge deformation 6, so as to monitor the variation of the fall pressure of thetop panel 5; and the shape and position sensors are respectively mounted on thetop panel 5, the bottom surface and two side walls of theheadentry 3 and configured to monitor the variation of the cross-sectional shape of the headentry. 3. Signals monitored by the top panel separation indicator, the anchor rod stress analyzer and the shape and position sensors are all transmitted to the ground through a wire and subjected to data conversion on the ground; converted data are remotely transmitted by means of Ethernet and the like; hence workers can remotely monitor and analyze the data, so as to remotely monitor the state of theheadentry 3 in real time. - After completion of above works, the mining face is gradually extracted until a goaf is formed. As illustrated in
FIG. 4 , after the goaf is formed, a side wall on a side of theheadentry 3 of thefirst mining face 1 is eliminated; theheadentry 3 and the goaf are merged together; and the roadway is eliminated. - After the goaf is formed on the
first mining face 1, a bidirectional energy collecting pre-splitting blasting device is mounted at the position corresponding toenergy collecting holes 7 on thetop panel 5 of theoriginal headentry 3; a blasting lead is connected for the pre-splitting blasting of thetop panel 5 at the position; and a pre-splitting face is formed on a side of thetop panel 5 of theoriginal headentry 3, close to the goaf. The pre-splitting face is a kerf, bidirectionally extending along theoriginal headentry 3, on a side of thetop panel 5 close to the mining face, namely a directional kerfing is achieved on thetop panel 5 of theoriginal headentry 3. The bidirectional energy collecting pre-splitting blasting method is recorded in a Chinese patentZL200610113007X top panel 5 but also protect thetop panel 5 from being damaged by blasting. Moreover, the blasting method has the advantages of simplicity, ease of use, good blasting effect, low cost and convenient operation. - A blasthole is formed on a pre-splitting line by blasting technology; the bidirectional energy collecting device is adopted for charging; and the energy collecting direction is driven to correspond to the pre-splitting direction of a rock mass. A cohesive energy flow is formed by detonation products in two predetermined directions; a concentrated tensile stress is produced; and the pre-splitting hole is driven to run through the energy collecting direction to form the pre-splitting face. As rocks between drill holes are torn down, the explosive consumption is greatly reduced. Meanwhile, as the energy collecting device protects the surrounding rocks, the damage on the rock mass on the periphery of the drill hole is also greatly reduced. Therefore, the technology can not only achieve the objective of pre-splitting but also protect goaf roadway top panels. The bidirectional energy collecting device is processed by tubular products (including PVC pipes and metal pipes) with certain strength (the uniaxial compressive strength is 1.6 MPa to 2.0 MPa); the diameter of the energy collecting device is different according to the diameter of the hole and determined by the coefficient of the decoupling charge of specified rock mass; the energy collecting holes on the bidirectional tensile energy collecting device have various shapes and may be round, elliptical, square, rectangular and the like; and parameters of the energy collecting holes are determined by the lithologic characters and explosives. The pore size and the hole pitch of the energy collecting holes on the bidirectional tensile energy collecting device are relevant to the lithologic characters, the rock mass structure, the initial stress state of the engineering rock mass, and the like. Corresponding functional expressions need to be established. The parameters are designed according to relevant calculation results.
- As illustrated in
FIG. 5 , the goaf is caved under the influence of the directional kerfing and the pressure from a deep stratum above the goaf. As a directional kerfing is applied to thetop panel 5 of theheadentry 3 of the original first mining face, thetop panel 5 of theheadentry 3 of the original first mining face will not fall in the case of goaf caving; a slope of the haulage roadway 3 (namely an A area inFIG. 5 ) is formed after the caved goaf is caved along the pre-splitting face, on a pre-splitting side of theheadentry 3; and a roadway is formed again at the position of theoriginal headentry 3. The slope of the newly formedtailentry 3 is sprayed and sealed by plain concrete so as to prevent harmful gas such as gas and CO in the goaf from entering into the newly formedtailentry 3. In this way, theheadentry 3 of the original mining face is retained and reutilized as a tailentry of the second mining face. Similarly, in the case of extracting of the third mining face, a headentry of the second mining face is used as a tailentry of the third mining face by the technique of the present disclosure. - Finally, the
roadway 3 automatically formed at the position of the headentry of the original first mining face is taken as a tailentry of the next mining face; a headentry relative to thetailentry 3 is excavated; and a new mining face is formed. Meanwhile, the roadways must also be sprayed with urea-formaldehyde polystyrene foam for leakage resistance and fire resistance. - The above mining steps are repeated for continuing to mine coal until the coal seam mining is completed. And hence the longwall working face non-pillared mining process is achieved.
- In the present disclosure, the
energy collecting holes 7 for pre-splitting blasting are drilled on the working face side of thetop panel 5 of theheadentry 3; blasting is performed at the position corresponding to energy collecting holes; a kerf extending along theoriginal headentry 3 is formed on a side of thetop panel 5 close to the mining face; the goaf is caved along the kerf, so that the roadway can be automatically formed at the position of theoriginal headentry 3; thetop panel 5 of theroadway 3 will not be affected by goaf caving and can be kept in good state; theroadway 3 is taken as a tailentry of the next mining face and the next mining process is continued; and every two mining faces are continuous and not supported by pillars. Therefore, compared with the prior art, the longwall working face non-pillared mining method provided by the present disclosure has prominent substantive features. - The longwall working face non-pillared mining method provided by the present disclosure achieves a non-pillared support, has a high mining coefficient, does not require a long-term wait in the roadway forming process, and hence not only guarantees the safety but also reduces the time of continuous coal seam mining.
Claims (6)
- A longwall working face non-pillared mining method, comprising steps of:(1) excavating two communicated roadways on a coal seam as a tailentry and a headentry of a first mining face;(2) reinforcing a top panel of the headentry and drilling on a working face side of the top panel of the headentry a plurality of energy collecting holes for pre-splitting blasting;(3) extracting until a goaf is formed, and the roadway is eliminated;(4) blasting at a position corresponding to the energy collecting holes on the top panel of the original headentry of the goaf, and forming a directional kerf, extending up and down along the entire original headentry, on a side of the top panel close to the mining face;(5) making the top panel of the mining face collapse by a pressure from a deep stratum on an upper portion of the goaf, and forming a new roadway at a position of the original headentry;(6) taking a roadway, automatically formed at the position of the original headentry, as a tailentry of a next mining face, and excavating a headentry relative to the tailentry, to form a new mining face; and(7) repeating steps (2) to (6), and continuing to mine coal until the coal seam mining is completed.
- The longwall working face non-pillared mining method according to claim 1, characterized in that the step (2) further includes steps of: mounting a sensor on the top panel of the headentry, and wire-transmitting signals to the ground for remotely real-time monitoring of a status of the headentry.
- The longwall working face non-pillared mining method according to claim 1. characterized in that an anchor rod with constant resistance and large deformation is adopted in the step (2) to reinforce the top panel of the headentry.
- The longwall working face non-pillared mining method according to claim 1, characterized in that a bidirectional energy collecting pre-splitting blasting method is adopted in the step (4) to perform a directional kerfing.
- The longwall working face non-pillared mining method according to claim 1, characterized in that in the steps (1) and (6), the roadway is subjected to leakproof and fireproof treatments.
- The longwall working face non-pillared mining method according to claim 2, characterized in that the sensor in the step (2) includes a top panel separation indicator and an anchor rod stress analyzer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL12864300T PL2801697T3 (en) | 2012-01-06 | 2012-01-06 | Longwall working face, non-pillared mining method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2012/070109 WO2013102309A1 (en) | 2012-01-06 | 2012-01-06 | Longwall working face, non-pillared mining method |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2801697A1 true EP2801697A1 (en) | 2014-11-12 |
EP2801697A4 EP2801697A4 (en) | 2015-12-23 |
EP2801697B1 EP2801697B1 (en) | 2019-08-14 |
Family
ID=48744977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12864300.4A Active EP2801697B1 (en) | 2012-01-06 | 2012-01-06 | Longwall working face, non-pillared mining method |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2801697B1 (en) |
PL (1) | PL2801697T3 (en) |
WO (1) | WO2013102309A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104533419A (en) * | 2014-12-16 | 2015-04-22 | 湖南科技大学 | Method for partial recovery of residual coal from wide coal pillar |
CN104806246A (en) * | 2015-05-08 | 2015-07-29 | 贵州盘江精煤股份有限公司 | Gob-side entry retaining method for coal mine gateway by directional-predetermined crack blasting and truncating crest and pressure relief mode |
CN105065001A (en) * | 2015-07-31 | 2015-11-18 | 中国矿业大学(北京) | Gob-side entrydriving mining method of ultralong-propulsion-distance working face |
WO2016112771A1 (en) * | 2015-01-14 | 2016-07-21 | 中国矿业大学 | Complete non-coal-pillar continuous depressurized mining method for short-distance coal seam group |
CN106437713A (en) * | 2016-10-21 | 2017-02-22 | 山东科技大学 | Automatic coal feeding apparatus for fully mechanized coal face and coal feeding process recognition method |
CN106522952A (en) * | 2016-12-26 | 2017-03-22 | 山东科技大学 | Upper corner treatment method for large-dip-angle mining work face |
CN107013216A (en) * | 2017-05-16 | 2017-08-04 | 中国科学院武汉岩土力学研究所 | A kind of colliery deep mining impulsion pressure prevention and controls |
CN110130898A (en) * | 2019-07-09 | 2019-08-16 | 北京中矿创新联盟能源环境科学研究院 | Design method for non-pillar, non-roadway and non-roadway tunneling mine |
CN110984987A (en) * | 2019-12-23 | 2020-04-10 | 西安科技大学 | Large-inclination-angle coal seam working face local filling pillar-free mining method and system |
WO2021003772A1 (en) * | 2019-07-09 | 2021-01-14 | 北京中矿创新联盟能源环境科学研究院 | Method for coal mining without reserving coal pillar and tunneling roadway in whole mining area |
CN114278293A (en) * | 2021-12-03 | 2022-04-05 | 天地科技股份有限公司 | Method for cutting top of coal seam roof |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201407642D0 (en) | 2014-04-30 | 2014-06-11 | British American Tobacco Co | Aerosol-cooling element and arrangements for apparatus for heating a smokable material |
GB201418817D0 (en) | 2014-10-22 | 2014-12-03 | British American Tobacco Co | Apparatus and method for generating an inhalable medium, and a cartridge for use therewith |
GB201503411D0 (en) | 2015-02-27 | 2015-04-15 | British American Tobacco Co | Apparatus and method for generating an inhalable medium, and a cartridge for use therewith |
JP6725524B2 (en) | 2015-02-27 | 2020-07-22 | ブリティッシュ アメリカン タバコ (インヴェストメンツ) リミテッドBritish American Tobacco (Investments) Limited | Cartridge, component and method for generating aspirable media |
CN104808257B (en) * | 2015-03-10 | 2017-07-11 | 太原钢铁(集团)有限公司 | Complicated cavity drills exploration method in the oblique preservation ore body of steep dip |
CN107905790B (en) | 2015-06-24 | 2019-05-31 | 何满潮 | Broadwall N00 engineering method |
CN108222935B (en) * | 2015-06-24 | 2019-09-17 | 北京中矿创新联盟能源环境科学研究院 | Equipment system of roadway-free coal-pillar-free self-retained roadway mining method |
GB201517471D0 (en) | 2015-10-02 | 2015-11-18 | British American Tobacco Co | Apparatus for generating an inhalable medium |
GB201618481D0 (en) | 2016-11-02 | 2016-12-14 | British American Tobacco Investments Ltd | Aerosol provision article |
CN110469329B (en) * | 2018-05-10 | 2021-07-23 | 华亭煤业集团有限责任公司 | Mining method at last stage of mine stoping |
CN109707429B (en) * | 2019-03-07 | 2023-09-26 | 河南理工大学 | Tilting roadway is used for pressing and prevents falling joint support |
CN111578797B (en) * | 2020-07-06 | 2022-05-31 | 酒泉钢铁(集团)有限责任公司 | Underground medium-length hole blasting suspended roof processing method |
CN111828005B (en) * | 2020-07-24 | 2021-03-30 | 北京中矿创新联盟能源环境科学研究院 | Face mining method |
CN114215592B (en) * | 2021-11-30 | 2024-07-16 | 中国矿业大学 | Green mining method for filling long-wall working face gangue and ultra-high water material |
CN115183639B (en) * | 2022-06-14 | 2023-03-14 | 安徽理工大学 | Three-face upper-breaking single-roadway down-cutting blasting construction method for roof-cutting retained roadway |
CN115263308B (en) * | 2022-08-30 | 2023-08-08 | 乌海市天誉煤炭有限责任公司 | Blasting roof-cutting gob-side entry retaining method |
CN117266855B (en) * | 2023-11-23 | 2024-01-19 | 太原理工大学 | Pressure relief and permeability improvement method and system for ultrathin layered mining of coal seam |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5668325A (en) * | 1996-03-27 | 1997-09-16 | Cyprus Amax Coal Company | Method and apparatus for determining compressive stress in pillars |
RU2209315C2 (en) * | 2001-02-16 | 2003-07-27 | Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (Технический университет) | Method of mining of outburst-prone and gassy coal seams |
CN100455978C (en) * | 2006-09-06 | 2009-01-28 | 何满潮 | Bidirectional energy gathering tension shaping blasting cartridge |
CN100580219C (en) * | 2007-04-10 | 2010-01-13 | 闫振东 | Underground no pillar recovery method of coal mine |
CN100462523C (en) * | 2007-06-29 | 2009-02-18 | 淮南矿业(集团)有限责任公司 | Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method |
RU2391507C2 (en) * | 2008-04-14 | 2010-06-10 | Григорий Кондратьевич Александров | Pilarless development method of coal beds |
CN101824985B (en) * | 2010-03-25 | 2012-08-01 | 巩庆刚 | Non-coal pillar mining method of protective coal pillars in coal mine |
CN101864956B (en) * | 2010-04-08 | 2013-07-03 | 中国矿业大学 | Sectional coal pillar-free exploitation method |
CN101858225B (en) * | 2010-06-10 | 2011-10-12 | 北京中矿深远能源环境科学研究院 | Constant resistance and large deformation anchor rod |
CN102011588A (en) * | 2010-11-30 | 2011-04-13 | 淄博市王庄煤矿 | House pillar type cutting and filling method of medium coal seam for controlling movement deformation of overlying rock |
-
2012
- 2012-01-06 WO PCT/CN2012/070109 patent/WO2013102309A1/en active Application Filing
- 2012-01-06 EP EP12864300.4A patent/EP2801697B1/en active Active
- 2012-01-06 PL PL12864300T patent/PL2801697T3/en unknown
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104533419A (en) * | 2014-12-16 | 2015-04-22 | 湖南科技大学 | Method for partial recovery of residual coal from wide coal pillar |
WO2016112771A1 (en) * | 2015-01-14 | 2016-07-21 | 中国矿业大学 | Complete non-coal-pillar continuous depressurized mining method for short-distance coal seam group |
CN104806246A (en) * | 2015-05-08 | 2015-07-29 | 贵州盘江精煤股份有限公司 | Gob-side entry retaining method for coal mine gateway by directional-predetermined crack blasting and truncating crest and pressure relief mode |
CN105065001A (en) * | 2015-07-31 | 2015-11-18 | 中国矿业大学(北京) | Gob-side entrydriving mining method of ultralong-propulsion-distance working face |
CN106437713A (en) * | 2016-10-21 | 2017-02-22 | 山东科技大学 | Automatic coal feeding apparatus for fully mechanized coal face and coal feeding process recognition method |
CN106522952A (en) * | 2016-12-26 | 2017-03-22 | 山东科技大学 | Upper corner treatment method for large-dip-angle mining work face |
CN106522952B (en) * | 2016-12-26 | 2018-06-29 | 山东科技大学 | A kind of upper corner processing method of high inclination-angle exploitation working face |
CN107013216A (en) * | 2017-05-16 | 2017-08-04 | 中国科学院武汉岩土力学研究所 | A kind of colliery deep mining impulsion pressure prevention and controls |
AU2019456662B2 (en) * | 2019-07-09 | 2022-06-09 | Beijing Zhongkuang Innovation Alliance Energy Environment Science Academy | Design method for mine without leaving coal pillar and without roadway tunneling |
CN110130898B (en) * | 2019-07-09 | 2019-09-17 | 北京中矿创新联盟能源环境科学研究院 | Design method for non-pillar, non-roadway and non-roadway tunneling mine |
WO2021003771A1 (en) * | 2019-07-09 | 2021-01-14 | 北京中矿创新联盟能源环境科学研究院 | Design method for mine without leaving coal pillar and without roadway tunneling |
WO2021003772A1 (en) * | 2019-07-09 | 2021-01-14 | 北京中矿创新联盟能源环境科学研究院 | Method for coal mining without reserving coal pillar and tunneling roadway in whole mining area |
CN110130898A (en) * | 2019-07-09 | 2019-08-16 | 北京中矿创新联盟能源环境科学研究院 | Design method for non-pillar, non-roadway and non-roadway tunneling mine |
AU2019456486B2 (en) * | 2019-07-09 | 2022-06-30 | Beijing Zhongkuang Innovation Alliance Energy Environment Science Academy | Method for coal mining without reserving coal pillar and tunneling roadway in whole mining area |
US11578597B2 (en) | 2019-07-09 | 2023-02-14 | Beijing Zhongkuang Innovation Alliance Energy Environment Science Academy | Underground longwall mining method |
US11578598B2 (en) | 2019-07-09 | 2023-02-14 | Beijing Zhongkuang Innovation Alliance Energy Environment Science Academy | Method for coal mining without reserving coal pillar and tunneling roadway in whole mining area |
CN110984987A (en) * | 2019-12-23 | 2020-04-10 | 西安科技大学 | Large-inclination-angle coal seam working face local filling pillar-free mining method and system |
CN110984987B (en) * | 2019-12-23 | 2021-04-30 | 西安科技大学 | Large-inclination-angle coal seam working face local filling pillar-free mining method and system |
CN114278293A (en) * | 2021-12-03 | 2022-04-05 | 天地科技股份有限公司 | Method for cutting top of coal seam roof |
CN114278293B (en) * | 2021-12-03 | 2024-05-03 | 天地科技股份有限公司 | Roof cutting method for coal seam roof |
Also Published As
Publication number | Publication date |
---|---|
EP2801697A4 (en) | 2015-12-23 |
EP2801697B1 (en) | 2019-08-14 |
WO2013102309A1 (en) | 2013-07-11 |
PL2801697T3 (en) | 2020-06-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2801697B1 (en) | Longwall working face, non-pillared mining method | |
CN102536239B (en) | Long-wall working face coal pillar-free mining method | |
CN104763432B (en) | A kind of method that high stress tunnel country rock release controls large deformation | |
CN102226405B (en) | Method for reinforcing working surface of loose and soft coal bed by utilizing nonmetal grouting anchor cable | |
CN113914862B (en) | Roof-cutting pressure-relief coal-pillar-free self-entry mining design and evaluation method | |
CN110966002B (en) | Roof cutting pressure relief method based on intensive drilling | |
CN103032086A (en) | Method for filling resin explosive cartridge in drilled hole of tunnel roof anchor rod | |
CN111535817A (en) | Working face double-lane tunneling small coal pillar reinforcement construction method | |
CN109779663B (en) | Gob-side entry retaining partition cooperative control method | |
CN115749713A (en) | Rock stratum frequency conversion pulse fracture network fracturing method and equipment | |
CN108386193A (en) | A kind of hard integrality top plate chemically expansible pressure break pressure relief method in end | |
CN103216264A (en) | Method for controlling deformation of surrounding rock of basic rimrock layer on presplitting blasting mining roadway | |
CN112922598A (en) | Method for reducing gob-side entry driving roof pressure through roof cutting and pressure relief | |
CN112983418A (en) | Method for hydraulic fracturing pressure relief of coal mine underground coal face withdrawal channel | |
CN103216265B (en) | A kind of high stress tunnel surrouding rock deformation control method | |
CN113605893A (en) | Control method for pre-filled completely gob-side entry driving surrounding rock | |
CN103233739A (en) | Mining method for thick and large ore pillar under filling body package | |
CN210070765U (en) | Deformable folding portable quick charging energy-gathering device | |
CN110552731A (en) | top coal caving stoping roadway grouting anchor cable supporting structure and advanced supporting method thereof | |
Lin | Study of soft rock roadway support technique | |
CN110145363B (en) | Roof control method for realizing transition from fully mechanized mining face caving to filling mining | |
CN103498679B (en) | Filling and support synchronous mode prevention top board abnormal next press comprehensively put coal-mining method | |
CN204371383U (en) | A set of glass fibre reinforced plastics rockbolts controls the ruggedized construction of high working face coal wall caving | |
CN217681856U (en) | Simple device for measuring deformation of coal seam roof rock stratum | |
CN111322072B (en) | Active support non-forced roof cutting gob-side entry retaining method under close-distance coal seam goaf |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20140805 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAX | Request for extension of the european patent (deleted) | ||
RA4 | Supplementary search report drawn up and despatched (corrected) |
Effective date: 20151119 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: E21C 41/16 20060101AFI20151113BHEP Ipc: E21C 41/18 20060101ALI20151113BHEP |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20171219 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20190319 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP Ref country code: AT Ref legal event code: REF Ref document number: 1167258 Country of ref document: AT Kind code of ref document: T Effective date: 20190815 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602012063021 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20190814 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20191216 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20191114 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20191114 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1167258 Country of ref document: AT Kind code of ref document: T Effective date: 20190814 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20191115 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20191214 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20200224 Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602012063021 Country of ref document: DE |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG2D | Information on lapse in contracting state deleted |
Ref country code: IS |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602012063021 Country of ref document: DE |
|
26N | No opposition filed |
Effective date: 20200603 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20200131 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200106 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200801 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200131 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200131 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200131 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200106 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190814 |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230529 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20240125 Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: PL Payment date: 20240129 Year of fee payment: 13 Ref country code: FR Payment date: 20240123 Year of fee payment: 13 |