CN210660136U - Soft thick coal seam working face tunnel advance canopy guard supporting construction - Google Patents
Soft thick coal seam working face tunnel advance canopy guard supporting construction Download PDFInfo
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- CN210660136U CN210660136U CN201921621353.8U CN201921621353U CN210660136U CN 210660136 U CN210660136 U CN 210660136U CN 201921621353 U CN201921621353 U CN 201921621353U CN 210660136 U CN210660136 U CN 210660136U
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- roadway
- grouting
- working face
- coal seam
- supporting structure
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- 239000003245 coal Substances 0.000 title claims abstract description 59
- 238000010276 construction Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 238000005065 mining Methods 0.000 claims abstract description 12
- 239000011440 grout Substances 0.000 claims description 17
- 239000002023 wood Substances 0.000 claims description 4
- 238000007569 slipcasting Methods 0.000 abstract description 25
- 238000005553 drilling Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 9
- 230000004087 circulation Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 17
- 239000004115 Sodium Silicate Substances 0.000 description 15
- 239000004568 cement Substances 0.000 description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 15
- 229910052911 sodium silicate Inorganic materials 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 102000008133 Iron-Binding Proteins Human genes 0.000 description 2
- 108010035210 Iron-Binding Proteins Proteins 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The utility model relates to a soft thick coal seam working face tunnel advance top protection supporting construction, include a plurality of shoring circulations along the tunnel exploitation construction, every shoring circulation includes four canopy U shaped steels that set up along the tunnel exploitation direction interval and along the tunnel U shaped steel that heads on towards a plurality of slip casting drilling that the interval slope set up towards tunnel roof coal seam, all is provided with the slip casting stock in every slip casting drilling, has laid the polylith wire netting between along the sectional U shaped steel in tunnel and the tunnel coal wall, and the overlap joint sets up between two adjacent wire netting. The working face roadway advanced roof protection supporting structure is simple in process flow, workers are easy to operate and construct, the progress of roadway mining construction is guaranteed, the strength of the working face roadway coal seam roof can be effectively controlled, safety accidents or casualty accidents of collapse or roof collapse of the working face roadway coal seam roof are reduced, U-shaped steel after the working face roadway is mined can be recycled, and the production and management cost of a coal mine is reduced.
Description
Technical Field
The utility model belongs to the technical field of colliery working face tunnel is strutted, especially relate to a soft thick seam working face tunnel advance canopy guard supporting construction.
Background
Coal mining belongs to underground engineering, and because the coal burial depth is large and the coal is under the action of large ground stress, a roadway must be supported in the coal mining process, otherwise, the safety accident or casualty accident of collapse or roof fall of the roadway roof is easily caused. Particularly, for the roadway roof of a soft and thick coal seam, the supporting difficulty of the roof is higher, and the existing roof supporting structure adopting the anchor rod and anchor cable combined support cannot effectively control the strength of the roof, cannot recycle the anchor rod and anchor cable, is too high in supporting cost, increases the operating cost of a coal mine, and is complex in construction process of the anchor rod and anchor cable, so that the mining construction progress of the roadway is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a soft thick coal seam working face tunnel advance canopy guard supporting construction has solved current working face tunnel roof supporting construction insecure, and the incident of collapse or roof fall easily appears in the roof.
In order to solve the technical problem, the utility model provides a soft thick coal seam working face tunnel advance top protection supporting construction, include a plurality of support circulation along the tunnel exploitation construction, every support circulation includes four canopy U shaped steel that set up along the tunnel exploitation direction interval and a plurality of slip casting drilling that set up towards tunnel roof coal seam interval tilt up along tunnel meeting U shaped steel, all be provided with the slip casting stock in every slip casting drilling, laid the polylith wire netting between U shaped steel and the tunnel coal wall along the tunnel section, the overlap joint sets up between two adjacent wire netting, wherein the interval between two adjacent U shaped steel is H, H is 500 millimeters ~ 700 millimeters, interval between two adjacent slip casting stocks is H, H is 180 millimeters ~ 240 millimeters, the contained angle between slip casting stock and the horizontal direction is 3 ~ 5, the lapped width between two adjacent wire netting is L, L is 200 millimeters, U shaped steel includes the leg that U type arched girder and symmetry set up, hold in place fixed connection through the card between U type arched girder and the leg, the slip casting stock is connected with the slip casting stock in the tunnel bottom of the slip casting stock bottom, the slip casting stock is equipped with slip casting stock in the slip casting stock bottom dish on 356 thick liquid dish, the slip casting stock is equipped with slip casting stock and is connected with the slip casting stock on the slip casting stock dish, the slip casting stock is connected with the screw thread dish on the slip casting stock, the slip casting dish is connected with the screw thread dish is connected with the slip casting dish on the anchor stock, the.
The ratio of the length of the grout stopping plug to the length of the skeleton anchor rod is 1: 9-1: 8.
the grout stopping plug is made of rubber.
The diameter of the grouting drill hole is D, and the outer diameter of the grout stopping plug is D, wherein D < D.
The diameter D of the grouting drill hole is 42 mm, and the outer diameter D of the grout stopping plug is 45 mm.
The distance H between two adjacent U-shaped steels is 600 millimeters.
The distance h between two adjacent grouting anchor rods is 200 mm.
And wood wedges are filled in gaps between the column legs and the coal wall of the roadway.
The included angle β between slip casting stock and the horizontal direction is 5 degrees, and the included angle α between the column leg and the vertical direction is 8 degrees.
A supporting method for roadway advanced roof protection of a soft thick coal seam working face comprises the following steps:
the first step is as follows: erecting U-shaped steel;
according to the supporting design of the U-shaped steel, column leg sockets are excavated at the calibrated positions according to the designed depth and angle, column legs of the U-shaped steel are buried in the column leg sockets, the U-shaped arched beams are fixedly connected with the column legs by clamping cables, and gaps between the column legs and the coal wall of the roadway are filled with wood wedge blocks so as to increase the interaction force between the U-shaped steel column legs and the coal wall of the roadway.
The second step is that: laying a wire mesh;
and laying iron wires between the U-shaped steel and the coal wall of the roadway, overlapping two adjacent iron wires by 200 mm, screwing the two adjacent iron wires by using iron binding wires, wherein the mesh size of the steel wire mesh is 50 mm by 50 mm, so that the loose and broken coal blocks on the coal wall of the roadway are prevented from falling off and hitting pedestrians.
The third step: grouting and drilling;
after the U-shaped steel of one supporting circulation is erected, grouting and drilling are conducted from the U-shaped steel at the head of each supporting circulation roadway to the coal seam of the roadway roof by utilizing a pneumatic anchor rod drilling machine according to the designed depth and angle at the calibrated position, and the drilling bit is a diamond bit with the diameter of 42 mm in the construction process.
The fourth step: mounting a grouting anchor rod;
and (3) connecting the grout stop plug on the framework anchor rod in a threaded manner, filling the head end of the framework anchor rod into the grouting drill hole, knocking the tail end of the framework anchor rod by using a sledge hammer, stopping until the length of the exposed grouting drill hole of the framework anchor rod is 200 mm, sleeving the anchor rod tray on the framework anchor rod, connecting the anchor rod nut in a threaded manner on the framework anchor rod outside the anchor rod tray, and fastening the anchor rod nut by using a stress wrench.
The fifth step: pre-grouting and re-grouting filling of a working face roadway advance coal seam roof;
the quick joint of a grouting pipeline is inserted at the tail part of a grouting anchor rod, the prepared mixed grouting liquid of 425# cement and sodium silicate is injected into a grouting drill hole through the grouting anchor rod by adopting an electric grouting pump, and the proportion of the mixed grouting liquid is 425# cement under the common condition: sodium silicate: water ═ 0.5: 0.3: the method comprises the following steps of 1, adopting a mode of simultaneously grouting by a plurality of grouting drill holes during grouting, setting the grouting pressure of an electric grouting pump to be 2MPa, wherein the grouting construction in the step comprises pre-grouting and secondary grouting, and setting the time interval between the pre-grouting and the secondary grouting to be 1-2 hours, so that the saturation pressure of the roadway of the working face before the grouting of the coal seam roof reaches 1 MPa.
And a sixth step: and circularly supporting and constructing the advanced top protection of the roadway on the working face according to the previous steps.
The utility model has the advantages that: the working face roadway advanced roof protection supporting structure is simple in process flow, workers can easily operate and construct, the progress of roadway mining construction is guaranteed, the advanced roof protection supporting structure can effectively control the strength of the coal seam roof of the working face roadway, safety accidents or casualty accidents of collapse or roof fall of the coal seam roof of the working face roadway are reduced, U-shaped steel after the working face roadway is mined can be recycled, and the production and management cost of a coal mine is reduced.
Drawings
FIG. 1 is a schematic structural view of U-shaped steel and a working face roadway of the utility model;
fig. 2 is a schematic plane structure diagram of a working face roadway advanced canopy supporting structure in the embodiment of the utility model;
fig. 3 is a schematic sectional structure view of a working face roadway advanced canopy guard supporting structure in the embodiment of the utility model;
fig. 4 is a schematic structural view of a grouting anchor rod and a grouting drill hole in the embodiment of the invention;
fig. 5 is the embodiment of the utility model provides an observation station tunnel roof deflection contrast sketch map under former supporting construction and the design supporting construction.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 3, the utility model provides a soft thick coal seam working face roadway advanced roof protection supporting structure, which comprises a plurality of supporting cycles along roadway mining construction, each supporting cycle comprises four shed U-shaped steel 1 arranged at intervals along the roadway mining direction and a plurality of grouting drill holes 2 arranged at intervals and obliquely upwards towards a roadway roof coal seam along the roadway head-on U-shaped steel 1, each grouting drill hole 2 is internally provided with a grouting anchor rod 3, a plurality of wire netting 5 are laid between the U-shaped steel 1 and a roadway coal wall 4 along the roadway section, two adjacent wire netting 5 are arranged in a lap joint mode, the distance between two adjacent U-shaped steel 1 is H, H is 500-700 mm, in the embodiment, H is 600 mm, the distance between two adjacent grouting anchor rods 3 is H, H is 180-240 mm, in the embodiment, H is 200 mm, in the embodiment, the values of H and column H can be properly adjusted according to the crushing condition of the working face roadway roof, when the working face roadway roof is more complete, the values of H and H can be properly adjusted, when the working face of the roadway working face is equal to the roadway working face, the angle between H and the roadway leg is equal to the angle between the L102, the L-102, the angle between the L-102 is equal to the L-102 angle between the L-3, when the working face of the U-column angle between the U-column is equal to the angle between the U-column angle of the U-102, the U-column angle is equal to the angle of the angle between the L-column 102, the angle between the angle is equal to 10 mm, the angle of the.
As shown in fig. 4, the grouting anchor rod 3 includes a hollow skeleton anchor rod 301, a grout stop plug 302 is connected to the skeleton anchor rod 301 in the grouting drill hole 2 in a threaded manner, the grout stop plug 302 is made of rubber, and the grout stop plug 302 can be tightly attached to the hole wall of the grouting drill hole 2 by using the telescopic deformation characteristic of rubber, so that the grouting effect is ensured. Grouting liquid 303 is arranged between the grout stop plug 302 and the bottom of the grouting drill hole 2, the grouting liquid 303 is formed by mixing 425# cement and sodium silicate, and the proportion of the grouting liquid 303 is generally 425# cement: sodium silicate: water ═ 0.5: 0.3: 1, the proportion of the grouting liquid 303 can be simply adjusted according to the grouting or slurry running condition in the actual grouting process, namely, when the slurry running phenomenon is serious, the use amounts of 425# cement and sodium silicate are increased, and the proportion of the grouting liquid 303 is 425# cement: sodium silicate: water ═ 0.7: 0.4: 1; when grouting is difficult, the dosage of 425# cement and sodium silicate is reduced, and the mixture ratio of the grouting liquid 303 is 425# cement: sodium silicate: water ═ 0.4: 0.2: 1. the cover is equipped with stock tray 304 on the skeleton stock 301 that exposes and grout drilling 2 outside, and threaded connection has stock nut 305 on the skeleton stock 301 outside stock tray 304, and wherein the length of only thick liquid stopper 302 and the length of skeleton stock 301 between account for the proportion is 1: 9-1: 8, the diameter of the grouting drill hole 2 is D, the outer diameter of the grout stop plug 302 is D, wherein D < D, in this embodiment, the depth of the grouting drill hole 2 is 3500 mm, the length of the framework anchor rod 301 is 3300 mm, the length of the grout stop plug 302 is 400 mm, the diameter D of the grouting drill hole 2 is 42 mm, and the outer diameter D of the grout stop plug 302 is 45 mm.
The arrows in fig. 2 and 3 point in the direction of face roadway mining.
A supporting method for roadway advanced roof protection of a soft thick coal seam working face comprises the following steps:
the first step is as follows: erecting the U-shaped steel 1;
according to the supporting design of the U-shaped steel 1, leg sockets of the column legs 102 are excavated at the calibrated position according to the designed depth and angle, the column legs 102 of the U-shaped steel 1 are embedded in the leg sockets of the column legs 102, the U-shaped arched beam 101 is fixedly connected with the column legs 102 through clamping cables 103, and gaps between the column legs 102 and the roadway coal wall 4 are filled with wood wedges 6 so as to increase the interaction force between the column legs 102 of the U-shaped steel 1 and the roadway coal wall 4.
The second step is that: laying the iron wire net 5;
the wire netting 5 is laid between the U-shaped steel 1 and the roadway coal wall 4, 200 mm is lapped between two adjacent wire netting 5, the two adjacent wire netting 5 are tightly screwed by iron binding wires, and the mesh size of the steel wire net is 50 mm x 50 mm, so that loose and broken coal blocks on the roadway coal wall 4 are prevented from falling off and hitting pedestrians.
The third step: constructing a grouting drill hole 2;
after the U-shaped steel 1 of one supporting circulation is erected, according to the design of a grouting drill hole 2, the grouting drill hole 2 is constructed from the U-shaped steel 1 at the head of each supporting circulation roadway to the coal seam of the roadway roof by using a pneumatic anchor rod drilling machine according to the designed depth and angle, and the drill bit is a diamond drill bit with the diameter of 42 mm in the construction process.
The fourth step: mounting a grouting anchor rod 3;
stop thick liquid stopper 302 threaded connection on skeleton stock 301 to fill in the slip casting drilling 2 with the head end of skeleton stock 301, then utilize the sledgehammer to strike the tail end of skeleton stock 301, stop when skeleton stock 301 exposes the length of slip casting drilling 2 and is 200 millimeters, establish on skeleton stock 301 with stock tray 304 cover, then on the skeleton stock 301 in the stock tray 304 outside with stock nut 305 threaded connection, utilize the stress wrench to fasten stock nut 305.
The fifth step: pre-grouting and re-grouting filling of a working face roadway advance coal seam roof;
the quick joint of a grouting pipeline is inserted at the tail part of a grouting anchor rod 3, the prepared mixed grouting liquid 303 of 425# cement and sodium silicate is injected into a grouting drill hole 2 through the grouting anchor rod 3 by adopting an electric grouting pump, the grouting liquid 303 is formed by mixing the 425# cement and the sodium silicate, and the proportion of the grouting liquid 303 is generally 425# cement: sodium silicate: water ═ 0.5: 0.3: 1, the proportion of the grouting liquid 303 can be simply adjusted according to the grouting or slurry running condition in the actual grouting process, namely, when the slurry running phenomenon is serious, the use amounts of 425# cement and sodium silicate are increased, and the proportion of the grouting liquid 303 is 425# cement: sodium silicate: water ═ 0.7: 0.4: 1; when grouting is difficult, the dosage of 425# cement and sodium silicate is reduced, and the mixture ratio of the grouting liquid 303 is 425# cement: sodium silicate: water ═ 0.4: 0.2: 1. and during grouting, a mode that a plurality of grouting drill holes 2 are simultaneously grouted is adopted, the grouting pressure of the electric grouting pump is set to be 2MPa, grouting construction in the step comprises pre-grouting and secondary grouting, and the time interval between the pre-grouting and the secondary grouting is set to be 1-2 hours, so that the saturation pressure of the working face roadway ahead of the coal seam roof grouting reaches 1 MPa.
And a sixth step: and circularly supporting and constructing the advanced top protection of the roadway on the working face according to the previous steps.
The supporting structure is constructed on a working face of a III 811 west wind tunnel of a Lurging mountain coal mine of Huaibei mining industry group by 300 meters in length, six tunnel roof deformation observation points are arranged at intervals of 50 meters in an experimental tunnel section, six tunnel roof deformation observation points are also arranged at intervals of 50 meters in a non-experimental tunnel section, and the tunnel roof deformation of the 12 observation points is observed and recorded at regular time, wherein the maximum deformation recording data of a roof of an original supporting structure and a roof of a designed supporting structure are shown in a table 1, and the roof deformation conditions of the original supporting structure and the roof of the designed supporting structure are shown in a figure 5.
TABLE 1 maximum deformation recording table for top plate of original supporting structure and designed supporting structure
The deformation of the top plate of the roadway is obviously better than the deformation of the top plate of the roadway controlled by the original supporting structure, and the maximum deformation of the top plate of the roadway controlled by the advanced top protection supporting structure of the designed working face roadway and the maximum deformation of the top plate of the roadway controlled by the original supporting structure are reduced by about 300 mm. In addition, the process flow of the designed advanced top protection supporting structure for the roadway of the working face is simple, workers can easily operate and construct, the progress of roadway mining construction is guaranteed, the strength of the coal seam roof of the roadway of the working face can be effectively controlled, safety accidents or casualty accidents of collapse or roof fall of the coal seam roof of the roadway of the working face are reduced, the U-shaped steel 1 after the roadway of the working face is mined can be recycled, and the production and management cost of a coal mine is reduced.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but rather is described in the embodiments and descriptions herein to illustrate the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, all of which fall within the scope of the claimed invention.
Claims (9)
1. A roadway advanced roof protection supporting structure of a soft thick coal seam working face comprises a plurality of supporting cycles of roadway mining construction, and is characterized in that each supporting cycle comprises four shed U-shaped steels arranged at intervals along a roadway mining direction and a plurality of grouting drill holes arranged at intervals along a roadway head-on U-shaped steel and inclined upwards towards a roadway roof coal seam, a grouting anchor rod is arranged in each grouting drill hole, a plurality of wire nets are laid between the U-shaped steel along a roadway section and a roadway coal wall, the adjacent two wire nets are arranged in a lap joint mode, the distance between the two adjacent U-shaped steels is H, the H is 500-700 mm, the distance between the two adjacent grouting anchor rods is H, the H is 180-240 mm, the included angle between the grouting anchor rod and the horizontal direction is 3-5 degrees, the lap joint width between the two adjacent wire nets is L, the L is 200 mm, the U-shaped steel comprises a U-shaped arch beam and symmetrically arranged hollow column legs, the U-shaped arch beam and the column legs are fixedly connected through clamping cables, the inclined downwards of the column legs in the roadway, the grouting anchor rod is arranged between the bottom plate of the roadway, the vertical grouting anchor rod and the column plug is arranged in the grouting hole, and the vertical grouting support plug is arranged on the column skeleton, and the column plug arranged on the column tray, and the grouting anchor rod, and the column plug is 356-shaped bolt, and the column plug is arranged in the grouting bolt, and the grouting bolt hole, and the bolt hole.
2. The roadway advanced roof protection supporting structure for the soft thick coal seam working face according to claim 1, characterized in that: the ratio of the length of the grout stopping plug to the length of the skeleton anchor rod is 1: 9-1: 8.
3. the roadway advanced roof protection supporting structure for the soft thick coal seam working face as claimed in claim 2, wherein: the grout stopping plug is made of rubber.
4. The roadway advanced roof protection supporting structure for the soft thick coal seam working face as claimed in claim 3, wherein: the diameter of the grouting drill hole is D, and the outer diameter of the grout stopping plug is D, wherein D < D.
5. The roadway advanced roof protection supporting structure for the soft thick coal seam working face as claimed in claim 4, wherein: the diameter D of the grouting drill hole is 42 mm, and the outer diameter D of the grout stopping plug is 45 mm.
6. The roadway advanced roof protection supporting structure for the soft thick coal seam working face according to claim 1, characterized in that: the distance H between two adjacent U-shaped steels is 600 millimeters.
7. The roadway advanced roof protection supporting structure for the soft thick coal seam working face according to claim 1, characterized in that: the distance h between two adjacent grouting anchor rods is 200 mm.
8. The roadway advanced roof protection supporting structure for the soft thick coal seam working face according to claim 1, characterized in that: and wood wedges are filled in gaps between the column legs and the coal wall of the roadway.
9. The advancing roof protection and supporting structure of the soft and thick coal seam working face roadway is characterized in that an included angle β between the grouting anchor rod and the horizontal direction is 5 degrees, and an included angle α between the column leg and the vertical direction is 8 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921621353.8U CN210660136U (en) | 2019-09-26 | 2019-09-26 | Soft thick coal seam working face tunnel advance canopy guard supporting construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921621353.8U CN210660136U (en) | 2019-09-26 | 2019-09-26 | Soft thick coal seam working face tunnel advance canopy guard supporting construction |
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| Publication Number | Publication Date |
|---|---|
| CN210660136U true CN210660136U (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921621353.8U Expired - Fee Related CN210660136U (en) | 2019-09-26 | 2019-09-26 | Soft thick coal seam working face tunnel advance canopy guard supporting construction |
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| CN (1) | CN210660136U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513129A (en) * | 2019-09-26 | 2019-11-29 | 黄祖军 | A kind of advanced roof protection support structure and support method of roadway in soft thick coal seam working face |
-
2019
- 2019-09-26 CN CN201921621353.8U patent/CN210660136U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513129A (en) * | 2019-09-26 | 2019-11-29 | 黄祖军 | A kind of advanced roof protection support structure and support method of roadway in soft thick coal seam working face |
| CN110513129B (en) * | 2019-09-26 | 2024-04-02 | 黄祖军 | Advanced roof-protecting supporting structure and method for roadway of soft and thick coal seam working face |
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Granted publication date: 20200602 Termination date: 20200926 |