CN213360180U - Side roadway side wall plugging prefabricated part for roof cutting roadway mining area of high-gas mine - Google Patents
Side roadway side wall plugging prefabricated part for roof cutting roadway mining area of high-gas mine Download PDFInfo
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- CN213360180U CN213360180U CN202022045604.1U CN202022045604U CN213360180U CN 213360180 U CN213360180 U CN 213360180U CN 202022045604 U CN202022045604 U CN 202022045604U CN 213360180 U CN213360180 U CN 213360180U
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Abstract
The utility model relates to a colliery cut-top becomes lane exploitation technical field, specifically is a side lane group shutoff prefab and application method of high gas mine cut-top becomes lane gob side. The problem of there is the work progress complicacy in the current shutoff technical measure of solution, plugging material yielding, can't realize the effective isolated problem in collecting space area and return air tunnel, including inlayer steel mesh, the cloth that keeps out the wind, outer steel mesh, centre gripping area and mounting, the cloth that keeps out the wind presss from both sides between inlayer steel mesh and outer steel mesh, and it is fixed through centre gripping area and mounting, the cloth that keeps out the wind realizes sealedly through prevention of seepage cementation sealing coating with the junction of inlayer steel mesh and outer steel mesh, the whole surface spraying sealing coating of cloth and the contact of outer steel mesh that keeps out the wind, the welding of U shaped steel bottom has the connection base. The utility model discloses can realize that the high gas mine is easy from the improvement of coal-fired layer surely top roadway side lane group shutoff technical measure, both prevent the tunnel to goaf air leakage, can prevent again that the gas in the goaf from leaking to the return airway.
Description
Technical Field
The utility model relates to a colliery cut-top becomes lane exploitation technical field, specifically is a shutoff prefab is helped in side lane of high gas mine cut-top becomes lane goaf-side lane.
Background
With the development and application of the roof-cutting roadway-forming coal-pillar-free mining technology, the ventilation mode of the working face is changed from a U shape to a Y shape, and the problem of gas accumulation at the upper corner of the working face of a high-gas mine is effectively solved. However, due to the blasting process, the anisotropy of rock mass and other reasons, after roof rocks are cut down, a plurality of communicated holes and gaps with different sizes exist between the return airway and the gob, which are formed by scattered rock blocks, so that gas in the gob leaks seriously to the return airway, and the difficulty in controlling the gas in the return airway is greatly increased; meanwhile, the air leakage from the air return roadway to the goaf is serious due to the fact that the holes and the gaps are communicated, and the spontaneous combustion risk of residual coal in the goaf is increased. Therefore, the effective plugging of the side roadway side of the roof cutting roadway mining area in the process of mining the coal bed of the high-gas mine is of great significance.
At present, the technical measures adopted by the goaf of the Y-shaped ventilation working face are mainly void grouting or guniting, partition wall building, air curtain suspension and the like. The gap grouting or spraying technology mainly uses slurry materials to fill or spray large gaps of the crushed coal rock mass in the goaf; the technology of building the isolation wall is to build a closed wall at the air inlet end and the air return end of the goaf to separate an air leakage channel or increase air leakage resistance; the suspended wind curtain technology is that a distance of wind curtains are arranged at the corners of wind inlets to increase the wind leakage resistance. In addition, the air leakage prevention technology has a pressure equalizing measure, and the technology changes the pressure gradient of a goaf or a working surface mainly through an adjusting device, so that the pressure difference at two sides of an air leakage channel is reduced, and the air leakage is reduced.
However, the above mentioned plugging technique has some disadvantages: (1) the construction processes of grouting, masonry and the like are complex, the construction period is long, and the construction difficulty under a coal mine is high; (2) the plugging material is easy to deform and crack, and cannot effectively plug air leakage and gas leakage channels and effectively isolate a goaf from a return airway.
Disclosure of Invention
The utility model discloses a solve current shutoff technical measure and have that the work progress is complicated, plugging material yielding, can't realize the effective isolated problem in collecting space area and return airway, provide a shutoff prefab is helped in high gas mine roof cutting roadway goaf side lane.
The utility model adopts the following technical proposal: the utility model provides a prefab of shutoff of lane group is moved to high gas mine roof cutting roadway goaf side, includes inlayer steel mesh, wind-blocking cloth, outer steel mesh, holding belt and mounting, and wind-blocking cloth presss from both sides between inlayer steel mesh and outer steel mesh to it is fixed through holding belt and mounting, and wind-blocking cloth realizes sealedly through prevention of seepage cementation sealing coating with the junction of inlayer steel mesh and outer steel mesh, and wind-blocking cloth and the whole surface spraying sealing coating of outer steel mesh contact, and the welding of U shaped steel bottom has the connection base.
Further, the inner layer steel mesh is a steel mesh facing the goaf side, the width of the inner layer steel mesh is 1.5m, the height of the inner layer steel mesh is consistent with the height of a roadway of a working face roof cutting roadway, the wire diameter of the inner layer steel mesh is 6mm, the mesh shape of the inner layer steel mesh is square, and the side length of the mesh is 10 cm.
Furthermore, the wind screen cloth is woven by high-strength polyester glass fiber to form a coating base cloth, and the flame-retardant antistatic soft PVC is modified to be used as a surface film, so that the wind screen cloth which is effectively combined with the high-technology surface film, is flame-retardant, antistatic, high in strength, folding-resistant and long in service life is formed. The thickness of the wind-blocking cloth is 0.8mm, the upper end of the wind-blocking cloth is reserved with 400mm, the left side of the wind-blocking cloth is reserved with 300mm of length, and the right side and the lower end of the wind-blocking cloth are correspondingly overlapped with the right side and the lower end of the inner steel mesh.
Further, the steel mesh of outer steel mesh finger face to the tunnel side, the silk footpath of outer steel mesh is 4mm, the mesh shape of outer steel mesh is the rhombus, the length of side of rhombus is 4cm, the interior angle is 60 and 120, the left side of outer steel mesh, the right side, the lower extreme all with the left side of inlayer steel mesh, right side and lower extreme correspond the coincidence, length 400mm is reserved to the upper end of outer steel mesh, the steel mesh that the outer steel mesh upper end was reserved turns over to the tunnel and rolls over 90, the fender wind cloth that the fender wind cloth upper end was reserved pastes the steel mesh that tight outer steel mesh upper end was reserved.
Further, the clamping belt is of a strip-shaped structure, the clamping belt is arranged into an upper pair and a lower pair, the clamping belt is respectively and transversely symmetrically arranged on two sides of the inner-layer steel mesh and the outer-layer steel mesh, the material of the clamping belt is flame-retardant and antistatic whole core PVG, the length of the clamping belt is the same as the width of the inner-layer steel mesh, the width of the clamping belt is 90mm, and drilling holes are drilled at two ends of the clamping belt.
Further, the mounting is bolt and nut, and the bolt is fixed with inlayer steel mesh, windshield cloth and outer steel mesh through the drilling of holding area with the nut, and the junction of mounting and holding area and mounting penetrate behind the windshield cloth and the contact position spraying of windshield cloth have sealing paint, the whole surface spraying thickness of windshield cloth and outer steel mesh contact be 2~3 mm's prevention of seepage cementation sealing paint to increase the ductility and the toughness of windshield cloth, and increase the tensile strength of prefab.
Further, the seepage-proofing cementing sealing coating is polyurethane bi-component coating, the coating is prepared by the reaction of 310 parts of diphenylmethane diisocyanate (MDI), 530 parts of polyether 220 and 160 parts of polyether 3050, the prepared isocyanate-terminated semi-prepolymer is a component A, consists of 100 parts of 3,3 '-dichloro-4, 4' -diaminodiphenylmethane (MOCA) and 140 parts of polyether 3050, and 400 parts of talcum powder, 30 parts of flame retardant and 330 parts of chlorinated paraffin are added as a component B of curing agent; when the coating is used, A: B =1:2, the tensile strength of the coating after curing is 6MPa, the elongation at break is 450%, and the oxygen index is more than 30.
The length of U shaped steel is longer than the height 150mm of roof cutting roadway mining area side tunnel, and the connection base is the rectangle steel sheet, and thickness is 10 mm.
The utility model provides a method of using of prefabricated part of high gas mine roof cutting roadway goaf side lane group shutoff, accomplish the preparation of prefabricated part on the pit, will keep out the wind and arrange in the middle of inlayer steel mesh and outer steel mesh, and clip with the holding band, drill hole at the holding band both ends, and fix with the mounting, thereby closely laminate inlayer steel mesh, wind-blocking cloth and outer steel mesh into a whole, and at mounting and holding band and wind-blocking cloth contact department spraying prevention of seepage cementation sealing coating, in order to prevent to lead to wind-blocking cloth at drilling department because the installation of mounting leaks out. And conveying the prefabricated member and the U-shaped steel connected with the base to the underground to install the prefabricated member. With the stoping of a working face, roof cutting and roadway retaining are formed, a roadway forming stable area is reserved behind the working face, a prefabricated part is erected on one side of a goaf of the roadway, an inner steel mesh of the prefabricated part is tightly attached to a roadway side, an outer steel mesh faces the interior of the roadway, the upper end of the prefabricated part is tightly attached to a top plate, two U-shaped steels are adopted to prop two ends of an outer steel mesh which is reserved at the upper end of the prefabricated part and is turned over for 90 degrees and wind-blocking cloth, the U-shaped steels are tightly attached to the outer steel mesh, the distance between the two U-shaped steels is 0.75m, and a base of the U-shaped steels is required to fall; and (3) next, installing a next group of prefabricated parts close to the left sides of the installed prefabricated parts in the same way, pressing the wind-blocking cloth reserved on the left side of the previous prefabricated part on the right side of the next group of prefabricated parts, uniformly spraying the connecting parts of the two prefabricated parts by adopting the sealing coating, wherein the spraying thickness is 2-3 mm, and sequentially installing the prefabricated parts along with the stoping progress and the roadway forming length of the working face according to the method to form a blocking wall for blocking the gas circulation between the goaf and the return airway.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a pair of prefab of shutoff is helped to high gas mine roof cutting roadway goaf side lane can realize that high gas mine is easy from the improvement of coal-fired layer roof cutting roadway goaf side lane shutoff technical measure to effectively completely cut off the gas UNICOM between goaf and the return airway, both prevent the tunnel to goaf air leakage, reduce the danger that goaf left coal spontaneous combustion was fired, can prevent gas leakage in the goaf again to the return airway, the safe high-efficient stoping of guarantee working face.
The utility model provides a pair of prefab of shutoff is helped in high gas mine roof cutting roadway goaf side lane can realize carrying out the preparation of prefab in the pit to the place of operation of leaking stoppage in the pit is transported easily, only need accomplish last prefab concatenation work in the pit can, simple structure is reasonable, has effectively reduced the construction degree of difficulty, is applicable to the complicated operational environment of mine.
The utility model provides a pair of prefab of shutoff is helped in high gas mine roof cutting roadway goaf side lane through the form that adopts inlayer steel mesh and outer steel mesh centre gripping windshield cloth, has both effectively solved the flexible too big drawback of wind account in hanging the wind account technique, has avoided slip casting, has built by laying bricks or stones too big, the yielding cracked problem of material rigidity again, has improved the effect of shutoff.
The utility model provides a pair of prefab of shutoff is helped in high gas mine roof cutting roadway goaf side lane adopts wind-break cloth and outer steel mesh to 90 modes of the lateral buckling in tunnel, has realized the abundant laminating of prefab and roof, has reduced the leakage of gas or return air current in roof position department.
The utility model provides a pair of cut top becomes prefab of side lane group shutoff in lane mining area adopts purpose-made polymer prevention of seepage sealing coating to carry out the spraying at the whole contact surface of the junction of mounting and holding band, the contact department of mounting and windshield cloth and outer steel mesh and windshield cloth, both can realize junction seamless connection, effectively prevents gaseous leakage, also increases the ductility of junction, has improved the life of prefab.
The utility model provides a pair of cut top becomes prefab of lane side lane group shutoff of lane, use U shaped steel to support the outside book 90 parts of rolling over that the prefab upside was reserved, realized the abundant contact of prefab and roof to welded rectangle steel sheet connection base in U shaped steel bottom, increased the lifting surface area of U shaped steel bottom, prevent that U shaped steel bottom from sinking and causing the holding power not enough. The wind-shield cloth that each prefab left side was reserved and next prefab right side overlap joint, and is rational in infrastructure, easily installs and has guaranteed sealing connection. The splicing part of the prefabricated member and the contact surface of the outer steel mesh and the wind-blocking cloth are sprayed by special high-molecular anti-seepage cementing coating, so that the seamless splicing of the joint is realized, the ductility of the joint is increased, and the service life of the plugging device is prolonged.
Drawings
FIG. 1 is a side roadway side blocking prefabricated part of a mining area of a roof cutting roadway of a high-gas mine;
FIG. 2 is a schematic view of the installation of the preform;
in the figure: 1-inner layer steel mesh, 2-wind shielding cloth, 3-outer layer steel mesh, 4-clamping belt, 5-fixing piece, 6-U-shaped steel and 7-connecting base.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and the roof cutting and roadway forming of a high-gas easy spontaneous combustion coal seam stope.
As shown in fig. 1, the utility model provides a prefabricated part of shutoff of roof cutting roadway goaf side lane group, including inlayer steel mesh 1, wind-break cloth 2, outer steel mesh 3, holding belt 4 and mounting 5. The wind-blocking cloth 2 is clamped between the inner layer steel mesh 1 and the outer layer steel mesh 3, is fixed by the clamping belt 4 and the fixing piece 5, and is sealed at the joint by anti-seepage cementing sealing paint. As shown in figure 2, the prefabricated member is installed by welding U-shaped steel 6 with a connecting base 7 and impermeable cementing sealing paint.
Specifically, the inner layer steel mesh 1 refers to a steel mesh facing a goaf side, the width of the inner layer steel mesh 1 is 1.5m, the height of the inner layer steel mesh is consistent with the height of a roadway of a working face cut roof roadway, the wire diameter of the inner layer steel mesh 1 is 6mm, the mesh shape of the inner layer steel mesh 1 is square, and the side length is 10 cm.
Specifically, the wind-shielding cloth 2 is tightly attached to the inner steel mesh 1, the wind-shielding cloth 2 is woven by high-strength polyester glass fibers to form a coating base cloth, the flame-retardant antistatic soft PVC is modified to serve as a surface film, and the wind-shielding curtain which is effectively combined with the high-technology surface film, flame-retardant, antistatic, high in strength, folding-resistant and long in service life is formed. The thickness of the wind-blocking cloth 2 is 0.8mm, 400mm is reserved at the upper end of the wind-blocking cloth 2, the left side of the wind-blocking cloth 2 is reserved for 300mm, and the right side and the lower end of the wind-blocking cloth 2 correspond to and coincide with the right side and the lower end of the inner-layer steel mesh 1.
Specifically, outer steel mesh 3 indicates the steel mesh that faces the tunnel side, outer steel mesh 3 hugs closely windshield cloth 2, the silk footpath of outer steel mesh 3 is 4mm, the mesh shape of outer steel mesh 3 is the rhombus, and the length of side of rhombus is 4cm, the interior angle is 60 and 120, the left side, right side, the lower extreme of outer steel mesh 3 all with the left side, right side, the lower extreme of inlayer steel mesh 1 correspond the coincidence, length 400mm is reserved to the upper end of outer steel mesh 3, length is reserved to outer steel mesh 3 upper end with windshield cloth 2 upper end is reserved length unanimously, the steel mesh that outer steel mesh 3 upper end was reserved turns over to the tunnel and is turned over 90, windshield cloth that windshield cloth 2 upper end was reserved pastes tightly the steel mesh that outer steel mesh 3 upper end was reserved.
Specifically, the holding belt 4 is a strip-shaped holding belt, the holding belt 4 is divided into an upper pair and a lower pair, the upper pair and the lower pair are respectively and transversely symmetrically arranged on two sides of the inner steel mesh 1 and the outer steel mesh 3, the holding belt 4 is made of a flame-retardant antistatic whole core PVG (polyvinyl chloride), the length of the holding belt 4 is 1.5m as long as the width of the inner steel mesh 1, the width of the holding belt 4 is 90mm, 4 drill holes with the diameter of 10mm are drilled in the holding belt 4, and the two sides of the drill holes are symmetrically arranged on the length direction of the holding belt 4.
Specifically, the fixing member 5 is a bolt and a nut, the diameter of the bolt is 10mm, and the fixing member 5 fixes the inner steel mesh 1, the wind blocking cloth 2, and the outer steel mesh 3 as a whole by drilling the clamping belt 4. The fixing piece 5 with the junction of clamping belt 4 and the fixing piece 5 penetrate through the contact position spraying of behind the windshield cloth 2 and windshield cloth sealing paint is used for sealing the fixing piece 5 with the clamping belt 4 with the space of the junction of windshield cloth 2. In addition, the sealing coating is uniformly sprayed on the outer side of the whole prefabricated part, namely the whole surface of the wind-shielding cloth 2 contacted with the outer layer steel mesh 3, the spraying thickness is 2-3 mm, so that the wind-shielding cloth 2 and the outer layer steel mesh 3 are tightly glued into a whole, and the toughness and the plugging effect of the prefabricated part are enhanced.
Specifically, the seepage-proofing cementing sealing coating is a polyurethane bi-component coating, the coating is prepared by reacting 310 parts of diphenylmethane diisocyanate (MDI) with 530 parts of polyether 220 and 160 parts of polyether 3050, the prepared isocyanate-terminated semi-prepolymer is a component A, the isocyanate-terminated semi-prepolymer is composed of 100 parts of 3,3 '-dichloro-4, 4' -diaminodiphenylmethane (MOCA) and 140 parts of polyether 3050, and 400 parts of talcum powder, 30 parts of flame retardant and 330 parts of chlorinated paraffin are added as a component B of a curing agent; when the coating is used, A: B =1:2, the tensile strength of the coating after curing is 6MPa, the elongation at break is 450%, and the oxygen index is more than 30.
Specifically, the length of the U-shaped steel 6 is 150mm longer than the height of a roadway on the side of a roof-cutting roadway mining area, the connecting base 7 is a rectangular steel plate with the thickness of 10mm, and the connecting base 7 is welded at the bottom of the U-shaped steel 6. And after the prefabricated part is manufactured and the U-shaped steel 6 and the connecting base 7 are welded on the well, transporting the prefabricated part, the processed U-shaped steel 6 and the sealing coating to a working surface in the well for installation.
Specifically, when the prefabricated member is installed, the prefabricated member is erected at one end of a defined leakage blocking area and far away from a working face and on the side of a goaf area, an inner-layer steel mesh 1 of the prefabricated member is tightly attached to a roadway side, and the upper end of the prefabricated member is tightly attached to a top plate. Two U-shaped steel 6 (the distance is 800 mm) are adopted to support the two ends of the outer steel mesh 3 and the wind-shielding cloth 2 which are reserved at the upper end of the prefabricated part and are turned over by 90 degrees, so that the prefabricated part is fully contacted with the top plate of the goaf. And (3) next prefabricated parts are installed close to the left sides where the prefabricated parts are installed in the same mode, particularly, the wind-shielding cloth 2 reserved on the left side of the previous prefabricated part is pressed on the right side of the next prefabricated part, the sealing coating is adopted to uniformly spray the connecting parts of the two prefabricated parts, and the spraying thickness is 2-3 mm, so that the sealing effect is improved. According to the method, the prefabricated parts are sequentially installed along with the stoping progress and the roadway forming length of the working face, and a blocking wall for blocking gas circulation between the goaf and the return airway is formed.
Claims (7)
1. The utility model provides a prefab of side lane group shutoff of goaf side lane in high gas mine roof cutting roadway which characterized in that: including inlayer steel mesh (1), wind-break cloth (2), outer steel mesh (3), holding belt (4) and mounting (5), wind-break cloth (2) clamp is between inlayer steel mesh (1) and outer steel mesh (3), and fixed through holding belt (4) and mounting (5), wind-break cloth (2) are sealed through the realization of prevention of seepage cementation sealing paint with the junction of inlayer steel mesh (1) and outer steel mesh (3), the whole surface spraying sealing paint of wind-break cloth (2) and outer steel mesh (3) contact, the welding of U shaped steel (6) bottom has connection base (7).
2. The prefabricated member for side roadway side wall plugging of the mining area of the high gas mine roof cutting roadway according to claim 1, characterized in that: the mining cavity steel mesh is characterized in that the inner-layer steel mesh (1) is a steel mesh facing the goaf side, the width of the inner-layer steel mesh (1) is 1.5m, the height of the inner-layer steel mesh (1) is consistent with the height of a roadway with a working face cut into the roadway, the wire diameter of the inner-layer steel mesh (1) is 6mm, the mesh shape of the inner-layer steel mesh (1) is square, and the side length of the mesh is 10 cm.
3. The prefabricated member for side roadway side wall plugging of the mining area of the high gas mine roof cutting roadway according to claim 2, characterized in that: the wind-proof cloth (2) is a coating base cloth woven by high-strength polyester glass fibers, the thickness of the wind-proof cloth (2) is 0.8mm, 400mm is reserved at the upper end of the wind-proof cloth (2), the left side of the wind-proof cloth (2) is reserved for 300mm, and the right side and the lower end of the wind-proof cloth (2) are correspondingly overlapped with the right side and the lower end of the inner-layer steel mesh (1).
4. The prefabricated member for side roadway side wall plugging of the mining area of the high gas mine roof cutting roadway according to claim 3, characterized in that: outer steel mesh (3) indicate the steel mesh of face to lane side, the silk footpath of outer steel mesh (3) is 4mm, the mesh shape of outer steel mesh (3) is the rhombus, the length of side of rhombus is 4cm, the interior angle is 60 and 120, the left side of outer steel mesh (3), the right side, the lower extreme all corresponds the coincidence with the left side of inlayer steel mesh (1), right side and lower extreme, length 400mm is reserved to the upper end of outer steel mesh (3), the steel mesh that outer steel mesh (3) upper end was reserved turns over to the tunnel and rolls over 90, the steel mesh that tight outer steel mesh (3) upper end was reserved is pasted to the wind-blocking cloth that wind-blocking cloth (2) upper end was reserved.
5. The prefabricated member for side roadway side wall plugging of the mining area of the high gas mine roof cutting roadway according to claim 4, wherein: the clamping belt (4) is of a strip-shaped structure, the clamping belt (4) is arranged into an upper pair and a lower pair, the two sides of the inner layer steel mesh (1) and the outer layer steel mesh (3) are respectively and transversely symmetrically arranged, the material of the clamping belt (4) is flame-retardant and antistatic whole core PVG, the length of the clamping belt (4) is the same as the width of the inner layer steel mesh (1), the width of the clamping belt (4) is 90mm, and drilling holes are drilled at the two ends of the clamping belt (4).
6. The prefabricated member for side roadway side wall plugging of the mining area of the high gas mine roof cutting roadway according to claim 5, wherein: fixing part (5) be bolt and nut, the drilling that bolt and nut passed through holding area (4) is fixed with inlayer steel mesh (1), windshield cloth (2) and outer steel mesh (3), the junction of fixing part (5) and holding area (4) and fixing part (5) pierce through behind windshield cloth (2) and the contact position spraying of windshield cloth have sealing paint, windshield cloth (2) and the whole surface spraying of outer steel mesh (3) contact have the prevention of seepage cementation sealing paint that thickness is 2~3 mm.
7. The prefabricated member for side roadway side wall plugging of the mining area of the high gas mine roof cutting roadway according to claim 6, wherein: the length of the U-shaped steel (6) is 150mm longer than the height of a roadway on the side of a roof-cutting roadway mining area, and the connecting base (7) is a rectangular steel plate with the thickness of 10 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022045604.1U CN213360180U (en) | 2020-09-17 | 2020-09-17 | Side roadway side wall plugging prefabricated part for roof cutting roadway mining area of high-gas mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022045604.1U CN213360180U (en) | 2020-09-17 | 2020-09-17 | Side roadway side wall plugging prefabricated part for roof cutting roadway mining area of high-gas mine |
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| CN213360180U true CN213360180U (en) | 2021-06-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253239A (en) * | 2020-09-17 | 2021-01-22 | 太原理工大学 | Side roadway side blocking prefabricated part of mining area for roof cutting and roadway forming of high-gas mine and using method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253239A (en) * | 2020-09-17 | 2021-01-22 | 太原理工大学 | Side roadway side blocking prefabricated part of mining area for roof cutting and roadway forming of high-gas mine and using method |
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