CN113550763A - Support structure for quickly constructing gob-side entry retaining and construction method thereof - Google Patents
Support structure for quickly constructing gob-side entry retaining and construction method thereof Download PDFInfo
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- CN113550763A CN113550763A CN202110976962.0A CN202110976962A CN113550763A CN 113550763 A CN113550763 A CN 113550763A CN 202110976962 A CN202110976962 A CN 202110976962A CN 113550763 A CN113550763 A CN 113550763A
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- supporting block
- gob
- block
- grooves
- side entry
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention provides a support structure for quickly constructing a gob-side entry retaining and a construction method thereof, wherein the support structure comprises an upper support block, a plurality of first grooves, a plurality of second grooves and a plurality of third grooves, wherein the top of the upper support block is provided with the first grooves; a plurality of fourth grooves are formed in the top of the lower supporting block; the connecting ribs are arranged in a plurality of numbers, the top ends of the connecting ribs are inserted into the third grooves, and the bottom ends of the connecting ribs are inserted into the fourth grooves; the middle supporting blocks are respectively and symmetrically arranged between the upper supporting block and the lower supporting block, the supporting strength of the two middle supporting blocks is lower than that of the upper supporting block and that of the lower supporting block, a plurality of arc-shaped grooves are formed in each middle supporting block, and the two oppositely arranged arc-shaped grooves are spliced and then embedded on the connecting ribs. The invention improves the construction speed of the gob-side entry retaining, improves the working conditions of underground gob-side entry retaining construction workers, improves the operation efficiency of the gob-side entry retaining and reduces the construction cost of the gob-side entry retaining.
Description
Technical Field
The invention belongs to the technical field of coal mining equipment, and particularly relates to a support structure for quickly constructing a gob-side entry retaining and a construction method thereof.
Background
Longwall mining of coal mines generally maintains the stability of a stope gallery by reserving coal pillars between two working faces; however, a plurality of coal pillars are reserved between two working faces, which results in a great deal of coal resource waste, and in order to solve the problems caused by using the coal pillars, the coal pillars are gradually replaced by a gob-side entry retaining technology for retaining an upper section mining drift for lower section mining, and the existing gob-side entry retaining technical method mainly comprises the following steps: the method comprises the following steps of manufacturing a roadside support shape according to the section size of a roadway by using a high-strength plastic film, injecting mixed filler into a flexible plastic film on site, fixing the flexible plastic film by using a back plate, channel steel and the like, and completing roadside support after the filler is solidified and reaches the support strength; although the method can solve the problem of waste of a large amount of coal resources, the method has the problems of long construction time and high construction strength. Therefore, the support structure for quickly constructing the gob-side entry retaining and the construction method thereof, which can reduce the labor intensity of constructing the gob-side entry retaining and reduce the construction time of retaining and supporting the gob-side entry retaining, have very important significance.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and the support structure for quickly constructing the gob-side entry retaining and the construction method thereof, which are efficient, quick and safe, can realize the non-pillar mining and improve the recovery rate of coal resources, are of great significance.
In order to achieve the above object, the present invention provides a support structure for rapidly constructing a gob-side entry retaining, comprising:
the top of the upper supporting block is provided with a first groove for placing an expanding agent, the middle of the upper supporting block is provided with a second groove for placing a stress-strain sensor, and the bottom of the upper supporting block is provided with a plurality of third grooves;
the bottom of the lower supporting block is arranged on the bottom wall of the coal mining wall, and the top of the lower supporting block is provided with a plurality of fourth grooves which correspond to the third grooves one by one;
the connecting ribs are arranged in a plurality and are used for connecting the upper supporting block and the lower supporting block, the top ends of the connecting ribs are inserted into the third grooves, the bottom ends of the connecting ribs are inserted into the fourth grooves, and the bottom ends of the connecting ribs are positioned above the bottom walls of the fourth grooves;
two well supporting shoes are symmetrically established between last supporting shoe and bottom suspension fagging respectively, and the support intensity of two well supporting shoes all is less than the support intensity of last supporting shoe and bottom suspension fagging, has all seted up a plurality of arc walls on two well supporting shoes, and the nestification is on the splice after being located two relative arc walls that set up on two well supporting shoes.
Preferably, the bottom ends of the connecting ribs are all in a conical structure.
Preferably, a plurality of strip-shaped blocks are filled in a gap between the arc-shaped groove and the connecting rib which are nested on the connecting rib after the two connecting ribs are spliced, and the plurality of strip-shaped blocks are made of the same material as the support block in the preparation process.
Preferably, the distance between two adjacent third grooves is 0.75m-0.85 m.
Preferably, the bottom surface of the upper support block and the top surface of the lower support block are both rectangular.
Preferably, the bottom surface of the upper support block and the top surface of the lower support block are both square, and the side length of the square is 3m-3.5 m.
Preferably, the plurality of third grooves are distributed in a matrix.
A construction method for quickly constructing a support structure of a gob-side entry retaining comprises the following steps:
s1: the upper supporting block, the lower supporting block and the middle supporting block are prefabricated in advance according to the section size of the roadway respectively, and the total height of the assembled upper supporting block, lower supporting block and middle supporting block is lower than the total height of the gob-side entry retaining by 100-150 mm;
s2: conveying the prefabricated upper supporting block, the prefabricated lower supporting block and the prefabricated middle supporting block of the S1 to the position 5-10m ahead of the coal face, forming a notch for fixing the lower supporting block at the position 3-5m close to the coal face, fixing the lower supporting block at the notch, inserting the bottom end of each connecting rib into each fourth groove, and inserting the top end of each connecting rib into a third groove corresponding to the fourth groove; at the moment, the upper supporting block is supported by a jack, the two middle supporting blocks are pushed into the space between the upper supporting block and the lower supporting block from the left side and the right side respectively, at the moment, arc-shaped grooves formed in the two middle supporting blocks are spliced and then sleeved outside the connecting ribs, then the arc-shaped grooves spliced and sleeved outside the connecting ribs are filled with a plurality of bar-shaped blocks, the jack is removed, and then quantitative water is injected into the first groove to enable the expanding agent to expand to be connected with the jack;
s3: in order to continuously support and seal the goaf side as the face mining progresses, the upper support block, the lower support block and the middle support block are assembled according to the above S2, and are sequentially arranged on the goaf side along the roadway, and a stress-strain sensor is installed in the second groove every 20-100 m.
Preferably, the outer sides of the assembled upper support block, the assembled lower support block and the assembled middle support block are connected and reinforced by channel steel.
Preferably, the prefabricated upper support block and the prefabricated lower support block are both prepared from the following raw material components in parts by mass: 40-50% of coal gangue, 5-10% of fly ash, 18-25% of cement, 5-10% of sand, 10-15% of pebble and 9-15% of water; the prefabricated middle supporting block is prepared from the following raw material components in parts by mass: 50-55% of coal gangue, 5-10% of fly ash, 15-20% of cement, 5-10% of sand, 5-10% of pebble, 10-15% of water, 1-2% of asbestos gauze and 1-2% of cross-linking agent.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the upper supporting block, the lower supporting block and the middle supporting block are prefabricated on the ground in advance, then the prefabricated upper supporting block, lower supporting block and middle supporting block are sent to an operation place, then the upper supporting block and the lower supporting block are connected through a plurality of connecting ribs, and then the middle supporting block is nested into the connecting ribs for further buffering the stress of the connecting ribs.
Drawings
FIG. 1 is a schematic overall cross-sectional view of a support structure for rapidly constructing a gob-side entry retaining structure according to the present invention;
FIG. 2 is a cross-sectional view of an upper supporting block of the supporting structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 3 is a schematic view of a connecting rib of a support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 4 is a schematic view of a middle support block of the support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 5 is a schematic view of a lower support block of the support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 6 is a schematic bottom view of an upper support block of a support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 7 is a top view of an upper support block of a support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 8 is a schematic diagram of a construction method for rapidly constructing a support structure of a gob-side entry retaining according to the present invention;
FIG. 9 is a top view of a construction method for rapidly constructing a support structure for gob-side entry retaining according to the present invention.
Description of reference numerals:
1. the stress strain sensor comprises an upper supporting block, 2 parts of a first groove, 3 parts of a second groove, 4 parts of a third groove, 5 parts of a lower supporting block, 6 parts of a fourth groove, 7 parts of a connecting rib, 8 parts of a middle supporting block, 9 parts of an arc-shaped groove and 10 parts of a stress strain sensor.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the technical scheme in the embodiment of the invention is clearly and completely described below with reference to the attached drawings in the embodiment of the invention.
In the description of the present invention, it should be understood that the terms used in the description of the present invention for the orientation, such as "height", "length", "width", "front surface", are based on the description when the body is vertically placed, i.e., perpendicular to the ground, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Examples
As shown in fig. 1 to 9, the specific embodiment of the present invention is implemented by using the following technical solutions, and a support structure for quickly constructing a gob-side entry retaining includes:
the top of the upper supporting block 1 is provided with a first groove 2 for placing an expanding agent, the middle of the upper supporting block is provided with a second groove 3 for placing a stress-strain sensor 10, and the bottom of the upper supporting block is provided with a plurality of third grooves 4;
the bottom of the lower supporting block 5 is arranged on the bottom wall of the coal mining wall, and the top of the lower supporting block is provided with a plurality of fourth grooves 6 which correspond to the third grooves 4 one by one;
the connecting ribs 7 are arranged in a plurality and are used for connecting the upper supporting block 1 and the lower supporting block 5, the top ends of the connecting ribs 7 are inserted into the third grooves 4, the bottom ends of the connecting ribs 7 are inserted into the fourth grooves 6, and the bottom ends of the connecting ribs 7 are positioned above the bottom walls of the fourth grooves 6;
two well supporting shoes 8, the symmetry is established respectively between last supporting shoe 1 and bottom suspension fagging 5, and the support intensity of two well supporting shoes 8 all is less than the support intensity of last supporting shoe 1 and bottom suspension fagging 5, has all seted up a plurality of arc walls 9 on two well supporting shoes 8, is located to nest on splice behind two arc walls 9 that set up relatively on two well supporting shoes 8 on the splice on splice bar 7.
The opening shapes of the third groove 4 and the fourth groove 6 are consistent with the cross section shape of the connecting rib 7, and the opening shapes of the third groove 4 and the fourth groove 6 and the cross section of the connecting rib 7 are preferably circular, because the circular shape is the most convenient to process.
The support structure for quickly constructing the gob-side entry retaining is characterized in that an upper support block 1, a middle support block 8, a lower support block 5 and a plurality of connecting ribs 7 are assembled into a support structure unit in a modularized mode, wherein the strength of the middle support block 8 is lower than that of the upper support block 1 and the lower support block 5, when the support structure unit is subjected to roof pressure exceeding the compressive strength of the middle support block 8, the middle support block 8 deforms, the middle support block 8 can still keep the integrity of the shape after the deformation is generated due to the fact that asbestos gauze is contained in raw material components for preparing the middle support block 8, the upper support block 1 generates downward displacement along the connecting ribs 7 after the middle support block 8 deforms, and the roof generates a certain deformation amount, so that part of mine pressure is released, and the roof pressure and the support structure unit achieve force balance again. In order to achieve continuous advancing of the mining face, the support structure units are arranged continuously along the goaf, and no gap is left between two adjacent support structure units.
Furthermore, the bottoms of the connecting ribs 7 are all of a conical structure, and the conical structure is set because when the pressure applied to the top of the upper supporting block 1 is increased, the upper supporting block 1 descends, the middle supporting block 8 deforms, and the resistance change is a gradual change process when the connecting ribs move downwards in the fourth groove 6 of the lower supporting block 5.
Furthermore, a plurality of strip-shaped blocks are filled in a gap between the arc-shaped grooves 9 and the connecting ribs 7 which are spliced and then nested on the connecting ribs 7, and the strip-shaped blocks are made of a material for preparing the middle supporting block 8 and used for increasing the friction force and the supporting force between each connecting rib 7 and the inserted arc-shaped groove 9.
Further, the distance between two adjacent third grooves 4 is 0.75m-0.85 m.
Furthermore, the bottom surface of the upper support block 1 and the top surface of the lower support block 5 are both rectangular, and the bottom surface of the upper support block 1 and the top surface of the lower support block 5 can also be set into different shapes according to different mining mines.
Furthermore, the bottom surface of the upper support block 1 and the top surface of the lower support block 5 are both square, the side length of the square is 3m-3.5m, and the bottom surface of the upper support block 1 and the top surface of the lower support block 5 can also be set into different shapes according to different mining mines.
Further, the plurality of third grooves 4 are distributed in a matrix.
A construction method for quickly constructing a support structure of a gob-side entry retaining comprises the following steps:
s1: the roadway section size needs to be measured in advance, then the upper supporting block 1, the lower supporting block 5 and the middle supporting block 8 are prefabricated on the ground in advance according to the roadway section size, the total height of the upper supporting block 1, the lower supporting block 5 and the middle supporting block 8 is lower than the total height of the gob-side entry retaining by 100-plus-150 mm, and the prefabricated upper supporting block 1 and the prefabricated lower supporting block 5 are made of the following raw material components in percentage by mass: 40-50% of coal gangue, 5-10% of fly ash, 18-25% of cement, 5-10% of sand, 10-15% of pebble and 9-15% of water; the prefabricated middle supporting block 8 is prepared from the following raw materials in parts by mass: 50-55% of coal gangue, 5-10% of fly ash, 15-20% of cement, 5-10% of sand, 5-10% of pebbles, 10-15% of water, 1-2% of asbestos meshes and 1-2% of a cross-linking agent, wherein the cross-linking agent is any one of epoxy resin or polyethylene and the like;
s2: conveying the upper supporting block 1, the lower supporting block 5 and the middle supporting block 8 which are prefabricated in the step S1 to the position 5-10m ahead of a coal face, forming a notch for fixing the lower supporting block 5 at the position 3-5m close to the coal face, fixing the lower supporting block 5 at the notch, inserting the bottom ends of the connecting ribs 7 into the fourth grooves 6, and inserting the top ends of the connecting ribs 7 into the third grooves 4 corresponding to the fourth grooves 6; at the moment, a jack is used for supporting an upper supporting block 1, two middle supporting blocks 8 are respectively pushed into the space between the upper supporting block 1 and a lower supporting block 5 from the left side and the right side, at the moment, arc-shaped grooves 9 arranged on the two middle supporting blocks 8 are spliced and then sleeved outside connecting ribs 7, then arc-shaped grooves 9 spliced and sleeved outside the connecting ribs 7 are filled with a plurality of strip-shaped blocks, the jack is removed, then quantitative water is injected into a first groove 2 to enable an expanding agent to expand and joint the top, as shown in figure 8, an assembled quick roadway protection supporting block is installed in a mining roadway B and is close to a mining working face (to be mined C) by 3-5 m;
s3: as the working face mining advances, in order to continuously support and seal one side of the goaf, as shown in fig. 8-9, the upper supporting block 1, the lower supporting block 5 and the middle supporting block 8 are assembled according to the above S2 and sequentially arranged on one side close to the goaf a along the stoping roadway B in sequence, in order to ensure the stability of the stoping roadway B, and a stress-strain sensor 10 is installed in the second groove 3 every 20-100m for monitoring the deformation condition of the supporting structure in real time.
Further, the outer sides of the assembled upper supporting block 1, the lower supporting block 5 and the middle supporting block 8 are connected and reinforced by channel steel, so that the stability is improved.
The above disclosure is only for the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. A support structure for rapidly constructing a gob-side entry retaining, comprising:
the top of the upper supporting block (1) is provided with a first groove (2) for placing an expanding agent, the middle of the upper supporting block is provided with a second groove (3) for placing a stress-strain sensor (10), and the bottom of the upper supporting block is provided with a plurality of third grooves (4);
the bottom of the lower supporting block (5) is arranged on the bottom wall of the coal mining wall, and the top of the lower supporting block is provided with a plurality of fourth grooves (6) which correspond to the third grooves (4) one by one;
the connecting ribs (7) are arranged in a plurality and are used for connecting the upper supporting block (1) and the lower supporting block (5), the top ends of the connecting ribs (7) are inserted into the third grooves (4), the bottom ends of the connecting ribs (7) are inserted into the fourth grooves (6), and the bottom ends of the connecting ribs (7) are positioned above the bottom wall of the fourth grooves (6);
two well supporting shoes (8), the symmetry is established respectively between last supporting shoe (1) and lower bolster (5), and the support intensity of two well supporting shoes (8) all is less than the support intensity of last supporting shoe (1) and lower bolster (5), has all seted up a plurality of arc walls (9) on two well supporting shoes (8), nestification is gone up in splice on splice in two arc walls (9) that are located relative setting on two well supporting shoes (8) after.
2. A rapid construction gob-side entry support structure as claimed in claim 1 wherein said plurality of connector bars (7) are of tapered configuration at their lower ends.
3. The support structure for rapidly constructing the gob-side entry according to claim 1 or 2, wherein the gap between the arc-shaped groove (9) on the connecting rib (7) and the connecting rib (7) after two splicing operations is filled with a plurality of bar-shaped blocks, and the plurality of bar-shaped blocks are made of the same material as the support block (8) in the preparation process.
4. A rapid-construction gob-side entry support structure according to claim 1, wherein the spacing between adjacent third recesses (4) is in the range of 0.75m to 0.85 m.
5. A support structure for rapid construction of gob-side entries as set forth in claim 1, wherein said upper support block (1) has a bottom surface and said lower support block (5) has a top surface which are both rectangular.
6. The support structure for rapid construction of gob-side entry as set forth in claim 5, wherein said bottom surface of said upper support block (1) and said top surface of said lower support block (5) are each square having a side length of 3m to 3.5 m.
7. A rapid-construction gob-side entry support structure according to claim 1, wherein said plurality of third recesses (4) are arranged in a matrix.
8. The construction method for rapidly constructing a support structure for a gob-side entry according to claim 1, comprising the steps of:
s1: the upper supporting block (1), the lower supporting block (5) and the middle supporting block (8) are prefabricated in advance according to the size of the section of the roadway, and the total height of the assembled upper supporting block (1), lower supporting block (5) and middle supporting block (8) is 100-150mm lower than that of the gob-side entry retaining;
s2: conveying the upper supporting block (1), the lower supporting block (5) and the middle supporting block (8) which are prefabricated in the S1 mode to the position 5-10m in front of a coal face, forming a notch for fixing the lower supporting block (5) at the position 3-5m close to the coal face, fixing the lower supporting block (5) at the notch, inserting the bottom ends of the connecting ribs (7) into the fourth grooves (6), and inserting the top ends of the connecting ribs (7) into the third grooves (4) corresponding to the fourth grooves (6); at the moment, a jack is used for supporting the upper supporting block (1), the two middle supporting blocks (8) are respectively pushed into the space between the upper supporting block (1) and the lower supporting block (5) from the left side and the right side, at the moment, the arc-shaped grooves (9) formed in the two middle supporting blocks (8) are spliced and then sleeved outside the connecting ribs (7), then the arc-shaped grooves (9) spliced and sleeved outside the connecting ribs (7) are filled with a plurality of bar-shaped blocks, the jack is removed, and quantitative water is injected into the first groove (2) to enable the expanding agent to expand to joint the top;
s3: in order to continuously support and seal one side of the goaf as the face mining advances, the upper support block (1), the lower support block (5) and the middle support block (8) are assembled according to the above S2, and are sequentially arranged on one side close to the goaf along the roadway, and a stress-strain sensor (10) is installed in the second groove (3) every 20-100 m.
9. The construction method for rapidly constructing the supporting structure of the gob-side entry according to claim 8, wherein the outer sides of the assembled upper supporting block (1), lower supporting block (5) and middle supporting block (8) are reinforced by channel steel connection.
10. The construction method for rapidly constructing the support structure of the gob-side entry according to claim 8, wherein the prefabricated upper support block (1) and the prefabricated lower support block (5) are made of the following raw materials in parts by mass: 40-50% of coal gangue, 5-10% of fly ash, 18-25% of cement, 5-10% of sand, 10-15% of pebble and 9-15% of water; the prefabricated middle supporting block (8) is prepared from the following raw materials in parts by mass: 50-55% of coal gangue, 5-10% of fly ash, 15-20% of cement, 5-10% of sand, 5-10% of pebble, 10-15% of water, 1-2% of asbestos gauze and 1-2% of cross-linking agent.
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| CN202110976962.0A CN113550763B (en) | 2021-08-24 | 2021-08-24 | Supporting structure for quickly constructing gob-side entry retaining and construction method thereof |
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| CN202110976962.0A CN113550763B (en) | 2021-08-24 | 2021-08-24 | Supporting structure for quickly constructing gob-side entry retaining and construction method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161480A (en) * | 2013-03-14 | 2013-06-19 | 中国矿业大学 | Method for actively supporting lane side filling gob-side entry retaining |
| CN103883336A (en) * | 2014-04-11 | 2014-06-25 | 山东科技大学 | Adjustable gob-side entry retaining wall with initial active and later buffering support and implementing method thereof |
| WO2016206616A1 (en) * | 2015-06-24 | 2016-12-29 | 何满潮 | Equipment system for no-roadway no-coal-pillar retained roadway mining method |
-
2021
- 2021-08-24 CN CN202110976962.0A patent/CN113550763B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161480A (en) * | 2013-03-14 | 2013-06-19 | 中国矿业大学 | Method for actively supporting lane side filling gob-side entry retaining |
| CN103883336A (en) * | 2014-04-11 | 2014-06-25 | 山东科技大学 | Adjustable gob-side entry retaining wall with initial active and later buffering support and implementing method thereof |
| WO2016206616A1 (en) * | 2015-06-24 | 2016-12-29 | 何满潮 | Equipment system for no-roadway no-coal-pillar retained roadway mining method |
Non-Patent Citations (1)
| Title |
|---|
| 林东才;栾恒杰;贾传洋;张壮壮;: "预筑大型混凝土砌块组装墙快速沿空留巷技术" * |
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