CN113790081A - Replacement filling method for coal seam roof caving region - Google Patents
Replacement filling method for coal seam roof caving region Download PDFInfo
- Publication number
- CN113790081A CN113790081A CN202111084212.9A CN202111084212A CN113790081A CN 113790081 A CN113790081 A CN 113790081A CN 202111084212 A CN202111084212 A CN 202111084212A CN 113790081 A CN113790081 A CN 113790081A
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- filling
- mold bag
- slurry
- bag
- coal seam
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Links
- 239000003245 coal Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 47
- 238000004873 anchoring Methods 0.000 claims abstract description 19
- 238000004537 pulping Methods 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000005187 foaming Methods 0.000 claims description 7
- 239000000178 monomer Substances 0.000 claims description 6
- 238000005429 filling process Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 4
- 239000011440 grout Substances 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/08—Filling-up hydraulically or pneumatically
- E21F15/10—Hydraulic or pneumatic filling-up machines
Abstract
The invention belongs to the technical field of coal mine roadway support, and particularly relates to a replacement filling method for a coal seam roof caving region. The steps of the invention are as follows S1: arranging the mould bags and performing temporary support; arranging a mold bag in a roof caving area, and temporarily supporting the mold bag before inflating the mold bag; s2: inflating the mold bag; inflating the mold bag from the bottom to the interior of the mold bag after the support of the mold bag is finished, so that the outer wall of the mold bag is completely attached to the roof caving area; s3: filling and replacing the slurry; pumping slurry into the mold bag after field pulping, and gradually exhausting air from the bottom of the mold bag until the mold bag is filled with the slurry; s4: lengthening an anchoring support; and (4) after the grout in the mold bag is solidified to form a filling body, lengthening, anchoring and supporting the filling body to enable the filling body and a roof fall area to form a stable supporting structure, and then dismantling the temporary support in the S1. The invention does not change the size of the section of the original roadway, and ensures the safety of the top plate by quickly filling the caving region and strengthening the support; and processing the cavity of the overflow area of the roadway in time.
Description
Technical Field
The invention belongs to the technical field of coal mine roadway support, and particularly relates to a replacement filling method for a coal seam roof caving region.
Background
Along with the increase of coal mining degree of depth, tunnel country rock pressure shows the aggravation, especially receives the coal road of mining influence, and coal seam board caving phenomenon takes place occasionally, and coal seam roof caving district structure is complicated, and operating space is limited, and the processing requirement is ageing strong, and traditional processing technology has following problem:
(1) at present, the wood crib is mainly processed in a mode of constructing a top, so that the labor intensity of workers is high, the operation environment is dangerous, and the potential safety hazard is high;
(2) gas is easy to accumulate in the overflow area, and the risk of gas overrun and gas explosion exists in the process of untimely treatment;
(3) the organic polymer material is filled, the price is high, the flame retardance is greatly reduced after foaming, and the foaming material is toxic and corrosive.
In combination with the problems, the material performance, the filling process, the matched construction method and the like of the coal seam caving area are researched, and a technical improvement scheme aiming at the defects of the prior art is provided.
Disclosure of Invention
The invention aims to solve the problems and provides a replacement filling method for a coal seam roof caving region.
The invention is realized by adopting the following technical scheme: a coal seam roof caving region replacement filling method comprises the following steps:
s1: arranging the mould bags and performing temporary support; arranging a mold bag in a roof caving area, and temporarily supporting the mold bag before inflating the mold bag;
s2: inflating the mold bag; inflating the mold bag from the bottom to the interior of the mold bag after the support of the mold bag is finished, so that the outer wall of the mold bag is completely attached to the roof caving area;
s3: filling and replacing the slurry; pumping slurry into the mold bag after field slurry preparation, and gradually exhausting air from the bottom of the mold bag upwards in the slurry filling process until the mold bag is filled with the slurry;
s4: lengthening an anchoring support; and (4) after the grout in the mold bag is solidified to form a filling body, lengthening, anchoring and supporting the filling body to enable the filling body and a roof fall area to form a stable supporting structure, and then dismantling the temporary support in the S1.
Further, the bottom of the mold bag described in S2 is provided with an inflation/slurry filling pipeline, the inflation/slurry filling pipeline includes an inner portion and an outer portion located inside and outside the mold bag, the outer portion is provided with a check valve and is connected with an air inlet pipe, the air inlet pipe is connected with a gas source, and an inflation switch is arranged on the air inlet pipe.
Further, the slurry in the step S3 is carried out through a filling pipe, one end of the filling pipe is communicated with an inflation/slurry filling pipeline of the mold bag, the other end of the filling pipe is communicated with a pulping system, and a filling and feeding switch is arranged on the filling pipe;
and a pressure release valve is arranged at the top of the mold bag, and the opening pressure of the pressure release valve is 0.3 MPa.
Further, the pulping system comprises an A component stirring barrel, a B component stirring barrel, a filling pump and a mixer;
the A component stirring barrel and the B component stirring barrel are respectively connected with a filling pump through an A component material suction pipe and a B component material suction pipe, the filling pump is communicated with a mixer through a material discharge pipe of the A component and a material discharge pipe of the B component, and the mixer is communicated with the filling pipe.
Further, in the elongated anchoring support in S4, anchor rods are arranged around the filling body, and anchor cables are arranged on the filling body for supporting.
Furthermore, the length of the anchor rod is not less than 2.4m, the length of the anchor rod is not less than 7.4m, and the anchoring mode is lengthened anchoring;
the pitch between anchor rods is not more than 1m, and the pitch between anchor cables is not more than 2 m.
Further, the formwork bag described in S1 is temporarily supported by a mesh reinforcement, a channel steel, and a plurality of vertical cell columns, wherein the mesh reinforcement is laid at the bottom of the formwork bag, and the channel steel and the cell columns are erected at the bottom of the mesh reinforcement.
Further, the die bag in S1 is manufactured in advance according to the size and shape of the top plate falling area.
Further, the pulping described in S3 is performed simultaneously with the inflation of the mold bag described in S2.
Further, the slurry is an inorganic filling foaming material.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method, firstly, a cavity is formed by inflating the mold bag, so that the mold bag is tightly attached to the inner wall of the caving region of the top plate, then the mold bag is filled with slurry, the slurry is well combined with the top plate of the caving region after being filled, solidified and shaped, the size of the section of the original roadway is kept after the anchor rod and the anchor rope are used for supporting, and the method is safer and more reliable; therefore, the cavity of the caving area of the roadway roof is processed in time, and potential safety hazards caused by gas gathering overrun are avoided;
2. the template bag is only required to be temporarily supported before inflation, and the lengthened anchoring support is carried out after the slurry is filled and cured, so that the labor intensity is low, and the potential safety hazard is greatly reduced;
3. the slurry adopts an early-strength, light and quick-setting inorganic filling foaming material, so that potential safety hazards caused by inflammable materials are avoided, and the manufacturing cost is low;
4. this application does not change former tunnel section size, through fill the area of caving in, strengthen strutting the assurance roof safety fast, has good popularization nature.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic structural view of the temporary support of the present invention;
in the figure: 1-top plate falling area, 2-mould bag, 3-pressure release valve, 4-inflation/slurry filling pipeline, 5-check valve, 6-pipeline quick connection, 7-steel bar net, 8-channel steel, 9-monomer column, 10-filling pipe, 11-air inlet pipe, 12-inflation switch, 13-filling feed switch, 14-mixer, 15-A component discharge pipe, 16-B component discharge pipe, 17-filling pump, 18-A component suction pipe, 19-B component suction pipe, 20-A component stirring barrel, 21-B component stirring barrel, 22-anchor rod, 23-anchor rope and filling body 24.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1 to 2, the present invention provides a technical solution: a coal seam roof caving region replacement filling method comprises the following steps:
s1: arranging the mould bags and performing temporary support; arranging a mold bag 2 in the top plate overflow area 1, and temporarily supporting the mold bag 2 before the mold bag 2 is inflated;
s2: inflating the mold bag; after the supporting of the mold bag 2 is finished, the mold bag is inflated from the bottom to the interior of the mold bag, so that the outer wall of the mold bag 2 is completely attached to the top plate caving area 1;
s3: filling and replacing the slurry; pumping slurry into the mold bag 2 after field slurry preparation, and gradually exhausting air from the bottom of the mold bag upwards in the slurry filling process until the mold bag 2 is filled; the slurry is made into slurry according to the designed water-cement ratio by adopting an early-strength, light and quick-setting inorganic filling foaming material;
s4: lengthening an anchoring support; after the slurry in the mold bag 2 is solidified to form the filling body 24 (the strength of the filling body can reach 5MPa after 24 hours and is close to that of the coal body), lengthening and anchoring the filling body 24 to enable the filling body 24 and the roof caving region 1 to form a stable supporting structure, and then dismantling the temporary supporting in S1.
The bottom of the mold bag 2 in the S2 is provided with an inflation/slurry filling pipeline 4, the inflation/slurry filling pipeline 4 comprises an inner part and an outer part which are positioned inside and outside the mold bag 2, the outer part is provided with a check valve 5 and is connected with an air inlet pipe 11, the air inlet pipe 11 is connected with the inflation/slurry filling pipeline 4 through a pipeline quick connector 6, the air inlet pipe 11 is connected with a gas source, the gas source is compressed air in an underground air pipe, and the air inlet pipe 11 is provided with an inflation switch 12.
The slurry in the S3 is processed through a filling pipe 10, one end of the filling pipe 10 is communicated with the inflation/slurry filling pipeline 4 of the mold bag 2, the other end of the filling pipe 10 is communicated with a pulping system, and a filling feed switch 13 is arranged on the filling pipe 10;
and a pressure release valve 3 is arranged at the top of the mold bag 2, and the opening pressure of the pressure release valve 3 is 0.3 MPa.
The pulping system comprises an A component stirring barrel 20, a B component stirring barrel 21, a filling pump 17 and a mixer 14;
the A component stirring barrel 20 and the B component stirring barrel 21 are respectively connected with the filling pump 17 through an A component suction pipe 18 and a B component suction pipe 19, the filling pump 17 is communicated with the mixer 14 through a discharge pipe 15 and a B component discharge pipe 16 of the discharge pipeline, and the mixer 14 is communicated with the filling pipe 10; the filling pump adopts an air source as power, has simple structure and simple and convenient operation, and can adapt to the underground operation environment.
The lengthened anchoring support in the S4 is that the anchor rods 22 are arranged on the periphery of the filling body 24 in a driving mode, the anchor cables 23 are arranged on the filling body 24 for supporting, the density of the filling body 24 is not more than 0.8t/m for carrying out thin film planting, the flow loss time is 30min, the 2h compressive strength reaches 1.5MPa, and the lengthened anchoring support has high toughness and high residual strength.
The length of the anchor rod 22 is not less than 2.4m, the length of the anchor cable 23 is not less than 7.4m, and the anchoring mode is lengthened anchoring;
the pitch of the anchor rods 22 is not more than 1m, and the pitch of the anchor cables 23 is not more than 2 m.
The mould bag 2 in the S1 is temporarily supported through the reinforcing mesh 7, the channel steel 8 and a plurality of vertical monomer columns 9, the reinforcing mesh 7 is laid at the bottom of the mould bag 2, the channel steel 8 and the monomer columns 9 are erected at the bottom of the reinforcing mesh 7, and the space between the monomer columns 9 is not more than 0.8m, so that the mould bag 2 is temporarily supported.
The mold pocket 2 in S1 is previously manufactured according to the size and shape of the roof caving region 1.
Pulping in S3 and inflation of the die bag in S2 are carried out simultaneously, and working efficiency is improved.
The slurry is an inorganic filling foaming material.
The mould bag 2 is made of flame-retardant materials, is air-tight and water-proof, has certain strength, toughness and elasticity, is not easy to be scratched by hard rock blocks and is not easy to be propped by incompletely hardened slurry.
The working principle of the invention is as follows:
inflating the mold bag in S2; opening the check valve 5, closing the filling feed switch 13, opening the inflation switch 12, filling gas into the mold bag 2 through the air inlet pipe 11, attaching the outer wall of the mold bag to the caving region after the gas is filled, and closing the inflation switch 12;
pulping in S3: the bi-component filling materials are respectively stirred uniformly in the A component stirring barrel 20 and the B component stirring barrel 21 according to a set water-cement ratio, the stirrer is kept normally open, slurry in the barrels is prevented from settling and layering, in order to meet the performance requirements of light weight and toughness of the material, a proper amount of foaming agent and fibers are respectively added into the A, B two components, and the optimal material performance is obtained by adjusting the addition amount of the fibers and the foaming agent; slurry is pressurized by a filling pump 17 through an A component suction pipe 18 and a B component suction pipe 19 respectively and then is discharged from an A component discharge pipe 15 and a B component discharge pipe 16, the two-component slurry is uniformly mixed by a mixer 14 and then enters a filling pipe 10, and the pressure after mixing is less than 1.5MPa so as to reduce disturbance to a roof crushed coal body;
replacement filling in S3: the mixture is conveyed into the mold bag 2 through the filling pipe 10, the pressure in the mold bag rises along with the continuous filling of the slurry in the mold bag 2, when the pressure in the mold bag exceeds 0.3MPa, the pressure release valve 3 at the top of the mold bag is opened, the gas is discharged, the process is circulated until the slurry is filled into the mold bag 2, the filling pump 17 is closed, the check valve 5 is closed, and the filling feed switch 13 is closed.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A coal seam roof caving region replacement filling method is characterized by comprising the following steps: the method comprises the following steps:
s1: arranging the mould bags and performing temporary support; arranging a mold bag (2) in the top plate overflow area (1), and temporarily supporting the mold bag (2) before the mold bag is inflated;
s2: inflating the mold bag; after the supporting of the mold bag (2) is finished, the mold bag is inflated from the bottom to the interior of the mold bag, so that the outer wall of the mold bag (2) is completely attached to the top plate caving area (1);
s3: filling and replacing the slurry; pumping slurry into the mold bag (2) after field slurry preparation, and gradually exhausting air from the bottom of the mold bag upwards in the slurry filling process until the mold bag (2) is filled;
s4: lengthening an anchoring support; and (3) after the slurry in the mould bag (2) is solidified to form a filling body (24), lengthening the filling body (24), anchoring and supporting to enable the filling body (24) and the roof caving region (1) to form a stable supporting structure, and then removing the temporary support in the S1.
2. The coal seam roof caving region replacement filling method of claim 1, characterized in that: s2, the bottom of the mold bag (2) is provided with an inflation/slurry filling pipeline (4), the inflation/slurry filling pipeline (4) comprises an inner part and an outer part which are positioned inside and outside the mold bag (2), the outer part is provided with a check valve (5) and is connected with an air inlet pipe (11), the air inlet pipe (11) is connected with a gas source, and the air inlet pipe (11) is provided with an inflation switch (12).
3. The coal seam roof caving region replacement filling method as claimed in claim 2, wherein: the slurry in the S3 is processed through a filling pipe (10), one end of the filling pipe (10) is communicated with an inflation/slurry filling pipeline (4) of the mold bag (2), the other end of the filling pipe is communicated with a pulping system, and a filling feed switch (13) is arranged on the filling pipe (10);
and a pressure release valve (3) is arranged at the top of the mold bag (2), and the opening pressure of the pressure release valve (3) is 0.3 MPa.
4. The coal seam roof caving region replacement filling method of claim 3, characterized in that: the pulping system comprises an A-component stirring barrel (20), a B-component stirring barrel (21), a filling pump (17) and a mixer (14);
the A component stirring barrel (20) and the B component stirring barrel (21) are respectively connected with the filling pump (17) through an A component suction pipe (18) and a B component suction pipe (19), the filling pump (17) is communicated with the mixer (14) through a discharge pipe (15) and a B component discharge pipe (16), and the mixer (14) is communicated with the filling pipe (10).
5. The coal seam roof caving region replacement filling method of any one of claims 1-4, wherein: the lengthened anchoring support in the S4 is to drive anchor rods (22) around the filling body (24) and drive anchor cables (23) on the filling body (24) for supporting.
6. The coal seam roof caving region replacement filling method of claim 5, characterized in that: the length of the anchor rod (22) is not less than 2.4m, the length of the anchor cable (23) is not less than 7.4m, and the anchoring mode is lengthened anchoring;
the pitch of the anchor rods (22) is not more than 1m, and the pitch of the anchor cables (23) is not more than 2 m.
7. The coal seam roof caving region replacement filling method of claim 6, wherein: the mould bag (2) in the S1 is temporarily supported through a steel mesh (7), a channel steel (8) and a plurality of vertical monomer columns (9), the steel mesh (7) is laid at the bottom of the mould bag (2), and the channel steel (8) and the monomer columns (9) are erected at the bottom of the steel mesh (7).
8. The coal seam roof caving region replacement filling method of claim 7, characterized in that: and S1, the die bag (2) is manufactured in advance according to the size and the shape of the top plate caving area (1).
9. The coal seam roof caving region replacement filling method of claim 8, characterized in that: pulping as described in S3 is performed simultaneously with inflation of the mold bag as described in S2.
10. The coal seam roof caving region replacement filling method of claim 9, characterized in that: the slurry is an inorganic filling foaming material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111084212.9A CN113790081B (en) | 2021-09-16 | 2021-09-16 | Replacement filling method for caving region of coal seam roof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111084212.9A CN113790081B (en) | 2021-09-16 | 2021-09-16 | Replacement filling method for caving region of coal seam roof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113790081A true CN113790081A (en) | 2021-12-14 |
| CN113790081B CN113790081B (en) | 2023-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111084212.9A Active CN113790081B (en) | 2021-09-16 | 2021-09-16 | Replacement filling method for caving region of coal seam roof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203655220U (en) * | 2013-11-28 | 2014-06-18 | 华北科技学院 | Device for sealing drill hole for gas extraction through air bag blocking and grouting under pressure |
| CN203796320U (en) * | 2014-04-18 | 2014-08-27 | 河南工业和信息化职业学院 | High caving region filling system |
| CN203978490U (en) * | 2014-06-09 | 2014-12-03 | 天津市新策电子设备科技有限公司 | Gao Mao district stowage unit |
| CN105003299A (en) * | 2014-12-16 | 2015-10-28 | 山东科技大学 | Flexible filling bag for gob-side entry retaining and its application method |
| CN107654238A (en) * | 2017-09-15 | 2018-02-02 | 中国矿业大学 | A kind of processing method for having dug fall of ground |
| CN207620844U (en) * | 2017-12-14 | 2018-07-17 | 淮南矿业(集团)有限责任公司 | A kind of mine high-water material filling unit |
| CN112901226A (en) * | 2019-12-03 | 2021-06-04 | 新疆维吾尔自治区煤炭科学研究所 | Ultra-thin roof roadway supporting method under goaf |
-
2021
- 2021-09-16 CN CN202111084212.9A patent/CN113790081B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203655220U (en) * | 2013-11-28 | 2014-06-18 | 华北科技学院 | Device for sealing drill hole for gas extraction through air bag blocking and grouting under pressure |
| CN203796320U (en) * | 2014-04-18 | 2014-08-27 | 河南工业和信息化职业学院 | High caving region filling system |
| CN203978490U (en) * | 2014-06-09 | 2014-12-03 | 天津市新策电子设备科技有限公司 | Gao Mao district stowage unit |
| CN105003299A (en) * | 2014-12-16 | 2015-10-28 | 山东科技大学 | Flexible filling bag for gob-side entry retaining and its application method |
| CN107654238A (en) * | 2017-09-15 | 2018-02-02 | 中国矿业大学 | A kind of processing method for having dug fall of ground |
| CN207620844U (en) * | 2017-12-14 | 2018-07-17 | 淮南矿业(集团)有限责任公司 | A kind of mine high-water material filling unit |
| CN112901226A (en) * | 2019-12-03 | 2021-06-04 | 新疆维吾尔自治区煤炭科学研究所 | Ultra-thin roof roadway supporting method under goaf |
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| Publication number | Publication date |
|---|---|
| CN113790081B (en) | 2023-12-01 |
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