CN111005763A - Coal mine underground sealing wall and preparation method thereof - Google Patents
Coal mine underground sealing wall and preparation method thereof Download PDFInfo
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- CN111005763A CN111005763A CN201911340863.2A CN201911340863A CN111005763A CN 111005763 A CN111005763 A CN 111005763A CN 201911340863 A CN201911340863 A CN 201911340863A CN 111005763 A CN111005763 A CN 111005763A
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- Prior art keywords
- wall
- wall body
- pipe
- sealing
- coal mine
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- 239000003245 coal Substances 0.000 title claims abstract description 51
- 238000007789 sealing Methods 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims description 7
- 238000011049 filling Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000010797 grey water Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 239000000499 gel Substances 0.000 claims description 2
- 238000010422 painting Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims 7
- 239000011247 coating layer Substances 0.000 claims 1
- 238000009825 accumulation Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 208000002599 Smear Layer Diseases 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011449 brick Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21F17/103—Dams, e.g. for ventilation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention provides a coal mine underground sealing wall which comprises a first wall body, a filling material layer, a second wall body, arc-shaped fixing parts, a gas drainage pipe, a water drainage pipe and a plurality of grouting pipes with ball valves, wherein the filling material layer is positioned between the first wall body and the second wall body, the arc-shaped fixing parts are arranged at the joint of the upper part of the outer wall of the second wall body and a top plate, the outer surfaces of the first wall body and the second wall body are provided with moisture-proof smear layers, the upper parts of the first wall body and the second wall body extend into the top plate coal bed by 0.3m, the bottom part of the first wall body and the second wall body extend into a bottom plate coal bed by 0.2m, the left part and the right part of the first wall body and the second wall body extend into a roadway wall coal bed by 0.. The sealing wall skin is not easy to fall off, the sealing effect is outstanding, and the gas accumulation on the upper part is less.
Description
Technical Field
The invention belongs to the field of coal mine safety, and particularly relates to a coal mine lower sealing wall and a preparation method thereof.
Background
Spontaneous combustion of coal in the goaf and over-limit of gas content are major threats in the underground coal mine. After the coal on the coal face is mined, sealing treatment is needed to prevent the air leakage of the goaf from causing the spontaneous combustion of the residual coal in the goaf and inhibiting the gas in the goaf from flowing out to other places, which is very important for controlling the fire and the gas in the underground coal mine.
The underground coal mine airtight wall is mostly built by bricks, and the wall is plastered by mortar. Due to the humid and shady climate and the air oxidation effect of the underground coal mine, the skin of the underground coal mine sealing wall can fall off along with the lapse of time, namely the skin of the sealing wall falls off, so that the tightness of the sealing wall can be directly influenced, and the air leakage of the goaf is difficult to prevent, and hidden troubles are buried in other places for spontaneous combustion of coal left in the goaf and gas emission of the goaf.
Meanwhile, gas accumulation above the outer side of the wall body of the closed wall is a difficult problem troubling coal mine workers all the time, and the gas accumulation above the wall body brings potential safety hazards to coal mines.
Disclosure of Invention
The invention provides a coal mine underground sealing wall, which is difficult to fall off, has an outstanding sealing effect and less upper gas accumulation.
It is another object of the present invention to provide a method for preparing the sealant wall of the present invention.
In order to achieve the purpose, the technical scheme of the invention is as follows: a coal mine underground sealing wall comprises a first wall body, a filling material layer, a second wall body, arc-shaped fixing pieces, a gas drainage pipe, a drain pipe and a plurality of grouting pipes with ball valves, wherein the filling material layer is positioned between the first wall body and the second wall body, the arc-shaped fixing pieces are arranged at the joint of the upper part of the outer wall of the second wall body and a top plate, two straight edges of the arc-shaped fixing pieces are respectively fixedly connected with the outer wall of the second wall body and the top plate and have the same width with the sealing wall, moisture-proof smear layers are arranged on the outer surfaces of the first wall body and the second wall body, the upper parts of the first wall body and the second wall body extend into a coal seam of the top plate by 0.3m, the bottom part of the first wall body and the second wall body extend into a coal seam of a bottom plate by 0.2m, the left part and the right part of the first wall body extend into a coal seam of a roadway wall; the water drainage pipe is arranged on the lower side of the middle part of the sealing wall and penetrates through the sealing wall body, and a U-shaped pipe is arranged at the end part of the water drainage pipe, which extends out of the side of the second wall body; the grouting pipes are obliquely arranged on the upper portion of the second wall body in a penetrating mode at equal intervals, and discharge ports of the grouting pipes are located at the top of the filling layer.
The thickness of the filling material layer is 3 m.
The thickness of the first wall body and the second wall body is 0.5 m.
The filling material layer is a mixture of cement, fly ash and gel.
The gas drainage pipe is a high-pressure PE pipe, and the distance between the gas drainage pipe and the top plate and the wall of the side wall are respectively 0.3 m.
The drain pipe is 0.3m away from the bottom plate.
Still include gas sampling tube, negative pressure survey beam tube, run through the setting in the sealed wall upper left corner, the body length that stretches out first wall side is 20 ~ 30 m.
Still including the PE high pressure fire prevention slip casting pipe with the valve, run through the setting on sealing wall upper portion, the body length that stretches out the first wall side of department is 20m, stretches out the length that the second wall side is 0.3 m.
The invention has the advantages that the sealing wall skin is not easy to fall off, the sealing effect is outstanding, and the gas accumulation amount at the upper part of the sealing wall is small.
The preparation method suitable for the preparation method of the sealing wall comprises the following steps: a preparation method of a coal mine underground sealing wall comprises the following steps,
step 1, cutting a first wall and a second wall at a construction site, wherein the depth of a side groove is 0.5m after the solid coal is seen, the depth of a top groove is 0.3m after the solid coal is seen, the depth of a bottom groove is 0.2m after the solid coal is seen, the thickness of the first wall and the thickness of the second wall are 0.5m, and the distance is 3m during cutting;
and 4, injecting a filling material between the first wall body and the second wall body through a grouting pipe to form a filling material layer, wherein the filling material is obtained by mixing cement and fly ash according to a weight ratio of 3:1 to obtain a mixture 1, filling gel into the mixture, wherein the weight of the gel is 10-13% of that of the mixture 1 to form a mixture 2, and mixing the mixture 2 with water according to a grey water ratio of 13-14: 10 mixing to prepare a filling material;
and 5, painting moisture-proof skin-removing layers on the outer side walls of the first wall body and the second wall body.
According to the manufacturing method, the filler of the middle filling material layer has the advantages of no toxicity, no corrosion and no pollution, and can play a good role in sealing and reduce the falling of the wall skin.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, a novel coal mine underground sealing wall comprises: the first wall body 3, the second wall body 5 that 0.5m is thick set up the filler layer 7 that 3m is thick between two wall bodies, and 5 outer wall upper portions of second wall body and roof junction are provided with arc firmware 8, and the arc firmware reduces ventilation resistance, reduces the gas and gathers. The outer surfaces of the first wall body and the second wall body are provided with the moisture-proof plastering layers, so that the problem that the wall plaster of the airtight wall is easy to be applied in a humid environment in the future is solved. The filling material is prepared by mixing cement and fly ash according to a weight ratio of 3:1 to obtain a mixture 1, filling gel into the mixture, wherein the weight of the gel is 10-13% of that of the mixture 1 to form a mixture 2, and mixing the mixture 2 with water according to a grey water ratio of 13-14: 10 mixing to prepare a filling material;
the first wall body and the second wall body are dug to a hard bottom in advance, the depth of the side groove is 0.5m after the solid coal is seen during the process of digging, the depth of the top groove is 0.3m after the solid coal is seen, the depth of the bottom groove is 0.2m after the solid coal is seen, the width of the digging groove is larger than the thickness of a wall by 0.3m, and skirt edges of not less than 0.1m are arranged around the first wall body and the second wall body during the process of plastering. When the wall is built, the wall is connected with the coal body firmly, and the wall ledge is filled with mortar tightly.
And a gas drainage pipe with the diameter of 110mm is reserved at the position 0.3m away from the top and the side of the left upper corner of the airtight wall. The pipeline uses high-pressure PE pipes (namely, two ends are provided with steel sleeves) to penetrate through the inner side and the outer side of the airtight wall, the pipe orifice at the outer side is 0.3-1 m away from the outer side wall surface of the second wall, a gate valve is arranged, and the pipe orifice at the inner side is 30-50 m away from the outer wall of the first wall.
A drain pipe with the diameter of 159mm is laid in the middle of the airtight wall at a distance of 0.3m from the bottom plate, and a U-shaped pipe and a valve are arranged at the end part of the drain pipe extending out of the second wall body.
2 pieces of 1.5m long phi 110mmPE grouting pipes are preset at the upper part of the second wall body at equal intervals, are 0.3m away from the top and 1.0m away from the side, are obliquely arranged, a grout outlet is tightly attached to a roadway roof, and a phi 25 spherical stop valve is arranged at the outer end of the second wall body for grouting.
A gas sampling tube and a negative pressure observation beam tube are additionally arranged at the position of the left upper corner of the airtight wall, which is 0.3m away from the top and the side of the airtight wall respectively, and the airtight wall extends out of the first wall by 20 m.
The sealed wall is provided with a phi 110mmPE high-pressure fireproof grouting pipe at a position 0.3m away from the top of the wall, a grout outlet is 20m away from the first wall, a grout inlet is 0.3m away from the second wall, and a valve is arranged.
When the underground sealing wall of the coal mine is constructed, railways, steel wire ropes, anchor nets and other metal objects which are easy to conduct electricity and lead to the inside of the sealing wall are completely cleaned, the conducting objects which lead to a sealing area cannot be left, and stray current is prevented from entering the sealing area. After the underground coal mine sealing wall is constructed, the coal body around the sealing wall is cemented.
Claims (9)
1. A colliery is sealing wall in pit which characterized in that: the sealing wall comprises a first wall body, a filling material layer, a second wall body, arc-shaped fixing parts, a gas drainage pipe, a drain pipe and a plurality of grouting pipes with ball valves, wherein the filling material layer is positioned between the first wall body and the second wall body, the arc-shaped fixing parts are arranged at the joint of the upper part of the outer wall of the second wall body and a top plate, two straight edges of the arc-shaped fixing parts are fixedly connected with the outer wall of the second wall body and the top plate respectively and have the same width as the sealing wall, moisture-proof coating layers are arranged on the outer surfaces of the first wall body and the second wall body, the upper parts of the first wall body and the second wall body extend into a coal seam of the top plate for 0.3m, the bottom of the first wall body and the second wall body extends into a coal seam of a bottom plate for 0.2m, the left part and the right part of the first wall body extend into a coal seam of; the water drainage pipe is arranged on the lower side of the middle part of the sealing wall and penetrates through the sealing wall body, and a U-shaped pipe is arranged at the end part of the water drainage pipe, which extends out of the side of the second wall body; the grouting pipes are obliquely arranged on the upper portion of the second wall body in a penetrating mode at equal intervals, and discharge ports of the grouting pipes are located at the top of the filling layer.
2. The coal mine underground sealing wall according to claim 1, characterized in that: the thickness of the filling material layer is 3 m.
3. The coal mine underground sealing wall according to claim 1, characterized in that: the thickness of the first wall body and the second wall body is 0.5 m.
4. The coal mine underground sealing wall according to claim 1, characterized in that: the filling material layer is a mixture of cement, fly ash and gel.
5. The coal mine underground sealing wall according to claim 1, characterized in that: the gas drainage pipe is a high-pressure PE pipe, and the distance between the gas drainage pipe and the top plate and the wall of the side wall are respectively 0.3 m.
6. The coal mine underground sealing wall according to claim 1, characterized in that: the drain pipe is 0.3m away from the bottom plate.
7. The coal mine underground sealing wall according to claim 1, characterized in that: still include gas sampling tube, negative pressure survey beam tube, run through the setting in the sealed wall upper left corner, the body length that stretches out first wall side is 20 ~ 30 m.
8. The coal mine underground sealing wall according to claim 1, characterized in that: still including the PE high pressure fire prevention slip casting pipe with the valve, run through the setting on sealing wall upper portion, the body length that stretches out the first wall side of department is 20m, stretches out the length that the second wall side is 0.3 m.
9. A preparation method of a coal mine underground sealing wall comprises the following steps,
step 1, cutting a first wall and a second wall at a construction site, wherein the depth of a side groove is 0.5m after the solid coal is seen, the depth of a top groove is 0.3m after the solid coal is seen, the depth of a bottom groove is 0.2m after the solid coal is seen, the thickness of the first wall and the thickness of the second wall are 0.5m, and the distance is 3m during cutting;
step 2, arranging arc-shaped fixing pieces at the top of the outer side wall of the second wall, obliquely arranging grouting pipes at equal intervals on the upper part of the second wall, and enabling grouting pipe grout outlets to be located between the first wall and the second wall and close to the center of the top;
step 3, arranging a drain pipe, a gas extraction pipe, a gas sampling pipe, a negative pressure observation beam pipe and a high-pressure fireproof grouting pipe on the first wall body and the second wall body in a penetrating manner;
and 4, injecting a filling material between the first wall body and the second wall body through a grouting pipe to form a filling material layer, wherein the filling material is obtained by mixing cement and fly ash according to a weight ratio of 3:1 to obtain a mixture 1, filling gel into the mixture, wherein the weight of the gel is 10-13% of that of the mixture 1 to form a mixture 2, and mixing the mixture 2 with water according to a grey water ratio of 13-14: 10 mixing to prepare a filling material;
and 5, painting moisture-proof skin-removing layers on the outer side walls of the first wall body and the second wall body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911340863.2A CN111005763A (en) | 2019-12-23 | 2019-12-23 | Coal mine underground sealing wall and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911340863.2A CN111005763A (en) | 2019-12-23 | 2019-12-23 | Coal mine underground sealing wall and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111005763A true CN111005763A (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911340863.2A Pending CN111005763A (en) | 2019-12-23 | 2019-12-23 | Coal mine underground sealing wall and preparation method thereof |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228153A (en) * | 2020-09-04 | 2021-01-15 | 贵州大学 | Protective wall for preventing coal and gas from being extruded |
| CN116291716A (en) * | 2023-04-26 | 2023-06-23 | 中矿地科技术研究院(江苏)有限公司 | Goaf sealing device is used in mine |
-
2019
- 2019-12-23 CN CN201911340863.2A patent/CN111005763A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228153A (en) * | 2020-09-04 | 2021-01-15 | 贵州大学 | Protective wall for preventing coal and gas from being extruded |
| CN116291716A (en) * | 2023-04-26 | 2023-06-23 | 中矿地科技术研究院(江苏)有限公司 | Goaf sealing device is used in mine |
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