CN111828093B - Enclosed wall - Google Patents
Enclosed wall Download PDFInfo
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- CN111828093B CN111828093B CN202010529780.4A CN202010529780A CN111828093B CN 111828093 B CN111828093 B CN 111828093B CN 202010529780 A CN202010529780 A CN 202010529780A CN 111828093 B CN111828093 B CN 111828093B
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- wall body
- flexible mold
- wall
- mold bag
- bag
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- 239000000463 material Substances 0.000 claims abstract description 77
- 239000004568 cement Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 230000002787 reinforcement Effects 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 14
- 238000010276 construction Methods 0.000 abstract description 12
- 239000003245 coal Substances 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 abstract description 5
- 238000009423 ventilation Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
Abstract
The invention relates to the technical field of coal mine controlled ventilation, in particular to a sealing wall, which comprises a filling wall body and two flexible mold bag wall bodies, wherein the two flexible mold bag wall bodies are sequentially arranged along the extension direction of a roadway and are parallel to each other, the filling wall body is positioned between the two flexible mold bag wall bodies, the filling wall body comprises a first material, the flexible mold bag wall body comprises a flexible mold bag and a second material, the flexible mold bag is filled with the second material, the first material and the second material have the same material composition, the water-cement ratio of the first material is 1-4, and the water-cement ratio of the second material is 1-1.2. The filling wall body and the flexible mold bag wall body are constructed by adopting the same materials but different material ratios, namely, the pumping of the filling wall body and the flexible mold bag wall body can be realized by adopting a double-liquid grouting pump, and the airtight wall which is simple in process, high in strength and good in airtightness can be constructed quickly. The problems that the explosion-proof airtight wall is labor-consuming and material-consuming in the former construction and poor in top contact and air leakage in the later use are solved.
Description
Technical Field
The invention relates to the technical field of coal mine control ventilation, in particular to a sealing wall.
Background
The sealing wall is a key technology for controlling ventilation of a coal mine, and is applied to occasions with requirements on ventilation control or gas management, such as underground roadway excavation, mining face arrangement, all production operations and the like. When the coal seam is explosive, an explosion-proof enclosure wall needs to be constructed. Therefore, the explosion-proof enclosure wall needs to have certain strength and impact resistance, and the surrounding rock deformation cannot leak air.
At present, the construction of a two-four and pseudo-ginseng brick wall or a stone wall is mainly adopted for constructing a closed wall, and loess is filled between wall frames, so that on one hand, labor and materials are wasted, the roof connecting effect is not ideal, when surrounding rocks deform, brittle materials such as bricks and stones break to generate cracks, and on the other hand, the filling process is complex, and the cracks can be generated by dehydration and shrinkage of the middle loess. Therefore, by adopting the mode of hanging the flexible mould bag and pouring concrete, the method solves the problem of low construction speed, but the concrete is still a brittle material, and the top joint part is still hidden trouble. Or the mode of hanging a flexible mould bag, pouring concrete and filling the foaming material is adopted, the foaming material is filled in the middle of the concrete wall, the sealing effect is achieved, however, a working procedure is added in the method, and meanwhile, the filling pump and the pouring pump are not of the same type, and the working procedure is complex. Or the method adopts the modes of hanging the flexible mold bag and pouring the high-water material and other flexible materials, solves the problem of brittle failure, but the high-water material has insufficient strength, so that the impact resistance is reduced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the sealing wall, the filling wall and the flexible mold bag wall are constructed by adopting the same materials but different material proportions, namely, the pumping injection of the filling wall and the flexible mold bag wall can be realized by adopting a double-liquid grouting pump, and the sealing wall which is simple in process, high in strength and good in sealing performance can be quickly constructed. The problems that the explosion-proof airtight wall is labor-consuming and material-consuming in the early construction, and is poor in top contact and air leakage in the later use are solved, and the transportation of materials in the early stage and the labor intensity of workers are reduced. The proportion of water and high-water materials is only changed, the construction is carried out by using the same process and materials, the labor organization is coordinated and convenient, the rapid construction of the airtight wall is realized, and the cost is further reduced and the efficiency is improved.
According to the embodiment of the first aspect of the invention, the enclosure wall comprises a filling wall body and two flexible mold bag wall bodies, wherein the two flexible mold bag wall bodies are sequentially arranged along the extending direction of a roadway and are parallel to each other, the filling wall body is positioned between the two flexible mold bag wall bodies, the filling wall body comprises a first material, the flexible mold bag wall body comprises a flexible mold bag and a second material, the flexible mold bag is filled with the second material, the first material and the second material have the same material composition, the water-cement ratio of the first material is 3.
According to one embodiment of the invention, the flexible mold bag wall is provided with a reinforcing member.
According to one embodiment of the invention, the reinforcing member comprises a steel plate, and the steel plate is arranged on the surface of the flexible mold bag wall.
According to one embodiment of the invention, the reinforcing member comprises a reinforced beam ladder, the reinforced beam ladder extends in the horizontal direction and is arranged on the surface of the flexible mold bag wall.
According to one embodiment of the invention, the reinforcing member comprises opposite-pulling anchor rods, the opposite-pulling anchor rods are arranged on the steel guard plate and the reinforced beam ladder, and the opposite-pulling anchor rods are inserted into the inner part of the flexible mold bag wall from the surface of the flexible mold bag wall.
According to one embodiment of the invention, the reinforcing member comprises a mesh reinforcement, and the mesh reinforcement is laid on the surface of the flexible mold bag wall.
According to one embodiment of the invention, the flexible mold bag type water-cooled roof is characterized by further comprising a pipe assembly, wherein the pipe assembly comprises a gas pipe, an observation pipe, a water return pipe, a filler pipe and an exhaust pipe, the filler pipe and the exhaust pipe both penetrate through the flexible mold bag wall body on one side of the filling wall body to the inside of the filling wall body, and the gas pipe, the observation pipe and the water return pipe penetrate through the flexible mold bag wall body on one side of the filling wall body to the outside of the flexible mold bag wall body on the other side of the filling wall body.
According to one embodiment of the invention, the width and the height of the flexible mold bag are larger than those of the undercut in which the wall of the flexible mold bag is located.
According to one embodiment of the invention, the flexible mold bag is provided with a lifting lug.
According to one embodiment of the invention, the flexible mold bag is provided with a pump nozzle.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects: the airtight wall provided by the embodiment of the invention comprises three layers of wall bodies, wherein the two sides of the airtight wall are flexible mold bag wall bodies, and the middle of the airtight wall is a filling wall body. Filling a second material into the flexible mold bags on two sides to form a wall body of the flexible mold bags, filling a first material into a vacant space between the two wall bodies of the flexible mold bags to form a filling wall body after the flexible mold bags are completely abutted, wherein the first material and the second material are formed by mixing water and a high-water material, and the water-cement ratio of the first material is 1-4, so that the material with expansibility and lower strength is formed, the filling wall body can have deformability in a certain range, a buffering and energy-absorbing effect is realized, and a 'yielding' function is realized; the water-cement ratio of the second material is 1-1.2, so that a material with high strength is formed, the flexible mold bag wall body is not easy to deform, a rigid bearing effect is achieved, and an anti function is realized, so that an airtight wall structure with the combined characteristics of anti-yielding and yielding is formed.
The sealing wall adopts the same material but different material proportions to construct the filling wall body and the flexible mold bag wall body, namely, the pumping of the filling wall body and the flexible mold bag wall body can be realized by adopting a double-liquid grouting pump, and the sealing wall with simple process, high strength and good sealing property can be quickly constructed. The problems that the explosion-proof airtight wall is labor-consuming and material-consuming in the early construction, and is poor in top contact and air leakage in the later use are solved, and the transportation of materials in the early stage and the labor intensity of workers are reduced. The proportion of water and high-water materials is only changed, the construction is carried out by using the same process and materials, the labor organization is coordinated and convenient, the rapid construction of the airtight wall is realized, and the cost is further reduced and the efficiency is improved.
In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions and the advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and the advantages brought by the technical features of the present invention will be further described with reference to the accompanying drawings or will be understood by the practice of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a sealing wall according to an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
fig. 4 is a schematic structural diagram of a flexible mold bag wall of a sealing wall according to an embodiment of the invention.
Reference numerals:
1: filling the wall;
2: a flexible mold bag wall; 21: a pump nozzle;
3: a reinforcement; 31: a steel guard plate; 32: a steel bar beam ladder; 33: oppositely pulling the anchor rod; 34: a reinforcing mesh;
4: a tube assembly; 41: a gas pipe; 42: an observation tube; 43: a water return pipe; 44: a filler tube; 45: an exhaust pipe;
5: lifting lugs;
6: and (6) cutting.
Detailed Description
Embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention may be understood as specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1, 2 and 3, the enclosure wall provided by the embodiment of the present invention includes a filling wall 1 and two flexible mold bag walls 2, the two flexible mold bag walls 2 are sequentially arranged along an extending direction of a roadway and are parallel to each other, the filling wall 1 is located between the two flexible mold bag walls 2, the filling wall 1 includes a first material, the flexible mold bag walls 2 include a flexible mold bag and a second material, the flexible mold bag is filled with the second material, the first material and the second material have the same material composition, the water-cement ratio of the first material is 1-4, and the water-cement ratio of the second material is 1-1.2.
The airtight wall of the embodiment of the invention consists of three layers of wall bodies, wherein the two sides are flexible mold bag wall bodies 2, and the middle part is a filling wall body 1. Filling a second material into flexible mold bags on two sides to form flexible mold bag walls 2, filling a first material into a vacant space between the two flexible mold bag walls 2 to form a filling wall 1 after the roof is completely connected, wherein the first material and the second material are formed by mixing water and a high-water material, and the water-cement ratio of the first material is 3; the water cement ratio of the second material is 1-1.2, and the material with higher strength is formed, so that the flexible mold bag wall body 2 is not easy to deform, plays a role in rigid bearing, realizes the function of 'resisting', and further forms a closed wall structure with the characteristics of 'resisting-letting' combination.
The sealing wall adopts the same material but different material proportions to construct the filling wall body 1 and the flexible mold bag wall body 2, namely, the pumping injection of the filling wall body 1 and the flexible mold bag wall body 2 can be realized by adopting a double-liquid grouting pump, and the sealing wall with simple process, high strength and good sealing property can be rapidly constructed. The problems that the explosion-proof airtight wall is labor-consuming and material-consuming in the early construction, and is poor in top contact and air leakage in the later use are solved, and the transportation of materials in the early stage and the labor intensity of workers are reduced. The proportion of water and high-water materials is only changed, the construction is carried out by using the same process and materials, the labor organization is coordinated and convenient, the rapid construction of the airtight wall is realized, and the cost is further reduced and the efficiency is improved.
In this embodiment, the flexible mold bag is made of mining flame-retardant cloth.
According to one embodiment of the invention, as shown in fig. 4, the wall body 2 of the flexible mold bag is provided with a reinforcing member 3. In this embodiment, reinforcement 3 is for protecting the surface component, provides further reinforcement protection for gentle mould bag wall body 2, improves its overall structure intensity. In one embodiment, the reinforcing member 3 may include a steel plate 31, a steel beam ladder 32, a counter-pull anchor 33, and a reinforcing mesh 34, which may be selected from one or more of any combination.
According to one embodiment of the invention, the reinforcing member 3 comprises a steel plate 31, and the steel plate 31 is arranged on the surface of the flexible mold bag wall body 2. In this embodiment, the reinforcement 3 includes the polylith steel backplate 31, and polylith steel backplate 31 is arranged in proper order along the horizontal direction, evenly arranges the surface at two gentle mould bag wall bodies 2 front sides and rear side, the surface that is perpendicular to the tunnel extending direction and not contact with filling wall body 1.
According to an embodiment of the present invention, the reinforcement 3 includes a reinforced beam ladder 32, and the reinforced beam ladder 32 extends in a horizontal direction and is disposed on the surface of the flexible mold pocket wall body 2. In this embodiment, reinforcement 3 includes many reinforcing beam ladders 32, and every reinforcing beam ladder 32 equal level sets up, and top-down evenly distributed is on the surface of two gentle mould bag wall body 2 front sides and rear sides.
According to an embodiment of the present invention, the reinforcement 3 includes counter-pull anchors 33, and the counter-pull anchors 33 are disposed on the steel sheathing 31 and the reinforced girder ladder 32 and inserted into the interior of the flexible mold bag wall 2 from the surface of the flexible mold bag wall 2. In this embodiment, reinforcement 3 still includes the multiunit anchor rod 33 of drawing to each other, the group number of drawing anchor rod 33 is corresponding with the radical of reinforced beam ladder 32 and the group number of steel backplate 31, a set of anchor rod 33 of drawing to each other fixes the position at a reinforced beam ladder 32 or a set of steel backplate 31, every group anchor rod 33 of drawing to each other includes many anchor rods 33 of drawing to each other, many anchor rods 33 of drawing to each other arrange apart the setting in proper order along reinforced beam ladder 32's extending direction, or many anchor rods 33 of drawing to each other set up with a plurality of steel backplate 31 one-to-one, the side of keeping away from filling wall body 1 from gentle mould bag wall body 2 inserts to this gentle mould bag wall body 2's inside.
According to one embodiment of the invention, the reinforcing member 3 comprises a mesh reinforcement 34, and the mesh reinforcement 34 is laid on the surface of the flexible mold bag wall body 2. In this embodiment, the reinforcing mesh 34 covers the front and rear surfaces of the two flexible molded bag walls 2. Mesh reinforcement 34 is a mesh reinforcement 34 having a wire diameter of 6 mm.
According to an embodiment of the present invention, the enclosure wall of the embodiment of the present invention further comprises a pipe assembly 4, wherein the pipe assembly 4 comprises a gas pipe 41, an observation pipe 42, a water return pipe 43, a filling pipe 44 and an exhaust pipe 45, the filling pipe 44 and the exhaust pipe 45 both penetrate through the flexible mold bag wall 2 on one side of the filled wall 1 to the inside of the filled wall 1, and the gas pipe 41, the observation pipe 42 and the water return pipe 43 penetrate through the flexible mold bag wall 2 on one side of the filled wall 1 to the outside of the flexible mold bag wall 2 on the other side. In this embodiment, the gas pipe 41, the observation pipe 42, and the water return pipe 43 are sequentially disposed from top to bottom on the enclosure wall, and the filler pipe 44 and the exhaust pipe 45 are disposed as close to the top plate of the roadway as possible. And one end of the filler pipe 44 penetrates through one flexible mold bag wall body 2 to enter a vacant space between the two flexible mold bag wall bodies 2, the other end of the filler pipe is connected with filling equipment, and after the flexible mold bag wall body 2 is constructed by grouting in the flexible mold bag, the filler pipe 44 is used for grouting between the two flexible mold bag wall bodies 2 to construct the filling wall body 1. The water return pipe 43, the observation pipe 42 and the gas pipe 41 respectively penetrate through the three layers of wall bodies, the water return pipe 43 is located in the range of 3/10-4/10 of the height of the airtight wall, and the water return pipe is obliquely arranged so that water can flow out of the inner side of the roadway to the outer side of the roadway conveniently. The observation tube 42 is located within a range of 3/5 of the height of the enclosure wall or more. The gas pipe 41 is located within a range of 5/6 of the height of the closing wall 2 or more.
In this example, the gas pipe 41 is a 4-inch steel pipe, the observation pipe 42 is a 4-inch steel pipe, and the return pipe 43 is a 6-inch steel pipe. The filler pipe 44 is a 2 inch steel pipe and the exhaust pipe 45 is a 2 inch steel pipe. In other embodiments, the diameters and lengths of the gas pipe 41, the observation pipe 42 and the water return pipe 43 are determined according to actual needs.
According to one embodiment of the invention, the width and height of the flexible mold bag are larger than the width and height of the undercut 6 in which the flexible mold bag wall 2 is located. In this embodiment, the enclosure wall sets up in the plunge cut 6, in the embedding plunge cut 6 of enclosure wall's periphery, the width and the height of gentle mould bag slightly are greater than width and height behind the plunge cut 6, and thickness is calculated according to tunnel pressure and gas coal seam explosion pressure and is confirmed. The cut 6 can be fully filled after the flexible mold bag wall body 2 is formed by grouting, and the problems of poor roof contact and air leakage in later use are avoided.
According to one embodiment of the invention, the flexible mold bag is provided with lifting lugs 5. In this embodiment, the gentle mould bag be close to the tunnel roof the surface and have all around to set up lug 5 for hang gentle mould bag, be convenient for construct the in-process of gentle mould bag wall body 2 at the slip casting and fix a position the firm gentle mould bag position.
According to one embodiment of the invention, the flexible mold bag is provided with a pump nozzle 21. In this embodiment, the last pump sprue 21 of having seted up of gentle mould bag, thereby through pump sprue 21 pump notes the second material in gentle mould bag and form gentle mould bag wall body 2, gentle mould bag wall body 2 meets a complete back, fills the vacant space formation of filling between two gentle mould bag walls through filler pipe 44 and fills wall body 1. The embodiment can adopt one double-liquid grouting pump to realize pumping of high-water materials with different proportions, and the process is simple.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A kind of airtight wall, its characterized in that: the flexible mold bag wall body is sequentially arranged along the extending direction of a roadway and is parallel to each other, the filling wall body is positioned between the two flexible mold bag wall bodies, the filling wall body comprises a first material, the flexible mold bag wall body comprises a flexible mold bag and a second material, the second material is filled in the flexible mold bag, the first material and the second material have the same material composition, the water-cement ratio of the first material is 1-4, and the water-cement ratio of the second material is 1-1.2; the wall body of the flexible mold bag is provided with a reinforcing member; the reinforcing member comprises a reinforcing mesh, and the reinforcing mesh is laid on the surface of the flexible mold bag wall; the reinforcement includes the steel backplate, the steel backplate set up in the surface of gentle mould bag wall body.
2. The containment wall of claim 1, wherein: the reinforcement includes the reinforcing bar roof beam ladder, the reinforcing bar roof beam ladder extends along the horizontal direction, and set up in gentle mould bag wall body's surface.
3. The containment wall of claim 2, wherein: the reinforcement includes to drawing the stock, to drawing the stock set up in the steel backplate with on the reinforcing bar roof beam ladder, certainly the surface of gentle mould bag wall body inserts the inside of gentle mould bag wall body.
4. The containment wall according to any one of claims 1 to 3, wherein: still include the pipe assembly, the pipe assembly includes gas pipe, observation pipe, return pipe, filled tube and blast pipe, the filled tube with the blast pipe by fill wall body one side gentle mould bag wall body run through to fill inside the wall body, the gas pipe observation pipe with the return pipe by fill wall body one side gentle mould bag wall body run through to the opposite side gentle mould bag wall body is outside.
5. The containment wall according to any one of claims 1 to 3, wherein: the width and the height of the flexible mold bag are larger than those of the cut where the wall of the flexible mold bag is located.
6. The containment wall according to any one of claims 1 to 3, wherein: the flexible mold bag is provided with a lifting lug.
7. The containment wall according to any one of claims 1 to 3, wherein: and a pump injection port is arranged on the flexible mold bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010529780.4A CN111828093B (en) | 2020-06-11 | 2020-06-11 | Enclosed wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010529780.4A CN111828093B (en) | 2020-06-11 | 2020-06-11 | Enclosed wall |
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| CN111828093A CN111828093A (en) | 2020-10-27 |
| CN111828093B true CN111828093B (en) | 2023-03-14 |
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| CN107448234A (en) * | 2017-08-30 | 2017-12-08 | 陕西煤业化工技术研究院有限责任公司 | A kind of colliery pours closed wall construction method |
| CN208137992U (en) * | 2017-12-26 | 2018-11-23 | 西安科技大学 | A kind of New Mine flame range flame proof fire dam |
| CN208294567U (en) * | 2018-05-15 | 2018-12-28 | 陕煤集团神木张家峁矿业有限公司 | A kind of fixation device for the soft mould pocket type mold pouring walling suitable for underground |
| CN208564631U (en) * | 2018-06-29 | 2019-03-01 | 神木汇森凉水井矿业有限责任公司 | It keeps out the wind wall device for the adjustable inflation of corner above and below fully-mechanized mining working |
| CN111018445A (en) * | 2019-12-27 | 2020-04-17 | 陕西煤业化工技术研究院有限责任公司 | Material for coal mine underground permanent airtight wall and airtight wall building method thereof |
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