AU2018278957A1 - Coal mine underground bag-shaped filling structure and method of using same - Google Patents
Coal mine underground bag-shaped filling structure and method of using same Download PDFInfo
- Publication number
- AU2018278957A1 AU2018278957A1 AU2018278957A AU2018278957A AU2018278957A1 AU 2018278957 A1 AU2018278957 A1 AU 2018278957A1 AU 2018278957 A AU2018278957 A AU 2018278957A AU 2018278957 A AU2018278957 A AU 2018278957A AU 2018278957 A1 AU2018278957 A1 AU 2018278957A1
- Authority
- AU
- Australia
- Prior art keywords
- truss girder
- bag
- rectangle
- sealing layer
- surface sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003245 coal Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 26
- 238000005304 joining Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 230000005477 standard model Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
-
- 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
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Foundations (AREA)
Abstract
Disclosed are a coal mine underground bag-shaped filling structure and a method of using the same. The bag-shaped filling structure includes: a truss girder wall, a bag-shaped structure surface sealing layer, and a bottom structure. The truss girder wall is formed by piling up truss girder frames, each truss girder frame is formed by joining truss girder cell assemblages which are consistent on four sides end to end, and each truss girder cell assemblage is formed by connecting multiple truss girder cells in parallel in a row. The truss girder cell is formed by a base which is a rectangle and four lateral faces which are triangles. The four triangles intersect at one point of which a projection on the rectangle of the base coincides with an intersection of the two diagonals of the rectangle, and the other two vertices of each triangle coincide with the corresponding vertices of the rectangle successively on the base. Each rectangle 1-1 has only one diagonal connection, and the rectangles of adjacent truss girder cells have opposite diagonal connection directions. The truss girder wall is fixedly sandwiched between an internal surface sealing layer and an external surface sealing layer of the bag-shaped structure surface sealing layer, and mounted on the bottom structure. The present invention has high strength and a standard model, thus accelerating the project and reducing the costs.
Description
COAL MINE UNDERGROUND BAG-SHAPED FILLING STRUCTURE
AND METHOD OF USING SAME
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a formed structure of a filling body used in backfill mining or gob-side entry retaining, and in particular, to a coal mine underground bagshaped filling structure and a method of using the same.
Description of Related Art
In coal mining industry, with regard to a filling material for gob-side entry retaining, a movable steel template is first selected as a structural body in China. Afterwards, as the technology develops, a flexible filling bag is used to replace the steel template, and is also used in a goaf filling method based on a super high-water material and applied in gob-side entry retaining using a high-water material, to serve as a filling structural body.
In engineering practice on site, after completion of forming a filling structure by using the flexible filling bag, a formed filling body will easily expand and deform under the pressure of top and bottom plates in the roadway, resulting in an unsatisfactory filling effect. Moreover, it is required to determine the size of the flexible filling bag before use according to on-site conditions of different coal mines, and on-site construction takes a long time due to the lack of a unified standard model.
SUMMARY OF THE INVENTION
To overcome the shortcomings in the prior art, the present invention provides a coal mine underground bag-shaped filling structure and a method of using the same. The bag-shaped filling structure has high strength and a standard model, and the method of using the bag-shaped filling structure can accelerate the project and reduce the costs.
Technical solutions used by the present invention to solve the technical problems are as follows:
A coal mine underground bag-shaped filling structure includes a truss girder wall, a bag-shaped structure surface sealing layer, and a bottom structure. The truss girder wall is formed by piling up truss girder frames, each truss girder frame is formed by joining truss girder cell assemblages which are consistent on four sides end to end, and each truss girder cell assemblage is formed by connecting multiple truss girder cells in parallel in a row. The truss girder cell is formed by a base which is a rectangle and four lateral faces which are triangles. The four triangles intersect at one point of which a projection on the rectangle of the base coincides with an intersection of the two diagonals of the rectangle, and the other two vertices of each triangle coincide with the corresponding vertices of the rectangle successively on the base. Each rectangle 1-1 has only one diagonal connection, and the rectangles of adjacent truss girder cells have opposite diagonal connection directions. The truss girder wall is fixedly sandwiched between an internal surface sealing layer and an external surface sealing layer of the bag-shaped structure surface sealing layer, and mounted on the bottom structure.
A method of using a coal mine underground bag-shaped filling structure includes the following operating steps: 1) leveling the foundation of an underground position in which the bag-shaped filling structure needs to be mounted, and then steadily placing a bottom structure; 2) fitting a truss girder cell assemblage into the bottom structure, and then successively mounting the truss girder cell assemblages in an encirclement manner to form a truss girder frame, and piling up multiple truss girder frames in tiers to finally form a truss girder wall; and 3) after the truss girder wall reaches and contacts a top plate of the coal seam, injecting a filling material through a preset injection port, and completing the whole process after solidification of the filling material.
The present invention provides a coal mine underground bag-shaped filling structure and a method of using the same. Compared with the prior art, the bag-shaped filling structure of the present invention is formed by assemblage of truss girder cells. Specifically, the truss girder cells are joined to form a truss girder cell assemblage, then the truss girder cell assemblages are connected end to end to form a truss girder frame, and finally, multiple truss girder frames are piled up to form a truss girder wall. The truss girder wall is disposed in a bag-shaped structure surface sealing layer and mounted on a bottom structure, thus finally forming the bag-shaped filling structure of the present invention. After a filling material is injected into the bag-shaped structure, the truss girder cells produce an outward expansion force under the force from the filling body on the top (namely, internally). Under the effect of tension of anchor rods or anchor cables internally across the truss girder wall, the truss girder cells apply an inward reaction force from the outside onto the inside. As a result, the outward expansion force and the inward reaction force cancel each other out. Finally, a formed structure of the filling body can be effectively prevented from expansion and deformation under the pressure. It can be seen that, the present invention provides a formed structure of a convenient filling body which has high strength and a standard model, thus facilitating popularization and efficient application of a gob-side entry retaining process and a backfill mining process, and further reducing the costs in application of the above processes in the coal mine industry.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is further described with reference to the accompanying drawings and embodiments.
FIG. 1 is a schematic structural diagram of a truss girder cell in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a truss girder cell assemblage in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a truss girder wall and a bag-shaped structure surface sealing layer in the embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a bottom structure in the embodiment of the present invention; and
FIG. 5 is a schematic structural diagram of the embodiment of the present invention in which anchor rods or anchor cables are added.
In the accompanying drawings:
1. Truss girder cell, 1-1. Rectangle, 1-2. Triangle, 2. Truss girder cell assemblage, 3. Truss girder wall, 4. Bottom structure, 4-1. Support leg, 4-2. Side groove, 5. Anchor rod or anchor cable, 6. Bag-shaped filling structure, 7. Internal surface sealing layer, 8. External surface sealing layer
DETAILED DESCRIPTION OF THE INVENTION
To make the objective, technical solutions, and advantages of the present invention clearer, the technical solutions of embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Apparently, the described embodiments are some rather than all of the embodiments of the present invention. Based on the described embodiments of the present invention, other embodiments acquired by persons of ordinary skill in the art without creative effort all belong to a protection scope of the present invention.
The present invention provides a coal mine underground bag-shaped filling structure, which includes a truss girder wall 3, a bag-shaped structure surface sealing layer, and a bottom structure 4. The truss girder wall 3 is formed by piling up truss girder frames, each truss girder frame is formed by joining truss girder cell assemblages 2 which are consistent on four sides end to end, and each truss girder cell assemblage 2 is formed by connecting multiple truss girder cells 1 in parallel in a row. The truss girder cell 1 is formed by a base which is a rectangle 1-1 and four lateral faces which are triangles 1-2. The four triangles 1-2 intersect at one point of which a projection on the rectangle 1-1 of the base coincides with an intersection of the two diagonals of the rectangle 1-1, and the other two vertices of each triangle 1-2 coincide with the corresponding vertices of the rectangle successively on the base. Each rectangle 1-1 has only one diagonal connection, and the rectangles of adjacent truss girder cells 1 have opposite diagonal connection directions. The truss girder wall 3 is fixedly sandwiched between an internal surface sealing layer 7 and an external surface sealing layer 8 of the bag-shaped structure surface sealing layer, and mounted on the bottom structure 4. In this way, the truss girder wall 3 and the bag-shaped structure surface sealing layer of the present invention are integrally assembled, to form a coal mine underground bagshaped filling structure in a composite template form. The finished product is directly built and applied underground as a standard part, facilitating the construction.
FIG. 1 to FIG. 5 are schematic structural diagrams of one preferred embodiment of the present invention.
Referring to FIG. 1, the base of the truss girder cell is a rectangle 1-1 having dimensions of 548 mm in length x 216 mm in width. The apex of the truss girder cell is directly above the center of its base, and the height of the truss girder cell from the apex to the rectangle 1-1 is 250 mm. The truss girder cell has four lateral faces which are triangles 1-2. The four triangles 1-2 intersect at one point of which a projection on the rectangle 1-1 of the base coincides with an intersection of the two diagonals of the rectangle 1-1, and the other two vertices of each triangle 1-2 coincide with the corresponding vertices of the rectangle 1-1 successively on the base. Each rectangle 11 has only one diagonal connection, and rectangles of adjacent truss girder cells 1 constituting a truss girder cell assemblage 2 have opposite diagonal connection directions. The truss girder cell may be, but is not limited to, a steel structure, and a higher-strength material may also be used.
Referring to FIG. 2, multiple truss girder cells 1 shown in FIG. 1 are arranged in a row and connected in parallel to form the truss girder cell assemblage 2. The truss girder cells in each row may be directly connected by welding, since the material selected herein is steel. When another lightweight composite material of a required strength is selected, the truss girder cells 1 are mutually connected by gluing. In order that an initial form of the structure is prominently shown, an assembled structure of six truss girder cells 1 is given herein. A standard template in the subsequent description is formed by combination of such structures. That is, the final template is created by piling up the structures in tiers, to form a wall, thus facilitating underground transportation. The templates are connected underground according to actual conditions, so as to finally achieve a filling purpose.
Referring to FIG. 3 and FIG. 4, based on the analysis of the foregoing two structures, a truss girder wall 3 shown in a structural diagram of FIG. 3 is finally formed after assembly. The truss girder wall 3 is formed by piling up truss girder frames, and the truss girder frame is formed by joining truss girder cell assemblages 2 which are consistent on four sides end to end. The truss girder wall 3 is fixedly sandwiched between an internal surface sealing layer 7 and an external surface sealing layer 8 of the bag-shaped structure surface sealing layer (as shown in FIG. 3). The truss girder wall 3 may be connected to the bag-shaped structure surface sealing layer by means of gluing or riveting, but other connection means applicable during actual production and use may also be included. In addition, the truss girder wall 3 is mounted on the bottom structure 4. In later engineering practice, a sealing material for the final product is only required to be impervious to water, smooth, flat, and rigid, such as rigid plastic or plywood.
As shown in FIG. 4, the bottom structure 4 is used for stably fixing the truss girder wall 3, and is a standard part. This structure may be specifically implemented as follows: the bottom structure 4 is provided with support legs 4-1 at the lower part and side grooves 4-2 respectively at two sides of the upper part. A lower groove is formed between the support legs 4-1, and the truss girder wall 3 is disposed in the side grooves 4-2 of the bottom structure 4. The disposition of the truss girder wall 3 in the side grooves 4-2 of the bottom structure 4 facilitates subsequent construction, which modifies an existing complicated process of building a net and mounting bags. In addition, the use of the bottom structure 4 as the bottom of a filling body prevents material leakage.
A method of using a coal mine underground bag-shaped filling structure includes the following operating steps:
1) It is determined, according to data actually measured on site, whether a standard bottom structure 4 provided currently is appropriate. If yes, a subsequent process is performed. If failing to meet the actual conditions, the size of the current standard bottom structure 4 is timely changed according to the on-site conditions.
2) The foundation of an underground position in which a bag-shaped filling structure needs to be mounted is leveled. Then, two corresponding trenches are excavated on the leveled foundation according to the position of a lower groove of the bottom structure 4 of the bag-shaped filling structure. Finally, the bottom structure 4 is steadily placed on the leveled foundation with the excavated trenches.
3) A truss girder wall 3 is built after the bottom structures are laid for a certain length. Specifically, a truss girder cell assemblage 2 in a first part is inserted into a side groove 4-2 of the bottom structure 4 in a manner that the truss girder cell assemblage 2 is exactly wedged into the side groove 4-2. Then, truss girder cell assemblages 2 are successively mounted in an encirclement manner to form a truss girder frame. Multiple truss girder frames are piled up in tiers to finally form a truss girder wall.
FIG. 5 shows a preferred design scheme of the present embodiment. Referring to FIG. 5, several anchor rods or anchor cables 5 are internally arranged across the bagshaped filling structure 6. During use of the bag-shaped filling structure 6, the number of the anchor rods or anchor cables 5 to be internally arranged is determined according to initially measured data and an anchor rod bearing capacity calculation formula generally used in coal mines, so as to meet the requirement on the strength of the filling body. The anchor rods or anchor cables 5 are added, on one hand, to provide an active force for a force and a reaction force between the filling body and the bag-shaped filling structure 6, such that all applications of the present invention can be met; on the other hand, to enhance the strength of the filling body, such that the filling body can resist the strong pressure from top and bottom plates in the coal seam so as to avoid expansion and deformation under the pressure.
The above merely describes preferred embodiments of the present application, but is not intended to limit the present application. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present application shall fall within the protection scope of the present application.
Claims (3)
- What is claimed is:1. A coal mine underground bag-shaped filling structure, comprising: a truss girder wall (3), a bag-shaped structure surface sealing layer, and a bottom structure (4), wherein the truss girder wall (3) is formed by piling up truss girder frames, each truss girder frame is formed by joining truss girder cell assemblages (2) which are consistent on four sides end to end, and each truss girder cell assemblage (2) is formed by connecting multiple truss girder cells (1) in parallel in a row; the truss girder cell (1) is formed by a base which is a rectangle (1-1) and four lateral faces which are triangles (1-2); the four triangles (1-2) intersect at one point of which a projection on the rectangle (1-1) of the base coincides with an intersection of the two diagonals of the rectangle (1-1), and the other two vertices of each triangle (1-2) coincide with the corresponding vertices of the rectangle (1-1) successively on the base; each rectangle (1-1) has only one diagonal connection, and the rectangles of adjacent truss girder cells (1) have opposite diagonal connection directions; and the truss girder wall (3) is fixedly sandwiched between an internal surface sealing layer (7) and an external surface sealing layer (8) of the bagshaped structure surface sealing layer, and mounted on the bottom structure (4).2. The coal mine underground bag-shaped filling structure according to claim 1, wherein the bottom structure (4) is a standard part, and is provided with support legs (4-1) at the lower part and side grooves (4-2) respectively at two sides of the upper part, a lower groove being formed between the support legs (4-1), and the truss girder wall (3) being disposed in the side grooves (4-2) of the bottom structure (4).3. The coal mine underground bag-shaped filling structure according to claim 2, wherein the bottom structure (4) has a length of 3000 mm and a width of1000 mm; and the side groove (4-2) on the long side has a width of 280 mm and a depth of 350 mm.4. The coal mine underground bag-shaped filling structure according to claim 3, wherein the rectangle (1-1) of the truss girder cell (1) has a length of 548 mm and a width of 216 mm, and the height from the top vertices of the triangles to the rectangle (1-1) is 250 mm.5. The coal mine underground bag-shaped filling structure according to any one of claims 1 to 4, wherein the truss girder cell (1) is a steel structure.6. The coal mine underground bag-shaped filling structure according to any one of claims 1 to 4, wherein the bag-shaped structure surface sealing layer is made from a material that is impervious to water, smooth, flat, and rigid.7. A method of using the bag-shaped filling structure described in claim 1, comprising the following operating steps:1) leveling the foundation of an underground position in which the bag-shaped filling structure needs to be mounted, and then placing a bottom structure (4);
- 2) fitting a truss girder cell assemblage (2) into the bottom structure (4), and then successively mounting the truss girder cell assemblages (2) in an encirclement manner to form a truss girder frame, and piling up multiple truss girder frames in tiers to finally form a truss girder wall (3); and
- 3) after the truss girder wall (3) reaches and contacts a top plate of the coal seam, injecting a filling material through a preset injection port, and completing the whole process after solidification of the filling material.8. The method of using the coal mine underground bag-shaped filling structure according to claim 7, wherein several anchor rods or anchor cables (5) are internally arranged across the bag-shaped filling structure (6).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711326312.1 | 2017-12-13 | ||
| CN201711326312.1A CN108301870B (en) | 2017-12-13 | 2017-12-13 | A kind of underground coal mine filling bag shaped structure and its application method |
| PCT/CN2018/090750 WO2019114224A1 (en) | 2017-12-13 | 2018-06-12 | Bag-shaped filling structure for underground coal mine and use method therefor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| AU2018278957A1 true AU2018278957A1 (en) | 2019-06-27 |
| AU2018278957B2 AU2018278957B2 (en) | 2019-08-29 |
| AU2018278957B8 AU2018278957B8 (en) | 2019-09-19 |
Family
ID=62869954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2018278957A Ceased AU2018278957B8 (en) | 2017-12-13 | 2018-06-12 | Coal mine underground bag-shaped filling structure and method of using same |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN108301870B (en) |
| AU (1) | AU2018278957B8 (en) |
| RU (1) | RU2704408C1 (en) |
| WO (1) | WO2019114224A1 (en) |
| ZA (1) | ZA201808355B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332008A (en) * | 2019-07-31 | 2019-10-15 | 邢萌 | Based on graphite-filled underground caving place structure and its fill method |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1804567A3 (en) * | 1991-04-10 | 1993-03-23 | Apдaшeb Kohctahtиh Apkaдьebич | Movable filling stopping |
| RU2160366C1 (en) * | 1999-06-03 | 2000-12-10 | Сибирский государственный индустриальный университет | Method of erection of artificial pillar |
| US8444108B2 (en) * | 2008-05-12 | 2013-05-21 | Kennedy Metal Products & Buildings, Inc. | Mine seal with electrically non-conductive ties |
| GB2485298B8 (en) * | 2009-07-23 | 2015-09-23 | Vision Modular Systems Uk Ltd | A structural module for construction of buildings |
| CN101705838A (en) * | 2009-11-05 | 2010-05-12 | 冀中能源邯郸矿业集团有限公司 | Separate type filling method of goaf |
| CN101975085B (en) * | 2010-09-09 | 2013-07-03 | 中国矿业大学 | Gob-side entry retaining reinforcing filling body structure construction method |
| CN202914107U (en) * | 2012-11-15 | 2013-05-01 | 华北科技学院 | Roadway support truss |
| CN103089298B (en) * | 2013-01-23 | 2014-11-19 | 中国矿业大学 | Structure and method for building side direction multicolumn gob-side entry retaining filling wall body |
| CN103603688B (en) * | 2013-09-25 | 2015-07-15 | 安徽理工大学 | Gob-side entry three-dimensional reinforcement filled wall structure and filling method thereof |
| WO2017024334A1 (en) * | 2015-08-12 | 2017-02-16 | Evolution Resource Group Pty Ltd | A method and an apparatus for creating a void, low-density fill or combination of void and low-density fill for underground mining comprising at least one module of formwork to be positioned in an open stope of an underground mine prior to carrying out a backfilling operation. |
| CN105937407B (en) * | 2016-06-22 | 2017-11-10 | 西安科技大学 | A kind of construction method of gob-side entry retaining concrete filling wall annular air-pocket |
| CN107013229A (en) * | 2017-05-26 | 2017-08-04 | 新疆大学 | Folding telescopic gob side entry retaining roadside packing Flexible formwork assembly and its construction method |
-
2017
- 2017-12-13 CN CN201711326312.1A patent/CN108301870B/en active Active
-
2018
- 2018-06-12 WO PCT/CN2018/090750 patent/WO2019114224A1/en active Application Filing
- 2018-06-12 AU AU2018278957A patent/AU2018278957B8/en not_active Ceased
- 2018-06-12 RU RU2018144939A patent/RU2704408C1/en active
- 2018-12-11 ZA ZA2018/08355A patent/ZA201808355B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU2018278957B2 (en) | 2019-08-29 |
| AU2018278957B8 (en) | 2019-09-19 |
| ZA201808355B (en) | 2020-02-26 |
| CN108301870A (en) | 2018-07-20 |
| CN108301870B (en) | 2019-06-11 |
| RU2704408C1 (en) | 2019-10-28 |
| WO2019114224A1 (en) | 2019-06-20 |
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| TH | Corrigenda |
Free format text: IN VOL 33 , NO 33 , PAGE(S) 4788 UNDER THE HEADING APPLICATIONS ACCEPTED - NAME INDEX UNDER THE NAME CHINA UNIVERSITY OF MINING AND TECHNOLOGY AND CHINA MINING&CIVIL NEW MATERIAL SCIENCE AND TECHNOLOGY LTD., APPLICATION NO. 2018278957, UNDER INID (72) CORRECT THE CO-INVENTOR TO ZHAO, TIANHAO |
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| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |