CN105370304B - High stress strong disturbance coal seam gob side entry retaining multistage reinforcement means - Google Patents
High stress strong disturbance coal seam gob side entry retaining multistage reinforcement means Download PDFInfo
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- CN105370304B CN105370304B CN201510887129.3A CN201510887129A CN105370304B CN 105370304 B CN105370304 B CN 105370304B CN 201510887129 A CN201510887129 A CN 201510887129A CN 105370304 B CN105370304 B CN 105370304B
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- entry retaining
- side entry
- gob side
- anchor pole
- coal seam
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- 239000003245 coal Substances 0.000 title claims abstract description 31
- 230000002787 reinforcement Effects 0.000 title claims abstract description 27
- 238000010276 construction Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 238000009415 formwork Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000005728 strengthening Methods 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000010878 waste rock Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000011435 rock Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 230000006378 damage Effects 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract description 2
- 238000009423 ventilation Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The present invention relates to the methods that a kind of high stress strong disturbance coal seam gob side entry retaining multistage is reinforced, it is particularly suitable for large mining depth, Complex Roof, the reinforcing of goaf gob side entry retaining when short distance high gas layer group exploits, each phase characteristic with destruction is distributed for gob side entry retaining surrouding rock stress, gob side entry retaining and fill area roof reinforcement is respectively adopted, construction filled wall is simultaneously reinforced, the methods of assistant reinforcement supporting and later period envelope benefit in lane, gob side entry retaining is set to be able to satisfy ventilation after final deformation, the safety in production such as pedestrian and next working face extraction need, guarantee the reliability and long-time stability of gob side entry retaining, reach scientific and reasonable, securely and reliably, easily construction, the good purpose of effect.
Description
Technical field
The present invention relates to high stress strong disturbance coal seam gob side entry retaining multistage reinforcement means, are particularly suitable for large mining depth, complexity
The reinforcing of goaf gob side entry retaining when top plate, short distance high gas layer group exploitation.
Background technique
For exploitation high-ground stress, thick-layer tight roof, coal seam group near interval is directly covered, due to tight roof working face " three
Band " extensively, is adopted strongly, and top plate cracks danger difficulty in advance, and laterally long outstanding push up causes high additional stress in goaf, filled wall carrying
Greatly, difficult in maintenance, closely-adjacent layer gas pressure relief pours in protective layer goaf, threatens the originals such as protective layer safety coal extraction
Cause, it is domestic at present not yet to carrying out the successful precedent without coal column gob side entry retaining under the conditions of such, therefore carry out it is such under the conditions of
It is great without coal column edge air gallery technology research significance.
The deformation of the surrounding rock in tunnel of gob side entry retaining not only depended on Overlying Strata In A Face activity, but also with the close phase of stress field of the surrounding rock
It closes.Overlying Strata In A Face activity stays stress field of the surrounding rock lane from tunneling to staying in lane to show apparent conditions of the current stage, each stage top
The plate characteristics of motion, stress Evolution, deformation characteristics are not quite similar.Therefore, gob-side entry retaining support structure control should be examined sufficiently
The phasic characteristics of the lane Lv Liu stress distribution and destructive characteristics take scientific and reasonable control technology means for different phase.
Summary of the invention
The object of the present invention is to provide the methods that a kind of high stress strong disturbance coal seam gob side entry retaining multistage is reinforced, for along sky
The distribution of lane surrouding rock stress and each phase characteristic destroyed are stayed, gob side entry retaining is respectively adopted and fill area roof reinforcement, construction are filled
It fills out wall and reinforces, the methods of assistant reinforcement supporting and later period envelope benefit in lane are able to satisfy gob side entry retaining after final deformation logical
The safety in production such as wind, pedestrian and next working face extraction need, and guarantee the reliability and long-time stability of gob side entry retaining, reach
The good purpose of scientific and reasonable, safe and reliable, easy construction, effect.
High stress strong disturbance coal seam gob side entry retaining multistage reinforcement means of the invention, includes the following steps:
A, gob side entry retaining is reinforced before back production, implements anchor pole spaced apart in gob side entry retaining top plate arrangement,
Each row and column anchor pole is used cooperatively steel band, forms roof timbering net；
B, the coal wall to 5.5~6.5m of first advance or so close to gob side entry retaining side carries out open gap construction, is formed
Fill area；
C, it in the top board construction anchor pole of fill area, is staggeredly arranged with the anchor pole of back, and is used cooperatively steel band, shape
At roof timbering net；
D, the gob side entry retaining within the scope of first advance 50m to working face rear 250m uses hydraulic prop and girder steel
Strengthening supporting.
E, it constructs filled wall, is first assembled using anchor pole by mold is filled in fill area, when assembling wears anchor pole
The corresponding hole in template is crossed, and exposes at least 50mm outside template；Then it is pumped using filling by the filling after adding water and stirring uniformly
Filling mold is removed in the filled Pipeline transport of material to filling mold, after material hardening to be filled, then respectively in filled wall
Steel band is both horizontally and vertically above arranged close to tunnel side, and is fixed steel band using the anchor pole being exposed at outside filled wall,
Form wall reinforcement net.
F, when top plate deforms, and gap occurs between filled wall top and top plate, filling waste rock etc. into gap
Material and air placed concrete packing cavity.
G, after gob side entry retaining is stablized, whitewashing processing is carried out at the top of tunnel and portion of side, envelope is mended on filled wall in time
Gap and crack.
Further, the roof timbering net is made of the anchor pole and the steel band, and the line space of anchor pole is
400mm-700mm；The long 1200mm-2100mm of steel band, width 150mm-200mm, thickness 10mm-20mm, are laid on two adjacent anchors
Between bar, and its both ends is fixed using anchor pole.
Further, the spacing of the hydraulic prop is 0.7m-1.5m, and the length of the girder steel is 1.5m-3.0m；
The hydraulic prop arranged forward by the way of two column of a beam with girder steel, three row's hydraulic prop of lateral arrangement,
A row is arranged in back production side at coal wall 0.4m-0.7m, successively arranges to non-back production side interval 1m-1.5m and 2m-2.5m two rows of.
Further, the filling mold is made of four pieces of rectangle templates and several anchor poles, in every piece of template
Even to be dispersed with the hole that spacing is 400mm-700mm, hole diameter is more than or equal to bolt diameter, every a line hole of adjacent forms
Not in same level, and same a line hole of opposite formwork corresponds to each other and in same level, utilizes four pieces of moulds
Anchor pole is passed through corresponding two circular cavities on two pieces of opposite formworks at the cabinet of a not no top and bottom by board group, and by anchor pole
Both ends are fixed, and guarantee that the both ends of anchor pole are all exposed at least 50mm outside template.
Further, the wall reinforcement net is equally made of the anchor pole and the steel band, and every three adjacent
A row or column anchor pole fix a steel band.
Further, the thickness of whitewashing described in step g is not less than 60mm.
Beneficial effects of the present invention are as follows:
(1) the method for the present invention is distributed according to gob side entry retaining surrouding rock stress and adds with each phase characteristic of destruction and corresponding construct
Solid method, it is scientific and reasonable, it securely and reliably, easily constructs, effect is good.
(2) after using roof timbering net to tunnel and fill area roof reinforcement, deep laneway surrounding rock can effectively be controlled
Deformation improves the distribution of tunnel-surrounding surrouding rock stress, improves its stability, has played the active support effect of anchor pole and anchor cable, together
When can also prevent when higher intensity has not been reached yet in filled wall since the absciss layer of top plate or inbreak are caused to filled wall
Destruction；
(3) by the strengthening supporting to working face front and back gob side entry retaining, the filled wall that can adequately protect will not be pressed
It is bad, and assistant reinforcement supporting is not only able to effective roof supporting in the lane at working face rear, is also worker at working face end
The construction of head provides safety guarantee；
(4) filled wall is poured using filling mold, not only increases the globality of filled wall, non-deformability and whole
Body intensity, and easy construction, fast speed；
(5) by that filled wall intensity can be made to be strengthened, filling is improved to filled wall construction wall reinforcement net
The integrated carrying ability of wall enables to resist biggish vertical load；
(6) by blocking the deficient bearing capacity for connecing head space gap, ensure that when wall sufficiently connects top above filled wall, benefit
Reinforcing envelope benefit tunnel top and portion of side with whitewashing reduces goaf air leaking conducive to the stability for improving tunnel.
Detailed description of the invention
Fig. 1 is assistant reinforcement supporting floor map in gob side entry retaining.
Fig. 2 is the A-A diagrammatic cross-section of Fig. 1.
Fig. 3 is the plan view of Fig. 2.
Fig. 4 is the structural perspective for filling mold.
Fig. 5 is the wall reinforcement net schematic diagram of filled wall.
In figure: 1- gob side entry retaining, 2- anchor pole, 3- steel band, 4- fill area, 5- hydraulic prop, 6- girder steel, 7- filling
Wall, the goaf 8-, 9- coal working face, 10- hydraulic support, 11- fill mold, 12- template, 13- hole.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawings and in conjunction with example:
High stress strong disturbance coal seam gob side entry retaining multistage reinforcement means of the invention, includes the following steps:
1) gob side entry retaining 1 is reinforced first before back production, implementing line space in the top plate arrangement of gob side entry retaining 1 is L1
The anchor pole 2 of=400mm-700mm, every row, each column anchor pole 2 are used cooperatively steel band 3, roof timbering net are formed, such as Fig. 2 and Fig. 3
It is shown；
2) coal wall to first advance 6m or so close to 1 side of gob side entry retaining carries out open gap construction, forms filling area
Domain 4 is staggeredly arranged then in the top board construction anchor pole 2 of fill area 4 with the anchor pole 2 of 1 top plate of gob side entry retaining, 2 line space of anchor pole
For L1, and it is used cooperatively steel band 3, forms roof timbering net, as shown in Figures 2 and 3.
3) gob side entry retaining 1 within the scope of 9 front L2=50m of coal working face to 9 rear L3=250m of coal working face
Will be using hydraulic prop 5 and 6 strengthening supporting of girder steel, the spacing of hydraulic prop 5 is 0.7m-1.5m, and 6 length of girder steel is
1.5m-3.0m arranges forward that three row's hydraulic prop 5 of lateral arrangement, back production side is close to coal by the way of " two column of a beam "
A row is arranged at wall L4=0.4m-0.7m, successively arranges two rows to non-back production side interval L5=1m-1.5m and L6=2m-2.5m,
As shown in Figure 1.
4) after completing above-mentioned work, filled wall 7 of constructing will fill 11 groups of mold using anchor pole 2 in fill area 4 first
Dress fixes, as shown in figure 4, anchor pole 2 to be passed through to the corresponding hole 13 in template 12 when assembling；Then will be added using filling pump
Filling mould is removed in the filled Pipeline transport of the filler of water after mixing evenly to filling mold 11, after material hardening to be filled
Tool 11, then steel band 3 is both horizontally and vertically above arranged close to tunnel side in filled wall 7 respectively, and is utilized and be exposed at filling wall
Anchor pole 2 outside body 7 fixes steel band 3, forms wall reinforcement net, as shown in Figure 5.
5) when top plate deforms, and gap occurs between 7 top of filled wall and top plate, into gap filling waste rock
Equal materials and air placed concrete packing cavity；After gob side entry retaining 1 is stablized, whitewashing processing is carried out at the top of tunnel and portion of side, and
When envelope mend gap and crack on filled wall 7, and guarantee shotcrete thickness not less than 60mm.
The roof timbering net is made of the anchor pole 2 and the steel band 3, steel band 3 is 1200mm-2100mm long,
Wide 150mm-200mm, thickness 10mm-20mm, are laid between two adjacent anchor poles 2, and fixed its both ends using anchor pole 2
Firmly.
The filling mold 11 is made of four pieces of rectangle templates 12 and several anchor poles 2, in every piece of template 12 uniformly
Be dispersed with spacing be 400mm-700mm hole 13,13 diameter of hole be more than or equal to 2 diameter of anchor pole, adjacent forms 12 it is each
Row hole 13 is not in same level, and same a line hole 13 of opposite formwork 12 corresponds to each other and in same level
On, the cabinet of a not no top and bottom is formed using four pieces of templates 12, anchor pole 2 is passed through corresponding on two pieces of opposite formworks 12
Two circular cavities 13, and 2 both ends of anchor pole are fixed, guarantee that the both ends of anchor pole 2 are all exposed at least 50mm outside template 12.
The wall reinforcement net is equally made of the anchor pole 2 and the steel band 3, every three adjacent a line or
One column anchor pole 2 fixes a steel band 3.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, the ordinary skill of this field
Personnel can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the spirit and scope of the present invention, this
The protection scope of invention should be subject to described in claims.
Claims (8)
1. high stress strong disturbance coal seam gob side entry retaining multistage reinforcement means, which comprises the steps of:
A, gob side entry retaining (1) is reinforced before back production, implements anchor spaced apart in the top plate arrangement of gob side entry retaining (1)
Bar (2), every row, each column anchor pole (2) are used cooperatively steel band (3), form roof timbering net；
B, the coal wall to advanced 5.5~6.5m of coal working face close to gob side entry retaining (1) side carries out open gap construction, and formation is filled
Fill out region (4)；
C, it in the top board construction anchor pole (2) of fill area (4), is staggeredly arranged, and matches with the anchor pole (2) of gob side entry retaining (1) top plate
It closes and uses steel band (3), form roof timbering net；
D, the gob side entry retaining (1) within the scope of advanced coal working face (9) 50m to coal working face (9) rear 250m is using single
Body hydraulic prop (5) and girder steel (6) strengthening supporting；
E, it constructs filled wall (7), it first will using four pieces of rectangle templates (12) and several anchor poles (2) in fill area (4)
Filling mold (11) assembling fixes, and is uniform-distribution with hole (13) on every piece of template (12), every a line of adjacent forms (12)
Hole (13) is not in same level, and same a line hole (13) of opposite formwork (12) corresponds to each other and in same level
On face, the cabinet of a not no top and bottom is formed using four pieces of templates (12)；Anchor pole (2) are passed through on template (12) when assembling
Corresponding hole (13)；Then using filling pump by the filled Pipeline transport of filler after adding water and stirring uniformly to filling mold
(11) in, filling mold (11) is removed after material hardening to be filled, then respectively in filled wall (7) close to tunnel side level and
Steel band (3) are arranged in vertical direction, and are fixed steel band (3) using the anchor pole (2) of filled wall (7) outside is exposed at, and form wall
Body reinforcing network；
F, it when top plate deforms, and gap occurs in filled wall (7) between top and top plate, filling waste rock and is sprayed into gap
Infuse concrete packing cavity；
G, after gob side entry retaining (1) stablizes, whitewashing processing is carried out at the top of tunnel and portion of side, envelope is mended on filled wall (7) in time
Gap and crack.
2. high stress strong disturbance according to claim 1 coal seam gob side entry retaining multistage reinforcement means, it is characterised in that: step
The line space of anchor pole (2) is 400mm-700mm in a and step c.
3. high stress strong disturbance according to claim 1 coal seam gob side entry retaining multistage reinforcement means, it is characterised in that: described
Roof timbering net be made of the anchor pole (2) and the steel band (3), the long 1200mm-2100mm of steel band (3), width
150mm-200mm, thickness 10mm-20mm are laid between two adjacent anchor poles (2), and are fixed its both ends using anchor pole (2)
Firmly.
4. high stress strong disturbance according to claim 1 coal seam gob side entry retaining multistage reinforcement means, it is characterised in that: described
The spacing of hydraulic prop (5) is 0.7m-1.5m, and girder steel (6) length is 1.5m-3.0m.
5. high stress strong disturbance according to claim 1 coal seam gob side entry retaining multistage reinforcement means, it is characterised in that: described
Hydraulic prop (5) arranged forward by the way of two column of a beam with girder steel (6), three row's hydraulic prop of lateral arrangement
(5), a row is arranged in back production side at coal wall 0.4m-0.7m, successively arranges to non-back production side interval 1m-1.5m and 2m-2.5m
It is two rows of.
6. high stress strong disturbance according to claim 1 coal seam gob side entry retaining multistage reinforcement means, it is characterised in that: every piece
The hole (13) that spacing is 400mm-700mm is uniform-distribution in template (12), it is straight that hole (13) diameter is more than or equal to anchor pole (2)
Diameter；When assembling, anchor pole (2) are passed through into corresponding two circular cavities (13) on two pieces of opposite formworks (12), and by anchor pole (2) both ends
It fixes, guarantees that the both ends of anchor pole (2) are all exposed template (12) at least 50mm outside.
7. high stress strong disturbance according to claim 1 coal seam gob side entry retaining multistage reinforcement means, it is characterised in that: described
Wall reinforcement net be made of the anchor pole (2) and the steel band (3), every three adjacent a row or column anchor poles (2)
Fix a steel band (3).
8. high stress strong disturbance according to claim 1 coal seam gob side entry retaining multistage reinforcement means, it is characterised in that: step
The thickness of whitewashing described in g is not less than 60mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510887129.3A CN105370304B (en) | 2015-12-07 | 2015-12-07 | High stress strong disturbance coal seam gob side entry retaining multistage reinforcement means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510887129.3A CN105370304B (en) | 2015-12-07 | 2015-12-07 | High stress strong disturbance coal seam gob side entry retaining multistage reinforcement means |
Publications (2)
| Publication Number | Publication Date |
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| CN105370304A CN105370304A (en) | 2016-03-02 |
| CN105370304B true CN105370304B (en) | 2018-12-18 |
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| CN201510887129.3A Active CN105370304B (en) | 2015-12-07 | 2015-12-07 | High stress strong disturbance coal seam gob side entry retaining multistage reinforcement means |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971608A (en) * | 2016-06-27 | 2016-09-28 | 六盘水师范学院 | Thick-coal-seam large-mining-height gob-side roadway retaining method |
| CN105909307A (en) * | 2016-06-27 | 2016-08-31 | 六盘水师范学院 | Low-coal-seam gob-side entry retaining method |
| CN109061108B (en) * | 2018-08-27 | 2022-05-27 | 山东大学 | Real three-dimensional geomechanics model test anchor rod pre-embedding device and operation method |
| CN109488353A (en) * | 2018-10-23 | 2019-03-19 | 新汶矿业集团有限责任公司 | A kind of stope advance support system and method |
| CN110863856A (en) * | 2019-12-02 | 2020-03-06 | 江西理工大学 | Road-entering type cemented filling plugging wall and construction method thereof |
| CN111173512B (en) * | 2020-01-17 | 2021-05-04 | 中北大学 | Gob-side entry retaining method for retained half lane |
| CN111485912B (en) * | 2020-03-31 | 2022-04-08 | 扬州中矿建筑新材料科技有限公司 | Gangue filling and cementing roadway retaining system and method |
| CN112431630B (en) * | 2020-10-27 | 2022-10-14 | 河南理工大学 | Resistance-increasing type large-deformation gob-side entry retaining roadside support structure and construction method |
| CN113553704A (en) * | 2021-07-13 | 2021-10-26 | 中煤科工集团北京土地整治与生态修复科技研究院有限公司 | Method for judging stability of roadway after completion of open pit control |
| CN113446051B (en) * | 2021-07-30 | 2022-07-29 | 太原理工大学 | Goaf ultrahigh-position drill hole gas extraction method under roof cutting and entry retaining process |
| CN113898373B (en) * | 2021-10-19 | 2023-10-13 | 辽宁工业大学 | FRP-PVC film shell internally filled with self-compaction gangue concrete fireproof combined coal column and reinforcing method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2168628C1 (en) * | 2000-03-20 | 2001-06-10 | Шахтинский институт Южно-Российского государственного технического университета (Новочеркасский политехнический институт) | Method of mining of stratified deposits |
| CN103061806B (en) * | 2012-12-28 | 2014-12-17 | 山东科技大学 | Composite roof thin seam fully-mechanized coal mining face gob-side entry retaining method |
| CN104265295B (en) * | 2014-09-11 | 2017-06-27 | 四川达竹煤电（集团）有限责任公司铁山南煤矿 | Medium Thickness And Medium Slope Angle coal seam prosthetic roadside packing and without coal column gob-side entry retaining method |
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Effective date of registration: 20160909 Address after: 467000 Pingdingshan City, Henan province miners Road, No. 21 Applicant after: Pingdingshan Tianan Coal Mining Co., Ltd. Applicant after: China University of Mining & Technology Applicant after: China Pingmei Shenma Energy Chemical Group Co., Ltd. Address before: 467000 Pingdingshan City, Henan province miners Road, No. 21 Applicant before: Pingdingshan Tianan Coal Mining Co., Ltd. Applicant before: China University of Mining & Technology |
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