CN110284888A - It is applicable in the construction method of deep big Pass drawing secondary system reparation - Google Patents
It is applicable in the construction method of deep big Pass drawing secondary system reparation Download PDFInfo
- Publication number
- CN110284888A CN110284888A CN201910617150.XA CN201910617150A CN110284888A CN 110284888 A CN110284888 A CN 110284888A CN 201910617150 A CN201910617150 A CN 201910617150A CN 110284888 A CN110284888 A CN 110284888A
- Authority
- CN
- China
- Prior art keywords
- channel steel
- drop shaft
- applicable
- arcuate furrow
- secondary system
- 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
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 77
- 239000010959 steel Substances 0.000 claims abstract description 77
- 230000008439 repair process Effects 0.000 claims abstract description 17
- 239000011435 rock Substances 0.000 claims abstract description 10
- 230000004087 circulation Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000009510 drug design Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/06—Lining shafts; Linings therefor with iron or steel
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D7/00—Shaft equipment, e.g. timbering within the shaft
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/008—Driving transverse tunnels starting from existing tunnels
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)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Crushing And Grinding (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention relates to a kind of construction methods for being applicable in the big Pass drawing secondary system reparation of depth, it is transported for non-coal mine underground drop shaft, when vibration ore dumping machine failure needs to repair, since place drop shaft is deeper, the insecurity factors such as well head rock falls, rock of borehole is peeled off are likely to occur, drop shaft bottom is threatened to carry out personnel's personal safety of vibration ore dumping machine repair.Horizontal annular groove is dug above drop shaft storage mine section, and be inserted into arc channel steel and reinforced, in this, as impetus, closely it is laid with horizontal channel steel and forms baffle, stop to fall stone above drop shaft, it is ensured that personnel's personal safety of drop shaft bottom progress vibration ore dumping machine repair.After the completion of reparation, trapezoidal channel steel is withdrawn out, retain arc channel steel, close the outlet of measure lane, to be repaired in time when vibration ore dumping machine failure next time, shorten and repair the duration, reduce economic loss.
Description
Technical field:
The present invention relates to a kind of construction methods for being applicable in the big Pass drawing secondary system reparation of depth.
Background technique:
Vibration ore dumping machine is a kind of using vibrating motor as the top vibration shape inertial oscillation ore removal equipment of exciting source, is ore and other objects
The ideal equipment of the releasing of material, feed or entrucking.Since vibration ore dumping machine is located at drop shaft shaft bottom, the deep big general depth of drop shaft is more than
500m bears huge impact force for a long time and causes stop vibratory ore-drawing with powerful impact force when rock falls on shaft bottom under well head
Machine cracks, damages, failure etc., needs to repair in time.
But when vibration ore dumping machine failure needs to repair, since place drop shaft is deeper, worker is directly carried out in drop shaft shaft bottom
Vibration ore dumping machine repair, in fact it could happen that the insecurity factors such as well head rock falls, rock of borehole is peeled off seriously threaten work
The personal safety of personnel.
Summary of the invention:
The present invention has made improvements in view of the above-mentioned problems of the prior art, i.e., technical problem to be solved by the invention is to provide
A kind of construction method being applicable in the big Pass drawing secondary system reparation of depth, design rationally, can effective guarantee condition staff
Personal safety.
To achieve the goals above, the technical solution adopted by the present invention is that: one kind being applicable in deep big Pass drawing secondary system
The construction method of reparation, comprising the following steps:
Step S1: by the way of driling explosion, a ramp, as measure lane, measure lane are dug out of main haulage roadway
Outlet is located at the storage mine Duan Shangfang of drop shaft；
Step S2: using the mode of pneumatic pick rock drilling, respectively since the corner Liang Bang of measure lane exit, the inner wall along drop shaft is horizontal
Dig one section of arcuate furrow, the opening of arcuate furrow is towards drop shaft center；
Step S3: prefabricated several segments radius of curvature and the consistent arc channel steel of arcuate furrow outer diameter；
Step S4: the several segments channel steel that precast length does not wait, and at an angle by every section of channel steel both ends inclination processing, it is processed into
It is inscribed in the trapezoidal channel steel of arcuate furrow outer ring；
Step S5: taking two sections of arc channel steels, is put into arcuate furrow from measure lane exit two sides respectively, the opening of arc channel steel
Towards drop shaft center and it is close to palisades placement；
Step S6: choosing the trapezoidal channel steel of several segments, and Open Side Down and is closely laid with for the trapezoidal channel steel of several segments, every section of trapezoidal channel steel
Both ends are stuck in arcuate furrow, are maked somebody a mere figurehead in drop shaft；
Step S7: by all arc channel steels and it is trapezoidal be welded into an entirety, form firm workbench；
Step S8: continue to dig one respectively towards measure lane exit two sides on the workbench that construction personnel is formed in the step s 7
Section arcuate furrow；
Step S9: repeating the process of step S5 to step S8, until arcuate furrow closes up to form ring-shaped groove, entire workbench
The firm drop shaft section that is completely covered forms baffle；
Step S10: storage mine section ore is removed from drop shaft bottom, repairs vibration ore dumping machine；
Step S11: after the completion of vibration ore dumping machine is repaired, withdrawing out all trapezoidal channel steels, retain arc channel steel, closes measure lane and goes out
Mouthful.
Further, in step sl, the measure lane gradient is 16%, and the outlet in measure lane is located at 2m above storage mine section
Place, the exit in measure lane are equipped with the horizontal segment of 5m.
Further, in step s 2, the width of the arcuate furrow of cutting is 30cm, is highly 30cm, length 1m.
Further, in step s3, the arc length of the arc channel steel is 1m, radius of curvature 2.8m.
Further, in step s 4, the length of the trapezoidal channel steel of several segments is from 3.2m to 5.6m.
Further, in step s 8, the length for continuing the arcuate furrow dug is 1m.
Further, in step s 9, the construction of workbench is divided into multiple circulations, and each circulation is followed successively by cutting ditch
Slot is put into arc channel steel, is laid with trapezoidal channel steel and channel steel welding, and one cycle provides workbench for construction next time, by
Secondary expansion boundary of works area, until entire workbench is completely covered drop shaft section and forms baffle.
Compared with prior art, the present invention has the effect that the present invention has rational design, by storing up mine Duan Shangfang in drop shaft
Horizontal annular groove is dug, and is inserted into arc channel steel and is reinforced, it is close to be laid with horizontal trapezoidal channel steel shape in this, as impetus
At baffle, stop to fall stone above drop shaft, it is ensured that drop shaft bottom carries out personnel's person peace of vibration ore dumping machine repair
Entirely；After the completion of reparation, trapezoidal channel steel is withdrawn out, retain arc channel steel, close the outlet of measure lane, so as to vibration ore dumping machine next time
It can be repaired in time when failure, shorten and repair the duration, reduce economic loss.
Detailed description of the invention:
Fig. 1 is the organigram of the embodiment of the present invention；
Fig. 2 is the main view organigram for storing up baffle above mine section；
Fig. 3 is the side view organigram for storing up baffle above mine section；
Fig. 4 is the vertical view organigram for storing up baffle above mine section；
Fig. 5 is schematic diagram before trapezoidal channel steel is laid with；
Fig. 6 is schematic diagram before arc channel steel is laid with；
Fig. 7 is trapezoidal channel steel and arc channel steel process of deployment schematic diagram one；
Fig. 8 is trapezoidal channel steel and arc channel steel process of deployment schematic diagram two.
In figure:
1- drop shaft；2- measure lane；21- measure lane entrance；The outlet of 22- measure lane；23- horizontal segment；3- main haulage roadway；31- transport
Main entry outlet；The outlet of 32- main haulage roadway；4- baffle；41- ring-shaped groove；42- arc channel steel；The trapezoidal channel steel of 43-；5- stores up mine section；
The shaft bottom 6- funnel；7- vibration ore dumping machine.
Specific embodiment:
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
As shown in Fig. 1~8, a kind of construction method for being applicable in the big Pass drawing secondary system reparation of depth of the present invention, including with
Lower step:
Step S1: by the way of driling explosion, a ramp is dug out of main haulage roadway 3, as measure lane 2；Measure lane 2
The gradient is 16%, and the outlet 22 in measure lane 2 is located above the storage mine section of drop shaft at 2m, prevents high altitude operation and reduces measure lane
Project amount；5m horizontal segment 23 is stayed at the outlet 22 in measure lane, for temporarily placing material and facility；
Step S2: using the mode of pneumatic pick rock drilling, respectively since at measure lane outlet 22 two help corner, along the inner wall of drop shaft 1
Level digs one section of arcuate furrow, and the opening of arcuate furrow, for providing impetus, is spread towards drop shaft center convenient for subsequent horizontal
If channel steel；The width of arcuate furrow is 30cm, is highly 30cm, and length (arc length) is 1m；
Step S3: it is cut into the channel steel that several segment length are 1m using cutting machine in advance, veneer reeling machine is reused and is bent into channel steel
Arc forms arc channel steel 42, and it is 2.8m that the radius of curvature of arc channel steel 42 and the outer diameter of arcuate furrow are consistent；
Step S4: being cut into the length several segments channel steel not equal from 3.2m to 5.6m using cutting machine in advance, and by every section of channel steel
Both ends inclination processing at an angle, is processed into the trapezoidal channel steel 43 for being inscribed in arcuate furrow outer ring；
Step S5: the arc channel steel 42 for taking two sections of step S3 prefabricated, two sections of arc channel steels 42 are respectively from measure lane outlet 22
Two sides are put into arcuate furrow, and the opening of arc channel steel towards 1 center of drop shaft and is close to palisades placement；
Step S6: the prefabricated trapezoidal channel steel 43 of several segments step S4 is chosen, Open Side Down and close for the trapezoidal channel steel 43 of several segments
It is laid with, the both ends of every section of trapezoidal channel steel 43 are stuck in arcuate furrow, make somebody a mere figurehead in drop shaft 1；
Step S7: all arc channel steels 42 and trapezoidal weldering 43 are connected into an entirety, form firm workbench；
Step S8: continue to dig one respectively towards measure lane exit two sides on the workbench that construction personnel is formed in the step s 7
Section arcuate furrow, the length for continuing the arcuate furrow dug is 1m；
Step S9: repeating the process of step S5 to step S8, until arcuate furrow closes up to form ring-shaped groove 41, entire work is flat
Firm 1 section of drop shaft that is completely covered of platform forms baffle 4；
Step S10: storage mine section ore is removed from 1 bottom of drop shaft, repairs vibration ore dumping machine；
Step S11: after the completion of vibration ore dumping machine is repaired, withdrawing out all trapezoidal channel steels, retain arc channel steel, closes measure lane and goes out
Mouthful, to be repaired in time when vibration ore dumping machine failure next time, shorten and repair the duration, reduces economic loss.
In the present embodiment, the arc channel steel 42 is all made of No. 20 channel steels with trapezoidal channel steel 43.
In the present embodiment, in step s 9, since the length range of construction is limited, the construction of workbench is divided into multiple
Circulation, each circulation, which is followed successively by and digs groove, is put into arc channel steel, the trapezoidal channel steel of laying and channel steel welding, one cycle, is
Construction provides workbench next time, gradually expands boundary of works area, until entire workbench is completely covered drop shaft section and is formed
Baffle.
The present invention has the advantages that transported for non-coal mine underground drop shaft, when vibration ore dumping machine failure needs to repair, by
In place, drop shaft is deeper, in fact it could happen that the insecurity factors such as well head rock falls, rock of borehole is peeled off threaten drop shaft bottom to carry out
Personnel's personal safety of vibration ore dumping machine repair.Horizontal annular groove is dug above drop shaft storage mine section, and is inserted into arc
Channel steel is reinforced, and in this, as impetus, is closely laid with horizontal channel steel and is formed baffle, stops to fall stone above drop shaft,
Ensure that drop shaft bottom carries out personnel's personal safety of vibration ore dumping machine repair.After the completion of reparation, trapezoidal channel steel is withdrawn out, is protected
It stays arc channel steel, closes the outlet of measure lane, to be repaired in time when vibration ore dumping machine failure next time, shorten and repair
Duration reduces economic loss.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (7)
1. a kind of construction method for being applicable in the big Pass drawing secondary system reparation of depth, it is characterised in that: the following steps are included:
Step S1: by the way of driling explosion, a ramp, as measure lane, measure lane are dug out of main haulage roadway
Outlet is located at the storage mine Duan Shangfang of drop shaft；
Step S2: using the mode of pneumatic pick rock drilling, respectively since the corner Liang Bang of measure lane exit, the inner wall along drop shaft is horizontal
Dig one section of arcuate furrow, the opening of arcuate furrow is towards drop shaft center；
Step S3: prefabricated several segments radius of curvature and the consistent arc channel steel of arcuate furrow outer diameter；
Step S4: the several segments channel steel that precast length does not wait, and at an angle by every section of channel steel both ends inclination processing, it is processed into
It is inscribed in the trapezoidal channel steel of arcuate furrow outer ring；
Step S5: taking two sections of arc channel steels, is put into arcuate furrow from measure lane exit two sides respectively, the opening of arc channel steel
Towards drop shaft center and it is close to palisades placement；
Step S6: choosing the trapezoidal channel steel of several segments, and Open Side Down and is closely laid with for the trapezoidal channel steel of several segments, every section of trapezoidal channel steel
Both ends are stuck in arcuate furrow, are maked somebody a mere figurehead in drop shaft；
Step S7: by all arc channel steels and it is trapezoidal be welded into an entirety, form firm workbench；
Step S8: continue to dig one respectively towards measure lane exit two sides on the workbench that construction personnel is formed in the step s 7
Section arcuate furrow；
Step S9: repeating the process of step S5 to step S8, until arcuate furrow closes up to form ring-shaped groove, entire workbench
The firm drop shaft section that is completely covered forms baffle；
Step S10: storage mine section ore is removed from drop shaft bottom, repairs vibration ore dumping machine；
Step S11: after the completion of vibration ore dumping machine is repaired, withdrawing out all trapezoidal channel steels, retain arc channel steel, closes measure lane and goes out
Mouthful.
2. a kind of construction method for being applicable in the big Pass drawing secondary system reparation of depth according to claim 1, feature exist
In: in step sl, the measure lane gradient is 16%, and the outlet in measure lane is located at the outlet in measure lane above storage mine section at 2m
Place is equipped with the horizontal segment of 5m.
3. a kind of construction method for being applicable in the big Pass drawing secondary system reparation of depth according to claim 1, feature exist
In: in step s 2, it is highly 30cm that the width of the arcuate furrow of cutting, which is 30cm, length 1m.
4. a kind of construction method for being applicable in the big Pass drawing secondary system reparation of depth according to claim 1, feature exist
In: in step s3, the arc length of the arc channel steel is 1m, radius of curvature 2.8m.
5. a kind of construction method for being applicable in the big Pass drawing secondary system reparation of depth according to claim 1, feature exist
In: in step s 4, the length of the trapezoidal channel steel of several segments is from 3.2m to 5.6m.
6. a kind of construction method for being applicable in the big Pass drawing secondary system reparation of depth according to claim 1, feature exist
In: in step s 8, the length for continuing the arcuate furrow dug is 1m.
7. a kind of construction method for being applicable in the big Pass drawing secondary system reparation of depth according to claim 1, feature exist
In: in step s 9, the construction of workbench is divided into multiple circulations, and each circulation, which is followed successively by, digs groove, is put into arc groove
Steel is laid with trapezoidal channel steel and channel steel welding, and one cycle provides workbench for construction next time, gradually expands construction model
It encloses, until entire workbench is completely covered drop shaft section and forms baffle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910617150.XA CN110284888B (en) | 2019-07-10 | 2019-07-10 | Construction method suitable for secondary repair of ore drawing system of deep and large draw shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910617150.XA CN110284888B (en) | 2019-07-10 | 2019-07-10 | Construction method suitable for secondary repair of ore drawing system of deep and large draw shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110284888A true CN110284888A (en) | 2019-09-27 |
| CN110284888B CN110284888B (en) | 2020-06-12 |
Family
ID=68022087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910617150.XA Active CN110284888B (en) | 2019-07-10 | 2019-07-10 | Construction method suitable for secondary repair of ore drawing system of deep and large draw shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110284888B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU672347A1 (en) * | 1977-12-14 | 1979-07-05 | Криворожский Ордена Трудового Красного Знамени Горнорудный Институт | Safety device for deepening vertical mine shafts |
| RU2249697C1 (en) * | 2003-11-27 | 2005-04-10 | Еремин Георгий Михайлович | Method for open extraction of mineral resources deposits |
| JP2012026089A (en) * | 2010-07-20 | 2012-02-09 | Jfe Civil Engineering & Construction Corp | Lifting method and lifting device of work floor |
| WO2014070084A2 (en) * | 2012-11-02 | 2014-05-08 | Sapa Ab | Platform and methods for assembling and mounting in wind tower |
| JP2015094086A (en) * | 2013-11-11 | 2015-05-18 | 前田建設工業株式会社 | Lining concrete construction method of shaft, and platform for shaft |
| CN205189909U (en) * | 2015-11-24 | 2016-04-27 | 汶上义桥煤矿有限责任公司 | Mine is down with raising roof temporary support device |
| PL68642Y1 (en) * | 2014-05-19 | 2016-10-31 | Akademia Górniczohutnicza Im Stanisława Staszica W Krakowie | Artificial bottom of a mining shaft |
-
2019
- 2019-07-10 CN CN201910617150.XA patent/CN110284888B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU672347A1 (en) * | 1977-12-14 | 1979-07-05 | Криворожский Ордена Трудового Красного Знамени Горнорудный Институт | Safety device for deepening vertical mine shafts |
| RU2249697C1 (en) * | 2003-11-27 | 2005-04-10 | Еремин Георгий Михайлович | Method for open extraction of mineral resources deposits |
| JP2012026089A (en) * | 2010-07-20 | 2012-02-09 | Jfe Civil Engineering & Construction Corp | Lifting method and lifting device of work floor |
| WO2014070084A2 (en) * | 2012-11-02 | 2014-05-08 | Sapa Ab | Platform and methods for assembling and mounting in wind tower |
| JP2015094086A (en) * | 2013-11-11 | 2015-05-18 | 前田建設工業株式会社 | Lining concrete construction method of shaft, and platform for shaft |
| PL68642Y1 (en) * | 2014-05-19 | 2016-10-31 | Akademia Górniczohutnicza Im Stanisława Staszica W Krakowie | Artificial bottom of a mining shaft |
| CN205189909U (en) * | 2015-11-24 | 2016-04-27 | 汶上义桥煤矿有限责任公司 | Mine is down with raising roof temporary support device |
Non-Patent Citations (2)
| Title |
|---|
| 佚名: "溜井（双）单振动板放矿机安装工程", 《百度文库：HTTPS://WENKU.BAIDU.COM/VIEW/13621E1491C69EC3D5BBFD0A79563C1EC5DAD7A0.HTML?FROM=SEARCH》 * |
| 李承军等: "人工保护盘技术在立井井筒延深中的应用", 《煤矿开采》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110284888B (en) | 2020-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Mandal et al. | Evaluating extent and causes of overbreak in tunnels | |
| CN110374633B (en) | Tunnel opening section construction method for tunnel to pass through loose body | |
| TWI622692B (en) | Pile head treatment method | |
| CN107327306B (en) | Construction method for excavating superposed tunnels under urban shallow-buried condition | |
| CN110118084B (en) | Ultra-deep shaft construction method | |
| CN109209392A (en) | Loopful excavation method suitable for IV-V grade of country rock of large cross-section tunnel | |
| CN105423832B (en) | Blast construction method of orientation window of thick-wall brick chimney | |
| KR101889961B1 (en) | Excavation method for rock blasting having no-vibration | |
| WO2006054094A1 (en) | Method of breaking down concrete piles | |
| CN110284888A (en) | It is applicable in the construction method of deep big Pass drawing secondary system reparation | |
| CN103088832B (en) | Annular type impact method for digging rock at bottom of drilled pile shaft | |
| CN108222012A (en) | A kind of foundation pit anchor cable excision and the construction method that supporting pile is carried out using anchor cable excision system | |
| CN112412467A (en) | Construction method of ventilation vertical shaft of 200-600 m for super-long road tunnel by' reverse shaft method | |
| RU2461712C2 (en) | Development method of mineral deposits by drilling of large-diameter core | |
| CN113982639B (en) | Tunnel lining full-ring dismantling and replacing construction method in unfavorable geological region | |
| JP6868437B2 (en) | How to hang the surface of a concrete skeleton to a predetermined depth | |
| CN113654423B (en) | Green demolition method for mechanical cutting and remote blasting of pre-buried holes of reinforced concrete beam and column | |
| CN210163888U (en) | Quick construction structure of major diameter socketed pile | |
| JP6194223B2 (en) | Pile head processing jig and pile head processing method | |
| CN112459086A (en) | Construction method for cleaning top stone of steep side slope adjacent to existing line | |
| CN112696214B (en) | Tunnel construction method | |
| CN214836382U (en) | Roadway ecological supporting structure | |
| CA2064625C (en) | Method and apparatus for breaking a full face of rock for constructing mines and tunnels | |
| Ahmad et al. | Scheduling and Cost Estimation of Underground Work in Hydroelectric Project | |
| PRASANNA | STUDY AND REVIEW OF ADVANCE DEPILLARING METHODS USED IN CONTINUOUS MINER PANELS IN UNDERGROUND MINES |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |