| Patents for E21F 16 - Drainage (1,138) |
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| 03/20/2013 | CN202810936U Water draining plate for arched building |
| 03/20/2013 | CN202810935U Underground coal mine ditch assembly |
| 03/20/2013 | CN202810934U Slag removing device and water discharge device |
| 03/20/2013 | CN202810933U Downward drilling drainage system |
| 03/20/2013 | CN202810932U Automatic pumping and discharging device for accumulated water in stope pit |
| 03/20/2013 | CN202810931U 可视化放水装置 Visualization drainage device |
| 03/20/2013 | CN202810930U Water drain apparatus |
| 03/20/2013 | CN202810929U Inclined shaft drainage device |
| 03/20/2013 | CN202810928U Negative pressure U type water collecting and draining device of ventilation air methane delivery pipe |
| 03/20/2013 | CN202810912U Coal mine safe escape device |
| 03/20/2013 | CN202810904U Slag removal device |
| 03/20/2013 | CN102979575A Mine discharging device |
| 03/20/2013 | CN102979574A Caterpillar mine sump dredger |
| 03/20/2013 | CN102979573A Mine drainage device |
| 03/20/2013 | CN102979535A Drain-type pipe piece for tunnel lining |
| 03/13/2013 | CN202789467U Control system for metro drainage |
| 03/13/2013 | CN202788935U Drainage pipeline negative pressure automatic drainer |
| 03/13/2013 | CN202788934U Underground coal mine downward hole drainage device |
| 03/13/2013 | CN202788933U Negative pressure automatic water releaser |
| 03/13/2013 | CN102966376A Vacuum negative pressure quick unwatering method for ore body |
| 03/06/2013 | CN202768072U Coal slime cleaning and digging machine for underground coal mine water sump in small and medium size |
| 03/06/2013 | CN202767967U Self-circulation gas lift drainage gas recovery process device suitable for well outside station |
| 03/06/2013 | CN202767140U Coal slime cleaning and digging machine for underground coal mine water sump |
| 03/06/2013 | CN202767132U Rotary wing type slurry extraction device |
| 03/06/2013 | CN102954252A Water drainer |
| 03/06/2013 | CN102953757A Electric water distribution device of main water discharging pump room of coal mine |
| 03/06/2013 | CN102953751A Coal-mine vertical water coal rock powder treater |
| 02/27/2013 | CN202756019U Combined pipe seat of vertical-shaft shaft drain-pipe |
| 02/27/2013 | CN202756018U Blasthole drainage device |
| 02/27/2013 | CN202756017U Water discharging machine with slag discharged automatically |
| 02/27/2013 | CN102943691A Method for reducing silt coal slime in underground water sump of large water coal mine |
| 02/27/2013 | CN102943690A Method for preventing and treating separation layer water of top plate of coal face |
| 02/20/2013 | CN202745937U Hidden trench for concentrated seepage water guidance and drainage of existing tunnel in cold area |
| 02/20/2013 | CN202745936U Automatic water discharge device of gas extraction system |
| 02/20/2013 | CN202745935U Automatic tailrace |
| 02/20/2013 | CN202745934U Downward extraction borehole drainage device |
| 02/20/2013 | CN202745813U Mine well ventilation air and water drainage heat energy comprehensive utilization system |
| 02/20/2013 | CN102268994B Water supply system of composite earth pressure balance shield machine |
| 02/13/2013 | CN102926804A Distributed underground reservoir group and transfer method for mine water in distributed underground reservoir group |
| 02/13/2013 | CN102926803A Water drainage method for simultaneously exploiting water and coals under complicated hydrological condition |
| 02/13/2013 | CN102926802A Method for reducing silt coal by using underground water drainage tunnel of coal mine |
| 02/13/2013 | CN102926770A Underground draining and grouting process in thin bedrock and thick loose sand layer rich water areas |
| 02/13/2013 | CN102416984B Crawler type gallery emergency rescue drainage pump truck |
| 02/13/2013 | CN102135009B Automatic water discharging device |
| 02/13/2013 | CN102128046B Automatic water discharge device |
| 02/06/2013 | CN102913280A Method for draining roof water in flood mine |
| 01/30/2013 | CN102900465A Downward pumping and extracting hole drainage device |
| 01/30/2013 | CN102900367A Methods for drilling in cylinder of semi-finished vertical shaft and discharging water from cylinder of gangue-removal vertical shaft |
| 01/23/2013 | CN202690131U Tunnel water discharging system penetrating through long-lasting frozen soil areas and non-frozen soil areas |
| 01/23/2013 | CN202690130U Gas drainage automatic dewatering and deslagging device |
| 01/23/2013 | CN202690110U Box-shaped concrete side ditch siphonic water-collecting well capable of achieving fire extinguishing function |
| 01/23/2013 | CN202689055U Plastic drainage board with concave-convex ribs on sides of fulcrums |
| 01/23/2013 | CN102889098A Water discharging device of gas extraction pipeline |
| 01/16/2013 | CN202674418U Water-draining valve for flood gate of underground tunnel |
| 01/16/2013 | CN202673361U Drain control drilling pipeline for underground ore body |
| 01/16/2013 | CN202673360U Coal mine belt conveying and water draining monitoring system |
| 01/16/2013 | CN202673358U Mine filling body bleeding water pipe and bleeding system consists of mine filling body bleeding water pipe |
| 01/09/2013 | CN102865105A Mud discharging facility composed of water pump and mud discharging tank |
| 01/09/2013 | CN102865104A Downward extraction drilling drainage device |
| 01/09/2013 | CN102865103A Distributed using method for mine underground water |
| 01/09/2013 | CN102102530B Water drainage system and method based on downward drainage borehole |
| 01/08/2013 | CA2661725C Method and system for accessing subterranean deposits from the surface |
| 01/02/2013 | CN202649786U Automatic drainage centralized control device for mine |
| 01/02/2013 | CN202645621U Negative-pressure automatic water discharger |
| 01/02/2013 | CN202645585U Pipe piece lining structure for drainage and decompression |
| 01/02/2013 | CN202644615U Underground clean water storage machine for coal mine |
| 01/02/2013 | CN102854028A Plugging testing apparatus for water prevention and drainage system of undersea tunnel |
| 01/02/2013 | CN102852553A Sludge discharge equipment comprising vacuum pump and sludge discharge tank |
| 01/02/2013 | CN102852546A Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area |
| 01/02/2013 | CN102852530A Tunnel buffering multilayered water-discharging-preventing structure and construction method |
| 01/02/2013 | CN102162374B An anti-blocking device for a gob water drainage drill hole |
| 12/27/2012 | CA2839485A1 A method for constructing a tunnel course, and structural element for use by the method |
| 12/26/2012 | CN202628182U Full-automatic water drainer for gas extraction |
| 12/26/2012 | CN202628181U Gas extraction automatic water discharging device |
| 12/26/2012 | CN102839989A Deslagging device and water discharge device |
| 12/26/2012 | CN101775980B Quick drainage and hole sealing gas parameter testing system |
| 12/19/2012 | CN202611762U Structure of tunnel dredging and draining system |
| 12/19/2012 | CN202611761U Pull-type coal slime dredging machine |
| 12/12/2012 | CN202596787U Automatic drainage device of coal-mine gas extraction pipe |
| 12/12/2012 | CN102817366A Prevention and treatment method for full-mechanized caving mining collapse trap area water disaster for shallow-buried ultra-thick coal seam |
| 12/05/2012 | CN202578783U Bored decompression side-ditch centralized drainage structure for traffic tunnel |
| 12/05/2012 | CN202578782U Downcast pipe used for rich water powder fine sand layer |
| 12/05/2012 | CN202578755U Overall linking device of extraction pipelines |
| 12/05/2012 | CN102808652A Inherent karst tunnel drainage outburst prevention and hydrogeological environment protection method |
| 12/05/2012 | CN102808651A Automatic draining device of gas extraction system |
| 12/05/2012 | CN102808650A Mine filling body bleeding tube and formed bleeding system thereof |
| 12/05/2012 | CN102808647A Split full-automatic disaster prevention device of coal mine |
| 12/05/2012 | CN102808646A Upward-opening full-automatic disaster prevention device of coal mine |
| 12/05/2012 | CN102808645A Enhanced fully-automatic disaster plugging and preventing device for mine |
| 12/05/2012 | CN102808636A Supporting method of large-section tunnel in water-rich complicated geological mass |
| 12/05/2012 | CN102808628A Construction method of passage of large-section tunnel by water diversion fault |
| 12/05/2012 | CN102168581B Split precipitation type hanging scaffold water tank for automatic pollution discharge of vertical shaft |
| 11/28/2012 | CN202560320U Frost-damage preventing drainage system for tunnels |
| 11/28/2012 | CN202560319U Tunnel drainage and pressure reduction structure |
| 11/28/2012 | CN202560318U Water guide structure of laneway seal wall |
| 11/28/2012 | CN202560317U 自动放水器及瓦斯抽采系统 Automatically turn on the water and gas drainage system |
| 11/28/2012 | CN202560304U Draining and exhausting control device of mobile rescue capsule for coal mines |
| 11/28/2012 | CN202560301U Negative pressure automatic water-discharge device for coal-mine gas extraction pipeline |
| 11/28/2012 | CN202560300U 管路储放水装置及瓦斯抽采系统 Drainage pipe storage devices and gas drainage system |
| 11/28/2012 | CN202560299U Residue-removing drainage joint of gas pipeline |