| Patents for E21D 21 - Anchoring-bolts for roof, floor, or shaft-lining protection (4,377) |
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| 04/24/2013 | CN103061791A Three-dimensional special type steel belt |
| 04/24/2013 | CN103061788A Loose broken tunnel top plate reinforcing and supporting method |
| 04/24/2013 | CN103061779A Novel mine tunnel supporting structure and construction method thereof |
| 04/24/2013 | CN102213102B Method for righting toppled brackets of large-inclined-angle working surface |
| 04/18/2013 | CA2792155A1 Rock bolt sealing system |
| 04/17/2013 | CN202883017U Online monitoring and pre-warning system for coal mine anchor cable stress |
| 04/17/2013 | CN202882968U Multi-anchoring-point anchor rod without resin |
| 04/17/2013 | CN202882967U Soft rock overhanging-combining rock bolt capable of stopping rotating reversely |
| 04/17/2013 | CN202882966U Recoverable soft rock self-tapping anchor rod |
| 04/17/2013 | CN202882965U Non-resin multi-anchor rock bolt capable of stopping rotation reversely |
| 04/17/2013 | CN202882964U Flexible non-return integral rotating non-resinous multiple-anchor-point anchor rod |
| 04/17/2013 | CN202882963U Slip casting anchor cable supporting plate |
| 04/17/2013 | CN202882962U Abnormal shape anchor cable supporting plate |
| 04/17/2013 | CN202882959U Rock bolting front canopy device of mine driving face |
| 04/17/2013 | CN202882943U Yielding type restrained concrete arc frame high-strength three-dimensional supporting and protecting system |
| 04/17/2013 | CN202882939U Deep soft rock roadway three-dimensional prestress wire backfilling support retaining and protecting system |
| 04/17/2013 | CN202881945U Grouting anchor-bolt-end type multistage stop-grouting plug |
| 04/17/2013 | CN202881942U Soft rock suspension-combination anchor rod |
| 04/17/2013 | CN103046941A Anchor cable yield device capable of realizing working load visualization |
| 04/17/2013 | CN103046940A Light cast steel tray |
| 04/17/2013 | CN103046548A Modified anti-floating anchor rod anchor head |
| 04/17/2013 | CN103046546A Detachable anchor cable and construction process thereof |
| 04/17/2013 | CN101711305B Plastic rock-bolt or dowel and method of manufacture of the same |
| 04/10/2013 | CN202866845U Deformation resisting anchor rope/anchor rod capable of detecting anchoring quality timely |
| 04/10/2013 | CN202866844U Resistance increasing deformed anchor rod or anchor cable anchoring quality monitoring device |
| 04/10/2013 | CN202866843U Tunnel surface convergence observation station |
| 04/10/2013 | CN202866842U Hydraulic pressure coupling anchor rod |
| 04/10/2013 | CN202866841U Pull and press coupling type high, strong and big deformation anchor rod |
| 04/10/2013 | CN202866840U Full-thread glass fiber composite hollow grouting anchor rod |
| 04/10/2013 | CN103038448A A rock bolt and an anchoring device |
| 04/10/2013 | CN103032088A Anchor rod for supporting coal mine underworkings |
| 04/10/2013 | CN103032087A Self-drilling type hollow grouting anchor rod and production method thereof |
| 04/10/2013 | CN103032075A Construction method for building ground inlet and outlet type shield tunnel |
| 04/10/2013 | CN102226405B Method for reinforcing working surface of loose and soft coal bed by utilizing nonmetal grouting anchor cable |
| 04/10/2013 | CN102003187B Construction method of under cutting excavation supporting of of deeply buried soft-rock large tunnel |
| 04/03/2013 | CN202851064U Roadway support protection and material conveying equipment |
| 04/03/2013 | CN202851031U Grouting anchor rod |
| 04/03/2013 | CN202851030U External injection type and expansion shell type hollow resin anchor bar |
| 04/03/2013 | CN202851029U Injection-type self-drilling hollow resin anchor bar |
| 04/03/2013 | CN202851028U Self-drilling and outside-pourable hollow resin anchored bolt |
| 04/03/2013 | CN202851027U Support system treating soft rock roadway floor heaves |
| 04/03/2013 | CN202851026U Laneway side supporting anchor rod |
| 04/03/2013 | CN103016037A Novel yielding anchor rod elastic round tray for displaying pre-tightening force and use method thereof |
| 04/03/2013 | CN103016036A Deep-shaft surrounding-rock grouting anchor cable and grouting method thereof |
| 04/03/2013 | CN103016035A Abdicating buffer energy-absorbing shock-proof anchor rod cable for coal mine |
| 04/03/2013 | CN103016034A Mining hollow grouting anchor cable |
| 04/03/2013 | CN103016033A Working face crossheading belt plate supporting device |
| 04/03/2013 | CN102322281B Tunnel quick-tunneling advance support integrated device |
| 04/03/2013 | CN102094662B Friction sleeve type large deformation anchor rod |
| 04/03/2013 | CN102086770B Cone resistive friction sleeve large-deformation anchor rod |
| 04/03/2013 | CN101970798B Improved sliding anchor |
| 04/02/2013 | CA2690301C A grouted friction stabiliser |
| 03/28/2013 | US20130078040 Apparatus and Methods for Underground Structures and Construction Thereof |
| 03/28/2013 | DE102007043621B4 Bohrungsabdichtung Bore seal |
| 03/28/2013 | DE10017761B4 Verwendung eines Rohrankers mit Profilierung Using a tubular anchor with profiling |
| 03/27/2013 | CN202832597U W-shaped anchoring agent sleeve |
| 03/27/2013 | CN202832596U Dynamic-static-combination intelligent early warning anchor rod |
| 03/27/2013 | CN202832595U Thick liquid blocking yielding tray for slip casting anchor rod or slip casting anchor cable |
| 03/27/2013 | CN202832594U Novel inflatable yielding prestressed grouting anchor rod |
| 03/27/2013 | CN202832593U Anchor rod anti-impact yielding component |
| 03/27/2013 | CN202832592U Mining self-adjusting anchor rope anchorage |
| 03/27/2013 | CN202832588U Injector for anchoring agent |
| 03/27/2013 | CN102996168A Device for comprehensively preventing one-ventilation and three-prevention accidents on tunneling working plane |
| 03/27/2013 | CN102996149A Support method for bolt-grouting composite crushing dynamic-pressure roadway soft rock roof by high-pre-stressed anchor cable |
| 03/27/2013 | CN102996148A High-ground stress soft rock highway tunnel supporting method |
| 03/27/2013 | CN102140925B Expansion type high-strength anchor rod |
| 03/26/2013 | US8403600 Drilling tool, a self-drilling rock bolt, a drill bit, an anchoring device for a self-drilling rock bolt, a shaft for a drilling tool and an end coupling for a drilling tool |
| 03/21/2013 | WO2012103561A3 Protective device for (rock) bolts and friction bolts |
| 03/21/2013 | DE102011083153A1 Ankerstange Anchor rod |
| 03/20/2013 | CN202810881U Novel expandable type yielding prestress grouting anchor cable |
| 03/20/2013 | CN202810880U Anchor bolt |
| 03/20/2013 | CN202810665U Anchor rod drill bit provided with working surfaces on the side |
| 03/20/2013 | CN102979559A Device for preventing one ventilation and three prevention accidents of driving face in comprehensive mode |
| 03/20/2013 | CN102979558A Device for preventing one ventilation and three prevention accidents of stope face in comprehensive mode |
| 03/20/2013 | CN102979557A Device for preventing one ventilation and three prevention accidents of driving face in comprehensive mode |
| 03/20/2013 | CN102979543A Support method for brittle failure of surrounding rocks of hard rock double-track tunnel by river in area of high stress |
| 03/20/2013 | CN102979542A Bolt-mesh-cable support technology |
| 03/20/2013 | CN102979097A Weaving sleeve pipe type fiber reinforce plastic (FRP) rib and preparation method thereof |
| 03/20/2013 | CN102352884B Steel used for non-cold-working connection |
| 03/20/2013 | CN102296604B Constant-resistance large-deformation cable rope and constant-resistance device thereof |
| 03/14/2013 | WO2013033760A1 A tensionable cable bolt assembly |
| 03/13/2013 | CN202788894U Prestressing force measuring anchor stock |
| 03/13/2013 | CN202788893U Sealing device for high-pressure grouting anchor cable |
| 03/13/2013 | CN202788892U Anchor cable rod safety protection bush for mine |
| 03/13/2013 | CN202788891U Monomer steel strand anchor cable and orifice yielding device thereof |
| 03/13/2013 | CN202788890U Recyclable anchor rod and anchoring component |
| 03/13/2013 | CN202788889U Butt joint metal anchor rod |
| 03/13/2013 | CN202788888U Slip-casting anchor cable suitable for underground engineering reinforcement |
| 03/13/2013 | CN102966360A Method for reinforcing rock walls in neighborhood tunnel |
| 03/13/2013 | CN102966359A Working face ventilation oxidization zone roof control method |
| 03/13/2013 | CN101925721B Anchor tube and method for production thereof |
| 03/13/2013 | CN101463855B Protective element |
| 03/07/2013 | DE19712181B4 Bohrkrone Drill bit |
| 03/06/2013 | CN202770446U Quick anchoring convergence measuring point |
| 03/06/2013 | CN202768034U High-strength whole thread equal-strength resin anchor bar steel bar |
| 03/06/2013 | CN202768033U Injection type hollow resin bolting |
| 03/06/2013 | CN202768032U Three-dimensional anchor rope connecting device |
| 03/06/2013 | CN202768031U Hollow grouting anchor rod |
| 03/06/2013 | CN202768030U Integral yielding anchor rod system |
| 03/06/2013 | CN202768029U Combined anchor rod |