EP2257690A1 - Korrosionsgeschützter selbstbohranker sowie ankerteileinheit und verfahren zu dessen herstellung - Google Patents
Korrosionsgeschützter selbstbohranker sowie ankerteileinheit und verfahren zu dessen herstellungInfo
- Publication number
- EP2257690A1 EP2257690A1 EP09721454A EP09721454A EP2257690A1 EP 2257690 A1 EP2257690 A1 EP 2257690A1 EP 09721454 A EP09721454 A EP 09721454A EP 09721454 A EP09721454 A EP 09721454A EP 2257690 A1 EP2257690 A1 EP 2257690A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- anchor
- tube
- subunit
- drilling
- hollow rod
- 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
- 238000005553 drilling Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000005260 corrosion Methods 0.000 claims abstract description 33
- 230000007797 corrosion Effects 0.000 claims abstract description 33
- 150000001875 compounds Chemical class 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 238000005253 cladding Methods 0.000 claims description 23
- 239000011083 cement mortar Substances 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 7
- 239000011324 bead Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 210000001503 joint Anatomy 0.000 abstract 5
- 239000011796 hollow space material Substances 0.000 abstract 2
- 238000009417 prefabrication Methods 0.000 abstract 1
- UNILWMWFPHPYOR-KXEYIPSPSA-M 1-[6-[2-[3-[3-[3-[2-[2-[3-[[2-[2-[[(2r)-1-[[2-[[(2r)-1-[3-[2-[2-[3-[[2-(2-amino-2-oxoethoxy)acetyl]amino]propoxy]ethoxy]ethoxy]propylamino]-3-hydroxy-1-oxopropan-2-yl]amino]-2-oxoethyl]amino]-3-[(2r)-2,3-di(hexadecanoyloxy)propyl]sulfanyl-1-oxopropan-2-yl Chemical compound O=C1C(SCCC(=O)NCCCOCCOCCOCCCNC(=O)COCC(=O)N[C@@H](CSC[C@@H](COC(=O)CCCCCCCCCCCCCCC)OC(=O)CCCCCCCCCCCCCCC)C(=O)NCC(=O)N[C@H](CO)C(=O)NCCCOCCOCCOCCCNC(=O)COCC(N)=O)CC(=O)N1CCNC(=O)CCCCCN\1C2=CC=C(S([O-])(=O)=O)C=C2CC/1=C/C=C/C=C/C1=[N+](CC)C2=CC=C(S([O-])(=O)=O)C=C2C1 UNILWMWFPHPYOR-KXEYIPSPSA-M 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 229940125773 compound 10 Drugs 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- ZLVXBBHTMQJRSX-VMGNSXQWSA-N jdtic Chemical compound C1([C@]2(C)CCN(C[C@@H]2C)C[C@H](C(C)C)NC(=O)[C@@H]2NCC3=CC(O)=CC=C3C2)=CC=CC(O)=C1 ZLVXBBHTMQJRSX-VMGNSXQWSA-N 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010016275 Fear Diseases 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0013—Protection against corrosion
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0053—Anchoring-bolts in the form of lost drilling rods
Definitions
- the invention relates to a corrosion-protected self-drilling anchor according to the preamble of patent claim 1, a method for its production according to independent claim 10 and a prefabricated anchor assembly according to independent claim 15.
- Soil and rock anchors as well as piles are used in civil engineering whenever it comes to inducing forces in the area of the anchor or pile head into deeper soil layers. This applies equally to anchor and nails loaded by tension and to piles loaded with pressure or tension.
- anchor, nails or piles on a support member which is brought in a wellbore with the surrounding ground in non-positive association and anchored at the air side end in the region of the head. Since the support members are usually made of steel, they are sensitive to corrosion.
- support members for temporary use and support members for permanent use, the latter use requires a design suitable for protection against corrosion constructive training.
- a double or increased corrosion protection is then spoken of when a passivation of the steel surface of the support member is ensured by injecting a cement mortar and an additional, the armature enveloping plastic tube is a diffusion barrier for liquids.
- Self-drilling anchors consist essentially of a number of Anchor rods with a continuous axial cavity. At the end of the first anchor rod, a drill bit with rinsing nozzles is arranged, which are connected via the continuous axial cavity with a drilling and Injizier affection at the air side anchor end.
- the extension of the self-drilling anchor after drilling a respective anchor rod is done by forming a Muffenschreibes. If a self-drilling anchor has reached its predetermined length, the resulting bore hole is injected with cement mortar through the axial cavity and, if appropriate, the anchorage is hardened after the injection material has hardened.
- the object of the invention is to further develop known self-drilling anchors, in order to make them suitable for permanent use even in a corrosion-prone environment.
- a further object of the invention is to specify a method and prefabricated anchor subunits for producing such an anchor.
- the invention provides a solution that ensures corrosion protection both in the area of the hollow rods and the joint area. This is achieved by an axially continuous combination of cladding and socket pipes, which represent a first barrier against externally coming, corrosion-causing substances.
- the cavity formed thereby to the hollow bar element is filled in each case with a corrosion protection compound, which forms the second barrier against corrosion, which is why it is spoken of a double corrosion protection.
- An anchor according to the invention therefore combines for the first time the advantages of a self-drilling anchor with the advantages of a double corrosion-protected anchor or pile.
- the cavity is filled up with a first anticorrosion compound which consists of a hardenable material, for example a mortar or a suspension based on cement or synthetic resin.
- a first anticorrosion compound which consists of a hardenable material, for example a mortar or a suspension based on cement or synthetic resin.
- the cavity filling consists of a second anticorrosion compound, which differs in its kind from the first anticorrosion compound and consists for example of a plastically deformable material such as grease and the like.
- an adapter is provided at the ends of the cladding tube, which already close the frontal openings of the cladding tubes close to the hollow bar during manufacture of the prefabricated anchor subunits and at the same time enables a tight connection of the sleeve tube.
- the adapter preferably has a cylindrical seat, on which the sleeve tube is axially plugged, wherein in the insertion region means for Position assurance and sealing of the sleeve tube may be arranged, for example in the form of a circumferential bead.
- the cladding tube and the adapter thus form a cavity surrounding the hollow, tightly closed cavity, which makes it possible to prefabricate by default pre-injecting this cavity with a hardenable anticorrosive Anchoring units as standard.
- a hardenable anticorrosive Anchoring units as standard.
- the adapters which act as a lost formwork, the end faces of the cavity are closed only temporarily for the Injiziervorgang and until the hardening of the suspension.
- Anchor Units offer the great advantage that can be produced under consistently optimal conditions and independent of climatic influences. This ensures a consistently high quality of the anchoring units produced in this way with a corresponding increase in quality in the finished self-drilling anchor.
- the anticorrosion composition within the cladding tube without regard to the subsequent pressing of the borehole can be specially adapted to the requirements of optimum corrosion protection, for example, by its particular composition and the manner of its introduction. For the pressing of the borehole after the anchor has been installed, then a likewise optimized for this application cement mortar can be used.
- a further preferred embodiment of the invention also has a drill bit with a nozzle with obliquely forwardly pointing outlet openings in the drilling direction.
- the pressure jet emerging from the nozzle loosens the substrate lying in front of the nozzle and can even loosen and crush it when high pressures are applied.
- the arrangement of a nozzle with a radial outlet opening can be provided. This results in the advantage that the loosened substrate for the drill bit can be solved more easily, so that as far as possible vibration-free propulsion is possible. This minimizes the risk of crack formation in the area of the pre-injected corrosion protection of the hollow bar anchor.
- FIG. 1 is a side view of a self-drilling anchor according to the invention, partly broken,
- FIG. 2 is a partial view of the Disposabled Harmonics shown in Fig. 1 in the region of the socket joint on a larger scale, partially broken,
- FIG. 3 shows a cross section through the subunit B shown in FIG. 1 along the village-shaped line III-III, FIG.
- FIG. 4 shows a cross section through the subunit B shown in FIG. 1 along the line IV - IV there, FIG.
- FIG. 5 shows a longitudinal section through the self-drilling anchor shown in FIG. 1 in the region of the drill bit, FIG.
- Fig. 6 is a side view of a self-drilling anchor according to the invention as
- FIGS. 7 a - f show the various method steps for producing an armature according to the invention.
- Fig. 1 an inventive self-drilling anchor 1 is shown in an overview, as it can be used advantageously in injectable soils for use.
- the armature 1 consists of two factory-prefabricated subunits A and B of essentially the same design, which are pushed together in a force-locking manner along the armature longitudinal axis 2.
- the length of units A and B can be as required vary between 1 m and 6 m.
- the structural design of the subunits A, B is also apparent from Figures 2, 3 and 4.
- a hollow rod member 3 which is provided over its entire length with an external thread 4 and which has an axial through hole 5 in the region of its longitudinal axis 2.
- the hollow bar element 3 is surrounded over its entire length, except for its end sections 3 ', 3 ", by a ribbed jacket tube 6.
- the two ends of the ribbed jacket tube 6 are connected tightly to the hollow bar 3 by means of the adapters 7.
- the adapter 7 has a connection piece 8, onto which the jacket tube 6 is pushed axially, and in the direction of the one end section 3 'a cylindrical seat 9, the jacket surface of which has a peripheral bead Hollow bar element 3 is factory completely filled with a first corrosion protection compound 10, for example with a curable injection mortar.
- B anchor 1 By frictional axial joining together a plurality of such prefabricated subunits A, B anchor 1 can be made of any length.
- the constructive training for achieving a corrosion protection mainly from Fig. 2 shows. There you can see the free end portions 3 'of two axially opposite hollow rod elements 3, which are connected by means of a screw sleeve 8 tensile and pressure-resistant together.
- the joint area is also surrounded over the entire length of the end portions 3 1 of a sleeve tube 12 which bears tightly against the cylindrical seat 9 of the adapter 7 with its ends while maintaining a slight axial play.
- the cavity between the sleeve tube 12 and the end portions 3 'of the hollow rods 3 and der Screw sleeve 11 is filled with a second anticorrosion compound 13, for example with a grease.
- a double corrosion protection is also present in the joint area, which is formed on the one hand by the diffusion-proof sleeve pipe 12 and on the other hand by the corrosion protection compound 13.
- Over the length of an armature according to the invention thus results in an alternating sequence of longitudinal sections, in which once the pre-injected with the first anticorrosion compound 10 sheath 6 provides corrosion protection and once the filled with the second anticorrosion compound 13 sleeve tube 12th
- the subunit A forms the beginning of an armature 1 according to the invention, wherein its end section 3 "assigned to the bottom of the hole is not intended to form a socket joint but to receive a drill bit 14. For this reason, the modified adapter T arranged at the end 3" does not have a cylindrical seat 9 on.
- the structural design of the drill bit 14 is shown in Fig. 5, after which it has a cylindrical body 15, to which a cone tip 16 connects to one side. From the lateral surface of the apex 16 extend blades 17 in the radial direction with cutting 18 for releasing and conveying the substrate. From the other side of the cylindrical body 15, starting in the transition region between the cylindrical body 15 and the apex 16 extends in the longitudinal axis 2, a blind bore 19 with internal thread into which the hollow rod 3 of the subunit A with its end 3 "is screwed.
- the drill bit 14 has a first injection nozzle 20, which extends from a bore perpendicular to the conical surface up to the blind bore 19, and a second nozzle 21, which is formed by a bore perpendicular to the cylindrical surface of the body 15, ie radially.
- a continuous cavity over the entire length of the armature 1 up to the nozzles 20 and 21 results.
- the subunit B forms the air-side end of the armature 1, so that here also the free end 3 "of the hollow rod 3 is not used to form a Muffenseses, but to form the air-side anchoring.
- an anchor plate 22 To the end portion 3 "is an anchor plate 22 is inserted, which is intended to support against the ground 25.
- a sealing tube 23 is fixedly connected to the underside of the anchor plate 22 and surrounds the Ripprohr 6 at a radial distance on the end portion 3" is finally screwed a cap nut 24, which is supported with its spherical peripheral surface on the anchor plate 22 and thus enables a tensioning of the armature 1.
- the cavity between sealing tube 23 and end section 3 "of hollow bar member 3 is also injected with a cement mortar.
- FIG. 7a shows the beginning of the production of an armature 1 according to the invention.
- a subunit A comprising a hollow bar element 3 with a drill bit 14 and a corrosion protection arranged behind it, consisting essentially of the ribbed tube 6 and the hardened anticorrosion compound 10 introduced therein at the factory. drilled with a drilling equipment not shown in the underground.
- scavenging air or rinsing liquid is transported through the through-hole 5 to the nozzles 20 and 21 at the tip of the armature 1 under high pressure to loosen and loosen the ground. The dissolved material is then flushed out between the cladding tube 6 and the borehole wall.
- Fig. 7b shows a state in which the borehole has reached a depth at which the subunit A projects substantially only with its end 3 1 from the borehole. is reached this state, a screw sleeve 11 is screwed with its half length on the end 3 ', so that the other half of the screw sleeve 11 is for receiving the hollow bar 3 another subunit B available.
- a corrosion protection compound 13 for example in the form of grease, is applied generously to the sleeve 11 and to the exposed areas of the end 3 1 of the hollow bar element 3, as shown in FIG. 7c.
- a new subunit for example, the subunit B described above, are screwed into the thus prepared end of the subunit A.
- the further subunit also has an already factory-made corrosion protection in the region of the cladding tube 6, as described above.
- a corrosion protection compound 13 is also previously applied to the free end 3 1 of the hollow bar member 3 of the unit B and then screwed into the screw sleeve 11.
- the sleeve tube 12 pushes with its free edge on the cylindrical seat 9 of the adapter 7 and thus forms a continuous and sealed connection of the ribbed sheaths 6 of the two subunits A and B.
- the borehole can, as already described under FIG. 7a, be advanced further. This condition is shown in Fig. 7e.
- the completion of the anchor 1 is effected by pressing the borehole, that is to say the annular gap between the enveloping tube 6 and the borehole wall Cement mortar and optionally by tensioning the anchor 1 after the cement mortar has hardened.
- FIG. 6 shows the use of a self-drilling anchor 26 according to the invention as a pile 30. Except for the air-side anchoring of the pile 30, the pile 30 has an identical construction to the anchor 1 described in FIGS. 1 to 5, so that the same reference symbols are used for the same features to avoid repetition to the local part of the description is referenced.
- an anchor plate 27 is fixed between a nut 28 and a lock nut 29 in a predetermined position. Since this area is completely enclosed at a later time by the concrete of the pile top plate, can be dispensed with a sealing tube.
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)
- Piles And Underground Anchors (AREA)
- Dowels (AREA)
- Joining Of Building Structures In Genera (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008014700A DE102008014700A1 (de) | 2008-03-18 | 2008-03-18 | Korrosionsgeschützter Selbstbohranker sowie Verfahren zu dessen Herstellung |
PCT/EP2009/001994 WO2009115307A1 (de) | 2008-03-18 | 2009-03-18 | Korrosionsgeschützter selbstbohranker sowie ankerteileinheit und verfahren zu dessen herstellung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2257690A1 true EP2257690A1 (de) | 2010-12-08 |
EP2257690B1 EP2257690B1 (de) | 2011-09-21 |
Family
ID=40756751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09721454A Not-in-force EP2257690B1 (de) | 2008-03-18 | 2009-03-18 | Korrosionsgeschützter selbstbohranker sowie ankerteileinheit und verfahren zu dessen herstellung |
Country Status (10)
Country | Link |
---|---|
US (1) | US8142109B2 (de) |
EP (1) | EP2257690B1 (de) |
AT (1) | ATE525549T1 (de) |
AU (1) | AU2009226749A1 (de) |
BR (1) | BRPI0910396A2 (de) |
CA (1) | CA2718556A1 (de) |
DE (1) | DE102008014700A1 (de) |
ES (1) | ES2374147T3 (de) |
PT (1) | PT2257690E (de) |
WO (1) | WO2009115307A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102269001A (zh) * | 2011-06-24 | 2011-12-07 | 江苏省矿业工程集团有限公司 | 锚杆防崩安全卡圈 |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
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US20080008553A1 (en) * | 2006-07-10 | 2008-01-10 | Robert Andrew Gillis | Self-drilling anchor screw and method of using the same |
AU2007214341B8 (en) * | 2007-08-31 | 2015-02-19 | Sandvik Intellectual Property Ab | Rock Bolt |
DE102010023627B4 (de) * | 2010-03-08 | 2012-07-26 | Markus Swoboda | Selbstbohranker |
DE102010043765B4 (de) * | 2010-11-11 | 2014-08-28 | Hilti Aktiengesellschaft | Ankerbaugruppe sowie Verfahren zur Herstellung einer Ankerbaugruppe |
CL2011000042A1 (es) | 2011-01-07 | 2011-06-17 | Sistema de fortificacion que comprende una barra helicoidal estandar, una cabeza de expansion adaptada a la rosca de la barra, un elemento de material plastico, un tubo de plastico corrugado, una placa de fortificacion estandar y una tuerca de fortificacion roscada segun el perno helicoidal que utiliza. | |
AT13228U1 (de) * | 2011-01-31 | 2013-08-15 | Atlas Copco Mai Gmbh | Schutzvorrichtung für (gebirgs-)anker und reibrohranker |
DE102011076592A1 (de) * | 2011-05-27 | 2012-11-29 | Hilti Aktiengesellschaft | Gesteinsanker |
CN103244158B (zh) * | 2013-05-08 | 2015-04-08 | 中国矿业大学 | 一种锚梁网一体化支护的强化结构 |
EP2927511A1 (de) * | 2014-04-01 | 2015-10-07 | HILTI Aktiengesellschaft | Schraube mit Masseauspresskolben |
CN104847354B (zh) * | 2015-04-03 | 2018-02-02 | 山东科技大学 | 一种利用注浆联合支护锚杆提升条带煤柱性能的方法 |
CN107820533B (zh) | 2015-05-08 | 2020-11-27 | 挪曼尔特国际有限公司 | 局部锚固的自钻式中空岩石锚杆 |
CN104988917B (zh) * | 2015-07-14 | 2016-08-31 | 浙江中桥预应力设备有限公司 | 一种高压旋喷式锚索置入器及其施工方法 |
CN105422150B (zh) * | 2015-11-23 | 2017-07-28 | 浙江工业大学工程设计集团有限公司 | 一种frp喷灌组合锚杆 |
CN109778850A (zh) * | 2019-01-24 | 2019-05-21 | 深圳市工勘岩土技术有限公司 | 预制式预应力锚杆施工方法 |
CN109853542B (zh) * | 2019-03-29 | 2023-11-28 | 厦门源昌城建集团有限公司 | 一种用于拉压复合型锚杆的防串浆套管接头及锚杆 |
CN112411617B (zh) * | 2020-11-23 | 2022-03-18 | 安徽华盛国际建筑设计工程咨询有限公司 | 一种垂直挡土结构及其施工方法 |
IT202200010868A1 (it) * | 2022-05-25 | 2023-11-25 | Dalla Gassa Srl | Ancoraggio dielettrico perfezionato per il consolidamento di terreni |
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US6817810B2 (en) * | 2002-12-03 | 2004-11-16 | Robert L. Jones | Piering device with adjustable helical plate |
EP1518976A1 (de) * | 2003-09-26 | 2005-03-30 | André Nicolet | Pfahl mit herausragenden Widerhaken |
CH693934A5 (de) * | 2003-10-09 | 2004-04-30 | Kuechler Ankertechnik Gmbh | Verfahren zum Bohren und Verfuellen von Loechern. |
RU2006118307A (ru) * | 2003-10-27 | 2007-12-10 | Атлас Копко Май Гмбх (At) | Анкерное устройство с эластичной расширяющейся оболочкой |
BRPI0618483A2 (pt) * | 2005-11-09 | 2011-08-30 | Sandvik Intellectual Property | parafuso auto-perfurador para rocha |
-
2008
- 2008-03-18 DE DE102008014700A patent/DE102008014700A1/de not_active Withdrawn
-
2009
- 2009-03-18 ES ES09721454T patent/ES2374147T3/es active Active
- 2009-03-18 EP EP09721454A patent/EP2257690B1/de not_active Not-in-force
- 2009-03-18 AU AU2009226749A patent/AU2009226749A1/en not_active Abandoned
- 2009-03-18 BR BRPI0910396A patent/BRPI0910396A2/pt not_active IP Right Cessation
- 2009-03-18 AT AT09721454T patent/ATE525549T1/de active
- 2009-03-18 WO PCT/EP2009/001994 patent/WO2009115307A1/de active Application Filing
- 2009-03-18 PT PT09721454T patent/PT2257690E/pt unknown
- 2009-03-18 CA CA2718556A patent/CA2718556A1/en not_active Abandoned
-
2010
- 2010-09-20 US US12/886,274 patent/US8142109B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2009115307A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102269001A (zh) * | 2011-06-24 | 2011-12-07 | 江苏省矿业工程集团有限公司 | 锚杆防崩安全卡圈 |
Also Published As
Publication number | Publication date |
---|---|
EP2257690B1 (de) | 2011-09-21 |
US20110070034A1 (en) | 2011-03-24 |
DE102008014700A1 (de) | 2009-09-24 |
BRPI0910396A2 (pt) | 2015-10-06 |
US8142109B2 (en) | 2012-03-27 |
CA2718556A1 (en) | 2009-09-24 |
PT2257690E (pt) | 2011-12-15 |
WO2009115307A1 (de) | 2009-09-24 |
ATE525549T1 (de) | 2011-10-15 |
AU2009226749A1 (en) | 2009-09-24 |
ES2374147T3 (es) | 2012-02-14 |
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