US20080260472A1 - Resin Groutable Expansion Anchor and Method of Installing Same - Google Patents
Resin Groutable Expansion Anchor and Method of Installing Same Download PDFInfo
- Publication number
- US20080260472A1 US20080260472A1 US11/816,860 US81686006A US2008260472A1 US 20080260472 A1 US20080260472 A1 US 20080260472A1 US 81686006 A US81686006 A US 81686006A US 2008260472 A1 US2008260472 A1 US 2008260472A1
- Authority
- US
- United States
- Prior art keywords
- rock bolt
- shank
- borehole
- rock
- expansion
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229920005989 resin Polymers 0.000 title description 24
- 239000011347 resin Substances 0.000 title description 24
- 239000011435 rock Substances 0.000 claims abstract description 115
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 20
- 238000005755 formation reaction Methods 0.000 claims description 19
- 239000002775 capsule Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/14—Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor
- F16B13/141—Fixing plugs in holes by the use of settable material
- F16B13/143—Fixing plugs in holes by the use of settable material using frangible cartridges or capsules containing the setting components
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/0066—Anchoring-bolts formed by a bundle of radially arranged rigid elements
Definitions
- the present invention relates to rock bolts and methods for installing rock bolts and in particular to rock bolts which are used in combination with a cementing material.
- the invention has been developed primarily for rock bolts used in mining applications and will be described hereafter with reference to this application. However, it will be appreciated that the invention is not limited solely to mining applications.
- rock bolt There are three main types of rock bolt known for securing supporting structures in mine cavities.
- the first is a resin anchored rock bolt, which is installed in a borehole by inserting the bolt into the borehole, which contains a quick-setting resin compound. Once the resin is cured the bolt can be tensioned thereby to support the structure.
- the second type is a mechanically anchored rock bolt, which uses an expansion assembly located at the distal end of the rock bolt.
- the expansion assembly expands upon a forward rotation to anchor the rock bolt in a borehole.
- the third type is a combined mechanical and resin anchored rock bolt. This type uses a resin compound in combination with a mechanical expansion assembly to form an anchor with the advantages of both types mentioned above.
- this type of rock bolt is installed by first inserting a frangible capsule containing a resin compound into a borehole. The rock bolt is then inserted into the borehole to rupture the resin capsule. Once the resin is released, the bolt is further inserted into the borehole until the desired position is reached. A forward rotation is then applied to activate the expansion assembly thereby locking the rock bolt in the borehole whilst the resin cures.
- a disadvantage of this type of rock bolt is that during the insertion process, a user often has to axially reciprocate the bolt to sufficiently mix and distribute the resin compound such that the rock bolt forms a strong bond once the resin cures. As such, the time required to perform this reciprocation can add significantly to the installation cost.
- a rock bolt having:
- the expansion assembly includes an expansion shell having two or more longitudinally extending elongate expansion leaves for locking of the rock bolt in the borehole.
- the expansion shell is slidably engaged with the shank and is supported on the shank by an abutment member. More preferably, the abutment member is a nut threadedly engaged with the shank.
- the diameter of the expansion shell is substantially equal to the diameter of the rock bolt shank such that the cementing material flows more freely to the region of the rock bolt shank below the expansion shell.
- the expansion assembly includes a chuck in threaded engagement with the shank such that rotation of the rock bolt with respect to the chuck causes axial movement of the chuck, the chuck having surfaces in sliding keying engagement with complementary surfaces on the expansion leaves to cause outward divergent deformation of the leaves upon the relative forward rotation of the rock bolt.
- the chuck and expansion shell are preferably adapted for conjoined rotation.
- the stop means is a stop formation disposed at the distal end of the rock bolt shank. More preferably, the stop formation is a flange member fixedly connected to the rock bolt shank. Alternatively, the stop formation may be formed from a portion of the rock bolt shank and the distal end of the rock bolt may be pressed flat to define the stop formation.
- each leaf includes a plurality of gripping formations disposed on its outer surface for gripping engagement with the borehole.
- the chuck surfaces are tapered.
- the chuck includes one or more fluid flow passageways.
- a rock bolt of the first aspect in a borehole of a rock formation, including the steps of:
- a substantial portion of the rock bolt shank is encapsulated by the cementing material after step (ii).
- the reverse rotation mixes the cementing material.
- the frangible capsule in substantially shredded by the reverse rotation.
- the rock bolt head is substantially 50 mm away from the surface of the rock formation after step (ii).
- the cementing material is a two-part epoxy resin compound.
- FIG. 1 is a side view of a rock bolt according the present invention
- FIG. 2 is an enlarged view of the expansion assembly of the rock bolt of FIG. 1 shown releasably locked to the shank of the rock bolt;
- FIG. 3 is sectional view of another embodiment of the rock bolt of FIG. 1 , shown installed in a borehole.
- the rock bolt includes an elongate shank 1 and an expansion assembly 2 located at the distal end of the shank.
- the arrangement is such that the expansion assembly expands to lock the rock bolt in a borehole 3 in a rock formation upon relative forward rotation of the rock bolt.
- the illustrated rock bolt is used in combination with a two-part epoxy resin compound to secure the rock bolt in the borehole.
- a stop formation in the form of a pressed flat 4 is located at the distal end of the rock bolt shank 1 and is used to lock the expansion assembly with respect to the rock bolt for conjoined rotation upon a relative reverse rotation of the rock bolt, as best shown in FIG. 2 .
- the stop formation takes the form of a flange member fixedly connected to the distal end of the rock bolt.
- the expansion assembly 2 includes an expansion shell 5 having three longitudinally extending leaves 6 for locking the rock bolt in the borehole.
- Each leaf includes a plurality of gripping serrations 7 peripherally disposed about its outer surface, for gripping engagement with the borehole.
- the expansion shell 5 includes a clearance bore 8 for sliding engagement with a threaded portion 9 of the rock bolt shank 1 .
- a threaded nut 10 supports the expansion shell on the shank so that the expansion assembly 2 is retained at the distal end of the shank.
- the expansion assembly further includes a chuck 11 having a threaded bore 12 for threaded engagement with the shank 1 so that rotation of the rock bolt with respect to the chuck causes axial movement of the chuck.
- the chuck includes tapered surfaces 13 in sliding keying engagement with complimentary surfaces on the leaves 6 such that the axial movement of the chuck results in outward divergent deformation of the leaves upon relative forward rotation of the rock bolt. Moreover, engagement between the leaves and the tapered surfaces allows for conjoined rotation between the expansion shell and the chuck.
- the chuck 11 further includes fluid flow passageways 14 to allow the resin to flow through the chuck and onto the shank 1 .
- the expansion shell 5 has a diameter substantially equal to the diameter of the rock bolt shank 1 . Since the outer surface of the expansion shell is substantially in line with the outer surface of the rock bolt shank, the resin will flow more freely to the region below the expansion shell during installation.
- the borehole diameter is approximately equal to, or slightly less than, the diameter of the expansion shell so that rotational resistance is created between the periphery of the expansion shell and the borehole.
- a frangible resin capsule (not shown) is first inserted into the borehole.
- the rock bolt having been already inserted through the mining structure 15 to be supported, is then inserted into the borehole to rupture the resin capsule and allow the resin to flow out onto the assembly.
- the bolt is then rotated in a reverse direction, to initially cause the chuck 11 to move to abut the pressed flat 4 and thereby lock the expansion assembly with respect to the rock bolt for conjoined rotation.
- the rock bolt is then further inserted into the borehole by continued reverse rotation and upward axial force.
- the resin will flow from the area above expansion assembly 2 on to the shank 1 through the passageways 14 and around the periphery of the expansion shell. It will be appreciated that due to the expansion assembly being locked with respect to the rock bolt there is no risk of the expansion assembly disengaging the rock bolt during the reverse rotation.
- the reverse rotation insertion process continues to perform three main functions; firstly, to force the resin down the rock bolt thereby encapsulating a substantial portion of the shank 1 . Secondly, the locked expansion assembly efficiently mixes the two-part epoxy resin compound. Finally, the rotation of the expansion assembly 2 substantially shreds the frangible resin capsule.
- the rock bolt head 16 is rotated in a forward direction in the conventional manner to move the chuck axially away from the pressed flat and thereby expand the expansion assembly 2 to lock the rock bolt in the borehole.
- the illustrated rock bolt reduces installation times because the reverse rotation makes it easier to overcome the resistance of inserting the expansion assembly through the resin. Further, the resin compound is efficiently mixed and the resin capsule is substantially shredded during the insertion process, which also saves significantly on installation time.
Abstract
Description
- The present invention relates to rock bolts and methods for installing rock bolts and in particular to rock bolts which are used in combination with a cementing material. The invention has been developed primarily for rock bolts used in mining applications and will be described hereafter with reference to this application. However, it will be appreciated that the invention is not limited solely to mining applications.
- Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.
- There are three main types of rock bolt known for securing supporting structures in mine cavities. The first is a resin anchored rock bolt, which is installed in a borehole by inserting the bolt into the borehole, which contains a quick-setting resin compound. Once the resin is cured the bolt can be tensioned thereby to support the structure.
- The second type is a mechanically anchored rock bolt, which uses an expansion assembly located at the distal end of the rock bolt. The expansion assembly expands upon a forward rotation to anchor the rock bolt in a borehole.
- The third type is a combined mechanical and resin anchored rock bolt. This type uses a resin compound in combination with a mechanical expansion assembly to form an anchor with the advantages of both types mentioned above.
- Typically this type of rock bolt is installed by first inserting a frangible capsule containing a resin compound into a borehole. The rock bolt is then inserted into the borehole to rupture the resin capsule. Once the resin is released, the bolt is further inserted into the borehole until the desired position is reached. A forward rotation is then applied to activate the expansion assembly thereby locking the rock bolt in the borehole whilst the resin cures.
- A disadvantage of this type of rock bolt is that during the insertion process, a user often has to axially reciprocate the bolt to sufficiently mix and distribute the resin compound such that the rock bolt forms a strong bond once the resin cures. As such, the time required to perform this reciprocation can add significantly to the installation cost.
- Additionally, the axial insertion force required has been found to be excessive due to the fine clearance between the bore and the expansion assembly providing only a very small path for the resin to flow.
- It should be understood that during this insertion process, and before the rock bolt reaches its desired position, only minimal rotation may be applied. That is, a forward rotation causes the expansion assembly to immediately and irreversibly lock the rock bolt before it reaches its final position, and a reverse rotation will cause the expansion assembly to potentially disengage from the rock bolt shank.
- It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
- According to a first aspect of the invention there is provided a rock bolt having:
-
- an elongate shank;
- an expansion assembly at the distal end of the shank, the expansion assembly being expandable to lock the rock bolt in a borehole upon relative forward rotation of the rock bolt; and
- stop means to lock the expansion assembly with respect to the rock bolt for conjoined rotation upon a reverse rotation of the rock bolt.
- Preferably, the expansion assembly includes an expansion shell having two or more longitudinally extending elongate expansion leaves for locking of the rock bolt in the borehole.
- Preferably, the expansion shell is slidably engaged with the shank and is supported on the shank by an abutment member. More preferably, the abutment member is a nut threadedly engaged with the shank.
- Preferably, the diameter of the expansion shell is substantially equal to the diameter of the rock bolt shank such that the cementing material flows more freely to the region of the rock bolt shank below the expansion shell.
- Preferably, the expansion assembly includes a chuck in threaded engagement with the shank such that rotation of the rock bolt with respect to the chuck causes axial movement of the chuck, the chuck having surfaces in sliding keying engagement with complementary surfaces on the expansion leaves to cause outward divergent deformation of the leaves upon the relative forward rotation of the rock bolt. The chuck and expansion shell are preferably adapted for conjoined rotation.
- Preferably, the stop means is a stop formation disposed at the distal end of the rock bolt shank. More preferably, the stop formation is a flange member fixedly connected to the rock bolt shank. Alternatively, the stop formation may be formed from a portion of the rock bolt shank and the distal end of the rock bolt may be pressed flat to define the stop formation.
- Preferably, each leaf includes a plurality of gripping formations disposed on its outer surface for gripping engagement with the borehole.
- Preferably, the chuck surfaces are tapered.
- Preferably, the chuck includes one or more fluid flow passageways.
- According to a second aspect of the invention there is provided a method for installing a rock bolt of the first aspect in a borehole of a rock formation, including the steps of:
-
- (i) inserting a frangible capsule containing a cementing material into the borehole;
- (ii) inserting the rock bolt into the borehole until the capsule is ruptured and rotating in a reverse direction whilst applying an insertion force to further insert into the borehole; and
- (iii) rotating the bolt in a forward direction to expand the expansion assembly and thereby lock the rock bolt in the borehole.
- Preferably, a substantial portion of the rock bolt shank is encapsulated by the cementing material after step (ii).
- Preferably, the reverse rotation mixes the cementing material.
- Preferably, the frangible capsule in substantially shredded by the reverse rotation.
- Preferably, the rock bolt head is substantially 50 mm away from the surface of the rock formation after step (ii).
- Preferably, the cementing material is a two-part epoxy resin compound.
- Preferred embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which:
-
FIG. 1 is a side view of a rock bolt according the present invention; -
FIG. 2 is an enlarged view of the expansion assembly of the rock bolt ofFIG. 1 shown releasably locked to the shank of the rock bolt; and -
FIG. 3 is sectional view of another embodiment of the rock bolt ofFIG. 1 , shown installed in a borehole. - Referring to the drawings, the rock bolt includes an
elongate shank 1 and anexpansion assembly 2 located at the distal end of the shank. The arrangement is such that the expansion assembly expands to lock the rock bolt in aborehole 3 in a rock formation upon relative forward rotation of the rock bolt. As is common to the art, the illustrated rock bolt is used in combination with a two-part epoxy resin compound to secure the rock bolt in the borehole. - A stop formation in the form of a pressed
flat 4 is located at the distal end of therock bolt shank 1 and is used to lock the expansion assembly with respect to the rock bolt for conjoined rotation upon a relative reverse rotation of the rock bolt, as best shown inFIG. 2 . In another embodiment (not shown), the stop formation takes the form of a flange member fixedly connected to the distal end of the rock bolt. - The
expansion assembly 2 includes anexpansion shell 5 having three longitudinally extendingleaves 6 for locking the rock bolt in the borehole. Each leaf includes a plurality of grippingserrations 7 peripherally disposed about its outer surface, for gripping engagement with the borehole. - The
expansion shell 5 includes aclearance bore 8 for sliding engagement with a threadedportion 9 of therock bolt shank 1. A threadednut 10 supports the expansion shell on the shank so that theexpansion assembly 2 is retained at the distal end of the shank. - The expansion assembly further includes a chuck 11 having a threaded bore 12 for threaded engagement with the
shank 1 so that rotation of the rock bolt with respect to the chuck causes axial movement of the chuck. The chuck includes taperedsurfaces 13 in sliding keying engagement with complimentary surfaces on theleaves 6 such that the axial movement of the chuck results in outward divergent deformation of the leaves upon relative forward rotation of the rock bolt. Moreover, engagement between the leaves and the tapered surfaces allows for conjoined rotation between the expansion shell and the chuck. The chuck 11 further includes fluid flow passageways 14 to allow the resin to flow through the chuck and onto theshank 1. - In the embodiment shown in
FIG. 2 , theexpansion shell 5 has a diameter substantially equal to the diameter of therock bolt shank 1. Since the outer surface of the expansion shell is substantially in line with the outer surface of the rock bolt shank, the resin will flow more freely to the region below the expansion shell during installation. - Ideally, the borehole diameter is approximately equal to, or slightly less than, the diameter of the expansion shell so that rotational resistance is created between the periphery of the expansion shell and the borehole.
- As best shown in
FIG. 3 , to install the rock bolt into aborehole 3, a frangible resin capsule (not shown) is first inserted into the borehole. The rock bolt, having been already inserted through themining structure 15 to be supported, is then inserted into the borehole to rupture the resin capsule and allow the resin to flow out onto the assembly. The bolt is then rotated in a reverse direction, to initially cause the chuck 11 to move to abut the pressed flat 4 and thereby lock the expansion assembly with respect to the rock bolt for conjoined rotation. - The rock bolt is then further inserted into the borehole by continued reverse rotation and upward axial force. The resin will flow from the area above
expansion assembly 2 on to theshank 1 through the passageways 14 and around the periphery of the expansion shell. It will be appreciated that due to the expansion assembly being locked with respect to the rock bolt there is no risk of the expansion assembly disengaging the rock bolt during the reverse rotation. - The reverse rotation insertion process continues to perform three main functions; firstly, to force the resin down the rock bolt thereby encapsulating a substantial portion of the
shank 1. Secondly, the locked expansion assembly efficiently mixes the two-part epoxy resin compound. Finally, the rotation of theexpansion assembly 2 substantially shreds the frangible resin capsule. - Once the
rock bolt head 16 is approximately 50 mm away from the surface of the rock formation, it is rotated in a forward direction in the conventional manner to move the chuck axially away from the pressed flat and thereby expand theexpansion assembly 2 to lock the rock bolt in the borehole. - It will be appreciated that the illustrated rock bolt reduces installation times because the reverse rotation makes it easier to overcome the resistance of inserting the expansion assembly through the resin. Further, the resin compound is efficiently mixed and the resin capsule is substantially shredded during the insertion process, which also saves significantly on installation time.
- Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms. For example, it should be understood that many other suitable stopping formations may be used to perform the same function without departing from the scope of the invention.
Claims (22)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2005200804 | 2005-02-23 | ||
AU2005200804A AU2005200804B2 (en) | 2005-02-23 | 2005-02-23 | Improved resin groutable expansion anchor and method of installing same |
PCT/US2006/006393 WO2006091724A2 (en) | 2005-02-23 | 2006-02-23 | Resin groutable expansion anchor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080260472A1 true US20080260472A1 (en) | 2008-10-23 |
Family
ID=36928003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/816,860 Abandoned US20080260472A1 (en) | 2005-02-23 | 2006-02-23 | Resin Groutable Expansion Anchor and Method of Installing Same |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080260472A1 (en) |
CN (1) | CN101151437B (en) |
AU (1) | AU2005200804B2 (en) |
CA (1) | CA2599522A1 (en) |
WO (1) | WO2006091724A2 (en) |
ZA (1) | ZA200707108B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090114402A1 (en) * | 2005-06-07 | 2009-05-07 | Alwag Tunnelausbau Gesellschaft M.B.H. | Method and Device for Drilling, Particularly Percussion or Rotary Percussion Drilling ,a Hole in Soil or Rock Material |
US20090220309A1 (en) * | 2005-11-09 | 2009-09-03 | Sandvik Intellectual Property Ab | Self Drilling Rock Bolt |
US20140079496A1 (en) * | 2012-09-20 | 2014-03-20 | Robert Cousineau | Self-undercut expansion anchor insertion system |
US20150204152A1 (en) * | 2012-04-12 | 2015-07-23 | DYWIDAG-Systerns International GmbH | Method for drilling holes in soil or rock material and for fixing an anchor in a borehole and apparatus therefor |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101672191B (en) * | 2009-10-12 | 2011-07-20 | 北京科技大学 | Mechanized method for installing resin anchor rod |
CN101787893A (en) * | 2010-03-24 | 2010-07-28 | 东北大学 | Novel resin bolt installer |
CN102678146A (en) * | 2012-04-20 | 2012-09-19 | 中南大学 | Quickly mounted efficient energy-absorbing mining anchor rod |
CN103291337B (en) * | 2013-05-29 | 2015-08-05 | 成都现代万通锚固技术有限公司 | There is the anchor pole of external expansion gear |
CN109297462B (en) * | 2018-11-09 | 2019-10-08 | 山东科技大学 | The observation device and method of base object model rock stratum dynamic settling amount are covered on goaf |
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US4162133A (en) * | 1977-09-21 | 1979-07-24 | The Eastern Company | Resin reinforced expansion anchor and method of installation |
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US4516886A (en) * | 1984-05-14 | 1985-05-14 | The Eastern Company | Combined resin-mechanical mine roof support anchor |
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US6742966B2 (en) * | 2001-01-12 | 2004-06-01 | James D. Cook | Expansion shell assembly |
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CN1046335C (en) * | 1993-04-16 | 1999-11-10 | 艾布特若夫有限公司 | Integrated drilling and rock bolting apparatus |
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-
2005
- 2005-02-23 AU AU2005200804A patent/AU2005200804B2/en not_active Ceased
-
2006
- 2006-02-23 CN CN2006800101114A patent/CN101151437B/en not_active Expired - Fee Related
- 2006-02-23 WO PCT/US2006/006393 patent/WO2006091724A2/en active Application Filing
- 2006-02-23 CA CA002599522A patent/CA2599522A1/en not_active Abandoned
- 2006-02-23 US US11/816,860 patent/US20080260472A1/en not_active Abandoned
-
2007
- 2007-08-22 ZA ZA200707108A patent/ZA200707108B/en unknown
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US3394527A (en) * | 1967-07-24 | 1968-07-30 | American Cyanamid Co | Reinforcing anisotropic non-homogeneous engineering structures |
US4162133A (en) * | 1977-09-21 | 1979-07-24 | The Eastern Company | Resin reinforced expansion anchor and method of installation |
US4194858A (en) * | 1978-09-25 | 1980-03-25 | The Eastern Company | Mine roof bolt anchor installation |
US4299515A (en) * | 1980-01-16 | 1981-11-10 | The Eastern Company | Rock reinforcement system |
US4413930A (en) * | 1980-11-21 | 1983-11-08 | Jennmar Corporation | Method and apparatus for combining resin bonding and mechanical anchoring of a bolt in a rock formation |
US4437795A (en) * | 1981-11-02 | 1984-03-20 | Birmingham Bolt Company | Mine roof anchor assembly |
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US4861197A (en) * | 1987-06-15 | 1989-08-29 | Jennmar Corporation | Roof bolt system |
US4865489A (en) * | 1988-08-08 | 1989-09-12 | Jennmar Corporation | Mine roof anchor having adjustable resin retaining washer |
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US5078547A (en) * | 1989-06-19 | 1992-01-07 | Jennmar Corporation | Expansion assembly for mine roof bolts |
US5244314A (en) * | 1991-06-27 | 1993-09-14 | Jennmar Corporation | Expansion assembly |
US5501551A (en) * | 1995-03-24 | 1996-03-26 | The Eastern Company | Mine roof expansion anchor, expansible shell element used therein and method of installation |
US5762451A (en) * | 1997-02-26 | 1998-06-09 | Jennmar Corporation | Multi-piece, split bail expansion anchor |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090114402A1 (en) * | 2005-06-07 | 2009-05-07 | Alwag Tunnelausbau Gesellschaft M.B.H. | Method and Device for Drilling, Particularly Percussion or Rotary Percussion Drilling ,a Hole in Soil or Rock Material |
US7874380B2 (en) * | 2005-06-07 | 2011-01-25 | “ALWAG” Tunnelausbau Gesellschaft m.b.H. | Method and device for drilling, particularly percussion or rotary percussion drilling, a hole in soil or rock material |
US20090220309A1 (en) * | 2005-11-09 | 2009-09-03 | Sandvik Intellectual Property Ab | Self Drilling Rock Bolt |
US7896580B2 (en) * | 2005-11-09 | 2011-03-01 | Sandvik Intellectual Property Ab | Self drilling rock bolt |
US20150204152A1 (en) * | 2012-04-12 | 2015-07-23 | DYWIDAG-Systerns International GmbH | Method for drilling holes in soil or rock material and for fixing an anchor in a borehole and apparatus therefor |
US20140079496A1 (en) * | 2012-09-20 | 2014-03-20 | Robert Cousineau | Self-undercut expansion anchor insertion system |
US9296050B2 (en) * | 2012-09-20 | 2016-03-29 | Robert Cousineau | Self-undercut expansion anchor insertion system |
Also Published As
Publication number | Publication date |
---|---|
CN101151437A (en) | 2008-03-26 |
ZA200707108B (en) | 2008-10-29 |
WO2006091724A3 (en) | 2007-06-21 |
CN101151437B (en) | 2011-05-18 |
WO2006091724A2 (en) | 2006-08-31 |
CA2599522A1 (en) | 2006-08-31 |
AU2005200804B2 (en) | 2012-10-11 |
AU2005200804A1 (en) | 2006-09-07 |
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