WO2007023363A1 - Boulon extensible - Google Patents

Boulon extensible Download PDF

Info

Publication number
WO2007023363A1
WO2007023363A1 PCT/IB2006/002291 IB2006002291W WO2007023363A1 WO 2007023363 A1 WO2007023363 A1 WO 2007023363A1 IB 2006002291 W IB2006002291 W IB 2006002291W WO 2007023363 A1 WO2007023363 A1 WO 2007023363A1
Authority
WO
WIPO (PCT)
Prior art keywords
rock bolt
projection
shaft
hollow shaft
end closure
Prior art date
Application number
PCT/IB2006/002291
Other languages
English (en)
Other versions
WO2007023363A8 (fr
Inventor
Pieter Schalk Mulder
Paul Eksteen
Original Assignee
Pieter Schalk Mulder
Paul Eksteen
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pieter Schalk Mulder, Paul Eksteen filed Critical Pieter Schalk Mulder
Publication of WO2007023363A1 publication Critical patent/WO2007023363A1/fr
Publication of WO2007023363A8 publication Critical patent/WO2007023363A8/fr

Links

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
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
    • 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
    • E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means
    • 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
    • E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid

Definitions

  • THIS INVENTION relates to an expansible rock bolt.
  • the invention is expected to be particularly advantageously applicable to supporting exposed surfaces, such as hanging- or side walls in underground mine workings. Accordingly, such application should particularly, but not exclusively, be borne in mind when considering this specification.
  • an expansible rock bolt which includes: an elongated hollow shaft having an insertion end for insertion into a drill hole, and a projection end for projection from a drill hole, the ends of the shaft being closed, and the shaft being constructed to be radially deformable under internal pressure along at least part of its length from an inoperative unexpanded condition, in which insertion thereof into a drill hole is permitted, into an operative expanded condition, in which it engages the wall of a drill hole, to anchor the rock bolt in the drill hole; a fluid inlet provided at or adjacent the projection end of the elongated hollow shaft for permitting introduction of fluid under pressure into an interior of the hollow shaft, for placing the shaft under internal pressure radially to deform the shaft into its operative expanded condition; and at least one external seal located at or adjacent the projection end of the shaft for sealingly engaging a filler head used to introduce fluid under pressure into the interior of the shaft via the fluid inlet.
  • the expansible rock bolt in accordance with the invention will advantageously be used in the context of underground mine workings. It is, however, to be appreciated that the rock bolt will also find application in the context of structural, specifically civil, engineering.
  • the expansible rock bolt may include an insertion-end closure substantially sealingly secured to and closing the insertion end of the elongated hollow shaft, and a projection-end closure substantially sealingly secured to and closing the projection end of the shaft.
  • the insertion-end closure and the projection-end closure may be elongated, the fluid inlet being provided in and located between the ends of the projection-end closure.
  • the insertion-end closure and the projection-end closure may have circular cross-sectional profiles, each seal being an annular seal received and seated in an annular recess provided in the projection-end closure.
  • the expansible rock bolt may include at least one seal on either side of the fluid inlet.
  • the insertion-end closure and the projection-end closure may be tapered toward ends of the expansible rock bolt, to facilitate, in the case of the insertion-end closure, insertion of the rock bolt into a drill hole and, in the case of the projection-end closure, to facilitate receipt of a filler head over the projection end of the hollow shaft and, accordingly, over a projection end of the rock bolt.
  • the elongated hollow shaft may be a circular cylindrical shaft which is deformed, along at least said part of its length which is expansible or deformable, into its inoperative unexpanded condition to have a generally horseshoe shaped cross-sectional profile, so that the shaft defines a channel extending longitudinally along said deformable part of its length.
  • the hollow shaft will be deformed into its inoperative unexpanded condition along its entire length, such that the channel defined thereby extends along the entire length of the hollow shaft.
  • the insertion-end closure and the projection-end closure may be in the form of caps received over and crimped respectively onto the insertion end and the projection end of the elongated hollow shaft.
  • the end closures are typically crimp-forged onto the respective ends of the hollow shaft, the crimp-forging being such that the end caps substantially sealingly close the ends of the hollow shaft, such that no welding or other form of securement is required.
  • the insertion-end closure may be provided with at least one zone of weakness permitting lateral expansion of the insertion-end closure when the elongated hollow shaft is internally pressurized by means of a working fluid.
  • the insertion-end closure when expanded, thus provides additional anchorage of the rock bolt in a drill hole.
  • Each of the insertion-end closure and the projection-end closure may be in the form of a closure assembly including a collar received over the associated end of the elongated hollow shaft and a core at least partially received in the collar and at least partially located in the channel defined by the shaft, the collar being crimped onto the shaft and said part of the core located in the channel, such that the associated end of the shaft is held captive between the collar and the core.
  • the insertion end and the projection end of the hollow shaft are thus clamped between the collar and the core of each closure assembly.
  • Each core may include a head and a shank fast with and projecting from the head, the head of the core closing an end of the collar remote from the elongated hollow shaft, and the shank being provided with at least one gripping formation for resisting separation of the associated closure assembly from the elongated hollow shaft.
  • the collar of the insertion-end closure assembly may be provided with at least one zone of weakness, permitting lateral expansion of the collar when the elongated hollow shaft is internally pressurized.
  • the projection-end closure may define a shoulder which faces the insertion end of the elongated hollow shaft for seating a washer or bearing plate received over the insertion end of the hollow shaft. In use such a washer or bearing plate is held captive between the shoulder and the hanging wall or roof of an underground mine.
  • the insertion-end closure and the projection-end closure may be of mild steel construction.
  • the elongated hollow shaft may be of mild steel construction.
  • Each seal may be a sacrificial seal selected to fail when the hollow shaft has sufficiently been deformed under internal pressure to anchor the rock bolt in a drill hole.
  • a said at least one seal will in use thus act as an indicator that the rock bolt is properly anchored in a drill hole, i.e. in the sense that upon failure of a said seal, a seal formed between the rock bolt and a filler head is broken, with consequential leakage of a working fluid being introduced into the hollow shaft.
  • the expansible rock bolt in accordance with the invention permits use of a filler head having no seals or moveable parts which require, usually relative expensive, replacement or maintenance with consequential installation down-time.
  • Figure 1 shows, schematically, a three-dimensional view of an expansible rock bolt in accordance with the invention
  • Figure 2 shows, schematically, a cross-sectional view of the rock bolt in accordance with the invention, the section being taken at Il - Il in Figure 1;
  • Figure 3 shows, schematically, a sectional side elevation of part of a hanging wall or roof of an underground mine, with the expansible rock bolt in accordance with the invention being operatively located in a drill hole drilled into the hanging wall or roof;
  • Figure 4 shows, schematically, a three-dimensional view of a filler head operatively connected to a projection end of the expansible rock bolt in accordance with the invention
  • Figure 5 shows, schematically, an exploded side elevation of another embodiment of an expansible rock bolt in accordance with the invention.
  • Figure 6 shows, schematically, a side elevation of the expansible rock bolt shown in Figure 5 in its assembled form
  • Figure 7 shows, schematically, a cross-sectional view of the expansible rock bolt shown in Figure 6, the section being taken at VII - VII in Figure 6;
  • Figure 8 shows, schematically, a sectional side elevation of part of a hanging wall or roof in an underground mine, with the expansible rock bolt shown in Figures 6 being operatively located in a drill hole drilled in the hanging wall or roof;
  • Figure 9 shows, schematically, a three-dimensional view of the filler head shown in Figure 4.
  • an expansible rock bolt in accordance with the invention is generally designated by reference numeral 10.
  • the rock bolt 10 includes an elongated hollow shaft 12 having an insertion end 14 for insertion into a drill hole, and a projection end 16 for projection from a said drill hole.
  • the insertion end 14 of the shaft 12 is closed by an insertion-end closure in the form of an end cap 18, and the projection end 16 of the shaft 12 is closed by a projection-end closure in the form of an end cap 20.
  • the elongated hollow shaft 12 and the end caps 18, 20 are of mild steel construction, the end caps 18, 20 being crimp-forged onto the respective ends 14, 16 of the hollow shaft 12, so as properly to seal the ends of the shaft 12.
  • the end caps 18, 20 are thus secured to the ends 14, 16 of the shaft 12 without welding or any other form of additional securement or treatment.
  • the insertion end 14 of the hollow shaft 12 is located adjacent an insertion end of the rock bolt 10, and the projection end 16 of the hollow shaft 12 is located adjacent a projection end of the rock bolt 10.
  • the insertion end of the rock bolt 10 is hereunder referred to as the insertion end 14, the projection end of the rock bolt 10 hereunder being referred to as the projection end 16.
  • the rock bolt 10 will typically be much longer as shown in Figure 1.
  • the rock bolt 10 further has an inlet opening 22 in communication with an interior 24 (see in particular Figure 2) of the hollow shaft 12.
  • the elongated hollow shaft 12 is in the form of a circular cylindrical hollow shaft which is deformed along its entire length into an inoperative unexpanded condition such that it has a generally horseshoe-shaped cross-sectional profile, the shaft 12, in its inoperative unexpanded condition thus defining a channel 26.
  • the hollow shaft 12 is radially or laterally, i.e. away from a longitudinal axes thereof, expansible or deformable into an operative expanded condition (not shown) by means of internal fluid pressure, the fluid under pressure being produced into the interior 24 of the hollow shaft 12 via the inlet opening 22.
  • the hollow shaft 12 In its operative expanded condition, the hollow shaft 12 is plastically deformed from it inoperative unexpanded condition such that a mean radius thereof exceeds the mean radius of the hollow shaft 12 when in its inoperative unexpanded condition.
  • a wall of the hollow shaft 12 engages a wall defining a drill hole in a hanging- or side wall of an underground mine when the hollow shaft 12 is in its operative expanded condition, so as to anchor the rock bolt 10 in the drill hole.
  • the insertion-end cap 18 includes an elongated cylindrical section 28 which is received over the insertion end 14 of the hollow shaft 12, and a tapering section 29 integrally formed with the cylindrical section 28, tapering away from the hollow shaft 12, i.e. toward the insertion end 14 of the rock bolt 10.
  • the tapering section 29 facilitates insertion of the insertion end 14 of the rock bolt 10 into a drill hole.
  • the projection-end cap 20 includes an elongated cylindrical section 30 received over the projection end 16 of the hollow shaft 12, and a tapering section 32, tapering away from the hollow shaft 12, i.e. toward the projection end 16 of the rock bolt 10.
  • the tapering section 32 facilitates receipt of a filler head, described in more detail hereunder (see in particular Figures 4 and 9), over the projection end 16 of the rock bolt 10.
  • the cylindrical section 30 of the projection-end cap 20 is provided with two longitudinally spaced recesses (not visible), the recesses being located on either side of the inlet opening 22.
  • An annular seal in the form of an elastomeric O-ring 34 is received in each of the aforementioned recesses, which O-rings 34 provide sealing, as hereunder described in more detail, between the cylindrical section 28 of the projection-end cap 20 and the filler head when the interior 24 of the hollow shaft 12 is to be placed under fluid pressure, to deform or expand the hollow shaft 12 into its operative expanded condition.
  • the rock bolt 10 is inserted into a drill hole 36 drilled into a hanging wall or roof 38 of an underground mine.
  • the rock bolt 10 can also be used in the context of side walls of mines.
  • the rock bolt 10 serves the same purpose as known rock bolts used in the context of underground mine workings.
  • the rock bolt 10 is located in the drill hole 36 such that its projection-end cap 20 projects from the hanging wall or roof 38.
  • a washer or bearing plate is located between the hanging wall or roof 38 and the projection-end cap 20, the washer or bearing plate in use bearing against the hanging wall or roof 38.
  • the aforementioned filler head is generally designated by reference numeral 40, and includes an elongated body 42 having a leading end 44 and a trailing end 46.
  • the body 42 is provided with a circular central bore or passage 48 having a countersunk entrance 50 provided at the leading end 44 of the body 42.
  • the filler head 40 is received over the projection-end cap 20 of the rock bolt 10, the projection-end cap 20 being received in the bore or passage 48 of the filler head 40.
  • the tapering section 32 of the projection-end cap 20 and the countersunk entrance 50 of the bore or passage 48 facilitate receipt of the filler head 40 over the projection end cap 20.
  • the filler head 40 is provided with a circular recess 52 projecting radially outwardly from the central bore or passage 48.
  • the filler head 40 is further provided with a fluid port 54 which opens into the circular recess 52.
  • the filler head 40 includes a connector which, in this example, is in the form of a nut-and-bolt assembly 56 for connection of the filler head 40 to a support structure (not shown).
  • the filler head 40 unlike filler heads known to the Applicant, does thus not include any moving parts or seals which need replacement and/or maintenance, which replacement or maintenance leads to installation down-time.
  • the nut-and-bolt assembly 56 also acts as location formation for operatively locating the projection-end cap 20 of the rock bolt 10 in the bore or passage 48 such that the inlet opening 22 of the rock bolt 20 is aligned with the circular recess 52.
  • the nut-and- bolt assembly 56 thus acts as a stopper against which the projection-end cap 20 buts when the filler head 40 is received over the projection end 16 of the rock bolt 10.
  • the O-rings 34 provide sealing between the cylindrical section 30 of the projection-end cap 20 and a wall of the body 42 of the filler head 40 defining the bore or passage 48, such that sealed communication is provided between the interior 24 of the hollow shaft 12 and the fluid port 54 of the filler head 40.
  • a hydraulic working fluid typically water, under pressure is introduced into the interior 24 of the hollow shaft 12 via the fluid port 54, to expand the hollow shaft 12 from its inoperative unexpanded condition into its operative expanded condition, in which operative expanded condition, a wall of the hollow shaft 12 engages a wall of the hanging wall or roof 38 defining the drill hole 36, thereby to anchor the rock bolt 10 in the drill hole 36.
  • a pneumatic fluid such as air under pressure can also be used as a working fluid for expanding or deforming the hollow shaft 12.
  • the water introduced into the interior 24 of the hollow shaft 12 is placed under pressure of between about 27MPa and 30MPa.
  • the O-rings 34 are selected to fail once the pressure in the interior 24 of the hollow shaft 12 has sufficiently expanded the hollow shaft 12, so that upon failure of one of the O-rings 34 water leaks from the body 40 of the filler head 32 and the rock bolt 10, thereby giving an indication to an operator of the filler head 32 that the rock bolt 10 is sufficiently expanded, to anchor it in the drill hole 36.
  • FIG. 60 another embodiment of an expansible rock bolt in accordance with the invention is generally designated by reference numeral 60.
  • the expansible rock bolt 60 in certain respects, resembles the expansible rock bolt 10 and, accordingly, unless otherwise indicated, reference numerals used to indicate parts or features of the expansible rock bolt 10 are also used to indicate like parts or features of the expansible rock bolt 60.
  • the rock bolt 60 includes an elongated hollow shaft similar to the elongated hollow shaft 12 of the rock bolt 10. In this embodiment, however, the insertion end 14 of the hollow shaft 12 is closed by an insertion-end closure assembly 62, and the projection end 16 of the hollow shaft 12 is closed by a projection-end closure assembly 64.
  • the insertion-end closure assembly 62 includes an elongated collar 66, having a circular cross-sectional profile, received over the insertion end 14 of the hollow shaft 12, and a core 68 partially received in the elongated collar 66.
  • the core 68 includes a head 70 and an elongated shank 72 fast with and projecting form the head 70, the shank 72 being received in the channel 26 of the hollow shaft 12.
  • the collar 66 is crimp-forged onto the insertion end 14 of the hollow shaft 12 and, accordingly, onto the shank 72 of the core 68.
  • an insertion end portion of the hollow shaft 12 is held captive or clamped between the collar 66 and the shank 72 of the core 68.
  • the shank 72 is provided with a plurality of gripping formations in the form of spaced ribs 74.
  • the collar 66 is provided with a plurality of longitudinally extending circumferentially spaced grooves 76, each of the grooves 76 providing a zone of weakness which permits radial or lateral expansion of the collar 66 when the interior 24 of the shaft 12 is placed under internal fluid pressure.
  • the collar 66 is, in similar fashion to and simultaneously with the hollow shaft 12, deformed into an expanded condition, in which it, as is the case with the hollow shaft 12, engages the hanging wall or roof 38, to provide additional anchorage or load-bearing capacity to the rock bolt 60.
  • the collar 60 by virtue of its being anchorable in a drill hole, thus provides the rock bolt 10 with enhanced axial or longitudinal tensile strength.
  • a tie (not shown), such as a steel rope or rod, can be provided inside the hollow shaft 12, ends of the tie being secured to ends of the rock bolt 10, further to increase the longitudinal tensile strength of the rock bolt 10.
  • the projection closure assembly 64 it too includes an elongated collar 78 and a core 80, which core 80 includes a head 82 and a shank 84 provided with a plurality of gripping formations in the form of spaced ribs 86.
  • the inlet opening 22 of the rock bolt 60 is provided in the collar 78.
  • the collar 78 is, on each side of the inlet opening 22, provided with two spaced annular recesses 88, with an O-ring 34 being received or located in each of the recesses 88.
  • the rock bolt 60 is operatively inserted into or located in a drill hole 36 in similar fashion as that hereinbefore described with reference to the rock bolt 10.
  • an end of the collar 78 received over the hollow shaft 12 is provided with an operatively upwardly facing shoulder 92.
  • rock bolt in accordance with the invention is herein described with particular reference to underground mine workings, it is to be appreciated that it could equally advantageously be used in the context of structural, in particular civil, engineering.
  • the invention as described and illustrated thus provides a rock bolt which includes seals for providing sealing between the projection end of the rock bolt and a filler head, such that a filler head used in the context of the rock bolt in accordance with the invention need not include moveable parts or any seals.
  • the seals because of their particular construction, i.e. their being designed to fail once the rock bolt is sufficiently expanded or deformed, are relatively cheap in comparison to seals and moving parts conventionally forming part of filler heads. Maintenance required on conventional filler heads having moveable components and/or seals result in downtime in installation of rock bolts.
  • the invention as described and illustrated provides for use of a filler head which, by virtue of its having no seals which need replacement or moveable parts which need maintenance, will lead to a reduction in said installation down-time.
  • the rock bolt in accordance with the invention facilitates repetitive correct installation of rock bolts in drill holes.

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  • 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)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne un boulon extensible (60). Le boulon décrit dans cette invention comprend une tige creuse allongée (12) présentant une extrémité d'insertion (14) conçue pour être insérée dans un trou de forage, et une extrémité en saillie (16) conçue pour être en saillie depuis le trou de forage. Les extrémités de la tige sont fermées. La tige est conçue de manière à pouvoir être déformée radialement sous l'effet d'une pression interne le long d'au moins une partie de sa longueur depuis un état non étiré inopérationnel jusqu'à un état étiré opérationnel. Le boulon comprend également un orifice d'amenée de fluide (22), lequel orifice est conçu pour permettre l'introduction d'un fluide sous pression dans un intérieur (24) de la tige, de manière à soumettre la tige à une pression interne radiale afin de la déformer jusqu'à son état étiré opérationnel. Au moins un joint externe (34) est placé ou sur ou à côté de l'extrémité en saillie de la tige afin de s'engrener de manière étanche dans une tête de remplissage utilisée pour introduire un fluide sous pression dans la tige à travers l'orifice d'amenée.
PCT/IB2006/002291 2005-08-23 2006-08-23 Boulon extensible WO2007023363A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ZA2005/06753 2005-08-23
ZA200506753 2005-08-23
ZA200509583 2005-11-28
ZA2005/09583 2005-11-28

Publications (2)

Publication Number Publication Date
WO2007023363A1 true WO2007023363A1 (fr) 2007-03-01
WO2007023363A8 WO2007023363A8 (fr) 2007-05-03

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PCT/IB2006/002291 WO2007023363A1 (fr) 2005-08-23 2006-08-23 Boulon extensible

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011035353A2 (fr) 2009-09-24 2011-03-31 Atlas Copco Mai Gmbh Boulon d'ancrage par friction tubulaire
CN102337914A (zh) * 2011-10-28 2012-02-01 湖南科技大学 一种焊接式动静组合锚杆
AU2009201251B2 (en) * 2008-04-01 2014-10-30 DSI Underground Australia Pty Limited Washer assembly for an inflatable friction bolt
US9175561B2 (en) 2011-06-14 2015-11-03 Shane Brown Resin injection apparatus for drilling apparatus for installing a ground anchor
EP3320179A4 (fr) * 2015-07-10 2019-03-13 Epiroc Canada Inc. Renfort de cisaillement et de traction pour boulon gonflable

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016742A1 (fr) * 1979-03-09 1980-10-01 Atlas Copco Aktiebolag Procédé d'ancrage dans la roche et boulon en forme de tube expansible
GB2072784A (en) * 1980-03-28 1981-10-07 Thom R W Anchor bolt
EP0077762A2 (fr) * 1981-10-19 1983-04-27 Atlas Copco Aktiebolag Procédé pour la mise en place d'un boulon d'ancrage et boulon d'ancrage
US4954017A (en) * 1980-11-10 1990-09-04 The Curators Of The University Of Missouri Expansion bolt and mine roof reinforcement
WO2000075489A1 (fr) * 1999-06-04 2000-12-14 Atlas Copco Rock Drills Ab Boulon d'ancrage tubulaire
WO2004016909A1 (fr) * 2002-08-19 2004-02-26 John Paul Mckelvey Boulon d'ancrage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016742A1 (fr) * 1979-03-09 1980-10-01 Atlas Copco Aktiebolag Procédé d'ancrage dans la roche et boulon en forme de tube expansible
GB2072784A (en) * 1980-03-28 1981-10-07 Thom R W Anchor bolt
US4954017A (en) * 1980-11-10 1990-09-04 The Curators Of The University Of Missouri Expansion bolt and mine roof reinforcement
EP0077762A2 (fr) * 1981-10-19 1983-04-27 Atlas Copco Aktiebolag Procédé pour la mise en place d'un boulon d'ancrage et boulon d'ancrage
WO2000075489A1 (fr) * 1999-06-04 2000-12-14 Atlas Copco Rock Drills Ab Boulon d'ancrage tubulaire
WO2004016909A1 (fr) * 2002-08-19 2004-02-26 John Paul Mckelvey Boulon d'ancrage

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009201251B2 (en) * 2008-04-01 2014-10-30 DSI Underground Australia Pty Limited Washer assembly for an inflatable friction bolt
WO2011035353A2 (fr) 2009-09-24 2011-03-31 Atlas Copco Mai Gmbh Boulon d'ancrage par friction tubulaire
WO2011035353A3 (fr) * 2009-09-24 2012-05-03 Atlas Copco Mai Gmbh Boulon d'ancrage par friction tubulaire
US8651769B2 (en) 2009-09-24 2014-02-18 Atlas Copco Mai Gmbh Friction bolt
RU2533389C2 (ru) * 2009-09-24 2014-11-20 Атлас Копко Май Гмбх Фрикционный болт
US9175561B2 (en) 2011-06-14 2015-11-03 Shane Brown Resin injection apparatus for drilling apparatus for installing a ground anchor
CN102337914A (zh) * 2011-10-28 2012-02-01 湖南科技大学 一种焊接式动静组合锚杆
EP3320179A4 (fr) * 2015-07-10 2019-03-13 Epiroc Canada Inc. Renfort de cisaillement et de traction pour boulon gonflable

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