EP1629178A1 - Boulon d'ancrage - Google Patents

Boulon d'ancrage

Info

Publication number
EP1629178A1
EP1629178A1 EP04735851A EP04735851A EP1629178A1 EP 1629178 A1 EP1629178 A1 EP 1629178A1 EP 04735851 A EP04735851 A EP 04735851A EP 04735851 A EP04735851 A EP 04735851A EP 1629178 A1 EP1629178 A1 EP 1629178A1
Authority
EP
European Patent Office
Prior art keywords
elongate member
rock bolt
rock
elongate
drilling
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.)
Withdrawn
Application number
EP04735851A
Other languages
German (de)
English (en)
Other versions
EP1629178A4 (fr
Inventor
Ross Seedsman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dunefire Pty Ltd
Original Assignee
Dunefire Pty Ltd
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
Priority claimed from AU2003902774A external-priority patent/AU2003902774A0/en
Priority claimed from AU2004900773A external-priority patent/AU2004900773A0/en
Application filed by Dunefire Pty Ltd filed Critical Dunefire Pty Ltd
Publication of EP1629178A1 publication Critical patent/EP1629178A1/fr
Publication of EP1629178A4 publication Critical patent/EP1629178A4/fr
Withdrawn legal-status Critical Current

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
    • E21D21/0053—Anchoring-bolts in the form of lost drilling rods
    • 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
    • E21D21/008—Anchoring or tensioning means

Definitions

  • the present invention relates to a rock bolt suitable for use in the mining and tunnelling industry.
  • Roof and wall support is a crucial aspect of mining and tunnelling operations.
  • Mine and tunnel walls and roofs consist of rock strata, which must be reinforced to prevent the possibility of collapse.
  • Rock bolts are widely used for consolidating the rock strata.
  • a rod is anchored and often tensioned in a hole drilled transversely through the rock strata for this purpose.
  • the bolt is secured using a resin or cement based grouting fluid, which is inserted around the rod and activated.
  • the first end of the first elongate member may be comprised of a hardened material suitable for drilling into a rock wall such as tungsten or titanium carbide.
  • the present invention provides a rock bolt comprising first and second elongate members, the first elongate member comprising a first end adapted to receive means to penetrate rock, and a second end adapted to provide attachment for actuating means, wherein the first elongate member is disposed at least partially, longitudinally inside the second elongate member.
  • the second elongate member is adapted for transverse expansion along at least a portion of its length.
  • the first elongate member comprises a portion of greater transverse dimension than the at least portion of the second elongate member adapted for transverse expansion.
  • the second elongate member comprises at least a portion adapted for transverse expansion
  • the means for penetrating rock comprises a portion of greater transverse dimension than the at least portion of the second elongate member adapted for transverse expansion
  • the first elongate member can be, for example, a hollow rod having a circular cross-section, a solid rod having a circular cross-section, a hollow rod having a non-circular cross-section or a solid rod having a non-circular cross-section. Further, the first elongate member can feature a smooth axially outer surface or alternatively a rough or irregular surface, the rough or irregular surface providing additional bonding between grout and the first elongate member.
  • the second elongate member can be, for example, a hollow rod having a circular cross-section or a hollow rod having a non-circular cross- section.
  • the second elongate member may be comprised of a material such as a metal or a composite of multiple elongate metal members and a lower cost plastic tube, having enough longitudinal axial rigidity to allow engagement of the expansion shells.
  • the second elongate member may comprise a plastic tube with a discontinuous steel end collar.
  • At least one expansion shell is transversely expanded as the attachment means is advanced towards the first end of the first elongate member.
  • the unexpanded transverse dimension of the expansion shells comprises a portion of lesser transverse dimension than the first elongate member, which is advanced longitudinally into contact with the first elongate member.
  • the transverse force caused by this contact causes expansion of the one or more expansion shells in an embodiment.
  • a cavity may be provided, extending between the first and second elongate members, to allow fluid flow between the first and second ends of the first elongate member.
  • the cavity may extend longitudinally between the first and second elongate members.
  • the cavity may be annular.
  • the second elongate member may include a material such as a metal or a composite of multiple elongate metal members and a lower cost plastic tube.
  • the second elongate member may include a plastic tube.
  • the plastic tube is made from a long life plastic such as polyethylene. The plastic is non-corroding and, should a crack form in the grout, the plastic tube acts as a barrier stopping the crack so that it does not allow water to reach the bolt and corrode it, which would reduce the life of the rock bolt.
  • the second end of the first elongate member is further adapted to provide attachment to a first end of a third elongate member, and the second elongate member includes a second end adapted to provide attachment to the first end of a fourth elongate member.
  • the first elongate member is arranged to be lockable to the third elongate member to substantially prevent relative rotation between the two in at least one rotational direction when locked together.
  • the rock bolt may additionally comprise a third elongate member and a fourth elongate member.
  • the actuating means may comprise rotational driving means removably connected to the attachment means for advancing the drill bit means rotatably through rock in a first rotational direction and for also bringing the first elongate member portion, or the rock penetrating means portion, of greater transverse dimension than the portion of the second elongate member adapted for transverse expansion, into engagement with the portion of the second elongate member adapted for transverse expansion, in the first rotational direction.
  • the actuating means comprises rotational driving means removably connected to the attachment means for advancing the drill bit means rotatably through rock in a first rotational direction and for bringing the first elongate member portion, or the rock penetrating means portion, of greater transverse dimension than the portion of the second elongate member adapted for transverse expansion, into engagement with the portion of the second elongate member adapted for transverse expansion, in a second rotational direction.
  • the grout is injected into the cavity between the first and second elongate members after drilling and transverse expansion of the second elongate member.
  • the present invention provides rock bolt extension means comprising third and fourth elongate members, the third elongate member comprising a first end adapted to provide attachment to a second end of a first elongate member of a rock bolt according to any one of the previous aspects, and a second end adapted to provide attachment for actuating means and further adapted to provide attachment to a first end of a fifth elongate member, and the fourth elongate member comprising a first end adapted to provide attachment to a second end of a second elongate member of a rock bolt according to any one of the previous aspects, and a second end adapted to provide attachment to a first end of a sixth elongate member, wherein the third elongate member is disposed at least partially, longitudinally inside the fourth elongate member.
  • a cavity may be provided, extending longitudinally between the third and fourth elongate members, to allow fluid flow between the first and second ends of the third elongate member.
  • the present invention provides a rock bolt kit comprising first and second elongate members and rock penetrating means adapted to be received by the first end of the first elongate member, the first elongate member comprising a first end adapted to receive the rock penetrating means, and a second end adapted to provide attachment for actuating means, wherein the first elongate member is adapted to be disposed at least partially, longitudinally inside the second elongate member.
  • the second elongate member is adapted for transverse expansion along at least a portion of its length.
  • the first elongate member comprises a portion of greater transverse dimension than the portion of the second elongate member adapted for transverse expansion.
  • the rock penetrating means comprises a portion of greater transverse dimension than the portion of the second elongate member adapted for transverse expansion.
  • an attachment means is provided at the second end of the first elongate member to provide attachment for actuating means and wherein on advancement of the attachment means towards the first end of the first elongate member, the attachment means is arranged to produce either directly or indirectly a transverse force in the portion of the second elongate member adapted for transverse expansion thereby causing transverse expansion thereof.
  • the attachment means comprises an internally threaded collar mounted on a threaded portion of the first elongate member.
  • the second elongate member may be corrugated to provide stress transfer between the inner and outer surface of the second elongate member.
  • the first elongate member may be comprised of an elevated tensile strength material such as steel, suitable for acting as a structural member.
  • the first elongate member and/or second elongate member may be comprised of an elevated tensile strength material such as fibreglass, suitable for acting both as a structural member and which can be cut through once the bolt has been positioned in the rock face by drilling. This allows the rock face that has been bolted to be subsequently excavated.
  • the second elongate member comprises at least one expansion shell.
  • Other preferable features of the rock bolt kit may be provided as for the rock bolt of the previous aspects of the invention.
  • the present invention provides rock penetrating means comprising a cutting element and means for attaching the rock penetrating means to a rock bolt according to the second aspect of the invention.
  • the rock penetrating means may also comprise means for expanding the second elongate member of a rock bolt according to any one of the preceding aspects of the invention wherein the first end of the first member is adapted to receive means to penetrate rock.
  • the rock penetrating means comprises a portion of greater transverse dimension than a portion of the second elongate member adapted to restrict longitudinal movement of the second elongate member.
  • a plate may be provided attached to the first elongate member, the plate being arranged to substantially prevent relative rotation of the attachment means and first elongate member in a first direction of rotation.
  • the present invention provides a method of drilling, the method comprising (a) drilling a drilling member, the drilling member comprising first and second elongate members, the first elongate member being disposed at least partially, longitudinally inside the second elongate member, the first elongate member comprising a first end adapted to penetrate rock and a second end adapted to provide attachment for actuating means, into a rock face, while flushing a first fluid between the first elongate member, second elongate member and rock face in the region of the first end of the first elongate member; and (b) removing the drilling member from the rock once a hole of the desired depth has been drilled.
  • the fluid may be a cooling and/or flushing fluid, which may be a liquid (e.g. water) or a gas (e.g. air).
  • a cooling and/or flushing fluid which may be a liquid (e.g. water) or a gas (e.g. air).
  • the fluid may be injected through one or more access channels.
  • the first elongate member could comprise a first end adapted to receive means to penetrate rock, such as a drill bit. This would allow replacement of the drill bit due to wear or to suit specific conditions.
  • the present invention provides a method of installing a rock bolt, the method comprising (a) drilling the rock bolt, the rock bolt comprising first and second elongate members, the first elongate member being disposed at least partially, longitudinally inside the second elongate member, the first elongate member comprising a first end adapted to penetrate rock and a second end adapted to provide attachment for actuating means, into a ' rock face, while flushing a first fluid through a cavity between the first elongate member and second elongate member and past the rock face in the region of the first end of the first elongate member, (b) injecting a grouting fluid between the first elongate member, second elongate member and rock face, and (c) waiting a preset time period for the grouting fluid to set.
  • the first fluid may be a cooling and flushing fluid, and the fluids may be injected through one or more access channels.
  • the method could further include passing the fluids through a cavity extending between the third and fourth elongate members to the cavity between the first and second elongate members and past the rock face in the region of the first end of the first elongate member.
  • the second elongate member of the rock bolt used in the method may additionally include a portion adapted for transverse expansion.
  • the second elongate member may be moved longitudinally relative to the first end of the first elongate member, to cause the portion adapted for transverse expansion to expand transversely and retain the bolt in the rock face.
  • the longitudinal movement may be caused by relative rotation of the first and second elongate members, causing threads on the first and second elongate members to push the second elongate member toward the first end of the first elongate member.
  • the longitudinal movement may be caused by relative rotation of the first and second elongate members, pushing the second elongate member toward the first end of the first elongate member, causing expansion of the portion adapted for transverse expansion.
  • the rock bolt used in the method may be rotationally advanced in a first rotational direction and the portion of greater transverse dimension than the portion of the second elongate member adapted for transverse expansion is then brought into engagement with the portion of the second elongate member adapted for transverse expansion by rotation in the first rotational direction.
  • the rock bolt may then be tensioned by further relative rotation of the elongate members.
  • the fluids are injected through the one or more access channels in the second end of the first elongate member into a cavity between the first and second elongate members and the fluids exit the cavity through one or more further access channels in the region of the first end of the first elongate member before passing into a second cavity between the second elongate member and the rock face.
  • the second elongate member of the rock bolt used in the method may be comprised of a low strength material and, in this embodiment, before (b), the second elongate member is brought into engagement with the portion of the first elongate member adapted to penetrate rock by rotation in a first rotational direction, to cause the second elongate member to distort by the lateral force acting on the second elongate member and make at least one portion of the second elongate member come into contact with the rock face.
  • a method of installing a rock bolt comprising: (a) drilling the rock bolt, the rock bolt comprising first and second elongate members, the first elongate member comprising a first end adapted to penetrate rock and a second end adapted to provide attachment for actuating means and the second elongate member including a portion adapted for transverse expansion, into a rock face, (b) providing an extension rod comprising third and fourth elongate members, the third elongate member comprising a first end adapted to lock with the second end of the first elongate member so as to substantially prevent relative rotation between the first elongate member and the third elongate member in at least the rotational direction of drilling, and the fourth elongate member comprising a first end adapted attach to the second end of the second elongate member, (c) extending the length of the first elongate member by rotatably locking a third elongate member into the second end of the first elongate
  • the present invention provides a self drilling rock bolt having opposite first and second ends and a shaft extending between the ends, the first end being adapted to penetrate rock and the second end being adapted to be connected to a drilling apparatus to allow rotation of and thrust to the bolt, a sleeve extending along and around the shaft, and a passage formed between the sleeve and the shaft to allow fluid to be passed along the bolt shaft.
  • drilling fluid may be passed along the bolt shaft and across the first end to assist in flushing of material from the rock face during drilling.
  • This fluid may be water, or similar liquid, in a wet drilling process, or may be air in a vacuum drilling process.
  • the fluid may forced along the passage to the first end, or alternatively may be drawn from the first end towards the second end.
  • the first end incorporates at least one drill tip that extends radially from the bolt axis a distance greater than the sleeve.
  • an outer passage promotes a circulation path in the drilled hole where fluid can be directed towards the first end through one passage and passes from the first end to exit the hole along the other passage. Also, the passages are used introduce grout into the drilled hole and are also able to be filled to promote adequate bonding of the bolt to the rock.
  • the sleeve may be deformable under axial compression or the sleeve may incorporate at least one weakened area that facilitates deformation of the sleeve.
  • the at least one weakened area may be in the form of a slit formed in the sleeve.
  • the self drilling rock bolt may further comprise an anchoring device which is operative to retain the rock bolt when located in a drilled hole.
  • the anchoring device is located proximate the first end and is operative in response to axial movement of the shaft relative to the sleeve.
  • the anchoring device is in the form of at least one expansion shell that is displaceable radially outwardly.
  • the rock bolt incorporates an engaging surface and the at least one expansion shell becomes operative on movement of the engaging surface across an inner surface of the at least one expansion shell.
  • the self drilling rock bolt further comprises a collar piece that extends about the shaft adjacent its second end and is displaceable axially along the bolt shaft.
  • the sleeve may be displaceable along the shaft in response to movement of the collar piece along the shaft.
  • the collar piece may be connected to the shaft by an external thread on the shaft that engages with and a complementary inner thread of the collar piece.
  • the rock bolt is adapted to be connected to the drilling apparatus by connection of the drilling apparatus with the collar piece.
  • openings are provided to the passage.
  • these openings are provide at, or adjacent to, the respective ends of the sleeve.
  • a channel may be provided that allows fluid to be introduced into the passage through the collar piece.
  • Another channel may be formed adjacent the first end to facilitate the flow of fluid between the passage and the drill tip. At least part of the channel that extends to the drill tip may be located within the rock bolt.
  • the shaft of the self drilling rock bolt is load bearing on installation of the rock bolt and may be formed from a steel rod.
  • the sleeve of the self drilling rock bolt may be formed from plastic.
  • the self drilling rock bolt further comprises an abutment member located proximate the second end, the abutment member being displaceable along the shaft and having an abutment surface that faces towards the first end and projects radially from the bolt axis a distance greater than the drill tip.
  • the drill shaft and sleeve of the self drilling rock bolt are each formed from a plurality of sections that are connected together.
  • the present invention provides a drill bit comprising a bit body having opposite ends and a wall surface extending between the ends, at least one drill tip located at one end and the bit being adapted to be connected to a drill rod at the other end, wherein a least one channel extends from the wall surface to the at least one drill tip.
  • the drill bit may further include a wall portion from the wall surface that tapers outwardly towards the one end.
  • a method of stabilising rock comprising drilling a hole into the rock using a self drilling rock bolt having a drilling end and an opposite end connected to a drilling apparatus, providing drilling fluid to the drilling end during drilling of the hole by conveying fluid along the outer surface of the bolt shaft, and fixing the rock bolt within the hole to stabilise the rock.
  • the drilling fluid may be guided along the shaft in a passage defined by a sleeve disposed around and along the shaft.
  • Grout may be introduced into the hole to fix the rock bolt to the rock.
  • the rock bolt may be initially anchored within the hole prior to introducing grout into the hole.
  • Figures 1a and b show a rock bolt of an embodiment of the invention.
  • Figure 2 shows a rock bolt with expansion shells engaged.
  • Figures 3a, b and c show an alternative rock bolt of an embodiment of the invention.
  • Figures 4a, b, c and d show a further alternative rock bolt of an embodiment of the invention.
  • Figures 5a, b and c show another alternative rock bolt of an embodiment of the invention.
  • Figures 6a, b, c and d show an alternative rock bolt of an embodiment of the invention.
  • Figures 7a, b and c show an alternative rock bolt of an embodiment of the invention.
  • FIGS 8a, b and c show an alternative rock bolt of an embodiment of the invention.
  • Figures 9a and b show a drill of an embodiment of the invention.
  • Figures 10a, b and c show a further alternative rock bolt of an embodiment of the invention.
  • Figures 11a, b and c show another alternative rock bolt of an embodiment of the invention.
  • FIG. 1a shows a rock bolt 10 of an embodiment of the invention comprising: a first elongate member, or shaft, 11 and a second elongate member, or sleeve, 12, wherein the first elongate member 11 is disposed at least partially, longitudinally inside the second elongate member 12, the first elongate member 11 comprising a first end 13, at a first end of the bolt 10, in the form of means, in the present embodiment a drill tip, adapted to penetrate rock and a second end 14, at a second end of the bolt which is threaded with an external thread and provided with a collar piece 15 which has an internal, or complementary inner, thread adapted to provide attachment for actuating means by a hexagonal engaging region shown in Figure 1 b.
  • the second elongate member 12 is adapted for transverse expansion along at least a portion of its length through provision of an anchoring device in the form of expansion shells 16.
  • the rock bolt 10 of Figure 1 is drilled into the rock wall by attaching a drilling apparatus (not shown) to the internally threaded collar piece 15 and rotating threaded collar piece 15, first elongate member 11 and drill bit means 13.
  • a cavity, or passage, 17 between elongate members 11 and 12 can be provided, and used to transmit water or air while drilling to flush out drilling residue and reduce the temperature of the drill bit means 13.
  • Following drilling and insertion of the rock bolt 10 into the rock internally threaded collar piece 15 is reverse rotated causing the internally threaded collar piece 15 to advance towards the first end 13 of the first elongate member 11 along the complementary external thread provided thereon.
  • Advancement of second elongate member 12 brings the anchoring device, in the present embodiment expansion shells 16, into engagement with a portion of first elongate member 11 of greater transverse dimension than the unexpanded transverse dimension of the expansion shells 16.
  • the transverse force caused by this engagement causes deformation in the form of transverse expansion of the expansion shells 16 thereby wedging the rock bolt 10 in the hole drilled by drill bit means 13.
  • the anchoring device in the form of expansion shells 16 incorporates at least one weakened area in the form of a slit in the second elongate member 12.
  • the second end 14 of first elongate member 11 may be adapted (by providing a pin such as a cotter or spring pin attached through the end of first elongate member 11 for example) so that threaded collar piece 15 cannot be removed.
  • Grout can also be injected into the cavity, or passage, 17 between the elongate members for additional reinforcement.
  • Figures 3a, b and c show a rock bolt 20 of an embodiment of the invention comprising a first elongate member, or shaft, 21 and a second elongate member, or sleeve, 22.
  • the first end of the first elongate member 21 comprises, as rock penetrating means, or drill bit, an integral drill tip 23 in the form of a wedge cutting head, which extends radially from the bolt axis by a distance greater than that of the second elongate member.
  • the second end of first elongate member 21 comprises an externally threaded portion 24 upon which is internally, or complementary inner, threaded nut, or collar piece, 25.
  • Second elongate member 22 is comprised of an elongate hollow tube 26 having a low strength wall and higher strength expansion shells, or anchoring device, 27 located at one end.
  • the first ends of the first and second elongate members 21 , 22 correspond to a first end of the bolt 20.
  • Figure 3a shows the first elongate member 21 separated from the second elongate member 22.
  • Figure 3b shows the rock bolt 20 drilling into a wall in a first rotational direction by means of drill tip 23 and a drill actuating means, or drilling apparatus, (not shown) acting on nut 25.
  • the end of elongate member 21 is adapted (by providing a plate attached to the end of first elongate member 21 for example) so that nut 25 cannot be removed.
  • First elongate member 21 is disposed partially within second elongate member 22 with drill tip 23 protruding above expansion shells 27.
  • Drill tip 23 is dimensioned to drill a hole large enough to receive both the first elongate member 21 and second elongate member 22.
  • nut 25 is tightened by turning the nut 25 in a second rotational direction.
  • a washer, or abutment member, 28 extends beyond the hole drilled in the wall so that tightening nut 25 pushes washer 28 into abutment with second elongate member 22 and then urges expansion shells 27 of second elongate member 22 into abutment with drill tip 23.
  • Washer 28 has an abutment surface that faces toward the first end of the bolt and projects radially from the bolt axis a distance greater than the drill tip 23.
  • Drill tip 23 has a splayed portion of larger external (radial) dimension than the internal dimension of expansion shells 27 so that as tightening nut 25 urges expansion shells 27 against drill tip 23, expansion shells 27 expand to accommodate drill tip 23, this expansion forcing expansion shells 27 into contact with the sides of the hole.
  • FIG 3c shows rock bolt 20 at the end of this procedure with elongate hollow tube 26 having a low strength wall distorted, or deformed, by the axial force acting on the tube, and higher strength expansion shells 27 expanded into contact with the drilled hole wall.
  • Figure 4a shows another rock bolt 30 of an embodiment of the invention.
  • Rock bolt 30 comprises a first elongate member, or shaft, 31 and a second elongate member, or sleeve, 32.
  • First elongate member, or shaft, 31 is disposed partially, longitudinally inside second elongate member 32.
  • First elongate member 31 comprises a first end, which comprises an external thread 33, and a second end 34 comprising a drive element, or attachment means, 35 shown in plan view in Figure 4b in the section taken along line C- C of Figure 4a. As shown in Figure 4b, drive element 35 is surrounded by access holes, or channels, 36.
  • Second elongate member 32 comprises an anchoring device in the form of expansion shells 38 located at its second end 39.
  • Rock penetrating means, or drill bit, in the form of drill tip 40 is internally threaded with a thread 41 that matches external thread 33 and comprises access holes 42 adjacent thread 41 and a central flushing hole 43 as shown in the cross sections of Figures 4c and 4d taken along lines A-A and B-B respectively.
  • External thread 33 includes a transversely oriented plate member 45 at the first end of first elongate member 31 to prevent counter rotation of the drill tip 40.
  • Drill tip 40 comprises a tapered lower edge 44.
  • Drill tip 40 is attached to the first end, via external thread 33.
  • Drill tip 40 protrudes beyond expansion shells 38 and is dimensioned to drill a hole of sufficient diameter to receive rock bolt 30.
  • Flushing hole, or channel, 43 and access holes 36 and 42 allow influx and efflux of materials during drilling to assist the drilling process. Drilling is actuated by attachment of a drilling mechanism, or apparatus, to drive element 35.
  • the drilling mechanism When a hole of the required depth has been drilled, the drilling mechanism is counter-rotated, screwing external thread of the first end of first elongate member 31 into thread 41 to urge drill tip 40 against expansion shells 38 causing expansion shells 38 to expand. Plate member 45 stops any further relative rotation of the drill tip 40 to prevent first elongate member being rotated out of drill tip 40 during drilling.
  • FIG. 5a shows a further rock bolt 50 of the invention.
  • Rock bolt 50 comprises a first elongate member, or shaft, 51 and a second elongate member, or sleeve, 52.
  • First elongate member 51 is disposed partially, longitudinally inside second elongate member 52.
  • First elongate member 51 comprises a first end 53, and a second end 54, which is adapted to receive a nut, or collar piece, 54a that can receive a drill actuating means, or drilling apparatus, (not shown).
  • Second end 54 comprises transversely oriented plate member 55 installed so that the nut 54a cannot be removed.
  • First elongate member 51 also comprises longitudinal grooves 56.
  • Rock penetrating means in the form of drill bit means 60 is adapted to be butt welded at end 61 to first end 53 of first elongate member 51.
  • Drill bit means 60 comprises a cutting head, or drill tip, 62 and an external thread 64 that matches internal thread 65 inside tapered collar, or engaging surface, 63.
  • the wider part of tapered collar 63 is disposed towards cutting head 62 and the narrower part towards end 61 and comprises access holes, or channels, 66.
  • tapered collar 63 of drill bit means 60 comprises channels 67 and an internal thread 65 as shown in the cross section of Figure 5a taken along the line A-A.
  • Drill bit means 60 is butt-welded to end 53.
  • the rock bolt 70 comprises a first elongate member, or shaft, 71 and a second elongate member, or sleeve, 72.
  • First elongate member 71 is disposed partially, longitudinally inside second elongate member 72.
  • First elongate member 71 comprises a first end 73A, and a second end 73B, which is adapted to receive nut, or collar piece, 54a that can receive a drill actuating means, or drilling apparatus, (not shown).
  • Second end 73B comprises a substantially T shaped bore 55A to allow influx and efflux of materials during drilling to assist the drilling process.
  • first and second ends of the first and second elongate members 71 , 72 correspond to first and second ends of the rock bolt 70.
  • Nut 54a is welded to the first elongate member 71 so that the nut 54a cannot be removed and so that turning the nut 54a also turns the first elongate member 71.
  • the first end 73A of first elongate member 71 comprises means 74 adapted to penetrate rock in the form of a drill bit.
  • Drill bit means 74 comprises a cutting head or drill tip 75 and channels 76 to provide a return path for the flushing and grouting fluids, shown in the cross section of Figure 6c taken along the line A-A.
  • Drill bit 74 is suitably attached to the first end 73A of first elongate member 71 e.g. by brazing, butt-welding, forging or the like. Drill bit 74 protrudes beyond end 73C of second elongate member 72. Drill bit 74 is dimensioned to drill a hole of sufficient diameter to receive rock bolt 70. Second elongate member 71 is corrugated, the corrugation providing stress transfer between inner and outer surfaces of the second elongate member 71. The corrugations may be helical or radial and the depth of the corrugations is proportional to the radius of the second elongate member. Figure 6d shows the corrugations of second elongate member 72 in detail.
  • the second elongate member has corrugations on its inner and outer surface; the corrugation is defined by its peak 79a and trough 79b.
  • the corrugations have sufficient amplitude so that the notional centre line in Figure 6d enters the regions of both the peak 79a and trough 79b.
  • Bolts according to any of the embodiments described above and below may also include the corrugated second elongate member.
  • Second elongate member 72 is suitably held in place e.g. by: a tapered collar, or engaging surface; washer, or abutment member; or the like. Drilling is actuated by attachment of a drilling mechanism, or apparatus, [not shown] to nut 54a and rotating the first elongate member 71 and drill bit 74 in a first rotational direction. Engagement of the drill bit means 74 with the rock requires the application of longitudinal (axial) pressure against the rock face in conjunction with the rotational action of the drilling apparatus. During drilling the drill bit 74 is cooled with a cooling fluid, which is injected in a second cavity 78 between the rock face and second member 72. The cooling fluid flows into and out of the second cavity 78 between the rock face and second member.
  • Drilling is actuated by attachment of a drilling mechanism, or apparatus, [not shown] to nut, or collar piece, 54a and rotating the first elongate member 81 and drill bit means 84 in a first rotational direction. Engagement of the drill bit means 84 with the rock requires the application of longitudinal (axial) pressure against the rock face in conjunction with the rotational action of the drilling apparatus. During drilling, the drill bit means 84 is cooled with a fluid which is a cooling fluid, and which is injected through access channels 56 at the second end 83B of the first elongate member 81.
  • the first end 133A of first elongate member 131 comprises drill bit means 137 adapted to penetrate rock. Alternatively, the first end 133A may be adapted to receive a drill bit means to penetrate rock.
  • Drill bit means 137 comprises a cutting head, or drill tip, 138 and a tapered collar, or engaging surface, 136. The wider part of tapered collar 136 is disposed towards cutting head 138 and the narrower part towards first end 133C of second elongate member 132. Further, tapered collar 136 of drill bit means 137 comprises channels 139 to provide a return path for the flushing and grouting fluids, shown in the cross section of Figure 11a taken along the line A-A.
  • Third elongate member 131B comprises a first end 143A, and a second end 143B, comprising as attachment means a drive element 144 that can receive drill actuating means [not shown]. Second end 143B of third elongate member 131 B is further adapted to receive the nut, or collar piece, 145. Turning the drive element 144 also turns the third elongate member 131 B.
  • First end 143A of third elongate member 131B comprises internal thread 147 to engage and rotatably lock with the external thread 135 of Figure 11a as described above.
  • the third elongate member 131 B is locked to the first elongate member 131 such that rotation of the third elongate member 131 B in the first direction causes the same rotation of the first elongate member 131. In this way, rotation of the third elongate member in the first direction rotates the drill bit means and causes drilling to occur.
  • Second end 143B of third elongate member 131 B comprises an external thread 146 to rotatably lock internal thread of a fifth elongate member [not shown].
  • the depth of the hole is then extended by attachment of the drilling mechanism [not shown] to attachment means provided by drive element 123 which rotates now joined first and third elongate members 112, 112B and drill bit means 119 in a first rotational direction.
  • the drill bit means 119 is cooled with a cooling fluid, which is injected in the second cavity 110A which now extends between the rock face and the first and third elongate members 112, 112B.
  • the cooling fluid flows into and out of the first and second cavities 110A, 110B between the rock face and the first, and second, and third and fourth members 112, 112B, 113, 113B.

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)
  • Earth Drilling (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Piles And Underground Anchors (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Abstract

L'invention concerne un boulon d'ancrage (10) comportant un premier et un deuxième élément (11,12) allongés. Le premier élément allongé comprend une première extrémité (13) conçue pour pénétrer dans la roche et une seconde extrémité (14) conçue pour fournir une fixation a un dispositif d'actionnement. Le premier élément allongé est disposé au moins partiellement longitudinalement à l'intérieur du deuxième élément allongé. Le deuxième élément allongé peut-être conçu pour s'étendre transversalement sur au moins une partie de sa longueur pour l'ancrage du boulon d'ancrage en position. Une cavité peut-être formée entre le premier et le deuxième élément allongé, s'étendant entre la première et la seconde extrémité du premier élément allongé. La présente invention porte également sur des procédés pour percer la roche au moyen de ces boulons d'ancrage.
EP04735851A 2003-06-03 2004-06-03 Boulon d'ancrage Withdrawn EP1629178A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU2003902774A AU2003902774A0 (en) 2003-06-03 2003-06-03 Rock bolt
AU2004900773A AU2004900773A0 (en) 2004-02-16 Rock Bolt
PCT/AU2004/000736 WO2004106700A1 (fr) 2003-06-03 2004-06-03 Boulon d'ancrage

Publications (2)

Publication Number Publication Date
EP1629178A1 true EP1629178A1 (fr) 2006-03-01
EP1629178A4 EP1629178A4 (fr) 2007-06-20

Family

ID=33491213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04735851A Withdrawn EP1629178A4 (fr) 2003-06-03 2004-06-03 Boulon d'ancrage

Country Status (7)

Country Link
US (1) US20070269274A1 (fr)
EP (1) EP1629178A4 (fr)
JP (1) JP2006526718A (fr)
CA (1) CA2523185A1 (fr)
NO (1) NO20055186L (fr)
RU (1) RU2343287C2 (fr)
WO (1) WO2004106700A1 (fr)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT501875B1 (de) * 2005-06-07 2008-05-15 Alwag Tunnelausbau Gmbh Verfahren und vorrichtung zum bohren, insbesondere schlag- oder drehschlagbohren eines lochs in boden- oder gesteinsmaterial
MX2008012937A (es) 2006-04-06 2009-04-22 Garford Pty Ltd Perno movil de roca.
AU2007203409B2 (en) 2006-07-20 2009-10-22 Fci Holdings Delaware, Inc. Rock bolt
WO2008060211A1 (fr) * 2006-11-15 2008-05-22 Sandvik Intellectual Property Ab Boulon d'ancrage et dispositif d'ancrage
DE102006059891A1 (de) * 2006-12-19 2008-06-26 Minova International Ltd., Witney Anker mit Spreizelement und Verfüllmantel
US8137032B2 (en) 2006-12-19 2012-03-20 Minova International Limited Anchor with grout jacket
ITPC20070010A1 (it) * 2007-02-14 2008-08-15 Cesare Melegari Attrezzatura e metodo per la realizzazione di micropali nel terreno, in particolare per l'ancoraggio di tiranti attivi
AU2009270337A1 (en) * 2008-07-18 2010-01-21 Nupress Tools Pty Limited Stabilising rock masses
US7625155B1 (en) 2009-03-25 2009-12-01 Safe Overhead Systems, Inc. Mine roof cable bolt assembly
WO2011087948A1 (fr) * 2010-01-14 2011-07-21 Anthony John Spencer Spearing Boulon expansible taraudeur
US8584777B2 (en) * 2010-06-04 2013-11-19 Dover Bmcs Acquisition Corporation Rotational drill bits and drilling apparatuses including the same
CN101858225B (zh) * 2010-06-10 2011-10-12 北京中矿深远能源环境科学研究院 恒阻大变形锚杆
WO2011163449A1 (fr) 2010-06-24 2011-12-29 Nucor Steel Birmingham, Inc. Boulon d'armature fileté pouvant résister à la tension
EP2596200A2 (fr) * 2010-07-19 2013-05-29 Illinois Tool Works, Inc. Dispositif d'ancrage
DE102010043769B4 (de) * 2010-11-11 2015-07-09 Hilti Aktiengesellschaft Ankerbaugruppe, insbesondere für den Berg- und Tunnelbau
US9010165B2 (en) 2011-01-18 2015-04-21 Nucor Corporation Threaded rebar manufacturing process and system
AT13162U1 (de) * 2012-04-12 2013-07-15 Dywidag Systems Int Gmbh Verfahren zum Bohren von Löchern in Boden- bzw. Gesteinsmaterial und zum Festlegen eines Ankers in einem Bohrloch sowie Vorrichtung hierfür
SE539285C2 (sv) * 2013-02-07 2017-06-20 Rock Solutions North AB Bergbult
GB201308152D0 (en) * 2013-05-07 2013-06-12 Technical Services Team Ltd Self-Boring Shield Anchor Apparatus and Method
WO2015072828A1 (fr) * 2013-11-15 2015-05-21 Aguilar Vera Oscar Octavio Ancrage minier à filet sur la pointe
CL2014001002A1 (es) 2013-12-12 2014-11-28 Ncm Innovations Pty Ltd Perno de anclaje en roca que incluye un cuerpo cilindrico alargado que tiene, un primer extremo distal y un segundo extremo proximal opuesto, una porcion roscada en el segundo extremo, un primer anclaje situado en o al menos parcialmente situado en una primera porcion de extremo del cuerpo, un segundo anclaje, una primera porcion de vastago entre el primer y el segundo anclaje.
CN106460511B (zh) * 2014-06-13 2019-07-23 山特维克知识产权股份有限公司 摩擦锚杆
USD766142S1 (en) * 2014-06-16 2016-09-13 Pultron Composites Limited Tie rod and nut
SE538335C2 (sv) * 2014-09-25 2016-05-24 Northern Mining Products Ab Energiupptagande bergbult för ingjutning samt förfarande förtillverkning av en sådan bergbult
WO2016181219A1 (fr) * 2015-05-08 2016-11-17 Normet International Ltd. Boulon d'ancrage creux autoforeur ancré localement
GB201513485D0 (en) * 2015-07-30 2015-09-16 Ihc Engineering Business Ltd Anchoring device and method
PL3565954T3 (pl) * 2017-01-09 2022-12-12 Minova International Limited Kompozytowa podatna kotwa skalna z ulepszonym zakresem odkształcenia
RU174706U1 (ru) * 2017-04-19 2017-10-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный архитектурно-строительный университет" Нагельный стержень
DE102017108664B4 (de) * 2017-04-24 2022-11-10 Bochumer Eisenhütte GmbH & Co. KG Spreizhülsenanker mit verlorener Bohrkrone
RU2018129117A (ru) * 2017-08-14 2020-02-10 Рэттлджэк Инновейшнз Пти Лтд. Предохранительная пробка
PE20210740A1 (es) * 2018-05-03 2021-04-19 Epiroc Drilling Tools Ab Anclaje para roca hibrido autoperforante
CN112324323B (zh) * 2020-10-30 2023-01-17 中航勘察设计研究院有限公司 一种注浆支护型钻锚一体机及锚固方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1369178A (fr) * 1963-09-05 1964-08-07 Procédé et dispositif d'ancrage applicable aux tiges de soutènement employées dans les mines, et pour tous autres scellements à sec
US4055051A (en) * 1976-01-08 1977-10-25 The United States Of America As Represented By The Secretary Of The Interior Unitary drill bit and roof bolt
DE8509145U1 (de) * 1985-03-27 1985-05-15 Ing. Günter Klemm, Spezialunternehmen für Bohrtechnik, 5962 Drolshagen Bohrvorrichtung
DE4036721A1 (de) * 1989-12-15 1991-06-20 Dalla Gassa Gaetano Valdagno Verfahren zum einfuehren von stangen oder rohren in boeden oder waende von hoehlen u. dgl. sowie vorrichtung zur durchfuehrung dieses verfahrens
DE19512122A1 (de) * 1995-04-04 1996-10-10 Reburg Patentverwertungs Gmbh Injektionsanker
DE19721857A1 (de) * 1997-05-26 1998-12-03 Fischer Artur Werke Gmbh Spreizanker
US6145601A (en) * 1997-06-18 2000-11-14 Techmo Entwicklungs-Und Vertriebs Gmbh Method and device for boring holes

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851560A (en) * 1972-10-02 1974-12-03 Deane C Self-drilling expansion roof bolt
SU826004A1 (ru) * 1979-09-12 1981-04-30 Melnikov Nikolaj Самозабуривающийс анкер
JPS6010100A (ja) * 1983-06-29 1985-01-19 山本　稔 自穿孔型ロツクボルト
JPS60242300A (ja) * 1984-05-14 1985-12-02 鉱研工業株式会社 ロツクボルトの施工法
US4744699A (en) * 1986-05-19 1988-05-17 Baker International Corporation Single-pass roof bolt and apparatus and method for installation
DE3724165A1 (de) * 1986-09-10 1988-03-24 Gd Anker Gmbh & Co Kg Gebirgsanker
JPS6376100A (ja) * 1986-09-19 1988-04-06 三菱電機株式会社 オ−ダ精算システム
GB2206172A (en) * 1987-06-25 1988-12-29 Coal Ind Rock bolts
NO176069C (no) * 1992-09-09 1999-06-25 Irsta Stolindustri As Anordning for forankring og gysing av bergbolt
AUPQ009799A0 (en) * 1999-04-30 1999-05-27 Raers Corporation Pty Ltd Drilling apparatus and method for single pass bolting
GB2352671B (en) * 1999-08-03 2003-06-18 Boart Longyear Ltd Shank adapter
AU717071B1 (en) * 1999-10-29 2000-03-16 Sandvik Intellectual Property Ab Self drilling roof bolt
JP4311872B2 (ja) * 2000-10-23 2009-08-12 株式会社ティーエフティー 自穿孔ロックボルト装置及び自穿孔ロックボルト工法
SE0100915L (sv) * 2001-03-15 2002-09-16 Atlas Copco Rock Drills Ab Förfarande vid förstärkning av berg och jordmassor samt bergbult för utövande av förfarandet
JP3878104B2 (ja) * 2002-10-17 2007-02-07 エスティーエンジニアリング株式会社 削孔ロッドを用いた二重管掘りロックボルトの構築方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1369178A (fr) * 1963-09-05 1964-08-07 Procédé et dispositif d'ancrage applicable aux tiges de soutènement employées dans les mines, et pour tous autres scellements à sec
US4055051A (en) * 1976-01-08 1977-10-25 The United States Of America As Represented By The Secretary Of The Interior Unitary drill bit and roof bolt
DE8509145U1 (de) * 1985-03-27 1985-05-15 Ing. Günter Klemm, Spezialunternehmen für Bohrtechnik, 5962 Drolshagen Bohrvorrichtung
DE4036721A1 (de) * 1989-12-15 1991-06-20 Dalla Gassa Gaetano Valdagno Verfahren zum einfuehren von stangen oder rohren in boeden oder waende von hoehlen u. dgl. sowie vorrichtung zur durchfuehrung dieses verfahrens
DE19512122A1 (de) * 1995-04-04 1996-10-10 Reburg Patentverwertungs Gmbh Injektionsanker
DE19721857A1 (de) * 1997-05-26 1998-12-03 Fischer Artur Werke Gmbh Spreizanker
US6145601A (en) * 1997-06-18 2000-11-14 Techmo Entwicklungs-Und Vertriebs Gmbh Method and device for boring holes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2004106700A1 *

Also Published As

Publication number Publication date
RU2343287C2 (ru) 2009-01-10
CA2523185A1 (fr) 2004-12-09
NO20055186D0 (no) 2005-11-04
RU2005141565A (ru) 2006-09-10
NO20055186L (no) 2006-02-17
WO2004106700A1 (fr) 2004-12-09
US20070269274A1 (en) 2007-11-22
JP2006526718A (ja) 2006-11-24
EP1629178A4 (fr) 2007-06-20

Similar Documents

Publication Publication Date Title
WO2004106700A1 (fr) Boulon d'ancrage
AU2006317519B2 (en) Self drilling rock bolt
CN107820533B (zh) 局部锚固的自钻式中空岩石锚杆
RU2458226C2 (ru) Пустотелый анкерный болт, самозабуривающийся анкерный болт и способ формования пустотелого анкерного болта
CA2638725C (fr) Boulon de roche autoforeur
AU667758B2 (en) Non-metallic reinforcing rod and method of use in supporting a rock formation
WO1996007015A1 (fr) Boulon d'encrage dans la roche et son procede de mise en place
US5374140A (en) Drillable ground support bolt
AU2004243343B2 (en) Rockbolt
AU2008235258A1 (en) Extendable member
CN100552188C (zh) 岩栓
AU2007221783B2 (en) Rock bolt
AU652765B2 (en) Drillable ground support bolt
WO2004063531A1 (fr) Remise sous tension d'un boulon d'ancrage
AU755716B2 (en) Rock bolt with keying deformations
JP2022164110A (ja) ロックボルト構造体及び地山補強構造
AU2021218166A1 (en) Rock bolt
AU2013204193B2 (en) A cable bolt assembly
AU2242599A (en) A rock bolt and method of installing a rock bolt
AU1014602A (en) Rock bolt and installing method

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20051007

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20070523

17Q First examination report despatched

Effective date: 20070712

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20110104