WO2008060212A1 - Outil à percer, boulon d'ancrage autoperceur, trépan, dispositif d'ancrage pour boulon d'ancrage autoperceur, arbre d'outil à percer et couplage d'extrémité pour outil à percer - Google Patents

Outil à percer, boulon d'ancrage autoperceur, trépan, dispositif d'ancrage pour boulon d'ancrage autoperceur, arbre d'outil à percer et couplage d'extrémité pour outil à percer Download PDF

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Publication number
WO2008060212A1
WO2008060212A1 PCT/SE2007/000938 SE2007000938W WO2008060212A1 WO 2008060212 A1 WO2008060212 A1 WO 2008060212A1 SE 2007000938 W SE2007000938 W SE 2007000938W WO 2008060212 A1 WO2008060212 A1 WO 2008060212A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
drill bit
stop
mandrel
drilling
Prior art date
Application number
PCT/SE2007/000938
Other languages
English (en)
Other versions
WO2008060212A8 (fr
Inventor
Steven Weaver
Darren Webb
John Horsch
Matthew Kenny
Original Assignee
Sandvik Intellectual Property Ab
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 AU2006236010A external-priority patent/AU2006236010B2/en
Application filed by Sandvik Intellectual Property Ab filed Critical Sandvik Intellectual Property Ab
Priority to GB0907507A priority Critical patent/GB2456945B/en
Priority to DE112007002516T priority patent/DE112007002516T5/de
Priority to CN2007800424581A priority patent/CN101535597B/zh
Priority to CA002665345A priority patent/CA2665345A1/fr
Priority to US12/445,377 priority patent/US8403600B2/en
Publication of WO2008060212A1 publication Critical patent/WO2008060212A1/fr
Priority to NO20091376A priority patent/NO20091376L/no
Priority to ZA2009/02598A priority patent/ZA200902598B/en
Publication of WO2008060212A8 publication Critical patent/WO2008060212A8/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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • 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
    • E21D21/0026—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

  • a drilling tool a self-drilling rock bolt, a drill bit, an ancoring device for a self-drilling rock bolt, a shaft for a drilling tool and an end coupling for a drilling tool
  • the present invention relates to drilling tools and rock bolts suitable for use in the mining and tunnelling industry to provide roof and wall support.
  • the invention is suitable for use in hard rock applications as well as in softer strata, such as that often found in coal mines, and it is to be appreciated that the term "rock" as used in the specification is to be given a broad meaning to cover both these applications.
  • the invention further relates to a drill bit, drill shaft and associated coupling, and an anchoring device per se.
  • Roof and wall support is vital in 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 hole is drilled into the rock by a drill rod, which is then removed and a rock bolt is then installed in the drilled hole and secured in place typically using a resin or cement based grout.
  • a drilling tool that comprises first and second ends, a shaft extending between the ends, the first end having a drill bit to penetrate rock, the drill bit and the shaft having complementary threads, and a stop that limits rotation of the drill bit on the shaft to maintain the drill bit in loose threaded connection with the shaft during drilling in a first direction.
  • the stop limits the drill bit from rotating on the shaft so as to maintain a space between an end surface of the shaft and an end surface of the drill bit during drilling. In this way, the stop prevents binding of the drill bit onto the end of the shaft that could otherwise occur during drilling.
  • the stop comprises co-operating abutment surfaces, one surface disposed on the drill bit and the other surface disposed on the shaft.
  • one of the drill bit and the shaft is provided with a projection and the other with a recess, the projection and the recess having respective ones of the abutment surfaces that provide the stop.
  • the shaft is formed as a unitary structure, typically made from steel.
  • the shaft is made from multiple components.
  • the shaft includes a main portion and an end portion. The main and end portions are interconnected by an appropriate coupling (such as a threaded coupling) with the end portion including a distal end incorporating the threaded coupling to receive the drill bit and one of the co-operating abutment surfaces of the stop.
  • the main portion is a conventional drill rod
  • the end portion is provided as a coupling to allow for retro-fitting of the drill rod to include the stop.
  • the coupling is arranged to screw into the existing threaded coupling provided on the end of the drill rod which traditionally has been provided to accommodate the drill bit. In this way no modification is required to the drill rod to allow the drilling tool to include the stop.
  • a self drilling rock bolt comprising first and second ends, a shaft extending between the ends, and an anchoring device extending along a first part of the shaft adjacent the first end, the anchoring device having an internal thread that cooperates with an external thread on the shaft, the first end having a drill bit to penetrate rock during drilling in a first direction and a stop to limit the rotation of the anchoring device on the shaft to maintain the anchoring device in loose threaded connection on the shaft during drilling.
  • the stop limits the anchoring device from rotating on the shaft so as to maintain a space between an end surface of the anchoring device and an end surface of the drill bit during drilling.
  • the stop comprises cooperating abutment surfaces, one surface disposed on the drill bit and the other surface disposed on the anchoring device.
  • the second end is adapted to be connected to a drilling apparatus to allow rotation of, and thrust to, the bolt
  • the anchoring device comprising a mandrel, the mandrel being mounted to and cooperating with the external thread on the shaft and at least one expansion element overlaying the mandrel, wherein the at least one expansion element is operative to be displaced radially outwardly on rotation of the mandrel on the shaft in a direction that causes movement of the mandrel relative to the expansion element towards the second end, the rotation of the mandrel being arranged to occur on rotation of the shaft in a second direction opposite to said first direction.
  • An advantage of the stop according to this aspect of the invention when used in conjunction with an anchoring device of the above form is that the stop will inhibit jamming of the anchoring device with the drill bit which could otherwise occur during drilling when the shaft is rotating in the first direction. If the anchoring device did jam then activation of the anchoring assembly may not occur when the shaft is rotated in the opposite direction as the mandrel is required to rotate freely on the external thread of the shaft during this activation.
  • one of the cooperating abutment surfaces of the stop is provided directly on mandrel.
  • the at least one expansion element is joined to a connector forming an anchor assembly that is arranged to be captured between the end surface of the drill bit and the end surface of the shaft.
  • one of the cooperating abutment surfaces of the stop is provided on the connector.
  • the stop is arranged to adopt a disengaged condition when the connector is disposed on the shaft end so that the stop does not prevent rotation of the anchoring device on the shaft and an engaged condition where the connector is spaced from the shaft end. In this engaged condition the stop is active to prevent the anchor assembly from rotating about the shaft thereby preventing the mandrel from moving axially towards the drill bit during drilling.
  • the stop is caused to move from the disengaged condition to the engaged condition on movement of the mandrel into a predetermined position.
  • the mandrel typically projects above the shaft end and is moved into position under rotation of the mandrel about the shaft in the direction that induces axial movement of the mandrel towards the drill bit.
  • the stop is caused to move from its engaged condition to the disengaged condition on movement of the mandrel from the predetermined position under the opposite rotation of the mandrel.
  • one of the drill bit and the anchoring device is provided with a projection and the other with a recessed surface, the projection and the recessed surface having respective ones of the abutment surfaces that provide the stop.
  • the recessed surface is inclined at an acute angle relative to a shoulder surface of the drill bit or anchoring device in which that surface is formed.
  • the recessed surface houses the projection at least during drilling.
  • the recessed surface connects to at least one upstanding wall that forms one of the cooperating abutment surfaces and wherein the projection comprises a leading edge that forms the other abutment surface of the stop bit.
  • the recessed surface is inclined at an acute angle relative to the shoulder surface.
  • the magnitude of the angle is at least 20% greater than a pitch angle of an external thread formed on the shaft.
  • the projection has a maximum height that is less than the largest depth of the recessed surface.
  • a drill bit for a drilling tool comprising a bit body which includes means for cutting rock at one end and a drill bit shank which incorporates a thread, wherein the drill bit is provided with a shoulder surface in connection with the drill bit shank, wherein the shoulder surface forms part of a stop.
  • the stop comprises a recessed surface on the shoulder surface of the drill bit.
  • the recessed surface connects to at least one upstanding wall.
  • the recessed surface is inclined at an acute angle relative to the shoulder surface.
  • an anchoring device for a self drilling rock bolt for retaining the bolt when located in a drilled hole comprising a mandrel, and at least one expansion element overlaying the mandrel, wherein the at least one expansion element is displaced radially outwardly on a predetermined relative movement between the mandrel and the at least one expansion element, wherein the at least one expansion element is joined to a connector to form an anchor assembly, the anchor assembly being keyed to the mandrel, and the anchor assembly comprising part of a stop.
  • the stop is provided to stop the anchor assembly from rotating about an axis and prevent the mandrel from moving axially in one direction along a bolt shaft during drilling in a first direction.
  • the stop comprises a projection provided on the connector.
  • the projection comprises a leading edge.
  • the connector includes a body section and at least one connecting leg, each said leg carrying a tag.
  • the tag that is provided adjacent to an end of the leg and is integrated with the connector, the tag being adapted to be passive during drilling and active during anchoring of the anchoring device.
  • a shaft for a drilling tool including opposite first and second ends, and wherein the first end incorporates a shoulder surface that projects from the first end and forms part of a stop.
  • the first end further incorporates a threaded bore arranged to receive a drill bit having a shank with a complementary external thread.
  • the shaft comprises a main portion and an end portion, the main and end portions being interconnected and axially aligned and the end portion incorporating the first end of the shaft.
  • the present invention provides an end coupling for a drill rod, the end coupling having opposite first and second ends, a threaded shank formed along an end portion of the coupling and extending to the second end and wherein a shoulder surface projects from the first end and forms part of a stop.
  • Fig. 1 is a schematic perspective view of a drilling tool
  • Fig. 2 A is an exploded view of a first end of the drilling tool of Fig. 1;
  • Fig. 2B is another exploded view of the first end of the drilling tool of Fig. 1;
  • Fig. 3 is a side view of the first end of the drilling tool of Fig. 1;
  • Fig. 4 is a sectional view of the first end of the drilling tool of Fig. 1 when located in rock strata;
  • Fig. 5 A is a top view of a connector of the drilling tool of Fig. 1 partly in a collapsed condition and partly in an expanded condition;
  • Fig. 5B is a side view of a connector of the drilling tool of Fig. 1 partly in a collapsed condition and partly in an expanded condition;
  • Fig. 6 A is a bottom view of a drill bit of the drilling tool of Fig. 1 ;
  • Fig. 6B is a side view of a drill bit of the drilling tool of Fig. 1
  • Fig. 7 A is a side view of the drilling tool of Fig. 1 with the drill bit disengaged with the connector of Figs. 5 A and 5B;
  • Fig. 7B is the drilling tool of Fig. 7 A with the drill bit engaged with the connector;
  • Fig. 8 A is a side view of an alternative drilling tool
  • Fig. 8B is a cross-sectional view of the drilling tool in Fig. 8 A
  • Fig. 9 is a schematic perspective view of a further alternative drilling tool
  • Fig. 10 is a side view of a drill shaft for further alternative drilling tool
  • Fig.11 is a cross-sectional view of the drill shaft of Fig. 10;
  • Fig. 12 is perspective view of an end coupling of the drill shaft of Fig. 10.
  • Fig. 1 illustrates a self drilling rock bolt 10 which incorporates a first (drilling) end 11 and a second (nut) end 12 and a shaft 13 which extends between the opposite ends 11, 12.
  • the shaft 13, which is typically made from steel, is solid along a major (second) part of its length and incorporates an inner passage 14 (see Fig. 4) along a distal (first) part of bolt adjacent the drilling end.
  • the inner passage communicate with the exterior of the shaft at two places; though a lateral port 60, and through an end port 61.
  • the self drilling rock bolt 10 is connected to a drilling and bolting apparatus (not shown) and acts as a drill rod to drill a hole 100 (see Fig. 4) into rock strata 500. Thereafter, the rock bolt 10 is secured in place as will be explained in more detail below to provide support for the rock strata 500.
  • the drilling end 11 incorporates a drill bit 15 incorporating a drill tip 16 at an end thereof and an anchoring device 23 which in use is arranged to retain the bolt in a drilled hole.
  • the anchoring device 23 extends along the first part of the bolt and is used to retain the bolt 10 in the drilled hole so as to temporarily secure the rock bolt in place prior to the introduction of grout into the hole 100 to permanently fix the bolt in place and/or to tension the bolt so as to place the rock strata 500 in compression.
  • the details of the drilling end 11 are best seen in Figs. 2 A to 6B.
  • the drilling apparatus typically induces right hand rotation to the drill shaft.
  • the threaded coupling between the drill bit 15 and the shaft 13 is a right handed thread so as to tend to cause the threaded coupling between the drill bit and shaft to tighten during a drilling operation.
  • the drill bit 15 includes a bit body 17 which includes the drill tip 16 at its outer end and a drill bit shank 18 which incorporates a fastening means such as an external thread 22 on its outer surface.
  • a passage 19 extends from the distal tip of the shank 18 through to the distal end of the bit body 17. This passage 19 is arranged to be in fluid communication with end port 61 of the inner passage 14 of the shaft when the drill bit 15 is secured to the shaft end 20 (as best seen in Fig. 4).
  • the shaft end 20 includes an inner thread 21 (see Fig. 4) which is complementary to the external thread 22 on the drill bit shank 18. As such, the drill bit 15 can be simply screwed on to shaft end 20 of the shaft 13.
  • the drill bit 15 is provided with a lower end surface 80 in connection with the drill bit shank 18.
  • the end surface 80 extends substantially perpendicularly to the drill bit shank.
  • the shoulder surface faces towards the shaft 13 when the drill bit has been mounted.
  • the shoulder surface comprises at least one recessed surface 81 that incorporates an upstanding wall 82.
  • the recessed surface 81 is in the illustrated form generally parallel to the lower surface 80 but in another form may be inclined at an acute angle a (shown in Fig.6B) relative to the lower end surface.
  • the magnitude of the angle ⁇ needs to be greater than a pitch angle of the external thread formed on the drill shank.
  • the magnitude of the angle ⁇ is at least 20% greater than the pitch angle of an external thread 38 formed on the bolt shaft 13.
  • the recessed surface may incline similar to a left handed thread as opposed to the right handed thread 22 in Fig. 6B.
  • the upstanding wall 82 is to form part of a stop discussed more in detail below.
  • the anchoring device 23 is disposed below the drill bit 15 and includes a pair of expansion elements 24 which are designed to be caused to move outwardly from a retracted position as illustrated in the drawings to an expanded condition (not shown) wherein the expansion elements 24 engage the wall 101 of the drilled hole 100.
  • the expansion elements 24 are interconnected by a connector or a bail strap 25.
  • This connector is typically made from steel and includes a substantially circular body section 26 and connecting legs 27.
  • the connecting legs 27 are riveted (or otherwise fixed) to a proximal end 28 of the expansion elements 24.
  • the expansion elements are joined to the connector to form an anchor assembly.
  • the body section 26 is preferably substantially circular and comprises a central hole 84 to receive the drill bit shank 18.
  • the body section 26 is provided with at least one projection or upstanding tongue 83 at the surface facing towards the drill bit 15.
  • the tongue 83 is preferably punched out of the body section at a mid-area location, i.e. at a location in between the hole 84 and a periphery of the body section.
  • the tongue 83 has a general V-shape as best seen in Fig. 5B but may have any suitable shape such as a U-shape or semicircular.
  • the tongue has a maximum height that is less than the largest depth of the recessed surface 81.
  • the tongue comprises a leading edge 85, i.e. leading if the connector is rotated in the left hand direction.
  • the leading edge 85 is substantially perpendicular to a plane of the body section 26.
  • the tongue is to be received by the recessed surface 81 and can abut against the upstanding wall 82 during drilling.
  • the tongue is to form part of the first relative rotation stop means discussed more in detail below.
  • each leg 27 may carry a second stop or leading tag 42 A, 42B, i.e. 'leading' if the connector 25 is rotated in the left hand direction.
  • the tag 42 A, 42B is provided adjacent to an end of the leg distal from the body section 26 and is integrated with the connector.
  • the tag 42 A is shown in a retracted position while the tag 42B is shown in an expanded position, for illustrative reasons.
  • the tag is adapted to be passive during drilling (right hand rotation) but active during anchoring (left hand rotation).
  • the geometries of the tags are optional.
  • the anchoring device 23 further includes a mandrel 29 which includes opposite inclined surfaces 30 and 31.
  • the mandrel 29 includes a head portion 32 and two depending legs 33 and 34 with opposite faces of the head portion 32 and opposite edge surfaces of the legs 33 and 34 forming respective ones of the inclined surfaces 30 and 31.
  • the head portion 32 may have two opposed grooves to house parts of the legs of the connector.
  • the mandrel is arranged so that the inclined surfaces 30 and 31 are generally flat and designed to abut with inner surfaces 35 of the expansion elements 24 in a manner such that relative movement of the mandrel towards the nut end 12 of the shaft causes the expansion elements to move from their retracted position to their extended position.
  • the mandrel is coupled to the bolt shaft which in the illustrated arrangement is through a threaded coupling with an internal thread 36 formed in an inner bore 37 in the head portion 32 of the mandrel 29 and an external thread 38 formed on the bolt shaft 13.
  • the threaded coupling between the mandrel 29 and the bolt shaft 13 is a left handed thread so that when the rock bolt is undergoing a drilling operation (under right hand rotation of the shaft), any relative motion between the mandrel and the shaft would cause the mandrel to move towards the drill end thereby ensuring that the expansion elements are not moved to their expanded condition. However if there is too much movement, the mandrel would force the connector hard against drill bit so that the mandrel could not rotate under left hand rotation thereby preventing activation of the anchor as the mandrel could not wind down the shaft.
  • the stop is provided by the cooperating abutment surfaces of the upstanding wall 81 and the tongue 83. This stop is active when these two surfaces move into engagement and limits the anchoring device from rotating on the shaft so as to maintain a space between an end surface of the anchoring device and an end surface of the drill bit during drilling.
  • Figs 7 A and 7B The operation of the stop is best illustrated in Figs 7 A and 7B.
  • a gap is provided between the lower surface 80 of the drill bit 15 and the end of the shaft 13. This gap is large enough so that when the connector is resting on the shaft end the upstanding wall 81 and tongue 83 are disengaged. Therefore the stop is not active and does not prevent any rotation of the mandrel 29 on the shaft.
  • the mandrel is caused to wind along the shaft in the direction of the drilling end 11, it will eventually lift the connector off the end of the shaft 13 thereby moving the tongue 83 into engagement with the upstanding wall 81 as shown in Fig 7B. This causes the stop to become active and prevents further rotation of the mandrel in that direction.
  • the anchoring device 23 may further comprise an annular band, not shown, which can be disposed around a distal end of the expansion elements 24.
  • the annular band is typically made from a polymeric or rubber material and is provided to hold the expansion elements 24 together only during transport and start of drilling.
  • the tags 42 A, 42B of the connector are arranged to adopt two conditions.
  • the tags 42 A, 42B are folded towards the mandrel 29. This condition occurs when the tags undergo right hand rotation as would be the case during the drilling operation.
  • the tags In the second condition as best illustrated to the right in Fig. 5 A, the tags project outwardly from the periphery of the connector 25. This occurs during the opposite rotation of the bolt and is induced by tags passing over the wall surface 101 of the drilled hole under this rotation.
  • this second (or expanded) condition there is a greater tendency for the tags to engage the wall surface of the drilled hole.
  • the anchoring device begins to slip relative to the shaft thereby inducing some relative movement. This movement, in turn causes the mandrel to start winding down the shaft thereby causing the expansion elements to be displaced outwardly.
  • the connector 25 performs several functions.
  • the first function is to hold the expansion elements a set distance axially from the end of the shaft.
  • the second function is to rotationally join the mandrel and the expansion elements together.
  • the third function is to provide a hole so that the drill bit can be threaded into the shaft.
  • the fourth function is to form part of a rotation stop that stops the mandrel from being screwed tightly against the drill bit.
  • the fifth function is to provide tags that grip the bore wall during anchoring, thus allowing the anchoring device to rotate relative to the shaft.
  • rock bolt 10 A variation of the rock bolt 10 is illustrated in Fig.9.
  • the rock bolt 50 includes many of the features of the bolt 10 and like features have been given like reference numerals.
  • an expansion assembly 51 is provided that includes the expansion elements 24 and a collar 52 disposed about the shaft 13 of the bolt 50.
  • the collar 52 functions in the same way as the connector 25 of the earlier embodiment and interconnects the proximal ends 28 of the expansion elements 24.
  • the expansion assembly 51 is orientated so that the distal ends 40 of the expansion elements face towards the drill end 11, rather than the nut end 12 as in the earlier embodiment.
  • the assembly 51 is seated on a retaining device 53 that comprises a thrust ring 54 that is axially fixed to the bolt shaft 13 and a slip ring 55 disposed between the thrust ring 54 and the collar 52.
  • the assembly 51 incorporates the mandrel 29 arranged so that its inclined surfaces 30 and 31 are designed to abut with inner surfaces 35 of the expansion elements 24. In this way relative rotation between the mandrel 29 and the expansion elements 24 about the shaft axis is inhibited. Further, relative movement of the mandrel 29 towards the nut end 12 of the shaft causes the expansion elements to move from their retracted position to their extended position. Furthermore, the mandrel is coupled to the bolt shaft by a threaded coupling (not shown).
  • the threaded coupling between the mandrel 29 and the bolt shaft 13 is a left handed thread so that when the rock bolt is undergoing a drilling operation (under right hand rotation of the shaft), any relative motion between the mandrel and the shaft would cause the mandrel to move towards the drill end thereby ensuring that the expansion elements are not moved to their expanded condition.
  • rotation of the expansion element is arranged to occur and whilst not shown, the anchor device 23 may also incorporate the band to promote this rotation. Because the mandrel portion 29 and the expansion assembly 51 rotate together, this rotation is translated to the mandrel 29, to activate the device 23 and cause movement of the mandrel towards the nut end 12.
  • the rock bolt 10 includes a sleeve 62 along a major part of the shaft 13.
  • the sleeve 62 extends from adjacent the anchoring device 23 through to and adjacent the nut end 12.
  • the purpose of the sleeve is to provide at least part of a circulation path to allow fluid to be passed from the nut end 12 to the drilling end 11. This circulation path is provided by a passage formed between the bolt shaft 13 and the sleeve 62 as well as the inner passage 14.
  • the inner passage 14 communicates with a passage formed between the shaft 13 and the sleeve 62 through the lateral port 60.
  • the circulation path also includes an outer passage 64 formed between the sleeve 62 and the wall 101 of the drilled hole 100. This outer passage is formed by having the drill tip 16 extend radially a distance greater than the radius of the sleeve 62.
  • the sleeve 62 is sealed at its distal end 65 by a collar 66. This collar 66 can incorporate an internal thread to be threaded onto the external thread 38 machined on the upper part of the shaft 13.
  • the proximal end 61 of the sleeve 62 is also sealed by inter engaging with a drive coupler 43 as described in detail in applicant's Australian patent application No.2006202778, which is hereby incorporated into the present specification.
  • a bearer plate and ball washer 72 may be disposed on the shaft 13 and captured by the drive nut 43.
  • the bearer plate is arranged to bear against the outer face of the rock strata 500.
  • the anchoring device 23 is threaded onto the shaft 13 suitably until the shaft end 20 abuts against the lower side of the body section 26 of the connector 25.
  • the drill bit 15 is threaded into the inner thread 21 of the shaft end until a drill bit shank end 86 engages a bottom 87 of the inner thread 21.
  • the bolt 10 is secured to a drilling apparatus, via the drive nut 43, which rotates the rock bolt in the first direction.
  • Drilling fluid is pumped around the circulation passage formed by passage between the shaft and the sleeve 62, inner passage 60, and outer passage 64 to flush the rock cutting surface of the rock bolt.
  • the fluid is either introduced or withdrawn from a port in the irrigated drive nut 43.
  • the drilling apparatus then rotates the bolt in the opposite direction.
  • the drive nut 43 rotates with the shaft 13 as relative movement is prevented by a torque pin.
  • This causes the tags 42 (if present) to flare outwards causing the connector to grip the wall surface 101 causing the expansion elements 24 and mandrel 29 to start to slip relative to the bolt shaft.
  • This relative movement induced between the anchoring device and the shaft causes the mandrel to wind down the thread of the shaft thereby causing the expansion elements to displace radially outwardly to engage the rock surface of the drilled hole.
  • the bolt When the expansion elements are engaged with the wall surface, the bolt is placed in tension by continuing to apply torque in the second direction to the drive nut 43. At a particular point, the expansion elements 24 are forced so hard against the rock wall surface that the mandrel cannot move down the shaft any further. This then effectively binds the bolt and inhibits it from rotating any further. This builds up the torque at the drive nut 43 until it reaches a point where it will shear a torque pin thereby letting the drive nut to move relative to the shaft. This relative movement then causes the nut to wind up the shaft.
  • the drive nut Once the drive nut is able to move along the bolt shaft, it will then move into engagement the outer face of the rock strata 500 (either directly or through the bearer plate) which will then enable the bolt to be placed in tension as the effective length of the bolt between the drive nut and the anchoring device is shortened. Once the bolt is under sufficient tension, the drilling apparatus can then be removed and possibly for further support a final stage of setting the bolt in place by the introduction of the grout through a port in the drive nut 43 can take place.
  • the drilling tool comprises first and second ends (the latter not shown), a shaft 13' extending between the ends.
  • the first end having a drill bit 15' to penetrate rock.
  • the drill bit 15' and the shaft 13' have complementary threads 22' and 21 ', respectively.
  • a shoulder surface 80' of the drill bit and an end of the shaft comprise a relative rotation stop that ensures that the drill bit remains loose during drilling in a first direction.
  • loose means that the uncoupling torque is not more than 10 % of the coupling torque, i.e. there is no need for a wrench or hammer to disassemble the drilling tool, only the use of hand power.
  • One of the drill bit and the shaft is provided with a projection 83' and the other with a recess 81 '.
  • the projection and an upstanding wall 82 ' of the recess 81 ' abut to stop relative rotation of the drill bit and the shaft.
  • the threads 21' and 22' are matched such that the projection 83' will enter into the recess 81' to provide a minimum gap between the shoulder surface 80' of the drill bit and the end of the shaft 13'.
  • the projection and the recess have been described more closely above in connection with the previous embodiment.
  • FIG. 10 to 12 An alternative shaft 90 to the shaft 13' for the drilling tool of Figs. 8 A and 8B is illustrated in Figs. 10 to 12.
  • the shaft 90 includes a projection 91 on a first end 92 and incorporates an internal thread 93 which is arranged to receive the threaded shank of the drill bit 15'.
  • a drilling tool incorporating the shank 90 is able to function in the same way as the drilling tool shown in Figs. 8A and 8B.
  • the shaft 90 includes a major portion 94 and an end portion 95. These portions 94 and 95 are axially aligned with the end portion 95 incorporating the threaded coupling 93 to receive the drill bit and the projection 91 on its distal end.
  • the main portion 94 is a conventional drill rod and includes a drive element 98 formed adjacent the second end 99 which is arranged to be connected a drilling apparatus to provide rotation and thrust to the drilling tool.
  • the end portion 95 is in the form of an end coupling incorporates a threaded shank 96 (as best seen in Fig. 12) arranged to screw into a threaded bore 97 provided on the end of the drill rod 94. This threaded bore 97 is provided to accommodate a drill bit in a conventional drill rod configuration.
  • the end coupling 95 which is typically formed as a cast component provides a simple arrangement to convert a conventional drill rod into one that can incorporate the stop mechanism as described above.
  • the end coupling 95 can be retro-fitted without requiring any modification to the drill rod 94.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

L'invention concerne un outil à percer (10) comportant une première et une seconde extrémité, un arbre (13, 90) s'étendant entre les extrémités. La première extrémité possède un trépan (15) pour pénétrer dans la roche. Ledit trépan et l'arbre possèdent des filets complémentaires. Le trépan et l'arbre comprennent un moyen d'arrêt de rotation correspondant (82, 83) qui assure que le trépan demeure mobile pendant le perçage dans une première direction. L'invention concerne en outre un boulon d'ancrage autoperceur (10), un trépan (15), un arbre de perçage (13, 90) et un couplage d'arbre (94), un dispositif d'ancrage (23), et un couplage d'extrémité (95) en tant que tel.
PCT/SE2007/000938 2006-11-15 2007-10-26 Outil à percer, boulon d'ancrage autoperceur, trépan, dispositif d'ancrage pour boulon d'ancrage autoperceur, arbre d'outil à percer et couplage d'extrémité pour outil à percer WO2008060212A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB0907507A GB2456945B (en) 2006-11-15 2007-10-26 A drilling tool, a self-drilling rock bolt, a drill bit, an ancoring device for a self-drilling rock bolt, a shaft for a drilling tool and an end coupling for
DE112007002516T DE112007002516T5 (de) 2006-11-15 2007-10-26 Bohrwerkzeug, selbstbohrender Gesteinsanker, Bohrer, Verankerungsvorrichtung für einen selbstbohrenden Gesteinsanker, Schaft für ein Bohrwerk und Endkupplung für ein Bohrwerkzeug
CN2007800424581A CN101535597B (zh) 2006-11-15 2007-10-26 钻具、自钻式岩石锚杆、用于自钻式岩石锚杆的锚定装置、用于钻具的轴以及用于钻具的端部联接器
CA002665345A CA2665345A1 (fr) 2006-11-15 2007-10-26 Outil a percer, boulon d'ancrage autoperceur, trepan, dispositif d'ancrage pour boulon d'ancrage autoperceur, arbre d'outil a percer et couplage d'extremite pour outil a percer
US12/445,377 US8403600B2 (en) 2006-11-15 2007-10-26 Drilling tool, a self-drilling rock bolt, a drill bit, an anchoring device for a self-drilling rock bolt, a shaft for a drilling tool and an end coupling for a drilling tool
NO20091376A NO20091376L (no) 2006-11-15 2009-04-03 Boreverktoy, en selvborende fjellbolt, en borkrone, en forankringsanordning for en selvborende fjellbolt, et skaft for et boreverktoy og en endekopling for et boreverktoy
ZA2009/02598A ZA200902598B (en) 2006-11-15 2009-04-15 A drilling tool,a self-drilling rock bolt,a drill bit,an ancoring device for a self-drilling rock bolt,a shaft for a drilling tool and an end coupling for a drilling tool

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU2006236010A AU2006236010B2 (en) 2006-11-15 2006-11-15 A drilling tool, a self drilling rock bolt, a drill bit and an anchoring device
AU2006236010 2006-11-15
AU2006236012 2006-11-15
AU2006236012A AU2006236012B2 (en) 2006-11-15 2006-11-15 A rock bolt and an anchoring device

Publications (2)

Publication Number Publication Date
WO2008060212A1 true WO2008060212A1 (fr) 2008-05-22
WO2008060212A8 WO2008060212A8 (fr) 2009-05-14

Family

ID=39401929

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2007/000938 WO2008060212A1 (fr) 2006-11-15 2007-10-26 Outil à percer, boulon d'ancrage autoperceur, trépan, dispositif d'ancrage pour boulon d'ancrage autoperceur, arbre d'outil à percer et couplage d'extrémité pour outil à percer

Country Status (6)

Country Link
CN (2) CN101535598B (fr)
AU (1) AU2006236012B2 (fr)
GB (1) GB2456945B (fr)
NO (1) NO20091376L (fr)
WO (1) WO2008060212A1 (fr)
ZA (1) ZA200902598B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
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WO2010006374A1 (fr) * 2008-07-18 2010-01-21 Nupress Tools Pty Limited Stabilisation de masses rocheuses
WO2012015349A1 (fr) * 2010-07-30 2012-02-02 Sandvik Intellectual Property Ab Boulon d'ancrage et dispositif d'ancrage
AU2008230002B2 (en) * 2008-06-25 2012-05-03 Sandvik Intellectual Property Ab A cuttable drilling tool, and a cuttable self drilling rock bolt
WO2012012401A3 (fr) * 2010-07-19 2012-12-06 Illinois Tool Works Inc. Dispositif d'ancrage
US10364618B2 (en) 2011-01-26 2019-07-30 Bly Ip Inc. Drill string components resistant to jamming
US10570676B2 (en) 2011-01-26 2020-02-25 Bly Ip Inc. Drill string components having multiple-thread joints
CN117499861A (zh) * 2023-12-29 2024-02-02 济宁勤昌工贸有限公司 一种基于传感器采集的边坡锚固钻机施工钻头定位方法

Families Citing this family (4)

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RU2444630C2 (ru) 2006-11-15 2012-03-10 Сандвик Интеллекчуал Проперти Аб Анкерный болт и анкерное устройство
US10557316B2 (en) 2011-01-26 2020-02-11 Bly Ip Inc. Drill string components having multiple-thread joints
DE102013012714A1 (de) * 2013-08-01 2015-02-05 Deilmann-Haniel Mining Systems Gmbh Einsteckende für ein Bohr- und Ankersetzgerät
CN105350994B (zh) * 2015-10-28 2017-10-03 天地科技股份有限公司 一种注浆锚杆及其使用方法

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US4902047A (en) * 1989-04-14 1990-02-20 Vetco Gray Inc. Thread connector anti-rotation device
US20010018990A1 (en) * 2000-03-02 2001-09-06 Bengt Asberg Rock drill bit having retrac teeth and method for its manufacturing
WO2004067902A1 (fr) * 2003-01-30 2004-08-12 Atlas Copco Rock Drills Ab Manchon de couplage de connexion d'un boulon filete a une machine perforatrice de roches a impacts

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DE4341378A1 (de) * 1993-12-04 1995-06-08 Fischer Artur Werke Gmbh Bohrvorrichtung mit radial auslenkbarer Bohrspindel
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AU2006312998B2 (en) * 2005-11-09 2008-01-17 Sandvik Intellectual Property Ab Self drilling rock bolt

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EP0099293A2 (fr) * 1982-07-07 1984-01-25 Marinovation Procédé de verrouillage de deux éléments vissés, éléments et dispositif pour mettre en oeuvre ce procédé
US4902047A (en) * 1989-04-14 1990-02-20 Vetco Gray Inc. Thread connector anti-rotation device
US20010018990A1 (en) * 2000-03-02 2001-09-06 Bengt Asberg Rock drill bit having retrac teeth and method for its manufacturing
WO2004067902A1 (fr) * 2003-01-30 2004-08-12 Atlas Copco Rock Drills Ab Manchon de couplage de connexion d'un boulon filete a une machine perforatrice de roches a impacts

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2008230002B2 (en) * 2008-06-25 2012-05-03 Sandvik Intellectual Property Ab A cuttable drilling tool, and a cuttable self drilling rock bolt
WO2010006374A1 (fr) * 2008-07-18 2010-01-21 Nupress Tools Pty Limited Stabilisation de masses rocheuses
WO2012012401A3 (fr) * 2010-07-19 2012-12-06 Illinois Tool Works Inc. Dispositif d'ancrage
WO2012015349A1 (fr) * 2010-07-30 2012-02-02 Sandvik Intellectual Property Ab Boulon d'ancrage et dispositif d'ancrage
US10364618B2 (en) 2011-01-26 2019-07-30 Bly Ip Inc. Drill string components resistant to jamming
US10570676B2 (en) 2011-01-26 2020-02-25 Bly Ip Inc. Drill string components having multiple-thread joints
US11898404B2 (en) 2011-01-26 2024-02-13 Boart Longyear Company Drill string components having multiple-thread joints
CN117499861A (zh) * 2023-12-29 2024-02-02 济宁勤昌工贸有限公司 一种基于传感器采集的边坡锚固钻机施工钻头定位方法
CN117499861B (zh) * 2023-12-29 2024-03-22 济宁勤昌工贸有限公司 一种基于传感器采集的边坡锚固钻机施工钻头定位方法

Also Published As

Publication number Publication date
CN101535597B (zh) 2013-10-02
CN101535598B (zh) 2013-06-19
GB0907507D0 (en) 2009-06-10
GB2456945B (en) 2011-04-06
AU2006236012B2 (en) 2009-06-04
ZA200902598B (en) 2014-09-25
GB2456945A (en) 2009-08-05
CN101535597A (zh) 2009-09-16
CN101535598A (zh) 2009-09-16
AU2006236012A1 (en) 2008-05-29
NO20091376L (no) 2009-08-06
WO2008060212A8 (fr) 2009-05-14

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