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US20180003057A1 - Drill Bit for Use with a Friction Bolt - Google Patents

Drill Bit for Use with a Friction Bolt Download PDF

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Publication number
US20180003057A1
US20180003057A1 US15/548,553 US201615548553A US2018003057A1 US 20180003057 A1 US20180003057 A1 US 20180003057A1 US 201615548553 A US201615548553 A US 201615548553A US 2018003057 A1 US2018003057 A1 US 2018003057A1
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US
United States
Prior art keywords
drill bit
friction bolt
drill
leading end
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/548,553
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English (en)
Inventor
Matthew David McLaren
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.)
Fero Group Pty Ltd
Original Assignee
Fero Group 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 AU2015900337A external-priority patent/AU2015900337A0/en
Application filed by Fero Group Pty Ltd filed Critical Fero Group Pty Ltd
Assigned to FERO GROUP PTY LTD reassignment FERO GROUP PTY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MCLAREN, MATTHEW DAVID
Publication of US20180003057A1 publication Critical patent/US20180003057A1/en
Abandoned legal-status Critical Current

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    • 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
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • 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
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally

Definitions

  • the present invention relates to drilling tools and assemblies for installing friction bolts and more particularly drill bits for drill tools and assemblies for installing friction bolts.
  • the present invention also relates to friction bolts and methods of drilling involving friction bolts.
  • Friction bolts are used to stabilise rooves and walls during underground mining and most often have a generally cylindrical body, a collar at the trailing end of the body and a tapered leading end portion of the body that assists in inserting the friction bolt into a bore hole.
  • Friction bolts often include a split down one side so that when they are driven into a slightly undersized hole in the rock strata, the rock bolt resiliently deforms to reduce the size of the split in the body. This resilient deformation exerts radial and frictional forces against the wall of the hole to retain the friction bolt within the hole and to reinforce the rock strata.
  • the collar enables a rock bearing plate to be fitted to the body directly above the collar such that the collar bears the rock bearing plate against the rock face of the mine to distribute axial loads carried by the friction bolt.
  • Friction bolts can be installed in a two step process where the first step involves drilling a hole with one drill tool and the second step involves inserting the friction bolt with another tool. This two step process, whilst allowing for the recovery of the entire drill string used to drill the hole, is time consuming and otherwise inefficient.
  • Another one step solution for installing friction bolts involves the use of a self drilling friction bolt with an integrally provided drill bit. Once the friction bolt is installed with these systems the drill bit is retrieved leaving the friction bolt and the integrally provided drill bit in the hole.
  • the present invention seeks to provide an alternative that at least partially addresses one or more of the problems with existing friction bolt systems.
  • the present invention provides a drill bit for a drill assembly including a friction bolt defining a longitudinal axial passage, the drill bit being adapted to be releasibly attached to the friction bolt and comprising:
  • a drill bit assembly for use with a drill assembly including a friction bolt defining a longitudinal axial passage, the drill bit comprising:
  • drill bit and the drive member are adapted to be releasibly engaged with each other.
  • a drill string assembly comprising:
  • the present invention provides a drilling system comprising:
  • the present invention provides a friction bolt, defining a longitudinal axial passage, comprising a drill bit according to a first aspect of the present invention, releasibly engaged therewith.
  • the present invention provides a method for inserting a friction bolt according to a fifth aspect of the present invention into a formation.
  • FIG. 1A is an end view (from the leading end) of drill bit according to one embodiment of the first aspect of the present invention
  • FIG. 1B is an end view (from the following end) of the drill bit in FIG. 1A ;
  • FIG. 1C is an isometric view of the drill bit in FIG. 1A ;
  • FIG. 1D is a side view of the drill bit in FIG. 1A ;
  • FIG. 1 E is the view of cross section G-G in FIG. 1A ;
  • FIG. 1F is the view of cross section H-H in FIG. 1A ;
  • FIG. 2A is a perspective view of a friction bolt according to an embodiment of the fifth aspect of the present invention including the drill bit in FIG. 1A releasibly engaged therewith;
  • FIG. 2B is a detailed view of the leading end of the friction bolt in FIG. 2A illustrating the releasable engagement between the drill bit and the friction bolt;
  • FIG. 3A is a perspective view of a drill string assembly (without the friction bolt) according to an embodiment of the third aspect of the present invention showing a drive member in the form of a drill bit, that forms part of a drill bit assembly according a second aspect of the present invention, fitted on the drill rod of a drill string;
  • FIG. 3B is a perspective view of the drive member in the form of a drill bit referred to in FIG. 3A ;
  • FIG. 3C is and end view (from the leading end) of the drive member in FIG. 3B ;
  • FIG. 3D is the view of cross section F-F in FIG. 3C ;
  • FIG. 3E is a perspective view of a drive member in the form of a drill bit according to another embodiment of the drive member in FIGS. 3A-3D ;
  • FIG. 4 is a perspective view of a drilling system according to an embodiment of the fourth aspect of the present invention including the friction bolt of FIG. 2A and the drill string assembly of FIG. 3A ;
  • FIG. 5A is an isometric view of a drill bit according to another embodiment of the first aspect of the present invention.
  • FIG. 5B is an end view (from the leading end) of the drill bit in FIG. 5A ;
  • FIG. 5C is a side view of the drill bit in FIG. 5A ;
  • FIG. 6A is a perspective view of another drive member in the form of a drill bit, that could also form part of a drill bit assembly according to a second aspect of the present invention
  • FIG. 6B is and end view (from the leading end) of the drive member in FIG. 6A ;
  • FIG. 6C is the view of cross section A-A in FIG. 6B ;
  • FIG. 6D is the view of cross section B-B in FIG. 6B ;
  • FIG. 7A is an isometric view of the drill bit in FIG. 5A and the drive member in FIG. 6A aligned for releasable engagement;
  • FIG. 7B is an isometric view of the drill bit in FIG. 5A and the drive member in FIG. 6A releasibly engaged;
  • FIG. 7C is and end view (from the leading end) of the drill bit and drive member in FIG. 7B ;
  • FIG. 7D is the view of cross section K-K in FIG. 7C .
  • the present invention provides a drill bit for a drill assembly including a friction bolt defining a longitudinal axial passage, the drill bit being adapted to be releasibly attached to the friction bolt and comprising:
  • the manner in which the drill bit is attached to the friction bolt is important as it must be sufficiently positive to at least reduce and preferably avoid unintentional disengagement of the drill bit from the friction bolt.
  • the intent of the present invention is that the drill bit disengages from the friction bolt when drive, such as rotational and/or percussive drive, is applied to the drill bit.
  • drive such as rotational and/or percussive drive
  • friction bolt refers to a generally cylindrical structure adapted to be inserted into a rock or other formation to provide reinforcement. Friction bolts employ a range of measures to enable them to be deployed and provide the required reinforcement, the vast majority of which are based on the friction bolt being able to exert outward pressure on the hole into which they have been inserted.
  • One particular type of friction bolt that the drill bit of the present invention can be used with has a configuration when inserted into a formation or in situ (“stressed configuration”) where the width or diameter of the longitudinal axial passage therein is reduced relative to the width or diameter of the longitudinal axial passage prior to insertion of the friction bolt (“relaxed configuration”).
  • leading and following for example in the phrases “leading end” and “following end” refer to positions relative to the drilling process. “Leading” as used herein refers to a feature or part thereof that is closest or proximal to the drilling interface whereas “following” refers to a feature or part thereof that is furthest or distal to the drilling interface.
  • the friction bolt engaging means comprises at least one recess. More preferably the friction bolt engaging means comprises a plurality of recesses adapted to releasibly engage with the leading end of the friction bolt. Preferably, the recess is adapted to releasibly engage with a portion of an inside lip of the leading end of the friction bolt.
  • the recesses are spaced equidistantly apart from each other.
  • the outer surface comprises three recesses.
  • the recess is located approximately halfway between the leading and trailing ends of the drill bit.
  • the recess comprises a channel member.
  • the drill bit may be of various shapes but preferably is formed of a body that is ring or cylinder shaped.
  • the drill bit comprises a longitudinal axial passage.
  • the outer cross sectional shape of the drill bit can be varied as required and can be elliptical, circular or oval or polygon shaped such as a triangle, square, rectangle or pentagon.
  • the outer surface of the drill bit tapers in towards its following end.
  • the tapered outer surface may comprise a taper of 4°-8°, 4°-7.5°, 4°-7°, 4°-6.5°, 4°-6°, 4°-5.5°, 4°-5°, 4°-4.5°, 4.5°-8°, 5°-8°, 5.5°-8°, 6°-8°, 6.5°-8°, 7°-8°, 7.5°-8°, 6°, 5.5° or 6.5°.
  • the outer surface of the drill bit includes one or more cut outs to reduce the amount of material used in the drill bit.
  • the drill bit may further comprise a socket, such as a tapered socket, extending at least partially between the leading end and the trailing end.
  • a socket such as a tapered socket, extending at least partially between the leading end and the trailing end.
  • the socket extends the entire distance between the leading and trailing ends such that the leading end of the drill bit includes a first aperture and the trailing end of the drill bit includes a second aperture.
  • the socket is adapted to releasibly receive a drive member for imparting rotational and/or percussive force on the drill bit. Even more preferably, the socket is adapted to releasibly receive a drive member in the form of a second drill bit.
  • the socket comprises at least one spline or groove extending at least partially between the leading and trailing ends. Even more preferably, the socket comprises three splines extending at least partially between the leading and trailing ends.
  • Suitable cross-sectional shapes of the socket include, but are not limited to elliptical, such as circular or oval cross-section.
  • the cross sectional shape of the socket may be polygonal such as a triangle, square or rectangle.
  • the cross sectional shape of the socket comprises a blunt triangular shape, such as a reuleaux triangular shaped cross section or a blunt reuleaux triangular shaped cross section.
  • the tapered socket When the socket is tapered it may taper in towards its leading end. Even more preferably the tapered socket comprises a taper of about 2.5°-5.0°, 2.5°-4.75°, 2.5°-4.5°, 2.5°-4.25°, 2.5°-4°, 2.5°-3.75°, 2.5°-3.5°, 2.5°-3.25°, 2.5°-3°, 2.75°-5.0°, 3°-5.0°, 3.25°-5.0°, 3.5°-5.0°, 3.75°-5.0°, 4°-5°, 4.25°-5°, 4.5°-5°, 4.75°-5°, 3.5°, 3.45°, 3.4°, 3.35°, 3.55°, 3.6° or 3.65°.
  • the drill bit is single use or disposable.
  • the drill bit comprises a cutting part comprising a button or blade type cutting element or a combination thereof.
  • the drill bit is not adapted to pass through the longitudinal axial passage in the friction bolt.
  • a drill bit assembly for use with a drill assembly including a friction bolt defining a longitudinal axial passage, the drill bit comprising:
  • drill bit and the drive member are adapted to be releasibly engaged with each other.
  • the drill bit and the drive member are releasibly engaged via a taper fit.
  • the drive member comprises a second drill bit.
  • the second drill bit comprises a shank, such as a tapered shank, that tapers in towards its leading end.
  • the taper of the tapered shank is compatible with the taper of the drill bit.
  • the tapered shank comprises a taper of about 2.5°-5.0°, 2.5°-4.75°, 2.5°-4.5°, 2.5°-4.25°, 2.5°-4°, 2.5°-3.75°, 2.5°-3.5°, 2.5°-3.25°, 2.5°-3°, 2.75°-5.0°, 3°-5.0°, 3.25°-5.0°, 3.5°-5.0°, 3.75°-5.0°, 4°-5°, 4.25°-5°, 4.5°-5°, 4.75°-5°, 3.5°, 3.45°, 3.4°, 3.35°, 3.55°, 3.6° or 3.65°.
  • the second drill bit may also comprise a tapered portion at its following end that tapers in towards the following end.
  • the second drill bit may also comprise at least one aperture to allow for the exit or assist in dislodging rocks or other debris that enters the space between the second drill bit and the inside wall of the friction bolt during the drilling process.
  • the at least one aperture may be located is the lateral surface of the following end of the second drill bit.
  • the at least one aperture may be a cut-out.
  • the at least one aperture may be generally “V” shaped, be jagged edged and/or have a saw tooth or zig-zag configuration.
  • the second drill bit comprises a cutting part comprising a button or blade type cutting element or a combination thereof.
  • the second drill bit may have an outer cross sectional shape that is compatible with the cross sectional shape of the tapered socket in the drill bit described above in respect of the first aspect of the invention.
  • the second drill bit comprises a generally polygonal cross section, such as a generally triangular cross section.
  • the second drill bit comprises a blunt triangular shape, such as a reuleaux triangular shaped cross section or a blunt reuleaux triangular shaped cross section. In this regard, instead of the points that are usually seen on a reuleaux triangle there are gentle curves.
  • the hardness of the second drill bit is greater than the hardness of the drill bit.
  • the second drill bit further comprises at least one conduit for delivering fluid to the drilling interface.
  • the second drill bit further comprises a second shank at its following end adapted to engage with a drill string.
  • the second shank is adapted to be threaded on to the drill string.
  • the second drill bit is multi-use or reusable.
  • the first and second drill bits releasibly engage to form an integral cutting surface.
  • the largest diameter or width of the drill bit assembly is defined by the diameter or width of the first drill bit.
  • This largest diameter will be predetermined based on operational requirements and, in particular, the diameter or width of the friction bolt in the drill assembly that the drill bit assembly is designed for use with.
  • the largest diameter or width of the drill bit assembly is slightly larger than internal diameter or width of the friction bolt in situ. This allows for the drill bit assembly to be used to drill a hole of a predetermined width to suit the friction bolt, and for the first drill bit to then be disengaged from the second drill bit so the second drill bit can be retrieved through the longitudinal axial passage in the friction bolt for re-use.
  • the second drill bit comprises an abutment means that is positioned to ensure the engagement between the first and second drill bits functions optimally when the drill bit assembly is in use.
  • a suitable abutment means can assist with the disengagement process as it provides a surface against which the first drill bit can be worked against to disengage the first and second drill bits from each other.
  • the abutment means such as a shoulder, prevents the first drill bit from being forced too far down the taper on the second drill bit.
  • the first drill bit continues to be forced against the abutment means which causes the engagement between the bits to be loosened which makes it easier to disengage them from each other when the drilling process is complete and the second drill bit is withdrawn from the hole.
  • the abutment means is a shoulder or lip on the outer surface of the second drill bit.
  • the shoulder or lip extends around the entire outer surface of the second drill bit.
  • the shoulder or lip may be tapered towards the leading end of the second drill bit or may be flat.
  • a drill string assembly comprising:
  • the present invention provides a drilling system comprising:
  • the present invention provides a friction bolt, defining a longitudinal axial passage, comprising a drill bit according to a first aspect of the present invention, releasibly engaged therewith.
  • the friction bolt can be varied as required, provided it is capable of releasibly engaging with a drill bit according to the first aspect of the present invention.
  • the leading end of the friction bolt is shaped and configured such that it is capable of releasibly engaging the drill bit.
  • the engagement between the friction bolt and the drill bit is such that the friction bolt and drill bit can be sold as an integral unit for use with a suitably designed drill string wherein they are only separated as part of the drilling process that installs the friction bolt.
  • the present invention provides a method for inserting a friction bolt according to a fifth aspect of the present invention into a formation.
  • the method comprises the steps of:
  • the drilling of the hole and insertion of the friction bolt occurs in a single pass.
  • the drill string assembly comprises a drill string assembly according to a third aspect of the invention.
  • said drilling results in said drill bit disengaging from said friction bolt.
  • the step of disengaging the drill bit from the drill string comprises the step of applying percussion to the drill string.
  • the step of disengaging the drill bit from the drill string comprises the step of stopping the percussion applied to the drill string and/or reversing the feed direction of the drill string.
  • the invention described herein may include one or more range of values (e.g. size etc).
  • a range of values will be understood to include all values within the range, including the values defining the range, and values adjacent to the range which lead to the same or substantially the same outcome as the values immediately adjacent to that value which defines the boundary to the range.
  • FIGS. 1A-1F depict a drill bit according to one embodiment of the first aspect of the present invention, generally indicated by the numeral 10 .
  • the drill bit 10 is generally ring shaped and defines a leading end (best depicted in FIG. 1A ) that defines a cutting part comprising six raised buttons formed of tungsten carbide that are formed into three evenly spaced pairs 12 a, 12 b and 12 c, a following end (best depicted in FIG. 1B ) and a tapered socket 14 that extends between the leading and following ends so that each end defines an aperture therein.
  • the main body of the drill bit 10 is formed of a suitable metal such as a 4140 grade metal.
  • the drill bit 10 is designed to be readily disposable after a single pass drilling to install a friction bolt. As the intention is for the drill bit 10 to be disposed of in the drill hole it is sized and shaped so as to not pass through the longitudinal axial passage in the friction bolt once installed.
  • the tapered socket 14 has a blunt reuleaux triangular shaped cross section, includes a taper 15 of about 3.5° in towards its leading end and is adapted to receive a drive member in the form of a drive means in the form of a second drill bit 40 (discussed in further detail below).
  • the outer cross sectional shape of the drill bit 10 is generally circular and the outside surface tapers in towards its following end at about 6 o.
  • the outer surface of the drill bit 10 includes three major cut outs 16 a, 16 b 16 c and three channels 18 a, 18 b (not shown) and 18 c that are evenly spaced and extend around the outer surface between each cut out 16 a, 16 b and 16 c.
  • the channels 18 a - 18 c are adapted to releasibly engage with the inside lip of the leading end of a friction bolt 22 (best depicted in FIG. 2B ) in a manner that allows the friction bolt 22 and drill bit 10 to form an integral unit (best depicted in FIG. 2A ) according to an embodiment of a fifth aspect of the present invention.
  • the outer surface of the drill bit 10 also includes three minor cut outs 19 a, 19 b, 19 c.
  • the cut outs 16 a - 16 c and 19 a - 19 c are made primarily to allow cuttings to be flushed away from the drilling face and escape past the face of the drill bit.
  • FIGS. 2A and 2B depict an embodiment of a friction bolt according to a fifth aspect of the present invention generally indicated by the numeral 20 and including a friction bolt 22 defining a longitudinal axial passage 24 and having a drill bit 10 releasibly engaged in its leading end.
  • the friction bolt 22 is resiliently deformable such that it can be driven into a drill hole during the drilling process and impart outward pressure on the inside of the drill hole once it is inserted.
  • the resiliently deformable characteristics of the friction bolt 22 are provided by the slot 24 in the friction bolt 22 that allows the friction bolt 22 to contract as it enters the drill hole during the drilling process.
  • the drill bit 10 is releasibly engaged in the leading end of the friction bolt 22 via a frictional engagement between channels 18 a - 18 c and the inside lip of the leading end of the friction bolt 22 .
  • This engagement is sufficiently positive to prevent the drill bit 10 and friction bolt 22 disengaging unintentionally but does allow for the components to be separated during the drilling process that installs the friction bolt 22 in a formation. This is discussed in more detail below but involves the drill bit 10 being detached from the drill string and left in the hole once the friction bolt has been installed in a formation and the remainder of the drill string (including the second drill bit—see below) being recovered and re-used to install the next friction bolt.
  • FIGS. 3A-3D depict one example of a drive member in the form of a second drill bit 40 that forms part of drill bit assembly according to an embodiment of the second aspect of the present invention.
  • FIG. 3A depicts the second drill bit 40 threaded on a drill rod 42 whereas FIGS. 3B-3D show the second drill bit 40 by itself.
  • the second drill bit 40 is designed to be reusable and comprises a cutting section 42 at its leading end and a shank 44 at its following end that includes a threaded portion 46 (see FIG. 3D ) to engage with a drill rod 42 (see FIG. 3A ).
  • the cutting section 42 also includes a tapered shank 48 with a blunt reuleaux triangle shaped cross section and tapers in at about 3.5° towards its leading end defining a tapered outer surface that is adapted to form a frictional engagement with the tapered socket 14 in the drill bit 10 and also includes a cutting part comprising cutting elements in the form of buttons 50 formed of tungsten carbide or some other suitable hard material.
  • the second drill bit 40 also includes conduits 52 delivering drilling fluid to the drill face during the drilling process, as required. The greatest outer width or diameter defined by the second drill bit 40 is such that the drill bit 40 is adapted to pass through the longitudinal axial passage in a friction bolt 20 .
  • FIGS. 3E depict another example of a drive member in the form of a second drill bit 140 that forms part of drill bit assembly according to an embodiment of the second aspect of the present invention.
  • FIG. 3E show the second drill bit 140 , by itself, and is similar in configuration to the second drill bit 40 in FIGS. 3A-3D but includes a different shank 144 that includes a skirt with an aperture in the form of a jagged edged or generally “V” shaped cut-out 151 located in the lateral surface of the following end of the shank 144 to allow for the exit of rocks or other debris that enters the space between the second drill bit and the inside wall of the friction bolt during the drilling process.
  • Multiple cut-outs 151 can be included around the perimeter of the following end of the shank 144 , if necessary.
  • FIG. 4 illustrates an embodiment of a drilling system according to the fourth aspect of the invention in a form ready for drilling.
  • the drill assembly generally indicated by the numeral 50 includes the friction bolt 22 from FIGS. 2A and 2B including drill bit 10 releasibly mounted thereon and surrounds a drill string 52 connected to the drive means 54 of a drill rig that can apply percussive and/or rotational force to the drill string 52 .
  • the friction bolt 22 has been mounted on the drill string 52 in a manner resulting in the second drill bit 40 ( FIGS. 3A-3D ) releasibly engaging with the following end of the drill bit 10 such that drive imparted on the second drill bit 40 by the drill string 52 is transferred to the drill bit 10 .
  • the following end of the friction bolt 22 includes a plate 56 , threaded on the friction bolt that enables for a more efficient engagement between the friction bolt and mesh (not shown), when the system is used to attach mesh to the formation.
  • the drilling system 50 can be used in a drilling process as follows.
  • the friction bolt 22 is inserted in a formation, such as rock, in a single pass.
  • the friction bolt 22 is inserted as the hole is being drilled simultaneously. Once drilling commences the drill bit 10 disengages from the friction bolt 22 and forms an integral cutting surface defined by the leading end of drill bit 10 and the leading end 42 of second drill bit 40 . Once the friction bolt 22 has been fully inserted, the operator stops the percussion and reverses the feed direction to disengage the drill bit 10 from the second drill bit 40 . Once disengaged, the drill string including the drill bit 40 is withdrawn from the hole through the longitudinal passage defined by the friction bolt 22 .
  • the largest outer diameter defined by the drill bit 40 is such that the drill bit 40 is adapted to pass through the longitudinal axial passage in a friction bolt 22 , once installed.
  • the drill bit 10 remains behind in the drill hole.
  • the next friction bolt 22 including drill bit 10 can then be mounted on the drill string 52 and the process repeated to install another friction bolt 22 .
  • FIGS. 5A-5C depict a drill bit according to a second embodiment of the first aspect of the present invention, generally indicated by the numeral 110 .
  • the drill bit 110 is generally ring shaped and defines a leading end (best depicted in FIG. 5B ) that defines a cutting part comprising three raised, evenly spaced buttons formed of tungsten carbide 112 a, 112 b and 112 c, a following end and a socket 114 that extends between the leading and following ends so that each end defines an aperture therein.
  • the socket 114 has a blunt reuleaux triangular shaped cross section and is adapted to receive a drive member in the form of a drive means in the form of a second drill bit 140 (discussed in further detail below).
  • the outer cross sectional shape of the drill bit 110 is generally circular and the outer surface of the drill bit 110 includes three major cut outs 116 a, 116 b 116 c and three channels 118 a, 118 b (not shown) and 118 c that are evenly spaced and extend around the outer surface between each cut out 116 a, 116 b and 116 c.
  • the channels 118 a - 118 c are adapted to releasibly engage with the inside lip of the leading end of a friction bolt 22 in a manner that allows the friction bolt 22 and drill bit 110 to form an integral unit according to an embodiment of a fifth aspect of the present invention.
  • the cut outs 116 a - 116 c are primarily to allow cuttings to be flushed away from the drilling face and escape past the face of the drill bit.
  • the second drill bit 140 is designed to be reusable and comprises a cutting section 142 at its leading end and a shank 144 at its following end that includes a threaded portion 146 (see FIGS. 6C and 6D ) to engage with a drill rod such as that shown in FIG. 3A .
  • the second drill bit 140 also includes a tapered shoulder 147 between the cutting section 142 and the shank 144 .
  • FIGS. 7A-7D illustrate the drill bits 110 and 140 together to demonstrate the nature of their inter-engagement during the drilling process.
  • a drilling system according to the fourth aspect of the invention in a form ready for drilling including the drill bits 110 and 140 operates in a similar fashion to the drill assembly generally indicated by the numeral 50 in FIG. 4 .

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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)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US15/548,553 2015-02-04 2016-02-03 Drill Bit for Use with a Friction Bolt Abandoned US20180003057A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU2015900337 2015-02-04
AU2015900337A AU2015900337A0 (en) 2015-02-04 Improved drill bit for use with a friction bolt
PCT/AU2016/050061 WO2016123668A1 (en) 2015-02-04 2016-02-03 Improved drill bit for use with a friction bolt

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AU (2) AU2016214971A1 (es)
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US10907474B2 (en) 2016-11-25 2021-02-02 China University Of Mining And Technology Reaming and self-rotating anchor rod and using method thereof
WO2021151150A1 (en) * 2020-01-29 2021-08-05 Hardrock Mining Solutions Pty Ltd Drilling assembly for inserting a rock bolt

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CN106437801B (zh) 2016-11-25 2018-04-13 中国矿业大学 一种可扩展的扩孔自锚式锚杆及支护方法

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Publication number Priority date Publication date Assignee Title
US10907474B2 (en) 2016-11-25 2021-02-02 China University Of Mining And Technology Reaming and self-rotating anchor rod and using method thereof
WO2021151150A1 (en) * 2020-01-29 2021-08-05 Hardrock Mining Solutions Pty Ltd Drilling assembly for inserting a rock bolt
US11988094B2 (en) 2020-01-29 2024-05-21 Hardrock Mining Solutions Pty Ltd Drilling assembly for inserting a rock bolt

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EA201791721A1 (ru) 2017-11-30
EP3253949A4 (en) 2018-09-26
CA2975760A1 (en) 2016-08-11
WO2016123668A1 (en) 2016-08-11
EP3253949A1 (en) 2017-12-13
AU2016214971A1 (en) 2017-08-17
AU2021202496B2 (en) 2023-04-27
AU2021202496A1 (en) 2021-05-20
CL2017001995A1 (es) 2018-03-16

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