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WO2016116848A1 - Boulon à frottement à point ancré - Google Patents

Boulon à frottement à point ancré Download PDF

Info

Publication number
WO2016116848A1
WO2016116848A1 PCT/IB2016/050234 IB2016050234W WO2016116848A1 WO 2016116848 A1 WO2016116848 A1 WO 2016116848A1 IB 2016050234 W IB2016050234 W IB 2016050234W WO 2016116848 A1 WO2016116848 A1 WO 2016116848A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
bolt
expander
rock bolt
longitudinal axis
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.)
Ceased
Application number
PCT/IB2016/050234
Other languages
English (en)
Inventor
Trent Roberts
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.)
FCI Holdings Delaware Inc
Original Assignee
FCI Holdings Delaware Inc
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 AU2015900154A external-priority patent/AU2015900154A0/en
Application filed by FCI Holdings Delaware Inc filed Critical FCI Holdings Delaware Inc
Priority to AU2016209974A priority Critical patent/AU2016209974B2/en
Publication of WO2016116848A1 publication Critical patent/WO2016116848A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • E21D21/008—Anchoring or tensioning 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
    • E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
    • F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
    • F16B13/066—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like
    • F16B13/068—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like expanded in two or more places

Definitions

  • This invention relates to rock bolts, and in particular to friction bolts.
  • Rock bolts are used in rock strata for the purpose of stabilising the strata.
  • One type of rock bolt commonly used in hard rock mines is known as a friction bolt.
  • This type of bolt comprises a tube, typically made of steel, that is split longitudinally and which is forced into a bore, drilled into rock strata which is marginally smaller than the diameter of the tube. The tube becomes compressed so that the external surface of the tube engages the internal surface of the bore, anchoring the rock bolt inside the bore by friction forces.
  • Friction bolts are relatively cheap to manufacture and are easy to use compared with some other types of rock bolts which often require resin or cement to lock them into the bore.
  • friction bolts do have a number of drawbacks.
  • One significant drawback is the tendency for friction bolts to disengage from the bore when a sufficiently large force is applied to the bolt
  • rock bolt for frictionally engaging with the internal surface of a bore drilled into rock strata
  • the bolt comprising a generally circular tube defining a longitudinal split and a longitudinal axis, the tube being radially expandable, the bolt having a first leading end for insertion into a bore and a second end defining a head; and expander means for expanding the diameter of the tube at least one location along the tube, the expander means comprising first and second expander elements arranged so that relative movement of the two elements causes the diameter of the tube to expand at that location; wherein the first expander element is mounted on an elongate element which is aligned generally along the longitudinal axis of the tube, one end of the elongate element defining a first engagement means located inside the tube proximate to the expander elements and configured to receive a drive means defining a complementary, second engagement means, the second expander element locates between the rod and the tube; the arrangement being such that rotation of the elongate element by the drive means causes
  • the second expander element is not secured to the tube.
  • a contraction is defined in the internal diameter of the tube which limits the movement of the second element towards the proximal end of the friction bolt.
  • the leading end of the bolt is tapered.
  • the elongate element may be a bar or rod which is externally threaded and defines one threaded end and at an opposite end which is preferably in the form of an head portion which is enlarged relative to the threaded part of the elongate element, which head portion defines the first engagement means, which will typically be in the form of a shaped socket for receiving a drive.
  • the socket will be hexagonal for receiving a hexagonal drive steel, although other shapes are possible and may be used in certain applications, including square.
  • a floating ring locates on and/or around the elongate element between the head and the contraction and includes a face which is configured to seat against the contraction.
  • the first expander element may be in the form of a wedge which defines an internally threaded bore and wherein rotation of the elongate element/rod draws the wedge in the direction of the head of the bolt.
  • the second expander element comprises a shell defining a plurality of leaves which are spaced from one another and the first expander element defines a projection, which projects outwardly from a longitudinal axis of the bolt and which locates in a longitudinal gap between two leaves of the shell to inhibit rotation of the first expander element relative to the second expander element, about the longitudinal axis.
  • the projection may be in the form of a fin whose longitudinal axis is parallel to the longitudinal axis if the bolt.
  • the second expander element comprises a shell defining a plurality of leaves which are spaced from one another and wherein a projection is defined on the second expander element which projects outwardly from a longitudinal axis of the bolt and which locates in the longitudinal split to inhibit rotation of the second expander element relative to the tube about the longitudinal axis.
  • the projection on the second expander element is in the form of a pair of fins whose longitudinal axes are parallel to the longitudinal axis if the bolt and which are located on adjacent leaves of the shell spaced by a distance approximately equal to the width of the split.
  • the invention also contemplates a method of installing a rock bolt according to any preceding aspect comprising: drilling a bore into a rock wall, strata or the like, inserting a leading end of the bolt/tube into the opening of the bore; engaging a first engagement means located inside the tube proximate to expander elements of the rock bolt with a drive means; driving the rock bolt into the bore using percussion; rotating the drive means to cause the expander elements to expand the tube; and disengaging the drive means and removing the drive means from inside the tube.
  • Figure 1 is a schematic view of a friction bolt embodying the present invention
  • Figure 2 is an isometric view of a wedge and expansion shell assembly of the friction bolt of Figure 1 ;
  • Figure 3 is an isometric view of an opposite end of the wedge shown in Figure 2;
  • Figure 4 is an end view of the expansion shell assembly shown in Figure 2;
  • Figure 5 is an end view of a stud drive
  • Figure 6 is an isometric view of the stud drive of Figure 5;
  • Figure 7 shows a drive steel
  • Figure 8 is a side view of the stud drive shown in Figure 5;
  • Figures 9a to 9c show views of a split ring; and
  • Figure 10 is a side view of the expansion shell assembly and stud drive, omitting the external friction bolt tube.
  • Figure 1 shows components an embodiment of a friction bolt 10.
  • the bolt 10 includes an elongate tube 12 made of steel, which is typically in the order of 2m long, but whose length can vary from 1 to 5m depending on the particular application.
  • a longitudinal axis 10a is shown extending along the centre of the tube.
  • the tube 12 is split longitudinally along its length.
  • the split 14 extends along the length of the tube.
  • the tube tapers at the leading end 12b of the bolt.
  • the tapered end 16 makes it easier to insert the tube into a pre-drilled bore.
  • FIGS. 2 to 4 show components of an expansion assembly/anchor 30, also shown in Figure 10.
  • the anchor comprises a first expander element in the form of a conical wedge element 32 and a second expander element in the form of an external shell 34.
  • the external shell comprises four leaves 36 which are generally arcuate in a cross-section transverse to the longitudinal axis of the bolt and subtend an angle of about 90°.
  • the shell could comprise only two leaves or four leaves).
  • the inner surface of the leaves 36 is smooth and part cylindrical.
  • the external surface defines a series of ridges 38 which, in use, engage with the internal walls of the tube 12.
  • the thickness of the leaves gradually increases from the end 40 of the leaves closest to the wedge element to the distal end 43.
  • gaps 42 are defined between the leaves, three of which are closed at one end and one of which 42a is not.
  • the wedge element 32 defines an external fin 44 which locates in the gap 42a between two adjacent leaves to prevent the wedge rotating relative to the shell.
  • Gap 42a is a through gap and is not closed at the distal end 43 of the shell furthest from the wedge.
  • the second expander element/shell 34 defines two fins 52 and 54 which are located at the distal end 42 of the shell, spaced apart on either side of the through gap 42a.
  • the two fins 52 and 54 locate in the split 14 in the tube 12.
  • the distance between the two fins is about the same/slightly larger than the width of the split 14 so that the fins help to centre and steady the position of the shell 32 in the tube 12, as well as preventing rotation of the shell 32 relative to the tube.
  • the wedge element 32 is generally conical and tapers towards the external shell, having a wider end 60 and a narrower end 62.
  • the wedge defines a central through hole 33 which is internally threaded (typically an M24 thread) to engage with the externally threaded part of a elongate rotatable element in the form of a stud drive 70.
  • the stud drive 70 is best seen in Figures 5 to 8. It comprises an elongate element in the form of relatively short externally threaded rod/bar, one end 72 of which is threaded with an M24 thread and the opposite end of which 74 is enlarged and defines a head 74 in which is defined a hexagonal opening/socket 76 configured for receiving a drive steel 78.
  • Figures 9a to 9c show a split ring 80 which fits onto the stud drive, in a floating fit.
  • One face of the ring 82 includes a concavely curved/shaped side portion to nest with the curved of the crimp 18.
  • the opposite face 84 is planar.
  • the rod is inserted into the tube 12 with the floating split ring 80 mounted on the rod adjacent the head 74, with the planar face 84 facing the head 74.
  • the floating ring is free to move on the rod and the curved face 82 seats into the radial crimp.
  • the expansion assembly sits on the opposite side of the crimp 18.
  • the stud drive 70 is located inside the expansion shell and is screwed onto the wedge until hand tight. Once assembled, the exposed thread that protrudes from the wedge is contoured/punched to prevent the assembly from loosening during
  • the friction bolt is inserted in a pre-drilled hole which is marginally smaller than the external diameter of the tube.
  • the drive steel 78 is mounted on a drilling rig drive and is inserted into the stud drive of the bolt when the bolt is mounted onto the drilling rig boom.
  • the stud drive may remain inactive during insertion of the bolt into the hole, which relies on percussion to hammer the bolt into the rock, provided that the drive steel 78 is not rotated.
  • the rotating wedge 32 is drawn along the rod into the expansion shell 34, and this expansion of the shell point anchors the friction bolt 10.
  • This friction bolt may be used even in poor ground and has the advantage that it is lighter and cheaper than existing designs and it does not require a solid rod which extends to the head of the friction bolt, reducing material costs and weight.
  • the length of the hexagonal socket for receiving a drive steel is typically around 75mm as this improves the alignment of the stud drive and improves installation accuracy.

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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Dowels (AREA)

Abstract

La présente invention porte sur un boulon d'ancrage (10) destiné à venir en prise par frottement avec la surface interne d'un puits foré dans une strate rocheuse. Le boulon comprend un tube ayant une section transversale circulaire (12) définissant une fente longitudinale (14) et un axe longitudinal (10a). Le tube (12) est apte à se dilater radialement. Le boulon (10) a une première extrémité avant (12b) pour insertion dans un puits, une seconde extrémité définissant une tête (12a) et des moyens de dilatation (30) destinés à dilater le diamètre du tube au moins un emplacement le long du tube. Le moyen de dilatation comprend de premier (32) et second (34) éléments de dilatation agencés de telle sorte que le déplacement relatif des deux éléments amène le diamètre du tube à se dilater au niveau de cet emplacement. Le premier élément de dilatation (32) est monté sur un élément allongé (70) qui est aligné généralement le long de l'axe longitudinal du tube. Une extrémité de l'élément allongé (70) définit un premier moyen de mise en prise (76) situé à l'intérieur du tube à proximité les éléments de dilatation qui est configuré pour recevoir un moyen d'entraînement (78) définissant un second moyen de mise en prise, complémentaire. Le second élément de dilatation (34) est positionné entre la tige et le tube. La rotation de l'élément allongé (70) par le moyen d'entraînement (78) provoque le déplacement relatif des deux éléments afin d'amener le diamètre du tube à se dilater au niveau de l'emplacement.
PCT/IB2016/050234 2015-01-20 2016-01-19 Boulon à frottement à point ancré Ceased WO2016116848A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2016209974A AU2016209974B2 (en) 2015-01-20 2016-01-19 Point anchored friction bolt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2015900154 2015-01-20
AU2015900154A AU2015900154A0 (en) 2015-01-20 Point Anchored Friction Bolt

Publications (1)

Publication Number Publication Date
WO2016116848A1 true WO2016116848A1 (fr) 2016-07-28

Family

ID=56416494

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/050234 Ceased WO2016116848A1 (fr) 2015-01-20 2016-01-19 Boulon à frottement à point ancré

Country Status (2)

Country Link
AU (1) AU2016209974B2 (fr)
WO (1) WO2016116848A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106498922A (zh) * 2016-12-08 2017-03-15 贵州中钻机械设备有限公司 一种自钻式锚固连接套
WO2019095006A1 (fr) * 2017-11-20 2019-05-23 Peter Bryce Catoi Boulon d'ancrage
CN110621848A (zh) * 2017-05-11 2019-12-27 山特维克知识产权股份有限公司 摩擦岩石锚杆

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109751067B (zh) * 2019-03-16 2020-10-23 安徽航睿电子科技有限公司 一种提高锚杆预拉拔力的方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339449A (en) * 1965-01-27 1967-09-05 Lerich Lester Anchor bolt with expansion sleeve
US3379089A (en) * 1966-04-04 1968-04-23 Chester I. Williams Limited expansion rock bolt anchor
US3908386A (en) * 1970-08-03 1975-09-30 Chester I Williams Rock bolt for remote installation
US4312604A (en) * 1980-07-17 1982-01-26 Ingersoll-Rand Co. Friction rock stabilizer set, and a method of fixing a friction rock stabilizer in an earth structure bore
US5599140A (en) * 1995-09-13 1997-02-04 The Eastern Company Mine roof support system including an expansion anchor with means assisting resin component mixing and method of installation thereof
US6357960B1 (en) * 2001-01-24 2002-03-19 The United States Of America As Represented By The Secretary Of The Army Non-protrusive expandable clamping device
CN102889278A (zh) * 2012-10-21 2013-01-23 胡国贤 一种受力膨胀螺杆
EP2527666B1 (fr) * 2011-05-24 2014-12-03 fischerwerke GmbH & Co. KG Ancre extensible

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339449A (en) * 1965-01-27 1967-09-05 Lerich Lester Anchor bolt with expansion sleeve
US3379089A (en) * 1966-04-04 1968-04-23 Chester I. Williams Limited expansion rock bolt anchor
US3908386A (en) * 1970-08-03 1975-09-30 Chester I Williams Rock bolt for remote installation
US4312604A (en) * 1980-07-17 1982-01-26 Ingersoll-Rand Co. Friction rock stabilizer set, and a method of fixing a friction rock stabilizer in an earth structure bore
US5599140A (en) * 1995-09-13 1997-02-04 The Eastern Company Mine roof support system including an expansion anchor with means assisting resin component mixing and method of installation thereof
US6357960B1 (en) * 2001-01-24 2002-03-19 The United States Of America As Represented By The Secretary Of The Army Non-protrusive expandable clamping device
EP2527666B1 (fr) * 2011-05-24 2014-12-03 fischerwerke GmbH & Co. KG Ancre extensible
CN102889278A (zh) * 2012-10-21 2013-01-23 胡国贤 一种受力膨胀螺杆

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106498922A (zh) * 2016-12-08 2017-03-15 贵州中钻机械设备有限公司 一种自钻式锚固连接套
CN110621848A (zh) * 2017-05-11 2019-12-27 山特维克知识产权股份有限公司 摩擦岩石锚杆
CN110621848B (zh) * 2017-05-11 2022-07-19 山特维克知识产权股份有限公司 摩擦岩石锚杆
WO2019095006A1 (fr) * 2017-11-20 2019-05-23 Peter Bryce Catoi Boulon d'ancrage
AU2018368811B2 (en) * 2017-11-20 2023-11-30 Aumms Pty Ltd Rock bolt

Also Published As

Publication number Publication date
AU2016209974A1 (en) 2017-08-10
AU2016209974B2 (en) 2020-05-28

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