WO2005047651A1 - Boulon auto-perceur compose - Google Patents

Boulon auto-perceur compose Download PDF

Info

Publication number
WO2005047651A1
WO2005047651A1 PCT/SE2004/001535 SE2004001535W WO2005047651A1 WO 2005047651 A1 WO2005047651 A1 WO 2005047651A1 SE 2004001535 W SE2004001535 W SE 2004001535W WO 2005047651 A1 WO2005047651 A1 WO 2005047651A1
Authority
WO
WIPO (PCT)
Prior art keywords
rock bolt
drilling
section
sections
fluid
Prior art date
Application number
PCT/SE2004/001535
Other languages
English (en)
Inventor
Fredrik ÖBERG
Morgan Kanflod
Original Assignee
Atlas Copco Rock Drills 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
Application filed by Atlas Copco Rock Drills Ab filed Critical Atlas Copco Rock Drills Ab
Publication of WO2005047651A1 publication Critical patent/WO2005047651A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0046—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
    • 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
    • E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid

Definitions

  • the present invention relates to a jointed self-drilling rock bolt.
  • rock bolts for example for supporting of the rock in order to increase its stability or for anchorage of suspension hooks or the like to the rock, are used for different types of rock. If the rock is solid, then a hole is usually drilled into the rock using a rock drill. Thereafter, the rock drill is removed from the hole and a rock bolt is subsequently inserted into the hole. If, on the other hand, the rock is non-solid, i.e. it comprises a multitude of cracks and the like, the hole will not remain fully open when the rock drill is removed thereby making it impossible to insert a rock bolt into the hole due to blocking rock material .
  • a rock bolt of the self-drilling type is used, i.e. a rock bolt comprising a drill bit mounted thereon which drill bit is left in the rock together with the rock bolt, whereby the hole will remain free from blocking rock material due to the fact that no removal of the drill bit takes place.
  • a self-drilling rock bolt is shown in the Japanese patent application No. 2000-373505, which rock bolt comprises, in series, a rod for connecting the self-drilling rock bolt to a drilling apparatus, an expandable bolt part, and a drill bit unit comprising a holder for a drill bit and a drill bit, respectively.
  • a drilling water supply pipe with a first end opening in the centre of rotation of the connector rod and a second opening on the surface of the drill bit extends from the connector rod, through the inside the expandable part and to the drill bit unit.
  • a drawback with a rock bolt of the type mentioned above is that long rock bolts can not be installed in one piece in mines with low roofs or in narrow tunnels if the length of the rock bolt exceeds the height of the mine or the width of the tunnel.
  • the rock can be of such low quality that the rock bolts needed to sufficiently strengthen the rock are so long that the drilling rig is unable to handle the rock bolts in one piece.
  • drilling fluid is delivered without difficulty to the drill bit unit, and axial forces during a hammer drilling operation can propagate in an essentially axial direction through said sections thus improving the axial stability of the rock bolt as the rock bolt is able to withstand large axial forces without collapsing.
  • Figure 1 shows a longitudinal section of a jointed self- drilling rock bolt according to one embodiment of the invention.
  • Figure 2 shows a longitudinal section of a joint in a jointed self-drilling rock bolt.
  • Figure 3 shows a cross-section of a jointed self-drilling rock bolt along line III-III in figure 1.
  • Figure 1 shows a longitudinal section of a jointed self- drilling rock bolt 2 according to one embodiment of the invention.
  • the self-drilling rock bolt 2 comprises at least two sections, a front section 4 and a rear section 6, preferably joined together by threads or otherwise connected together, where at least one section comprises an expandable part.
  • said front section 4 comprises at least three main parts: firstly, a drill bit unit 8; secondly, an intermediate expandable part 10 intended to be expanded after the rock bolt 2 has been fully inserted in position within a rock 12 in order to lock said rock bolt 2 mechanically to the internal radial surface 14 of a hole 16 drilled into the rock 12; and thirdly, a connector part 18 intended for connecting the rear end 17 of the front section 4 of the rock bolt 2 to a front end of another section of said rock bolt 2.
  • the drill bit unit 8 may comprise a drill bit 20 intended to be used for drilling a hole 16 into a rock 12, or a holder 22 for a drill bit 20 and a drill bit 20, respectively.
  • Said rear section 6 also comprises at least three main parts: firstly, a connector part 24 intended for connecting the front end 25 of the rear section 6 of the rock bolt 2 to a rear end of another section of said rock bolt 2; secondly, an intermediate part 26; and thirdly, a connector part 28 intended for connecting the rear end 27 of the rear section 6 of the rock bolt 2 to a drilling apparatus 30.
  • Said intermediate part 26 may be an expandable part of the same type as in the front section 4 of the rock bolt 2, but it may also be a non-expandable part intended to convey drilling fluid, percussion force, rotation and expanding fluid, respectively, from the drilling apparatus 30 or another fluid source to the front section 4 of the rock bolt 2.
  • the self-drilling rock bolt 2 may further comprise one or more intermediate sections 32, where said intermediate section (s) also comprise at least three main parts: firstly, a connector part 34 intended for connecting the front end 35 of the intermediate section 32 of the rock bolt 2 to a rear end (e.g. 17)of another section (e.g. 4) of said rock bolt 2; secondly, an intermediate part 36; and thirdly, a connector part 38 intended for connecting the rear end 37 of the intermediate section 32 of the rock bolt 2 to a front end (e.g. 25) of another section (e.g. 6) of said rock bolt 2.
  • intermediate section (s) also comprise at least three main parts: firstly, a connector part 34 intended for connecting the front end 35 of the intermediate section 32 of the rock bolt 2 to a rear end (e.g. 17)of another section (e.g. 4) of said rock bolt 2; secondly, an intermediate part 36; and thirdly, a connector part 38 intended for connecting the rear end 37 of the intermediate section 32 of the rock bolt 2 to a
  • Said intermediate part 36 may be an expandable part of the same type as in the front section 4 of the rock bolt 2, but it may also be a non-expandable part intended to convey expanding fluid 40, and in some embodiments also drilling fluid 42, from the drilling apparatus 30 or another fluid source to the front section 4 of the rock bolt 2.
  • the drill bit unit 8 comprises a holder 22 for a drill bit 20 and a drill bit 20, respectively, where the front end 11 of said intermediate expandable part 10 of said front section 4 of the rock bolt 2 is joined to the holder 22.
  • each of the sections 4; 6; 32 in the rock bolt 2 preferably also comprise a fourth part consisting of a drilling fluid supply pipe 44,-46,-48 located along the axis of rotation X of the rock bolt 2.
  • the expanding fluid 40 is preferably conveyed from a fluid source 56, via a pipe 55 and through an inlet 54 in the connector part 28 intended for connecting the rear end 27 of the rear section 6 of the rock bolt 2 to a drilling apparatus 30, through the intermediate parts 26,36,10 thereby reaching those of the intermediate parts 26,36,10 that are to be expanded after the rock bolt 2 has been fully inserted in position within a rock 12 in order to lock said rock bolt 2 mechanically to the internal radial surface 14 of a hole 16 drilled into the rock 12.
  • Joints 58,60 comprising at least one fluid passage 62 , 64 , 66 ; 68 , 70 , 72 are arranged between said intermediate parts 26,36,10 in order for the expanding fluid 40 to be able to flow through the joints 58,60.
  • Figure 2 shows a longitudinal section of a joint 59 in a jointed self-drilling rock bolt 2.
  • FIG. 1 thus shows a longitudinal section of a joint 59 in a jointed self-drilling rock bolt 2, where a front section 4 and a rear section 6 of the rock bolt 2 are joined together.
  • the front section 4 has an intermediate part 10, which may or may not be expandable, intended for conveying expanding fluid 40, and also a connector part 18 intended for connecting the rear end 17 of the front section 4 to a front end of another section, in this embodiment the front end 25 of the rear section 6.
  • the rear section 6 has an intermediate part 26, which may or may not be expandable, intended for conveying expanding fluid 40, and also a connector part 24 intended for connecting the front end 25 of the rear section 6 to a rear end of another section, in this embodiment the rear end 17 of the front section 4.
  • the two connector parts 18,24 mentioned above are preferably threaded together.
  • each of the sections 4 ; 6 preferably also comprise a drilling fluid supply pipe 44; 6 located along the axis of rotation X of the rock bolt 2, in order to separate the drilling fluid 42 from the expanding fluid 40.
  • the expanding fluid 40 is conveyed from the interior of the intermediate part 26 in the rear section 6, through at least one fluid passage 62,63,70,72 arranged within the joint 59, and to the interior of the intermediate part 10 in the front section 4.
  • the fluid passage preferably comprises a first part 62 in the form of at least one hole 62 in the connector part
  • the closing off of said opening may for example be executed using a pressure or rotation controlled vent (not shown) in the opening 52 which vent closes when the pressure in the expanding fluid 40 exceeds a threshold.
  • 42 may be the same fluid such as water fed from the same fluid source and through the same opening 50,54, or two different fluids such as liquid concrete and water fed from two different fluid sources.
  • the problem of improving the axial stability of the rock bolt 2 is solved according to the invention by arranging a jointed self-drilling rock bolt 2 where the three main parts 8, 10, 18;24,26,28;34,36,38 in a section 4,6,32 of the rock bolt 2 are aligned and joined together in a way that allows the axial forces F during a hammer drilling operation to propagate in an essentially axial direction A through said three main parts 8, 10, 18;24, 26, 28;34, 36, 38, thus maximizing the stability of said sections 4,6,32, and where the joints 58,59,60 between the sections 4,6,32 are arranged to be stronger than said sections 4,6,32 in the axial direction A.
  • the intermediate expandable part 10 is joined at a first end to a connector part 18 and at a second end to a holder 22 for a drill bit 20.
  • Said connector part 18 abuts against the first axial end surface 9 of said expandable part 10 thereby forming a first contact region 5
  • said holder 22 for the drill bit 20 abuts against the second axial end surface 11 of said expandable part 10 thereby forming a second contact region 15.
  • Said expandable part 10, said first contact region 5, and said second contact region 15 all have cross-sections that at least partly overlap each other when seen axially along said rock bolt 2, thereby allowing axial forces during a hammer drilling operation to propagate in an essentially axial direction from said connector part 18 via said expandable part 10 into said holder 22 for the drill bit 20, thus improving the axial stability of the rock bolt 2.
  • Said expandable part 10 is preferably joined to said connector part 18 and said holder 22 for said drill bit 20, respectively, by welding but it is also possible to use another joining method, e.g. soldering or an adhesive if the resulting joint becomes sufficiently strong. Welding methods that may be used comprises, but are not limited to, resistance welding, friction welding and electron beam welding.
  • Figure 3 shows a cross-section of the self-drilling rock bolt 2 along line III-III in figure 1.
  • Both the outer periphery 25 and the inner periphery 27 of one of the intermediate parts 26 of said rock bolt 2 has a symmetrical cross-section forming a cross-like shape having an inner channel 45 also with a crosslike shape as shown in figure 3.
  • the wall thickness between the inner periphery 27 and the outer periphery 25 is preferably equal throughout said cross-section.
  • Said expandable part thus forms a pipe-like device preferably with room for a drilling fluid supply pipe 46 in the centre. All the intermediate parts 26,36,10 have a similar construction regarding the cross-section.
  • Symmetrical cross-sections for the intermediate parts 26,36,10 of the rock bolt 2 other than the one shown in figure 3 are also possible to use preferably with room for a drilling fluid supply pipe 46,48,44 located along the axis X of rotation of the intermediate rock bolt part 26,36,10.
  • symmetrical cross-sections are preferred, non-symmetrical cross-sections are also possible to use, preferably with room for a drilling fluid supply pipe 46,48,44 located along the axis X of rotation of the intermediate rock bolt part 26,36,10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un boulon auto-perceur composé (2) comportant au moins deux sections (4, 6, 32) jointes l'une à l'autre, au moins une des sections (4, 6, 32) comprenant une partie extensible (10, 26, 36). Les sections (4, 6, 32) sont fixées par vissage et du fluide d'extension (40) destiné à l'extension de la partie extensible (10, 26, 36) est guidé au travers d'au moins un passage fluidique (62, 63, 70, 72) présent dans un raccord (58, 59, 60) entre les deux sections (4, 6, 32), indépendamment de l'angle relatif de rotation entre les sections respectives (4, 6, 32).
PCT/SE2004/001535 2003-11-13 2004-10-22 Boulon auto-perceur compose WO2005047651A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0302995A SE526971C2 (sv) 2003-11-13 2003-11-13 Skarvbar självborrande bergbult
SE0302995-6 2003-11-13

Publications (1)

Publication Number Publication Date
WO2005047651A1 true WO2005047651A1 (fr) 2005-05-26

Family

ID=29707905

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2004/001535 WO2005047651A1 (fr) 2003-11-13 2004-10-22 Boulon auto-perceur compose

Country Status (2)

Country Link
SE (1) SE526971C2 (fr)
WO (1) WO2005047651A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7377724B2 (en) * 2003-11-13 2008-05-27 Atlas Copco Rock Drills Ab Method and device for installing a self-drilling expandable rock bolt and a self-drilling rock bolt

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT394248B (de) * 1986-01-13 1992-02-25 Magyar Aluminium Rohrkonstruktion zur herstellung eines gesteinsankers und/oder zur fluessigkeitsfoerderung
WO2003062599A1 (fr) * 2002-01-22 2003-07-31 Techmo Entwicklungs- Und Vertriebs Gmbh Boulons d'ancrage a elements expansibles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT394248B (de) * 1986-01-13 1992-02-25 Magyar Aluminium Rohrkonstruktion zur herstellung eines gesteinsankers und/oder zur fluessigkeitsfoerderung
WO2003062599A1 (fr) * 2002-01-22 2003-07-31 Techmo Entwicklungs- Und Vertriebs Gmbh Boulons d'ancrage a elements expansibles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7377724B2 (en) * 2003-11-13 2008-05-27 Atlas Copco Rock Drills Ab Method and device for installing a self-drilling expandable rock bolt and a self-drilling rock bolt

Also Published As

Publication number Publication date
SE0302995D0 (sv) 2003-11-13
SE0302995L (sv) 2005-05-14
SE526971C2 (sv) 2005-11-29

Similar Documents

Publication Publication Date Title
US20070269274A1 (en) Rock Bolt
US6309159B1 (en) Self drilling roof bolt
CN101109276A (zh) 岩石锚杆
US5387060A (en) Tubular mining bolt
JP2006219933A (ja) ロックボルト及びこれを用いた支保工法
US7624822B2 (en) Thread joint
US6808210B1 (en) Drill pipe with upset ends having constant wall thickness and method for making same
WO2005047652A1 (fr) Boulon auto-perceur
US7699123B2 (en) Bore hole sleeve reaming apparatus and method
AU705448B2 (en) Drilling method and casing shoe
WO2005047651A1 (fr) Boulon auto-perceur compose
US6644887B2 (en) Device for connecting a towed pipe to a towing apparatus
EP2726712B1 (fr) Boulon de mine expansible
WO2005047653A1 (fr) Systeme de boulon modulaire
JP2008150773A (ja) 掘削用ビット及び掘削システム
JP4429875B2 (ja) 既設管の入れ替え工法
US10407996B2 (en) One piece forged fluidic displacement drill pipe and method of manufacture thereof
WO2000052304A1 (fr) Boulon frottant avec corps flexible
KR200316682Y1 (ko) 록볼트용 몰탈캡
JP4426949B2 (ja) 既設管の入れ替え工法
US20100000797A1 (en) Drilling tool
AU765901B2 (en) Device for connecting a towed pipe to a towing apparatus
AU2003248049B2 (en) Hollow Rock Bolt and Installing Method
AU755716B2 (en) Rock bolt with keying deformations
CN111810207A (zh) 一种钻锚一体化锚固装置和方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase