WO2005047653A1 - Systeme de boulon modulaire - Google Patents

Systeme de boulon modulaire Download PDF

Info

Publication number
WO2005047653A1
WO2005047653A1 PCT/SE2004/001537 SE2004001537W WO2005047653A1 WO 2005047653 A1 WO2005047653 A1 WO 2005047653A1 SE 2004001537 W SE2004001537 W SE 2004001537W WO 2005047653 A1 WO2005047653 A1 WO 2005047653A1
Authority
WO
WIPO (PCT)
Prior art keywords
rock bolt
module
section
end module
rock
Prior art date
Application number
PCT/SE2004/001537
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 WO2005047653A1 publication Critical patent/WO2005047653A1/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 modular rock bolt system.
  • 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.
  • rock drill is removed from the hole and a rock bolt is subsequently inserted into the hole. If a very long rock bolt is needed, jointed rock bolts comprising several sections can be used.
  • 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.
  • 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 .
  • rock bolts as they have been manufactured up until now, is that all the different types of rock bolts are manufactured in different ways making it necessary to have a great flexibility within a production unit which is intended to manufacture all types of rock bolts.
  • This in turn requires complex and expensive manufacturing systems which can be reprogrammed for each type of rock bolt, and a complex logistic system for delivering different components for the respective types of rock bolts.
  • the operators of the manufacturing systems also need to keep track of which preparations has to be made to which components depending of the type of rock bolt to be manufactured and what components are to be attached to each end of the rock bolt. All in all, this results in high production costs .
  • drilling fluid is delivered without difficulty to the drill bit unit, and expanding fluid to the parts that are to be expanded.
  • Figure 1 shows a longitudinal section of a jointed self- drilling rock bolt comprising three rock bolt sections, together comprising nine rock bolt modules.
  • Figure 2 shows a cross-section of an intermediate rock bolt module according to one embodiment of the invention.
  • Figure 3 shows a longitudinal section of an alternative intermediate rock bolt module. Detailed description of preferred embodiments
  • the invention relates to a modular rock bolt system where a rock bolt comprises at least one rock bolt section, where each rock bolt section comprises in series a first end module and an intermediate module and a second end module joined together, and where said first end module abuts and is joined against the first axial end surface of said intermediate module thereby forming a first contact region and where said second end module abuts and is joined against the second axial end surface of said intermediate module thereby forming a second contact region, and where said first contact region and said second contact region both have cross-sections that substantially overlap each other when seen axially along said rock bolt .
  • Figure 1 shows a longitudinal section of a jointed self- drilling rock bolt 2 according to one embodiment of the invention comprising three rock bolt sections 4,6,8, preferably joined together by threads, together comprising nine rock bolt modules 10, 14, 18;20, 24, 28 ; 30, 34, 38.
  • the front section 4 comprises at least three main modules: firstly, a drill bit unit module 10; secondly, an intermediate module 14, preferably comprising an expandable part intended to be expanded after the rock bolt 2 has been fully inserted in position within a rock 42 in order to lock said rock bolt 2 mechanically to the internal radial surface 44 of a hole 46 drilled into the rock 42; and thirdly, a connector module 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 module 10 may comprise a drill bit 50 intended to be used for drilling a hole 46 into a rock 42, or a holder 52 for a drill bit 50 and a drill bit 50, respectively.
  • the rear section 8 also comprises at least three main modules: firstly, a connector module 30 intended for connecting the front end of the rear section 8 of the rock bolt 2 to a rear end of another section of said rock bolt 2; secondly, an intermediate module 34; and thirdly, a connector module 38 intended for connecting the rear end 37 of the rear section 8 of the rock bolt 2 to a drilling apparatus 60.
  • Said intermediate module 34 may comprise an expandable part of the same type as mentioned 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 60 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 6, where said intermediate section (s) also comprise at least three main modules: firstly, a connector module 20 intended for connecting the front end of the intermediate section 6 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 module 24; and thirdly, a connector module 28 intended for connecting the rear end 27 of the intermediate section 6 of the rock bolt 2 to a front end of another section (e.g. 8) of said rock bolt 2.
  • Said intermediate module may comprise an expandable part of the same type as mentioned in the front section 4 of the rock bolt 2, but it may also be a non-expandable part intended to convey expanding fluid 62, and in some embodiments also drilling fluid 64, from the drilling apparatus 60 or another fluid source to the front section 4 of the rock bolt 2.
  • the drill bit unit module 10 comprises a holder 52 for a drill bit 50 and a drill bit 50, respectively, where the front end of said intermediate module 14 of said front section 4 of the rock bolt 2 is joined to the holder 52.
  • each of the sections 4; 6; 8 in the rock bolt 2 preferably also comprise a drilling fluid supply pipe 66; 68; 70 located along the axis of rotation X of the rock bolt 2.
  • the expanding fluid 62 is preferably conveyed from a fluid source 76, via a pipe 77 and through an inlet 78 in the connector module 38 intended for connecting the rear end 37 of the rear section 8 of the rock bolt 2 to a drilling apparatus 60, through the intermediate modules 34,24,14 thereby reaching those of the intermediate modules 34,24,14 that are to be expanded after the rock bolt 2 has been fully inserted in position within a rock 42 in order to lock said rock bolt 2 mechanically to the internal radial surface 44 of a hole 46 drilled into the rock 42.
  • Joints 80,81 comprising at least one fluid passage 82 , 84 , 86; 88, 90 , 92 are arranged between said intermediate modules 34,24,14 in order for the expanding fluid 62 to be able to flow through the joints 80,81. It is possible to let the drilling fluid 64 use the intermediate modules 34,24,14 as a pipe, in the same way as the expanding fluid 62. In this case some means for closing off the fluid opening in the drill bit unit module 10 must be arranged.
  • the closing off of said opening may for example be executed using a pressure or rotation controlled vent (not shown) in the opening 74 which vent closes when the pressure in the expanding fluid 62 exceeds a threshold.
  • the expanding fluid 62 when the expanding fluid 62 is conveyed at a high pressure into the opening, said vent closes thus expanding the walls of those of the parts of the intermediate modules 34,24,14 that are to be expanded until they come into contact with the radial surface 44 inside the drill hole 46.
  • the expanding fluid 62 and the drilling fluid 64 may be the same fluid such as water fed from the same fluid source and through the same opening or two different fluids such as liquid concrete and water fed from two different fluid sources.
  • Figure 2 shows a cross-section of an intermediate module 14,24,34 in a section 4,6,8 of a rock bolt 2.
  • both the outer periphery 100 and the inner periphery 102 of said intermediate module has a symmetrical cross-section forming a cross-like shape having an inner channel 104 also with a cross-like shape as shown in figure 2.
  • the wall thickness between the inner periphery 102 and the outer periphery 100 is preferably equal throughout said cross- section. Said part thus forms a pipe-like device preferably with room for a drilling fluid supply pipe 66; 68; 70 in the centre.
  • the inner channel can always be accessed through a hole in the axis of rotation of an end module 10 , 18 ; 20 , 28 ; 30 , 38 of a section 4,6,8 in a rock bolt 2.
  • All the intermediate modules 14,24,34 may have a similar construction regarding the cross-section.
  • the intermediate module may also be expandable when using a profile as shown in figure 2.
  • Fig. 3 shows a expanding rock bolt 3 according to prior art, e.g. a "SWELLEX ® " type of rock bolt from Atlas Copco, Sweden.
  • This type of rock bolt 3 may alternatively be used as an intermediate module 14,24,34 instead of a profile as described in figure 2.
  • This prior art rock bolt 3 comprises and intermediate expandable part 5 welded (at 55 and 57) to two non-expandable end parts 7,9, where the respective non- expandable end parts 7,9 will be joined to two end modules (e.g. 10 and 18) .
  • Symmetrical cross-sections for the intermediate modules 14,24,34 of the rock bolt 2 other than the one shown in figure 2 are also possible to use preferably with room for a drilling fluid supply pipe 66,68,70 located along the axis X of rotation of the intermediate rock bolt modules 14,24,34.
  • symmetrical cross-sections are preferred, non- symmetrical cross-sections are also possible to use, preferably with room for a drilling fluid supply pipe 66,68,70 located along the axis X of rotation of the intermediate rock bolt module 14,24,34.
  • the three modules 10, 14, 18 ;20, 24, 28 ; 30, 34, 38 of a section 4,6,8 in a rock bolt 2 may be 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 modules
  • modules 10, 14, 18; 20, 24, 28; 30, 34,38 thus maximizing the stability of said section 4,6,8.
  • joining of modules 10, 1 , 18 ;20, 24, 28;30 , 34 , 38 in a section may be done in a similar way for all sections 4,6,8, thereby forming first contact regions 13,23,33 and second contact regions 19,29,39.
  • the intermediate module 14 is joined at a first end to a first end module 10 and at a second end to a second end module 18.
  • Said first end module 10 abuts against the first axial end surface of said intermediate module 14 thereby forming a first contact region 13
  • said second end module 18 abuts against the second axial end surface of said intermediate module 14 thereby forming" a second contact region 19.
  • Said intermediate module 14, said first contact region 13, and said second contact region 19 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 second end. module 18 via said intermediate module 14 into said first end.
  • Said intermediate module 14 is preferably joined to said first end module 10 and said second end module 18, 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.
  • a jointed self-drilling rock bolt has been used to exemplify the invention in the description above.
  • the invention also relates to other kinds of rock bolts, e.g. jointed rock bolts that are not self-drilling, self-drilling rock bolts that are not jointed, and rock bolts that are neither self-drilling nor jointed.
  • the rock bolts that are self drilling preferably comprise drilling fluid pipes, but this is not mandatory as has been mentioned above.
  • the rock bolts that are not self drilling do preferably not comprise any drilling fluid pipes as they are unnecessary and thus only give rise to unnecessary costs.
  • the end modules that have been used to exemplify the invention are: a drill bit unit module , comprising a drill bit, or comprising both a drill bit and a holder for a drill bit; a connector module for connecting a rock bolt section to a drilling apparatus; and different connector modules for connecting a rock bolt section to another- rock bolt section.
  • a drill bit unit module comprising a drill bit, or comprising both a drill bit and a holder for a drill bit
  • a connector module for connecting a rock bolt section to a drilling apparatus
  • different connector modules for connecting a rock bolt section to another- rock bolt section.
  • other end modules are also possible.
  • the front end module may be a cap intended only to seal off the interior of the intermediate module thus preventing leakage of expanding fluid, or a cap with external protrusions intended to prevent a rock bolt inside a drilling hole from falling out.

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)
  • Connection Of Plates (AREA)

Abstract

La présente invention concerne un système de boulon modulaire, un boulon (2) comprenant au moins une partie (4, 6, 8), chaque partie (4; 6; 8) du boulon comprenant en série un premier module d'extrémité (10; 20; 30), un module intermédiaire (14; 24; 34) et un second module d'extrémité (18; 28; 38) reliés entre eux. Selon l'invention : ledit premier module d'extrémité (10; 20; 30) vient en butée et est fixé contre la première surface d'extrémité axiale dudit module intermédiaire (14; 24; 34) pour ainsi former une première zone de contact (13; 23; 33), et ledit second module d'extrémité (18; 28; 38) vient en butée et est fixé contre la seconde surface d'extrémité axiale dudit module intermédiaire (14; 24; 34) pour ainsi former une seconde zone de contact (19; 29; 39) ; et ladite première zone de contact (13; 23; 33) et ladite seconde zone de contact (19; 29; 39) ont toutes deux des sections transversales qui se recouvrement sensiblement entre elles lorsqu'elles sont considérées de façon axiale le long dudit boulon (2).
PCT/SE2004/001537 2003-11-13 2004-10-22 Systeme de boulon modulaire WO2005047653A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0302996-4 2003-11-13
SE0302996A SE526972C2 (sv) 2003-11-13 2003-11-13 Modulärt bergbultsystem

Publications (1)

Publication Number Publication Date
WO2005047653A1 true WO2005047653A1 (fr) 2005-05-26

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Application Number Title Priority Date Filing Date
PCT/SE2004/001537 WO2005047653A1 (fr) 2003-11-13 2004-10-22 Systeme de boulon modulaire

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SE (1) SE526972C2 (fr)
WO (1) WO2005047653A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013002711A1 (fr) 2011-06-30 2013-01-03 Krekula Haakan Boulon de mine expansible
CZ306166B6 (cs) * 2015-09-16 2016-08-31 Jennmar Multitex S.R.O. Samozávrtný hydraulicky rozpínatelný horninový svorník
WO2019033133A1 (fr) * 2017-08-09 2019-02-14 Theodore Daniel Swemmer Boulon à friction extensible autoperceur

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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013002711A1 (fr) 2011-06-30 2013-01-03 Krekula Haakan Boulon de mine expansible
US9051831B2 (en) 2011-06-30 2015-06-09 Hakan Krekula Expandable mine bolt
EP2726712A4 (fr) * 2011-06-30 2016-06-08 Håkan Krekula Boulon de mine expansible
RU2592083C2 (ru) * 2011-06-30 2016-07-20 Хокан КРЕКУЛА Расширяемый анкерный болт
CZ306166B6 (cs) * 2015-09-16 2016-08-31 Jennmar Multitex S.R.O. Samozávrtný hydraulicky rozpínatelný horninový svorník
WO2019033133A1 (fr) * 2017-08-09 2019-02-14 Theodore Daniel Swemmer Boulon à friction extensible autoperceur

Also Published As

Publication number Publication date
SE0302996D0 (sv) 2003-11-13
SE526972C2 (sv) 2005-11-29
SE0302996L (sv) 2005-05-14

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