US3861155A - Pumpable rockbolt method - Google Patents

Pumpable rockbolt method Download PDF

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Publication number
US3861155A
US3861155A US312393A US31239372A US3861155A US 3861155 A US3861155 A US 3861155A US 312393 A US312393 A US 312393A US 31239372 A US31239372 A US 31239372A US 3861155 A US3861155 A US 3861155A
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United States
Prior art keywords
hole
mixture
roof
roving
extending out
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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.)
Expired - Lifetime
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US312393A
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English (en)
Inventor
Meyer Steinberg
Bernard Manowitz
Charles H Waide
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US Atomic Energy Commission (AEC)
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US Atomic Energy Commission (AEC)
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Filing date
Publication date
Application filed by US Atomic Energy Commission (AEC) filed Critical US Atomic Energy Commission (AEC)
Priority to US312393A priority Critical patent/US3861155A/en
Priority to CA185,786A priority patent/CA987116A/en
Priority to ZA738843A priority patent/ZA738843B/xx
Priority to GB53962/73A priority patent/GB1449195A/en
Priority to AU62905/73A priority patent/AU480952B2/en
Priority to FR7342891A priority patent/FR2211588B1/fr
Priority to JP48138502A priority patent/JPS4988306A/ja
Priority to DE2360636A priority patent/DE2360636A1/de
Priority to US05/509,998 priority patent/US3930639A/en
Application granted granted Critical
Publication of US3861155A publication Critical patent/US3861155A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting
    • E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole

Definitions

  • ABSTRACT Method and apparatus for producing rockbolts in the roof of a subterranean cavity in whwch two components of an ambient temperature curable resin system 3 Claims, 1 Drawing Figure 29 WETTlNG OUT SUPPLY PISTON ROD PUMPABLE ROCKBOLT METHOD BACKGROUND OF THE INVENTION
  • the invention described herein was made in the course of, or under a contract with the US. Atomic Energy Commission.
  • Rockbolts have long been employed to strengthen or stabilize coal or other mine roof structures by tying together laminated or fissured rock strata.
  • a rockbolt typically would consist of a steel rod of sufficient length to extend from the roof-line up into a region of relatively strong rock, perhaps 3 to feet into the roof.
  • An expansion wedge anchor at the upper end of the bolt is secured in the surrounding rock by rotating the bolt at the roof-line using a torque wrench to set the anchor and tension the bolt.
  • a steel plate washer between the bolt head and the rock roof may be employed to spread the load to the rock.
  • resin anchors In order to improve the contact between the bolts and the rock in the roof of the mine, resin anchors have been employed which in a typical arrangement involves the insertion of resin packages into the holes which are then broken by insertion of the bolts and mixed by rotation of the bolts providing a rapid setting polymer anchor for the bolt. Fully-grouted bolts also have been used and such bolts consist of deformed bars, with or without a head, which would then be cemented into a hole using concrete or polymeric materials as grouting materials.
  • a method of reinforcing the roof of a subterranean cavity comprising the drilling of spaced holes upwardly into the roof, injecting and filling each of the holes with a polymerizable mixture, some of the mixture extending out of the hole being filled and after a period of time sufficient to permit the mixture to harden in situ removing a plug of the hardened portion of the mixture extending out of the hole, and subsequently inserting the hardened portion into the next hole to be filled as a precursor for the mixture inserted into that hole.
  • apparatus for producing a pumpable rockbolt in a bore hole upwardly extending into the roof of a mine in which there are provided first and second supply sources of the two components of an ambient temperature curable polymerizable resin system, a mixing device for receiving the first and second components for forming an intimate mixture thereof, a bolting head assembly for receiving the mixture from the mixing means having an extended exit conduitfor communicating directly with the inlet of the bore hole for delivering the mixture into the hole, the bolting head assembly having a gasket surrounding the exit conduit for providing a resilient substantially leak proof seal between the exit conduit and the rock face surrounding the hole, said gasket being of material substantially not adhered to by said resin system when the latter is cured in contact therewith, and means for purging the mixture from the bolting head assembly.
  • This arrangement results in an efficient, effective and economical means of delivering the polymerizable bolt materials to the bolt holes.
  • An additional advantage of this apparatus is that it permits the use of flexible roving material and metal tubing incorporated into the apparatus for reinforcing the polymer in the holes and also to provide venting during filling of the holes.
  • Another feature of this invention with respect to the method involved is the use of high viscosity materials to prevent the spreading or the distribution of the mixture throughout the cracks surrounding the holes into which the mixture is inserted.
  • the mixture in accordance with the principles of this invention is inserted at barely sufficient pressure to flow the mixture into the holes. This avoids the use of high pressures which would tend to force the fluid into cracks and fissures and cause further damage to the structure of the roof which in some circumstances should be avoided.
  • FIGURE illustrates in partialschematic form a preferred embodiment of this invention.
  • Apparatus 10 consists of a slide valve assembly 16, a bolting head assembly 18, a feed pipe 22 for roving and other materials as will be described further below, a supply 24 of promoted resin, a supply 26 of catalyzed resin, a waste sump 27, a supply 28 of purge resin, and a supply 29 of wetting fluid.
  • Slide valve assembly 16 consists of a cylinder 32 containing a slidable piston 34 operated by a piston rod 36.
  • Piston 34 is provided with a passageway 38 which at one end is axially located and at the other end opens to the side wall of cylinder 32.
  • the axial opening is designated 42 and the side opening is designated as 44.
  • Cylinder 32 is provided with an outlet opening 45 and conduits 46, 48 and 49, which are connected, respectively, to the promoted resin supply 24, waste sump 27, and catalyzed resin supply 26, and a conduit 52.
  • piston 34 determines whether or not side opening 44 either communicates with sump 27 (as illustrated) or resin supplies 24 and 26 are open to outlet opening 45, the latter situation occurring when piston 34 is retracted downwardly, blocking off conduit 48.
  • the upper end of cylinder 32 communicates to and is connected by opening 45 into conduit 52 to bolting head assembly 18 for reasons to be described further below.
  • conduit 52 is provided a helical static mixer 54 which provides for thorough mixing of the two components of the resin system as it flows upwardly to bolting head assembly 18.
  • Pumps P and P are provided which deliver, when actuated, the resins from supplies 24 and 26, respectively, as will be described further below. Pumps P, and P may if desired be part of a proportioning arrangement for delivering the resins from supplies 24 and 26 in any desired proportion.
  • Bolting head assembly 18 consists of a solid body 56 having an exit cylindrical extension 58 with a central countersunk well 62 which has a coating 63 of a suitable material, such as Teflon, to which the resins when polymerized will not adhere.
  • Side access to well 62 is provided by a passageway 64 in which there is a slidable piston assembly 66 consisting of a pair of pistons 68 and 72 connected by a shaft 74. Assembly 66 is controlled slidably by a piston rod 76 extending out the side of bolting head assembly 18.
  • Communication to passageway 64 is obtained by a pair of passageways 78 and 82 spaced as illustrated which are communicated to by a conduit 84 and the previously identified conduit 52, respectively.
  • Conduit 84 is connected to purge resin supply 28 through a pump P Extension 58 is provided with a gasket or covering element 86 with an opening 87 aligned with well 62.
  • Element 86 is made from a resilient material to reduce the effect of any impact and provide sealing between assembly 18 and roof 14 and to which the resins upon polymerization will not adhere.
  • a suitable material is Teflon.
  • piston rod 76 may be manipulated to uncover either only passageway 82 for supplying mixture to well 62 and into hole 12 or, in the position illustrated uncovering passageways 78 and 82 for purging remaining mixture in bolting head assembly 18 by permitting the purging fluid to enter into bolting head assembly 18 and purge out through passageway 82 all of the mixture remaining within passageway 64.
  • Roving 92 and a hollow vent tube 93 pass through wetting box 90 into feedpipe 22 and passageway 88 and then into well 62 and hole 12 terminating in a plug 94.
  • a pair of rollers 96 and 98 suitably actuated push vent tube 93 into hole 12 as illustrated, dragging or pulling roving 92 therewith.
  • Roving 92 preferably consists of continuous filament glass or similar long fibers or strands of strong nonflammable material which would be supplied from rolls not shown.
  • Tube 93 is sufficiently flexible to come from a roll and sufficiently rigid to push into hole 12 in the manner shown. Aluminum tubing for this purpose has been found to be adequate to accomplish this.
  • plug 94 consists of a polymerized section which extended into well 62 from a previous roof hole and which was cut or sawed off at the roof line, forming a precursor for the monomer, roving, and tubing being supplied to the illustrated hole 12.
  • Tube 93 being hollow, functions also as a means of venting entrapped air or gases in hole 12 as the latter is being filled from the roof line.
  • the monomer selected for use in accordance with this invention should be capable of being polymerized by the catalyst and promoter under ambient conditions as there is no provision for the application of heat to initiate the process.
  • ambient temperature is about F.
  • the polymerizable composition which has a flash point of at least 100 F for reasons of safety.
  • the polymerizable composition must contain sufficient filler material to increase the viscosity to the point where it will not flow transversely out of hole 12 into and along crevices, cracks, faults, and the like.
  • a minimum viscosity for this purpose is 1,000 centipoise, and a preferred range is 1,000-50,000 centipoise.
  • Other preferred characteristics of the composition employed include that it will expand during setting in order to provide adequate bonding with the bordering rock strata, and setting time, as least to the point where assembly 18 can be removed, should be fairly rapid, such as within about 10 minutes. Some or all of these characteristics can be obtained by the use of additives.
  • the wetting mixture whose purpose is to insure thorough impregnation of the roving, can consist of the same monomer without the presence of additives other than catalyst, while the purging fluid can be any liquid which will dissolve and wash away the monomer.
  • roof 14 is first prepared by having one or more holes 12 drilled therein of sufficient length to accomplish the purposes of the roof bolts prepared by this invention. A typical depth would be about six feet. Then bolting head assembly 18 is moved up into contact with the surface of roof 14 so that the opening in gasket 86 is aligned with entry into hole 12. As will be seen from the drawing, the portion of roving 92 left over from a previous hole which had been impregnated terminates in a solid cap 94 which was saturated with the mixture and hardened and cut off from the piece extending out of the previous hole. As already noted, plug 94 comes from within well 62 where the polymer does not adhere to the walls thereof because of coating 63.
  • rollers 96 and 98 may then be actuated to push tube 93 with plug 94 into hole 12, pulling roving 92, while simultaneously piston 34 in slide valve assembly 32 is lowered to a sufficient point where both the catalyzed resin supply 26 and the promoted resin supply 24 are exposed by the upper edge of piston 34 to conduit 52.
  • Pumps P, and P are actuated to pump these fluids into this conduit where they are mixed by mixer 54 and pass up into assembly 18.
  • piston rod 76 is manipulated so as to expose passageway 82 to well 62 (blocking passageway 78) so that the mixture coming from conduit 52 enters into well 62 and passes up through gasket 86 into hole 12.
  • Pump P is activated to maintain wetting box full of the wetting fluid. Pumping of the mixture continues until plug 94 reaches the desired height, as measured by the amount of tubing or roving used, or until hole 12 is filled, as indicated by cessation of flow.
  • the resins are supplied at only sufficient pressure to overcome the static head in hole 12 in order to avoid the distribution of the fluid into crevices and cracks which might at high pressure result in further damage to the mine roof 14.
  • Pumps P and P supply the resins in predetermined proportions, typically equal amounts of each. Wetting fluid supplied to box 90 insures that the roving will not trap any air and will be saturated with composition supplied to well 62.
  • pumps P P and P are deenergized, and piston rods 36 and 76 are moved to their purging positions as illustrated in the FIGURE. Pump P is energized to clear the lines of any mixture which can polymerize.
  • assembly 18 is held in place until the mixture extending into hole 12 jells enough not to flow out when assembly 18 is removed.
  • assembly 18 is lowered a short distance (some roving 92 and some length of vent tube 93 are pulled through when this occurs) the plug extending out of hole 12 is cut by a suitable cutting tool.
  • the plug extending out of well 62 attached to the roving and tubing then becomes the precursor for the next hole.
  • the viscosities of the resins which are utilized in this invention are sufficiently high at the temperature of use, i.e., in the range of 1,000 to 50,000 centipoise, to enhance the nonpenetration characteristics of the fluid into the cracks and crevices surrounding hole 12.
  • the temperature of use i.e., in the range of 1,000 to 50,000 centipoise
  • roving 92 with venting tube 93 are described and illustrated in connection with this invention that if the conditions of the mine roof 14 warrant it, it may be desirable and possible to employ the resins alone or with only roving 92 or only tubing 93.
  • the mixture may contain a variety of materials, such as certain fillers and additives to decrease shrinkage during curing, decrease the exotherm which occurs during curing, adjust the viscosity of the resin, improve the modulus of elasticity of the polymerized product, improve the bonding of the resin to the rock surfaces, reduce the flammability, and reduce the cost.
  • the tiller materials used and found to be useful for some of these purposes are clay, fumed silica, milled glass fiber, asbestos, and ground shale.
  • Other fillers are available and, of course, could be used.
  • glass fiber When glass fiber is employed for roving 92 it may be treated with materials on the surface making it compatible with polyester resins as is understood in the art. These surface treatments make the bond between the glass and the polyester stronger.
  • a bonding agent which serves this purpose and can be added to the resin phase is gamma-methacryloxypropyltrimethoxy silane.
  • the continuous filament glass roving 92 described herein has been found to provide excellent reinforcement for the pumpable bolt described.
  • Roving 92 is pumped or driven from a spool into the drilled hole with the polyester resins. This material provides a'significant increase inthe strength of the bolt over bolts cast from short fiber reinforced polyester resins, and further, the tensile and modulus of elasticity values of a pumpable bolt can be varied over a wide range depending on the type and quantity of reinforcement used.
  • piston rods 36 and 76 may be accomplished manually and actuation of the motors driving the pumps and rollers 96 and 98 may also be initiated by hand.
  • automatic actuating devices as known in the art may be employed if desired.
  • the apparatus may be assembled in such a way that assemblies 16 and 18 and wetting box are movable together while the remaining elements of the system, connected by flexible hose for conduits 84, 49, 46 and 48 can be located on a platform such as a trailer. On the other hand, all of the elements of the apparatus could be assembled and moved together.
  • An important advantage of this invention is that the apparatus can if desired be remotely operated thereby reducing the exposure of the persons involved to any hazards which may exist. It should also be noted that plug 94 is a precursor would not be required if roving 92 or vent tube 93 were not employed.
  • a method of reinforcing the roof of a subterranean cavity having an upwardly extending hole therein comprising the steps of mixing first and second components of a polymerizable mixture, injecting the mixture containing continuous filaments of nonflamable material into said hole, some of said mixture and material extending out of the hole, and after a period of time sufficient to permit said mixture to harden in situ, removing the hardened portion of said mixture and material extending out of said hole and subsequently inserting said hardened portion into the next hole to be filled as a precursor for mixture inserted into a next hole.

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  • 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)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Rock Bolts (AREA)
  • Joining Of Building Structures In Genera (AREA)
US312393A 1972-12-05 1972-12-05 Pumpable rockbolt method Expired - Lifetime US3861155A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US312393A US3861155A (en) 1972-12-05 1972-12-05 Pumpable rockbolt method
CA185,786A CA987116A (en) 1972-12-05 1973-11-14 Pumpable rockbolt method
ZA738843A ZA738843B (en) 1972-12-05 1973-11-20 Pumpable rockbolt method
GB53962/73A GB1449195A (en) 1972-12-05 1973-11-21 Method and apparatus for producing rockbolts in the roof of a subterranean cavity
AU62905/73A AU480952B2 (en) 1973-11-27 Pumpable rockbolt method
FR7342891A FR2211588B1 (de) 1972-12-05 1973-11-30
JP48138502A JPS4988306A (de) 1972-12-05 1973-12-05
DE2360636A DE2360636A1 (de) 1972-12-05 1973-12-05 Verfahren und vorrichtung zum einbringen eines pumpbaren gesteinsbolzens
US05/509,998 US3930639A (en) 1972-12-05 1974-09-27 Pumpable rockbolt method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US312393A US3861155A (en) 1972-12-05 1972-12-05 Pumpable rockbolt method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/509,998 Division US3930639A (en) 1972-12-05 1974-09-27 Pumpable rockbolt method

Publications (1)

Publication Number Publication Date
US3861155A true US3861155A (en) 1975-01-21

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US312393A Expired - Lifetime US3861155A (en) 1972-12-05 1972-12-05 Pumpable rockbolt method

Country Status (7)

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US (1) US3861155A (de)
JP (1) JPS4988306A (de)
CA (1) CA987116A (de)
DE (1) DE2360636A1 (de)
FR (1) FR2211588B1 (de)
GB (1) GB1449195A (de)
ZA (1) ZA738843B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079592A (en) * 1977-03-04 1978-03-21 The United States Of America As Represented By The Secretary Of The Interior Method of and apparatus for feeding and inserting bolts in a mine roof
US4158519A (en) * 1976-08-06 1979-06-19 Imperial Chemical Industries Limited Rock reinforcement
US4185940A (en) * 1977-11-08 1980-01-29 Klaus Spies Method and system for supporting a roof
US4247224A (en) * 1978-12-14 1981-01-27 Ppg Industries, Inc. Method for installing a mine roof bolt
US4307979A (en) * 1978-12-14 1981-12-29 Ppg Industries, Inc. Mine roof bolt and end cap
US4382720A (en) * 1980-01-30 1983-05-10 Wilfried Scheiber Injection liner for a borehole closure
US4443132A (en) * 1978-06-22 1984-04-17 Bayer Aktiengesellschaft Anchoring of tension members
US4744699A (en) * 1986-05-19 1988-05-17 Baker International Corporation Single-pass roof bolt and apparatus and method for installation
US4993876A (en) * 1986-06-16 1991-02-19 501 Sandoz, Ltd. Method and apparatus for protective encapsulation of structural members
US20060278414A1 (en) * 2003-05-12 2006-12-14 Fredrik Oberg Device for rock bolting and for automized rock bolting and rock bolting
US7178974B1 (en) 2004-08-06 2007-02-20 Bell Marcus O Plural component polymer grout plant
WO2018231118A1 (en) * 2017-06-14 2018-12-20 Epiroc Rock Drills Aktiebolag Arrangement and method for rock reinforcement
EP3663508A1 (de) * 2018-12-04 2020-06-10 Sandvik Mining and Construction Oy Vorrichtung zur zuführung von rohrelementen, gesteinsbohrgestell und verfahren zur unterstützung von bohrlochöffnungen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE417742B (sv) * 1979-02-22 1981-04-06 Linden Alimak Ab Anordning vid bultborrningsaggregat
DE3146587C2 (de) * 1981-11-25 1984-11-08 Bergwerksverband Gmbh, 4300 Essen Gebirksanker
DE3401089A1 (de) * 1984-01-13 1985-07-18 Hilti Ag, Schaan Setzverfahren fuer befestigungselemente

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930199A (en) * 1955-03-24 1960-03-29 Jarund Harry Sigurd Valdemar Method of anchoring bolts
US3108442A (en) * 1959-09-30 1963-10-29 Dayton T Brown Inc Stabilizing mine roofs
US3287920A (en) * 1961-12-20 1966-11-29 Jr Richard H Oitto Device for securing a plug in an infusion hole
US3332244A (en) * 1964-10-28 1967-07-25 American Cyanamid Co Reinforcing bolts
US3436923A (en) * 1966-07-07 1969-04-08 Atlas Copco Ab Method and equipment for making tension anchors
US3491497A (en) * 1966-01-24 1970-01-27 Karlheinz Bauer Earth anchor and method of forming same
US3716386A (en) * 1969-11-12 1973-02-13 Nat Res Dev Process for dispersing fibre in an aqueous mix

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930199A (en) * 1955-03-24 1960-03-29 Jarund Harry Sigurd Valdemar Method of anchoring bolts
US3108442A (en) * 1959-09-30 1963-10-29 Dayton T Brown Inc Stabilizing mine roofs
US3287920A (en) * 1961-12-20 1966-11-29 Jr Richard H Oitto Device for securing a plug in an infusion hole
US3332244A (en) * 1964-10-28 1967-07-25 American Cyanamid Co Reinforcing bolts
US3491497A (en) * 1966-01-24 1970-01-27 Karlheinz Bauer Earth anchor and method of forming same
US3436923A (en) * 1966-07-07 1969-04-08 Atlas Copco Ab Method and equipment for making tension anchors
US3716386A (en) * 1969-11-12 1973-02-13 Nat Res Dev Process for dispersing fibre in an aqueous mix

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158519A (en) * 1976-08-06 1979-06-19 Imperial Chemical Industries Limited Rock reinforcement
US4079592A (en) * 1977-03-04 1978-03-21 The United States Of America As Represented By The Secretary Of The Interior Method of and apparatus for feeding and inserting bolts in a mine roof
US4185940A (en) * 1977-11-08 1980-01-29 Klaus Spies Method and system for supporting a roof
US4443132A (en) * 1978-06-22 1984-04-17 Bayer Aktiengesellschaft Anchoring of tension members
US4247224A (en) * 1978-12-14 1981-01-27 Ppg Industries, Inc. Method for installing a mine roof bolt
US4307979A (en) * 1978-12-14 1981-12-29 Ppg Industries, Inc. Mine roof bolt and end cap
US4382720A (en) * 1980-01-30 1983-05-10 Wilfried Scheiber Injection liner for a borehole closure
US4744699A (en) * 1986-05-19 1988-05-17 Baker International Corporation Single-pass roof bolt and apparatus and method for installation
US4993876A (en) * 1986-06-16 1991-02-19 501 Sandoz, Ltd. Method and apparatus for protective encapsulation of structural members
US20060278414A1 (en) * 2003-05-12 2006-12-14 Fredrik Oberg Device for rock bolting and for automized rock bolting and rock bolting
US7841803B2 (en) * 2003-05-12 2010-11-30 Atlas Copco Rock Drills Ab Device for rock bolting and for automized rock bolting and rock bolting method
US7178974B1 (en) 2004-08-06 2007-02-20 Bell Marcus O Plural component polymer grout plant
WO2018231118A1 (en) * 2017-06-14 2018-12-20 Epiroc Rock Drills Aktiebolag Arrangement and method for rock reinforcement
EP3663508A1 (de) * 2018-12-04 2020-06-10 Sandvik Mining and Construction Oy Vorrichtung zur zuführung von rohrelementen, gesteinsbohrgestell und verfahren zur unterstützung von bohrlochöffnungen
US11578536B2 (en) 2018-12-04 2023-02-14 Sandvik Mining And Construction Oy Apparatus for feeding tube elements, rock drilling rig and method of supporting drill hole openings

Also Published As

Publication number Publication date
ZA738843B (en) 1974-10-30
FR2211588B1 (de) 1976-11-19
DE2360636A1 (de) 1974-06-06
CA987116A (en) 1976-04-13
JPS4988306A (de) 1974-08-23
FR2211588A1 (de) 1974-07-19
GB1449195A (en) 1976-09-15
AU6290573A (en) 1975-05-29

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