WO2008128301A1 - Renforcement de formations - Google Patents

Renforcement de formations Download PDF

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Publication number
WO2008128301A1
WO2008128301A1 PCT/AU2008/000571 AU2008000571W WO2008128301A1 WO 2008128301 A1 WO2008128301 A1 WO 2008128301A1 AU 2008000571 W AU2008000571 W AU 2008000571W WO 2008128301 A1 WO2008128301 A1 WO 2008128301A1
Authority
WO
WIPO (PCT)
Prior art keywords
bolt
core
tube
wires
length
Prior art date
Application number
PCT/AU2008/000571
Other languages
English (en)
Inventor
Andrew James Morgan
Original Assignee
Onesteel Wire Pty Limited
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 AU2007902138A external-priority patent/AU2007902138A0/en
Application filed by Onesteel Wire Pty Limited filed Critical Onesteel Wire Pty Limited
Priority to AU2008241376A priority Critical patent/AU2008241376A1/en
Publication of WO2008128301A1 publication Critical patent/WO2008128301A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/12—Ropes or cables with a hollow core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0693—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a strand configuration
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/006—Lining anchored in the rock
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D21/006—Anchoring-bolts made of cables or wires
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D21/0086—Bearing plates
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/104—Rope or cable structures twisted
    • D07B2201/1076—Open winding
    • D07B2201/108—Cylinder winding, i.e. S/Z or Z/S
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2015—Construction industries

Definitions

  • an improved bolt for use in the reinforcing of formations, such as rooves, ceilings, walls etc, especially in mining and construction applications. Whilst the improved bolt finds primary application in secondary support applications, particularly in underground mines to hold layers of rock strata together, it should be appreciated that it can readily be adapted for use in other formation-reinforcing applications.
  • Roof bolting is a technique employed in the mining industry to provide roof support, primarily in mine tunnels etc. Boreholes are drilled upwards into the roof and bolts are inserted into the holes and anchored at the top, sometimes by a split cone, a mechanical anchor, or by resin grout. The bolts are usually installed using a definite pattern so as to clamp together several roof beds to form a composite beam. Such a beam can have a strength considerably greater than the sum of the individual beds acting separately.
  • the bolts employed in roof bolting may be formed from a solid rod or tube, or can be a "composite” bolt, for example, being formed from a series of wire strands. Such a composite bolt is referred to as a "cable bolt”.
  • a bolt for use in reinforcing formations comprising:
  • a second layer of wires having a different lay direction along the length of the core can improve the bolt's torque characteristics and overall strength, in that the torque produced under load can be balanced by the oppositely wound directions of the first and second wire layers.
  • the different lay direction can also allow individual wire diameters in each layer to be optimised to provide for an increased overall bolt strength.
  • each of the first and second wires is arranged to extend in a helical spiral around the core along its length.
  • each wire can be arranged to extend side-by-side to wires on adjacent opposing sides thereof (eg. so as to effectively surround the core).
  • the helical spiral configuration contributes to the strength of the bolt, whilst the extension of the wires along the bolt length provides flexibility to the bolt.
  • the core is defined by a tube.
  • a tube within the bolt allows the bolt to have an in-built grout feed tube (ie. to enable resin grout to be fed through the bolt via the tube, to exit the tube end, then set and anchor the bolt in a borehole).
  • the tube is formed of a flexible material such as a metal or polymeric material. This tube flexibility can be sufficient to allow the bolt to be coiled or wound onto a reel.
  • the core is optimally defined by a flexible tube, in variations the core may be defined by an elongate rigid tube, or a flexible or rigid wire (eg. of metal), or may in the resultant bolt, simply be a space defined by the plurality of first wires.
  • the tube metal can be of steel (eg. a mild steel) having sufficient softness such that it can be coiled prior to use, but having sufficient strength to not collapse when the wires are arranged around it.
  • steel eg. a mild steel
  • the tube polymeric material can be a fire-resistant and/or anti-static polymer, such as a polypropylene PTFE or CPVC polymer.
  • a bolt for use in reinforcing formations comprising:
  • an elongate tube provides the bolt with an in-built grout feed tube.
  • the bolt by providing the bolt with sufficient flexibility such that it can be bent in an arcuate manner, this can allow the bolt to be supplied as part of a longer feedstock and coiled or wound onto a reel. This can allow for eg. in-situ un-reeling (eg. from a bolting apparatus) and/or for custom specification of bolt length. It can also help facilitate insertion of the bolt into rough-formed and/or non-linear boreholes.
  • a bolt for use in reinforcing formations comprising:
  • the bolt of the second and third aspects can be as defined as the bolt of the first aspect.
  • the helical spiral of the second wires can have the same lay direction as the helical spiral of the first wires.
  • the length of wire lay can be different in the adjacent layers to enhance the flexibility of the bolt.
  • the same lay direction of adjacent layers also helps when installing the bolt, as it can eliminate the incidence of "birdcaging" (eg. as a result of one layer (eg. the outer layer) spinning/slipping on the other and burgeoning out when torque is applied to the bolt).
  • the bolt of the first to third aspects typically defines and is employed as a cable bolt for use in the reinforcing of formations such as rooves, ceilings, walls etc in mining and construction applications.
  • a fourth aspect there is provided a method for forming a bolt that is as defined in the first to third aspects, the method comprising the steps of:
  • the machine can arrange one or more layers, that each comprise a plurality of wires, around and along a length of the core to thereby define the bolt.
  • Such a method can produce continuous bolts in a continuous manner, whereby production efficiencies can be attained, as can the capacity to customise bolt sizing (especially length).
  • Such a method can also produce long bolts for reels that can then be customised on site.
  • the resulting bolt can re-fed through the rope-making machine to arrange each of one or more further layers around the first layer.
  • the machine can be configured in the method such that each successive layer can have its wires layed in an opposite lay direction to the immediately preceding layer.
  • the elongate core can be flexible (and it may be defined by a tube) with the flexibility allowing the bolt to be directly wound onto a reel as it leaves the rope-making machine.
  • a method for forming a bolt comprising arranging on an elongate core one or more layers, that each comprise a plurality of wires, around and along a length of the core using a rope-making methodology, to thereby define the bolt.
  • the bolt of the first to third aspects also enables a number of bolt installation and system configurations to be achieved.
  • a fifth aspect there is provided a method for installing a bolt in a formation, the method comprising the steps of:
  • step (ii) has been observed to assist in resisting strata movement earlier in the process of reinforcing a formation.
  • the tension applied to the bolt can be a proportion of the bolt's capacity to be tensioned, for example, at around 30% of the bolt's rated capacity.
  • the fastening medium can comprise a grout that adhesively fastens the tensioned bolt in the formation. Further, in step (i) the bolt end can be fastened in the hole using a mechanical or adhesive fastener (eg. a chemical resin).
  • a mechanical or adhesive fastener eg. a chemical resin
  • step (iii) can involve introducing the fastening medium into the hole via the tubular core.
  • a bolt system for use in supporting a formation.
  • the system may comprise two or more flexible elongate bolts which, when positioned in the formation, can be configured to protrude.
  • the protruding portions can be manoeuvred (eg. bent), whereby adjacent bolt sections can be fastened to each other, for example, fastened together using a coupling (such as a slide/sleeve coupling).
  • Figure IA shows a schematic cross-section through a stratum of rock in which a tunnel has been formed, with a roof in the tunnel being supported by a specific bolt system embodiment;
  • Figure IB shows an enlarged detail of the cross-section of Figure IA;
  • Figure 2 shows a schematic cross-section through a stratum of rock in and to which another specific bolt has been introduced and fastened;
  • Figures 3 and 3 A show perspective and detail schematic views of a first bolt embodiment; and Figures 4 and 4A show perspective and detail schematic views of a second bolt embodiment.
  • Figures 3 and 3 A show perspective and detail schematic views of a first bolt embodiment; and Figures 4 and 4A show perspective and detail schematic views of a second bolt embodiment.
  • Roof bolt 10 comprises an elongate, flexible tube 12 at its core.
  • the actual tube material is selected so as to provide the bolt with sufficient in-use flexibility for arcuate bending, in particular coiling and winding onto a reel, and to be of a long (endless) lengths of a roof bolt material.
  • the tube material is also selected so as to withstand and support the winding therearound of one or more wire layers (ie. so as not to collapse in on itself).
  • a flexible bolt is able to be supplied as part of a longer feedstock such that, when wound onto a reel, it can allow for on-site un-reeling (eg.
  • the tube material is a metal
  • a metal is selected that can provide the bolt with the flexibility characteristics for coiling and winding onto a reel.
  • An optimal tube material has been found to be a mild steel pipe of a grade used in the automotive and refrigeration industries, comprising a single-walled, electric resistance welded tube. In one example, the tube had a diameter of 14.2 mm and a wall thickness of just 0.8 mm. Such a steel tube can be supplied in a coiled form (eg. of lengths up to
  • the tube material is a polymer desirably a material is selected that also provides the bolt with fire resistance and anti static properties, to enable the bolt to comply with the statutory mining regulations that exist in a number of countries (including Australia).
  • the polymer may comprise a polypropylene, a PTFE (polytetrafluoroethylene), or a CPVC (Chlorinated polyvinyl chloride) plastic tube.
  • the tube 12 provides the bolt with an in-built grout feed tube, to enable resin grout to be fed directly through and via the bolt to exit the tube and anchor the bolt in a borehole in use (see Figure 2).
  • the bolt 10 further comprises a first layer of wires 14 arranged around the tube
  • Each wire is arranged to extend in a helical spiral around the tube 12 along its length, with typically each wire in the layer touching (or closely facing) an adjacent wire on either side along its length (ie. so as to effectively surround the tube).
  • the helical spiral configuration contributes to the strength of the bolt, whilst the extension of the wires along the bolt length provides flexibility to the bolt.
  • each second layer wire 16 is arranged around the first layer 14 along its length and so as to define a final bolt configuration (as shown).
  • each second layer wire is arranged to extend in a helical spiral around the first layer along its length but, in one optimal configuration, in an opposite lay direction to the helical spiral of the first wires (as shown).
  • the second layer of wires can improve the torque characteristics and overall strength of the bolt, as can the opposite wire lay configuration.
  • the helical spiral of the second wires can have the same lay direction as the helical spiral of the first wires.
  • the length of wire lay can be different in the adjacent layers to further enhance the flexibility of the bolt.
  • the same lay direction of adjacent layers also helps when installing the bolt, as it can eliminate the incidence of "birdcaging" (eg. as a result of the second layer spinning/slipping on the first layer and burgeoning out when torque is applied to the bolt).
  • the depicted bolt configuration can also allow individual wire diameters to be optimised to provide for an increased overall bolt strength at a given bolt diameter (ie. without increasing bolt diameter).
  • a bolt for use in reinforcing formations is shown in the form of a second roof bolt 20.
  • Roof bolt 20 again comprises a flexible tube 12 at its core, and also comprises first and second wire layers 14, 16.
  • bolt 20 further comprises a third similar layer of wires 22 that is arranged around the second layer 16 along its length to define a final bolt configuration (as shown).
  • each third layer wire is arranged to extend in a helical spiral around the second layer along its length, and in an opposite lay direction to the helical spiral of the second wires.
  • the third wire layer can thus further improve the torque characteristics and overall strength of the bolt, as can the additional opposite wire lay configuration.
  • all three layers can have the same direction, or just the inner two or the outer two. These different configurations can each impart difference performance characteristics to the bolt.
  • the roof bolts 10 and 20 are each referred to as a "cable bolt". Cable bolts are typically employed in the reinforcing of formations such as rooves, ceilings, walls etc in mining and construction applications, usually in secondary reinforcing applications, to complement the primary reinforcing performed by rod- or tube-type roof bolts.
  • roof bolt 50 (which can be formed using either one of roof bolts 10 or 20 as its basis) is shown positioned in a borehole B drilled into rock stratum S. It will be seen how the tube 12 protrudes slightly from both the proximal and distal ends of the bolt to enable a resin- based grout to be easily introduced into the tube, and to be released from the tube distal end and into the borehole adjacent to the bolt. When this grout cures it anchors the bolt in the bolthole.
  • the upper end of the bolt 50 was fastened in the borehole B using a mechanical fastener (eg. split cone or anchor) or an adhesive fastener (eg. a chemical resin capsule). Tension was then applied to the bolt at a proportion of the bolt's capacity to be tensioned (eg. typically at around 30% of the bolt's rated capacity). A bolt fastening grout was then fed into the hole, being pumped up through the tube 12, to surround and fasten the tensioned bolt in the borehole.
  • This mode of installation ie. pre-tensioning of the bolt prior to grouting
  • the bolt 50 includes an externally threaded section 52 fastened (typically by swaging) to the proximal end of the cable portion 54 of the bolt.
  • the threaded section 52 protrudes beyond the borehole as shown to enable a retaining plate 56 to be coupled thereto.
  • the borehole B is widened at W adjacent to its entry to accommodate therein a collar 58 that carries the plate 56.
  • the collar is screw-mounted onto the threaded section 52, until the plate 56 engages against the roof surface S adjacent to the borehole, thereby causing an annular gasket 60 to seal against the roof surface S.
  • the plate is locked in position by a locking nut 62 that is also screw-mounted onto the threaded section 52.
  • FIG. 1 a bolt system 100 for use in supporting a formation in the form of the roof R of a tunnel T in a rock stratum S is depicted, hi its simplest form the system is shown and described as employing two flexible elongate bolts 102, 104 (which again can each be formed using any one of roof bolts 10 or 20 as its basis). However, multiple bolts and bolt connectors may be employed depending on the application.
  • each bolt 102, 104 extends into a respective borehole B where it can be secured by a resin-based grout (as mentioned above).
  • Each bolt is sized (eg. cut to size on site) so that a respective protruding portion 106 or 106' extends out from the borehole. Due to the flexibility of the bolt the protruding portion can be manoeuvred such that adjacent sections can be located next to and be fastened to each other (as best shown in the detail of Figure IA).
  • the adjacent sections are fastened to each other using a sleeve coupling 108 (which may additionally be bonded/fastened to the adjacent sections by the resin-based grout, or by welding, crimping etc).
  • the resultant joined bolts 102. 104 combine to provide a type of beam that underlies and thus supports an overlying part of the roof R.
  • a supporting "net"-type structure can rapidly and economically be defined.
  • a rope-making methodology was employed that generally comprised successively arranging on the core 12 the one or more wire layers 14, 16, 22 to thereby define the bolt. This methodology was best facilitated by feeding the core 12 into a rope-making machine, and then operating the machine to arrange the one or more wire layers around and along the length of the core to thereby define the bolt.
  • the strand was passed into another stranding (rope-making) machine that was operated in the opposite direction, so that the second layer 16 was arranged in an opposite lay direction over the first layer.
  • wire spools in the machines were configured to achieve the opposite wire-lay direction.
  • the two-layered bolt was again re-fed through the rope- making machine to arrange the third wire layer 22 around the second layer, hi this regard, the wire spools were configured to achieve an opposite wire-lay direction to the second layer.
  • a cable bolt as per Figures 2 to 4 was produced on a multi cage rope-making machine having two separate cages which each held a respective bobbin of wire.
  • Each bobbin was loaded with a drawn high tensile 1770 MPa grade bright steel wire having a smooth external surface (ie. no ribs or deformation made on the surface of the wire during drawing).
  • a flexible tube of steel or plastic was fed through the centre of the machine from a payoff stand.
  • the cages were then successively rotated in opposite directions for each wire layer, laying up the wire in one direction over the tube then in the other direction over the first layer, and so on.
  • a plastic tube was selected that had fire resistant and anti static properties to comply with statutory requirements of mining cable bolt usage.
  • the machine produced a 500m (3Tonne) cable bolt reel comprising wire of 1 x
  • the resultant bolt ends could optionally be ground to a smooth finish, and a 12mm square was welded on to one end of each strand.
  • One such two-layered bolt had
  • a number of tube core alternatives were also investigated to produce a bolt that was durable, was able to be reeled and loaded on take up, and that did not crush when wire was laid over it.
  • a plastic core tube it was surmised that drawn poly tube would not be viable so extruded poly tube was employed.
  • a theoretical cable breaking load of 1010 kN was predicted. The breaking load and top feeding were identified as the key product elements.
  • a bolt having a steel core tube, with 14 inner wires and 17 oppositely laid outer wires was produced that had a 634kN capacity. Because the bolt was continuously made on a ropemaking machine it was able to be made in continuous (un-ending) lengths.
  • Existing cable bolts such as the Megabolt are made in discrete lengths, whereas the present bolt was able to be produced into a bulk reel of eg. 1000 - 2000 m of bolt product, which could subsequently be cut to length as required.
  • Tension was applied to the bolt using a tensioner unit, to a level that was around 30% of the bolt's capacity (ie. in the case of a 634kN capacity, a tension force of around 19OkN was applied to the bolt to pre-tension it).
  • a resin-based grout was then bottom fed up through the central tube hole, to exit the tube distal end and flow down and around the bolt, and was provided with sufficient time to set/cure.
  • the tensioner unit was then re-activated to the bolt strand and further tension was applied.
  • the length of bolt was able to be varied on site, depending upon the composition of the rock strata to be supported.
  • the bolts were typically used in a secondary support role (ie. to be used in conjunction with primary support (standard rod) roof bolts made from solid rod.
  • the bolts were used to provide extra reinforcing where underground crossovers, or access areas to longwall, required a permanent structure.
  • the core may be defined by an elongate rigid tube (eg. of metal), or may simply comprise a space defined by the plurality of first wires in a resultant formed bolt.
  • the core may in some forms (eg. with the opposite lay directions of adjacent layers) comprise a king wire.

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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)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Ropes Or Cables (AREA)

Abstract

L'invention concerne un boulon (10,20), destiné à être utilisé pour renforcer des formations (S), qui comprend une pluralité de premiers câbles (14) disposés autour d'un noyau (12), dans un premier sens de disposition le long d'une longueur du noyau, et une pluralité de deuxièmes câbles (16) disposés autour des premiers câbles, dans un deuxième sens de disposition différent le long de la longueur du noyau. Une troisième couche de câbles (22) peut être prévue, dans le même sens de disposition que celui de la première ou de la deuxième couche, ou dans un sens de disposition différent. Le noyau peut comprendre un tube (par exemple, en acier ou en polymère), qui présente une souplesse suffisante pour pouvoir être courbé de manière à former un arc. Ceci est susceptible de conférer de la souplesse au boulon. L'invention concerne également un procédé destiné à former et à installer le boulon, ainsi qu'un système qui utilise deux ou plusieurs boulons, qui présentent des parties faisant saillie qui peuvent être attachées ensemble.
PCT/AU2008/000571 2007-04-23 2008-04-23 Renforcement de formations WO2008128301A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2008241376A AU2008241376A1 (en) 2007-04-23 2008-04-23 Reinforcing of formations

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007902138A AU2007902138A0 (en) 2007-04-23 Reinforcing of formations
AU2007902138 2007-04-23

Publications (1)

Publication Number Publication Date
WO2008128301A1 true WO2008128301A1 (fr) 2008-10-30

Family

ID=39874996

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000571 WO2008128301A1 (fr) 2007-04-23 2008-04-23 Renforcement de formations

Country Status (2)

Country Link
AU (1) AU2008241376A1 (fr)
WO (1) WO2008128301A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011078767A1 (de) 2011-07-07 2013-01-10 Hilti Aktiengesellschaft Litzenanker
EP2603666A4 (fr) * 2010-08-10 2015-12-30 Fci Holdings Delaware Inc Boulon à câble entièrement cimenté
US9512720B2 (en) 2012-09-14 2016-12-06 Fci Holdings Delaware, Inc. Cable bolt

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112081602A (zh) * 2020-07-27 2020-12-15 枣庄矿业(集团)付村煤业有限公司 一种厚煤层综采工作面超前支护工艺

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1373814A (en) * 1971-04-26 1974-11-13 Bridon Ltd Tubular strand and rope
SU1469162A1 (ru) * 1987-01-29 1989-03-30 А.А.Хидиров Способ подготовки горной выработки дл перехода очистным механизированным комплексом
EP0379388A2 (fr) * 1989-01-23 1990-07-25 Inco Limited Boulon d'ancrage creux en câbles
WO1993003256A1 (fr) * 1991-07-26 1993-02-18 J.J.P. Geotechnical Engineering Pty. Ltd. Cheville de fixation en forme de cable
WO1993012324A1 (fr) * 1991-12-19 1993-06-24 Bridon, Plc Boulons d'ancrage souples
US5443332A (en) * 1992-12-17 1995-08-22 Exchem Plc Rockbolt tensioning
RU2177550C1 (ru) * 2000-06-28 2001-12-27 Государственный научно-исследовательский институт горной геомеханики и маркшейдерского дела - Межотраслевой научный центр (ВНИМИ) Способ крепления горных выработок

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1373814A (en) * 1971-04-26 1974-11-13 Bridon Ltd Tubular strand and rope
SU1469162A1 (ru) * 1987-01-29 1989-03-30 А.А.Хидиров Способ подготовки горной выработки дл перехода очистным механизированным комплексом
EP0379388A2 (fr) * 1989-01-23 1990-07-25 Inco Limited Boulon d'ancrage creux en câbles
WO1993003256A1 (fr) * 1991-07-26 1993-02-18 J.J.P. Geotechnical Engineering Pty. Ltd. Cheville de fixation en forme de cable
WO1993012324A1 (fr) * 1991-12-19 1993-06-24 Bridon, Plc Boulons d'ancrage souples
US5443332A (en) * 1992-12-17 1995-08-22 Exchem Plc Rockbolt tensioning
RU2177550C1 (ru) * 2000-06-28 2001-12-27 Государственный научно-исследовательский институт горной геомеханики и маркшейдерского дела - Межотраслевой научный центр (ВНИМИ) Способ крепления горных выработок

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2603666A4 (fr) * 2010-08-10 2015-12-30 Fci Holdings Delaware Inc Boulon à câble entièrement cimenté
DE102011078767A1 (de) 2011-07-07 2013-01-10 Hilti Aktiengesellschaft Litzenanker
US9512720B2 (en) 2012-09-14 2016-12-06 Fci Holdings Delaware, Inc. Cable bolt

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Publication number Publication date
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