EP3546698A1 - Ensemble d'ancrage de roche pouvant être jointoyé - Google Patents

Ensemble d'ancrage de roche pouvant être jointoyé Download PDF

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Publication number
EP3546698A1
EP3546698A1 EP18164371.9A EP18164371A EP3546698A1 EP 3546698 A1 EP3546698 A1 EP 3546698A1 EP 18164371 A EP18164371 A EP 18164371A EP 3546698 A1 EP3546698 A1 EP 3546698A1
Authority
EP
European Patent Office
Prior art keywords
barrel
sleeve
rock
anchor
rock anchor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18164371.9A
Other languages
German (de)
English (en)
Inventor
Paolo Ettore Pastorino
Adriaan BERGHORST
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NCM Innovations Pty Ltd
Original Assignee
NCM Innovations Pty Ltd
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 NCM Innovations Pty Ltd filed Critical NCM Innovations Pty Ltd
Priority to EP18164371.9A priority Critical patent/EP3546698A1/fr
Publication of EP3546698A1 publication Critical patent/EP3546698A1/fr
Withdrawn legal-status Critical Current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
    • E21D21/0026—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 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
    • 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

Definitions

  • the invention relates to an apparatus for grouting a rock anchor in a rock hole.
  • Grouting of a rock anchor within a rock hole is a difficult and messy affair.
  • a grout conduit connected to a grout source needs to be attached to a grout pipe that projects from the rock hole.
  • the problem is that the rock anchor installation is often at a height that is not easily reached.
  • a connector to connect a nozzle end of the grout conduit to the grout pipe to ensure a sealed connection to prevent grout outflow from the connection interface.
  • the invention at least partially solves the aforementioned problems.
  • a rock anchor assembly which includes a rock anchor comprising a flexible element and a first and a second cylindrical connector element engaged to a proximal end portion and a distal end portion respectively of the element, a tubular sleeve, made at least of a flexible material that longitudinally extends between a first end and a second end, on the rock anchor such that end parts of the rock anchor project from the first and second ends respectively of the sleeve; a load bearing barrel which is centrally bored to engage the first connector element between the first end of the sleeve and a proximal end of the rock anchor, which barrel is adapted to engage with the first end of the sleeve in sealing contact, and which barrel has at least one grout conduit between an exterior surface of the barrel and the bore, which at least one conduit defines a part of a grout passage which communicates the exterior surface of the barrel with an interior of the sleeve, when the barrel is engaged with the sleeve; a seal which seals the grout passage to
  • the flexible element may be a length of cable manufactured from steel or a composite material.
  • the connector elements may be made of a steel or composite material.
  • Each steel connector element may be swaged onto the respective proximal and distal end portions of the cable.
  • the sleeve may have a flared end section which opens onto the first end and an anchor housing section which opens onto the second end.
  • the load bearing barrel may be comprised of a solid body of a suitable metal material which has a domed or conical forward end and an opposed back end.
  • the barrel may have a plurality of grout conduits.
  • the plurality of grout passages may be evenly radially spaced about the body.
  • the tensioning means maybe a nut threaded onto complementary threads formed on the first tubular connector.
  • the assembly may include a tubular spacer on the rock anchor between the first end of the sleeve and the forward end of the barrel or between the back end of the barrel and the tensioning means.
  • the tubular spacer may be made of a suitable plastics material which deforms or breaks when a compressive force is applied to it to collapse or break away from the rock anchor, allowing the rock anchor to move longitudinally relatively to the sleeve between a first position and a second position.
  • the mechanical anchor may be at least partially received within the anchor housing section of the sleeve in an unexpanded configuration when the rock anchor is in the first position.
  • the mechanical anchor may move from the sleeve into an expanded configuration when the rock anchor is in the second position.
  • the assembly may include a grout delivery coupling member which includes a body with a member first end and a member second end and a passage between the ends, a circular distributing channel in a wall of the passage and a grout inlet port in a side of the member which communicates an exterior of the member with the channel, wherein the passage is adapted to at least partially receive the barrel from the member first end and to engage with the barrel in a position in which the at least one grout conduit of the barrel sealingly docks with the channel.
  • a grout delivery coupling member which includes a body with a member first end and a member second end and a passage between the ends, a circular distributing channel in a wall of the passage and a grout inlet port in a side of the member which communicates an exterior of the member with the channel, wherein the passage is adapted to at least partially receive the barrel from the member first end and to engage with the barrel in a position in which the at least one grout conduit of the barrel sealingly docks with the channel.
  • the coupling member may engage with the barrel in a twist-lock manner.
  • the barrel alternatively the coupling member, may have a plurality of bayonet type projections which engage with complementary slots or recesses on the coupling member, alternatively the barrel.
  • a grouting kit for grouting a rock anchor in a rock hole which includes a load bearing barrel which is centrally bored to engage with the rock anchor and which has at least one grout conduit between an exterior surface of the barrel and the bore and a seal which seals the grout conduit, and a grout delivery coupling member which includes a body with a first end and a second end and a passage between the ends, a circular distributing channel in a wall of the cylindrical passage and a grout inlet port in a side of the member which communicates an exterior of the member with the channel, wherein the passage is adapted to receive the barrel from the first end and to engage with the barrel in a position in which the at least one grout conduit sealingly docks with the channel.
  • the load bearing barrel may be comprised of a solid body of a suitable metal material which has a domed or conical forward end and an opposed back end.
  • the barrel may have a plurality of grout conduits.
  • the plurality of grout passages may be evenly radially spaced about the body.
  • the coupling member may engage with the barrel in a twist-lock manner.
  • the barrel alternatively the coupling member, may have a plurality of bayonet type projections which engage with complementary slots or recesses on the coupling member, alternatively the barrel.
  • the invention provides a method of anchoring a rock anchor assembly within a rock hole, the rock anchor assembly including a flexible outer sleeve which extends between a first end and a second end opening; a rock anchor which locates, at least partially, within the sleeve such that end parts of the rock anchor extend beyond the first end and the second end of the sleeve, the rock anchor comprising a flexible cable and a first and a second cylindrical connector element engaged to a proximal end portion and a distal end portion respectively of the cable; with the first cylindrical connector element carrying a mechanical anchor which is at least partly held within the sleeve in a closed position and the second cylindrical connector element being at least partly threaded; a faceplate located over the sleeve; a barrel on the threads of the second connector element and a fastener on the threads between the barrel and a proximal end of the rock anchor; the method including the steps of pre-spacing the barrel from the first end or the pre-spacing of
  • the pre-spacing of the barrel from the first end of the sleeve or the pre-spacing of the fastener from the barrel may be achieved with a tubular spacer which locates on the cable anchor, between the first end of the sleeve and barrel or between the barrel and the fastener.
  • the tubular spacer may be made of a suitable plastics material which deforms or breaks when a force pushing the anchor further into the hole reaches a predetermined level.
  • the method may include the additional steps of engaging a coupling device to the barrel and pumping a grout material from a source through the coupling device and at least one channel provided in a sidewall of the barrel, into an annular space between the sleeve and the cable and, eventually, into an annular space between the sleeve and walls of the rock hole.
  • a rock anchor assembly 10 is provided.
  • the assembly includes a rock anchor which comprises a length of flexible high tensile cable 12, of a steel or composite material, which extends between a distal end 16 and a proximal end, 18.
  • the anchor has a first and a second tubular metal connector element, respectively designated 14A and 14B, each of which is swaged onto a respective end section of the cable by employing a radial swaging method.
  • the connector elements 14 can be made of a composite material which is bonded to the cable by any suitable technique.
  • the first connector element 14A is, at least, partially externally threaded with a threaded section 20.
  • a mechanical anchor 22 locates on the second connector element, towards the distal end 16 of the cable.
  • the mechanical anchor is a standard expansion shell type anchor.
  • the assembly 10 includes an elongate tubular sleeve 24 made of a flexible material such as LDPE, HDPE or polypropylene.
  • a flexible material such as LDPE, HDPE or polypropylene.
  • the material of the sleeve is inherently flexible, increased flexibility is introduced by forming the sleeve with a plurality of relatively flexible sections 24.1 interspersed with relatively inflexible sections 24.2. This provides a corrugated outer surface which aids in providing purchase to a grout column in use.
  • the sleeve extends between a first end 26 and a second end 28. At one end, the sleeve flares into a flared end section 30 which opens on the first end 26. The sleeve also slightly flares at the opposed end, opening onto the second end 28. This slightly flared formation provides an anchor housing section 31.
  • the flared end sections can be integrally formed with the remainder of the sleeve. In another, the sections can be separately made, from a metal material, and riveted to the sleeve.
  • the connector elements 14A and 14B of this embodiment are metal studs with a bore 60 that longitudinally extends only partially through each stud.
  • the distal and proximal ends (16, 18) of the cable are inserted into the bore, in the manufacture of the rock anchor component, the proximal and distal end portions of the cable are fixed within the respective connector element by employing a radial swaging technique.
  • FIGs 8 and 9 illustrate a second embodiment of the invention.
  • the rock anchor assembly 10A has a rock anchor component which comprises the cable 12 and a first and second connector element (14A and 14B).
  • the essential difference between this embodiment and the earlier embodiment (10) is the connector elements are not tubular and the cable does not extend through the element from end to end as is illustrated in Figures 2A to 2D .
  • the sleeve is adapted to receive the cable anchor with a distal end and a proximal end part (16, 18) of the anchor extending beyond the first end and second ends (26, 28) respectively of the sleeve.
  • the sleeve is held in position on the cable by frictional engagement with the anchor 22 which is at least partially received in the anchor housing section 31 of the sleeve as illustrated in Figure 2A .
  • the assembly (10 and 10B) includes a faceplate 32 which as shown in Figures 2A and 2B , rests on an outer surface of the flared end section 30.
  • the sleeve 24 is engaged with the faceplate by passage through a central aperture 34 (see Figure 2C ) of the plate.
  • the assembly (10 and 10B) further includes a barrel 36 comprised of a solid barrel-shaped metal body 38.
  • the body 38 has a domed end 42 and a trailing end 44 with a central bore 46 extending between the ends.
  • a plurality of grout conduits 48 are formed (only one is illustrated in the Figures), uniformly radially spaced, communicating an exterior of the barrel with the bore 46.
  • the rock anchor is passed through the barrel's central bore 46, from the cable's proximal end 18, to locate on the threaded section 20 of the first connector element 14A. This is best illustrated in Figure 4 .
  • a nut 50 is threaded onto the threaded section 20 to eventually contact the trailing end 44 of the barrel's body.
  • a load indicating washer 52 can be interposed between the nut 50 and the trailing end 44 to indicate when load on the barrel has reached a predetermined level.
  • the rock assembly (10 and 10B) Prior to grouting and with the rock anchor received in the sleeve 24 and the faceplate 32 and barrel 30 pre-attached as described, the rock assembly (10 and 10B) is inserted into a pre-drilled rock hole 54 with the distal end 16 of the cable leading.
  • the anchor housing section 31 of the sleeve at least partially covers the mechanical anchor 22, as illustrated in Figure 2A , to retain the anchor in a closed unexpanded position.
  • the sleeve 24 is prevented from further passage into the rock hole by the flared end section 30 making contact with the faceplate.
  • the cable 12 is capable of further movement, axially inwardly relatively to the sleeve, as illustrated in Figure 2B .
  • the cable is rigid enough to be pushed in the axial direction without buckling. This pushing movement forces the mechanical anchor 22 from the confines of the sleeve allowing the anchor to radially expand under spring action into frictional engagement with the surrounding walls of the rock hole 54.
  • the mechanical anchor will thus secure the rock anchor assembly within the rock hole about the second tubular connector element 14B.
  • FIG. 2C and 2D An alternative to the flaring of the sleeve, to provide sealing engagement of the sleeve and the barrel, is illustrated in Figures 2C and 2D .
  • the sleeve is without a flared end.
  • the first end 26 of the sleeve inserts within the bore 46 of the barrel, sealingly abutting an annular ridge 56 on an inside surface of the bore of the barrel.
  • the coupling member 58 includes a body 60 which extends between a first end 62 and an opposed second end 64.
  • the body defines a cylindrical passage 65 which extends between the ends.
  • a circular distributing channel 68 is formed in an inner wall of the cylindrical passage 65.
  • the channel is disposed towards the first end 62.
  • a hole penetrates the channel which leads into a corresponding side projecting inlet port 70.
  • the inlet port is adapted to attach to a grout delivery from a hose (not shown). The port thus communicates with the bore 46 via the hole, the channel and the conduit 48.
  • the cylindrical passage is formed with a locking formation 72 which receives complementary bayonet formations 74 (see Figure 3A ) in twist lock engagement as more fully described below.
  • the bayonet formation laterally extends from an outer surface of the barrel 36 towards the trailing end 44 of said barrel.
  • a respective circular sealing formation 80 is provided, held apart by a spacing ring 82 (see Figure 6 ). Apertures 83 of the ring allow the passage of grout as will be explained more fully below.
  • the coupling member 58 is to be attached to the barrel 36 so that grout, from a source (not shown), can be delivered through the barrel and into the sleeve. Firstly, the grout delivery hose is pre-attached to the inlet port. Secondly, an elevating shaft (not shown) is connected, at one end, to the second end 64 of the coupling member by, for example, receiving the second end within a complimentary shaped recess in the end of the lance. Thereafter, the coupling member 58 is elevated on the shaft and presented to a barrel engaged end of the pre-installed rock anchor assembly 10, the first end 62 of the member leading.
  • the barrel 36 is then partially received into the cylindrical passage 65 from the first end 62 and engaged with the coupling member 58 within the passage. Engagement is achieved by twisting the coupling member relatively to the barrel to receive the bayonet formation 74 of the barrel within the locking formation 72.
  • each of the grout conduits 48 is in planar alignment with the circular distribution channel 68.
  • the opposed sealing formations 80 in the channel seal the docking engagement of the grout conduits with the distributing channel.
  • Grout can now be pumped through the grout delivery hose for delivery to the inlet port 70, through the side hole 69 and into the grout distributing channel 68.
  • grout is circumferentially distributed about the barrel for entry into the central bore 46 through each of the plurality of grout conduits 48. Grout egress from points of contact of the barrel with the coupling member 58 is prevented by the sealing formations 80 which sandwich the channel.
  • the grout passes a band seal 84 which is caused to move away from an exit of each grout conduits to allow the grout to flow into an interior of the sleeve 24 via the bore 46.
  • the grout percolates upwardly until reaching the first end 24 of the sleeve, at which point the grout cascades downwardly into the annular space between the sleeve and the rock-hole walls.
  • Grout is prevented from flowing back into the grout conduits 48 by the band seal 84 which is forced back against the exits of the grout conduits.
  • the cable 12 is grouted within the sleeve 24 which, in turn, is grouted within the rock hole.
  • the barrel 36 and the coupling member do not need to have means to inter-engage. It is also anticipated that the coupling member can be held in place, over the barrel, by an external installation machine or tool.
  • Figure 7 illustrates use of the rock bolt assembly (10A and 10B) which has a tubular spacer 55 made of a suitable plastics material.
  • the spacer 55 provides a suitable offset space (designated 92 on Figures 9A and 9C ) equivalent to the distance of longitudinal travel (also designated 92 on Figure 9C ) that is required of the cable 12 relatively to the sleeve 24, once in the assembly is in the rock hole, to move the mechanical anchor 22 from the confines of the sleeve so that it can radially expand into frictional engagement with the rock hole walls.
  • the tubular spacer 55 is pre-installed to provide a complete unit of the assembly (10A and 10B) and is sandwiched, in this example, between the trailing end 44 of the barrel 36 and the nut 50.
  • the flexibility of the cable 12 and the sleeve 24 allow the assembly (10A and 10B) to be bent sufficiently to allow installation in a narrow stope environment, whilst maintaining all the benefits of the rock bolt assembly of the parent specification i.e. a means of efficient and clean introduction of a grout into the rock hole to grout the rock anchor, a means of mechanically anchoring the rock anchor into the hole before grouting and an improved static load carrying capacity.

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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)
  • Piles And Underground Anchors (AREA)
EP18164371.9A 2018-03-27 2018-03-27 Ensemble d'ancrage de roche pouvant être jointoyé Withdrawn EP3546698A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18164371.9A EP3546698A1 (fr) 2018-03-27 2018-03-27 Ensemble d'ancrage de roche pouvant être jointoyé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18164371.9A EP3546698A1 (fr) 2018-03-27 2018-03-27 Ensemble d'ancrage de roche pouvant être jointoyé

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EP3546698A1 true EP3546698A1 (fr) 2019-10-02

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EP18164371.9A Withdrawn EP3546698A1 (fr) 2018-03-27 2018-03-27 Ensemble d'ancrage de roche pouvant être jointoyé

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112483155A (zh) * 2020-12-01 2021-03-12 顾国凤 一种矿山施工用延展性好的锚杆支护装置
CN112814708A (zh) * 2021-03-01 2021-05-18 浙江普泰克金属制品有限公司 一种隧道用高压注浆组件
WO2021203147A1 (fr) * 2020-04-01 2021-10-07 Innovative Mining Products (Pty) Ltd Ensemble boulon ancré de manière adhésive

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998011324A1 (fr) * 1996-09-09 1998-03-19 Quantax Pty. Ltd. Boulon serre-cable
AU2003231588A1 (en) * 2002-08-02 2003-08-21 DSI Underground Australia Pty Limited Rock Bolt Post Grouting Apparatus
US20050158127A1 (en) * 2004-01-21 2005-07-21 Fergusson Jeffrey R. Yielding strata bolt
WO2016210456A2 (fr) * 2015-06-23 2016-12-29 Ncm Innovations (Pty) Ltd Système de distribution de coulis de ciment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998011324A1 (fr) * 1996-09-09 1998-03-19 Quantax Pty. Ltd. Boulon serre-cable
AU2003231588A1 (en) * 2002-08-02 2003-08-21 DSI Underground Australia Pty Limited Rock Bolt Post Grouting Apparatus
US20050158127A1 (en) * 2004-01-21 2005-07-21 Fergusson Jeffrey R. Yielding strata bolt
WO2016210456A2 (fr) * 2015-06-23 2016-12-29 Ncm Innovations (Pty) Ltd Système de distribution de coulis de ciment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021203147A1 (fr) * 2020-04-01 2021-10-07 Innovative Mining Products (Pty) Ltd Ensemble boulon ancré de manière adhésive
CN112483155A (zh) * 2020-12-01 2021-03-12 顾国凤 一种矿山施工用延展性好的锚杆支护装置
CN112814708A (zh) * 2021-03-01 2021-05-18 浙江普泰克金属制品有限公司 一种隧道用高压注浆组件

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