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WO2008154683A1 - Tensionnement d'armatures de boulons d'ancrage - Google Patents

Tensionnement d'armatures de boulons d'ancrage Download PDF

Info

Publication number
WO2008154683A1
WO2008154683A1 PCT/AU2008/000882 AU2008000882W WO2008154683A1 WO 2008154683 A1 WO2008154683 A1 WO 2008154683A1 AU 2008000882 W AU2008000882 W AU 2008000882W WO 2008154683 A1 WO2008154683 A1 WO 2008154683A1
Authority
WO
WIPO (PCT)
Prior art keywords
tendon
tube
rock
tensioning
nut
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.)
Ceased
Application number
PCT/AU2008/000882
Other languages
English (en)
Inventor
David James Fergusson
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.)
Industrial Roll Formers Pty Ltd
Original Assignee
Industrial Roll Formers 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
Priority claimed from AU2007903322A external-priority patent/AU2007903322A0/en
Application filed by Industrial Roll Formers Pty Ltd filed Critical Industrial Roll Formers Pty Ltd
Publication of WO2008154683A1 publication Critical patent/WO2008154683A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • E21D21/008—Anchoring or tensioning means
    • 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
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0086—Bearing plates

Definitions

  • the present invention relates to rock bolts and, in particular, to the tensioning of the tendons of rook bolts.
  • Such tendons can be either cables or solid rods.
  • the genesis of the present invention is a desire to provide a means whereby rock bolt tendons can be tensioned without the use of expensive and heavy hydraulic cable jacks.
  • a rock bolt tendon tensioning device comprising a hollow trumpet tube having one end flared and an externally threaded cylindrical portion, a nut carried by said threaded portion and engageable with a Washer like pressure plate through an aperture of which said threaded, portion can pass, and a tendon clamp shaped to grasp said threaded tendon and mate with said flared end.
  • a method of tensioning a rock bolt having a tendon with an anchor at one end and the tensioning device as defined above at the other end comprising the steps of: (t) inserting said tendon one end into a blind hole drilled in a rock or mineral face, (Ii) if necessary activating said anchor to secure same to the interior of said hole adjacent said anchor, (iii) clamping said tendon clamp onto said tendon and adjacent said flared end, and (iv) rotating said nut relative to said tube to simultaneously drive said flared end against said tendon clanip and drive said pressure plate into abutment with said rock or mineral face to thereby tension said tendon.
  • a method of tensioning a rock bolt having a tendon with a leading end and the tensioning device as defined above at the other end comprising the steps of: (i) inserting said tendon leading end into a blind hole drilled in a rock or mineral face, ( ⁇ ) chemically anchoring said tendon in said hole to secure same to the interior of said hole,
  • an arresting device for use in dynamic seismic shock events, said device comprising a rock bolt having a tendon having its leading end anchored " within a blind hole drilled in a rock or mineral face and having a tensioning device as defined above at its trailing end, wherein a seismic shock is indicated by deformation of said trumpet tube.
  • a tensioning device for rock bolt tendons having a threaded trailing end
  • said device comprising a hollow tube having an externally threaded cylindrical portion, a first nut carried by said threaded portion and engageable with a washer like pressure plate through an aperture of which said threaded portion can pass, and a second nut threadably engaged with said tendon trailing end and abutting said tube,
  • a method of tensioning a rock bolt having a tendon with an anchor at one end and the tensioning device as defined in the preceding paragraph at the other end comprising the steps of: (i) inserting said tendon one end into a blind hole drilled in a rock or mineral face, ( ⁇ ) if necessary activating said anchor to secure same to the interior of said hole adjacent said anchor, (iii) tightening said second nut to abut same against said tube, and
  • an arresting device for use in dynamic seismic shock events, said device comprising a rock bolt having a tendon having its leading end anchored within a blind hole drilled in a rock or mineral face and having a tensioning device as defined in the fifth aspect at its trailing end, wherein a dynamic seismic shock is indicated by deformation of said tube.
  • Fig. 1 is a side elevation of the trailing end of a first embodiment of a rock bolt having a cable tendon and carrying a tensioning device of the first preferred embodiment
  • Fig. 2 is a longitudinal cross-section through the trailing end of the cable bolt of Fig. 1 but showing the bolt in the installed condition
  • Fig. 3 is a view similar to that of Fig. 2 but of that of a bolt of a second preferred embodiment
  • Fig. 4 shows the bolt of Fig. 3 after plastic deformation
  • a rock bolt 1 has a tendon 2 which in this instance takes the form of a braided steel cable but could equally be a solid rod.
  • a hollow trumpet tube 4 has a flared trailing end 5 and a tubular portion 6 which has an external thread 7.
  • the externally threaded portion 7 carries a conventional nut 8 and an apertured washer like pressure plate 9.
  • a cable clamp 13 which preferably takes the form of a longitudinally split sleeve having an external frusto- conical surface 14 and a rubber keeper ring 15 to maintain together its three portions.
  • the rock bolt 1 is installed in a blind hole 17 drilled in a iock or mineral face 18.
  • the leading end (not illustrated) of the tendon 2 is anchored at the far end of the blind hole 17. It will be seen that with the cable clamp 13 installed on the tendon 12, rotating the nut 8 so as to drive it towards the pressure plate 9, simultaneously drives the flared end 5 into abutment against the cable clamp 13 and drives the pressure plate 9 into abutment against the rock face 18, thereby tensioning the tendon 2.
  • the above described device has a number of uses.
  • the first use is as a substitute for a hydraulic cable jack for the tensioning of rock bolts having cable tendons.
  • the device can be tensioned merely by means of a spanner and that, if desired, a tube and a hammer can be used to drive the cable clamp 13 along the tendon 2 so as to engage the cable clamp 13 and the flared end of the "trumpet tube 4. This anchors the trumpet tube 4 relative to the tendon 2 and enables the nut 8 to be tightened in. order to place the tendon 2 into tension.
  • the leading end (not illustrated) of the tendon 2 carries a conventional mechanical anchor
  • this anchor can be secured adjacent the uphole end of the blind hole 17 and the nut 8 rotated so as to tension the tendon 2.
  • This tension can be either a pre-tension or a post-tension in terms of grouting.
  • the annular space between the tendon 2 and the blind hole 17 is filled with grout.
  • the grout one of which uses a breather tube which extends to the uphole end of the blind hole so as to enable air within the blind hole to escape from the hole via the breather tube as the grout is progressively introduced into the blind hole 17 from adjacent the rock face 18.
  • a length of cable which is to form the tendon 2 is fed into the blind hole 17 and retained in place by the use of a wire retaining device commonly known as a "fish hook".
  • the tendon 2 is then grouted utilising grout, a breather tube, and a soft wadding or soft rubber material to plug the open end of the blind hole 17.
  • the pressure plate 9, trumpet tube 4 with its nut S, and the cable clamp 13 are slid over the trailing end 12 of the tendon 2 until the nut 8 is in contact with the pressure plate 9.
  • the cable clamp 13 is then tapped into position to engage the flared end 5.
  • the nut 8 is then rotated so as to drive the pressure plate 9 against the rock face 18 and thereby obtained the desired degree of tension within the tendon 2.
  • the rock bolt 1 can be pre-tensioned or post-tensioned in relation to the grouting process without the use of the conventional hydraulic cable jack.
  • a spanner for the nut 8 is essentially the only tool required for the installation.
  • a piece of tube which is passed over the trailing end 12 in order to drive the cable clamp 13 into the flared end 5, and a hammer to drive the tube, are preferable, but optional pieces of additional equipment.
  • the abovernentioned arrangement can also be used as an arresting device for a dynamic event such as seismic shock loading.
  • This compression of the column formed by the trumpet tube 4 provides a visual indication of the event loading on the fixture and yet maintains a full loading capacity after the event. This is because the plastically deformed tube 4 has not let go of the tendon 2, even though it will have moved to the left as seen in Fig. 2. That is, the distance between the cable clamp 13 and the nut 8 will have been significantly shortened by the seismic event. It will be appreciated that the plastic deformation of the tube in response can be controlled by selection, of material thicknesses or chemistry, for example.
  • a second eiribodiment is illustrated in the form of a rock bolt 21 having a solid tendon 22.
  • An externally threaded tube 24 is slid over the trailing end 32 of the tendon 22.
  • the nut 8, pressure plate 9, hole 17 and rock face 18 are as before, However, the trailing end 32 of the tendon 22 is externally threaded and carries a second nut 39.
  • the second nut 39 is tightened to prevent the tube 4 moving to the left as seen in Fig. 3. Also the nut 8 is tightened to drive the pressure plate 9 into abutment with the rock face 18 and tension the tendon 22.
  • the tendon 2 can be a cable, a solid rod or even a hollow tubular rod.

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)
  • Piles And Underground Anchors (AREA)

Abstract

L'invention concerne un dispositif de tensionnement d'armature de boulon d'ancrage qui comprend un tube en entonnoir creux possédant une extrémité évasée et une partie cylindrique à filetage externe. Un boulon est porté par la partie filetée, lequel boulon peut entrer en contact avec une cale du type rondelle via une ouverture permettant le passage de la partie filetée. Le dispositif de l'invention comprend également un collier de serrage d'armature destiné à serrer l'armature et à s'accoupler avec l'extrémité évasée.
PCT/AU2008/000882 2007-06-21 2008-06-19 Tensionnement d'armatures de boulons d'ancrage Ceased WO2008154683A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007903322 2007-06-21
AU2007903322A AU2007903322A0 (en) 2007-06-21 Rock Bolt Tendon Tensioning

Publications (1)

Publication Number Publication Date
WO2008154683A1 true WO2008154683A1 (fr) 2008-12-24

Family

ID=40155807

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000882 Ceased WO2008154683A1 (fr) 2007-06-21 2008-06-19 Tensionnement d'armatures de boulons d'ancrage

Country Status (1)

Country Link
WO (1) WO2008154683A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019971A1 (fr) 2008-08-11 2010-02-18 Sandvik Mining And Construction Rsa (Pty) Ltd Câble d'ancre pour la roche
CN103233754A (zh) * 2013-05-13 2013-08-07 蔡青林 一种矿用锚索张拉机具
CN108303332A (zh) * 2018-03-12 2018-07-20 湖南科技大学 一种研究预应力锚杆动态力学特性的装置及方法
WO2018206628A1 (fr) * 2017-05-11 2018-11-15 Sandvik Intellectual Property Ab Boulon d'ancrage à frottement
CN111502720A (zh) * 2020-05-28 2020-08-07 淮南矿业(集团)有限责任公司 一种可注浆的实心锚杆
CN111594242A (zh) * 2020-05-15 2020-08-28 浙江聚能岩土锚固研究有限公司 预应力涨壳锚杆及其施工方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993003256A1 (fr) * 1991-07-26 1993-02-18 J.J.P. Geotechnical Engineering Pty. Ltd. Cheville de fixation en forme de cable
US5525013A (en) * 1994-10-31 1996-06-11 Seegmiller; Ben L. Cable bolt structure and related components
US20070009330A1 (en) * 2005-06-17 2007-01-11 F. M. Locotos Co., Inc. Mine roof cable bolt and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993003256A1 (fr) * 1991-07-26 1993-02-18 J.J.P. Geotechnical Engineering Pty. Ltd. Cheville de fixation en forme de cable
US5525013A (en) * 1994-10-31 1996-06-11 Seegmiller; Ben L. Cable bolt structure and related components
US20070009330A1 (en) * 2005-06-17 2007-01-11 F. M. Locotos Co., Inc. Mine roof cable bolt and method

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019971A1 (fr) 2008-08-11 2010-02-18 Sandvik Mining And Construction Rsa (Pty) Ltd Câble d'ancre pour la roche
CN103233754A (zh) * 2013-05-13 2013-08-07 蔡青林 一种矿用锚索张拉机具
WO2018206628A1 (fr) * 2017-05-11 2018-11-15 Sandvik Intellectual Property Ab Boulon d'ancrage à frottement
WO2018206630A1 (fr) * 2017-05-11 2018-11-15 Sandvik Intellectual Property Ab Boulon d'ancrage à frottement
CN110621848A (zh) * 2017-05-11 2019-12-27 山特维克知识产权股份有限公司 摩擦岩石锚杆
CN110662883A (zh) * 2017-05-11 2020-01-07 山特维克知识产权股份有限公司 摩擦岩石锚杆
US11131190B2 (en) 2017-05-11 2021-09-28 Sandvik Intellectual Property Ab Friction rock bolt
US11585220B2 (en) 2017-05-11 2023-02-21 Sandvik Intellectual Property Ab Friction rock bolt
CN108303332A (zh) * 2018-03-12 2018-07-20 湖南科技大学 一种研究预应力锚杆动态力学特性的装置及方法
CN108303332B (zh) * 2018-03-12 2023-11-03 湖南科技大学 一种研究预应力锚杆动态力学特性的装置及方法
CN111594242A (zh) * 2020-05-15 2020-08-28 浙江聚能岩土锚固研究有限公司 预应力涨壳锚杆及其施工方法
CN111502720A (zh) * 2020-05-28 2020-08-07 淮南矿业(集团)有限责任公司 一种可注浆的实心锚杆

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