WO2013173901A1 - Boulon d'ancrage et procédé d'installation d'un boulon d'ancrage - Google Patents

Boulon d'ancrage et procédé d'installation d'un boulon d'ancrage Download PDF

Info

Publication number
WO2013173901A1
WO2013173901A1 PCT/CA2012/050338 CA2012050338W WO2013173901A1 WO 2013173901 A1 WO2013173901 A1 WO 2013173901A1 CA 2012050338 W CA2012050338 W CA 2012050338W WO 2013173901 A1 WO2013173901 A1 WO 2013173901A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular expandable
bolt
bolt portion
protecting sleeve
expandable bolt
Prior art date
Application number
PCT/CA2012/050338
Other languages
English (en)
Inventor
Mario Bureau
Paul Lambert
Chris CRANFORD
Original Assignee
Atlas Copco Canada Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Atlas Copco Canada Inc. filed Critical Atlas Copco Canada Inc.
Priority to CA2872252A priority Critical patent/CA2872252C/fr
Priority to SE1451381A priority patent/SE540189C2/en
Priority to PCT/CA2012/050338 priority patent/WO2013173901A1/fr
Publication of WO2013173901A1 publication Critical patent/WO2013173901A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
    • 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
    • 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
    • E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing 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
    • E21D21/008—Anchoring or tensioning means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like
    • F16B13/122—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like made from a sheet-metal blank

Definitions

  • the invention relates to a rock reinforcement bolt having a tubular expandable bolt portion with a closed cross section for expansion inside a bore hole, the tubular expandable bolt portion having a longitudinal extension, the bolt further having a connecting portion for the connection of a pressure source and a support portion.
  • the invention also relates to a method of installing a rock reinforcement bolt as above.
  • Rock reinforcement bolts are used for securing roof and walls in tunnels and in mines against instable rock which might jeopardize safety of operators and machines inside such spaces .
  • bolts used for rock reinforcement purposes can be categorized in a number of categories: grouted bolts, mechanically expandable bolts and fluid expandable bolts.
  • the bolt installation has to be adapted for example by varying distribution of bolts and bolt lengths.
  • WO 2005/113939 Al wherein a length of a tubular expandable bolt portion is determined so as to allow sliding of the bolt portion in case of excessive loads.
  • WO 03/062599 Al wherein at least one expandable element is included in a boring rod of a boring device.
  • WO 2008/019409 Al which relates to a
  • a rock reinforcement bolt of the kind indicated above wherein: at least one protecting sleeve is arranged on an outside of the tubular expandable bolt portion, and each protecting sleeve is displaceable along the extension of the tubular expandable bolt portion and is fastenable thereon in a chosen
  • the user can adapt and customize the energy absorbance location and/or capacity of the rock bolt to match rock mass conditions at the particular site.
  • the performance of the bolt does not depend on grout or resin and problems associated with
  • protecting sleeve (-s) increases bolt energy absorption capabilities and bolt ability to tackle considerable movements in areas subjected to relative rock movement in the bolt hole area.
  • Increase of resistance in areas expected to move in the rock can be further enhanced by selecting high strength material sleeves.
  • the invention makes it possible to localize and position sleeves to match rock mass conditions to zones of expected fracture or convergence immediately before installation. This can be made by per se known investigations of rock bodies or simply by inspecting the particular bore hole.
  • the sleeves considerably increase bolt ability to withstand otherwise harmful rock movements.
  • the sleeves can be made from many materials and high strength steel sleeves can be used to further increase resistance.
  • each protecting sleeve is fastenable on the outside of the tubular expandable bolt portion by means of at least one from the group: a locking ring, a locking clip, a locking clamp, a locking band, a locking tape, an adhesive medium. These elements are then arranged so as to engage the outside of the tubular expandable bolt portion and the sleeve.
  • the material in the protecting sleeve is advantageously a metal, a ceramic or a synthetic material.
  • Steel is
  • the bolt will have the ability to have tensile deformation extended to virtually a whole sleeve length (or plural sleeve lengths in case of plural adjacent positioned sleeves) because the tubular expandable bolt portion being allowed to elongate evenly over that length since it is isolated from frictional contact with the bolt hole wall.
  • the protecting sleeve length is preferably related to a width of an expected rock movement zone so as to adapt to prevailing conditions.
  • One important aspect of the invention is that it has been made possible to control the installed bolt or parts thereof so as to provide "full anchorage capacity" or not vis-a-vis the bolt hole wall as required and desired.
  • anchorage limit length Below a certain length of engagement between the fluid expandable bolt and the bolt hole wall, what is here called “anchorage limit length", the bolt will not reach full anchorage capacity, which will result in sliding movement of the bolt inside the hole in case of loads in excess of an anchorage limit.
  • this could be exploited by positioning sufficiently long protecting sleeves on a bolt at chosen ' positions and let remaining exposed portion or portions (which will come into engagement with the hole wall after expansion) of the bolt have length/lengths being below said anchorage limit length. This could be
  • the exposed portion or portions in engagement with the hole wall will slide inside the bore hole at the occurrence of greater loads. This sliding movement will absorb energy of the seismic event by way of a friction force between the bolt and the surrounding bolt hole wall .
  • the bolt will never reach a point of failure because due to the lowered anchorage below said anchorage limit, the bolt will maintain its integrity and continue to be functional to hold the surrounding fractured rock.
  • the anchorage limit length is close to 0,5 meters. Lengths below that value will result in sliding of the bolt before failure when subjected to a high load, lengths above that value will result in failure of the bolt before sliding when subjected to a high load. Maximum load absorbed before bolt failure has been about 240 kN for the tested bolts. This means that sliding of a bolt with reduced engagement length below the anchorage limit length will start at loads below 240 k . Typically the tested bolt is intended for loads up to 200 kN. In order to ensure security, it is recommended to perform tests for the chosen bolt in the rock in question.
  • the invention also concerns a protecting sleeve being dimensioned to be positioned on an outside of the tubular expandable bolt portion and inside a bolt hole, the protecting sleeve having inside dimensions so as to be displaceable along the extension of the tubular expandable bolt portion and be fastenable thereon in a chosen longitudinal position on the tubular expandable bolt portion.
  • Fig. 1 shows a rock bolt according to the invention with a displaceable protecting sleeve
  • Fig. 2 shows the rock bolt according to Fig. 1 with the protecting sleeve fastened in a chosen position
  • Fig . 3 shows the rock bolt in Figs . 1 and 2 inserted into a bore hole and with a connection established with a pressure source
  • Fig. 4 shows the rock bolt of Fig. 3 in the expanded state and installation completed
  • Fig. 5 shows a cross section of the tubular expandable bolt portion of the rock bolt i its initial condition.
  • Fig. 6 shows the tubular expandable bolt portion in its expanded condition
  • Fig. 7 shows a cross section of the rock bolt according to the invention with a section through a region where a protective sleeve covers a part of the tubular expandable bolt portion
  • Figs. 8-10 show different alternatives for securing one or more protecting sleeves on the tubular expandable bolt
  • Fig. 11 indicates a method sequence according to the
  • Fig. 1 shows a rock reinforcement bolt 1 having a tubular expandable bolt portion 2 which is of a kind having a closed cross section and which in its non-expanded condition
  • the tube has a closed cross sectional portion in the area of the deep longitudinal depression and the tube is closed at the distal end thereof.
  • the radial dimensions of the non expanded portion are made such that it is easy to insert into a bore hole .
  • a protecting sleeve 5 is displaceable along the length of the portion 2.
  • a connecting portion 3 at a proximal end of the bolt 1 is for the connection of a pressure source to an inside of the tubular expandable bolt portion.
  • a support portion 4 is arranged for support against a rock face (12 in Fig.3) in the region of a mouth of a bore hole. 6 indicates a distal end portion.
  • Fig. 2 shows the rock bolt according to Fig. 1 with the protecting sleeve fastened in a chosen position by means of locking elements such as clips, bands etc. It is within the scope of the invention also to use adhesives such as glues or tapes to lock the protecting sleeve at the chosen position on the bolt.
  • Fig. 3 shows the rock bolt in Figs. 1 and 2 inserted into a bore hole 8 and with a connection 9 established with a pressure source 10 for subsequent expansion of the bolt.
  • 11 indicates a crack in the rock body where a relative movement of rock portions on either side of the crack 11 can be expected.
  • the positioning of the protecting sleeve bridging the crack supports the relatively soft and sensitive material of the bol .
  • 11 indicates a support plate being applied against the rock face 12 in a per se known manner.
  • Fig. 4 shows the rock bolt of Fig. 3 in the expanded state and with the installation completed.
  • the portions 2a and 2b only of the tubular expandable bolt portion 2 have been regularly expanded.
  • Fig. 5 shows a cross section of the tubular expandable bolt portion 2 of the rock bolt in its initial condition inside a bore hole 8.
  • tubular expandable bolt portion 2 has been subjected to internal pressure from a pressure fluid source such that it has been made to expand and to tightly contact the inside of the bore hole 8.
  • the length of the material in the cross section 2 exceeds the inner circumference of the bore hole 8 so as to ensure proper and permanent contac .
  • Fig. 7 shows a cross section through the rock bolt according to the invention in a region where it is provided with a protecting sleeve 5 surrounding the tubular expandable bolt portion 2.
  • the protecting sleeve thus ensures that the part of the bolt being inside the sleeve is isolated from the bolt hole wall and thereby is allowed to lengthen over the entire length of the sleeve or sleeves.
  • the protecting sleeve is made in a resistant material such as steel which has the properties of resisting movements of rock portions.
  • Fig. 8 is shown an alternative manner of fastening the protecting sleeve 5 to the tubular expandable bolt portion 2 by means of only one clamping and locking element 7 which is positioned on an outside of the protecting sleeve 5 as seen in an insertion direction being to the right in Fig. 8. It is understood that during insertion of the rock bolt 1 of Fig. 8 into a bore hole, the locking element 7 prevents sliding of the protecting sleeve 5 from the chosen direction and in this case no additional locking element is necessary at position 17 on the inside of the protecting sleeve 5.
  • Pig. 9 shows an example where two protecting sleeves 5a and 5b are positioned adjacent to one another and being secured by locking elements 7 such as clips.
  • FIG. 10 shows a further embodiment wherein two protecting sleeves 5a and 5b are separated in order to protect from cracks in separate position in a bore hole.
  • Each protecting sleeve is fastened to the tubular expandable bolt portion 2 by means of locking elements 7 on both sides. Expansion of rock bolt 1 in Fig. 10 will take place in three areas as indicated with numeral 18.
  • the invention can be modified within the scope of the annexed claims. Also other kinds of fluid expandable rock bolts can be used even if the one shown in the drawings is highly preferred.
  • the material of the protecting sleeves can be adapted to the expected loads and the material and the material thickness can be dimensioned accordingly.
  • the sleeve is made from a material from the group: metal, ceramic material, synthetic material.
  • the length of the protecting sleeves can be adapted to expected conditions in order for example to adapt to longer or shorter areas of expected loads. It is here referred to the above discussion about dimensioning and positioning the sleeves so as to allow energy absorbing sliding movements of the bolt inside the bolt hole.
  • Position 21 indicates arranging at least one protecting sleeve on an outside of the tubular expandable bolt portion.
  • Position 22 indicates displacing each protecting sleeve along the extension of the tubular expandable bolt portion and fastening it thereon in a chosen longitudinal position on the tubular expandable bolt portion corresponding to an expected rock movement zone.

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)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Abstract

La présente invention concerne un boulon de renfort pour roche (1) qui comporte : une partie de boulon extensible tubulaire (2) avec une section transversale fermée pour l'extension à l'intérieur d'un trou de forage (8), la partie de boulon extensible tubulaire (2) possédant une extension longitudinale, une partie de raccordement (3) pour le raccordement à une source de pression à une partie intérieure de la partie de boulon extensible tubulaire, et une partie de support (4, 13) pour le support contre une face de roche (12) dans la région d'une embouchure du trou de forage. Au moins un manchon de protection (5, 5a, 5b) est agencé sur une partie extérieure de la partie de boulon extensible tubulaire (2), et chaque manchon de protection (5, 5a, 5b) est déplaçable le long de l'extension de la partie de boulon extensible tubulaire (2) et est fixable sur celle-ci dans une position longitudinale choisie sur la partie de boulon extensible tubulaire. La présente invention concerne également un procédé pour installer un boulon de renfort pour roche (1) et un manchon de protection.
PCT/CA2012/050338 2012-05-22 2012-05-22 Boulon d'ancrage et procédé d'installation d'un boulon d'ancrage WO2013173901A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2872252A CA2872252C (fr) 2012-05-22 2012-05-22 Boulon d'ancrage et procede d'installation d'un boulon d'ancrage
SE1451381A SE540189C2 (en) 2012-05-22 2012-05-22 Rock bolt and method of installing the rock bolt and a protecting sleeve for it
PCT/CA2012/050338 WO2013173901A1 (fr) 2012-05-22 2012-05-22 Boulon d'ancrage et procédé d'installation d'un boulon d'ancrage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA2012/050338 WO2013173901A1 (fr) 2012-05-22 2012-05-22 Boulon d'ancrage et procédé d'installation d'un boulon d'ancrage

Publications (1)

Publication Number Publication Date
WO2013173901A1 true WO2013173901A1 (fr) 2013-11-28

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ID=49622955

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2012/050338 WO2013173901A1 (fr) 2012-05-22 2012-05-22 Boulon d'ancrage et procédé d'installation d'un boulon d'ancrage

Country Status (3)

Country Link
CA (1) CA2872252C (fr)
SE (1) SE540189C2 (fr)
WO (1) WO2013173901A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160168993A1 (en) * 2013-07-12 2016-06-16 Minova International Limited Yieldable rock anchor
WO2017187219A1 (fr) 2016-04-28 2017-11-02 Dsi Underground Ip Holdings Luxembourg Sarl Boulon d'ancrage extensible avec indicateur de serrage
EP3320179A4 (fr) * 2015-07-10 2019-03-13 Epiroc Canada Inc. Renfort de cisaillement et de traction pour boulon gonflable
CN111965254A (zh) * 2019-11-05 2020-11-20 中国葛洲坝集团第二工程有限公司 长外露锚杆无损检测方法
WO2023026204A1 (fr) * 2021-08-24 2023-03-02 Fci Holdings Delaware, Inc. Boulon d'ancrage dynamique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LT3188759T (lt) 2014-09-03 2020-07-10 Rhizen Pharmaceuticals S.A. Gydymo būdas ir kompozicijos, apimančios dvigubą p13k delta-gama kinazės inhibitorių ir kortikosteroidą
CN111911191A (zh) * 2020-07-15 2020-11-10 中国矿业大学 一种过泥化松散顶板巷道的控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459067A (en) * 1979-03-09 1984-07-10 Atlas Copco Aktiebolag Method of rock bolting and tube-formed expansion bolt
US4511289A (en) * 1981-10-19 1985-04-16 Atlas Copco Aktiebolag Method of rock bolting and rock bolt
WO2004016909A1 (fr) * 2002-08-19 2004-02-26 John Paul Mckelvey Boulon d'ancrage
WO2011087948A1 (fr) * 2010-01-14 2011-07-21 Anthony John Spencer Spearing Boulon expansible taraudeur
US20110299939A1 (en) * 2010-06-04 2011-12-08 Fci Holdings Delaware, Inc. Expandable Bolt With Shielded Tip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459067A (en) * 1979-03-09 1984-07-10 Atlas Copco Aktiebolag Method of rock bolting and tube-formed expansion bolt
US4511289A (en) * 1981-10-19 1985-04-16 Atlas Copco Aktiebolag Method of rock bolting and rock bolt
WO2004016909A1 (fr) * 2002-08-19 2004-02-26 John Paul Mckelvey Boulon d'ancrage
WO2011087948A1 (fr) * 2010-01-14 2011-07-21 Anthony John Spencer Spearing Boulon expansible taraudeur
US20110299939A1 (en) * 2010-06-04 2011-12-08 Fci Holdings Delaware, Inc. Expandable Bolt With Shielded Tip

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160168993A1 (en) * 2013-07-12 2016-06-16 Minova International Limited Yieldable rock anchor
US9677399B2 (en) * 2013-07-12 2017-06-13 Minova International Limited Yieldable rock anchor
EP3320179A4 (fr) * 2015-07-10 2019-03-13 Epiroc Canada Inc. Renfort de cisaillement et de traction pour boulon gonflable
WO2017187219A1 (fr) 2016-04-28 2017-11-02 Dsi Underground Ip Holdings Luxembourg Sarl Boulon d'ancrage extensible avec indicateur de serrage
CN111965254A (zh) * 2019-11-05 2020-11-20 中国葛洲坝集团第二工程有限公司 长外露锚杆无损检测方法
WO2023026204A1 (fr) * 2021-08-24 2023-03-02 Fci Holdings Delaware, Inc. Boulon d'ancrage dynamique

Also Published As

Publication number Publication date
CA2872252C (fr) 2019-06-18
SE1451381A1 (sv) 2014-11-18
SE540189C2 (en) 2018-04-24
CA2872252A1 (fr) 2013-11-28

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