WO2009150617A1 - Dispositif d’ancrage - Google Patents

Dispositif d’ancrage Download PDF

Info

Publication number
WO2009150617A1
WO2009150617A1 PCT/IB2009/052465 IB2009052465W WO2009150617A1 WO 2009150617 A1 WO2009150617 A1 WO 2009150617A1 IB 2009052465 W IB2009052465 W IB 2009052465W WO 2009150617 A1 WO2009150617 A1 WO 2009150617A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular body
anchoring device
retaining member
protrusions
tensioned position
Prior art date
Application number
PCT/IB2009/052465
Other languages
English (en)
Inventor
Paul Eksteen
Original Assignee
Bent It Over Marketing Cc
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 Bent It Over Marketing Cc filed Critical Bent It Over Marketing Cc
Publication of WO2009150617A1 publication Critical patent/WO2009150617A1/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
    • E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means

Definitions

  • THIS invention relates to an anchoring device, and more particularly but not exclusively, to an anchoring device suitable for use in mining and excavation applications.
  • Anchoring devices generally known as anchor bolts or rock bolts in the industry, are ubiquitous in mining and excavation applications, and are used for stabilizing a rock mass where excavation or mining has taken or is taking place.
  • the anchor bolts assist in transferring loads from unstable surface zones to more stable interior zones of a rock body in question.
  • anchor bolts are used in industry, and the anchor bolt designs vary from simple to very complex designs.
  • split sets are generally rock bolts that comprise of an elongate high strength steel tube which is slotted along its length.
  • One end of the tube is of a slightly tapered configuration for easy insertion into a drill hole, whilst the other end may include a welded ring-flange for holding a bearing plate.
  • the slotted tube is driven into a slightly smaller hole, by applying an insertion force with a hammer drill, which is typically the same drill used to drill the hole.
  • a hammer drill which is typically the same drill used to drill the hole.
  • outer surfaces of the tube engages an inner surface of the hole, which causes the slot and thus the tube, to be compressed.
  • the tube therefore exerts an opposing radially outwardly directed force onto the walls of the hole, thus resulting in secure engagement between the tube and the hole.
  • a number of disadvantages are however associated with a standard split set as is known in the trade. These types of anchoring devices generally have to be installed at unstable parts of tunnels or stopes. The installation of a split set is however an unstable process, which is associated with a lot of force and vibration and is therefore a high risk activity, especially if performed in an already unstable zone. In addition, if the connection between the tube and the hole is insufficient, structural damage may occur which may result in crumbling of the rock mass.
  • a still further disadvantage is that there are often serious space constraints in stopes where these types of anchoring devices are to be installed, and it is therefore not always easy and/or possible to install the split sets using a standard hammer drill.
  • an anchoring device suitable for being installed inside a drilled hole, the anchoring device including:
  • the tubular body being displaceable between a tensioned position and a relaxed position, with a diameter of the tube being smaller in the tensioned position than in the relaxed position, the tubular body being biased towards the relaxed position;
  • a retaining member for releasably retaining the tubular body in the tensioned position, the retaining member being selectively releasable to allow the tubular body to be displaced towards the relaxed position.
  • tensioning protrusions to extend from the tubular body at zones adjacent the longitudinal slot in the tubular body, wherein the tubular body is displaced to the tensioned position when opposing tensioning protrusions are displaced towards one another.
  • tensioning protrusions extend radially inwardly into the tubular body.
  • the retaining member is provided for the retaining member to be adapted to engage the tensioning protrusions in order to retain the tubular body in the tensioned position.
  • the retaining member is preferably in the form of an at least partially channel-like structure, wherein the tensioning protrusion are retainable inside the channel in order to keep the tubular body in a tensioned position.
  • the retaining member may be at least partially displaceable relative to the tubular body so as to, in use, allow the tensioning protrusions to disengage from the channel, so as to allow the tubular body to be displaced towards the relaxed position.
  • the retaining member prefferably in the form of a channel having castellated side walls, so as to provide for the tensioning protrusions to be displaceable through gaps provided in the sidewalls of the channel without having to remove the entire retaining member.
  • a further feature of the invention provides for gripping protrusions to extend at least partially radially outwardly from the tubular body, for enhancing engagement between the tubular body and the hole in which the anchoring device is installed.
  • a method of installing an anchoring device including the steps of: providing an anchoring device as described above;
  • the method includes the further steps of:
  • Figure 1 is a perspective view of the anchoring device in accordance with an embodiment of the invention, the tubular body being in a tensioned position;
  • Figure 2 shows the tubular body of the anchoring device of Figure 1 in a relaxed, and thus expanded, position, with the retaining member having been removed from the tubular body entirely;
  • Figure 3 is a cross-sectional end view of the anchoring device of Figure 1 installed in a drilled hole
  • Figure 4 is the cross-sectional side view of Figure 1 wherein the retaining member has been removed, so as to allow the tubular body to be displaced to the relaxed position.
  • the anchoring device 10 can also be referred to as a friction anchor.
  • the anchoring device 10 comprises a tubular body 20 and a retaining member 30 being locatable inside the tubular body 20 for reasons which will become apparent herein below.
  • the tubular body 20 is made from a suitable resilient material, such as high strength spring steel, and is of elongate configuration.
  • the tubular body 20 is also at least partially tapered in order to facilitate easy insertion of the tubular body 20, and thus the anchoring device 10, into a hole 16 drilled in a rock mass 15.
  • the tubular body 20 is longitudinally parted by way of a longitudinal slot 22.
  • the provision of the slot 22 provides for the tubular body 20 to be displaceable between a tensioned position (shown in Figures 1 and 3) and a relaxed position ( Figures 2 and 4), with the diameter of the tubular body 20 being smaller in the tensioned position than in the relaxed position.
  • a first end 23 of the tubular body 20 terminates in a tapered section, whereas a second end 24 of a tubular body 20 terminates in a support ring 25, suitable for in use supporting a bearing plate (not shown), as is well known in the art in question.
  • Tensioning protrusions 26 extend from an inner surface of the tubular body 20 radially inwardly into the tubular body.
  • the tensioning protrusions 26 are intermitted and spaced apart, and are located on zones of the tubular body 20 adjacent the longitudinal gap 22. There is provided for each protrusion 26 on one side of the gap 22 to have an opposing protrusion on the other side of the gap. The opposing protrusions 26 can now be displaced towards one another in order to displace the tubular body 20 to the tensioned position (seen in figures 1 and 3).
  • the gaps 27 between the tensioning protrusions 26 are important in order to facilitate actuating of the anchoring device 10 as is described below.
  • the retaining member 30 comprises an elongate body 31 from which a plurality of complementary protrusions 33 stand proud in order to form a retaining channel 32.
  • the retaining channel 32 is also intermittent due to the protrusions 33 being spaced apart, the channel therefore having castellated side walls. Gaps 34 are therefore provided between adjacent complementary protrusions 33.
  • An actuating means in this embodiment in the form of an eye 35, are provided towards an end of the retaining member 30, and allows for the retaining member 30 to be rotated and/or longitudinally displaced in order to actuate the anchoring device 10 through the retaining member releasing the tensioning protrusions 26.
  • the tubular body 20 In use the tubular body 20, once manufactured, is compressed towards the tensioned position against its natural bias. Once so compressed, the retaining member 30 is inserted into the tubular body 20 and is positioned so that the retaining channel 32 formed by the protrusions 33 retains the tensioning protrusions 26 extending from the tubular body 20 therein. In this condition the tubular body 20 will now have a smaller diameter than a drilled hole 16 into which it is to be secured.
  • the anchoring device 10 can now be installed into a drilled hole 16 with substantially no frictional resistance, and no external equipment such as a hammer drill is therefore required.
  • the retaining member 30 may be partially removed until the tensioning protrusions 26 are allowed to be displaced through the gaps 34 formed in the retaining member 30. This will result in the tubular body 20 being displaced towards the expanded position (as is seen in Figure 4) and for an outer surface of the tubular body 20 therefore securely to engage an inner surface of the drilled hole 16.
  • additional protrusions may extend outwardly from the tubular body 20, which additional protrusions will further assist engagement between the tubular body 20 and the drilled hole 16.
  • the protrusions may for example be in the form of gang-nails. These additional protrusions can be provided due to the fact that the diameter of the tubular body 20 is substantially smaller than the drilled hole 16 when the anchoring device 10 is installed, and such additional protrusions therefore does not constitute an additional frictional surface upon inserting the anchoring device 10 into the drilled hole 16.
  • the inventor is of the opinion that the above anchoring device will alleviate the problems associated with the prior art, in that installation will be easy without requiring any special tooling or apparatus, and installation will also be a safe and quick process.
  • the retaining member may take many different forms, provided that it can be displaced between a first position wherein it retains the tubular body in a tensioned position and a second position in which it allows the tubular body to be displaced, under its natural bias, towards an expanded position.
  • This functionality may be achieved by many different actions and it is foreseen that the retaining member may be rotated, twisted or completely pulled out, or any of the aforegoing in combination.

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

La présente invention concerne un dispositif d’ancrage (10), et plus particulièrement, mais non exclusivement, un dispositif d’ancrage approprié pour être utilisé dans des applications d’exploitation minière et d’excavation. Le dispositif d’ancrage comprend un corps tubulaire (20) qui comporte une fente longitudinale (22) prévue dans ledit corps. Le corps tubulaire est déplaçable entre une position tendue et une position relâchée, un diamètre du tube étant plus petit dans la position tendue que dans la position relâchée, le corps tubulaire étant en outre sollicité vers la position relâchée. Un élément de retenue (30) est prévu pour retenir de façon libérable le corps tubulaire (20) dans la position tendue, l’élément de retenue pouvant être relâché sélectivement pour permettre au corps tubulaire d’être déplacé vers la position relâchée.
PCT/IB2009/052465 2008-06-12 2009-06-10 Dispositif d’ancrage WO2009150617A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200805145 2008-06-12
ZA2008/05145 2008-06-12

Publications (1)

Publication Number Publication Date
WO2009150617A1 true WO2009150617A1 (fr) 2009-12-17

Family

ID=41078194

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/052465 WO2009150617A1 (fr) 2008-06-12 2009-06-10 Dispositif d’ancrage

Country Status (1)

Country Link
WO (1) WO2009150617A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015013740A1 (fr) * 2013-07-29 2015-02-05 Gazmick Pty Ltd Boulon d'ancrage cimenté à friction

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098087A (en) * 1976-12-02 1978-07-04 Battelle Development Corporation Anchoring bolt and method
GB2006905A (en) * 1977-10-03 1979-05-10 Atlas Copco Ab Roof Bolt
US4314778A (en) * 1979-11-19 1982-02-09 Ingersoll-Rand Co. Friction rock stabilizer and method for inserting thereof in an earth structure bore
US4350462A (en) * 1980-03-28 1982-09-21 Elders G W Roof support pin
DE8234846U1 (de) * 1982-12-11 1983-05-11 Ruhrkohle Ag, 4300 Essen Gebirgsanker
US4673321A (en) * 1985-02-27 1987-06-16 Hilti Aktiengesellschaft Expansion dowel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098087A (en) * 1976-12-02 1978-07-04 Battelle Development Corporation Anchoring bolt and method
GB2006905A (en) * 1977-10-03 1979-05-10 Atlas Copco Ab Roof Bolt
US4314778A (en) * 1979-11-19 1982-02-09 Ingersoll-Rand Co. Friction rock stabilizer and method for inserting thereof in an earth structure bore
US4350462A (en) * 1980-03-28 1982-09-21 Elders G W Roof support pin
DE8234846U1 (de) * 1982-12-11 1983-05-11 Ruhrkohle Ag, 4300 Essen Gebirgsanker
US4673321A (en) * 1985-02-27 1987-06-16 Hilti Aktiengesellschaft Expansion dowel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015013740A1 (fr) * 2013-07-29 2015-02-05 Gazmick Pty Ltd Boulon d'ancrage cimenté à friction

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