WO2017201553A1 - Dispositif de fixation par pression - Google Patents

Dispositif de fixation par pression Download PDF

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Publication number
WO2017201553A1
WO2017201553A1 PCT/ZA2016/000018 ZA2016000018W WO2017201553A1 WO 2017201553 A1 WO2017201553 A1 WO 2017201553A1 ZA 2016000018 W ZA2016000018 W ZA 2016000018W WO 2017201553 A1 WO2017201553 A1 WO 2017201553A1
Authority
WO
WIPO (PCT)
Prior art keywords
push
locking device
anchor
faceplate
aperture
Prior art date
Application number
PCT/ZA2016/000018
Other languages
English (en)
Inventor
Rhys HERBERT
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
Publication of WO2017201553A1 publication Critical patent/WO2017201553A1/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
    • E21D21/0093—Accessories
    • 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

Definitions

  • the invention relates to a push-or locking mechanism that engages with a pre-mstalled rock anchor system to support post installation safety installations or utility cabling
  • a rock anchor array is installed inlo a rocx face by drilling holes into the rock face and installing, into each, an appropriately configured rock anchor.
  • the rook face is supported by a faceplate that is engaged wilhthe rock anchor and installed againsl tne rock face, kept in place by a nut or the like,
  • rock anchor includes a rock bolt or a cable anchor
  • the safety installation may be, for example, a mesh panel system wherein a plurality of mesh panels are installed against the rock face.
  • rock anchors may oe necessary, post installation of the rock anchors, to install utility cabling.
  • the washer is kept in place, and prevented from siding off, by the friction grip between a perimeter edge of the washer aperture and the outer surface of the rock anchor.
  • the problem is thai often this factional force is insufficient to keep the mesh washer in load support of the mesh.
  • the steei is too hard for the washer to grip into the material,
  • the invention provides a push-on locking device which includes a barrel which has a leading end and a traiiing end with a tapered passage which extends at least partially between the ends, a gripping means within the passage, a cylindrical aperture within the gripping means for receiving a rock anchor in use, a retaining formation in the passage between the gripping means and the trailing end which has a hole which is in register with the aperture, wherein a perimeter of the hole is adapted to frictionaiiy engage the rock anchor when the device is pushed onto the anchor from the leading end and wherein the gripping means is adapted to grip the rock anchor when the rock anchor moves relatively to the barrel.
  • the gripping means may include a plurality of wedge elements which are positioned in the passage in a circumferential array.
  • Each wedge element has an inner aperture facing surface and an outer facing surface which is obliquely angled to the inner surface.
  • each wedge element may be formed with ridges, teeth or threads.
  • the ridges or teeth may be angied towards the trailing end.
  • the thread may be complementary to the thread on a threaded end of 3 rock anchor.
  • the device may include a holding means for holding the wedge elements in the circumferential array within the passage.
  • the holding means may be a frame into which each of the wedge elements engage to hold them in the array.
  • the frame may include first and second spaced concentric ring members and a plurality of interlink elements which connect the ring members and between which arcuate windows are defined, each of which receives a respective wedge element.
  • the holding means may be a lug which is adapted to be inserted in the aperture to hold the wedge elements in the anay.
  • the lug may be inserted into the aperture from the trailing end of the barrel such that, when the device ss pushed onto the anchor from the leading end, the lug is pushed from the aperture at the trailing end.
  • the retaining formation may be a washer and the washer may include a plurality of teeth integrally formed around the perimeter of a hole of the washer, which teeth resiliently deform to accommodate passage of the rock anchor when the locking device is pushed onto the rock anchor end.
  • the teeth may be angled towards the trailing end.
  • the invention extends to a post installation support assembly which includes the push-on locking device described above, a faceplate and a faceplate seat which connects the locking device to the faceplate, which includes a body which is internally adapted to receive the locking device and which is externally adapted to engage with the faceplate about a central opening of the faceplate.
  • the body of the faceplate seat may be adapted with a passage through or in which the locking device is received.
  • the body may include at an abutment formation on an exterior surface of the body against which the faceplate engages about the central opening.
  • Figure 1 diagrammatically illustrates s rock anchor installation with a push-on fastener in accordance with the invention
  • Figure 2 is a view in perspective from below of the rock anchor installation of Figure 1 ;
  • Figure 3 is a view in perspective of the push-on fastener of Figure 1 ;
  • Figure 4 is a sectioned view in perspective of the push-on fastener of Figure 1 ;
  • Figure 5 is an exploded view of the push-on fastener of Figure 1 and an associated faceplate;
  • Figure 8 is an explodec view in perspective of a push-on fastener in accordance with a second embodiment of the invention.
  • Figure 7 is a sectioned view in perspective of the push-on fastener of Figure 6. DESCRIPTION OF PREFERRED EMBODIMENT
  • Figure 1 illustrates a rock anchor system which includes a rock anchor 10 having, in the case of a bolt, a rigid elongate boil body (not shown) or, in the case of s cable anchor, a flexible elongate cable body 12.
  • the rock anchor is a cable anchor.
  • the body 12 extends, in a rock hole 14 into which it is installed, between a first end 16 and a second projecting end 18.
  • the anchor 10 is secured within the hole by any suitable means, for example, with a mechanical anchor or grout
  • a first faceplate 20 is placed in bad support, on the anchor, against a rock face 22, secured in piace with a trailing barrel and wedge assembly 24.
  • the push-on fastener 40A includes a barrel-like body 42 which has a truncated conical shape, which body extends in the longitudinal direction between a leading end 44 and a trailing end 46. At the trailing end, the wail 47 of the body is lipped to create a laterally projecting skirl 48 (see Figure 4). A tapered passage 50 passes through the body between its ends.
  • a gripping assemblage 52 is iocated in the passage 50, With particular reference to Figure 5, the gripping assemblage comprises a frame 54 and a plurality of wedge elements respectively designed 56A, 588 and 58C,
  • the frame consists of a pair of concentric yet diametrically different rings, respectively designated 5SA and 58B, longitudinally spaaed and attached by means of obliquely angled interlinking members 59. Arcuate spaces are defined between the rings and the members in which a respective wedge element 56 is mounted,
  • Each wedge element 56 is arcuate in cross section and, in longitudinal section (as illustrated in Figure 4), in situ, tapers towards the leading end 44 of the fastener body 42 to complement the shape of the tapered passage 50 such that the inner walls 58 of the elements 66 define a cylindrical aperture 60.
  • the inner walls are formed with a plurality of circumferential ridges 61 , each of which is angled towards the trailing end 46.
  • a washer 62 is provided which has a hole 64, the perimeter of which is integrally formed with a plurality of teeth 66 (see Figure 5) that, like the ridges, are angled towards the trailing end.
  • a cap 68 is used to mount the washer 62 to the barrel 42.
  • the cap 68 is a disc of sheet metal that ts centrally holed an inner perimeter of which is turned up to define a lip 70. It is on a rim 72 of this lip that the washer 62 Is placed. The diameter of the rim 72 complements the diameter of a down turned edge 74 of the washer such that the washer friction fits onto the rim.
  • the skirt 48 of the barrel is placed on the cap 68 over the lip 70 to present the washer to the passage 50 with the hole 64 in register with the aperture 60.
  • an edge 76 of the cap is turned up and in to crimp the skirt 48 within the overturned portion.
  • the washer Along with its principle function of providing a means to attach the fastener 40A to the anchor 10, the washer also functions as a base upon which the gripping assemblage 52 rests.
  • the leading end 46 of the push-on fastener 40 is presented to the second end 18 and positioned to receive the anchor body 12 through the cylindrical aperture 60.
  • the fastener 40A is pushed along the anchor body until it abuts the faceplate 36 Passage of the anchor body through the aperture 80 is not resisted as the ridges 61 of the elements 56 and the teeth 68 of the washer 62 are angled towards the trailing end 46 of the fastener. Also enough circumferential clearance is provided between the aperture and the anchor body.
  • the hole 84 of the washer is slightly smaller in circumference to the aperture and thus there is resistive ratcheted passage of the anchor body through the hole, with the teeth resiliency outwardly biasing to accommodate this passage.
  • the faceplate has a deep dome 78 leading to central mouth 80, the circumference of which is such that it allows a leading end 44 portion of the fastener to penetrate the dome 78 through the mouth.
  • a load seat 84 is provided which is received over the fastener 40 to rest upon the overturned portion of the cap 68 before it is engaged with the rock anchor 10.
  • the invention extends to a second embodiment of the push-on fastener 408 which is illustrated in Figure 8 and 7.
  • the connector 84 which has a tubular body 92 extending between opposed first and second ends, respectively designated 94 and 96.
  • the body defines a passageway 98 extending between the ends.
  • the passageway 98 is divided between a narrow section 100 which opens on the second end 96 and a wider section 102 which opens on the first end 94.
  • the sections are separated by a step 103.
  • the narrow section 100 is complementary sized to receive, in friction fit, the fastener 40B.
  • An outer surface 105 of the body S2 is circumferentially ridged with a load seat 104.
  • the ridging of the load seat is comprised of the coming together of an under and upper sloping surface, respectively designated 106 and 108,
  • the outer surface is recessed to provide a locating collar 1 10.
  • the faceplate 36 is engaged with the connector 84, with the mouth 80 of the faceplate received over a lip 1 12 of the first end 94 into the locating collar 110 in snap lock engagement.
  • the edge 86 of the mouth now abuts against the upper sloping surface 108 of the load seat 104.
  • the assembly 90 can be engaged with the second end 18 of the body 12 of a pre-installed rock anchor 10 as a unitary whole with the wider section 102 of the passageway 98 of the connector 64 leading.
  • the gripping assemblage has a higher load bearing capacity to the washer 62 which is the functional component that provides initial attachment of the fastener (40A and 40B) to the anchor 10. If there is movement in the rock face 22, the forces are such that in the absence of the gripping assemblage, the grip of the washer on the anchor would fail and the fastener would come off the anchor, leaving the mesh 30 unsupported at this locality. However, the movement of the rock face has the effect of actuating the wedge etements 58 to pivotally move radially Inwardly to grip the anchor along the length of each element, aided by the ridges 81.

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)
  • Dowels (AREA)

Abstract

L'invention concerne un dispositif de verrouillage par pression qui comprend: un cylindre présentant une extrémité avant et une extrémité arrière entre lesquelles un passage conique s'étend au moins partiellement; un moyen de préhension logé dans le passage; une ouverture cylindrique ménagée à l'intérieur du moyen de préhension pour recevoir une ancre pour la roche en cours d'utilisation; une formation de retenue ménagée dans le passage entre le moyen de préhension et l'extrémité arrière et comportant un trou aligné sur l'ouverture. Un périmètre du trou est adapté pour venir en contact de frottement avec l'ancre pour la roche lorsque le dispositif est pressé contre celle-ci à partir de l'extrémité avant. Le moyen de préhension est adapté pour saisir l'ancre pour la roche lorsque celle-ci se déplace par rapport au cylindre.
PCT/ZA2016/000018 2016-05-16 2016-07-28 Dispositif de fixation par pression WO2017201553A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201603291 2016-05-16
ZA2016/03291 2016-05-16

Publications (1)

Publication Number Publication Date
WO2017201553A1 true WO2017201553A1 (fr) 2017-11-23

Family

ID=58537099

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2016/000018 WO2017201553A1 (fr) 2016-05-16 2016-07-28 Dispositif de fixation par pression

Country Status (1)

Country Link
WO (1) WO2017201553A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2290119A (en) * 1994-06-07 1995-12-13 Jennmar Corp Flexible rock bolt
US5525013A (en) * 1994-10-31 1996-06-11 Seegmiller; Ben L. Cable bolt structure and related components
WO2010019971A1 (fr) * 2008-08-11 2010-02-18 Sandvik Mining And Construction Rsa (Pty) Ltd Câble d'ancre pour la roche

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2290119A (en) * 1994-06-07 1995-12-13 Jennmar Corp Flexible rock bolt
US5525013A (en) * 1994-10-31 1996-06-11 Seegmiller; Ben L. Cable bolt structure and related components
WO2010019971A1 (fr) * 2008-08-11 2010-02-18 Sandvik Mining And Construction Rsa (Pty) Ltd Câble d'ancre pour la roche

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