EP0749518A1 - Boulon d'ancrage - Google Patents

Boulon d'ancrage

Info

Publication number
EP0749518A1
EP0749518A1 EP95912974A EP95912974A EP0749518A1 EP 0749518 A1 EP0749518 A1 EP 0749518A1 EP 95912974 A EP95912974 A EP 95912974A EP 95912974 A EP95912974 A EP 95912974A EP 0749518 A1 EP0749518 A1 EP 0749518A1
Authority
EP
European Patent Office
Prior art keywords
rock bolt
diameter
shaft
collar
tapered surface
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Withdrawn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
EP95912974A
Other languages
German (de)
English (en)
Other versions
EP0749518A4 (fr
Inventor
Ghassan Skybey
Brian Mccowan
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.)
Newcastle Wallsend Coal Co Pty Ltd
Nutrition and Biosciences Australia Pty Ltd
Original Assignee
DuPont Australia Ltd
Newcastle Wallsend Coal Co 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 AUPM4737A external-priority patent/AUPM473794A0/en
Application filed by DuPont Australia Ltd, Newcastle Wallsend Coal Co Pty Ltd filed Critical DuPont Australia Ltd
Publication of EP0749518A1 publication Critical patent/EP0749518A1/fr
Publication of EP0749518A4 publication Critical patent/EP0749518A4/fr
Withdrawn legal-status Critical Current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

Definitions

  • This invention relates to a rock bolt or roof anchor, in particular to a rock bolt or roof anchor for use in an underground mine, or other tunnel.
  • the invention also relates to a method of reinforcing a wall or ceiling in an underground mine or tunnel.
  • the invention relates to a dowel, for example, a Rima® dowel 1 , or coal rib anchor for use in a coal mine.
  • a rock bolt comprising: a shaft having one end threaded to receive a nut, the other end being provided with a plurality of surfaces, each surface extending angularly about and longitudinally of the longitudinal axis of the shaft, and converging with respect to the axis toward the one end; and a plurality of collars, each collar being associated with a respective one of the surfaces and co-operating therewith so that upon relative movement of each collar with respect to its associated surface toward the other end, each collar is caused to radially expand so as to project radially beyond its associated surface.
  • a method of reinforcing a wall or ceiling in an underground mine or tunnel comprising: inserting into a hole drilled in said wall or ceiling, one end of a rock bolt having a plurality of surfaces, which surfaces extend angularly about and longitudinally of the longitudinal axis of said rock bolt, and converge with respect to the axis toward said end; and screwing a nut onto the other end of said rock bolt which is threaded so that a plurality of collars which are associated with each one of said surfaces and co-
  • a rock bolt comprising: a shaft having one end threaded to receive a nut, the other end being provided with at least one surface, said surface extending angularly about and longitudinally of the longitudinal axis of the shaft, and converging with respect to the axis toward the one end; and at least one collar, said collar being associated with said surface and co- operating therewith so that upon relative movement of said collar with respect to its associated surface toward the other end, said collar is caused to radially expand so as to project radially beyond its associated surface.
  • a method of reinforcing a wall or ceiling in an underground mine or tunnel comprising: inserting into a hole drilled in said wall or ceiling, one end of a rock bolt having at least one surface, which surface extends angularly about and longitudinally of the longitudinal axis of said rock bolt, and converge with respect to the axis toward said end; and screwing a nut onto the other end of said rock bolt which is threaded so that at least one collar which is associated with said surface and co-operates therewith is caused to radially expand so as to project radially beyond its associated surface to hold said rock bolt in position.
  • a preferred form of the rock bolt of the present invention is one wherein the shaft has a main elongated body and the surface(s) is provided by a frusto-conical portion(s) moulded integral with the body.
  • each of the collars is a split ring. These rings will close up upon insertion into the hole clamping the rock bolt and stopping it from rotation after installation.
  • rock bolt of the present invention is one which has at least one wing which allows the rotation of the rock bolt in one direction only.
  • the shaft of the rock bolt is elongated and is moulded from plastics material or machined from metal.
  • the threaded end may also be moulded from plastics material and moulded to the shaft.
  • the plurality of surfaces and collars are also usually moulded from plastics material or may be machined from metal.
  • the plurality of surfaces is usually moulded in the form of between one and three tapered surfaces which converge toward the threaded end of the shaft.
  • the length of the tapered surface or the combination of tapered surfaces is approximately 50 to 230mm, preferably each tapered surface is 50 to 80mm, most preferably 60 to 75mm in length.
  • the tapered surfaces have a diameter which varies from 10 to 40mm, preferably 10 to 30mm, more preferably the diameter varies from 19 to 40mm, most preferably the diameter varies from 19 to 26mm. In coal mining applications the dimensions of the tapered surfaces is important.
  • the collars may be shaped as frusto-conical, square, hexagonal or any other shape.
  • the collars are typically shaped as frusto-conical split rings.
  • the split rings are tapered so that the split rings converge toward the threaded end of the shaft.
  • the diameter of the split ring varies from 20 to 40mm, preferably from 26 to 36mm, most preferably 26 to 32mm.
  • the rock bolt of the present invention may further optionally comprise at least one wing which is attached to the shaft by any suitable means.
  • the wing may be integrally formed with the shaft. If two wings are present, they are arranged so that they are diagonally opposite each other. A great number of wings may be integrally formed with the shaft or attached thereto and the wings would be equally spaced apart.
  • the wings are shaped and angled to allow rotation of the rock bolt in one direction only.
  • An example of one shape of the wing is one that is a blade-like shape, extending substantially tangentially from the shaft, that is a flat structure having two straight edges meeting at one point. Other variations of this shape are possible.
  • the rock bolt of the present invention may also comprise a series of longitudinal ribs on the tapered surfaces.
  • the length of the longitudinal ribs would vary depending on the length of the tapered surfaces. Typically the longitudinal ribs would be approximately 60 to 75mm in length.
  • the longitudinal ribs would be preferably spaced apart equally around the outer surface of the tapered surfaces.
  • the rock bolt may be ultimately ground up by a mining machine.
  • the rock bolt is made up of fibre glass material to be cut up by mining machinery.
  • Figure 1 is a perspective view of the rock bolt having tapered surfaces with split rings
  • Figure la is a cross sectional view along the line la-la of Figure 1 showing a split collar on the taper;
  • Figure 2 is a cross sectional side elevation of the rock bolt having tapered surfaces with split rings;
  • Figure 3 is a an end view of the rock bolt illustrating a pair of wings.
  • rock bolt 1 of the present invention is illustrated in Figure 1 as comprising a shaft 2, a plurality of surfaces 3, 3a, 3b and a plurality of collars 4, 4a, 4b.
  • the shaft 2 is an elongated shaft moulded from plastic. End 5 of shaft 2 is threaded to receive a nut which is not illustrated. The thread may extend a short distance from end 5 or throughout the entire length of the shaft 2.
  • a plurality of surfaces 3, -3a, 3b is located close to other end 6 of shaft 2.
  • the plurality of surfaces 3, 3a, 3b is illustrated in Figures 1 and 2 as three tapered surfaces.
  • Each tapered surface 3, 3a, 3b is shown as converging toward threaded end 5.
  • Each tapered surface 3, 3a, 3b is shown as a frusto-conical surface.
  • Tapered surface 3b further comprises a flanged end 7 which is integrally moulded with tapered surface 3b. Flanged end 7 acts as a barrier for collar 4b so that collar 4b does not slip toward threaded end 5.
  • the plurality of collars 4, 4a, 4b are shown in Figures 1 and la as split rings.
  • Split rings 4, 4a, 4b are frusto-conical which converge toward end 6.
  • Split rings 4, 4a, 4b are relatively freely movable along respective surfaces 3, 3a, 3b.
  • FIG. 3 is a top plan view of end 6.
  • Flanged end 7 is shown as having a pair of wings 8, 8a which are integrally formed with flanged end 7.
  • a hole is drilled in a roof of a mine or coal rib. End 6 is inserted into the hole. A plate is placed around the rock bolt 1 and a nut is screwed onto threaded end 5. As the nut screws onto threaded end 5, the rock bolt 1 is tensioned. This causes the split rings 4, 4a, 4b to slide toward end 6. As split rings 4, 4a, 4b slide, they expand radially, thereby pushing against the walls of the hole. In this way, the split rings 4, 4a, 4b project radially beyond tapered surfaces 3, 3a, 3b to hold the rock bolt in position.
  • the rock bolt 1 of the present invention has a pair of wings 8, 8a integrally formed thereon, the wings 8, 8a are arranged in a direction which is opposite that of threaded end 5. So when a nut is screwed onto threaded end 5, the wings 8, 8a act as an anti-rotating device by gripping to the walls of the hole. Thus the rock bolt 1 is prevented from turning as the nut is being screwed onto threaded end 5.
  • a rock bolt of the invention can be readily utilised in the mining industry, especially in the coal mining industry.

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)
  • Connection Of Plates (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

La présente invention a pour objet un boulon d'ancrage (1) conçu pour être utilisé notamment dans une mine souterraine ou dans un tunnel. L'invention porte aussi sur une méthode de renforcement d'un mur ou d'un plafond dans une mine souterraine ou un tunnel. En particulier, l'invention concerne une cheville, par exemple, une cheville Rima ® ou boulon d'ancrage pour veines de charbon. Dans l'une des réalisations, le boulon (1) comprend: un arbre (2) ayant une extrémité (5) filetée destinée à recevoir un écrou, l'autre extrémité (6) présentant plusieurs surfaces (3, 3a, 3b) dont chacune s'étend angulairement et longitudinalement dans le sens de l'axe longitudinal de l'arbre (2) et converge par rapport à l'axe vers la première extrémité (5); et une pluralité de colliers (4, 4a, 4b), associés chacun (4, 4a, 4b) à l'une des surfaces (3, 3a, 3b) et coopérant avec ladite surface de telle manière qu'en cas de mouvement relatif de chaque collier (4, 4a, 4b) par rapport à sa surface associée (3, 3a, 3b) en direction de l'autre extrémité, chaque collier (4, 4a, 4b) s'étend radialement jusqu'à se projeter radialement au-delà de sa surface associée (3, 3a, 3b).
EP95912974A 1994-03-25 1995-03-24 Boulon d'ancrage Withdrawn EP0749518A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AUPM4737/94 1994-03-25
AUPM4737A AUPM473794A0 (en) 1994-03-25 1994-03-25 A rock bolt
ZA9408688 1994-11-03
ZA948688A ZA948688B (en) 1994-03-25 1994-11-03 A rock bolt
PCT/AU1995/000167 WO1995026457A1 (fr) 1994-03-25 1995-03-24 Boulon d'ancrage

Publications (2)

Publication Number Publication Date
EP0749518A1 true EP0749518A1 (fr) 1996-12-27
EP0749518A4 EP0749518A4 (fr) 1999-10-13

Family

ID=25644650

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95912974A Withdrawn EP0749518A4 (fr) 1994-03-25 1995-03-24 Boulon d'ancrage

Country Status (4)

Country Link
EP (1) EP0749518A4 (fr)
CN (1) CN1144550A (fr)
CA (1) CA2184586A1 (fr)
WO (1) WO1995026457A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK200000241Y6 (da) * 2000-07-28 2001-09-14 Erling Moerch Befæstigelsesindretning
CA2566986C (fr) 2006-11-02 2015-01-06 Jonathan Jonny Melic Ancre pour beton
DE102011083153A1 (de) 2011-09-21 2013-03-21 Hilti Aktiengesellschaft Ankerstange
CA2961933A1 (fr) * 2014-09-23 2016-03-31 Ncm Innovations (Pty) Ltd Boulon d'ancrage dote d'un systeme de coin integre et son procede de fabrication
AU2021308726A1 (en) * 2020-07-14 2023-02-23 Rattlejack Innovations Pty Ltd "a safety plug"

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2733007C2 (de) * 1977-07-21 1987-03-19 Hilti Ag, Schaan Klebeanker
SU696160A1 (ru) * 1978-04-18 1979-11-05 Всесоюзный научно-исследовательский институт золота и редких металлов Анкер
NO159678C (no) * 1982-05-14 1989-01-25 Weidmann H Ag Fjellsikringsanker.
SU1065616A1 (ru) * 1982-08-25 1984-01-07 Всесоюзный научно-исследовательский институт золота и редких металлов Анкер
DE3525244A1 (de) * 1985-07-15 1987-01-15 Hilti Ag Spreizanker

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9526457A1 *

Also Published As

Publication number Publication date
EP0749518A4 (fr) 1999-10-13
CA2184586A1 (fr) 1995-10-05
CN1144550A (zh) 1997-03-05
WO1995026457A1 (fr) 1995-10-05

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