EP0361690A1 - Ecrou portant pour assemblage de boulon d'ancrage - Google Patents

Ecrou portant pour assemblage de boulon d'ancrage Download PDF

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Publication number
EP0361690A1
EP0361690A1 EP89308771A EP89308771A EP0361690A1 EP 0361690 A1 EP0361690 A1 EP 0361690A1 EP 89308771 A EP89308771 A EP 89308771A EP 89308771 A EP89308771 A EP 89308771A EP 0361690 A1 EP0361690 A1 EP 0361690A1
Authority
EP
European Patent Office
Prior art keywords
bolt
mine roof
expansion
support nut
annular collar
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Withdrawn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
EP89308771A
Other languages
German (de)
English (en)
Inventor
Paul Yacisin
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.)
Jennmar Corp
Original Assignee
Jennmar Corp
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 Jennmar Corp filed Critical Jennmar Corp
Publication of EP0361690A1 publication Critical patent/EP0361690A1/fr
Withdrawn legal-status Critical Current

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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 mine roof anchors and particularly to a mine roof anchor assembly for small diameter bore holes which utilizes a supporting nut having desirable characteristics for the purpose.
  • U.S. Patent No. 4,413,930, U.S. Patent No. 4,419,805, U.S. Patent No. 4,516,885 and U.S. Patent No. 4,518,292 disclose examples of mine roof anchors which utilize both a mechanical expansion shell and resin bonding material to anchor the roof bolt within the rock strata.
  • U.S. Patent No. 3,941,028 shows a sheet metal support nut which clamps to the annular collar of an expansion shell.
  • Other mechanical anchor assemblies which do not utilize support nuts at all are disclosed in U.S. Patent No. 3,385,155 and U.S. Patent No. 4,278,006.
  • a mine roof anchor assembly that includes a bolt having a threaded end portion.
  • a tapered plug that has a threaded opening extending axially through it is threadingly received on the bolt threaded end portion.
  • a hollow expansion shell is provided to surround the bolt.
  • the hollow expansion shell has an annular collar at one end and a plurality of expansion fingers extending integrally from the collar in an axially direction.
  • the expansion shell cooperates with the tapered plug whereby axial movement of the plug toward the annular collar flexes the expansion fingers radially outwardly from the bolt and into contact with the wall of the bore hole into which the anchor assembly is placed.
  • a support nut is threaded onto the bolt threaded end portion and abuts the expansion shell annular collar.
  • the support nut has at least four complete internal threads and also has a maximum outside dimension that is less than the outside diameter of the shell annular collar.
  • a mine roof anchor assembly for anchoring a mine roof bolt in a blind bore hole formed in the mine roof.
  • the mine roof anchor assembly includes a destructible capsule containing resin bonding material components in an unmixed condition in separate destructible compartments within the capsule.
  • the capsule is positioned within the bore hole against the blind end of the bore hole.
  • a bolt having a threaded end portion is provided.
  • a tapered plug that has a large end and a small end and a threaded opening extending axially through it threadingly receives the bolt threaded end portion.
  • the tapered plug has a shear pin that extends diametrically across the threaded opening closer to the large end of the plug than to the small end. The bolt threaded end portion abuts the shear pin when the bolt is threaded into the plug small end.
  • a hollow expansion shell surrounding the bolt and having an annular collar at one end and a plurality of ex­pansion fingers extending integrally from the collar in an axial direction cooperates with the tapered plug, whereby axial movement of the plug toward the annular collar flexes the expansion fingers radially outwardly into contact with the wall of the bore hole when the bolt is positioned within the bore hole.
  • a support nut is threaded onto the bolt threaded end portion and abuts the expansion shell annular collar.
  • the support nut has at least four complete internal threads and has a maximum outside dimension that is less that the outside diameter of the shell annular collar.
  • the bolt, the tapered plug, the expansion shell and the support nut are moved axially as a unit to rupture the destructible capsule and thereafter they are rotated as a unit to mix the resin bonding material components.
  • the resistance of the mixed resin bonding material to rotation of the expansion shell causes the shear pin to break, the bolt rotates relative to the tapered plug and causes the expansion shell to expand.
  • the mixed resin is able to flow downwardly in the blind bore hole beyond the expansion anchor without being impeded by the support nut.
  • the principal object of the present invention is to provide a mine roof anchor assembly having a support nut that can be utilized in a relatively small diameter bore hole which is strong enough to support the expansion shell assembly and which does not extend radially outwardly beyond the annular collar of the expansion shell assembly.
  • Another object of the present invention is to provide a support nut for a mechanical expansion shell which permits resin to flow down beyond the support nut without being impeded when the mechanical shell is utilized with resin bonding material to anchor it in the bore hole.
  • FIG. 1 there is shown a mine roof anchor assembly 10 positioned within a blind bore 12 formed within the rock strata 14 above a mine roof.
  • a destructible resin capsule 16 is positioned against the end of the blind bore as shown in Figure 1.
  • a mine roof bolt 18 having a threaded end portion 20 is threaded into a tapered plug 22.
  • the tapered plug 22 has a shear pin 24 which extends diametrically across the threaded bore within tapered plug 22.
  • the roof bolt 18 is threaded into tapered plug 22 from the small end of tapered plug 22 until it abuts the shear pin 24.
  • the shear pin 24 is closer to the large end of tapered plug 22 than it is to the small end of tapered plug 22.
  • An expansion shell 26 having an annular collar 28 surrounds the bolt 18.
  • the expansion shell 26 has expansion fingers 30 which are formed integrally with the annular collar 28 and which extend in an axially direction upwardly from collar 28 as viewed in Figures 1 and 2.
  • expansion fingers 30 cooperate with the external surface of tapered plug 22 so that when tapered plug 22 is threaded onto bolt 18 toward the annular collar 28, the surface of tapered plug 22 forces the expansion fingers 30 radially outwardly and into contact with the wall of the blind bore 12 as shown in Figure 2.
  • a support nut 32 is threaded onto bolt 18 to support the expansion shell 26.
  • the support nut 32 has a cylindrical outer surface 34 and internal threads 36.
  • the outer diameter of the cylindrical outer surface 34 of support nut 32 is substantially smaller than the outer diameter of annular collar 28 on ex­pansion shell 26.
  • a conventional nut 38 is shown in Figure 4 for comparison purposes.
  • the conventional nut 38 is of hexagonal configuration and it may readily be seen that if such a nut were threaded onto bolt 18 to support expansion shell 26, at least the portions of the exterior surface where the flat surfaces join each other would extend radially outwardly beyond the annular collar 28.
  • the support nut 32 is first threaded onto the bolt threaded end portion 20.
  • the expansion shell 26 is then placed over the bolt and contacts the support nut 32.
  • the tapered plug 22 is then threaded onto threaded end portion 20 of bolt 18 until the shear pin 24 engages the end of bolt 18.
  • the destructible resin capsule 16 is placed within the bore hole 12 and then the bolt 18 with the expansion shell assembly on the end of it is placed into the bore hole.
  • the bolt 18 and the expansion shell assembly comprising tapered plug 22, expansion shell 26 and support nut 32 are moved as a unit upwardly into the bore hole 12 until they contact and then rupture the destructible resin capsule 16.
  • the bolt 18, tapered plug 22, expansion shell 26, and support nut 32 are rotated as a unit to mix the resin bonding components that had been contained within the destructible resin capsule.
  • the mixed resin bonding components flow downwardly around and over the expansion shell 26 and support nut 32.
  • continued rotation of the bolt 18 will cause the shear pin 24 to break.
  • the continued rotation of bolt 18 will cause tapered plug 22 to move downwardly as viewed in Figures 1 and 2 to cause the expansion fingers 30 of expansion shell 26 to be forced radially outwardly into forceful contact with the wall of bore 12.
  • the support nut 32 does not impede the flow of resin material downwardly around the shell and beyond the support nut 32.

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)
EP89308771A 1988-08-30 1989-08-30 Ecrou portant pour assemblage de boulon d'ancrage Withdrawn EP0361690A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23872988A 1988-08-30 1988-08-30
US238729 1988-08-30

Publications (1)

Publication Number Publication Date
EP0361690A1 true EP0361690A1 (fr) 1990-04-04

Family

ID=22899076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89308771A Withdrawn EP0361690A1 (fr) 1988-08-30 1989-08-30 Ecrou portant pour assemblage de boulon d'ancrage

Country Status (3)

Country Link
EP (1) EP0361690A1 (fr)
AU (1) AU4089289A (fr)
ZA (1) ZA896596B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113153398A (zh) * 2021-04-29 2021-07-23 中国科学院武汉岩土力学研究所 一种大变形预应力水力膨胀锚杆

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1152933A (fr) * 1956-04-28 1958-02-27 Brevets Wagner Soc D Boulon d'ancrage pour mines et autres applications
US3938420A (en) * 1974-06-27 1976-02-17 Gottschall Tool & Die, Inc. Mine roof bolt anchor construction
US4413930A (en) * 1980-11-21 1983-11-08 Jennmar Corporation Method and apparatus for combining resin bonding and mechanical anchoring of a bolt in a rock formation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1152933A (fr) * 1956-04-28 1958-02-27 Brevets Wagner Soc D Boulon d'ancrage pour mines et autres applications
US3938420A (en) * 1974-06-27 1976-02-17 Gottschall Tool & Die, Inc. Mine roof bolt anchor construction
US4413930A (en) * 1980-11-21 1983-11-08 Jennmar Corporation Method and apparatus for combining resin bonding and mechanical anchoring of a bolt in a rock formation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113153398A (zh) * 2021-04-29 2021-07-23 中国科学院武汉岩土力学研究所 一种大变形预应力水力膨胀锚杆

Also Published As

Publication number Publication date
AU4089289A (en) 1990-03-08
ZA896596B (en) 1990-06-27

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19901005