EP0265283A1 - Gebirgsanker - Google Patents

Gebirgsanker Download PDF

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Publication number
EP0265283A1
EP0265283A1 EP87309396A EP87309396A EP0265283A1 EP 0265283 A1 EP0265283 A1 EP 0265283A1 EP 87309396 A EP87309396 A EP 87309396A EP 87309396 A EP87309396 A EP 87309396A EP 0265283 A1 EP0265283 A1 EP 0265283A1
Authority
EP
European Patent Office
Prior art keywords
bolt
rock bolt
leading portion
rock
bonding agent
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Withdrawn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
EP87309396A
Other languages
English (en)
French (fr)
Inventor
Jose Luis Santa
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.)
Sunlea Developments Pty Ltd
Joe Santa and Associates Pty Ltd
Arthur Edward Pty Ltd
Sunlea Investments Pty Ltd
Original Assignee
Sunlea Developments Pty Ltd
Joe Santa and Associates Pty Ltd
Arthur Edward Pty Ltd
Sunlea Investments 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 Sunlea Developments Pty Ltd, Joe Santa and Associates Pty Ltd, Arthur Edward Pty Ltd, Sunlea Investments Pty Ltd filed Critical Sunlea Developments Pty Ltd
Publication of EP0265283A1 publication Critical patent/EP0265283A1/de
Withdrawn legal-status Critical Current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
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting

Definitions

  • the present invention relates to rock bolts and more particularly but not exclusively to rock bolts as employed to support a mine roof.
  • bolts are required to support the mine roof. These bolts are held in position by chemical bonding of the bolt into drilled holes in the roof's draft.
  • This invention provides a rock bolt having a leading portion provided with at least one groove extending longitudinally and angularly of the bolt, said groove extending angularly about the bolt in the direction opposite to that in which the bolt is spun.
  • the rock bolt has a leading edge which is chamfered so as to provide the leading portion with a frusto-conical configuration.
  • a roof bolt 10 having an elongated shank 11 with a leading portion (head) 12.
  • the other end of the shank 11 is threaded so as to have a threaded portion 13 which receives a tightened nut 14.
  • the leading portion 12 is provided with two slots 15 which extend angularly about and longitudinally of the shank 11, preferably extending approximately 20 to 50 mm (Dimension 'A') from the leading edge 17 of the rock bolt 10. Still further, the leading portion 12 is chamfered so as to provide the leading portion 12 with a "frusto-conical" configuration. Accordingly, the leading portion 12 has sloping surfaces 16 extending angularly about the longitudinal axis of the shank 11.
  • the slots 15 intersect with the sloping surfaces 16 so as to provide cutting edges 18 which aid in the breaking open of the plastic tube 19, and hence allowing the two-part bonding agent to be efficiently discharged from the plastic tube 19.
  • the slots 15 extend angularly about the shank 11 in the direction opposite to that in which the rock bolt 10 is spun upon entry into the hole.
  • the slots 15 provide a convenient passage for the bonding agent to move away from the end of the hole and ensures that the two-part chemi cal bonding agent is distributed longitudinally of the shank 11 in order to provide a good bond with the drilled hole.
  • the slots 15 and sloping surfaces 16 can be provided in conjunction with the standard features of previously known rock bolts wherein at least one positive (or raised) ridge 19 extending longitudinally and angularly (in an opposite sense to the slot(s) 15) is/are provided along the length of the bolt up to the threaded rearward portion 13.
  • the ridge(s) 19 provide a screw feed means for the bonding agent to be distributed along the length of the shank 11.
  • a hole 1 is drilled in the mine roof 2. Thereafter, a two-part plastic tube 3 is inserted containing the two-part bonding agent 4.
  • the roof bolt 10 is simultaneously inserted in the hole and spun. As the roof bolt 10 is spun whilst being driven longitudinally into the hole, the leading edge of the rock bolt 10 breaks the plastic tube 3 thus releasing the contents thereof when are then mixed by the leading portion 12 of the rock bolt 10. As the roof bolt 10 is spun, the combination of gravity force, a pumping action due to compressive forces on the bonding agent 4 by the bolt 10, the ridges 19, and the slots 15 causes the two parts of the chemical bonding agent 4 to be sufficiently mixed and distributed longitudinally of the shank 11 to ensure a good bond with the drilled hole 1.
  • the slots 15 the ridges 19, and the bonding agent 4 adhered thereto provide the necessary resistance to longitudinal movement of the bolt 10, thus negating the need to "tighten” the bolt 10 after the bonding agent 4 is cured. It is preferably that the bonding agent 4 adheres to the surfaces of the hole 1 and the rock bolt 10.
  • a ceiling retainer strip 20 may then be mounted onto the threaded rearward portion 13 of the rock bolt 10 using the retention nut 14.

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)
  • Joining Of Building Structures In Genera (AREA)
  • Dowels (AREA)
  • Piles And Underground Anchors (AREA)
EP87309396A 1986-10-23 1987-10-23 Gebirgsanker Withdrawn EP0265283A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU8646/86 1986-10-23
AU864686 1986-10-23

Publications (1)

Publication Number Publication Date
EP0265283A1 true EP0265283A1 (de) 1988-04-27

Family

ID=3699353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87309396A Withdrawn EP0265283A1 (de) 1986-10-23 1987-10-23 Gebirgsanker

Country Status (1)

Country Link
EP (1) EP0265283A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2323648A (en) * 1997-03-25 1998-09-30 Mai Sys Uk Ltd Adhesively secured bolt and method of manufacture
WO1998057035A1 (en) * 1997-06-12 1998-12-17 Steeledale Group Limited A rock bolt

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2059535A (en) * 1979-09-17 1981-04-23 Rozanc R C Mine roof support plate bolt
GB2062794A (en) * 1979-10-16 1981-05-28 Upat Max Langensiepen Kg Method of setting anchoring bolts
US4386877A (en) * 1979-03-28 1983-06-07 Peabody Coal Company Mine roof bolting
GB2142998A (en) * 1983-07-05 1985-01-30 Richard Clinton Rozanc Method of anchoring bolts in rock or concrete

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386877A (en) * 1979-03-28 1983-06-07 Peabody Coal Company Mine roof bolting
GB2059535A (en) * 1979-09-17 1981-04-23 Rozanc R C Mine roof support plate bolt
GB2062794A (en) * 1979-10-16 1981-05-28 Upat Max Langensiepen Kg Method of setting anchoring bolts
GB2142998A (en) * 1983-07-05 1985-01-30 Richard Clinton Rozanc Method of anchoring bolts in rock or concrete

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED, Section Mechanical, week 8441, abstract no. 255385 Q49, 21st November 1984, Derwent Publications Ltd., London, GB; & SU - A - 10 73471 (STEPANISHCHEV O N) 15-02-1984 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2323648A (en) * 1997-03-25 1998-09-30 Mai Sys Uk Ltd Adhesively secured bolt and method of manufacture
WO1998057035A1 (en) * 1997-06-12 1998-12-17 Steeledale Group Limited A rock bolt

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Legal Events

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

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AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19881013

17Q First examination report despatched

Effective date: 19900219

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19900703