EP0272233A1 - Method of stabilizing a rock structure and stabilizer therefor - Google Patents

Method of stabilizing a rock structure and stabilizer therefor Download PDF

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Publication number
EP0272233A1
EP0272233A1 EP87850353A EP87850353A EP0272233A1 EP 0272233 A1 EP0272233 A1 EP 0272233A1 EP 87850353 A EP87850353 A EP 87850353A EP 87850353 A EP87850353 A EP 87850353A EP 0272233 A1 EP0272233 A1 EP 0272233A1
Authority
EP
European Patent Office
Prior art keywords
stabilizer
rock
drillhole
expansible
inlet
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Withdrawn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
EP87850353A
Other languages
German (de)
English (en)
French (fr)
Inventor
Karl Gösta Lindh
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.)
Atlas Copco AB
Original Assignee
Atlas Copco AB
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 Atlas Copco AB filed Critical Atlas Copco AB
Publication of EP0272233A1 publication Critical patent/EP0272233A1/en
Withdrawn legal-status Critical Current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
    • E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means
    • 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
    • E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally

Definitions

  • This invention relates to a method of stabilizing a rock structure and a stabilizer adapted for performing the method.
  • a rock stabilizer which comprises a tube to be inserted in the borehole and then expanded at discrete points by pulsed magnetic fields induced by high voltage pulses in a coil on a probe that is temporarily inserted in the stabilizer.
  • the stabilizer is cheap but the necessary equipment very expensive and there are considerable safety hazards due to the high voltage.
  • the rock stabilizer 10 or roof bolt shown in Fig 1 comprises a closed elongated straight cylindrical tube 11 of steel of a property providing uniform elongation under expansive load.
  • a suitable steel given as an example is the deep drawing quality steel Swedish standard SS 141147. If the outer diameter of the tube 11 is designated D cm, its perimeter would be ⁇ D cm. Unchanged in perimeter the tube may have a slightly welled or somewhat irregular cross-section for increased stiffness.
  • the bottom end of the tube 11 is closed tightly by a circular plate 12 welded to the tube 11 preferably by friction welding. To the outer end is similarly tightly connected a flange 13 with an outwardly protruding cylindrical boss 14. An inlet 15 of a passage 16 to the interior of tube 11 is provided on the boss 14.
  • the stabilizer 10 is freely inserted into a drillhole 20 drilled in a rock structure 21 with a diameter somewhat larger than D cm. While inserted, the stabilizer 10 by its flange 13 keeps a supporting plate 22 which surrounds the tube 11, resting against the rock 21.
  • a diagrammatically indicated chuck 25 preferably of the type shown in US patent 4 423 986, Figs 1, 10, is slipped and tightly set onto boss 14 and the opening 15 is supplied under pressure control of a valve 26 by hydraulic high pressure fluid under a pressure of up to 500 bar from a pump 27.
  • This pressurizes the interior of the stabilizer 10 causing a radial expansion thereof which fills the normal always present irregularities of the drillhole and widens the surrounding rock elastically as depicted in Fig 3.
  • the pressure is then relieved and the chuck 25 removed so that the stabilizer eventually is emptied of fluid.
  • the stabilizer remains firmly anchored in the drillhole 20 due to the significantly larger shrinkage fit of the rock 21 around the expanded stabilizer 10.
  • a suitable manometer or other instrument in the hydraulic supply may be used for increased control during the radial hydraulic expansion of the stabilizer 10.
  • the stabilizer 10 may be provided instead of the boss 14 with a coupling nipple 28 of the type shown in Fig 4. In such case a quick release coupling may be used for the hydraulic high pressure fluid supply.
  • extensible expansible tubular stabilizer sections 30 may be used, at will combined with non-expansible (narrow channel 36) sections 31 of the type shown in Fig 7, both sections 30,31 having respectively male and female coupling means 34,35 for tight interconnection of their ends.
  • a head 32 with a coupling means formed by a threaded hole 33, Fig 4 provides the outer end of the extended stabilizer, to which for example one or more non-expansible sections 31 can be tightly connected as by threaded coupling means 34,35 and terminated within the drillhole by one or more expansible sections 30 coupled thereto, the last of them closed by a threaded plug 38, Fig 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Structural Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Earth Drilling (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Stringed Musical Instruments (AREA)
  • Holders For Apparel And Elements Relating To Apparel (AREA)
  • Gripping On Spindles (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP87850353A 1986-12-16 1987-11-18 Method of stabilizing a rock structure and stabilizer therefor Withdrawn EP0272233A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8605408A SE8605408D0 (sv) 1986-12-16 1986-12-16 Method of stabilizing a rock structure and stabilizer therefor
SE8605408 1986-12-16

Publications (1)

Publication Number Publication Date
EP0272233A1 true EP0272233A1 (en) 1988-06-22

Family

ID=20366660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87850353A Withdrawn EP0272233A1 (en) 1986-12-16 1987-11-18 Method of stabilizing a rock structure and stabilizer therefor

Country Status (11)

Country Link
EP (1) EP0272233A1 (cs)
JP (1) JPS63223300A (cs)
AU (1) AU594846B2 (cs)
CA (1) CA1286603C (cs)
CS (1) CS274416B2 (cs)
FI (1) FI875508A (cs)
HU (1) HUT48711A (cs)
NO (1) NO875236L (cs)
PL (1) PL269500A1 (cs)
SE (1) SE8605408D0 (cs)
ZA (1) ZA878649B (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004099570A1 (en) * 2003-05-12 2004-11-18 Atlas Copco Rock Drills Ab Controlled expansion of rock bolt
EP1693550A1 (en) * 2003-11-17 2006-08-23 Nisshin Steel Co., Ltd. Lock bolt made of steel pipe
US7270501B2 (en) * 2003-05-12 2007-09-18 Atlas Copco Rock Drills Ab Expandable rock bolt and rock bolting system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7044678B2 (en) * 2001-07-19 2006-05-16 Atlas Copco Mai Gmbh Connecting an anchoring rod to a drilling tool

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349567A (en) * 1964-06-03 1967-10-31 John E Munn Mine roof support and method of providing same
US4098087A (en) * 1976-12-02 1978-07-04 Battelle Development Corporation Anchoring bolt and method
US4423986A (en) * 1980-09-08 1984-01-03 Atlas Copco Aktiebolag Method and installation apparatus for rock bolting
EP0207030B1 (en) * 1985-06-17 1989-12-06 Atlas Copco Aktiebolag Method of stabilizing a rock structure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6871181A (en) * 1980-03-28 1981-10-01 Thom, R.W. Anchor bolt
SE8106165L (sv) * 1981-10-19 1983-04-20 Atlas Copco Ab Forfarande for bergbultning och bergbult

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349567A (en) * 1964-06-03 1967-10-31 John E Munn Mine roof support and method of providing same
US4098087A (en) * 1976-12-02 1978-07-04 Battelle Development Corporation Anchoring bolt and method
US4423986A (en) * 1980-09-08 1984-01-03 Atlas Copco Aktiebolag Method and installation apparatus for rock bolting
EP0207030B1 (en) * 1985-06-17 1989-12-06 Atlas Copco Aktiebolag Method of stabilizing a rock structure

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004099570A1 (en) * 2003-05-12 2004-11-18 Atlas Copco Rock Drills Ab Controlled expansion of rock bolt
US7270501B2 (en) * 2003-05-12 2007-09-18 Atlas Copco Rock Drills Ab Expandable rock bolt and rock bolting system
US7320560B2 (en) 2003-05-12 2008-01-22 Atlas Copco Rock Drills Ab Controlled expansion of rock bolt
AU2004236623B2 (en) * 2003-05-12 2008-12-18 Epiroc Rock Drills Aktiebolag Controlled expansion of rock bolt
AU2004236622B2 (en) * 2003-05-12 2010-01-28 Atlas Copco Rock Drills Ab Expandable rock bolt and rock bolting system
CN1788140B (zh) * 2003-05-12 2010-08-11 阿特拉斯科普科凿岩机股份公司 可扩张岩栓及岩石锚杆系统
CN1791734B (zh) * 2003-05-12 2012-10-10 阿特拉斯科普科凿岩机股份公司 岩栓的受控扩张
NO336673B1 (no) * 2003-05-12 2015-10-19 Atlas Copco Rock Drills Ab Kontrollert ekspansjon av bergbolt
EP1693550A1 (en) * 2003-11-17 2006-08-23 Nisshin Steel Co., Ltd. Lock bolt made of steel pipe
EP1693550A4 (en) * 2003-11-17 2009-09-30 Nisshin Steel Co Ltd STEEL LOCK BOLT
US7927043B2 (en) * 2003-11-17 2011-04-19 Nisshin Steel Co., Ltd. Rockbolts made of steel pipes

Also Published As

Publication number Publication date
NO875236L (no) 1988-06-20
FI875508A (fi) 1988-06-17
CA1286603C (en) 1991-07-23
SE8605408D0 (sv) 1986-12-16
AU8259387A (en) 1988-06-16
PL269500A1 (en) 1988-08-18
ZA878649B (en) 1988-05-18
AU594846B2 (en) 1990-03-15
CS924387A2 (en) 1990-09-12
JPS63223300A (ja) 1988-09-16
FI875508A0 (fi) 1987-12-15
NO875236D0 (no) 1987-12-15
HUT48711A (en) 1989-06-28
CS274416B2 (en) 1991-04-11

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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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Designated state(s): AT BE CH DE ES FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19881205

17Q First examination report despatched

Effective date: 19900420

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: 19910724

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LINDH, KARL GOESTA