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WO2012083317A1 - Boulon d'ancrage hydrauliquement expansible - Google Patents

Boulon d'ancrage hydrauliquement expansible Download PDF

Info

Publication number
WO2012083317A1
WO2012083317A1 PCT/ZA2011/000096 ZA2011000096W WO2012083317A1 WO 2012083317 A1 WO2012083317 A1 WO 2012083317A1 ZA 2011000096 W ZA2011000096 W ZA 2011000096W WO 2012083317 A1 WO2012083317 A1 WO 2012083317A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
groove
drill hole
friction element
bolt
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.)
Ceased
Application number
PCT/ZA2011/000096
Other languages
English (en)
Inventor
Theodor Daniel Swemmer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2012083317A1 publication Critical patent/WO2012083317A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid

Definitions

  • rock bolt of the invention Whilst, in this specification, the hydraulically expandable rock bolt is described in the context of underground mining, it will be appreciated that the rock bolt of the invention will also find application in the context of many earth anchoring applications, such as tunnelling and other civil engineering works involving earth excavation and anchoring.
  • the shaft is folded in on itself longitudinally to define a single longitudinally extending groove, the tubular shaft being formed to define an open depression extending substantially the length of the shaft, the friction element being located within the groove and the groove and friction element being dimensioned such that the friction element is fully received within the groove in the unexpended condition of the shaft and to protrude radially from the groove in the expanded condition of the shaft.
  • the invention includes a method of installing a hydraulically expandable earth anchoring bolt such as that described above, the method comprising the steps, prior to installation of the bolt in the drill hole, of locating, within a longitudinally extending groove in the bolt shaft, a friction element that is dimensioned to be fully received within the groove in the unexpanded condition of the shaft and to protrude radially from the groove in the expanded condition of the shaft and expanding the shaft by introducing a fluid under pressure into the interior of the shaft by means of the fluid inlet for hydraulic pressure expansion of the shaft.
  • Figure 1 is a diagrammatical sectional side elevation of a rock bolt according to the invention
  • Figure 3 is a section on a line 3 - 3 in Figure 2;
  • Figure 5 is a diagrammatical sectional side elevation of a bolt and nut assembly according to the invention. Description of embodiments of the invention
  • the tubular shaft 12 is folded in on itself longitudinally to define (in the example illustrated) a single longitudinally extending groove 18. This is done by drawing, rolling, folding or simply pressing the tubular shaft 12 in on itself longitudinally such that the resulting depression defines a groove 18 extending substantially the length of the tubular shaft 12.
  • the projection end 16 of the shaft includes a fluid inlet valve 20.
  • the valve 20 is shaped to conform to the hydraulic pump nozzles conventionally used in underground mining, the nozzle (not shown) constituting a filler head for introducing fluid under pressure into the interior of the tubular shaft 12 by means of the valve 20 for hydraulic pressure expansion of the tubular shaft 12 in use.
  • the tubular shaft 12 is made of steel that is sufficiently malleable (by selection of tube wall thickness and deformability) to permit radial deformation of the tubular shaft 12 by means of hydraulic pressure applied to the enclosed shaft interior.
  • the tube In use, upon the application of sufficient internal hydraulic pressure, the tube is expanded from an inoperative, unexpended condition, to an operative, expanded condition.
  • the tubular shaft 12 In the inoperative, unexpanded condition, the tubular shaft 12 can be inserted into the drill hole which is typically bored to a diameter just greater than the outer diameter of the tubular shaft 12.
  • the tube wall balloons radially outwardly to engage the wall of the drill hole to anchor the shaft frictionally in the drill hole.
  • the saw tooth plate 22 is constituted by a plate 24, the base 26 of which is flat and adapted to engage the flat base 28 of the groove 18.
  • the crest or upper (or outwardly protruding) surface 30 of the saw tooth plate 22 is serrated.
  • the saw tooth plate 22 is dimensioned to be fully received within the groove 18 in the unexpanded condition of the tubular shaft 12. This will ensure that the saw tooth plate 22 does not snag against the rock of the drill hole wall during insertion of the rock bolt 10 into the drill hole.

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)
  • Piles And Underground Anchors (AREA)

Abstract

Cette invention porte sur un boulon d'ancrage hydrauliquement expansible, constitué par une tige tubulaire 12 qui est repliée longitudinalement sur elle-même pour définir une rainure 18. En utilisation, la tige tubulaire 12 est étendue d'une condition non fonctionnelle, non étendue, à une condition fonctionnelle, étendue, au moyen d'une pression hydraulique. Un élément de frottement se présentant sous la forme d'une plaque à dents de scie 22 est disposé à l'intérieur de la rainure longitudinale 18. La plaque à dents de scie 22 est dimensionnée pour être entièrement reçue à l'intérieur de la rainure 18 dans l'état non étendu de la tige tubulaire 12. Durant l'extension de la tige tubulaire 12, la profondeur de la rainure est réduite, ce qui force la plaque à dents de scie 22 radialement vers l'extérieur. Par conséquent, la plaque à dents de scie 22 fait saillie radialement à partir de la rainure aplatie 18 et, dans un trou de perçage, presse la surface supérieure dentelée 30 de la plaque à dents de scie 22 en contact de frottement avec la paroi du trou de perçage.
PCT/ZA2011/000096 2010-12-15 2011-12-15 Boulon d'ancrage hydrauliquement expansible Ceased WO2012083317A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ZA2010/06541 2010-12-15
ZA201006399 2010-12-15
ZA201006541 2010-12-15
ZA2010/06399 2010-12-15

Publications (1)

Publication Number Publication Date
WO2012083317A1 true WO2012083317A1 (fr) 2012-06-21

Family

ID=46245151

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2011/000096 Ceased WO2012083317A1 (fr) 2010-12-15 2011-12-15 Boulon d'ancrage hydrauliquement expansible

Country Status (2)

Country Link
WO (1) WO2012083317A1 (fr)
ZA (1) ZA201304832B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9863248B2 (en) 2015-04-23 2018-01-09 Jason L. Moon Friction bolt
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
CN113914338A (zh) * 2021-11-16 2022-01-11 大连理工大学 一种用于提高高速公路路堤稳定性的加固装置
CN119435069A (zh) * 2025-01-13 2025-02-14 中煤科工开采研究院有限公司 一种自锚固锚杆及其施工方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1643731A1 (ru) * 1989-04-24 1991-04-23 Отдел Института горного дела СО АН СССР Анкер дл закреплени грунтов и м гких горных пород
EP0637676A1 (fr) * 1993-01-26 1995-02-08 LOGASHKIN, Sergei Alexeevich Etai de soutien conformable
ZA200306395B (en) * 2002-08-19 2004-02-11 John Paul Mckelvey Rock bolt.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1643731A1 (ru) * 1989-04-24 1991-04-23 Отдел Института горного дела СО АН СССР Анкер дл закреплени грунтов и м гких горных пород
EP0637676A1 (fr) * 1993-01-26 1995-02-08 LOGASHKIN, Sergei Alexeevich Etai de soutien conformable
ZA200306395B (en) * 2002-08-19 2004-02-11 John Paul Mckelvey Rock bolt.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9863248B2 (en) 2015-04-23 2018-01-09 Jason L. Moon Friction bolt
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
CN113914338A (zh) * 2021-11-16 2022-01-11 大连理工大学 一种用于提高高速公路路堤稳定性的加固装置
CN113914338B (zh) * 2021-11-16 2022-05-27 大连理工大学 一种用于提高高速公路路堤稳定性的加固装置
CN119435069A (zh) * 2025-01-13 2025-02-14 中煤科工开采研究院有限公司 一种自锚固锚杆及其施工方法

Also Published As

Publication number Publication date
ZA201304832B (en) 2014-05-28

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