WO2017087995A3 - Loss of load indicator device for rock bolt - Google Patents

Loss of load indicator device for rock bolt Download PDF

Info

Publication number
WO2017087995A3
WO2017087995A3 PCT/ZA2016/000031 ZA2016000031W WO2017087995A3 WO 2017087995 A3 WO2017087995 A3 WO 2017087995A3 ZA 2016000031 W ZA2016000031 W ZA 2016000031W WO 2017087995 A3 WO2017087995 A3 WO 2017087995A3
Authority
WO
WIPO (PCT)
Prior art keywords
rock bolt
passage
loss
load
indicator device
Prior art date
Application number
PCT/ZA2016/000031
Other languages
French (fr)
Other versions
WO2017087995A2 (en
Inventor
Brendan Robert Crompton
Rual ABREU
Philip John MAXTON
Original Assignee
Ncm Innovations (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 Ncm Innovations (Pty) Ltd filed Critical Ncm Innovations (Pty) Ltd
Publication of WO2017087995A2 publication Critical patent/WO2017087995A2/en
Publication of WO2017087995A3 publication Critical patent/WO2017087995A3/en

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
    • E21D21/02—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection having means for indicating tension
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/045—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front having axially compressing parts allowing the clamping of an object tightly to the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • F16B31/028—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load with a load-indicating washer or washer assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
    • F16B2200/95—Constructional details of connections not covered for in other groups of this subclass with markings, colours, indicators or the like

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

The invention provides a load loss indicating device which includes a body 28A, a passage 36 to receive a rock bolt, the passage including a narrow portion and a broad portion and a spring 42 within the broad portion of the passage. The spring is compressed when load is applied to the rock bolt and expands when load is lost pushing indicator sleeve 48 made from coloured plastics material into an exposed position outside of the passage.
PCT/ZA2016/000031 2015-11-19 2016-11-03 Loss of load indicator device WO2017087995A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ZA2015/08536 2015-11-19
ZA201508536 2015-11-19
ZA201508724 2015-11-30
ZA2015/08724 2015-11-30

Publications (2)

Publication Number Publication Date
WO2017087995A2 WO2017087995A2 (en) 2017-05-26
WO2017087995A3 true WO2017087995A3 (en) 2017-07-20

Family

ID=58277332

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2016/000031 WO2017087995A2 (en) 2015-11-19 2016-11-03 Loss of load indicator device

Country Status (1)

Country Link
WO (1) WO2017087995A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201807373D0 (en) * 2018-05-04 2018-06-20 Norwegian Univ Of Science And Technology Rock bolts
WO2020093092A1 (en) * 2018-11-06 2020-05-14 Lyster Jarrad Clayton Monitoring device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179082A (en) * 1961-08-22 1965-04-20 William G B Mcclean Expansion bolts
US5185595A (en) * 1990-06-13 1993-02-09 Friesen Gordon R Rockbolt monitor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179082A (en) * 1961-08-22 1965-04-20 William G B Mcclean Expansion bolts
US5185595A (en) * 1990-06-13 1993-02-09 Friesen Gordon R Rockbolt monitor

Also Published As

Publication number Publication date
WO2017087995A2 (en) 2017-05-26

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