WO2022251887A1 - Siège sphérique modifié pour ensemble boulon d'ancrage - Google Patents

Siège sphérique modifié pour ensemble boulon d'ancrage Download PDF

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Publication number
WO2022251887A1
WO2022251887A1 PCT/ZA2022/050020 ZA2022050020W WO2022251887A1 WO 2022251887 A1 WO2022251887 A1 WO 2022251887A1 ZA 2022050020 W ZA2022050020 W ZA 2022050020W WO 2022251887 A1 WO2022251887 A1 WO 2022251887A1
Authority
WO
WIPO (PCT)
Prior art keywords
rod
spherical seat
rock bolt
bolt assembly
distal end
Prior art date
Application number
PCT/ZA2022/050020
Other languages
English (en)
Inventor
Knox GREIG
Original Assignee
Innovative Mining Products (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 Innovative Mining Products (Pty)Ltd filed Critical Innovative Mining Products (Pty)Ltd
Publication of WO2022251887A1 publication Critical patent/WO2022251887A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
    • 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
    • E21D21/0093—Accessories
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B2210/00—Aspects not specifically covered by any group under G01B, e.g. of wheel alignment, caliper-like sensors
    • G01B2210/66—Rock or ground anchors having deformation measuring means

Definitions

  • the invention relates to a rock bolt assembly which is adapted for measuring the strain on a rock bolt shaft as it yields under load when placed in situ.
  • rock wall support such as installed rock bolts
  • a rock bolt is provided with an elongate electrically conductive element, such as a length of metal wire, which runs along a substantial length of the bolt, originating at an electronic measuring module at a proximal end of the bolt and ending at or towards a distal end of the bolt.
  • an electrically conductive element such as a length of metal wire
  • the invention at least partially solves the aforementioned problem.
  • spherical and “spherically” when used to describe a surface is used to describe the surface as being a rounded or convexly curved, despite the surface not being truly spherical.
  • the invention provides a strain measuring rock bolt assembly which includes: a yielding rod of a malleable material that extends between a distal end and a proximal end; a spherical seat engaged to the rod that has a body with a first surface, facing the distal end, at least a part of which is spherically shaped, and a second surface, facing the proximal end, the spherical seat including at least one passage which communicates the first surface with the second surface; and an elongate member of an electrically conductive material engaged to the rod along a substantial length of the rod by passing through the passage.
  • the elongate member may be adapted to elongate as the rod elongates under load as a measure of the load.
  • the second surface may be planar.
  • the elongate member may be a length of wire of a suitable metal material.
  • the assembly may include a processing module.
  • the processing module may be housed in a housing which is engaged to the bolt towards the proximal end.
  • the elongate member may connect, at one end, to the processing module and, at an opposed end, may be fixed to the rod towards the distal end.
  • the invention extends to an adapted spherical seat for use with a strain measuring rock bolt, which spherical seat includes a body with a spherical surface and a planar surface and at least one conduit which extends between the spherical surface and the planar surface and which is adapted to receive an elongate member of an electrically conductive material.
  • the invention of the adapted spherical seat which is used with a rock bolt which is adapted to measure strain by including an electrically conductive elongate member, which spherical seat includes a body with a first surface, at least a part of which is spherically shaped, and a second surface and at least one passage which communicates the first surface with the second surface and which is adapted to receive the electrically conductive elongate member.
  • Figure 1A is a diagrammatic representations of a strain measuring rock bolt assembly in accordance with the invention
  • Figure 1 B diagrammatically illustrates a spherical seat of the assembly
  • Figures 2A, 2B and 2C respectively illustrate the spherical seat in elevation, in longitudinal section and in under plan.
  • the invention provides a rock bolt assembly 10, which is adapted to measure the strain that a yielding rod 12 of the assembly is subjected to when put in use. This assembly is illustrated in Figure 1.
  • the rock bolt assembly 10 includes the yielding rod 12, which is made of a suitable malleable metal material and which extends between a distal end 14 and a proximal end 16, a faceplate 18 and a spherical seat 20.
  • the spherical seat is adapted in accordance with an aspect of the invention.
  • the rod is partially externally threaded along a proximal end portion 22.
  • the spherical seat 20 has a body 24 which extends in the longitudinal direction of the assembly between a first leading surface 26 and a second trailing surface 28.
  • the trailing surface is largely a planar surface.
  • the spherical seat 20 is penetrated by a centrally positioned rod- engaging cylindrical aperture 30.
  • the aperture opens at both the first and the second surfaces.
  • the wall of the aperture has a threaded section 31 .
  • the leading surface 26 of body is adapted with a rounded or spherical surface section 32 and a tubular surface section 34 (see Figure 2A and 2B).
  • the tubular surface section extends from the spherical surface section in the longitudinal direction.
  • a pair of diametrically opposed wire-guiding slots 40 are formed in the tubular surface section 34. Each slot extends in the longitudinal direction and leads to a respective bore 42 at an intersection of the tubular surface section and the spherical surface section. Each bore extends through the body from the spherical surface section 32 to the trailing surface 28.
  • the rock bolt assembly 10 is assembled with the threaded section 31 of the aperture 30 of the spherical seat 20 engaging the threaded proximal end portion 22 of the rod 12.
  • the faceplate 18 is engaged with the rod, coming to rest abutting the spherical surface section 32 of the spherical seat 20.
  • a wire 44 or other suitably adapted elongate strain detection element, is fixed or fastened to an exterior surface of the rod 12, extending in the longitudinal direction, with a first end 46 fixed about or towards the distal end 14 of the rod, and an opposed second end 48 connected to a processing module 50.
  • the processing module is housed in a housing 52 which is attached to the proximal end 16 of the rod.
  • the processing module receives electrical input from the wire, the magnitude of which is a function of elongation of the wire and hence the strain imposed on the rod to which the wire is connected. This input is translated into a measure of strain by the processing module, the output of which may be a visual and/or auditory warning that the measure of strain exceeds a predetermined limit.
  • the wire will pass a junction between the spherical seat and the faceplate. At this junction, the wire might be functionally impinged or severed. To avoid this, the wire 44 passes along a respective slot 40 and through a respective bore 42 of the spherical seat.

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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un ensemble boulon d'ancrage de mesure de contrainte qui comprend une tige flexible en matériau malléable qui s'étend entre une extrémité distale et une extrémité proximale, un siège sphérique en prise avec la tige qui comporte un corps avec une première surface, faisant face à l'extrémité distale, dont au moins une partie est de forme sphérique, et une seconde surface, faisant face à l'extrémité proximale, le siège sphérique comprenant au moins un passage qui fait communiquer la première surface avec la seconde surface, et un élément allongé d'un matériau électriquement conducteur en prise avec la tige sur une longueur substantielle de la tige à travers le passage.
PCT/ZA2022/050020 2021-05-28 2022-05-17 Siège sphérique modifié pour ensemble boulon d'ancrage WO2022251887A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA202103655 2021-05-28
ZA2021/03655 2021-05-28

Publications (1)

Publication Number Publication Date
WO2022251887A1 true WO2022251887A1 (fr) 2022-12-01

Family

ID=81927793

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2022/050020 WO2022251887A1 (fr) 2021-05-28 2022-05-17 Siège sphérique modifié pour ensemble boulon d'ancrage

Country Status (1)

Country Link
WO (1) WO2022251887A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007059580A1 (fr) * 2005-11-24 2007-05-31 Peter Andrew Gray Boulon d’ancrage autoperceur
US20170321552A1 (en) * 2014-11-13 2017-11-09 Rock Safety Sweden Ab Arrangement for rock bolts and a method for the use of the arrangement, and a reinforcement system comprising such an arrangement
WO2020061598A1 (fr) * 2018-09-21 2020-03-26 Epiroc Holdings South Africa (Pty) Ltd Boulon d'ancrage doté d'un moyen de détection de contrainte

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007059580A1 (fr) * 2005-11-24 2007-05-31 Peter Andrew Gray Boulon d’ancrage autoperceur
US20170321552A1 (en) * 2014-11-13 2017-11-09 Rock Safety Sweden Ab Arrangement for rock bolts and a method for the use of the arrangement, and a reinforcement system comprising such an arrangement
WO2020061598A1 (fr) * 2018-09-21 2020-03-26 Epiroc Holdings South Africa (Pty) Ltd Boulon d'ancrage doté d'un moyen de détection de contrainte

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