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WO2025014413A1 - Dispositifs et procédés de détermination de l'intégrité de barres métalliques allongées - Google Patents

Dispositifs et procédés de détermination de l'intégrité de barres métalliques allongées Download PDF

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Publication number
WO2025014413A1
WO2025014413A1 PCT/SE2024/050634 SE2024050634W WO2025014413A1 WO 2025014413 A1 WO2025014413 A1 WO 2025014413A1 SE 2024050634 W SE2024050634 W SE 2024050634W WO 2025014413 A1 WO2025014413 A1 WO 2025014413A1
Authority
WO
WIPO (PCT)
Prior art keywords
metallic bar
elongated metallic
conductive wire
electrical signal
rock 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.)
Pending
Application number
PCT/SE2024/050634
Other languages
English (en)
Inventor
Jens Eliasson
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.)
Thingwave AB
Original Assignee
Thingwave 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 Thingwave AB filed Critical Thingwave AB
Publication of WO2025014413A1 publication Critical patent/WO2025014413A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/20—Investigating the presence of flaws
    • 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
    • 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
    • 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
    • G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • 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
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0093—Accessories
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/24—Investigating the presence of flaws
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00

Definitions

  • the present disclosure relates generally to devices and methods for determining integrity of elongated metallic bars.
  • the present disclosure also relates to metallic bars comprising such devices.
  • Bolts of the end-anchored type normally have at their forward end an anchor arrangement such as a wedge for mechanical anchoring at the bottom of the borehole, and the tension in the bolt is more or less constant over its length.
  • Fully grouted bolts achieve their principal load-bearing ability through adhesion along the complete length of the rock bolt that by means of grout with cement or epoxy resin.
  • the load distribution in this case is more complex and varies depending on factors such as (i) the physical properties of the bolt, (ii) the installation procedure, (iii) the grout or epoxy resin bond between the bolt and the rock borehole and (iv) the distribution of movement in the rock mass surrounding the bolt.
  • Rock reinforcement systems that are used in fracture-rich rock are subject to heavy loads.
  • the rock bolts may be placed under load locally at locations at which they cross large fractures between blocks, and thus subject to heavy loads that lead to the bolts becoming deformed, mainly through bending, elongation or rupturing.
  • the load exceeds the ability of the rock bolt to absorb force, such that the rock bolt breaks, i.e. , the integrity of the bolt fails, whereby the reinforcement system is weakened.
  • An object of the invention is to address at least some of the problems and issues outlined above.
  • An object of embodiments is to achieve an improved way of determining integrity of elongated metallic bars. Such an improved way should preferably be reliable and cost-efficient. It is possible to achieve one or more of these objects and possibly others by using devices and methods as defined in the attached independent claims.
  • a device for determining integrity of an elongated metallic bar extending from a proximal end to a distal end.
  • the device comprises a conductive wire having a first end and a second end.
  • the conductive wire is configured to be arranged to the elongated metallic bar so that it extends from the proximal end of the elongated metallic bar along the length of the elongated metallic bar to the distal end of the elongated metallic bar.
  • the conductive wire is to be electrically disconnected from the elongated metallic bar when it is arranged to the elongated metallic bar.
  • the device further comprises an electrical signal generator configured to be arranged at the proximal end of the metallic bar and operative for generating an electrical signal and applying the generated electrical signal to the first end of the conductive wire or to the proximal end of the elongated metallic bar.
  • the device further comprises an electrical signal receiver configured to be arranged at the proximal end of the elongated metallic bar and operative for receiving and measuring amplitude of a returned electrical signal returned in the elongated metallic bar when the generated electrical signal was applied to the conductive wire or returned in the conductive wire when the generated electrical signal was applied to the elongated metallic bar, the measured amplitude of the returned electrical signal being used for determining integrity of the elongated metallic bar.
  • Such a device can be made much more cost-efficient than prior art devices that are based on measuring time of flight of a signal sent and returned in the same wire, as such prior art devices need to be very sensitive to determine ruptures and remaining lengths due to the short time of flight. The time discussed for returned signals due to the capacitive effect is much longer wherefore the measurements apparatus in the present device can be made more cost-efficient.
  • the device further comprises an insulation sheath configured to be arranged to the elongated metallic bar so that it extends from the proximal end of the elongated metallic bar along the length of the elongated metallic bar to the distal end of the elongated metallic bar.
  • the conductive wire is arranged within the insulation sheath. By the conductive wire being arranged in the insulation sheath it is secured that the conductive wire is electrically disconnected from the elongated metallic bar.
  • the conductive wire is arranged movable within the sheath.
  • the conductive wire can be connected to a sensor for measuring elongation of the conductive wire when the conductive wire is attached to the distal end of the bolt, without the sheath hindering the conductive wire to be extended due to strain.
  • the conductive wire is configured to be electrically disconnectedly arranged in a groove extending along the elongated metallic bar, inside an interior cavity extending along the elongated metallic bar, or attached to the elongated metallic bar, along the elongated metallic bar.
  • the second end of the conductive wire is fastened to the distal end of the elongated metallic bar.
  • the device comprises a distance sensor arranged in the proximal end of the elongated metallic bar, the distance sensor being operative for measuring distance of movement of the second end of the conductive wire.
  • the conductive wire also for measuring changed elongation of the of the metallic bar due to tensile loads.
  • the device is arranged for determining integrity of the elongated metallic bar based on the measured amplitude.
  • the device further comprises communication means for communicating the measured amplitude or an integrity determined based on the measured amplitude to an external unit remote from the device.
  • the conductive wire is fastened to the distal end of the elongated metallic bar
  • the device further comprises a distance sensor arranged at the proximal end of the elongated metallic bar, the distance sensor being operative for measuring distance of movement of the conductive wire in relation to the elongated metallic bar.
  • an elongated metallic bar comprising at least one device according to any one of the preceding embodiments mounted thereon.
  • the elongated metallic bar is a rock bolt, a rebar, a cable bolt, a threaded bolt or a friction bolt.
  • a method for determining integrity of an elongated metallic bar comprises mounting at least one device according to any of the preceding embodiments on the metallic bar, generating an electrical signal and applying the generated electrical signal to the first end of the conductive wire or to the proximal end of the elongated metallic bar.
  • the method further comprises receiving and measuring amplitude of a returned electrical signal returned in the elongated metallic bar when the generated electrical signal was applied to the conductive wire or returned in the conductive wire when the generated electrical signal was applied to the elongated metallic bar, and determining integrity of the elongated metallic bar based on the measured amplitude.
  • the determining of the integrity further comprises determining integrity based on comparing the measured amplitude and amplitude of the electrical signal applied to the conductive wire or the metallic bar.
  • the determining of the integrity further comprises determining rupture position of the elongated metallic bar based on the measured amplitude.
  • the method further comprises measuring distance of movement of the second end of the conductive wire by a distance sensor arranged at the proximal end of the elongated metallic bar.
  • FIG. 1 schematically shows a cross-sectional side view of a rock bolt comprising a device for measuring amplitude of returned electrical signal, according to possible embodiments, installed in a bore hole in a rock wall.
  • FIG. 2 schematically shows a cross-sectional side view of a device for measuring amplitude of returned electrical signal arranged on a rock bolt, according to possible embodiments.
  • FIG. 3 shows a schematical side view of a rock bolt with possible rupture positions marked.
  • Fig. 4 shows a diagram of voltage over time for a returned electrical signal for the different rupture positions marked in Fig. 3.
  • the device of the present disclosure can be used in association with any sort of metallic bar structure, such as rebars, friction bolts, threaded bolts, cables and other flexible steel tendons such as cable bolts and is not limited to the measurement in rock bolts.
  • the embodiments can be applied to elongated metallic bars.
  • the terms are used interchangeably and should not be construed as limiting the scope of protection.
  • FIGs. 1 and 2 there is shown an example illustrating use of a device 20 for determining integrity of an elongated metallic bar 10 according to embodiments of the present invention, when the device 20 is arranged to such an elongated metallic bar 10.
  • the elongated metallic bar 10 is a rock bolt 10.
  • Fig. 2 shows the device 20 arranged to the rock bolt 10
  • fig. 1 shows the rock bolt 10 with the device 20 attached to it inserted into a bore hole 2.
  • a rock wall 1 for instance in a mine or a tunnel, there is drilled a bore hole 2 for mounting a rock bolt 10 therein.
  • the rock bolt 10 may thus be inserted and extends towards the distal end of the bore hole 2 to provide reinforcement of the rock wall 1 .
  • a plurality of rock bolts 10 may be installed to form a reinforcement system to secure the rock wall 1 during subsequent operation in the mine or tunnel.
  • the rock bolt 10 may be anchored in the bore hole 2 by means of grout or epoxy resin to provide substantially complete adhesion between the rock bolt 10 and the rock wall 1 .
  • a layer of shotcrete 3 may be applied to further secure the rock bolt 10 in the rock wall 1 .
  • the rock bolt 10 may be tightened by means of an anchor plate 4 and a nut 6.
  • a device 20 according to the present invention for determining integrity of an elongated metallic bar 10 may be installed on the rock bolt 10 before the rock bolt 10 is inserted into the bore hole 2.
  • the device 20 for determining integrity of an elongated metallic bar 10 comprises a conductive wire 13 having a first end 13a and an opposite second end 13b.
  • the material of the conductive wire 13 can be steel, aluminum, or any other conductive material.
  • the device 20 further comprises an electrical signal generator 9 operative for generating an electrical signal 14 and an electrical signal receiver 8 operative for receiving and analyzing a returned electrical signal 15.
  • the device 20 may further comprise an insulation sheath 11 in which the conductive wire 13 is arranged.
  • the purpose of the insulation sheath is to electrically insulate the conductive wire 13 from the rock bolt 10.
  • the material of the insulation sheath 11 can be for example any plastic, Teflon (PTFE), rubber, etc.
  • the conductive wire 13 is arranged to the elongated metallic bar 10 so that it extends from a proximal end 21 of the rock bolt 10 along the length of the rock bolt 10 to a distal end 29 of the rock bolt 10.
  • the length of the conductive wire 13 can be equal to the length of the rock bolt, shorter than or longer than the length of the rock bolt 10.
  • the first end 13a of the conductive wire 13 may be arranged to the proximal end 21 of the rock bolt 10.
  • the second end 13b of the conductive wire 13 may be arranged to the distal end 29 of the rock bolt 10.
  • the conductive wire 13 is arranged to or at the rock bolt 10 in such a way that the conductive wire 13 is electrically disconnected from the rock bolt 10.
  • the conductive wire 13 is arranged to the rock bolt 10 so that the conductive wire 13 and the metallic bar 10 do not have electrical contact.
  • the conductive wire 13 is preferably to be arranged to the rock bolt 10 so that the extension of the conductive wire 13 is in parallel with the rock bolt 10. Also, it may be advantageous that the conductive wire 13 is arranged on approximately the same distance from the rock bolt 10 along the length of the rock bolt 10.
  • the device 20 for determining integrity of an elongated metallic bar 10 comprises an insulation sheath 11 arranged in or on the rock bolt 10 so that the insulation sheath 11 extends from the proximal end 21 of the rock bolt 10 along the length of the rock bolt 10 towards the distal end 29 of the rock bolt 10.
  • the conductive wire 13 is arranged in the insulation sheath 11 .
  • the insulation sheath 11 hereby aids in keeping the conductive wire 13 in position along the rock bolt 10 when the device 20 has been arranged to a rock bolt 20.
  • the insulation sheath 11 also aids in keeping the conductive wire 13 electrically insulated from the rock bolt 10.
  • the conductive wire 13 is arranged in the insulation sheath 11 in such a way that the conductive wire 13 is electrically disconnected from the rock bolt 10. Further, the conductive wire 13 may be arranged movable within the insulation sheath 11 .
  • the insulation sheath 11 can be a hollow pipe.
  • the electrical signal generator 9 is arranged at the proximal end 21 of the rock bolt 10.
  • the electrical signal receiver 8 is arranged at the proximal end 21 of the rock bolt 10.
  • the electrical signal generator 9 is electrically connected to the first end 13a of the conductive wire 13 and the electrical signal receiver 8 is electrically connected to the proximal end 21 of the rock bolt 10.
  • the electrical signal generator 9 is operative for generating an electrical signal 14 and applying the generated electrical signal 14 to the first end of the conductive wire 13.
  • the electrical signal receiver 8 is operative for measuring amplitude of the returned electrical signal 15 returned in the rock bolt 10, the amplitude being measured at one or more certain time points after the applying of the electrical signal.
  • the generated electrical signal 14 is applied to the conductive wire 13 some of the electrical energy is transferred to the rock bolt 10 via a capacitive effect and/or antenna effect between the conductive wire 13 and the rock bolt 10.
  • the conductive wire 13 in parallel with the rock bolt 10 works as a capacitor. Therefore, after applying an electrical signal to the conductive wire 13, the “capacitor” comprising the conductive wire 13 and the rock bolt 10 is charged and there is an electrical signal returned in the rock bolt 10.
  • the returned electrical signal 15 abates, i.e., its amplitude is lowered over time.
  • the abating course of the returned electrical signal 15 depends on the size of the capacitor comprising the conductive wire 13 and the rock bolt 10. The longer the distance over which the conductive wire 13 and the rock bolt 10 run in parallel, i.e. the longer the unbroken conductive wire is, the slower the abating course. This will be shown in more detail in figs. 3 and 4 below. So, by measuring amplitude of the returned electrical signal at certain time points, the integrity of the rock bolt 10 can be determined. More specifically, it can be determined not just whether the rock bolt is broken or not but in case it is broken, how far from its proximal end 21 the rock bolt 10 was broken.
  • the electrical signal generator 9 is electrically connected to the proximal end 21 of the rock bolt 10 and the electrical signal receiver 8 is electrically connected to the first end 13a of the conductive wire 13.
  • the electrical signal generator 9 is operative for generating an electrical signal 14 and applying the generated electrical signal 14 to the proximal end 21 of the rock bolt 10.
  • the electrical signal receiver 8 is operative for measuring amplitude of the returned electrical signal 15 returned in the conductive wire 13.
  • the physical effects are the same as for the first embodiment. So, when the generated electrical signal 14 is applied to the rock bolt 10, some of the electrical energy is transferred to the conductive wire 13 via a capacitive effect and/or antenna effect between the conductive wire 13 and the rock bolt 10.
  • the shape of the returned electrical signal depends on the length of the remaining rock bolt 10 from the proximal end 21 up to a position where the rock bolt is broken.
  • Figs. 3 and 4 show the different shapes of pulse responses for a returned electrical signal at the proximal end of the rock bolt 10 as a result of an applied voltage pulse at the first end 13a of the conductive wire 13, or vice versa.
  • Fig. 3 shows a rock bolt 10 having a proximal end 21 and a distal end 29.
  • a rock bolt may be between 1.5 to 3 meters, and even up to 6 meters.
  • a calibration may be made after the device 20 for determining integrity has been installed to a rock bolt to handle different lengths of rock bolts and any possible outer influences on the electrical signal.
  • the device 20 for determining integrity of an elongated metallic bar is arranged to the rock bolt. However, for simplicity, only the electrical signal generator 8 and electric signal receiver 9 of the device 20 are shown in fig. 3, arranged to the proximal end 21 of the rock bolt 10. Fig. 3 shows different positions of ruptures of the rock bolt 10. The percentage numbers shown are how much of the rock bolt that is left after a rupture, or break, of the rock bolt.
  • 0 % means the rock bolt 10 is ruptured just at its proximal end and no bolt is left, 50 % means half of the rock bolt is left, 100 % means there is no rupture on the rock bolt 10.
  • fig. 4 the different shapes of the pulse responses are shown. As seen, there is large difference between the shape of the pulses. So, by analyzing the amplitude and/or time for the response pulses of the returned electrical signal, it can be determined with rather good granularity where along its length the rock bolt 10 was ruptured.
  • the amplitude of the returned electrical signal can be measured at a certain time after the applied pulse ended.
  • the amplitude of the returned electrical signal would be approximately 2.1 V. If the rock bolt 10 has a rupture at 50 % of its length, the amplitude of the returned electrical signal would be approximately 1.3 V. If the rock bolt has a rupture at 15 %, the amplitude would be only 0.1 V, etc.
  • the determining of the integrity of the rock bolt can be made by the electrical signal receiver 8 or it can be made by an external unit, remote from the rock bolt 10.
  • the measured amplitude value(s) or the determined integrity in case the electrical signal receiver 8 determines integrity, may be transmitted by the device 20 to the external unit.
  • the device 20 would then have communication means, such as a wireline or wireless transmitter, for transmitting the measured amplitude value(s) of the returned electrical signal, or the determined integrity of the rock bolt 10 to the external unit.
  • the device 20 may comprise a microcontroller 5 arranged at the proximal end of the rock bolt.
  • the microcontroller 5 may comprise the communication means.
  • the microcontroller 5 can be used to receive the measured amplitude from the electrical signal receiver 8 and transmit the measured amplitude to the external unit for integrity determination.
  • the conductive wire 13 is arranged in a groove of the rock bolt 10, the groove extending along the rock bolt 10 from its proximal end 21 to its distal end 29.
  • the conductive wire 13 is to be electrically disconnected from the elongated metallic bar 10 when arranged in the groove.
  • the insulation sheath 11 When the insulation sheath 11 is used, the insulation sheath 11 with the conductive wire 13 inside are arranged in the groove and the insulation sheath ensures that the conductive wire 13 and the rock bolt 10 do not come into electrical contact with each other.
  • the groove may be provided with an insulating material on its surface.
  • the rock bolt 10 has a through hole or interior cavity extending from its proximal end 21 to its distal end 29, and the conductive wire 13 is arranged electrically disconnected from the elongated metallic bar 10 inside the through hole or interior cavity.
  • the insulation sheath 11 When the insulation sheath 11 is used, the insulation sheath 11 with the conductive wire 13 inside are arranged in the through hole or interior cavity. The insulation sheath ensures that the conductive wire 13 and the rock bolt 10 do not come into electrical contact with each other.
  • the through hole may be provided with an insulating material on its surface.
  • the conductive wire 13 is electrically disconnectedly attached to the circumference of the rock bolt 10, and extending along the rock bolt from its proximal end 21 to its distal end 29.
  • the second end 13b of the conductive wire 13 is fastened to the distal end 29 of the rock bolt 10, however electrically disconnectedly fastened to the distal end 29 of the rock bolt 10.
  • the device 20 can also comprise a distance sensor 7 for measuring elongation of the rock bolt I case the rock bolt is stretched. The distance sensor 7 is connected to the first end 13a of the conductive wire 13. As the second end 13b of the conductive wire 13 is fastened to the distal end 29 of the rock bolt, the conductive wire 13 would follow any stretching movements of the rock bolt.
  • the distance sensor 7 would be arranged to measure such movement.
  • the distance sensor may be a potentiometer or a rotatable sensor.
  • a method for determining integrity of a rock bolt 10 comprising: mounting at least one device 20 according to any one of the preceding embodiments on the rock bolt 10; measuring amplitude of the electrical signal 15 returned in the rock bolt 10 or returned in the conductive wire 13 by means of the at least one device 20; and determining integrity of the rock bolt 10 based on the measured amplitude.
  • the determining of the integrity further comprises determining integrity based on comparing the measured amplitude and amplitude of the electrical signal applied to the conductive wire 13 or the rock bolt 10.
  • the determining of the integrity further comprises determining rupture position of the rock bolt 10 based on comparing the measured amplitude and amplitude of the electrical signal applied to the conductive wire 13 or the rock bolt 10.
  • the method further comprises determining deformation of the rock bolt 10 based on the distance of movement of the conductive wire 13 in relation to the rock bolt 10 measured by the distance sensor 7.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un dispositif (20) de détermination de l'intégrité d'un boulon d'ancrage (10). Le dispositif comprend un fil conducteur (13) conçu pour être disposé sur le boulon d'ancrage (10) de telle sorte qu'il s'étend le long de la longueur du boulon d'ancrage (10), le fil conducteur (13) devant être électriquement déconnecté du boulon d'ancrage (10). Le dispositif comprend en outre un générateur de signal électrique (9) disposé au niveau d'une extrémité proximale (21) du boulon d'ancrage (10) et opérationnel pour appliquer un signal électrique (14) à une première extrémité (13a) du fil conducteur (13). Le dispositif comprend en outre un récepteur de signal électrique (8) pour recevoir et mesurer l'amplitude d'un signal électrique de retour (15) renvoyé dans la barre métallique allongée (10), l'amplitude mesurée du signal électrique renvoyé étant utilisée pour déterminer l'intégrité de la barre métallique allongée (10).
PCT/SE2024/050634 2023-07-07 2024-06-26 Dispositifs et procédés de détermination de l'intégrité de barres métalliques allongées Pending WO2025014413A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2350868-2 2023-07-07
SE2350868A SE547604C2 (en) 2023-07-07 2023-07-07 Devices for measuring amplitude of returned electrical signals and methods for determining integrity of elongated metallic bars

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Publication Number Publication Date
WO2025014413A1 true WO2025014413A1 (fr) 2025-01-16

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WO (1) WO2025014413A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3584427B2 (ja) * 1997-06-13 2004-11-04 清水建設株式会社 構造部材のモニタリング装置
EP3218580B1 (fr) * 2014-11-13 2019-10-16 Rock Safety Sweden AB Dispositif pour un boulon d'ancrage et procédé d'utilisation du dispositif et système de renforcement comprenant un tel dispositif
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
WO2022251887A1 (fr) * 2021-05-28 2022-12-01 Innovative Mining Products (Pty)Ltd Siège sphérique modifié pour ensemble boulon d'ancrage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009216197B2 (en) * 2008-02-20 2013-12-12 National University Corporation Kobe University Device for detecting state-change of wire rod
US20130054156A1 (en) * 2011-08-31 2013-02-28 Yieldpoint Inc. Strain measuring and monitoring device
KR20190095813A (ko) * 2018-02-07 2019-08-16 강원대학교산학협력단 변위 센서를 구비하는 록볼트 장치 및 시스템

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3584427B2 (ja) * 1997-06-13 2004-11-04 清水建設株式会社 構造部材のモニタリング装置
EP3218580B1 (fr) * 2014-11-13 2019-10-16 Rock Safety Sweden AB Dispositif pour un boulon d'ancrage et procédé d'utilisation du dispositif et système de renforcement comprenant un tel dispositif
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
WO2022251887A1 (fr) * 2021-05-28 2022-12-01 Innovative Mining Products (Pty)Ltd Siège sphérique modifié pour ensemble boulon d'ancrage

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Publication number Publication date
SE547604C2 (en) 2025-10-28
SE2350868A1 (en) 2025-01-08

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