EP2961928B1 - Dispositif de détection de présence d'une ou plusieurs cavités dans un trou de forage - Google Patents

Dispositif de détection de présence d'une ou plusieurs cavités dans un trou de forage Download PDF

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Publication number
EP2961928B1
EP2961928B1 EP14757785.2A EP14757785A EP2961928B1 EP 2961928 B1 EP2961928 B1 EP 2961928B1 EP 14757785 A EP14757785 A EP 14757785A EP 2961928 B1 EP2961928 B1 EP 2961928B1
Authority
EP
European Patent Office
Prior art keywords
measurement
passage
tube
medium
borehole
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.)
Not-in-force
Application number
EP14757785.2A
Other languages
German (de)
English (en)
Other versions
EP2961928A4 (fr
EP2961928A1 (fr
Inventor
Leif Gustafsson
Sture ÅBERG
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.)
Rock Safety Sweden AB
Original Assignee
Rock Safety Sweden 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 Rock Safety Sweden AB filed Critical Rock Safety Sweden AB
Publication of EP2961928A1 publication Critical patent/EP2961928A1/fr
Publication of EP2961928A4 publication Critical patent/EP2961928A4/fr
Application granted granted Critical
Publication of EP2961928B1 publication Critical patent/EP2961928B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting
    • E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • 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

Definitions

  • the present invention concerns an arrangement for detecting the presence of one or more cavities in a borehole
  • a large number of reinforcement systems are today available to stabilise and reinforce a rock structure during the building of tunnels, mining operations, tunnelling, etc.
  • Such a reinforcement system involves the drilling of a large number of boreholes in the wall or roof that is to be reinforced, the subsequent filling of these boreholes with grout, and the subsequent introduction of bolts into the boreholes, to be cast in place in the boreholes, by which means the wall or roof is reinforced.
  • a bolt for casting into a reinforcement system is what is popularly called the "kiruna bolt”, which consists of a reinforcement bar with a slotted end with a wedge.
  • a cable bolt which consists of a 7-stranded twisted steel thread. These types of bolt have lengths of 3-7 metres.
  • the rock reinforcement is carried out through a portion of the grout being injected into a borehole by a nozzle, normally a tube.
  • the borehole is filled from the deepest part of the borehole bottom, after which the tube is withdrawn, as filling continues.
  • Rock material may be constituted in different ways: cracks and natural cavities are sometimes present that are filled by an injected portion of filler material. This means that the portion of grout that has been injected may be insufficient to fix the rock bolt, which may have as its consequence that the reinforcement system is deficient and has an insufficient load-bearing capacity.
  • the rock bolt is introduced into what appears to be a filled hole, there may, therefore, arise empty spaces or cavities, along the bolt that are difficult to detect.
  • SE 533769 reveals a reinforcement means, a rock bolt, that has a passage for the introduction of a medium into the borehole.
  • the passage is provided with radially directed holes, openings, through which the medium flows if there is a cavity at the outer surface of the passage. This results in a change in pressure that can be measured, and that indicates that a cavity is present in the immediate vicinity of the reinforcement means.
  • the reinforcement means is introduced into a borehole shortly after the borehole has been filled with unhardened filler material that risks penetrating through the holes, the openings, in the passage wall.
  • the holes, the openings being provided with a covering surface layer, a cover of a thin layer of a material, a rubber sheet, a plastic film, or a thin membrane of paint or tape.
  • the cover is pressed away from the holes, and penetrates out if a cavity is present.
  • the protective cover is normally destroyed, independently of whether there is a cavity present or not. This means that if a cavity is not present, and the protective cover has been destroyed by being put under pressure, the filler material can penetrate into the opening. Thus the filler material risks clogging the passage, which cannot then be used for the intended purpose. This risks influencing the measurement result.
  • One purpose of the present invention is to achieve an arrangement for the detection of the presence of a cavity in a borehole, which arrangement solves the problems with filler material that penetrates into the measurement passage.
  • Figure 1 shows schematically an arrangement 1 according to the invention.
  • the arrangement is intended to be used for the detection of the presence of a cavity 2 in a borehole 3 that has been made in a rock structure 4 during tunnel construction, mining, tunnelling or similar according to the method revealed in SE 533769.
  • the borehole 3 is intended for the reception of a reinforcement means, a rock bolt 5.
  • the reinforcement means, the rock bolt 5, comprises a separate measurement tube 6.
  • the measurement tube has a passage 7 that is intended to introduce a pressurised medium 8 into a borehole that has been filled or partially filled by hardening grout 16.
  • the measurement tube 6 is constituted by a thin, hollow tube that is open in its longitudinal direction, made from, for example, semi-rigid flexible plastic, or semi-rigid flexible rubber that has a certain elasticity.
  • semi-rigid is here used to describe a flexible material that has the ability to regain essentially its original form after the effect of a force on the material has ceased.
  • the measurement tube may, for example, be made from polyamide or polyurethane, or a combination of these. Such materials are particularly suitable for this purpose, but are not limiting for the invention.
  • the semi-rigid aspect relates to the transverse stability, when the measurement tube is bent or influenced in its transverse direction it afterwards regains its original form.
  • the measurement tube has a tube wall 9, the thickness of which is selected such that an externally applied load from hardening grout 16 or similar does not influence the function of the passage 7.
  • the measurement tube 6 with the passage 7 is provided with a passage opening at at least one tube end, where the passage opening at the surface of the rock structure is intended for the introduction of a medium into the borehole.
  • the diameter of the tube is considerably less that the diameter of the reinforcement means, the rock bolt, but it has essentially the same length, or is longer than the rock bolt. The length of the tube thus exceeds the depth of the borehole.
  • the measurement tube has an inner end 10 that is located in the vicinity of the bottom end 11 of the rock bolt and the bottom 12 of the borehole, and it has a contact end (not shown in the drawings) that extends out from the borehole.
  • the measurement tube is attached to the reinforcement means with one or several fastening arrangements 13.
  • the fastening arrangements 13 are, for example, regularly distributed at points along the length of the rock bolt and the tube.
  • the fastening arrangements consist, for example, of ties, tape, steel wire or similar.
  • the measurement tube 6 with the passage 7 may be attached to the rock bolt 5 during manufacture of the bolt, in particular if the reinforcement means is an independent rock bolt, for example a kiruna bolt. If the reinforcement member 5 is a twisted bolt, the length of the bolt is adapted immediately before the rock reinforcement operation is carried out.
  • the bolt is manufactured from metal, for example steel.
  • the measurement tube 6 with the passage 7 is then attached to the rock bolt just before the rock bolt with the measurement tube is introduced into, pressed into, the borehole filled with hardening grout.
  • the contact end of the measurement tube is available for its connection to measuring equipment (not shown in the drawings) for the supply of medium under pressure and the detection of a change in pressure in the medium in the event of the presence of a cavity along the rock bolt, for example such equipment as is shown in SE 533769.
  • the measurement tube 6 with the passage 7 is provided with at least one means 14 for the supply of a measurement medium 8 to the borehole 3, where the means 14 acts as a valve and has a valve function that is activated by the application of pressure, when measurement medium under pressure is supplied to the passage 7.
  • the means 14 is designed as a cut, a section,that penetrates the wall 9 of the tube, through the side surface of the passage.
  • the means 14, the cut has two cut surfaces 15a, 15b that make contact with each other. In their uninfluenced condition, the cut surfaces 15a, 15b are in contact with each other, and seal the cut. No material has been removed from the tube in the cut surfaces.
  • the measurement tube consists of a plastic material of a semi-rigid type, and this has the effect that the means, the cut, acts as a valve.
  • the means 14 is in this way arranged to be opened when placed under pressure from the inside of the passage 7.
  • the means 14 When the measurement tube 6 with the passage 7 is supplied with a medium 8 under pressure the means 14, the cut, opens and the cut surfaces 15a, 15b are pressed apart such that an opening, a passage, arises between the cut surfaces, as is shown in Figure 1 b.
  • the passage is united with the outer surface of the wall of the tube when the pressurised medium is supplied. If a cavity is present at the outer surface of the measurement tube, the medium 8 under pressure will be pressed out, and this results in a change in pressure that can be measured, which indicates the presence of a cavity, an empty space, along the rock bolt 5.
  • cut surfaces 15a, 15b being pressed apart is that, if there is a thin membrane of solidified grout outside of the measurement tube 6, this membrane can be burst by the pressure in the measurement medium 8 that has been supplied.
  • the force that influences the cut corresponds to the pressure multiplied by the area of the passage.
  • the cut has a considerably greater area of passage than, for example, the holes or perforations that have been previously suggested. The force, and thus the bursting ability, is for this reason greater.
  • the means 14 When the passage 7 is not being supplied with medium under pressure, the means 14, the cut, remains closed.
  • the means is thus arranged to be closed in a condition in which measurement medium under pressure is not supplied. This has the effect that unhardened grout is essentially fully prevented from pressing in through the means and sealing the passage 7.
  • it is not necessary to cover the opening with any cover, which saves a lot of time and will be significantly more cost-efficient.
  • the means 14 has in this way a valve function that, furthermore, essentially allows the transport of medium in only one direction.
  • the means thus acts as a non-return valve, and has an effect as that of a non-return valve that allows measurement medium 8 supplied under pressure to be transported out from the passage 7 through the open means 14, but prevents unhardened grout from entering the passage 7 when the means 14 is closed and the passage 7 is not being supplied with a medium 8 under pressure.
  • the means opens only when the pressure in the pressurised medium 8 that is supplied exceeds a certain limiting value.
  • the possibility of controlling the means is in this way obtained.
  • the measurement tube be provided with several means 14, cuts, distributed along its complete length and circumference.
  • the measurement tube is provided with several means along its length, in particular in the region close to its inner end, since it is more common that cavities arise at the inner end, close to the bottom of the borehole.
  • the contact end of the measurement tube is connected during measurement to measuring equipment of the type that is described in SE 533769 (not shown in the drawings).

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)
  • Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • External Artificial Organs (AREA)

Claims (6)

  1. Dispositif (1) de détection de la présence d'une cavité (2) dans un trou de forage (3) destinée à recevoir un moyen de renforcement comprenant un tube de mesure (6) avec un passage (7), le tube de mesure (6) comportant au moins un moyen (14) d'alimentation d'un milieu de mesure (8) vers le trou de forage (3), dans lequel le moyen est caractérisé en comprenant une coupe agencée à travers la paroi (9) du tube, ladite coupe ayant deux surfaces de coupe (15a, 15b) qui entrent en contact l'une avec l'autre, dans lequel ledit moyen (14) fonctionne comme une soupape qui est activée par l'application de pression lorsque le milieu de mesure (8) est fourni au passage (7), et dans lequel le moyen (14) n'est ouvert que lorsque la pression dans le milieu fourni dépasse une certaine valeur de seuil.
  2. Dispositif selon la revendication 1, dans lequel le moyen (14) est disposé au niveau de la paroi de tube (9) du tube de mesure et est ouvert lors de l'alimentation du milieu (8).
  3. Dispositif selon la revendication 1 ou 2, dans lequel le moyen (14) est disposé de manière à être fermé lorsqu'aucun milieu de mesure (8) n'est fourni.
  4. Dispositif selon l'une quelconque des revendications 1 à 3, dans lequel le moyen agit comme un clapet antiretour, le moyen (14) étant ouvert au moment de l'alimentation du milieu de mesure (8) sous pression et permettant au milieu de mesure sous pression d'être évacué à travers le moyen ouvert à partir d'un passage (7) disposé dans le tube de mesure (6), et que le moyen est fermé lorsque le milieu de mesure sous pression n'est pas alimenté, ce qui empêche le mortier d'entrer dans le passage (7).
  5. Dispositif selon l'une quelconque des revendications 1 à 4, dans lequel le matériau du tube de mesure (6) comprend une matière plastique semi-rigide.
  6. Dispositif selon l'une quelconque des revendications 1 à 5, dans lequel le tube de mesure est muni d'un grand nombre de moyens (14) répartis sur toute la longueur du tube de mesure (6).
EP14757785.2A 2013-02-28 2014-02-28 Dispositif de détection de présence d'une ou plusieurs cavités dans un trou de forage Not-in-force EP2961928B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1350239A SE537019C2 (sv) 2013-02-28 2013-02-28 Anordning för detektering av förekomst av en eller flera kaviteter i ett borrhål
PCT/SE2014/050249 WO2014133449A1 (fr) 2013-02-28 2014-02-28 Dispositif de détection de présence d'une ou plusieurs cavités dans un trou de forage

Publications (3)

Publication Number Publication Date
EP2961928A1 EP2961928A1 (fr) 2016-01-06
EP2961928A4 EP2961928A4 (fr) 2016-09-21
EP2961928B1 true EP2961928B1 (fr) 2018-03-28

Family

ID=51428590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14757785.2A Not-in-force EP2961928B1 (fr) 2013-02-28 2014-02-28 Dispositif de détection de présence d'une ou plusieurs cavités dans un trou de forage

Country Status (4)

Country Link
EP (1) EP2961928B1 (fr)
CL (1) CL2015002411A1 (fr)
SE (1) SE537019C2 (fr)
WO (1) WO2014133449A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE538499C2 (sv) * 2014-11-13 2016-08-09 Rock Safety Sweden Ab Anordning för bergbult och förfarande för användning av anordningen samt förstärkningssystem innefattande sådan anordning.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE544161A (fr) * 1955-03-24
US3234742A (en) * 1962-07-05 1966-02-15 Chester I Williams Groutable rock bolt assembly and procedure
JPS5689700A (en) * 1979-12-18 1981-07-21 Kubota Ltd Locking bolt
ZA200405176B (en) * 2003-06-30 2005-04-26 Csir Method and apparatus for testing installation quality in a grouted anchor system
SE533769C2 (sv) 2009-05-06 2010-12-28 Malmfaelten Ab Förfarande, system, användning av system jämte förstärkningsorgan vid bergförstärkning
AU2012203548A1 (en) * 2011-06-20 2013-01-10 Nikki Gadd Plug Device and Method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
SE537019C2 (sv) 2014-12-02
EP2961928A4 (fr) 2016-09-21
SE1350239A1 (sv) 2014-08-29
WO2014133449A1 (fr) 2014-09-04
EP2961928A1 (fr) 2016-01-06
CL2015002411A1 (es) 2016-07-08

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