WO2018096507A1 - Boulon d'ancrage auto-foreur accouplé - Google Patents

Boulon d'ancrage auto-foreur accouplé Download PDF

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Publication number
WO2018096507A1
WO2018096507A1 PCT/IB2017/057413 IB2017057413W WO2018096507A1 WO 2018096507 A1 WO2018096507 A1 WO 2018096507A1 IB 2017057413 W IB2017057413 W IB 2017057413W WO 2018096507 A1 WO2018096507 A1 WO 2018096507A1
Authority
WO
WIPO (PCT)
Prior art keywords
drilling
segment
rock
rock bolt
segments
Prior art date
Application number
PCT/IB2017/057413
Other languages
English (en)
Inventor
John Francis Neville JOHNSON
Original Assignee
Orica Mining Services South Africa (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 Orica Mining Services South Africa (Pty) Ltd filed Critical Orica Mining Services South Africa (Pty) Ltd
Publication of WO2018096507A1 publication Critical patent/WO2018096507A1/fr

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
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • 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
    • E21D21/0053—Anchoring-bolts in the form of lost drilling rods

Definitions

  • This invention relates to a coupled self-drilling rock bolt.
  • the invention relates to a coupled self-drilling rock bolt wherein the coupling is achieved by internal tapered screw thread.
  • Rock bolts are commonly used for the strengthening of rock, typically the rock surrounding underground excavations or behind free-standing rock surfaces such as in road cuttings or rock faces.
  • a rock bolt is a long anchor bolt that transfers load from an unstable exterior to the confined (and much stronger) interior of the rock mass.
  • holes are drilled in the rock to receive the rock bolts.
  • Rock bolts are then secured or established in the holes by grouting with resin or cementitious fillers, by friction between the surfaces of the rock bolts and the rock walls of the holes, or a combination of grouting and friction.
  • Self-drilling rock bolts are also known whereby the rock bolt serves as the drill as well as the rock bolt.
  • the various types and forms of rock bolts can be classified as follows:
  • the coupled, self-drilling rock bolt category can be further divided into the following sub-categories:
  • This particular invention relates to a coupled self-drilling rock bolt with internally tapered screw thread.
  • one of the bolt segments may define a sleeve by having an end-portion of increased diameter, with the end-portion having an internal female threaded portion that engages with a corresponding male threaded portion of another segment of the bolt.
  • the threads of the male and female connectors are parallel-sided.
  • the disadvantage of the increased diameter sections of the bolts is that the drilled hole diameter must be increased to accommodate the coupling. This increases drilling time and also increases the volume of grout that must be used to secure the bolt inside the hole.
  • a coupled self-drilling rock bolt for use with a two-component grout mixture for setting the rock bolt in a hole in a rock body, the rock bolt including: a drilling segment comprising a tubular body having a first, drilling end and a second, connecting end;
  • a connecting segment comprising a tubular body having a first, connecting end and an opposed second end, wherein the connecting ends of the drilling and connecting segments carry complementary shaped engagement formations for, in use, engaging each other so as to form an engaged section, wherein complementary shaped engagement formations are configured such that the diameter of the engaged sections of the segments is substantially the same or smaller than the diameter of the tubular bodies of the segments, and wherein the drilling and connecting segments each has an axial interior passage running between its first and second ends, such that the passages define a continuous internal fluid flow path along which the grout mixture, in use, flows when the segments are connected, and
  • a mixer for mixing the two-component grout, the mixer being located at least partially within the internal passage of either the drilling or connecting segments such that the mixer is located in the fluid flow path.
  • the second end of the connecting segment may carry an engagement formation that is complementary shaped to the engagement formation carried at the first end of the connecting segment, thereby allowing two connecting segments to be connected to each other.
  • the coupled self-drilling rock bolt may include a plurality of connecting segments.
  • the complementary shaped engagement formations carried by the drilling and connecting segments may be tapered threads.
  • the tapered threads may be are in the form of buttress threads.
  • the tapered threads have an inclination angle of about 5 degrees.
  • the engagement formation at the second end of the drilling segment may be a female tapered thread and the engagement formation at the first end of the connecting segment may be a male tapered thread.
  • the engagement formation at the second end of the drilling segment may be a male tapered thread and the engagement formation at the first end of the connecting segment may be a female tapered thread.
  • the tubular bodies of the drilling and connecting segments may carry riblike deformations on their exterior surfaces.
  • the first, drilling end of the drilling segment terminates in a drill bit.
  • the first, drilling end of the drilling segment is shaped to engage a removable drill bit.
  • a drilling segment for a coupled self-drilling rock bolt for use with a multi- component grout mixture for setting the rock bolt in a hole in a rock body
  • the drilling segment including a tubular body having a first, drilling end and a second, connecting end, wherein the connecting end carries a tapered thread for, in use, engagement with a complementary shaped tapered thread on another section of the coupled self-drilling rock bolt, wherein the diameter of the connecting end is substantially the same or smaller than the diameter of the tubular body, and wherein the drilling segment has an axial interior passage running between its first and second ends such that the passages define a continuous internal fluid flow path along which the grout mixture, in use, flows.
  • the tapered thread may be in the form of a buttress thread.
  • the tapered thread may further have an inclination angle of about 5 degrees.
  • the drilling segment may include a mixer for mixing the multi-component grout, the mixer being located at least partially within the internal passage such that the mixer is located in the fluid flow path.
  • the tubular body preferably carries rib-like deformations on its exterior surface.
  • first, drilling end of the drilling segment terminates in a drill bit. In another embodiment the first, drilling end of the drilling segment is shaped to engage a removable drill bit.
  • a connecting segment of a coupled self-drilling rock bolt for use with a multi- component grout mixture for setting the rock bolt in a hole in a rock body
  • the connecting segment including a tubular body having a first, connecting end and an opposed second end, wherein the connecting end caries a tapered thread for, in use, engagement with a complementary shaped tapered thread on another section of the coupled self-drilling rock bolt, wherein the diameters of the first, connecting end and the second end are substantially the same or smaller than the diameter of the tubular body, and wherein the connecting segment has an axial interior passage running between its first and second ends, such that the passages define a continuous internal fluid flow path along which the grout mixture, in use.
  • the second end a tapered tread that is complementary shaped to the tapered carried at the first end, thereby allowing two connecting segments to be connected to each other.
  • the tapered threads are preferably in the form of buttress threads.
  • the tapered threads may further have an inclination angle of about 5 degrees.
  • the connecting segment may include a mixer for mixing the multi- component grout, the mixer being located at least partially within the internal passage such that the mixer is located in the fluid flow path.
  • the tubular body preferably carries rib-like deformations on its exterior surfaces.
  • a method of installing a coupled self-drilling rock bolt including: i) attaching the second, connecting end of the drilling segment to a drive mechanism;
  • the method may further include the following steps between steps (vi) and vii):
  • Steps x) to xii) may be repeated until a rock bolt of desired length is obtained.
  • the segments may be engaged with one another by means of a threaded connection, preferably a tapered threaded connection.
  • the drilling segment may be driven into the rock face until the portion protruding from the hole in the rock face is about 50mm in length.
  • the connecting segment may be driven into the rock face until the portion protruding from the hole in the rock face is 50mm.
  • the grout mixture may be pumped through the axial passages of the segments and into an annulus between the bolt and the hole in the rock face, thereby fixing the bolt in the hole.
  • the drive mechanism is a rotary drive mechanism.
  • a coupled self-drilling rock bolt for use with a grout for setting the rock bolt in a hole in a rock body, the rock bolt including:
  • a drilling segment comprising a tubular body having a first, drilling end and a second, connecting end;
  • a connecting segment comprising a tubular body having a first, connecting end and an opposed second end, wherein the connecting ends of the drilling and connecting segments carry tapered buttress threads for, in use, engaging each other so as to form an engaged section, wherein the buttress threads are configured such that the diameter of the engaged sections of the segments is substantially the same or smaller than the diameter of the tubular bodies of the segments, and wherein the drilling and connecting segments each has an axial interior passage running between its first and second ends, such that the passages define a continuous internal fluid flow path along which the grout mixture, in use, flows when the segments are connected.
  • Figure 1 shows a side view of a rock bolt in accordance with the invention in use being installed in a rock face.
  • Figure 2 shows a side exploded view of the rock bolt of Figure 1 ;
  • Figure 3 shows a side view of the assembled rock bolt of Figure 1 ;
  • Figure 4 shows an exploded cross-sectional view of the rock bolt of Figure 1 ;
  • Figure 5 shows a cross-sectional view of the rock bolt of Figure 1 with its internal threaded formations visible;
  • Figure 6 shows an exploded perspective view of a connecting segment of the rock bolt of Figure 1 ;
  • Figure 7 a cross-sectional side view of the connecting of Figure 6.
  • the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings and are thus intended to include direct connections between two members without any other members interposed therebetween and indirect connections between members in which one or more other members are interposed therebetween. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings. Additionally, the words “lower”, “upper”, “upward”, “down” and “downward” designate directions in the drawings to which reference is made. The terminology includes the words specifically mentioned above, derivatives thereof, and words or similar import.
  • Figure 1 shows the coupled self-drilling rock bolt 10 in use in a rock face 100 intended for reinforcing a rock mass.
  • the rock bolt 10 is separated into different segments (12, 14, 16) which are in use axially coupled together to create a rock bolt 10 of desired length.
  • a single rock bolt 10 is made up of at least a drilling segment 12 and a connecting segment (16, 14).
  • Each segment (12, 14, 16) of the rock bolt 10 comprises a tubular body 18 with an internal bore in the form of an axial hollow internal passage 20 and an external surface 22 carrying rib-like deformations 24 for increasing the contact strength between the rock bolt 10 and grout after installation of the bolt in the rock face 100.
  • the rib-like deformations 24 are essentially in the form of upstanding ribs protruding from the exterior surface of the body 12.
  • the ribs are arranged in at least one row in which they are aligned parallel to one another. In the illustrated embodiment the ribs are arranged in two substantially diametrically opposed rows.
  • the rock bolt 10 could serve as both the drilling formation or drill steel and a rock bolt.
  • the drilling segment 12 has a first end 12.1 , which is in use a distal end, terminating in a drill bit 26, preferably made of tungsten carbide, suitable for penetrating rock.
  • a drill bit 26 is shown to be integrally formed with the body of the drilling segment 12, it should be understood that in an alternative embodiment not illustrated in the accompanying drawings the drill bit 26 and drilling segment 12 could be separate components carrying complementary connecting formations for connecting the drill bit to the drilling segment.
  • the connection formations could form a wedge-type connection or threaded connection, for example.
  • the drilling segment 12 further has a second end 12.2, which is, in use, a proximal end, carrying a threaded engagement formation.
  • the engagement formation is an internal tapered thread socket, which is probably best seen in the cross-sectional view of Figure 5.
  • the internal tapered thread socket 12.2 forms a female portion of a male- female connection created by the segment-to-segment coupling between two adjacent segments of the rock bolt 10 when assembled.
  • the male- female couplings are indicated by the numeral 28 in Figures 5 and 6.
  • FIGS 6 and 7 show a typical connecting segment 14 of the rock bolt 10 according to the invention.
  • the connecting segment 14 comprises a tubular body having a first end 14.1 , which is in use a distal end, threaded engagement formation.
  • the engagement formation is a tapered, externally threaded formation which forms the male portion of the male-female connection created by the male-female couplings 28 between adjacent segments. From the drawings it should be clear that the male tapered threaded formation 12.1 in use engages the threaded engagement formation at the second end 12.2 of the drilling segment 12.
  • the connecting segment 14 further comprises a second end 14.2 defining a second threaded engagement formation in the form of an internal threaded socket.
  • the internally threaded socket carried at its second end 14.2 is shaped complementary to the externally threaded engagement formation at its first end 14.1 .
  • the internally threaded socket carried at its second end 14.2 is similar to the threaded socket 12.2 carried by the drilling formation 12.
  • multiple connecting segments can be connected to one another to construct a rock bolt 10 of desired length. It should therefore be understood that one or more connecting segments 14 may be used.
  • outermost connecting segment of the rock bolt 10 is referred to as the end segment 16 located, in use, at least partially outside the borehole.
  • the end segment 16 again has a first end 16.1 , which is in use a distal end, carrying a threaded engagement formation.
  • the engagement formation at its first end 16.1 is similar to the externally threaded engagement formation carried at the first end 14.1 of the connecting segment 14. Accordingly, the male tapered threaded formation 14.1 can, in use, be connected to the threaded socket located at the second end 14.2 of the connecting segment 14.
  • the end section 16 further has a second end 16.2, which is in use a proximal end, configured to receive grout from grout injection means 30.
  • the segments (12, 14, 16) have axial flow passages 20 which align when the segments are coupled together to form the rock bolt 10.
  • the aligned passages create a continuous longitudinal passage which defines a fluid flow path along which the grout is, in use, pumped.
  • the grout injection means 30 is connected to the end segment 16 by means of a drive mechanism 32. More about this is said below.
  • the grout is delivered as a two-component grout.
  • the rock bolt 10 includes a mixer 34.
  • the mixer 34 is a static mixer located at least partially within the body of one of the segments such that it is located in the fluid flow path created by the aligned internal passages 20.
  • the mixer 28 is located completely inside the body of the connecting segment 14.
  • the mixer 34 could be located in any of the segments (12, 14, 16), for example the end segment 16.
  • the mixer 34 includes a number of individual mixing elements 36 which are receivable in a capsule 38.
  • the capsule 38 is in the form of an aluminium tube shaped to contain the individual mixing elements 36.
  • the individual mixing elements 36 are made from a plastics material and are referred to as X-type mixers. It has been found that this X-type mixer provides good mixing over a relatively short distance, despite the high viscosity of the fluids constituting the two-component resin grout.
  • the mixer 34 includes 10 mixing elements 36, which each has a length of about 10 mm. Accordingly, the overall length of the mixer 34 is about 100 mm.
  • the mixer could be in the form of a single, integrally formed mixing element which spans the entire length of the mixer 34.
  • the capsule 38 may be discarded seeing that the capsule is mainly included in the illustrated rock bolt 10 to facilitate handling of the individual mixing elements 36.
  • it may not be necessary to pre-load the mixing element into a capsule.
  • the capsule 38 is receivable in a recess 40 within the body of the connecting segment 14.
  • the recess 40 is enlarged compared to the axial passage 20 in order to receive the capsule 38.
  • the diameter of the recess is about 13 mm.
  • the capsule 38 containing the mixing elements 36 is located at the proximal end 14.2 of the connecting segment when located in the recess 40.
  • the mixing elements 36 are tight-fitting in the capsule 38 and that the capsule 38 is in turn tight- fitting in the recess 40.
  • the static mixer 34 is a single-use item that can simply be retained in the segment 14 and, accordingly, the rock bolt 10 after use.
  • threaded engagement formations of the male-female couplings 28 between adjacent segments are configured such that the diameter of the engaged couplings 28 is substantially the same or smaller than the outer diameter of the tubular bodies of the segments (12, 14, 16).
  • the drilling segment 12 is attached to the drive mechanism 32, for example a drill, by means of the internal tapered thread at its second end 12.2. It is envisaged that the drive mechanism 32 will screw directly into the internal tapered thread formation 12.2. The drill bit 26 at the first end 12.1 of the drilling segment 12 is then engaged against a rock surface 100 at the desired location and the drive mechanism 32 is activated.
  • the drive mechanism 32 for example a drill
  • the drive mechanism 32 is preferably a rotary drive mechanism but it is envisaged that a percussion drive mechanism may also be used for the drilling operation.
  • the drilling segment 12 is rotated by the drive mechanism 32, and the drill bit 26 at the distal end 12.1 of the drilling segment 12 bores into the rock face 100.
  • the drilling segment 12 is bored into the rock face until, in this example, about 50mm of the second end 12.2 of the segment 12 protrudes from the hole in the rock.
  • the drive mechanism 32 is disengaged from the internal tapered thread of the second end 12.2 of the drilling segment 12.
  • the drive mechanism 32 is preferably disengaged by reversing the drive mechanism and holding the drilling segment 12 stationary, thereby unscrewing the drive mechanism from the drilling segment.
  • a connecting segment 14 is then attached to the drive mechanism 32 by means of the internal tapered thread at its second end 14.2.
  • the male tapered thread at the first end 14.1 of the connecting segment 14 is then screwed into the complementary internal or female tapered thread at the second end 12.2 of the drilling segment 12.
  • the drive mechanism 32 is actuated, and the connecting segment 14 is rotated until the male tapered thread 14.1 is fully engaged with the internal tapered thread 12.2 of the drilling segment 12.
  • Both segments (14, 14) are then rotated in harmony by the drive mechanism 32.
  • the drill bit 26 at the distal end 12.1 of the drilling segment 12 continues to bore into the rock until, in this example, about 50mm of the second end 14.2 of the connecting segment 14 protrudes from the hole in the rock.
  • one or more connecting segments 14 may be coupled in order to drill to the desired depth into the rock with the outermost connecting segment forming the end segment 16. It should be clear that the same procedure is followed when connecting any successive connecting segments 14 until the desired depth is reached.
  • the second end of the connecting segment 16 carries a connecting formation (not shown in the accompanying drawings) to be connectable to the grout injection means 32.
  • the grout injection means 30 injects grout through the continuous longitudinal passage 20 defined by the bores of the segments (12, 14, 16) and is dispensed from the bolt 10 to fill the annulus between the bolt and the rock surface defining the hole.
  • the grout is preferably a fast-setting resin grout such as Carbothix, which is a fast-setting, two-component silicate resin grout manufactured by Minova Carbotech GmbH.
  • the amount of grout required to fix the bolt 10 in the hole is substantially decreased due to the use of the internal tapered thread couplings, which are configured such that the outer diameter of the engaged sections are substantially the same or smaller than the outer diameter of the tubular bodies of the segments (12, 14, 16).
  • known coupled rock bolts make use of external couplings such as a sleeve or bolt section which requires a greater diameter of the drilled hole to accommodate the coupling. This leads to slower drilling time and an increase in the volume of grout required to fix the known bolts in the hole.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention porte sur un boulon d'ancrage auto-foreur accouplé destiné à être utilisé avec un mélange de coulis à deux constituants pour fixer le boulon d'ancrage dans un trou dans un corps de roche. Le boulon d'ancrage comprend un segment de forage et au moins un segment de raccordement. Le segment de forage est doté d'un corps tubulaire qui est doté d'une première extrémité de forage et d'une seconde extrémité de raccordement. Le segment de raccordement est également doté d'un corps tubulaire qui est doté d'une première extrémité de raccordement et d'une seconde extrémité opposée. Les extrémités de raccordement des segments de forage et de raccordement comportent des formations de mise en prise de forme complémentaire pour, lors de l'utilisation, se mettre en prise l'une avec l'autre de façon à former une section en prise. Les formations de mise en prise de forme complémentaire sont conçues de telle sorte que le diamètre des sections en prise des segments soit sensiblement le même ou plus petit que le diamètre des corps tubulaires des segments. Les segments de forage et de raccordement sont chacun dotés d'un passage intérieur creux axial s'étendant entre ses première et deuxième extrémités, de telle sorte que les passages définissent un trajet d'écoulement de fluide interne continu le long duquel le mélange de coulis, lors de l'utilisation, s'écoule lorsque les segments sont raccordés. Le boulon comprend en outre un mélangeur pour mélanger le coulis à deux constituants. Le mélangeur est situé au moins partiellement à l'intérieur du passage interne du segment de forage et/ou de raccordement de telle sorte que le mélangeur soit situé dans le trajet d'écoulement de fluide. L'invention concerne également un procédé de fixation d'un boulon d'ancrage auto-foreur accouplé dans un trou foré dans un corps de roche.
PCT/IB2017/057413 2016-11-28 2017-11-27 Boulon d'ancrage auto-foreur accouplé WO2018096507A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2016/08231 2016-11-28
ZA2016/08231A ZA201608231B (en) 2016-11-28 2016-11-28 Coupled self-drilling rock bolt

Publications (1)

Publication Number Publication Date
WO2018096507A1 true WO2018096507A1 (fr) 2018-05-31

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ZA (1) ZA201608231B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE1951078A1 (sv) * 2019-09-24 2021-03-25 Drillpipe Ab Metod för förstärkning av bergvolym genom förbultning medelst topphammarborrmaskin, borrmodul för sagda förbultning samt användning av sagda topphammarborrmaskin för förbultning

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1574005A (fr) * 1968-04-01 1969-07-11 Lamendin Louis Perfectionnement aux tiges d'ancrage pour galeries de mines
US4523880A (en) * 1982-05-14 1985-06-18 H. Weidmann, Ag Tie rod assembly for rock borehole anchor
JPH0579278A (ja) * 1991-09-19 1993-03-30 Tokai Rubber Ind Ltd 岩盤固結工法
JP2001234690A (ja) * 2000-02-24 2001-08-31 Bridgestone Corp 地山の固結方法
WO2003025345A1 (fr) * 2001-09-14 2003-03-27 Celtite Pty Ltd Controle des strates
US20070264088A1 (en) * 2004-10-21 2007-11-15 Archibald Richter Method for Embedding Rock Anchors
US20160326873A1 (en) * 2015-05-08 2016-11-10 Normet International, Ltd. Locally Anchored Self-Drilling Hollow Rock Bolt

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1574005A (fr) * 1968-04-01 1969-07-11 Lamendin Louis Perfectionnement aux tiges d'ancrage pour galeries de mines
US4523880A (en) * 1982-05-14 1985-06-18 H. Weidmann, Ag Tie rod assembly for rock borehole anchor
JPH0579278A (ja) * 1991-09-19 1993-03-30 Tokai Rubber Ind Ltd 岩盤固結工法
JP2001234690A (ja) * 2000-02-24 2001-08-31 Bridgestone Corp 地山の固結方法
WO2003025345A1 (fr) * 2001-09-14 2003-03-27 Celtite Pty Ltd Controle des strates
US20070264088A1 (en) * 2004-10-21 2007-11-15 Archibald Richter Method for Embedding Rock Anchors
US20160326873A1 (en) * 2015-05-08 2016-11-10 Normet International, Ltd. Locally Anchored Self-Drilling Hollow Rock Bolt

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE1951078A1 (sv) * 2019-09-24 2021-03-25 Drillpipe Ab Metod för förstärkning av bergvolym genom förbultning medelst topphammarborrmaskin, borrmodul för sagda förbultning samt användning av sagda topphammarborrmaskin för förbultning
SE543656C2 (sv) * 2019-09-24 2021-05-18 Drillpipe Ab Metod för förstärkning av bergvolym genom förbultning medelst topphammarborrmaskin, borrmodul för sagda förbultning samt användning av sagda topphammarborrmaskin för förbultning

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