US20180171800A1 - Shear and tensile reinforcement for inflatable bolt - Google Patents

Shear and tensile reinforcement for inflatable bolt Download PDF

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Publication number
US20180171800A1
US20180171800A1 US15/579,076 US201615579076A US2018171800A1 US 20180171800 A1 US20180171800 A1 US 20180171800A1 US 201615579076 A US201615579076 A US 201615579076A US 2018171800 A1 US2018171800 A1 US 2018171800A1
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US
United States
Prior art keywords
reinforcing member
expansion tube
inflatable
rock bolt
bushings
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.)
Abandoned
Application number
US15/579,076
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English (en)
Inventor
Mike Duffy
Mario Bureau
Chris Cranford
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.)
Epiroc Canada Inc
Original Assignee
Epiroc Canada Inc
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 Epiroc Canada Inc filed Critical Epiroc Canada Inc
Priority to US15/579,076 priority Critical patent/US20180171800A1/en
Publication of US20180171800A1 publication Critical patent/US20180171800A1/en
Abandoned legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0073Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0006Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/004Bolts held in the borehole by friction all along their length, without additional fixing means
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0046Anchoring-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
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/006Anchoring-bolts made of cables or wires

Definitions

  • the invention relates inflatable rock bolts.
  • the invention relates to reinforcement for inflatable rock bolts.
  • the invention also relates to a method for reinforcing an inflatable rock bolt.
  • Rock is removed from the ground in a number of contexts, such as in mining and tunnel construction. Voids, or cavities, are created by the removal of the rock. Underground voids formed by removing material leaves walls and ceilings of surrounding rock. The remaining surrounding rock is subject to gravity and without the removed material to support the surrounding material may tend to converge. Convergence is the decrease of tunnel size caused by gravity and relieving residual ground stresses. Controlling convergence is a critical safety activity.
  • One technique for controlling convergence includes drilling holes in the surrounding material and anchoring bolts in the material to reinforce and stabilize the material.
  • Rock bolts are anchored between stable rock deep in the hole and the surface of a void. Together, the bolts act as a field of tensile bridges that, to a certain depth, prevent the surface from fracturing and falling into the void.
  • the inflatable rock bolt is comprised of a long, folded tube welded to an end bushing and inflation bushing at each of its ends. High-pressure fluid is pumped through a small hole in the inflation bushing and inflates the folded tube inside a bore hole and tightens the tube against the wall of the hole, creating a friction and mechanical lock.
  • the bushing at one end may extend through a plate included at the rock face. The length of an inflatable bolt may be determined by structural requirements of the tunnel design.
  • the shear strength and stiffness of the inflation tube may be poor compared to other ground control devices that use solid profiles and grout and/or resin to create the bolt/ground interlock.
  • the low shear strength may be at least in part due to the thin walled material utilized to form the inflatable element(s).
  • an inflatable material is thin to have the ability to be inflated and create a compression field in surrounding rock and a friction interface along its length.
  • an inflatable bolt has a small interior cross-sectional area in which a reinforcing member may be inserted. This will make it difficult to insert and accommodate a reinforcing structure within the inflatable bolt, particularly if the reinforcing member is round.
  • inflatable bolts have a complex shape that is formed in many stages. This makes it difficult if not impossible to form the bolt around the reinforcing structure, particularly for high volume production. Additionally, inserting a reinforcing member within the inflatable bolt would be difficult if not impossible, due to the length of the bolts. For example, the reinforcing member could easily be jammed within the bold during insertion, leaving it only partially inserted.
  • the reinforcing member could also block the inflation port. As a result, the bolt would not inflate properly. Since the bolt would be inserted into a hole at this stage, the installer would have no indication that the bolt is not properly inflated.
  • the reduced surface area of the bolt to accommodate the reinforcing member would reduce the force the bolt applies on the bore hole. This would lower the bolt's grip on the rock. If the bolt surface area were maintained, the reinforcing member would be too small to make a significant increase in the bolt's performance.
  • Embodiments of the invention include an inflatable rock bolt including an expansion tube, a bushing arranged at each end of the expansion tube, and at least one reinforcing member arranged outside the expansion tube.
  • the at least one reinforcing member includes at least one of a strand extending along the expansion tube or a sleeve at least partially surrounding the expansion tube.
  • embodiments of the invention include a method for reinforcing an inflatable rock bolt.
  • the method includes extending at least one reinforcing member along an exterior surface of an expansion tube.
  • the at least one reinforcing member includes at least one of a strand extending along the expansion tube or a sleeve at least partially surrounding the expansion tube.
  • a bushing is arranged at each end of the expansion tube.
  • the expansion tube and at least reinforcing member are inserted into a hole.
  • the expansion tube is expanded, thereby frictionally clamping the at least one reinforcing member between the expansion tube and a wall of the hole in which the bolt is inserted.
  • FIG. 1 represents a perspective view of an embodiment of an inflatable bolt and reinforcing structure
  • FIG. 2 represents a transverse cross-sectional view of embodiment of an inflatable bolt and reinforcing structure
  • FIG. 3 represents a longitudinal cross-sectional view of the embodiment shown in FIG. 2 along the lines 3 - 3 ;
  • FIG. 4 close-up perspective view of an end of the embodiment of an inflatable bolt and reinforcing structure shown in FIGS. 2 and 3 ;
  • FIG. 5 represents a cross-sectional view of an embodiment of an inflatable bolt and reinforcing structure prior to inflation of the bolt;
  • FIG. 6 represents a cross-sectional view of the embodiment shown in FIG. 5 subsequent to inflation of the bolt
  • FIG. 7 represents a cross-sectional view of another embodiment of an inflatable bolt and reinforcing structure prior to inflation of the bolt;
  • FIG. 8 represents a cross-sectional view of the embodiment shown in FIG. 7 subsequent to inflation of the bolt
  • FIG. 9 represents a perspective view of a further embodiment of an inflatable bolt and reinforcing structure prior to inflation of the bolt;
  • FIG. 10 represents a perspective view of the embodiment shown in FIG. 9 subsequent to inflation of the bolt
  • FIG. 11 represents a perspective view of an embodiment of a clamp for securing an inflatable bolt and reinforcing structure together and to a bushing of the inflatable bolt;
  • FIG. 12 represents an end view of the embodiment of the clamp shown in FIG. 11 ;
  • FIG. 13 represents a cross-sectional view of the embodiment of the claims shown in FIG. 12 along the line 13 - 13 ;
  • FIG. 14 represents a perspective view of an embodiment of a clamp insert
  • FIG. 15 represents an end view of the clamp insert shown in FIG. 14 ;
  • FIG. 16 represents a longitudinal cross-sectional view of the clamp insert shown in FIG. 15 along the line 16 - 16 ;
  • FIG. 17 represents a perspective view of an embodiment of a clamp ring
  • FIG. 18 represents an end view of the embodiment of the clamp ring shown in FIG. 17 ;
  • FIG. 19 represents a cross-sectional view of the embodiment of the clamp ring shown in FIG. 18 along the line 19 - 19 ;
  • FIG. 20 represents a perspective view of an embodiment of a clamp cup
  • FIG. 21 represents an end view of the embodiment of the clamp cup shown in FIG. 20 ;
  • FIG. 22 represents a cross-sectional view of the embodiment of the clamp cup shown in FIG. 21 along the line 22 - 22 .
  • Inflatable bolts may have limited shear strength and stiffness as compared to solid, non-inflatable bolts and/or bolts utilizing grout and/or resin.
  • Loading to a rock bolt may also include sliding of fracture planes inside the walls or ceiling. Such fracturing can impose large shear loading to bolts, particularly to the thin walled material utilized in the inflatable member. Divergently moving planes of rock will apply force in different directions to directly adjacent regions of the inflatable bolt. If shear loading is not resisted adequately the bolt can deform excessively in the shear and fail. This is a very dangerous situation because not only is a failed bolt no longer bearing load, but failure of a bolt in a rock formation is difficult or impossible to detect.
  • the thin walled material utilized to form inflatable bolts may also result in the bolts having low stiffness.
  • Embodiments of the reinforcement structure may provide enhanced shear and/or tensile resistance for inflatable bolts.
  • the reinforcement structure may increase shear strength and/or shear stiffness.
  • the reinforcement structure may dramatically increase strength of inflatable blots, such as on the order of about doubling the shear and tensile strength.
  • the reinforcement provides additional strength along the length of the thin walled inflatable section.
  • Embodiments of the reinforcement do not require resin or grout. Additionally, embodiments of the reinforcement may be utilized with existing inflatable bolts. Embodiments of the reinforcement may be installed on existing inflatable bolt designs before or during installation of the bolts.
  • Embodiments of the reinforcing structure may increase tensile strength of an inflatable bolt far beyond industry standard for a given bore hole size.
  • a bolt with increased tensile strength and stiffness can reduce tunnel convergence. Additional shear capacity can prevent internal rock shifting and resulting bolt failure due to shear. In some cases, the capacity to withstand shear and tensile forces may be doubled as compared to inflatable bolts with reinforcement.
  • Embodiments of the reinforcement may include at least one reinforcement element arranged on an exterior surface of an inflatable bolt.
  • Some embodiments of the reinforcement may include at least one strand arranged on the exterior of the inflatable bolt.
  • the strand could include a wire, rope, rod, cylinder or cable.
  • the strand could be rigid or non-rigid.
  • the strand could be hollow or solid. If the strand is hollow, it could be filled with a material.
  • the strand could be a single element or made up of many strands, such a rope.
  • the strand could be slack, to provide passive support, or taught, to as to be pre-tensioned upon inflation of the bolt to provide active support.
  • the strand could be made of steel, carbon fiber or any other suitable material. If steel is utilized, the steel could be high-tensile steel wire. One example is CrSi wire. Alternatively, a steel rope or cable could be utilized. If carbon fiber is utilized, the carbon fiber could be in the form of a rope. Any suitable material could be utilized in any suitable form to provide additional tensile and/or shear reinforcement. Also, more than one strand could be utilized. The strands could all be of the same material or differing materials. Similarly, the strands could all have the same form or be of different forms.
  • Any strand typically will be thicker than the thin walled material utilized in the inflatable bolt. This will make the strand better able to resist shear and tensile forces. Additional strength may come from forming the strand of multiple elements or strands to form a rope or cable. A thicker and stronger material will be much better able to resist shear forces such as from fracturing planes. The strand may also be better able to resist tensile forces applied to an inflatable bolt by shifting rock formation.
  • an inflatable bolt has a shape that is generally U-shaped or a horseshoe shape.
  • a reinforcing strand could be arranged anywhere about the exterior surface of the inflatable bolt.
  • a reinforcing strand is arranged in the U or horseshoe shape. This may help to maintain the position of the strand as the bolt is inflated.
  • FIG. 5 illustrates a cross-sectional view of an embodiment of a strand arranged with an inflatable bolt prior to inflation of the bolt.
  • FIGS. 1-6 illustrate one embodiment of a reinforcement structure and an inflatable bolt.
  • the reinforcement structure according to this embodiment includes a strand 1 .
  • an inflatable bolt includes a bushing 3 at each end of an inflatable segment 4 .
  • the reinforcing structure 1 could extend through the bushings as shown in FIGS. 1-4 .
  • the reinforcement structure may extend to the bushings 2 and 3 . It is possible that the reinforcement structure may not extend all the way to the bushings.
  • the reinforcement structure may extend between the bushings. It is also possible that ends of the reinforcement structure may be secured differently, such as one end extending through the bushing and one end extending to the bushing.
  • FIG. 5 illustrates a cross-sectional view of the embodiment shown in FIGS. 1-4 prior to inflation of the bolt.
  • FIG. 6 illustrates the embodiment subsequent to inflation of the bolt by introducing an inflation medium into the interior 4 a of the inflatable member.
  • the rock formation 5 would surround and be in contact with the inflatable member and the reinforcement member.
  • FIGS. 7-10 An alternative embodiment of the reinforcement member is shown in FIGS. 7-10 .
  • the alternative embodiment may include a tube or sleeve 6 that extends at least partially around the inflatable member.
  • the embodiment of the sleeve shown in FIG. 7 does not extend entirely about the bolt. Therefore, the ends 7 of the sleeve 6 form a slit 8 .
  • the slit permits the sleeve to expand.
  • the split tube opens to allow expansion and is trapped between the expandable bolt and a wall of the borehole.
  • FIG. 8 illustrates an embodiment of a sleeve extending around an inflatable bolt. With the bolt inflated to a maximum inflated state, the sleeve typically extends about at least one-half of the circumference of the inflatable bolt.
  • the slit tube sleeve may be slipped over the length of the expansion tube.
  • FIGS. 9 and 10 illustrate an embodiment of a reinforcing sleeve 6 that is a complete cylinder that extends entirely around the inflatable member.
  • the sleeve includes a mesh structure. As the bolt is inflated, the mesh expands.
  • the sleeve or tube may be solid or a mesh.
  • a number of different materials may be utilized to form the sleeve or tube.
  • the sleeve or tube could be made of steel, fiberglass or carbon fiber.
  • the sleeve or tube could be made of a woven material.
  • a number of other high-strength materials could also be utilized. If a bolt is exposed to shearing forces, the tube or sleeve provides additional shear capacity.
  • the reinforcement structure could be secured to the inflatable bolt.
  • the reinforcement could be glued to the inflatable bolt.
  • the reinforcement structure could also be welded to the inflatable bolt. Securing the reinforcement structure to the inflatable bolt could provide additional shear resistance. As the inflatable element is inflated, the reinforcement member may be held in place by friction between the rock on the surface of the hole and the inflatable member.
  • the bushings may at least partially clamp the reinforcement structure to the inflatable bolt.
  • the reinforcement structure could be secured only to the bushings and not to the inflatable bolt.
  • the reinforcement structure may be held in place at least partially by forces between the bolt and the wall of the hole in which the bolt and reinforcement structure are inserted. Additionally or alternatively, the reinforcing structure could be mechanically fastened to at least some portion of the inflatable bolt structure.
  • the reinforcement structure is mechanically fastened, it could be at least partially fastened with a friction or knot interlock. Such connections could provide both shear and tensile strength. If the reinforcement structure extends protrudes into or extends through the end bushings. The mechanical friction fastener may be engaged to the strand after insertion in the bushing.
  • the mechanical faster may be configured to engage the end bushings as the bolt elongates under load.
  • the mechanical fasten may apply the tensile loading capacity of the reinforcing structure between the end bushings.
  • holding the reinforcing structure in place provides shear load capacity.
  • a load condition causing a large shear deformation may result in the reinforcing structure connecting the bushings through a longer route, thereby incurring an addition tension force between each bushing, compressing the entire bolt.
  • the reinforcing structure is non-rigid, such as a cable, the reinforcing structure may be slack for passive support upon inflation, or taught then pre-tensioned upon inflation for active support.
  • FIGS. 11-22 illustrate elements of an embodiment of a friction fastener to mechanically fasten a reinforcing structure to the bushing.
  • FIG. 11 illustrates a complete assembled fastener.
  • This embodiment is a cable clamp including a cup 9 , a clamp 10 , and a clamp ring 11 .
  • FIG. 9 illustrates an end view of the embodiment shown in FIG. 8 and FIG. 10 illustrates a cross-sectional view.
  • the clamp 10 directly contacts the reinforcing structure.
  • the reinforcing structure secured by such an embodiment of a fastener is a strand.
  • the strand extends into or through the clamp.
  • the clamp 10 has an interior diameter that is slightly larger than a diameter of the strand. This permits the strand to slide through the clamp.
  • the clamp includes at least one slit 6 a that extends through the thickness of the clamp body and partially along the length of the clamp body.
  • the at least one slit 12 collapses around the strand, thereby clamping the strand. This may happen as the fastener is assembled and/or as the strand is placed in tension during use.
  • the outer diameter of the clamp may be larger at the end 13 including the opening of the at least one slit and narrower at the other, opposite, end 14 . This may also cause the at least one slit 12 to collapse as the clamp is drawn into the cup 9 .
  • the clamp 10 is received by a cup 9 .
  • the cup 9 has an outer surface 15 that may be contoured at one end.
  • the embodiment shown in FIGS. 11, 13, 21 and 22 is rounded at one end 16 . This may facilitate engaging the cup 9 with the bushing 2 , 3 .
  • the rounded surface 17 may also provide a joint that permits the fastener and strand to move as the rounded surface of the cup moves on the surface of the bushing opening.
  • the remaining portion 18 of the exterior surface of the typically has a diameter similar to the diameter of the bushing. This may facilitate insertion of the structure in a hole.
  • the interior surface 19 of the cup 9 may include different contoured portions.
  • the interior surface may include an angled portion 20 that is angled similar to the exterior surface of the clamp 10 . This may facilitate insertion of the clamp and fixing of the clamp in the cup.
  • the interior surface of the cup may also include a curved portion 21 . The curved portion may help to hold the clamp once inserted.
  • the angled and curved portions of the interior surface of the cup may compress the clamp as the clamp is drawn into the cup to help clamp the strand, particular, as the inflatable bolt and strand experience tension and shear forces.
  • the fastener may also include a clamp ring 11 .
  • the clamp ring 11 may be fit around the portion of the clamp that extends from the cup 9 .
  • the clamp ring 11 may have an internal surface 22 having a diameter that is smaller than at least a portion of the external diameter of the clamp 10 .
  • the clamp 10 may be inserted into the clamp ring 11 and then into the cup 9 . Openings of the clamp ring 11 may include a chamfer 23 to facilitate inserting the clamp into the clamp ring. As the clamp is inserted into the cup, the at least one slot in the clamp ring will be collapsed to clamp the strand.
  • a tensile strand may be fixed only through inflation of the inflatable bolt and may not be fixed to end bushings.
  • the tensile strand 1 may be routed through the inflation profile 4 such that the strand does not protrude into the end bushings 2 and 3 .
  • the strand may be glued or mechanically fastened in place for ease of shipping or installation. Such a strand may provide a significant increase in the shear capacity of the bolt in the event of a load condition causing large shear deformation.

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  • 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)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Piles And Underground Anchors (AREA)
  • Joining Of Building Structures In Genera (AREA)
US15/579,076 2015-07-10 2016-07-06 Shear and tensile reinforcement for inflatable bolt Abandoned US20180171800A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/579,076 US20180171800A1 (en) 2015-07-10 2016-07-06 Shear and tensile reinforcement for inflatable bolt

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201562191040P 2015-07-10 2015-07-10
PCT/CA2016/050789 WO2017008147A1 (fr) 2015-07-10 2016-07-06 Renfort de cisaillement et de traction pour boulon gonflable
US15/579,076 US20180171800A1 (en) 2015-07-10 2016-07-06 Shear and tensile reinforcement for inflatable bolt

Publications (1)

Publication Number Publication Date
US20180171800A1 true US20180171800A1 (en) 2018-06-21

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ID=57756653

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/579,076 Abandoned US20180171800A1 (en) 2015-07-10 2016-07-06 Shear and tensile reinforcement for inflatable bolt

Country Status (8)

Country Link
US (1) US20180171800A1 (fr)
EP (1) EP3320179A4 (fr)
BR (1) BR112017028280A2 (fr)
CA (1) CA2988185A1 (fr)
CL (1) CL2017003335A1 (fr)
MX (1) MX2017016281A (fr)
PE (1) PE20180749A1 (fr)
WO (1) WO2017008147A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112281833A (zh) * 2020-11-20 2021-01-29 南京工程学院 一种具有抗剪能力锚杆应力计结构及其安装方法

Citations (7)

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US4696606A (en) * 1985-06-17 1987-09-29 Atlas Copco Aktiebolag Method of stabilizing a rock structure
CZ20003670A3 (cs) * 2000-10-05 2002-05-15 Ankra, Spol. S R. O. Třecí horninový svorník
DE102004006872A1 (de) * 2004-02-12 2005-09-01 Carbotech Fosroc Gmbh Reibrohranker mit erhöhter Bruchlast
US20060204341A1 (en) * 2003-05-12 2006-09-14 Morgan Kanflod Method and device for rock bolting
US20110002746A1 (en) * 2009-06-12 2011-01-06 Dywidag-Systems International Pty Limited Method of Assessing a Multilayer Strata for Rock Bolt Installation
US20120301228A1 (en) * 2011-05-27 2012-11-29 Taenzer Lars Rock Bolt
CA2872252A1 (fr) * 2012-05-22 2013-11-28 Atlas Copco Canada Inc. Boulon d'ancrage et procede d'installation d'un boulon d'ancrage

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SE427764B (sv) * 1979-03-09 1983-05-02 Atlas Copco Ab Bergbultningsforfarande jemte rorformig bergbult
SE8106165L (sv) * 1981-10-19 1983-04-20 Atlas Copco Ab Forfarande for bergbultning och bergbult
EP0637676A4 (fr) * 1993-01-26 1996-04-18 Sergei Alexeevich Logashkin Etai de soutien conformable.
CZ20001439A3 (cs) * 2000-04-20 2001-12-12 Zdeněk Ujka Horninový svorník s vícedílným opláštěním
WO2007023363A1 (fr) * 2005-08-23 2007-03-01 Pieter Schalk Mulder Boulon extensible
AT502825B1 (de) * 2006-01-19 2007-06-15 Atlas Copco Mai Gmbh Fluidrückgewinnung
WO2008031120A1 (fr) * 2006-09-14 2008-03-20 Atlas Copco Mai Gmbh Ancre protégée contre la corrosion
CZ305105B6 (cs) * 2009-12-28 2015-05-06 Geofinal, S.R.O. Horninová expanzní kotva
WO2011087948A1 (fr) * 2010-01-14 2011-07-21 Anthony John Spencer Spearing Boulon expansible taraudeur
CN204282361U (zh) * 2014-12-11 2015-04-22 湖南科技大学 一种带钢丝网的软土地基充气锚杆

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696606A (en) * 1985-06-17 1987-09-29 Atlas Copco Aktiebolag Method of stabilizing a rock structure
CZ20003670A3 (cs) * 2000-10-05 2002-05-15 Ankra, Spol. S R. O. Třecí horninový svorník
US20060204341A1 (en) * 2003-05-12 2006-09-14 Morgan Kanflod Method and device for rock bolting
DE102004006872A1 (de) * 2004-02-12 2005-09-01 Carbotech Fosroc Gmbh Reibrohranker mit erhöhter Bruchlast
US20110002746A1 (en) * 2009-06-12 2011-01-06 Dywidag-Systems International Pty Limited Method of Assessing a Multilayer Strata for Rock Bolt Installation
US20120301228A1 (en) * 2011-05-27 2012-11-29 Taenzer Lars Rock Bolt
CA2872252A1 (fr) * 2012-05-22 2013-11-28 Atlas Copco Canada Inc. Boulon d'ancrage et procede d'installation d'un boulon d'ancrage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112281833A (zh) * 2020-11-20 2021-01-29 南京工程学院 一种具有抗剪能力锚杆应力计结构及其安装方法

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Publication number Publication date
EP3320179A1 (fr) 2018-05-16
WO2017008147A1 (fr) 2017-01-19
EP3320179A4 (fr) 2019-03-13
BR112017028280A2 (pt) 2018-09-04
MX2017016281A (es) 2018-04-20
CL2017003335A1 (es) 2018-04-20
CA2988185A1 (fr) 2017-01-19
PE20180749A1 (es) 2018-04-27

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