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
  • E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
  • E21D20/00—Setting anchoring-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
• • 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
  • E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid

Definitions

• the invention relates to a friction tube anchor having the features of the introductory part of claim 1.
• Such Reibrohranker brand name of Atlas Copco "Swellex" are known.
• the known friction tube anchors are rock anchors having a longitudinally inwardly folded tube which is inserted into a wellbore and expanded by increasing the pressure inside the folded tube so that the outer surface of the tube abuts the inner surface of the wellbore and thus fixes the anchor in the borehole (positive fit).
• the known Reibrohranker have a cross-sectional shape, which is shown in Fig. 1.
• the inwardly folded part of the tube has a shape that is substantially concentric with the (circular) shape of the outer part of the tube.
• an undercut due to the narrow gap at the beginning (root) of the inwardly folded part of the tube and the extension of the inwardly folded part an undercut. This undercut is problematic in several ways.
• the invention has for its object to propose an improved cross-sectional shape for Reibrohranker, which has advantages over the known Reibrohrankern.
• Fig. 1 shows the cross-sectional shape of a known Reibrohrankers (not expanded state)
• Fig. 2 shows the cross-sectional shape of a Reibrohrankers invention (not expanded state).
• the tube 1 shown in Fig. 1 in the unexpanded state of a known Reibrohrankers is a tube 1, which is produced by roll forming and which has a longitudinal weld 13.
• the outer part 3 of the tube 1 is formed in cross-section substantially circular.
• the inwardly folded, inner part 5 of the tube 1 is formed in cross-section substantially circular and approximately concentric with the outer part 3.
• the weld 13 of the mouth 7 (gap) of the inwardly folded part 5 is diametrically opposite.
• the tube 1 shown in FIG. 2 for inventive Reibrohranker has a different from the cross-sectional shape of FIG. 1 cross-sectional shape of the inwardly folded part 5 on the one hand and the position of the longitudinal weld 13 on the other.
• the inwardly folded part 5 is no longer formed as in the known tube 1 is substantially concentric with the outer part 3 of the tube 1, but deviates from this shape to the center, ie to the plane of symmetry 11 of the tube 1 out.
• lateral regions 9 of the inwardly folded part 5 subsequent to the mouth 7, which may also be wider than in the known tube 1, less strongly concave, lateral regions 9 of the inwardly folded part 5.
• areas of the inner part, the in the known tube (Fig. 1) have undercuts, not present.
• the shape of the inwardly folded part 5 in the transition regions 4 from the outer part 3 of the tube 1 in the inner part 5 results in larger radii of curvature (R3).
• the weld 13 is laterally offset from the plane of symmetry 11 of the cross-sectional shape of the tube 1, so that the weld 13 is no longer located where the inner part 5 rests against the outer part 3 of the tube 1.
• the radius R1 of the lateral wall portions 9 of the inwardly folded portion 5 of the tube 1 is greater than the radius R2 of the outer part 3 of the tube 1.
• the radius of curvature R1 of the lateral wall portions 9 of the inner Part 5 of the tube 1 in the range between at least 250% and 350%, in particular at least 280%, of the radius R2 of the outer part 3 of the tube 1 amount.
• the largest distance A of the inner sides 19 of the lateral wall portions 9 of the inner part of each other at most equal to 120% to 160% of the width B of the mouth or the gap 7.
• the largest distance A of the inner sides of the 19th at most equal to 140% of the width B of the gap 7.
• the radius of curvature R3 in the transition regions 4 from the outer part 3 in the inner part 5 of the tube 1 is greater than in the known tube (Fig. 1).
• the radius R3 of the curvature of the wall of the tube 1 in the region 4 of the gap 7, where the outer part 3 merges into the inner part 5 of the tube 1 at least equal to 20% to 40%, preferably at least equal to 30%, the radius R2 of the outer part 3 of the tube first
• the radius R4 in the region of the bottom 15 of the inner part 5 of the tube 1 at least equal to 15% to 35%, preferably at least equal to 25% of the radius R2 of the outer part 3 of Tube 1 is.
• the distance A of the inner surfaces 19 of the lateral wall portions 9 of the inner portion 5 from each other 9 mm and the mouth 7 has a width of 6.5 ⁇ 0.5 mm.
• the radius R2 of the outer part 3 of the tube 1 is 14 mm in the exemplary embodiment.
• the radius R1, with which the lateral wall parts 9 of the inner part 5 are curved, is 39 mm in the example.
• the radius with which the transition regions 4 are curved from the outer part 3 into the inner part 5, that is, the areas on both sides of the mouth 7 and the gap 7 is in the embodiment 4 ⁇ 0.5 mm.
• the inner part 5 of the tube 1 in the bottom region 15 can be curved with a radius R4 of 3.5 mm.
• a tube 1 of a Reibrohrankers has an outer part 3 and an inwardly folded inner part 5 and extending in the longitudinal direction of the tube 1 gap 7, where the outer part 3 merges into the inner part 5 of the tube 1.
• the lateral wall portions 9 of the inner part 5 are formed flat and have a shape in which the free space between the outer part 3 and the inner part 5 is substantially lenticular as in known tubes.
• the bottom 15 of the inner part 5 abuts the outer part 3 of the tube 1 and the weld 13 is laterally offset relative to the plane of symmetry 11 as the area where the bottom 15 abuts the outer part 3 of the tube 1.
• the radii of curvature R3 in the region of the transitions 4 from the outer part 3 of the tube 1 in the inner part 5 of the tube 1 are larger than in known tubes of this type.

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)
• Mutual Connection Of Rods And Tubes (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Piles And Underground Anchors (AREA)
• Joining Of Building Structures In Genera (AREA)
• Dowels (AREA)
• Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (14)

Families Citing this family (2)

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• 2009
  • 2009-09-24 AT AT0150109A patent/AT508761B1/de not_active IP Right Cessation
• 2010
  • 2010-07-01 AU AU2010300076A patent/AU2010300076A1/en not_active Abandoned
  • 2010-07-01 EP EP10744652A patent/EP2480760A2/de not_active Withdrawn
  • 2010-07-01 JP JP2012530048A patent/JP2013506064A/ja active Pending
  • 2010-07-01 RU RU2012116352/03A patent/RU2533389C2/ru not_active IP Right Cessation
  • 2010-07-01 US US13/497,355 patent/US8651769B2/en not_active Expired - Fee Related
  • 2010-07-01 BR BR112012007428A patent/BR112012007428A2/pt not_active IP Right Cessation
  • 2010-07-01 KR KR1020127009967A patent/KR20120081162A/ko not_active Application Discontinuation
  • 2010-07-01 WO PCT/AT2010/000240 patent/WO2011035353A2/de active Application Filing
  • 2010-07-01 CN CN2010800423985A patent/CN102597423A/zh active Pending
  • 2010-07-01 CA CA2772637A patent/CA2772637A1/en not_active Abandoned
  • 2010-07-12 CL CL2010000741A patent/CL2010000741A1/es unknown
• 2012
  • 2012-02-16 IL IL218151A patent/IL218151A0/en unknown
  • 2012-02-22 ZA ZA2012/01328A patent/ZA201201328B/en unknown

Non-Patent Citations (1)

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