WO2011113131A1 - A yielding spiral bolt appendage for a rock bolt - Google Patents
A yielding spiral bolt appendage for a rock bolt Download PDFInfo
- Publication number
- WO2011113131A1 WO2011113131A1 PCT/CA2010/000382 CA2010000382W WO2011113131A1 WO 2011113131 A1 WO2011113131 A1 WO 2011113131A1 CA 2010000382 W CA2010000382 W CA 2010000382W WO 2011113131 A1 WO2011113131 A1 WO 2011113131A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- appendage
- rock
- bolt
- rock bolt
- resin
- Prior art date
Links
- 239000011435 rock Substances 0.000 title claims abstract description 84
- 239000011347 resin Substances 0.000 claims abstract description 40
- 229920005989 resin Polymers 0.000 claims abstract description 40
- 238000003780 insertion Methods 0.000 claims abstract description 18
- 230000037431 insertion Effects 0.000 claims abstract description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 238000005755 formation reaction Methods 0.000 description 12
- 238000005065 mining Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- E21D20/025—Grouting with organic components, e.g. resin
- E21D20/026—Cartridges; Grouting charges
-
- 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
Definitions
- This invention relates in general to the field of mining and construction and particularly to ground support equipment and specifically to a yielding spiral bolt appendage for a rock bolt.
- a resin is used to adhere the yielding tendon to the rock.
- the resin is a binary type of adhesive contained in cartridges comprising a bonding agent and a hardening catalyst. Once the capsules are pierced the bonding agent and catalyst mix and the resin begins to set.
- the resin cartridge(s) is inserted into a predrilled hole that passes through an unstable rock formation into a stable rock formation.
- a rock bolt is inserted into the drilled hole.
- the exposed end of the rock bolt that extends outside of the drilled hole is typically equipped with a nut for connection to a rotating device.
- the insertion end is often tipped with an apparatus to pierce the resin cartridges and mix the resin as the rock bolt is being rotated. It is important to the strength of the bond between the rock bolt, the resin and the rock body that the mixing be thorough. Less than adequate mixing will result in a weakened rock bolt installation.
- Hipkins discloses an anchor bolt assembly including a helical coil external of and connected to a bolt shaft that is coupled to the end of the rock bolt.
- the tip of the bolt shaft has a frustoconical plug that is used to pierce the resin cartridges as the bolt is rotated to mix the resin.
- the disadvantage associated with the Hipkins apparatus is that it is a relatively complicated apparatus and hence expensive to manufacture and use in the quantities necessary for rock bolting a major excavation.
- the Hipkins device comprises a coupler to couple the apparatus to the rock bolt, the helical coil welded to the outside of the apparatus and the frustoconical plus at the head of the apparatus.
- the coupler itself may present a possible yield point when the assembly is under tension during rock displacement.
- a spiral bolt appendage for a rock bolt comprising a body having a shank portion for attachment to the rock bolt integral with a helical flute portion for acting on a resin system placed within a drill hole.
- the appendage is threaded onto the end of a rock bolt.
- the appendage is welded to the end of a rock bolt.
- the body is cast from a suitable metal alloy such as hardened steel.
- the body is forged.
- the helical flute portion may be welded to the shank portion.
- the helical flute portion comprises an one-half pitch helix.
- the helical flute portion may be longer than one-half pitch to suit the installation requirements.
- the shank portion comprises a bore having a closed end and an open end for receiving an end of the rock bolt.
- the bore includes a threaded portion for threaded attachment with the end of the rock bolt.
- the shank portion comprises a cylinder having a first tapered portion and a second tapered portion and an apex between the two tapers.
- a rock bolt comprising a tension member comprising a first end for insertion into a predrilled hole in a rock formation and a second end disposed outside of the predrilled hole having a nut for attachment to a rotating machine.
- a rock bolting system comprising at least one resin cartridge for placement into a predrilled hole in a rock formation, a rock bolt comprising a tension member having an insertion end having a spiral bolt attached thereto for insertion into the predrilled hole and for piercing the resin cartridge thereby releasing and mixing the resin so that it sets adjacent to the spiral bolt.
- the tension member exposed end is disposed outside of the predrilled hole for attachment to a rotating machine for rotating the tension member and thereby mixing the resin
- Figure 1 is a diagram of one preferred embodiment of the invention attached to a rock bolt and installed in a drilled hole.
- Figure 2 comprises a side view of the invention ' ⁇ ', a top view of the invention 'B' and a bottom view of the invention 'C.
- Figure 3 is a cross -sectional view of the invention along its axis.
- Figure 4 is a perspective view of the invention.
- FIG. 1 there is shown one embodiment of the invention, a spiral bolt appendage for a rock bolt 10, installed in a drilled hole 2 in order to fix an unstable rock formation 3 to a stable sub-parallel rock formation 4.
- the invention 10 is attached to the end of a rock bolt 5 and embedded in a resin 6 to fix the rock bolt to the rock formation.
- the appendage may be threaded to the end of the rock bolt as described herein or it may be welded to the end of the thread bolt in alternate embodiments.
- the portion of the rock bolt that extends outside of the drilled hole 2 includes a nut 7 and a bearing plate 8. The nut is tightened against the bearing plate by a rotating device (not shown) to tension the rod.
- View 'A' is a side view of the invention.
- View 'B' is a top view of the invention and
- view 'C is a bottom view of the invention.
- the invention has a length 12, a width 20 and an axis 18 about which is it rotated.
- the invention comprises a body 10 that is cast from a suitable metal capable of withstanding the forces applied to the body.
- the metal is a hardened steel alloy. Other alloys are possible.
- the body can be forged.
- the body 10 is cast per ASTM 536 grade 120-90-02.
- the body 10 is comprised of a fluted section 14 and a cylindrical shank section 16.
- the fluted section 14 has a top surface 22 having a width 24 that is adequate to pierce resin cartridges placed in a drilled hole.
- the fluted section 14 can be welded to the shank portion 16.
- the bottom 30 of the fluted section 14 is integral to the top surface 28 of the shank portion 16.
- the bottom 32 of the shank portion 16 comprises a bored hole 30 in which the bottom end of the rock bolt is inserted in a threaded arrangement.
- the body is welded to the bottom of the rock bolt.
- first taper that is represented by angle 17 that extends from the apex line 38 to the top 28 of the shank 16.
- angle 19 that extends from apex line 38 to the bottom 32 of the shank 16.
- the tapers have been found to further improve the yielding characteristics of the rock bolt and resin. Referring back to Figure 1, the tapers are embedded in the resin 6. Taper 17 and taper 19 will resist tensioning forces attempting to push the rock bolt further into the drilled hole or pull the rock bolt out of the drilled hole. The tapers transfer more of the yielding forces to the resin and thereby slow the yielding of the rock bolt.
- the first taper 17 angle is 0.7 degrees and the second taper 19 angle is 1.5 degrees. Other angles can also be used.
- the length of the body 12 is preferably 3.25 inches with the shank 16 being preferably 2.25 inches long and the fluted portion 14 being one inch long.
- the width of the shank 16 at end 32 is preferably 0.78 inches and at apex 38 the width of the shank is preferably 0.82 inches.
- the width 24 of tip 22 is preferably 0.25 inches and the width of the fluted portion at its maximum is 0.78 inches.
- the flute section 14 comprises a one-half pitch helix and in a preferred embodiment the pitch of the helix is 2 inches. Other dimensions are possible to suit a particular rock bolt installation.
- FIG 3 there is shown (in Figure 3) a cross-section along axis 18 one preferred embodiment of the invention 10 comprising the shank portion 16 and the fluted portion 16.
- the first taper 17 extends along length 39 from apex 38 to the top of the shank portion 28.
- the second taper 19 extends along length 36 from apex 38 to the end 32 of the shank portion 16.
- Bore 30 is illustrated as extending from end 32 of the shank substantially to the top of the shank.
- the inside surface of the bore 40 is threaded to accept the threaded end of the rock bolt.
- FIG. 4 there is shown a perspective view of the body 10 comprising the fluted section 14 and the shank portion 16.
- the first taper extends from apex 38 along length 39 to the top of the shank portion and the second taper extends from apex 38 along length 36 to the bottom 32 of the shank portion.
- the inside surface 40 is threaded to mesh with the end of the rock bolt to which the body is attached.
- the thread is 3/4- 10 UNC 2B LH.
Landscapes
- 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)
- Piles And Underground Anchors (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/143,922 US20130004245A1 (en) | 2010-03-19 | 2010-03-19 | Yielding Spiral Bolt Appendage for a Rock Bolt |
CA2767209A CA2767209C (en) | 2010-03-19 | 2010-03-19 | A yielding spiral bolt appendage for a rock bolt |
PCT/CA2010/000382 WO2011113131A1 (en) | 2010-03-19 | 2010-03-19 | A yielding spiral bolt appendage for a rock bolt |
AU2010348888A AU2010348888B2 (en) | 2010-03-19 | 2010-03-19 | A yielding spiral bolt appendage for a rock bolt |
EP10847636A EP2547867A1 (en) | 2010-03-19 | 2010-03-19 | A yielding spiral bolt appendage for a rock bolt |
MX2012002391A MX2012002391A (en) | 2010-03-19 | 2010-03-19 | A yielding spiral bolt appendage for a rock bolt. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CA2010/000382 WO2011113131A1 (en) | 2010-03-19 | 2010-03-19 | A yielding spiral bolt appendage for a rock bolt |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011113131A1 true WO2011113131A1 (en) | 2011-09-22 |
Family
ID=44648375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2010/000382 WO2011113131A1 (en) | 2010-03-19 | 2010-03-19 | A yielding spiral bolt appendage for a rock bolt |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130004245A1 (en) |
EP (1) | EP2547867A1 (en) |
AU (1) | AU2010348888B2 (en) |
CA (1) | CA2767209C (en) |
MX (1) | MX2012002391A (en) |
WO (1) | WO2011113131A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103321663A (en) * | 2013-02-28 | 2013-09-25 | 新汶矿业集团有限责任公司 | Roadway baseboard anchoring and top pouring type pre-stressed anchor cable strengthening device and construction method |
WO2013152393A1 (en) * | 2012-04-10 | 2013-10-17 | Wmc Nominees Pty Limited | Rock bolt resin mixer |
US9513355B2 (en) | 2012-04-27 | 2016-12-06 | Siemens Aktiengesellschaft | Controlling a magnetic resonance system |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101858225B (en) * | 2010-06-10 | 2011-10-12 | 北京中矿深远能源环境科学研究院 | Constant resistance and large deformation anchor rod |
CN108775253A (en) * | 2018-06-26 | 2018-11-09 | 辽宁工程技术大学 | A kind of damping energy-absorption anchor rod pallet |
USD922864S1 (en) * | 2019-03-14 | 2021-06-22 | Epiroc Drilling Tools Ab | Resin anchored rock bolt |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1271374A (en) * | 1969-02-18 | 1972-04-19 | Ici Ltd | Improvements relating to anchor bolts and methods of installing same |
US3698196A (en) * | 1970-03-04 | 1972-10-17 | Bergwerksverband Gmbh | Method for reinforcing loose rock and coal |
US4693638A (en) * | 1986-04-22 | 1987-09-15 | Unrug Konstanty F | Roof bolt assembly having a sealing plug for preventing a deterioration of the mine roof |
CA2576116A1 (en) * | 2006-01-31 | 2007-07-31 | Raytheon Utd Incorporated | Rock bolt with grout flow geometry |
CN101424190A (en) * | 2007-10-29 | 2009-05-06 | 王光平 | Special-shaped wall integral anchor rod |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3332244A (en) * | 1964-10-28 | 1967-07-25 | American Cyanamid Co | Reinforcing bolts |
US3942329A (en) * | 1975-02-11 | 1976-03-09 | The United States Of America As Represented By The Secretary Of The Interior | Flexible rock bolt |
IT1290040B1 (en) * | 1997-03-07 | 1998-10-19 | Marcegaglia S P A | METHOD FOR STABILIZATION OF ROCKS AND RELATIVE STABILIZER ELEMENT |
GB2404710B (en) * | 2000-12-21 | 2005-04-20 | William Henry Ollis | Masonry anchor and method for installing a masonry anchor |
AU2003904006A0 (en) * | 2003-08-01 | 2003-08-14 | Garford Pty Ltd | Improved cable bolt |
US7510350B2 (en) * | 2006-04-13 | 2009-03-31 | Thomas Ronnkvist | Helical anchor with hardened coupling sections |
WO2008060211A1 (en) * | 2006-11-15 | 2008-05-22 | Sandvik Intellectual Property Ab | A rock bolt and an anchoring device |
CA2605208A1 (en) * | 2007-03-09 | 2008-09-09 | Agnico-Eagle Mines Limited | Bolt assembly |
-
2010
- 2010-03-19 CA CA2767209A patent/CA2767209C/en active Active
- 2010-03-19 AU AU2010348888A patent/AU2010348888B2/en not_active Ceased
- 2010-03-19 EP EP10847636A patent/EP2547867A1/en not_active Withdrawn
- 2010-03-19 MX MX2012002391A patent/MX2012002391A/en not_active Application Discontinuation
- 2010-03-19 US US13/143,922 patent/US20130004245A1/en not_active Abandoned
- 2010-03-19 WO PCT/CA2010/000382 patent/WO2011113131A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1271374A (en) * | 1969-02-18 | 1972-04-19 | Ici Ltd | Improvements relating to anchor bolts and methods of installing same |
US3698196A (en) * | 1970-03-04 | 1972-10-17 | Bergwerksverband Gmbh | Method for reinforcing loose rock and coal |
US4693638A (en) * | 1986-04-22 | 1987-09-15 | Unrug Konstanty F | Roof bolt assembly having a sealing plug for preventing a deterioration of the mine roof |
CA2576116A1 (en) * | 2006-01-31 | 2007-07-31 | Raytheon Utd Incorporated | Rock bolt with grout flow geometry |
CN101424190A (en) * | 2007-10-29 | 2009-05-06 | 王光平 | Special-shaped wall integral anchor rod |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013152393A1 (en) * | 2012-04-10 | 2013-10-17 | Wmc Nominees Pty Limited | Rock bolt resin mixer |
US9513355B2 (en) | 2012-04-27 | 2016-12-06 | Siemens Aktiengesellschaft | Controlling a magnetic resonance system |
CN103321663A (en) * | 2013-02-28 | 2013-09-25 | 新汶矿业集团有限责任公司 | Roadway baseboard anchoring and top pouring type pre-stressed anchor cable strengthening device and construction method |
Also Published As
Publication number | Publication date |
---|---|
US20130004245A1 (en) | 2013-01-03 |
EP2547867A1 (en) | 2013-01-23 |
AU2010348888B2 (en) | 2014-01-09 |
AU2010348888A8 (en) | 2013-12-19 |
CA2767209C (en) | 2013-08-13 |
AU2010348888A1 (en) | 2012-03-22 |
MX2012002391A (en) | 2012-04-02 |
CA2767209A1 (en) | 2011-09-22 |
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