AU2009273761A1 - A method of encasing a yielding rock bolt shaft - Google Patents
A method of encasing a yielding rock bolt shaft Download PDFInfo
- Publication number
- AU2009273761A1 AU2009273761A1 AU2009273761A AU2009273761A AU2009273761A1 AU 2009273761 A1 AU2009273761 A1 AU 2009273761A1 AU 2009273761 A AU2009273761 A AU 2009273761A AU 2009273761 A AU2009273761 A AU 2009273761A AU 2009273761 A1 AU2009273761 A1 AU 2009273761A1
- Authority
- AU
- Australia
- Prior art keywords
- shaft
- sheath
- debonding
- rock bolt
- encased
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 23
- 239000011435 rock Substances 0.000 title claims description 15
- 238000002788 crimping Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
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
-
- 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
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Description
WO 2010/009506 PCT/AU2009/000938 "A METHOD OF ENCASING A YIELDING ROCK BOLT SHAFT" BRIEF DESCRIPTION OF THE INVENTION 5 The present invention relates to a method of encasing a yielding rock bolt shaft. FIELD OF THE INVENTION In International Patent Application Number WO 2004/055327 there is described and claimed a yielding rock bolt comprising a shaft which is arranged to be inserted into a 10 rock body. The yielding rock bolt of Patent Application Number WO 2004/055327 preferably comprises a debonding sheath mounted about the shaft to prevent the shaft from bonding to other material such as resin. In placing a debonding sheath over the shaft of a yielding rock bolt difficulties have been 15 encountered. For example, it is known to use manual methods to place a debonding sheath over a shaft of a yielding rock bolt but this has proved to be time consuming and labour intensive. Further, the sheath may be damaged during the process of fitting. Any damage to, or 20 malfunction of, the sheath undermines the function of the sheath in preventing bonding of the shaft with resin or other material. The present invention attempts to overcome at least in part the aforementioned disadvantages of the prior art. 1 WO 2010/009506 PCT/AU2009/000938 SUMMARY OF THE INVENTION In accordance with the present invention there is provided a method of encasing a shaft, to be used in a yielding rock bolt, with a debonding sheath, which comprises mounting 5 the shaft securely, passing the debonding sheath through mechanical feed means and feeding the debonding sheath onto the shaft. DESCRIPTION OF THE DRAWINGS The present invention will now be described, by way of example, with reference to the 10 accompanying drawings, in which: Figure 1 is a perspective view of a shaft used in production of a yielding rock bolt; Figure 2 is a perspective view of a means to sheathe a shaft in accordance with the 15 method of the present invention; Figure 3 is a perspective view similar to figure 2 showing a means to cut a debonding sheath encasing a shaft in accordance with the method of the present invention; 20 Figure 4 is a perspective view showing the fitting of a means to fix to a debonding sheath in position on a shaft in accordance with the present invention; and Figure 5 is a perspective view of a shaft fitted with a debonding sheath and fixed in accordance with the present invention. 2 WO 2010/009506 PCT/AU2009/000938 DESCRIPTION OF THE INVENTION In the drawings, there is shown a solid metal shaft 10 having two ends, one with a threaded portion 12. The shaft 10 is placed on a preformed channel, not shown, with a 5 stopper 16 at a distal end and a means to sheathe disposed at a proximal end, as shown in figure 2. The stopper 16 may be adjusted in position longitudinally and fixed at a suitable position required for the length of the yielding rock bolt produced. Yielding rock bolts can vary in length depending on the environmental conditions in which they are used. Typical examples are 1.8m, 2.4m and 3m in length. Further, the stopper 16 contains a 10 threaded aperture arranged to receive and engage the threaded portion 12 of the shaft 10. In the present invention a preferred embodiment of a mechanical feed means comprises a plurality of laterally disposed adjacent rollers 14 (in this case, two rollers) arranged to receive the shaft 10. Each roller 14 is generally cylindrical in shape with an annular, and 15 transversely arcuate circumferential groove 20 extending around an outer circumference thereof as illustrated in figure 2. The rollers 14 are so arranged that a longitudinal axis of the shaft 10 forms a centre point of a recess formed by opposed adjacent grooves 20. Further, the grooves 20 contain a plurality of transverse ribs 22 which, in use, aid in gripping a debonding sheath 18 between the rollers 14. The dimensions of the adjacent 20 grooves 20 are complementary to an outer profile of the debonding sheath 18. The debonding sheath 18 may be manufactured from, but is not limited to, a plastics material such as polyethylene piping. In use, opposed rollers 14 are powered to rotate at equal known speeds in opposite 3 WO 2010/009506 PCT/AU2009/000938 directions. The debonding sheath 18 is fed between the rollers 14 and received into the grooves 20. The debonding sheath is then gripped by ribs 22 and thereby urged onto an end of the shaft 10 disposed between the rollers 14 as illustrated in figure 2. In an embodiment of the present invention the rate of rotation of the rollers 14 is proportional 5 to the length of the debonding sheath 18 passing between the rollers 14 and may be used to measure and thereby control the length of debonding sheath 18 used in any application. A bulk supply of sheathing material may be positioned near the rollers 14, or further removed, in a spool arrangement to provide a constant supply for mass production. 10 Once the debonding sheath 18 encases the shaft 10 to a desired length it is immobilised by braking the rollers 14. A means to cut is then initialised to sever the debonding sheath 18 as shown in figure 3. In the illustrated embodiment of the present invention the means to cut is in the form of a guillotine blade 24 arrangement which is arranged to be activated by any suitable means. Other embodiments may use a different means to cut 15 such as a rotating blade, a toothed edge or a heat source. Further, other embodiments may include a variety of programmable motion sensors to bring the means to sheath and the means to cut into mechanical or electronic communication whereby an appropriate length of debonding sheath 18 is automatically 20 severed by the blade 24. Lastly, as shown in figures 4 and 5, a fixing means is applied to the sheath 18. A preferred embodiment of the present method uses a crimping sleeve 26 as the fixing means. The sheath 18 and the crimping sleeve 26 are correctly positioned on the shaft 10 4 WO 2010/009506 PCT/AU2009/000938 before a lateral force is applied to the crimping sleeve 26. Flanged side sections 28 upon the crimping sleeve 26 are thereby formed and result in a constant compressive force firmly fixing the sheath 18 to the encased shaft 10. 5 Modifications and variations as would be apparent to a skilled addressee are deemed to be within the scope of the present invention. 5
Claims (14)
1. A method of encasing a shaft, to be used in a yielding rock bolt, with a debonding sheath, characterized by mounting the shaft securely, passing the debonding sheath through mechanical feed means and feeding the debonding sheath onto the shaft.
2. A method according to claim 1, characterized in that the shaft is solid and has two ends, one of the ends being provided with an externally threaded portion.
3. A method according to claim 2, characterized in that the shaft is engaged with a stopper containing a threaded aperture which receives and engages the threaded portion of the shaft
4. A method according to claim 3, wherein the stopper is adjusted in position longitudinally and fixed at a position appropriate for a length of the yielding rock bolt produced.
5. A method according to any one of the preceding claims, characterized in that the mechanical feed means comprises a plurality of laterally disposed adjacent rollers which receive the debonding sheath.
6. A method according to claim 5, characterized in that each roller is generally cylindrical in shape with an annular and transversely arcuate groove extending 6 WO 2010/009506 PCT/AU2009/000938 around an outer circumference thereof, the debonding sheath being engaged by the grooves.
7. A method according to claim 6, characterized in that a longitudinal axis of the shaft forms a centre point of a recess formed by a pair of opposed adjacent grooves.
8. A method according to claim 6 or 7, characterized in that the grooves contain a plurality of transverse ribs which aid in gripping the debonding sheath.
9. A method according to any one of claims 5 to 8, wherein adjacent rollers are powered to rotate at equal speeds in opposite directions.
10. A method according to claim 9, characterized in that the rollers are immobilized by being braked once the shaft has been encased.
11. A method according to claim 9 or 10, characterized in that the debonding sheath is severed by cutting means after the shaft has been sheathed.
12. A method according to any one of claims 9 to 11, characterized in that fixing means is affixed to the sheath after the shaft has been encased so as to fix the sheath to the shaft.
13. A method according to claim 12, characterized in that the fixing means is a 7 WO 2010/009506 PCT/AU2009/000938 crimping sleeve which applies constant compressive force to the encased shaft.
14. A yielding rock bolt having a shaft encased by the method of any one of the preceding claims 8
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2009273761A AU2009273761B2 (en) | 2008-07-25 | 2009-07-24 | A method of encasing a yielding rock bolt shaft |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2008903809 | 2008-07-25 | ||
| AU2008903809A AU2008903809A0 (en) | 2008-07-25 | A method of encasing a yielding rock bolt shaft | |
| PCT/AU2009/000938 WO2010009506A1 (en) | 2008-07-25 | 2009-07-24 | A method of encasing a yielding rock bolt shaft |
| AU2009273761A AU2009273761B2 (en) | 2008-07-25 | 2009-07-24 | A method of encasing a yielding rock bolt shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2009273761A1 true AU2009273761A1 (en) | 2010-01-28 |
| AU2009273761B2 AU2009273761B2 (en) | 2014-07-31 |
Family
ID=41569929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2009273761A Ceased AU2009273761B2 (en) | 2008-07-25 | 2009-07-24 | A method of encasing a yielding rock bolt shaft |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR20110036827A (en) |
| AU (1) | AU2009273761B2 (en) |
| CL (1) | CL2011000130A1 (en) |
| PE (1) | PE20110526A1 (en) |
| WO (1) | WO2010009506A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9677399B2 (en) | 2013-07-12 | 2017-06-13 | Minova International Limited | Yieldable rock anchor |
| SE543815C2 (en) * | 2018-03-05 | 2021-08-03 | Nybergs Mekaniska Verkst Ab | Adaptive and instantaneous coating of protective barriers on a rock reinforcement element |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3942238A (en) * | 1974-04-22 | 1976-03-09 | Jean Pierre Dore | Method for reinforcing structures |
| DE4442483A1 (en) * | 1994-11-29 | 1996-05-30 | Suspa Spannbeton Gmbh | Introduction of steel reinforcement rods into common concrete pipe |
| AU2002953368A0 (en) * | 2002-12-16 | 2003-01-09 | Garford Pty Ltd | A yielding rock bolt |
| CA2480729C (en) * | 2004-06-30 | 2013-07-02 | Ground Control (Sudbury) Limited | Yieldable rock fastener system and method |
| MX2008012937A (en) * | 2006-04-06 | 2009-04-22 | Garford Pty Ltd | A yielding rock bolt. |
| DE102006053141B3 (en) * | 2006-11-10 | 2008-06-19 | Atlas Copco Mai Gmbh | Improved slip anchor |
-
2009
- 2009-07-24 AU AU2009273761A patent/AU2009273761B2/en not_active Ceased
- 2009-07-24 KR KR1020117002914A patent/KR20110036827A/en not_active Application Discontinuation
- 2009-07-24 PE PE2011000078A patent/PE20110526A1/en not_active Application Discontinuation
- 2009-07-24 WO PCT/AU2009/000938 patent/WO2010009506A1/en active Application Filing
-
2011
- 2011-01-21 CL CL2011000130A patent/CL2011000130A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CL2011000130A1 (en) | 2011-11-11 |
| AU2009273761B2 (en) | 2014-07-31 |
| KR20110036827A (en) | 2011-04-11 |
| WO2010009506A1 (en) | 2010-01-28 |
| PE20110526A1 (en) | 2011-07-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |