WO2009079684A1 - Self drilling rock bolting - Google Patents
Self drilling rock bolting Download PDFInfo
- Publication number
- WO2009079684A1 WO2009079684A1 PCT/AU2008/001838 AU2008001838W WO2009079684A1 WO 2009079684 A1 WO2009079684 A1 WO 2009079684A1 AU 2008001838 W AU2008001838 W AU 2008001838W WO 2009079684 A1 WO2009079684 A1 WO 2009079684A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rock bolt
- fluid
- drilling
- bolt
- rock
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- the present invention relates to self drilling rock bolting.
- the invention concerns both a drilling apparatus for rock bolting, and a rock bolt for use with the drilling apparatus.
- the invention concerns a system comprising the drilling apparatus in combination with a rock bolt and a method for rock bolting using the system.
- the invention has application, but not exclusively, to rock bolting to stabilise the roof and walls of underground coal mines.
- Self drilling rock bolts are known for providing a single drilling and securing function. This negates the need to drill a hole, withdraw the drill bit and subsequently insert a bolt into the hole.
- An existing method of securing a rock bolt to a coal strata is to drill a hole in the coal strata using a drill mast with a drill bit attached thereto. After the hole has been bored and the drill bit retracted, the drill bit is removed from the drill chuck. A rock bolt is then inserted into a drive dolly which forms an adapter between the bolt and a chuck. A resin capsule is then inserted into the bored hole. The bolt is then loaded into the bore hole, and the bolt causes the resin capsule to rupture. The bolt is then rotated to promote mixing and dispersion of the resin. Once the resin has set, a nut on the end of the bolt is rotated and the nut comes into abutment with the collar of the hole. The interaction between the collar of the borehole and the nut places a tensile loading on the stem of the bolt. Accordingly, the strata adjacent to the bolt is compressively loaded, thereby locally stabilising the strata.
- a disadvantage with the above described bolting method is that it is a multi stage, and is thus time consuming operation.
- the complicated nature of this bolting installation technique also requires significant manual handling, which results in slow bolt installation cycle times.
- One known self drilling rock bolting system uses a hollow bar. A passage through the centre of the bar serves as a flow path for water to flush rock cuttings out of the bore hole. The passage is also used for the ingression of a cementious grout for subsequently securing the bolt to the adjacent wall of the borehole. The cementious grout is generally supplied in a secondary process. Accordingly, this system also suffers from being time consuming.
- a known single stage self drilling rock bolt system is manufactured by Hilti Corporation. This system utilises a hollow bar with a chemical resin capsule housed in the centre of the bar. Water for flushing drill cuttings is also permitted to travel through the inside of the bar in a separate annulus leading to the drill tip. In this system, after the hole boring has been completed, water is injected into the cavity containing the resin capsule. The water ruptures the resin capsule, forcing resin through a hole in the tip of the bar to the bore hole. The resin then sets, bonding the bolt to the rock strata.
- the equipment used in the Hilti system is based upon conventional drilling equipment, with the addition of the water injection function to disperse the resin.
- a disadvantage with this system is that the resin capsule may prematurely rupture during transportation, or during the boring process, prior to completion of the boring process.
- a further disadvantage is that the bolts have a limited shelf life on account of the expiration of the resin capsule.
- the invention is a drilling apparatus for rock bolting with a self-drilling rock bolt, comprising within it a fluid injector having an upper part that mates with a self- drilling rock bolt inserted into the drilling apparatus for boring a hole.
- the injector includes three fluid inlets, three fluid outlets in the upper part, and three fluid conduits extending from respective inlets to respective outlets.
- the system may further comprise a hydraulically driven pump to pump water to a first fluid inlet. It may also comprise pumps to pump resin and catalyst to second and third fluid inlets.
- the pumps may operate to provide different resin and catalyst flow rates. In addition they may provide precise differential control, to allow different resin catalyst mix ratios for different bolting conditions.
- the upper part of the injector is insertable within a fixed collar of the rock bolt to make a fluid tight mating between them.
- the invention is a self drilling rock bolt, comprising an elongate body having a leading end with a cutting tip, and around the tip a thread with a coarse pitch.
- the bolt also has a trailing end with an integral collar to form a fluid connection to a channel that extends axially through the body of the rock bolt to the leading end, and above the collar a thread with a fine pitch.
- a nut is threaded onto the fine pitch and engaged with a drill which operates to drive the nut along the fine pitch thread to abut against the collar during boring. After boring, reversal of the drill drives the nut away from the collar.
- the channel within the rock bolt may open in the cutting tip of the bolt.
- the channel within the rock bolt may incorporate a fluid mixer within it.
- the fluid mixer may comprise a flow restriction.
- the invention is a rock bolting system comprising a combination of the drilling apparatus and a rock bolt.
- the invention is a method of using the system for rock bolting, comprising the steps of:
- a further step in the process then involves operation of the drilling apparatus, in the opposite direction to the direction used to bore the hole, to push the nut into abutment with the opening of the bore hole and to compressively load a local region of strata.
- the drilling apparatus is then separated from the rock bolt and removed from the site of the boring and securing operation.
- the drilling apparatus may then be reloaded with a further bolt and the process is repeated as required.
- Fig.l is a schematic diagram of a rock bolt installation system in a detached configuration and showing some of the interior detail.
- Fig.2 is a schematic diagram of a rock bolt installation system in a use configuration and showing some of the interior detail. Best Mode of the Invention
- Fig. 1 depicts a rock bolt installation system 10 for securing a rock bolt 20 to a strata, such as a coal strata.
- the system 10 includes hydraulically operated drilling apparatus 30.
- the drilling apparatus 30 is selectively operable in both clockwise and anticlockwise rotational directions.
- the rock bolt 20 has a leading end 21 with a cutting tip 22 and a trailing end 23.
- the leading end 21 is threaded and has a coarse pitch.
- Part of the trailing end 23 is also threaded but has a fine pitch 24.
- the trailing end 23 of the rock bolt 20 also includes a fixed collar 27.
- a nut 25 is threadingly engageable with the fine pitch 24 of the rock bolt above the collar 27.
- the nut 25 which has a polygonal profile that mates with the chuck 31 of drill 30.
- the rock bolt 20 has an internal central fluid flow channel 40 formed therein which extends between openings in the leading end 21 and within collar 27 at the trailing end 23.
- a static mixer is located within the flow channel.
- the mixer is in the form of a flow restriction 41.
- the drilling apparatus 30 includes within it an injector 50.
- the injector 50 has water inlet 51 to receive water from a water pumping system 61 or water source.
- Injector 50 also has a resin inlet 52 to receive resin from a resin pumping system 62.
- a catalyst inlet 53 to receive catalyst from a catalyst pumping system 63.
- the resin pumping system 62 and catalyst pumping system 63 use pumps which are resistant to the aggressive chemical nature of the resin. These pumping systems 62 and 63 permit different resin and catalyst flow rates to be provided, with precise differential control, to allow different resin catalyst mixes for different bolting conditions.
- the upper end 57 of the injector 50 is insertable within the fixed collar 27 of the rock bolt 20. The connection between the projection 57 and the collar 27, when the projection is inserted into the skirt, is fluid tight.
- a water flow conduit 71 carries water between inlet 51 and the upper end 57 of injector 50.
- flow conduits 72 and 73 extend from the resin 52 and catalyst 53 inlets to carry resin and catalyst to the upper end of injector 50. Since the resin is unable to harden until it comes into contact with the catalyst, by providing separate fluid flow conduits for the resin and the catalyst, the risk of the injector head becoming blocked with hard resin is significantly reduced.
- the cutting tip 22 of the rock bolt 20 is then placed against the coal strata 80 and the drill motor 30 is rotated in an anticlockwise direction.
- the nut 25 abuts against the collar 27 preventing the rock bolt 20 from longitudinal movement relative to the chuck.
- the cutting tip 22 of the rock bolt 20 starts to bore a hole within the strata.
- the water pumping system 61 or source delivers water into the conduit 71 of the injector 50.
- the water passes axially through the injector 50 and out of its upper end 51 before entering into the trailing end 23 of the rock bolt 20.
- the water passes through channel 40 in the rock bolt 20 and exits from the tip 22 where it assists in dispersing drill cuttings away from the cutting tip 22 of the rock bolt 20, and out of the bore hole.
- the coarse thread 21 adjacent to the tip 22 of the rock bolt 20 assists with clearing of the rock cuttings, and this improves load transfer between the bolt and the strata after bonding.
- the homogenous mixture of resin and catalyst then exits from tip 22 and fills the space between the rock bolt 20 and the adjacent strata 80.
- the resin quickly sets and hardens, bonding the rock bolt 20 to the strata 80.
- the nut 25 is then rotated clockwise so that it moves axially along the fine thread 24 of the trailing end 23 of the rock bolt 20. This movement separates the nut 25 from collar 27 and pushes nut 25 firmly into abutment against the opening of the bore hole.
- the chuck 31 is then released from the rock bolt 20 and drill 30 is removed from the site of the boring and securing operation.
- the drill 30 and chuck 31 are then reloaded with a further bolt 20 and the process is repeated as required.
- rock bolt may be secured to the drill in many different ways, such as by using a threaded connection, a frictional interference such as an expanding collet chuck, or another suitable engagement.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/809,998 US20110070035A1 (en) | 2007-12-21 | 2008-12-15 | Self drilling rock bolting |
AU2008341002A AU2008341002A1 (en) | 2007-12-21 | 2008-12-15 | Self drilling rock bolting |
EP08864186A EP2232014A1 (en) | 2007-12-21 | 2008-12-15 | Self drilling rock bolting |
ZA2010/04764A ZA201004764B (en) | 2007-12-21 | 2010-07-06 | Self drilling rock bolting |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2007907063A AU2007907063A0 (en) | 2007-12-21 | Self drilling rock bolting system and method | |
AU2007907063 | 2007-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009079684A1 true WO2009079684A1 (en) | 2009-07-02 |
Family
ID=40800557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2008/001838 WO2009079684A1 (en) | 2007-12-21 | 2008-12-15 | Self drilling rock bolting |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110070035A1 (en) |
EP (1) | EP2232014A1 (en) |
AU (1) | AU2008341002A1 (en) |
WO (1) | WO2009079684A1 (en) |
ZA (1) | ZA201004764B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120048009A1 (en) * | 2009-05-06 | 2012-03-01 | Malmfalten Ab | Method, system, use of the system and reinforcement member for rock reinforcement |
WO2012171056A1 (en) * | 2011-06-14 | 2012-12-20 | Shane Brown | Resin injection apparatus for drilling apparatus for installing a ground anchor |
WO2013170312A1 (en) * | 2012-05-17 | 2013-11-21 | Peter Andrew Gray | Injection and drive arrangement for rock bolting |
US9664042B2 (en) | 2011-11-28 | 2017-05-30 | Hilti Aktiengesellschaft | Anchor, especially a rock anchor |
WO2019083430A1 (en) * | 2017-10-27 | 2019-05-02 | Epiroc Rock Drills Aktiebolag | Method and system for ensuring the quality of a multi-component mixture for rock reinforcment |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8967916B2 (en) * | 2011-05-05 | 2015-03-03 | Earth Support Services, Inc. | Mine roof support apparatus and system |
CL2011002065A1 (en) * | 2011-08-23 | 2011-10-28 | Fortification system that simultaneously performs the drilling and installation of friction fortification bolts for the maintenance of land, in the process of drilling and installing the friction bolt, the cylinder head or adapter and the drilling bar are recovered, losing only the drill bit in charge of breaking the rocky mace. | |
AU2013243217A1 (en) * | 2012-04-04 | 2014-08-14 | Rambor Pty Limited | A roof bolter |
EP3004547B1 (en) * | 2013-05-27 | 2018-03-21 | Oka Rock Bolt Technologies Pty Limited | A self-drilling rock bolt assembly and method of installation |
JP6521579B2 (en) * | 2014-06-27 | 2019-05-29 | 株式会社河戸製作所 | 2-pack mixed coagulant injection joint |
SE538499C2 (en) * | 2014-11-13 | 2016-08-09 | Rock Safety Sweden Ab | Device for rock bolt and method for using the device as well as reinforcing systems including such device. |
RU2681171C1 (en) | 2015-03-03 | 2019-03-04 | Джей-ЛОК КО. | Pumpable two-component resin |
SE540076C2 (en) * | 2016-04-12 | 2018-03-13 | Atlas Copco Rock Drills Ab | Method and apparatus for rock reinforcement |
CN109642462B (en) | 2016-09-02 | 2021-07-09 | J-洛克公司 | Pumpable resin system |
US11156217B2 (en) | 2017-11-10 | 2021-10-26 | J-Lok Co. | Hydraulic and control system for resin injection |
CN107893670A (en) * | 2017-12-11 | 2018-04-10 | 贵州大学 | A kind of anti-wall caving retaining wall supporting construction in comprehensive pick face |
US10669849B2 (en) * | 2018-01-05 | 2020-06-02 | Nevada Industrial LLC | Rock anchor inflation and draining system |
EP3628815A1 (en) * | 2018-09-26 | 2020-04-01 | Sandvik Mining and Construction Oy | Rock drilling machine, rig and method for reinforcing rock surfaces |
EP3924603A4 (en) * | 2019-02-13 | 2022-11-02 | FCI Holdings Delaware, Inc. | Resin injection dolly |
EP3696365B1 (en) * | 2019-02-14 | 2021-12-22 | Sandvik Mining and Construction Oy | Rock drilling arrangement, rock drilling rig and drilling method |
CN111764864B (en) * | 2020-07-10 | 2021-07-27 | 中国矿业大学 | Drilling and guniting reinforcement method for loose and broken coal and rock area |
CN113090308B (en) * | 2021-04-30 | 2024-02-06 | 中煤科工开采研究院有限公司 | Anchor bolt support construction device |
CN113217051A (en) * | 2021-04-30 | 2021-08-06 | 中煤科工开采研究院有限公司 | Multifunctional anchor rod support construction device |
CN113294183A (en) * | 2021-04-30 | 2021-08-24 | 中煤科工开采研究院有限公司 | Anchor rod construction assembly |
CN113090306B (en) * | 2021-04-30 | 2023-05-12 | 中煤科工开采研究院有限公司 | Multifunctional anchor bolt support construction equipment |
CN113090307B (en) * | 2021-04-30 | 2023-08-25 | 中煤科工开采研究院有限公司 | Anchor bolt support construction equipment |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6335913A (en) * | 1986-07-31 | 1988-02-16 | Tokai Rubber Ind Ltd | Rockbed solidifying work |
DE4024869A1 (en) * | 1989-08-10 | 1991-02-14 | Magyar Aluminium | Hydraulic self-drilling rock anchor - consists of tube deformed along its length by involuted slot with central axial borehole for fluid |
RU2157454C2 (en) * | 1998-02-04 | 2000-10-10 | Черных Николай Георгиевич | Process of erection of roof bolting |
WO2007059580A1 (en) * | 2005-11-24 | 2007-05-31 | Peter Andrew Gray | Self drilling rock bolt |
-
2008
- 2008-12-15 US US12/809,998 patent/US20110070035A1/en not_active Abandoned
- 2008-12-15 AU AU2008341002A patent/AU2008341002A1/en not_active Abandoned
- 2008-12-15 WO PCT/AU2008/001838 patent/WO2009079684A1/en active Application Filing
- 2008-12-15 EP EP08864186A patent/EP2232014A1/en not_active Withdrawn
-
2010
- 2010-07-06 ZA ZA2010/04764A patent/ZA201004764B/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6335913A (en) * | 1986-07-31 | 1988-02-16 | Tokai Rubber Ind Ltd | Rockbed solidifying work |
DE4024869A1 (en) * | 1989-08-10 | 1991-02-14 | Magyar Aluminium | Hydraulic self-drilling rock anchor - consists of tube deformed along its length by involuted slot with central axial borehole for fluid |
RU2157454C2 (en) * | 1998-02-04 | 2000-10-10 | Черных Николай Георгиевич | Process of erection of roof bolting |
WO2007059580A1 (en) * | 2005-11-24 | 2007-05-31 | Peter Andrew Gray | Self drilling rock bolt |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120048009A1 (en) * | 2009-05-06 | 2012-03-01 | Malmfalten Ab | Method, system, use of the system and reinforcement member for rock reinforcement |
US8814476B2 (en) * | 2009-05-06 | 2014-08-26 | Malmafälten AB | Method, system, use of the system and reinforcement member for rock reinforcement |
WO2012171056A1 (en) * | 2011-06-14 | 2012-12-20 | Shane Brown | Resin injection apparatus for drilling apparatus for installing a ground anchor |
CN103874829A (en) * | 2011-06-14 | 2014-06-18 | 谢恩.布朗 | Resin injection apparatus for drilling apparatus for installing a ground anchor |
US9175561B2 (en) | 2011-06-14 | 2015-11-03 | Shane Brown | Resin injection apparatus for drilling apparatus for installing a ground anchor |
EP2721255A4 (en) * | 2011-06-14 | 2016-01-06 | Shane Brown | Resin injection apparatus for drilling apparatus for installing a ground anchor |
AU2012269719B2 (en) * | 2011-06-14 | 2016-03-17 | Geobrugg Ag | Resin injection apparatus for drilling apparatus for installing a ground anchor |
US9664042B2 (en) | 2011-11-28 | 2017-05-30 | Hilti Aktiengesellschaft | Anchor, especially a rock anchor |
EP2785975B1 (en) * | 2011-11-28 | 2017-07-12 | HILTI Aktiengesellschaft | Anchor, especially a rock anchor |
WO2013170312A1 (en) * | 2012-05-17 | 2013-11-21 | Peter Andrew Gray | Injection and drive arrangement for rock bolting |
WO2019083430A1 (en) * | 2017-10-27 | 2019-05-02 | Epiroc Rock Drills Aktiebolag | Method and system for ensuring the quality of a multi-component mixture for rock reinforcment |
US11454115B2 (en) | 2017-10-27 | 2022-09-27 | Epiroc Rock Drills Aktiebolag | Method and system for ensuring the quality of a multi-component mixture for rock reinforcement |
Also Published As
Publication number | Publication date |
---|---|
EP2232014A1 (en) | 2010-09-29 |
US20110070035A1 (en) | 2011-03-24 |
ZA201004764B (en) | 2011-11-30 |
AU2008341002A1 (en) | 2009-07-02 |
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