EP2232014A1 - Soutènement par boulons d'ancrage autoforeurs - Google Patents

Soutènement par boulons d'ancrage autoforeurs

Info

Publication number
EP2232014A1
EP2232014A1 EP08864186A EP08864186A EP2232014A1 EP 2232014 A1 EP2232014 A1 EP 2232014A1 EP 08864186 A EP08864186 A EP 08864186A EP 08864186 A EP08864186 A EP 08864186A EP 2232014 A1 EP2232014 A1 EP 2232014A1
Authority
EP
European Patent Office
Prior art keywords
rock bolt
fluid
drilling
bolt
rock
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.)
Withdrawn
Application number
EP08864186A
Other languages
German (de)
English (en)
Inventor
Di Pietro Ricardo
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.)
Alminco Pty Ltd
Original Assignee
Alminco Pty Ltd
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
Priority claimed from AU2007907063A external-priority patent/AU2007907063A0/en
Application filed by Alminco Pty Ltd filed Critical Alminco Pty Ltd
Publication of EP2232014A1 publication Critical patent/EP2232014A1/fr
Withdrawn legal-status Critical Current

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.

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)
  • Earth Drilling (AREA)
  • Catalysts (AREA)

Abstract

La présente invention concerne un soutènement par boulons d'ancrage autoforeurs. L'invention concerne en particulier un appareil de forage pour soutènement par boulons d'ancrage, et un boulon d'ancrage destiné à être utilisé avec l'appareil de forage. L'appareil de forage est composé d'un injecteur de fluide comportant une partie supérieure qui s'accouple avec un boulon d'ancrage autoforeur pour percer un trou. L'injecteur comprend trois entrées de fluide, trois sorties de fluide dans la partie supérieure, et trois conduites de fluide s'étendant des entrées respectives vers les sorties respectives. Le boulon d'ancrage autoforeur présente un corps allongé doté d'une extrémité arrière ayant une pointe coupante, et, autour de la pointe, un filet avec un gros pas. Le boulon comprend également une extrémité arrière avec un collier solidaire pour assurer une connexion fluidique avec un canal qui s'étend axialement à travers le corps du boulon d'ancrage vers l'extrémité arrière. La partie supérieure du collier comporte un filetage avec un petit pas. Dans d'autres aspects, l'invention concerne un système comprenant l'appareil de forage combiné avec un boulon d'ancrage et un procédé pour soutènement par boulons d'ancrage utilisant le système. L'invention trouve son application, de manière non exclusive, dans le soutènement par boulons d'ancrage visant à stabiliser le toit et les parois des mines de charbon souterraines.
EP08864186A 2007-12-21 2008-12-15 Soutènement par boulons d'ancrage autoforeurs Withdrawn EP2232014A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007907063A AU2007907063A0 (en) 2007-12-21 Self drilling rock bolting system and method
PCT/AU2008/001838 WO2009079684A1 (fr) 2007-12-21 2008-12-15 Soutènement par boulons d'ancrage autoforeurs

Publications (1)

Publication Number Publication Date
EP2232014A1 true EP2232014A1 (fr) 2010-09-29

Family

ID=40800557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08864186A Withdrawn EP2232014A1 (fr) 2007-12-21 2008-12-15 Soutènement par boulons d'ancrage autoforeurs

Country Status (5)

Country Link
US (1) US20110070035A1 (fr)
EP (1) EP2232014A1 (fr)
AU (1) AU2008341002A1 (fr)
WO (1) WO2009079684A1 (fr)
ZA (1) ZA201004764B (fr)

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SE533769C2 (sv) * 2009-05-06 2010-12-28 Malmfaelten Ab Förfarande, system, användning av system jämte förstärkningsorgan vid bergförstärkning
US8967916B2 (en) * 2011-05-05 2015-03-03 Earth Support Services, Inc. Mine roof support apparatus and system
CA2839164A1 (fr) * 2011-06-14 2012-12-20 Shane Brown Appareil d'injection de resine destine a un appareil de forage permettant d'installer un tirant d'ancrage
CL2011002065A1 (es) * 2011-08-23 2011-10-28 Sistema de fortificacion que realiza simultaneamente la perforacion e instalar pernos de fortificacion por friccion para el sostenimiento de terrenos, en el proceso de perforacion e instalacion del perno de friccion, se recupera el culatin o adaptador y la barra de perforacion, perdiendose solo la broca encargada de romper el maciso rocoso.
DE102011087178A1 (de) * 2011-11-28 2013-05-29 Hilti Aktiengesellschaft Anker, insbesondere Gesteinsanker
WO2013149283A1 (fr) * 2012-04-04 2013-10-10 Rambor Pty Limited Dispositif de pose de boulons dans le toit
WO2013170312A1 (fr) * 2012-05-17 2013-11-21 Peter Andrew Gray Système d'injection et d'entraînement pour soutènement par boulons d'ancrage
RS57349B1 (sr) 2013-05-27 2018-08-31 Oka Rock Bolt Tech Pty Limited Samo-bušeći sklop zavrtnja za ankerisanje stenskih slojeva i način postavljanja
JP6521579B2 (ja) * 2014-06-27 2019-05-29 株式会社河戸製作所 ２液混合型凝固剤注入継手
SE538499C2 (sv) * 2014-11-13 2016-08-09 Rock Safety Sweden Ab Anordning för bergbult och förfarande för användning av anordningen samt förstärkningssystem innefattande sådan anordning.
RU2681171C1 (ru) 2015-03-03 2019-03-04 Джей-ЛОК КО. Поддающаяся перекачке насосом двухкомпонентная смола
SE540076C2 (sv) * 2016-04-12 2018-03-13 Atlas Copco Rock Drills Ab Förfarande och anordning vid bergförstärkning
CA3035421C (fr) * 2016-09-02 2021-05-18 J-Lok Co. Systeme a resine pompable
SE541304C2 (sv) 2017-10-27 2019-06-25 Epiroc Rock Drills Ab Förfarande och system för att säkerställa kvaliteten på en flerkomponentsblandning för bergförstärkning
US11156217B2 (en) 2017-11-10 2021-10-26 J-Lok Co. Hydraulic and control system for resin injection
CN107893670A (zh) * 2017-12-11 2018-04-10 贵州大学 一种综掘面防片帮护壁支护结构
US10669849B2 (en) * 2018-01-05 2020-06-02 Nevada Industrial LLC Rock anchor inflation and draining system
EP3628815A1 (fr) * 2018-09-26 2020-04-01 Sandvik Mining and Construction Oy Machine de forage de roches, installation et procédé de renforcement de surfaces rocheuses
CN113474535A (zh) * 2019-02-13 2021-10-01 Fci特拉华控股有限公司 树脂注入抵座
EP3696365B1 (fr) * 2019-02-14 2021-12-22 Sandvik Mining and Construction Oy Agencement de forage de roches, installation de forage de roches et procédé de forage
CN111764864B (zh) * 2020-07-10 2021-07-27 中国矿业大学 一种用于松散破碎煤岩区的钻孔喷浆加固方法
CN113294183A (zh) * 2021-04-30 2021-08-24 中煤科工开采研究院有限公司 锚杆施工组件
CN113090306B (zh) * 2021-04-30 2023-05-12 中煤科工开采研究院有限公司 多功能锚杆支护施工设备
CN113090308B (zh) * 2021-04-30 2024-02-06 中煤科工开采研究院有限公司 锚杆支护施工装置
CN113090307B (zh) * 2021-04-30 2023-08-25 中煤科工开采研究院有限公司 锚杆支护施工设备
CN113217051A (zh) * 2021-04-30 2021-08-06 中煤科工开采研究院有限公司 多功能锚杆支护施工装置

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Also Published As

Publication number Publication date
AU2008341002A1 (en) 2009-07-02
WO2009079684A1 (fr) 2009-07-02
US20110070035A1 (en) 2011-03-24
ZA201004764B (en) 2011-11-30

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