WO1999045337A1 - Cartouche explosive oblongue enroulable - Google Patents

Cartouche explosive oblongue enroulable Download PDF

Info

Publication number
WO1999045337A1
WO1999045337A1 PCT/AU1999/000134 AU9900134W WO9945337A1 WO 1999045337 A1 WO1999045337 A1 WO 1999045337A1 AU 9900134 W AU9900134 W AU 9900134W WO 9945337 A1 WO9945337 A1 WO 9945337A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
explosive
charge
semi rigid
explosive charge
Prior art date
Application number
PCT/AU1999/000134
Other languages
English (en)
Inventor
Richard John Johnson
Original Assignee
Johnson, Christopher, Richard
Johnson, Stephen, Alexander
Johnson, Cheryl, Noeleen
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 AUPP2149A external-priority patent/AUPP214998A0/en
Priority claimed from AUPP6299A external-priority patent/AUPP629998A0/en
Application filed by Johnson, Christopher, Richard, Johnson, Stephen, Alexander, Johnson, Cheryl, Noeleen filed Critical Johnson, Christopher, Richard
Priority to AU28202/99A priority Critical patent/AU2820299A/en
Publication of WO1999045337A1 publication Critical patent/WO1999045337A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/087—Flexible or deformable blasting cartridges, e.g. bags or hoses for slurries
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/28—Cartridge cases characterised by the material used, e.g. coatings

Definitions

  • British Patent 1281421 also describes the packaging of an ammonium nitrate explosive in a thin flexible plastics sheath such as polyethylene.
  • This product has a detonating cord extending throughout an elongate explosive filled sheath in a unitary charge up to 20m long.
  • the specification discloses divisible charges in rolls of from 50m to 100m in length whereby charges of selected shorter length can be formed by clamping the sheath at closely spaced intervals and severing the charge therebetween.
  • the patent specification states that explosive charges according to the invention can be inserted into boreholes at up to 60° from vertical and 2 moreover that with the aid of a bracket shaped slide, these packages can be inserted into horizontal boreholes.
  • a particular difficulty with such flexible, thin walled elongate explosive charges is that when rolled into conveniently sized coils for packaging, transportation and storage, the tubular sheath is prone to kinking or flattening in parts.
  • the cross-sectional area of the explosive charge is substantially diminished and with severe kinking, a discontinuity may be formed in the mass of explosive material. This kinking or cross sectional area reduction can also occur when trying to insert elongate thin walled flexible tubular explosive charges into inclined or horizontal boreholes.
  • a difficulty encountered with these prior art modular explosives tubes is that a close face to face abutment of the explosive composition in adjacent tubes is required to ensure propagation of the explosive force throughout the entire assembly which may for example comprise six tubes joined by the socket and spigot fittings.
  • these tubes are initially filled with a heated mix to reduce the viscosity of the normally non-flowable viscous emulsion, the tube contents undergo shrinkage on cooling and can create a gap of 2- 3mm between the faces of explosive material when the tubes are joined.
  • a water gel or emulsion explosive is loaded into the borehole, typically in the form of spigot and socket joined tubes described above. Again this procedure is prone to unreliability due to gapping between the primer and the end of the explosive charge and/or between adjacent tubes which can lead to ineffectual blasting, rifling of the borehole and unexploded explosives left in the borehole.
  • an explosive charge comprising:- an elongate semi rigid plastics tube having a closure at each end, a detonating cord extending longitudinally within the tube between opposite ends thereof, and an explosive composition occupying the interior of said tube.
  • the semi rigid tube is selected from a stiffness range to permit easy insertion of the charge into horizontal or upwardly inclined boreholes.
  • said semi rigid tube in use, permits formation of said charge into a coil having an inner diameter of 200mm or greater without kinking.
  • said semi rigid plastics tube has a wall thickness in the 5 range of from 300 to 1500 .
  • the semi rigid tube has a wall thickness of 800 ⁇ to
  • the semi rigid tube may be formed with smooth exterior and interior walls.
  • the semi rigid tube may be formed with a corrugated wall to facilitate coiling of a charge.
  • the semi rigid tube has an external diameter in the range 10mm to 50mm.
  • the semi rigid tube has an external diameter of from
  • the charge may comprise an enlarged end portion having a diameter 20% to 100% greater than the diameter of the tube.
  • the enlarged end portion preferably comprises a diameter 50% greater than the diameter of the tube.
  • the enlarged end portion may have an axial length in the range 100mm to 1000mm.
  • the enlarged end portion has an axial length in the range 200mm to 500mm. If required the enlarged end portion may be integrally formed with the semi rigid tube.
  • the enlarged end portion may be removably attachable to said semi rigid tube.
  • the explosive composition may be selected from flowable particulate materials, water gels or emulsions.
  • the explosive composition may be cap sensitive.
  • the tube may be sealed at opposite ends by any suitable means.
  • a normally distal end of the charge is sealed with a bung having a sealed cap well.
  • a proximal end of the charge includes a free end of said tube to enable, in use, the free end to be folded over to form a 6
  • the packing density of the explosive composition is greater than 1.0 gm cm '3 .
  • a first method of manufacturing a coilable elongate explosive charge comprising the steps of:- inserting a detonator cord through a predetermined length of semi rigid plastics tube; securing a distal end of said detonator cord to a closure member and inserting said closure member into a distal end of said tube; suspending said tube from a proximal end from a filling station; progressively filling said tube with a flowable particulate explosive composition; and, sealing said proximal end of said tube with at least portion of said detonating cord extending therefrom.
  • said tube is suspended from a vibratory suspension means.
  • a free end of the tube extends beyond a proximal seal, to enable folding of the proximal free end, in use, to form a stem plug.
  • a second method of manufacturing a coilable elongate explosive charge comprising the steps of supporting on a hollow mandrel a predetermined length of semi rigid plastics tube having a closed distal end; pumping a fluid explosive composition into said tube via said hollow mandrel to progressively displace said tube along said tube with a predetermined quantity of explosive composition; and forming a closure in a proximal end of said tube.
  • said distal end may be closed with a closure means having a sealed cap well.
  • the semi rigid plastics tube may include a detonating cord 7
  • FIG 1 shows a coilable elongate explosive charge.
  • FIG 2 shows a closure member for use in the charge of FIG 1.
  • FIG 3 shows an alternative embodiment of the invention.
  • FIG 4 shows schematically one method of filling a coilable explosive charge.
  • FIG 5 shows schematically another method of filling a coilable explosive charge.
  • the explosive charge 1 comprises a 4.5m length of low or medium density polyethylene tube 2 having a wall thickness of 1.0mm.
  • the tube 2 is sealed at its distal end 3 with a rubber, plastics or timber bung 4 to which is attached one end of a length of detonator cord 5.
  • Detonator cord 5 extends throughout the axial length of tube 2 and a free end 6 extends through a closure 7 at the proximal end of the tube 2.
  • the closure 7 is conveniently a "Tipper Tie" in the form of a metal clip extending tightly around the tube 2 to form a waterproof seal.
  • a particulate explosive composition which may comprise for example 90% ammonium nitrate (finely ground), 6-8% of a particulate carbonaceous fuel such as a coal dust, and 2-4% of a sensitizer such as aluminium powder, perchlorate etc. It is to be understood that the present invention is not limited to any particular explosive composition and may comprise any known flowable 8 particulate explosive, water gels and emulsions.
  • distal means the remote end of the charge, in use, closest the butt of the borehole and "proximal” means the end of the charge opposite the distal end.
  • the detonator cord as described above may be selected from 5gm cord for general applications or up to 10 gm cord for harder earth formations. Typically, charges of the type described above will be used in perimeter hole blasting where horizontal boreholes are drilled for tunnel shaping etc.
  • the charges used for perimeter hole blasting typically are from 2 to 5 metres long but often in the range 3-4 metres.
  • the boreholes are usually spaced at 750-800mm from each other and may be 30-50mm in diameter.
  • a free end 8 of the tube extends beyond closure 7 for about 400mm in length. This enables the proximal free end, in use, to be folded over upon itself to form a stem plug when inserting the charge into a borehole thereby alleviating the costs associated with insertion of a separate stem plug as required with prior art charges of this type.
  • FIG 2 shows a preferred form of distal end closure in the form of a plastics bung 9 having a cylindrical body 10 and an end flange 11. Apertures 12 extend through the bung 9, the purpose of which will be described later.
  • bung 9 Also located in bung 9 is a blind bore or cap well 13 adapted to receive a detonator (not shown) but otherwise to provide a waterproof closure for use in water filled boreholes.
  • FIG 3 shows the bung of FIG 2 fitted to an alternative embodiment of the invention. 9
  • the distal end 14 of tube 15 is radially increased from say 20mm to about 35mm over an axial length of from 100mm to 600mm to provide a charge region of increased powder or energy factor at the base or butt of a borehole.
  • the increased radial volume may accommodate an explosive composition having a higher explosive energy than that in tube 15 but preferably contains the same composition throughout the axial length of the charge.
  • a detonator cord 16 is extended through the length of tube 15 and through one of apertures 12 and then the free end 17 of the detonator cord is inserted back through the other of apertures 12 to securely locate the cord 16 in the charge.
  • Bung 9 is then secured to the distal end 14 to tube 15 by heat sealing, adhesive or mechanical clamping means (not shown) before the explosive composition is inserted into the tube.
  • FIG 3 shows a method of manufacture of a coilable explosive charge having a flowable particulate explosive composition.
  • a 4m length of 20mm diameter polyethylene tubing 20 first has a detonator cord 21 (shown in phantom) inserted and secured in the distal end thereof by means of a bung 22 as generally shown in FIG 2.
  • Tube 20 is then suspended by its proximal end in a clamping gland 23 in filling station 24 with the neck 25 of a filling hopper 26 inserted into the open end of tube 20.
  • Valve 27 is opened and the filling station 24, mounted on resilient mounts 28 is vibrated by a mechanical or electromechanical vibrator 29 to assist in filling the tube with a flowable particulate explosive composition 30 from hopper 26.
  • Vibration is important during the filling operation to not only reduce filling time but also to ensure an even packing density of the particulate explosive composition over the entire length of tube 20.
  • a packing density greater than 1.0 gm cm "3 is desirable to ensure 10 that the charge will not float in a water filled borehole.
  • valve 27 When the tube 20 has been filled to a distance of about 400mm from the proximal end of the tube, valve 27 is closed and a "Tipper Tie"
  • Gland 23 is released and the tubular charge drops onto an arcuate guideway (not shown) leading on to a horizontal inspection and packing table (not shown).
  • the tubular charge is wound onto a mandrel of from 200-250mm diameter to form a coil having an external diameter of about 450mm which is secured with a tie or adhesive tape to prevent unravelling.
  • Coiled charges are then packed in boxes in multiples of four to eight for safe transport. It will be readily apparent to a skilled addressee that the above method enables custom manufacture of tubular charges to any required length without any change in apparatus set up or procedures.
  • FIG 5 shows an alternative embodiment of the manufacturing process utilising a liquid or paste-like water gel or emulsion explosive.
  • a slurry pump 30 such as a "Mono" (Trade
  • Mark is coupled to a four metre long hollow mandrel 31 over which a hollow semi-rigid tube 32 is closely fitted.
  • tube 32 is fitted with an enlarged end 33 which may be integrally formed by thermo-forming or it may be a moulded hollow body attachable to tube 32 by heat sealing, adhesive, threaded connection or the like.
  • a detonating cord 34 extends from a reel 35 over an idler 36 and into mandrel 31 at the base of pump 30 via a gland 37 and is connected to bung closure 38 in a manner as described with reference to FIG 3.
  • a liquid or paste-like explosive composition 39 is then pumped under pressure into the distal end of tube 32 and as the interior fills, tube 11
  • the semi-rigid tube may be comprised of any suitable material such as plastics or rubbers including poly vinyl chloride, polyethylene, polypropylene butyl rubber or any other homopoiymeric or copolymeric materials suited for the intended purpose.
  • tubular explosives charges according to the invention are not so flexible that they cannot readily be loaded into inclined or horizontal boreholes, it is equally important that they be not so stiff that they cannot be coiled without kinking into conveniently sized packages for storage, transport and handling.
  • the requisite properties of the semi-rigid tube may be modified by using a thinner wall with a more rigid polymer or vice versa.
  • increased rigidity may be imparted to an otherwise too flexible tube by incorporation of elongate ribs in the wall during manufacture by, say, extrusion.
  • the outer wall has a smooth surface to assist in insertion in boreholes.
  • the interior wall has a smooth surface to avoid interference with packing of the particulate composition. 12
  • the stiffness or rigidity of the tube is such that when coiled, the tube does not kink to form a reduction in cross sectional area or even a discontinuity in the mass of explosive composition as this may create a situation analogous with gapping as in prior art systems.
  • a low-medium density polyethylene tube having an external diameter of 20- 21mm and a wall thickness of 1mm can be coiled over a 200mm winding mandrel without kinking and stored for long periods of time without developing a permanent set which resists elastic recovery to a generally straight elongate tube.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

La présente invention concerne une charge d'explosifs enroulable oblongue (1) constituée d'un tube en plastique semi-rigide (2) comportant une fermeture (4, 7) à chaque extrémité, un cordeau détonateur (5) s'étendant longitudinalement à l'intérieur du tube entre ses extrémités opposées, ainsi qu'une composition explosive occupant pratiquement une petite partie du tube située à son extrémité proximale. L'extrémité proximale du tube est constituée d'une surface de diamètre élargie (14) permettant d'assurer pendant l'utilisation une surface dotée d'une énergie explosive accrue à proximité d'une crosse de trou de sonde.
PCT/AU1999/000134 1998-03-04 1999-03-04 Cartouche explosive oblongue enroulable WO1999045337A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU28202/99A AU2820299A (en) 1998-03-04 1999-03-04 Coilable elongate blasting cartridge

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPP2149A AUPP214998A0 (en) 1998-03-04 1998-03-04 Improvements in packaging of hazardous or sensitive chemicals in plastic tubing
AUPP2149 1998-03-04
AUPP6299A AUPP629998A0 (en) 1998-10-05 1998-10-05 Variable diameter explosives tubing & bung
AUPP6299 1998-10-05

Publications (1)

Publication Number Publication Date
WO1999045337A1 true WO1999045337A1 (fr) 1999-09-10

Family

ID=25645725

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1999/000134 WO1999045337A1 (fr) 1998-03-04 1999-03-04 Cartouche explosive oblongue enroulable

Country Status (1)

Country Link
WO (1) WO1999045337A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7210409B2 (en) 2003-02-03 2007-05-01 Johnson Hi-Tech (Australia) Pty. Modular explosives cartridge and novel spider construction
US20120318122A1 (en) * 2011-06-16 2012-12-20 Poly-Clip System Gmbh & Co., Kg Explosives containing detonating devices
US9207055B2 (en) 2013-02-07 2015-12-08 Dyno Nobel Inc. Systems for delivering explosives and methods related thereto
CN106949796A (zh) * 2017-04-27 2017-07-14 福建海峡科化富兴建设工程有限公司 一种提高塑膜包装乳化炸药传爆可靠性方法及装置
WO2020028952A1 (fr) * 2018-08-08 2020-02-13 Trouperdale Pty Ltd Chemisage de trou de mine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949673A (en) * 1974-04-16 1976-04-13 E. I. Dupont De Nemours And Company Semi-rigid sinuous blasting charge and borehole loading method
AU2162477A (en) * 1976-02-05 1978-08-03 Arci Limited Filling tubular container
AU3339084A (en) * 1983-09-23 1985-03-28 Dynamit Nobel Aktiengesellschaft Industrial cartridge
AU1070592A (en) * 1991-02-04 1992-08-06 Specialised Polyurethane Applications Pty. Limited Waterproof device for holding explosives in a borehole and method for using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949673A (en) * 1974-04-16 1976-04-13 E. I. Dupont De Nemours And Company Semi-rigid sinuous blasting charge and borehole loading method
AU2162477A (en) * 1976-02-05 1978-08-03 Arci Limited Filling tubular container
AU3339084A (en) * 1983-09-23 1985-03-28 Dynamit Nobel Aktiengesellschaft Industrial cartridge
AU1070592A (en) * 1991-02-04 1992-08-06 Specialised Polyurethane Applications Pty. Limited Waterproof device for holding explosives in a borehole and method for using the same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7210409B2 (en) 2003-02-03 2007-05-01 Johnson Hi-Tech (Australia) Pty. Modular explosives cartridge and novel spider construction
US20120318122A1 (en) * 2011-06-16 2012-12-20 Poly-Clip System Gmbh & Co., Kg Explosives containing detonating devices
US9207055B2 (en) 2013-02-07 2015-12-08 Dyno Nobel Inc. Systems for delivering explosives and methods related thereto
US9435625B2 (en) 2013-02-07 2016-09-06 Dyno Nobel Inc. Systems for delivering explosives and methods related thereto
US9638505B2 (en) 2013-02-07 2017-05-02 Dyno Nobel, Inc. Systems for delivering explosives and methods related thereto
US10495432B2 (en) 2013-02-07 2019-12-03 Dyno Nobel Inc. Systems for delivering explosives and methods related thereto
US11346642B2 (en) 2013-02-07 2022-05-31 Dyno Nobel Inc. Systems for delivering explosives and methods related thereto
CN106949796A (zh) * 2017-04-27 2017-07-14 福建海峡科化富兴建设工程有限公司 一种提高塑膜包装乳化炸药传爆可靠性方法及装置
WO2020028952A1 (fr) * 2018-08-08 2020-02-13 Trouperdale Pty Ltd Chemisage de trou de mine
US11549788B2 (en) 2018-08-08 2023-01-10 Trouperdale Pty Ltd Blast hole liner

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