EP0206946B1 - Dispositif d'arrêt de la détonation pour transfert de matières explosives en vrac - Google Patents

Dispositif d'arrêt de la détonation pour transfert de matières explosives en vrac Download PDF

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Publication number
EP0206946B1
EP0206946B1 EP86401384A EP86401384A EP0206946B1 EP 0206946 B1 EP0206946 B1 EP 0206946B1 EP 86401384 A EP86401384 A EP 86401384A EP 86401384 A EP86401384 A EP 86401384A EP 0206946 B1 EP0206946 B1 EP 0206946B1
Authority
EP
European Patent Office
Prior art keywords
tube
central channel
explosives
explosive
detonation
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.)
Expired
Application number
EP86401384A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0206946A1 (fr
Inventor
Pierre Vuillaume
Didier Gaston
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.)
Charbonnages de France CDF
Original Assignee
Charbonnages de France CDF
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
Application filed by Charbonnages de France CDF filed Critical Charbonnages de France CDF
Priority to AT86401384T priority Critical patent/ATE46035T1/de
Publication of EP0206946A1 publication Critical patent/EP0206946A1/fr
Application granted granted Critical
Publication of EP0206946B1 publication Critical patent/EP0206946B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/10—Feeding explosives in granular or slurry form; Feeding explosives by pneumatic or hydraulic pressure

Definitions

  • the present invention relates to a device for detonating a detonation for a system for transferring explosive substances in bulk.
  • the solution currently adopted to limit the risks of transmission of the detonation through the loading cannula consists in limiting the diameter thereof to a value less than the critical detonation diameter of the pumped explosive (see for example the article by M. COOK: “EXPLOSIVES - A survey of Technical Advances in Industrial and Engineering Chemistry Vol. 60, N ° 7, July 1968, pp 44-55): indeed the critical detonation diameter of an explosive is a value of the diameter of a cylindrical charge of this explosive below which the detonation is unable to propagate in the charge.
  • Limiting the diameter of the cannulae to 25 mm has the effect of significantly reducing the pumping rate and correspondingly increasing the loading time of the mines.
  • the duration of exposure of personnel to the risks of untimely departure is thereby increased, and the economic benefit of transferring explosives in bulk by pumping can be called into question, in particular in the case of open pit fires by vertical mines deep with priming down the hole.
  • the choice of the critical detonation diameter as a criterion for limiting the diameter of the cannulas is questionable: the value of the critical detonation diameter, which is an intrinsic characteristic of 'a given explosive, is determined under specific experimental conditions (in light cartridge, standardized density, ...), and generally "once and for all" during the approval examination of the product. It is not certain that this characteristic is representative of the explosive under its normal conditions of use.
  • the invention aims to stop the detonation between an explosive transfer system and a reservoir of these materials explosives.
  • the present invention provides for this purpose a device installed on a bulk explosive material transfer system, of the type which comprises a transfer cannula in connection with at least one reservoir.
  • explosive substances in bulk and intended to fill a receptacle, at least in part, with explosive substances characterized in that in this cannula is disposed, over at least part of its length, a concentric central channel defining an annular section of flow of explosive, and, inside it, an elongated empty space suitable for allowing, in the event of an untimely explosion, by channel effect, propagation of the fumes, in the opposite direction to the flow of explosive , in front of the detonation front resulting from the said explosion.
  • the known art device represented in FIG. 1 comprises two reservoirs 10 containing a certain amount of explosive 11, a cannula 13 starting from these reservoirs, a reel 12 of cannula 13 and a pump 14 arranged on a truck 15.
  • the free end 16 of the cannula 13 descends into a vertical blast hole 17, at the bottom of which a detonator 18 has previously been placed.
  • a trigger device 19 located on the surface is connected to this detonator 18 by any known means.
  • the end of the cannula is at the bottom of the blast hole 17, it then rises gradually, for example by means of a progressive rewinding of the cannula 13 on the reel 12, to always remain in contact with the surface explosive spilled into the blast hole.
  • the explosion control is carried out remotely using the trigger device 19.
  • the solution of the known art consists in limiting the diameter of the cannula below a threshold corresponding to the critical detonation diameter of the pumped explosive.
  • FIG. 2 A variation curve of this critical detonation diameter with the density under normal pressure is shown in FIG. 2 for two pumpable explosives of the slurry type.
  • the device of the invention allows, in the event of an untimely explosion, to stop the detonation before it reaches the stock of explosive. This device tolerates fluctuations in the critical diameter of the pumped explosive and does not affect the pumping rate.
  • the device of the invention comprises a concentric central channel 22 disposed inside the cannula 13 over at least a part of its length. This channel is held in place by centering rings 23.
  • the device according to the invention takes advantage of a phenomenon called "channel effect": in fact, when a charge detonates under confinement and an empty space of small dimension is provided in the charge or between the charge and the confinement, the fumes produced by the decomposition of the explosive can reach a speed greater than the detonation speed of the explosive. The fumes then propagate in the empty space in front of the detonation front. Their pressure is such that they can desensitize the explosive by compression, causing the detonation to stop.
  • FIG. 4 shows the direction 24 of flow of the explosive and the direction 25 of propagation of the fumes in the event of an untimely explosion in the blast hole, the cannula being still disposed therein.
  • the difference in length between the outer tube 26 and the central core 27 aims to provide a length of 250 mm allowing the detonation to reach its steady state.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Air Bags (AREA)
  • Feeding Of Articles To Conveyors (AREA)
  • Air Transport Of Granular Materials (AREA)
EP86401384A 1985-06-26 1986-06-24 Dispositif d'arrêt de la détonation pour transfert de matières explosives en vrac Expired EP0206946B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401384T ATE46035T1 (de) 1985-06-26 1986-06-24 Einrichtung zum unschaedlichmachen von explosionen beim foerdern fliessfaehiger explosivstoffe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8509719A FR2584178B1 (fr) 1985-06-26 1985-06-26 Dispositif d'arret de la detonation pour transfert de matieres explosives en vrac
FR8509719 1985-06-26

Publications (2)

Publication Number Publication Date
EP0206946A1 EP0206946A1 (fr) 1986-12-30
EP0206946B1 true EP0206946B1 (fr) 1989-08-30

Family

ID=9320686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401384A Expired EP0206946B1 (fr) 1985-06-26 1986-06-24 Dispositif d'arrêt de la détonation pour transfert de matières explosives en vrac

Country Status (9)

Country Link
US (1) US4699060A (xx)
EP (1) EP0206946B1 (xx)
JP (1) JPS6210600A (xx)
AT (1) ATE46035T1 (xx)
AU (1) AU579552B2 (xx)
CA (1) CA1261675A (xx)
DE (1) DE3665360D1 (xx)
FR (1) FR2584178B1 (xx)
ZA (1) ZA864639B (xx)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE462508B (sv) * 1988-03-15 1990-07-02 Bengt Raadman Foerfarande och anordning foer infoerande av spraengaemne i borrhaal
US5352429A (en) * 1992-07-14 1994-10-04 The United States Of America As Represented By The Secretary Of The Navy Dynamic compaction processing system
AUPM980994A0 (en) * 1994-12-02 1994-12-22 Ici Australia Operations Proprietary Limited Apparatus and process for explosives blow loading
NO307717B1 (no) * 1997-09-12 2000-05-15 Dyno Ind Asa Fremgangsmåte for lading og sensitivisering av et slurrysprengstoff i et borhull
US6412415B1 (en) * 1999-11-04 2002-07-02 Schlumberger Technology Corp. Shock and vibration protection for tools containing explosive components
US6401588B1 (en) * 2000-02-17 2002-06-11 Dyno Nobel Inc. Delivery of emulsion explosive compositions through an oversized diaphragm pump
ZA200104658B (en) * 2000-07-03 2001-12-12 Sasol Chemical Ind Ltd Method and system for delivery of water-based explosives.
US7660916B2 (en) * 2005-06-16 2010-02-09 Agere Systems Inc. Emulation of independent active DMA channels with a single DMA capable bus master hardware and firmware
US7971534B2 (en) 2005-09-19 2011-07-05 Waldock Kevin H Mobile platform for the delivery of bulk explosive
ES2955739A1 (es) * 2022-04-28 2023-12-05 Blast Consult S L Sistema y procedimiento de carga de explosivo en barrenos

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903969A (en) * 1953-05-28 1959-09-15 Maumee Collieries Co Method of blasting
FR1198584A (fr) * 1957-04-25 1959-12-08 Nitroglycerin Ab Dispositif destiné à charger des trous de mines à l'aide d'explosifs
US3064572A (en) * 1958-01-13 1962-11-20 Union Carbide Corp Method of and means for providing a charge of water sensitive explosive in a blast hole
US3713360A (en) * 1971-06-25 1973-01-30 Olin Corp Safety container for explosive powder
US4074629A (en) * 1975-06-25 1978-02-21 Colgate Stirling A Blasting agent and method
DE2602924A1 (de) * 1976-01-27 1977-07-28 Niepmann Ag Walchwil Verfahren und vorrichtung zur herstellung von sprengschlamm
US4102240A (en) * 1977-01-03 1978-07-25 Cook Merrill A Blasting slurry pump truck
US4098189A (en) * 1976-09-28 1978-07-04 Harry Holm Method and apparatus for preparing an explosive charge
SU652324A1 (ru) * 1977-12-15 1979-03-15 Центральное Проектное Конструкторское Технологическое Бюро Министерства Цветной Металлургии Казахской Сср Устройство дл перемещени зар дного шланга по скважине
US4526633A (en) * 1982-11-08 1985-07-02 Ireco Incorporated Formulating and delivery system for emulsion blasting
CA1190421A (en) * 1983-06-09 1985-07-16 Horst F. Marz Charging large diameter vertical boreholes

Also Published As

Publication number Publication date
AU5916386A (en) 1987-01-08
DE3665360D1 (en) 1989-10-05
FR2584178B1 (fr) 1987-12-24
CA1261675A (en) 1989-09-26
JPS6210600A (ja) 1987-01-19
ZA864639B (en) 1987-02-25
US4699060A (en) 1987-10-13
ATE46035T1 (de) 1989-09-15
EP0206946A1 (fr) 1986-12-30
AU579552B2 (en) 1988-11-24
FR2584178A1 (fr) 1987-01-02

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