US3878897A - Process and device for creating triggered stop barriers in mines and in various underground works - Google Patents

Process and device for creating triggered stop barriers in mines and in various underground works Download PDF

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Publication number
US3878897A
US3878897A US400665A US40066573A US3878897A US 3878897 A US3878897 A US 3878897A US 400665 A US400665 A US 400665A US 40066573 A US40066573 A US 40066573A US 3878897 A US3878897 A US 3878897A
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United States
Prior art keywords
mass
extinguishing
passage
creating
cells
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US400665A
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English (en)
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Pierre R Goffart
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P R B SA SA
Saprb SA
Gechem SA
Cooper Industries LLC
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P R B SA SA
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Assigned to COOPER INDUSTRIES, INC. reassignment COOPER INDUSTRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CAMERA IRON WORKS USA, INC., A CORP OF DE
Assigned to GECHEM, SOCIETE ANONYME reassignment GECHEM, SOCIETE ANONYME CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). DECEMBER 21, 1990 - FRENCH Assignors: S.A. PRB, SOCIETE ANONYME
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
    • E21F5/14—Fluid barriers or rock dusters made to work by, or at the same time as, shots or explosions
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/02—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires

Definitions

  • ABSTRACT The invention pertains to a process for creating trig- 211 Appl. No.: 400,665
  • gered stop barriers as an extinguishing means in the various underground works. It comprises galleries of the expulsion, by expansion of gas or of steam under pressure by means of an appropriate source of energy.
  • the invention further pertains to devices for working above-mentioned process.
  • the prevention of blazes and firedamp explosions consists in sufficient ventilation of the underground works and of all their locations, so as to prevent all accumulations of gas and to assure a sufficient dilution of the firedamp in air down to contents which are clearly below the lower limits of inflammability.
  • the protection against dust explosions consists in rendering inoffensive the deposited dust, which it may always feared would be brought into suspension by some displacing influence of air or other medium, such as for instance the blast produced by a blaze or a firedamp explosion; an inflammable dusty medium may then be created for the intensification of the fire and/or for the spreading thereof; this is then called a firedamp explosion complicated by a coaldust explosion.
  • the coaldust may either be neutralized, for instance by adding a large quantity of inert dust to it (in such a manner that the cloud which it might form with air would no longer be inflammable), or else it may be fixed to the ground or to the walls of the galleries by the application of an appropriate substance (so as to prevent it from being brought into suspension in the atmosphere).
  • stop barriers When a firedamp and/or a coaldust explosion takes place despite the preventive measures, attempts are made to stop the spreading of the fire by means of special devices called stop barriers.”
  • the stop barrier consisted of a certain quantity of incombustible dust distributed in heaps on several boards placed in unstable equilibrium and at a small distance from each other across the upper part of the mine gallery: this is the sterile dust type of stop barrier.
  • the trough systems have been properly studied during the last ten years and have become operational, either in the form of resting troughs or in that of suspended troughs, or as a combination of both these types of forms, so as to build up a stop barrier with concentrated water troughs (i.e., at a small distance from each other).
  • stop barriers with spread out water troughs which are more convenient and of a more flexible and practical application with respect to the modification in length of the galleries caused by the advance of the underground excavation operations, have revealed technical advantages which are particular to them: namely, any explosion occurring on the works will travel over a smaller length of gallery before being stopped when the protection is provided by means of water trough stop barriers which are spread out, rather than by water trough stop barriers which are concentrated.
  • the liquid is contained in troughs which liberate their content under the influence of the blast of the explosion; it is hoped in this way to be able to put out the flame, the front of which reaches the section where the troughs concerned are installed a few instants after the blast wave front has passed.
  • the desired effect is obtained as long as the propagation speed of the explosion does not exceed a few hundred meters per second.
  • the stop barrier will be ineffective, and the flame front, practically coupled with the blast front, will pass beyond.
  • it will then be necessary to predisperse a sufficient quantity of extinguishing agent there (preferably water) at the appropriate time.
  • a blast front and/or flame front detector is installed upstream of the gallery section containing the extinguishing device; the latter will then be operated by means of energy liberated from a source provided for this purpose by the action of aforesaid detector; in this manner we have a triggered stop barrier. made up of a detector and of an extinguishing device.
  • Extinguishing devices for triggered stop barriers consist of troughs of water or of sterile dust, each containing a detonator with detonating cord located within the extinguishing matter to be dispersed.
  • the troughs of such a system may of course be placed in the gallery either in concentrated or in spread out fashion.
  • stop barriers built up in this manner in gallery sections of more or less great length may be efficient, except however in one or other of the following cases:
  • the source of energy used for dispersing the extinguishing agent should not be harmful to the security at the spot or to the safety of the personnel in case of operation, and in the case of an accidental triggering.
  • a detonating cord located with its detonator within the mass of liquid contained as such in a container located in an underground gallery even if the detonating cord is fitted in an appropriate pipe which is intended to break in order to allow the explosion products to be dispersed in the liquid.
  • the operation does indeed cause a pressure peak in the vicinity of the container which. according to the characteristics of the device used. is:
  • a first object of the invention is concerned with a process for the setting up of triggered stop barriers as extinguishing means in the galleries of underground works. characterized by the fact that it consists in expulsing by expansion of gas or of steam under pressure and by means of an appropriate source of energy. an extinguishing product contained in the cells of a mass of some reticular substance.
  • a further subject of the invention consists of any extinguishing device which applies aforesaid process and which is characterized by the fact that it is made up of at least one mass of reticular substance, an extinguishing product housed in the cells of aforesaid mass and a means for producing the expansion of a gas or of steam under pressure, causing the expulsion of aforesaid extinguishing product.
  • FIG. 1 schematically shows a longitudinal crosssection of part of a gallery which is equipped with a device according to the invention
  • FIG. 2 shows a cross-section on line II--II in FIG. 1;
  • FIG. 3 shows. to a larger scale, that part of FIG. 1 which is indicated at F3;
  • FIG. 4 shows a cross-section on line IVIV in FIG. 3;
  • FIGS. 5 to 11 reproduce the main features of various photographs taken at high speed and showing the progressive space occupation of the extinguishing product.
  • FIGS. 1 to 4 schematically illustrate a section of gallery 1 and an extinguishing device 2 according to the invention.
  • Gallery 1 is supposed to be of the average kind and to be built under circumstances and with the means which are traditionally known.
  • the extinguishing device consists of a prismatic mass 3 of reticulated polyurethane foam. of 100 X X 20 cm, threaded on a detonating cord 4 and enveloped in a thin polyethylene skin 5.
  • This skin 5 is closed at its ends by bindings shown schematically at 6 and 7; at least one of aforesaid cord is extended to the outside of aforesaid skin and is provided with a detonator (known) schematically shown in 8.
  • Skin 5, as well as all the cells of reticular mass 3, are filled with an extinguishing liquid, for instance water, in the case under consideration to the extent of some 45 liters.
  • variable shapes and dimensions can be given to aforementioned device, either one single length of considerable dimensions or a series of successive elements, for instance such as has just been described.
  • the extinguishing device may appropriately be located in the gallery in any adequate manner. In the present case it is borne by a shelf 9 which is slung by cables 10 from the ceiling of gallery 1.
  • Aforesaid device may also be protected by a network or by some thin wall of any appropriate material.
  • the device of chosen length which may eventually consist of several elements grouped in series and/or in parallel. may be located along the mine galleries starting from the detector, downstream as well as upstream so as to take into account the direction of progression of an eventual firedamp and/or coaldust explosion, so as to form a continuous or noncontinuous extinguishing device, which starts to operate over its entire length when the detonation cord is fired at its own detonation speed (4,000 to 8,000 m/s according to type). It can thus be understood that:
  • EXAMPLE With a device having the dimensions described above. built over one meter length and by means of reticulated foam having 8 to 15 cells per linear inch, a normal detonation cord of 11 grams of penthrite per metre, these elements being contained with 45 litres of water in a polyethylene skin with a thickness of 3/10 mm (skin with a flat width of 40 cm). the lot being placed along the symmetry axis of a vaulted gallery with 9 m cross-section upon a cradle of metal rods at 50 cm under the crown. as indicated in FIGS. 1 to 4; it was found by filming at 4.000 images per second that the dispersed water occupies (FIGS.
  • a device for extinguishing fires and explosions in an underground passage comprising:
  • pressure means embedded within said mass for creating internal pressure therein to expel said medium from said mass and disperse the same in said passage.
  • a device as defined in claim 2 wherein said cellular mass has between 5 and 50 cells per linear inch.
  • said explosive device comprises a detonator cord extending through said mass and having a detonator on at least one end thereof.
  • a device as defined in claim 2 including an envelope of readily rupturable material enclosing said mass of cellular material.
  • a device as defined in claim 2 wherein said mass is a prismatic body of polyurethane foam of about 20X20 l00cm enclosed in polyethylene envelope and having a detonating cord extending longitudinally therein, one end of said cord having a detonator thereon.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
US400665A 1972-09-25 1973-09-25 Process and device for creating triggered stop barriers in mines and in various underground works Expired - Lifetime US3878897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU66154 1972-09-25

Publications (1)

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US3878897A true US3878897A (en) 1975-04-22

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US (1) US3878897A (fr)
DE (1) DE2347870C3 (fr)
FR (1) FR2213411B1 (fr)
GB (1) GB1396446A (fr)
LU (1) LU66154A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451178A (en) * 1981-07-21 1984-05-29 The United States Of America As Represented By The Secretary Of The Army Method for dispersing or arresting lava flow
US4462319A (en) * 1982-10-27 1984-07-31 Detector Electronics Corp. Method and apparatus for safely controlling explosions in black liquor recovery boilers
US5119877A (en) * 1990-07-19 1992-06-09 The United States Of America As Represented By The Secretary Of The Interior Explosion suppression system
WO1992017244A1 (fr) * 1991-04-08 1992-10-15 Vsesojuzny Nauchno-Issledovatelsky Institut Protivopozharnoi Oborony Procede et dispositif permettant de produire un melange d'extinction du feu
DE19638626A1 (de) * 1996-09-20 1998-03-26 Amtech R Int Inc Feuerlöschanlage
RU2115451C1 (ru) * 1996-09-20 1998-07-20 Закрытое акционерное общество "Техно-ТМ" Система пожаротушения
US5894891A (en) * 1994-08-08 1999-04-20 Amrona Ag Method and device for extinguishing fires
US6012532A (en) * 1998-05-12 2000-01-11 Kiefer; Karl F. Method and apparatus for prevention, suppression or mitigation of explosions in confined subterranean chambers
WO2000029069A1 (fr) * 1998-11-12 2000-05-25 Benigno Garcia Calvo Extincteur pour containers de produits inflammables ou installations de traitement des hydrocarbures a toit flottant
CN1109807C (zh) * 1999-04-06 2003-05-28 劳埃德斯－蒙坦股份有限公司 塑料袋防爆障及其安装方法
US7334644B1 (en) 2007-03-27 2008-02-26 Alden Ozment Method for forming a barrier
RU2337738C1 (ru) * 2007-03-05 2008-11-10 Владимир Георгиевич Казанцев Огнепреградитель
US10612379B2 (en) * 2017-12-07 2020-04-07 China University Of Mining And Technology Combined automatic anti-explosion method for gas drainage pipeline
RU2773473C1 (ru) * 2021-09-15 2022-06-06 Публичное акционерное общество "Транснефть" (ПАО "Транснефть") Комплексная система обеспечения целостности резервуара

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140375A1 (de) * 1981-10-10 1983-04-28 Ruhrkohle Ag, 4300 Essen Einrichtung zum untertaegigen explosionsschutz
DE3248025C2 (de) * 1982-12-24 1985-08-29 Vkv Kunststoffanwendung Gmbh, 4660 Gelsenkirchen-Buer Winddruckschalteranordnung für Wassertrogsperren
DE29600377U1 (de) * 1996-01-11 1996-04-04 Ruhrkohle Ag, 45128 Essen Vorrichtung zum Aufhängen und Aufstellen von als Explosionssperre dienenden Wassertrögen im Untertagebergbau und Tunnelbau
RU2150006C1 (ru) * 1998-07-21 2000-05-27 Открытое акционерное общество по добыче угля "Воркутауголь" Способ борьбы с подземным пожаром
DE102007014908A1 (de) 2007-03-26 2008-10-02 Rembe Gmbh Safety + Control Vorrichtung gegen die Ausbreitung von Explosionen, insbesondere Staubexplosionen
CN112861681B (zh) * 2021-01-29 2023-04-07 长兴云尚科技有限公司 一种基于云端处理的管廊视频智能分析方法及系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1119799A (en) * 1913-09-15 1914-12-08 Charles M Bowman Fire-extinguisher.
US3040815A (en) * 1960-06-03 1962-06-26 Pambello Samuel Michael Fire extinguishing apparatus
US3482637A (en) * 1967-10-20 1969-12-09 Us Interior Process and method for quenching incipient gas-air explosions

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364097A (en) * 1964-07-03 1968-01-16 Weyerhaeuser Co Fire-resistant panel systems
US3654996A (en) * 1969-09-12 1972-04-11 Michael Naglowsky Ceiling construction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1119799A (en) * 1913-09-15 1914-12-08 Charles M Bowman Fire-extinguisher.
US3040815A (en) * 1960-06-03 1962-06-26 Pambello Samuel Michael Fire extinguishing apparatus
US3482637A (en) * 1967-10-20 1969-12-09 Us Interior Process and method for quenching incipient gas-air explosions

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451178A (en) * 1981-07-21 1984-05-29 The United States Of America As Represented By The Secretary Of The Army Method for dispersing or arresting lava flow
US4462319A (en) * 1982-10-27 1984-07-31 Detector Electronics Corp. Method and apparatus for safely controlling explosions in black liquor recovery boilers
US5119877A (en) * 1990-07-19 1992-06-09 The United States Of America As Represented By The Secretary Of The Interior Explosion suppression system
WO1992017244A1 (fr) * 1991-04-08 1992-10-15 Vsesojuzny Nauchno-Issledovatelsky Institut Protivopozharnoi Oborony Procede et dispositif permettant de produire un melange d'extinction du feu
US5894891A (en) * 1994-08-08 1999-04-20 Amrona Ag Method and device for extinguishing fires
DE19638626A1 (de) * 1996-09-20 1998-03-26 Amtech R Int Inc Feuerlöschanlage
RU2115451C1 (ru) * 1996-09-20 1998-07-20 Закрытое акционерное общество "Техно-ТМ" Система пожаротушения
DE19638626C2 (de) * 1996-09-20 1998-12-24 Amtech R Int Inc Feuerlöschanlage
EP0838240A2 (fr) 1996-09-20 1998-04-29 R-Amtech International, Inc. Installation d'extinction d'incendie
US5915480A (en) * 1996-09-20 1999-06-29 R-Amtech International, Inc. Fire extinguishing system
US6012532A (en) * 1998-05-12 2000-01-11 Kiefer; Karl F. Method and apparatus for prevention, suppression or mitigation of explosions in confined subterranean chambers
WO2000029069A1 (fr) * 1998-11-12 2000-05-25 Benigno Garcia Calvo Extincteur pour containers de produits inflammables ou installations de traitement des hydrocarbures a toit flottant
ES2162543A1 (es) * 1998-11-12 2001-12-16 Calvo Benigno Garcia Extintor para contenedores de productos inflamables o instalaciones de hidrocarburos con techo flotante.
CN1109807C (zh) * 1999-04-06 2003-05-28 劳埃德斯－蒙坦股份有限公司 塑料袋防爆障及其安装方法
RU2337738C1 (ru) * 2007-03-05 2008-11-10 Владимир Георгиевич Казанцев Огнепреградитель
US7334644B1 (en) 2007-03-27 2008-02-26 Alden Ozment Method for forming a barrier
US10612379B2 (en) * 2017-12-07 2020-04-07 China University Of Mining And Technology Combined automatic anti-explosion method for gas drainage pipeline
RU2773473C1 (ru) * 2021-09-15 2022-06-06 Публичное акционерное общество "Транснефть" (ПАО "Транснефть") Комплексная система обеспечения целостности резервуара

Also Published As

Publication number Publication date
FR2213411A1 (fr) 1974-08-02
DE2347870B2 (de) 1975-05-22
DE2347870C3 (de) 1976-01-08
LU66154A1 (fr) 1974-04-02
FR2213411B1 (fr) 1977-05-27
GB1396446A (en) 1975-06-04
DE2347870A1 (de) 1974-04-18

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Owner name: COOPER INDUSTRIES, INC., 1001 FANNIN, HOUSTON, TX

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