US2867171A - Mine blasts - Google Patents

Mine blasts Download PDF

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Publication number
US2867171A
US2867171A US420195A US42019554A US2867171A US 2867171 A US2867171 A US 2867171A US 420195 A US420195 A US 420195A US 42019554 A US42019554 A US 42019554A US 2867171 A US2867171 A US 2867171A
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United States
Prior art keywords
liquid
tamping
shell
charge
inhibiting
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 - Lifetime
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US420195A
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English (en)
Inventor
Anatole A K A Edgard Demelenne
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Individual
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Individual
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Publication of US2867171A publication Critical patent/US2867171A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • 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
    • F42D1/20—Tamping cartridges, i.e. cartridges containing tamping material
    • 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
    • F42D1/24—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor characterised by the tamping material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D3/00—Particular applications of blasting techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless

Definitions

  • This invention relates to 'blasting in mines, and more particularly concerns means whereby such blasting may be effected with greater security and in a simpler manner than heretofore, while at the same ⁇ time providing in addition for improved working conditions in the mines Where these blasts are effected.
  • the action of the selected inhibiting liquid may be improved by the judicious addition of materials or substances having by themselves an inhibiting effect on the inflammation, as for example sodium chloride or calcium chloride which are knownto possess this property.
  • the liquid of the charge serving as a tamping may also act, at least in part, for laying down the dust of the blast.
  • liquid use may be made of any non-inammable liquid and naturally of any inflammation inhibiting liquid, together with the addition of materials or substances having by themselves an inflammation inhibiting action, preferably in a soluble or dissolved form.
  • the quantity of liquid to be used may vary in accordance with the tamping to 'be made and the other conditions of blasting.
  • the quantity of liquid provided for the tamping may be modified accordingly.
  • Means may be provided for amplifying .the effects referred to, thus improving the conditions making for safety and health in the mines.
  • the liquid used as tamping comprises materials or substances able to attenuate or suppress the toxicity of .the gases and fumes evolved by the explosion, in particular materials or substances which, by reaction with poisonous gases, such for example as CO, NO, NO2 or SO2, render the latter innocuous or less noxious.
  • poisonous gases such for example as CO, NO, NO2 or SO2
  • the manner in which the presence of the inhibiting liquid is ensured at the moment the detonation takes place may vary, but it is convenient to arrange the inhibiting liquid in the form of portable charges.
  • liquid charge is mainly intended to serve as a tamping
  • this charge is a portable element.
  • Figs. l and 2 illustrate in plan View and end View, respectively, an enveloped liquid charge
  • Figs. 3 and 4 illustrate in ⁇ plan View with parts broken away, and end view, respectively, a modified construction of enveloped liquid charge
  • Figs. 5 to 7 illustrate Various arrangements of ⁇ blasting cartridges and liquid charges' in mine holes.
  • the liquid is introduced within a shell 1 which is sealed or otherwise closed and the cross section ⁇ of which is made to conform to the mine hole, the constitutive material yof the shell being water-proof and not giving rise to llame firing in order to avoid combustion of portions of the shell that could last after the explosion, and, preferably, being flexible.
  • the sealing of the shell may able means such as associated closure members, sticking welding, and particularly autogenous Welding, as shown at in and 1b.
  • spots or coverings such as those designated by 1c may be formed on theshell by means of a fluorescent or phosphorescent or light reflecting product or paint.
  • a fluorescent or phosphorescent or light reflecting product or paint may be formed on theshell by means of a fluorescent or phosphorescent or light reflecting product or paint.
  • the shell is made of transparent or translucent material, a phosphorescent or fluorescent substance may be incorporated in the liquid therein.
  • the tamping may bev provided with la first shell 1 containing the liquid, which shell may be made of a more frangible material, for example a thin synthetic plastic material, and this first shell may be surrounded with a second shell 1d- Figs. 3 and 4-which may act as a protective shell and is then to be adapted for correctly vwithstanding the handling operations while, at suitable selected locations, the protective sell may be removed to uncover the first shell and thereby allow for the indicating means 1c associated with ythe rst shell 1 to be displayed.
  • la first shell 1 containing the liquid which shell may be made of a more frangible material, for example a thin synthetic plastic material
  • this first shell may be surrounded with a second shell 1d- Figs. 3 and 4-which may act as a protective shell and is then to be adapted for correctly vwithstanding the handling operations while, at suitable selected locations, the protective sell may be removed to uncover the first shell and thereby allow for the indicating means 1c associated with ythe rst shell 1
  • the protective shellf1d maybe made of metal, cardboard, or synthetic plastic material, and shaped in the form of atube open at the ends where it permits the ends of the iirst shell to be observed.
  • Example 1 Referring to Figs. 5 to 7 and first to Figs. 5 and 6, whatever the purpose, for injection and, or for mining one may proceed as follows: in a mine hole 2 of suitable diameter, for example 40 mm., and appro priate length, there is introduced the cartridge or cartridges of explosive designated 3 and the usual firing devices ldesignated 4, and then a shell enclosed charge 1 of inhibiting liquid as above indicated. The entrance of the hole having preferably been closed by means of a suitable tamping 5, the blasting is effected, causing the shell to be ruptured and permitting the liquid to form the inammation inhibiting atmosphere.
  • liquid charges and of the explosive cartridges in the mine hole could be reversed, as also liquid charges could be placed on either side of an ex plosive charge (Fig. 6), or liquid charges may be caused to alternate with explosive cartridges.
  • injection and inhibiting charges may be formed of different liquids and made separately, all such modifications being naturally within the limits of the invention.
  • the quantity of liquid may be of from 100 to 200 cubic centimeters (cc.) for an explosive charge of about 100 grs., but in some cases a smaller quantity of liquid may be used.
  • the quantity of liquid will be normally higher and as high as possible, giving in any case the desired inhibiting effect; for example the quantity of liquid may be from 500 to 800 cc. or more for au explosive charge of about 100 grs.
  • the following inammation inhibiting tests have been made:
  • Example II In the boring of a level or gallery in hard schists inclined at 70 to the horizontal, having a normal cross section of 3.5 m. width at the base and 3 m. height, and comprising at about the middle of the height a coal layer having an opening of 0.6 m., upon removal of the layer on 1.2 rn. in front of the working face, four mine holes are bored in the bed of lesser thickness and lesser hardness of the wall of the layer and eight mine holes are bored in the bed of the roof.
  • a Four of the mine holes of the roof are then loaded as illustrated in Fig. 7 with 4 cartridges of dynamite 3 provided with an instantaneous fuse 4 and against thel explosive there is then pushed a tube 1 made of synthetic plastic material having a length of 40 cm. and a diameter of 35 mm., sealed at its ends and containing about 370 cubic centimeters of water.
  • a tube 1 made of synthetic plastic material having a length of 40 cm. and a diameter of 35 mm., sealed at its ends and containing about 370 cubic centimeters of water.
  • the mining of the rock takes place normally, the same as with the tamping of closely packed clay of 40 cm. length as commonly made.
  • wetting products may be used and employed at the dose of 'about 0.1%, and good results have been obtained with a wetting product containing ethylene oxide as a base.
  • Example IV In a tamping of which water is the constituent, there is added oxides, for example Fe203, in a proportion of about 1%, or carbonatos, for example CaCO3 or Na2CO3, in a proportion of about 2%, these oxides or carbonates being preferably incorporated in the tamping liquid formed as a saline solution containing alkali chloride, for example at the dose of 5 to 10%.
  • oxides for example Fe203
  • carbonatos for example CaCO3 or Na2CO3
  • these oxides or carbonates being preferably incorporated in the tamping liquid formed as a saline solution containing alkali chloride, for example at the dose of 5 to 10%.
  • alkali chloride for example at the dose of 5 to 10%.
  • sodium chloride should be used, which has the advantage of'avoiding the irritation of the throat.
  • Example V To the tamping liquid there is added together a wetting agent and products as in Example IV.
  • oxidising agents such, for example, as potassium permanga nate -KMnO4-, or hydrogen peroxide -HgOgin a proportion of about 1%.
  • the .invention as set forth in claim 1 including a second casing, provided with at least one end opening, surrounding the said rst recited casing to act as a protective shell.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Road Repair (AREA)
US420195A 1953-04-10 1954-03-31 Mine blasts Expired - Lifetime US2867171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE754155X 1953-04-10

Publications (1)

Publication Number Publication Date
US2867171A true US2867171A (en) 1959-01-06

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US420195A Expired - Lifetime US2867171A (en) 1953-04-10 1954-03-31 Mine blasts

Country Status (5)

Country Link
US (1) US2867171A (es)
BE (3) BE519126A (es)
FR (1) FR1106681A (es)
GB (1) GB754155A (es)
LU (1) LU32804A1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120174813A1 (en) * 2009-05-06 2012-07-12 Vin Battaglia Modular case ammunition and methods of assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397756A (en) * 1965-07-29 1968-08-20 Du Pont Reduction of explosive shock and noise by dispersion of water particles
ATE94636T1 (de) * 1987-01-14 1993-10-15 Cube Overseas Trading Ltd Verfahren und geraet zum daempfen von sprengladungsdetonationen.

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB127232A (en) * 1918-05-18 Adolphe Jules Paban Henri Improvements in or relating to Luminous Surfaces.
BE515939A (es) *
US60573A (en) * 1866-12-18 Improvement in methods of blasting with nitroleum
US232640A (en) * 1880-09-28 Method of blasting
US358611A (en) * 1887-03-01 John heath and william feost
US748935A (en) * 1904-01-05 Blasts n g-cartridge
GB190909763A (en) * 1909-10-06 1910-04-28 Alfred Tolley A Shot Firing Liquid Safety Cartridge.
US1401328A (en) * 1920-12-10 1921-12-27 Foamite Firefoam Company Fire-extinguishing device
US1776770A (en) * 1926-02-09 1930-09-30 William J Cheley Method for indicating detonation of explosive charges
FR763844A (fr) * 1933-01-31 1934-05-07 Petits Fils Francois Wendel Système explosif et cartouches en comportant application

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE515939A (es) *
US60573A (en) * 1866-12-18 Improvement in methods of blasting with nitroleum
US232640A (en) * 1880-09-28 Method of blasting
US358611A (en) * 1887-03-01 John heath and william feost
US748935A (en) * 1904-01-05 Blasts n g-cartridge
GB190909763A (en) * 1909-10-06 1910-04-28 Alfred Tolley A Shot Firing Liquid Safety Cartridge.
GB127232A (en) * 1918-05-18 Adolphe Jules Paban Henri Improvements in or relating to Luminous Surfaces.
US1401328A (en) * 1920-12-10 1921-12-27 Foamite Firefoam Company Fire-extinguishing device
US1776770A (en) * 1926-02-09 1930-09-30 William J Cheley Method for indicating detonation of explosive charges
FR763844A (fr) * 1933-01-31 1934-05-07 Petits Fils Francois Wendel Système explosif et cartouches en comportant application

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120174813A1 (en) * 2009-05-06 2012-07-12 Vin Battaglia Modular case ammunition and methods of assembly

Also Published As

Publication number Publication date
FR1106681A (fr) 1955-12-21
GB754155A (en) 1956-08-01
BE519126A (es)
BE524457A (es)
BE520488A (es)
LU32804A1 (es)

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