US3837280A - Tamping cartridge made of filled, elongated polymeric tubing - Google Patents

Tamping cartridge made of filled, elongated polymeric tubing Download PDF

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Publication number
US3837280A
US3837280A US00327181A US32718173A US3837280A US 3837280 A US3837280 A US 3837280A US 00327181 A US00327181 A US 00327181A US 32718173 A US32718173 A US 32718173A US 3837280 A US3837280 A US 3837280A
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US
United States
Prior art keywords
tamping
cartridge
filled
cartridges
water
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
Application number
US00327181A
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English (en)
Inventor
H Lewer
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.)
Chemische Fabrik Kalk GmbH
Original Assignee
Chemische Fabrik Kalk GmbH
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 DE19722203488 external-priority patent/DE2203488C/de
Application filed by Chemische Fabrik Kalk GmbH filed Critical Chemische Fabrik Kalk GmbH
Application granted granted Critical
Publication of US3837280A publication Critical patent/US3837280A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F42D1/24—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
    • 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

Definitions

  • water-filled plastics hose lengths or ampoules are generally described as water tamping cartridges.
  • these water tamping cartridges should have an internal pressure of at least 0.1 atm.
  • the wall thickness of the casings for these cartridges should be at least 0.8 mm.
  • cartridges are also used in which the water filling is thickened by a gel-forming substance into a pasty composition of approximately 95 percent water content. Since these cartridges do not have a curved shape, tamping in the bore hole and closure of the bore hole can be achieved only when the cartridge is pierced at one end. Thus, when the ram pushes the cartridge down into the hole, a little of the mixture is forced out of the cartridge, and only then can the cartridge become sufficiently deformed to fill the cross-section of the bore hole.
  • a tamping cartridge for tamping explosive charges in bore holes, particularly in underground mining workings has been found which consists of a hose-like plastics casing filled with finely particulate solids and which is enclosed on all sides.
  • the plastics coating has a wall thickness of about 50 to microns and the filling of finely particulate solid material does not completely fill the space inside the cartridge.
  • Such a thin-walled cartridge the space inside which is not completely filled by finely particulate solid material has, in contrast to the thick-walled tightly waterfilled cartridge, no elasticity of fonn. It is flexible and can, therefore, when it is introduced into the bore hole and pressed firmly against the explosive cartridge, adapt itself to the shape and size of the bore hole. In doing so, it becomes pressed firmly against the wall of the bore hole and thereby tamped.
  • Cartridges in which the finely particulate solid material, with loose filling, essentially fills the volume of the cartridge, have been found to be particularly advantageous.
  • the loose filling of finely particulate solid there remains between the individual particles thereof a space which is not filled by solid material and which for one cartridge as a whole, is large enough to impart the aforementioned properties to this cartridge.
  • the space which is not filled by solid matter is hereinafter described as the empty volume.
  • the plastics casing can in principle be made from any plastics materials from which, without loss of tearing strength and flexibility, hose-shaped structures can be manufactured with a wall thickness of about 50 to 100 microns.
  • Polyolefin plastics such as for example polyethylene, have been found to be particularly suitable.
  • Other suitable plastics are for example polystyrene or polyvinylchloride.
  • cartridge casings from parchment paper, paraffin paper or the like, so long as these materials are satisfactorily tear-resistant and flexible, but the use of plastics foil has been found to be more advantageous.
  • the diameter of these hose-shaped structures should be somewhat but only very slightly smaller than the diameter of the bore hole in which the explosive charge is to tamped. It has furthermore been found to be ideal for the diameter of the hose shaped structure to be somewhat larger than the diameter of the explosive charge which is to be tamped. In the case of the dimensions of currently used explosive cartridges, therefore, the diameter of the cartridge casings to be used according to the invention should be between 25 and 35 mm.
  • hose-shaped casings can be sub-divided into pieces of approximately to 30 mm length and can be closed at one end for example by welding, adhesion or in some other manner.
  • hose-shaped cartridges are formed which are closed at one end and into which then a quantity of finely particulate solids is filled which does not completely fill up the space inside the cartridge.
  • a quantity of finely particulate solids is filled into the cartridge that in the case of loose bulk filling, the space inside the cartridge is just filled. Subsequently, the filling aperture of the tarnping cartridge is likewise sealed by adhesion or welding or in some other manner.
  • a self-closing valve which closes automatically after the finely particulate solids have been filled into the cartridge and so reliably prevents the finely particulate solids from reemerging from the the cartridge.
  • Valves which consist of a possibly funnelshaped portion of hose of the same diameter as the cartridge which is to be sealed and which is fitted into the closure aperture thereof, have been found to be particularly successful. The two outer edges of the valve hose and of the cartridge which is to be sealed are connected firmly to one another.
  • a clamping means which is connected firmly to the cartridge and which consists essentially of two rod-shaped plastics parts which become connected firmly to the cartridge transversely to the longitudinal axis of the cartridge and in the vicinity of the filling aperture and which are so elastic that they constantly endeavour to occupy their greatest longitudinal extension.
  • the tarnping cartridges according to the invention which are sealed all round, are readily storable and transportable.
  • the charge is first introduced into the bore hole together with the necessary detonating means.
  • the tarnping cartridge according to the invention is introduced into the bore hole and rammed so against the charge that the tarnping cartridge is compressed and kinked at several places.
  • This causes the kinked parts of the tarnping cartridge to be displaced obliquely to the longitudinal axis of the bore hole and to jam against the walls thereof.
  • this deformation is a lasting one, so that the tarnping cartridge completely and lastingly closes the cross-section of the bore hole.
  • FIGURE shows a diagrammatic view of a section through a bore hole 2 made in the rock 1, filled with a charge and tamped. It contains the explosive charge 3 provided with detonating means and is tamped by the tarnping cartridge 4 according to the invention. Instead of one tarnping cartridge, if necessary a plurality of tarnping cartridges can be introduced into and tamped in a bore hole.
  • the bore hole diameter is substantially larger than the diameter of the tarnping cartridge and for the tarnping cartridge to be applied under such pressure that it bursts at one or more places.
  • the filling which consists of finely particulate solid substances will then emerge and, by having pressure applied to it, be so well distributed over a larger bore hole diameter that reliable tarnping is achieved.
  • finely particulate solids for use as a filling for the tarnping cartridge according to the invention particularly finely particulate calcium and/or magnesium chloride has proved successful, containing advantageously more than percent by weight of particles with a diameter of less than 1 mm and more than 60 percent by weight of particles with a diameter of less than 0.3 mm.
  • the water content of the calcium chloride or magnesium chloride respectively may be between 55 and 0 percent by weight, i.e., hexa-, tetra-, di-, monohydrates and practically anhydrous substances can be employed.
  • wetting agents in particular non-ionic wetting agents like alkyl-phenolpolyglycolether may be added.
  • alkaline reacting substances such as calcium oxide, calcium hydroxide, calcium carbonate, dolomite, sodium hydroxide, sodium hydrogen carbonate, sodium carbonate, potassium hydroxide, potassium carbonate, potassium hydrogen carbonate, urea and similar substances also proved useful.
  • Calcium chloride or magnesium chloride treated with ammonia, thus reacting alkaline may also be used.
  • oxidizing agents like manganese dioxide, potassium permanganate, has advantageous effects.
  • sodium chloride or another metal salt may be admixed with the materials introduced into the blast-holes.
  • the finely powdered calcium chloride or magnesium chloride apparently combine with the large amounts of water steam forming after the blast. In this way the steam is condensed much faster into water drops which contain liquid calcium chloride or magnesium chloride. This mixture is instrumental in quickly agglomerating the dust, thereby forming particles too big to reach the lungs, also precipitating the dust where it rises. It was also found that nitrous gases dissolve much better in the forming solution than in water steam or small drops that consist of water only. To increase the solubility of nitrous gases in the forming solution, additional alkaline reacting substances may be introduced into the blastholes in addition to calcium chloride or magnesium chloride. The quantities of alkaline substances may be varied for best absorption of nitrous gases. 2-10 percent of alkaline substances, contained in the material introduced into the blast-holes after the explosives, are generally sufficient to reduce, within a few minutes, the concentration of nitrous gases, contained in the air after blasts, far below the harmful limit.
  • a further advantage is the absorption of the precipitated dust which is retained, having been wetted by a solution of hygroscopic salts.
  • the water in the precipitated layer remains bonded, preventing the dust from rising again after further blasts. This danger exists if the dust was precipitated by water only which would eventually evaporate.
  • humidity of air in mines will not increase if materials are used in accordance with the invention.
  • a tamping cartridge for tamping charges in bore holes consisting of an elongated polymeric tubing closed on all sides and almost filled with finely particulate solids, said polymeric tubing having sufficient empty volume to during use permit deformation without rupture, said polymeric tubing having a thickness of about 50 to 100 microns.
  • a tamping cartridge according to claim 1 in which said finely divided particulate solids is selected from the group consisting of calcium chloride and magnesium chloride.
  • a tamping cartridge according to claim 1 in which said polymeric tubing is filled with loose bulk particulate solids.
  • a tamping cartridge according to claim 2 in which said finely divided particulate solids contain more than percent by weight of particles with a diameter less than 1 mm and more than 60 percent by weight of particles with a diameter of less than 0.3 mm.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Sampling And Sample Adjustment (AREA)
US00327181A 1972-01-26 1973-01-26 Tamping cartridge made of filled, elongated polymeric tubing Expired - Lifetime US3837280A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722203488 DE2203488C (de) 1972-01-26 Besatzpatrone und Verfahren zum Besetzen von Sprengladungen in Bohrlöchern

Publications (1)

Publication Number Publication Date
US3837280A true US3837280A (en) 1974-09-24

Family

ID=5834012

Family Applications (1)

Application Number Title Priority Date Filing Date
US00327181A Expired - Lifetime US3837280A (en) 1972-01-26 1973-01-26 Tamping cartridge made of filled, elongated polymeric tubing

Country Status (15)

Country Link
US (1) US3837280A (enrdf_load_stackoverflow)
JP (1) JPS5333650B2 (enrdf_load_stackoverflow)
BE (1) BE794363A (enrdf_load_stackoverflow)
CS (1) CS164793B2 (enrdf_load_stackoverflow)
DD (1) DD103318A5 (enrdf_load_stackoverflow)
ES (1) ES410387A1 (enrdf_load_stackoverflow)
FI (1) FI56275C (enrdf_load_stackoverflow)
FR (1) FR2169148B1 (enrdf_load_stackoverflow)
GB (1) GB1387330A (enrdf_load_stackoverflow)
NO (1) NO132973C (enrdf_load_stackoverflow)
PL (1) PL79176B1 (enrdf_load_stackoverflow)
SE (1) SE400120B (enrdf_load_stackoverflow)
TR (1) TR17552A (enrdf_load_stackoverflow)
YU (1) YU34605B (enrdf_load_stackoverflow)
ZA (1) ZA73309B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528107A1 (fr) * 1982-06-04 1983-12-09 Mecseki Szenbanyak Procede et dispositif pour extraire des materiaux dans des espaces incontrolables de mines par tirage d'une charge importante, avec protection contre les explosions de grisou
WO2000060301A1 (en) * 1999-03-31 2000-10-12 Rocktek Ltd. Cartridge and charging system incorporating same
US20040007911A1 (en) * 2002-02-20 2004-01-15 Smith David Carnegie Apparatus and method for fracturing a hard material
US6708619B2 (en) 2000-02-29 2004-03-23 Rocktek Limited Cartridge shell and cartridge for blast holes and method of use
RU2307311C1 (ru) * 2006-02-07 2007-09-27 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Комбинированная засыпная забойка
RU2308674C1 (ru) * 2006-03-13 2007-10-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Забойка комбинированная
JP2010096419A (ja) * 2008-10-16 2010-04-30 Sb Kogyo Kk トンネル工事における発破粉塵の抑制方法
US20210270589A1 (en) * 2020-03-02 2021-09-02 River Front Services, Inc. Tamp for explosive material

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US229845A (en) * 1880-07-13 Method of blasting in oil-wells
US2216067A (en) * 1939-07-12 1940-09-24 Isaac N Clark Blasting bridge for oil wells
US2787933A (en) * 1954-05-24 1957-04-09 Ingvar D Wester Tamping stick
DE1446964A1 (de) * 1964-02-14 1968-12-05 Hubert Lichtenberg Besatzpatrone
DE1808554A1 (de) * 1967-09-09 1970-09-17 Morhenn Dipl Ing Ernst Verfahren und Besatzampulle zum Besetzen von Sprengladungen in Bohrloechern
US3752079A (en) * 1969-07-03 1973-08-14 Kalk Chemische Fabrik Gmbh Method for fighting dust and noxious gases after blasts in mines

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE511446C (de) * 1930-10-30 Hermann Kruskopf Hohlraumbesatz fuer Bohrloecher
FR1315051A (fr) * 1960-12-31 1963-01-18 Cartouche de bourrage pour la mise en place d'une matière plastique de bourrage dans les trous de mine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US229845A (en) * 1880-07-13 Method of blasting in oil-wells
US2216067A (en) * 1939-07-12 1940-09-24 Isaac N Clark Blasting bridge for oil wells
US2787933A (en) * 1954-05-24 1957-04-09 Ingvar D Wester Tamping stick
DE1446964A1 (de) * 1964-02-14 1968-12-05 Hubert Lichtenberg Besatzpatrone
DE1808554A1 (de) * 1967-09-09 1970-09-17 Morhenn Dipl Ing Ernst Verfahren und Besatzampulle zum Besetzen von Sprengladungen in Bohrloechern
US3752079A (en) * 1969-07-03 1973-08-14 Kalk Chemische Fabrik Gmbh Method for fighting dust and noxious gases after blasts in mines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528107A1 (fr) * 1982-06-04 1983-12-09 Mecseki Szenbanyak Procede et dispositif pour extraire des materiaux dans des espaces incontrolables de mines par tirage d'une charge importante, avec protection contre les explosions de grisou
WO2000060301A1 (en) * 1999-03-31 2000-10-12 Rocktek Ltd. Cartridge and charging system incorporating same
US6708619B2 (en) 2000-02-29 2004-03-23 Rocktek Limited Cartridge shell and cartridge for blast holes and method of use
US20040007911A1 (en) * 2002-02-20 2004-01-15 Smith David Carnegie Apparatus and method for fracturing a hard material
RU2307311C1 (ru) * 2006-02-07 2007-09-27 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Комбинированная засыпная забойка
RU2308674C1 (ru) * 2006-03-13 2007-10-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Забойка комбинированная
JP2010096419A (ja) * 2008-10-16 2010-04-30 Sb Kogyo Kk トンネル工事における発破粉塵の抑制方法
US20210270589A1 (en) * 2020-03-02 2021-09-02 River Front Services, Inc. Tamp for explosive material
US11808559B2 (en) * 2020-03-02 2023-11-07 River Front Services, Inc. Tamp for explosive material

Also Published As

Publication number Publication date
FI56275C (fi) 1979-12-10
FR2169148A1 (enrdf_load_stackoverflow) 1973-09-07
PL79176B1 (enrdf_load_stackoverflow) 1975-06-30
FI56275B (fi) 1979-08-31
DE2203488B1 (de) 1972-11-09
JPS5333650B2 (enrdf_load_stackoverflow) 1978-09-16
BE794363A (fr) 1973-05-16
ZA73309B (en) 1973-11-28
FR2169148B1 (enrdf_load_stackoverflow) 1977-09-02
SE400120B (sv) 1978-03-13
YU310872A (en) 1979-04-30
JPS4886701A (enrdf_load_stackoverflow) 1973-11-15
TR17552A (tr) 1975-07-23
CS164793B2 (en) 1975-11-28
NO132973B (enrdf_load_stackoverflow) 1975-11-03
DD103318A5 (enrdf_load_stackoverflow) 1974-01-12
GB1387330A (en) 1975-03-12
YU34605B (en) 1979-10-31
NO132973C (enrdf_load_stackoverflow) 1976-02-11
ES410387A1 (es) 1976-04-16

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