US3040615A - Device for loading bore-holes with explosive - Google Patents

Device for loading bore-holes with explosive Download PDF

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Publication number
US3040615A
US3040615A US711417A US71141758A US3040615A US 3040615 A US3040615 A US 3040615A US 711417 A US711417 A US 711417A US 71141758 A US71141758 A US 71141758A US 3040615 A US3040615 A US 3040615A
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United States
Prior art keywords
pipe
cartridges
explosive
bore
loading
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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
US711417A
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English (en)
Inventor
Johansson Carl Hugo
Ljungberg Sten Herman
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.)
Nitroglycerin AB
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Nitroglycerin AB
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Filing date
Publication date
Application filed by Nitroglycerin AB filed Critical Nitroglycerin AB
Application granted granted Critical
Publication of US3040615A publication Critical patent/US3040615A/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
    • F42D1/10—Feeding explosives in granular or slurry form; Feeding explosives by pneumatic or hydraulic pressure

Definitions

  • This invention relates to a device for loading boreholes with explosive.
  • More particularly invention relates to a device for loading bore-holes with cartridges of an explosive constituted by a plastic mass or a powder.
  • this invention relates to a device for loading bore-holes with explosive of the kind described in the co-pending US. Patent 2,824,483 issued to Carl Hugo Johansson and substantially comprising a pipe insertable into the bore-hole and connectable to a source of a pressure medium upon introducing of the cartridges into the pipe.
  • the cartridges are advanced by the pressure medium, preferably compressed'air, Within the pipe and discharged through the remote end of the pipe.
  • the pipe has for the greater part of its length an internal diametergreater than that of the cartridges but a reduced diameter at its remote end portion, said portion having an internal diameter corresponding to the thick- Ar-ranged on the inner face of said end portion with reduced diameter are knives or cutters which when the cartridges pass through said .end portion cut the wrapping enclosing the explosive, and made of paper or the like material.
  • the final placing of the explosive in the bore-hole so as to fill said hole in spite of its diameter exceeding that of the cartridges is effected so that the cartridges after their passage past the end edge of thepipe with their wrapping cut up are packed or compressed by the pipe which is pressed backwards at even intervals While being stepwise drawn back in the bore-hole.
  • Said loading device has come into widespread use and proved to afiord considerably improved filling of the boreholes resulting in an improved utilization of the bored hole volume.
  • Said loading device has come into widespread use and proved to afiord considerably improved filling of the boreholes resulting in an improved utilization of the bored hole volume.
  • One main object of our invention is to provide a loading device of the kind described above which satisfies specifically high demands regarding safety against unintentional initiation of the explosive. For example, it must not under any circumstances occur that the explosive due to reciprocal movement of the pipe during the loading operation is subjected to such friction on the hard wall of the borehole as at any place to produce a temperature exceeding the temperature required to set oif the charge. As is well known, the friction between two faces such as a metal face and a rock face is apt to cause an extreme heating of concentrated portions. In normal cases said heating does not harm since the developed heat is quickly conducted away from said portions. During the loading procedure compressed air escapes into the space between the wall of the bore and the pipe and it cannot be avoided that minor particles of explosive are carried along with the escaping air.
  • the pipe is made at least for a portion of its length of a non-metallic material.
  • Said non-metallic material have a mechanical strength sufiicient for use under all climate conditions met anywhere and a low coefiicient of friction on the rock surface, said friction under no conditions being capable of causing a concentration of heat of a magnitude entailing any risk of unintentional initiation of the explosive though highly sensitive to initiation.
  • the pipe is preferably made flexible so as to make possible-to form it as a coherent unit.
  • the portion of the pipe projecting over the surface of ground may be deposited in the form of a coil or loop which nevertheless normally does not cause any difficulties in the advance of the cartridges.
  • Another feature of the invention consists in the pipe on its internal face being provided with longitudinal grooves in order to avoid an excessive air pressure to be built up on one side of cartridges caught and stopped within the pipe.
  • the longitudinal grooves on the internal face of the pipe are of great importance for attaining complete security in the use of our loading device. Without such grooves cartridges stopped on their way to the outlet end of the pipe have proved to cause so powerful an increase of pressure behind them to be built up that they later when released are accelerated to a very high velocity embodying the danger of an ex- Pa tented June 26, 1962;
  • FIG. 1 is a sectional view of a substantial vertical bore-hole which is being loaded by means of the device constructed according to the invention.
  • FIG. 2 is a view on a larger scale of the end inserted into the bore-hole shown in FIG. 1 of a pipe forming part of the device shown in said FIG. 1 and represented as a section along line II-II of FIG. 3 which in turn is a cross-section along line III-III of FIG. 2.
  • FIG. 4 is a sectional view bellowing line IV--IV of FIG. 2.
  • FIG. 5 is a sectional view of a locking device and a cartridge magazine connected to the upper end of the pipe.
  • FIG. 6 is a sectional view following line VI-VI of FIG. 5.
  • reference numeral 10 designates a vertical bore-hole provided in the bed-rock. Said hole is to be filled with explosive by means of the loading device constructed according to the invention.
  • the device comprises a flexible pipe or hose 12 made of synthetic plastic material and having a length exceeding the depth of the bore-hole.
  • the end of the pipe 12 directed toward the base of the bore-hole has a portion 14 having a reduced internal diameter corresponding to the external diameter of the cylindrical explosive cartridges and thus being less than the internal diameter of the other portions of the pipe.
  • the portion 14 may be manufactured by compressing the end portion of the pipe while heated and thereupon placing a sleeve 16 also made of a synthetic plastic material and welding it onto the compressed end portion 14.
  • the sleeve 16 is given the same or a slightly smaller external diameter than that of the pipe 1?. in general.
  • a plurality-of knives or cutters 18, (see FIG. 3) preferably three in number, are evenly distributed around the circumference of the compressed portion 14 with their edges extending radially inwardly from the internal wall of said portion 14.
  • the knives have peripherally curved base portions 20 secured by welding between the portion of the tube and the sleeve 16.
  • the internal face of the pipe 12 is provided with longitudinal grooves 22 extending over the Whole length of the pipe with the preferred exception of the outlet portion 14.
  • the grooves may have a part-circular cross-- section and are preferably evenly distributed over the whole internal wall of the pipe.
  • the pipe 12 is made of a synthetic plastic material which should have such composition as to be capable of sustaining the low temperatures which may be met during winter at the places of use without losing its mechanical strength.
  • the synthetic plastic material should further be capable of being joined by welding.
  • Pipes made of polyethylene comply with these demands in a highly satisfactory manner.
  • a synthetic plastic material treated to become antistatic in a manner known per se in prior art it is further preferred to use in the device a synthetic plastic material treated to become antistatic in a manner known per se in prior art.
  • the end portion of the pipe 12 projecting out of th bore-hole carries a coupling 24- provided with a connect ing socket 26 for a hose 28 communicating with a source of compressed air and attached to said locking device at a right angle to the longitudinal'axis thereof.
  • Attached to said locking device is also a tube 30 disposed coaxially with thelongitudinal axis of said device.
  • a magazine '32 having the form of a topopen container adapted to receive a plurality of substantially parallelly placed explosive cartridges 34 and having a cross-sectional contour tapering towards its base to the size of the diameter of the tube 30.
  • Said crosssectional contour of the container is preferably unsymmetrical, one-of its sloping walls, for example the wall denoted 36 being slightly longer than the opposite sloping wall 38 in order to prevent cartridges from becoming jammed so as not automatically to fall down into the tube 3'9.
  • the tube 30 encloses a plunger 40 provided with a handle 42 displaceable along a longitudinal aperture 44 formed on the top face of the tube.
  • the cartridges fed from above into the tube 30 are successively advanced by the plunger 40 into the locking device 24 and therefrom into the pipe 12.
  • the locking device has a flap 46 adapted to be pushed into open position by the cartridges through being pivoted upwardly around a journal 48.
  • the flap 46 is located adjacent the rear portion of the tube 30 entering the locking device.
  • the front portion of said device may taper towards the pipe 12.
  • the pipe 12 of the loading device is inserted deeply into the bore-hole 10 so as to reach adjacent the base thereof.
  • a charge comprising a greater plurality of cartridges of explosive which have the form of cylindrical bars with the explosive enclosed in a map ping of paper or similar material is introduced into the magazine 32 so as to cause cartridges to be positioned 1n the magazine with their longitudinal axis substantially in parallel.
  • the cartridges are one after the other advanced by the plunger 41 past the flap 46.
  • compressed air is introduced through the hose 28. The compressed air acts omthe flap 46 soas to cause said flap automatically to seal the communication with the tube 30.
  • the cartridges are carried by the pressure fluid downwardly to the lower end of the pipe 12 and discharged through rhe portion 14 with the reduced diameter, the knives cutting the wrapping of paper or similar material of the cartridges into pieces.
  • the pipe 12 when step-wise or successively being carried upwardly is at equal interval pressed backwards against the mass of discharged explosive so as to cause said mass completely to fill the entire section of the bore-hole as will be seen from FIG. 1.
  • the portions of the pipe drawn upwardly out of the hole may be deposited on the surface of ground in coils, loops or windings. If it should happen that at any place the radius of curvature becomes to small to allow the passage of the cartridges the grooves 22 will continuously permit the compressed air to flow through the pipe so so much as to prevent a too high pressure from. being produced behind the cartridges.
  • the cartridges are released for example by Widening the curvature of the 0011 or winding said cartridges cann'otbe accelerated but to a speed far below the dangerous value of initiation of the explosive,
  • the portion of the pipe located adjacent the locking device 24 may be given a slightly larger external or internal diameter than that of the other portions of the pipe. Due to technical reasons in the boring of holes in bed-rocket the holes in particular when they are long or deep have a diameter successively reduced in the direction from the surface of ground.
  • a tube made of metal preferably brass, may be used because such tube may be made with thinner walls and consequently a minor external diameter than a pipe of synthetic plastic material.
  • the pipe of metal is tightly attached to'the pipe of synthetic plastic material and is provided with a discharge mouth of reduced internal diameter and fitted with cutters of the type described above.
  • the discharge end of the pipe 12 may be provided 'with a mouth made of elastic material so as to be adapted to be adjusted in response to variations of the diameter of the cartridges.
  • the pipe may be composed of tubular members having a I carrier constituted by paper, board or similar material impregnated with a synthetic resin of suitable composition.
  • a device for introducing units of explosive into bore holes comprising a flexible tube of a character to avoid creation and concentration of electrical energy suificient to cause an explosion, said tube having a series of longitudinal grooves on the interior face of the tube for preventing the build up of excessive fluid pressure on one side of said explosive units and having an internally reduced discharge end, inwardly extending knives within such reduced portion adapted to engage the exterior of the units of explosive, a supply chamber for a collection of explosive units, said chamber having a discharge in communication with said flexible tube, a plunger for removing said units singly from said chamber into said flexible tube, a closure for said discharge, and a connection for a fluid under pressure between said closure and said tube whereby said explosive units may he introduced one at a time into said tube and forced by fluid under pressure through said tube into a bore hole.
  • a device for loading bore holes with explosive cartridges comprising a flexible plastic anti-static pipe of an external diameter less than that of the bore hole, and having an internal diameter exceeding the external diameter of the cartridges, said pipe having its internal face provided with a multiplicity of longitudinal grooves, each groove being of less circumferential extent than the circumferential extent of the adjacent lands to avoid creation of an excessive air pressure on one side of cartridges disposed within the pipe by by-passing air through said grooves, said pipe having a charging end and a discharging end, and means .for applying air under pressure to the charging end to discharge cartridges in the pipe through the discharge end thereof.

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  • 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)
  • Air Transport Of Granular Materials (AREA)
US711417A 1957-04-25 1958-01-27 Device for loading bore-holes with explosive Expired - Lifetime US3040615A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE398157 1957-04-25

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US3040615A true US3040615A (en) 1962-06-26

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US (1) US3040615A (en, 2012)
BE (1) BE564336A (en, 2012)
CH (1) CH369995A (en, 2012)
DE (1) DE1087060B (en, 2012)
FR (1) FR1198584A (en, 2012)
GB (1) GB878799A (en, 2012)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125925A (en) * 1960-03-22 1964-03-24 X xartridges
US3303738A (en) * 1963-10-14 1967-02-14 Intermountain Res And Engineer Method for mixing and pumping of slurry explosive
US3810425A (en) * 1972-12-04 1974-05-14 J Post Method of blasting with an nh{11 {11 no{11 -{11 nitropropane blasting agent
US3867867A (en) * 1972-05-31 1975-02-25 Ici Ltd Cavities with fluent material
US3986430A (en) * 1975-03-21 1976-10-19 E. I. Du Pont De Nemours And Company Loading of boreholes with explosives
US4699060A (en) * 1985-06-26 1987-10-13 Charbonnages De France Detonation arrestor device for bulk explosive materials transfer
US5192819A (en) * 1991-06-11 1993-03-09 Baumgartner Otto F Bulk explosive charger
US5862758A (en) * 1993-01-15 1999-01-26 Schlumberger Technology Corporation Insert and twist method and apparatus for securing a shaped charge to a loading tube of a perforating gun
US6564686B1 (en) * 2000-03-28 2003-05-20 Utec Corporation, L.L.C. Continuous explosive charge assembly and method for loading same in an elongated cavity
US20070062406A1 (en) * 2005-09-19 2007-03-22 Waldock Kevin H Mobile Platform for the Delivery of Bulk Explosive
US7258054B1 (en) 2000-03-28 2007-08-21 Utec Corporation, Llc Continuous explosive charge assembly for use in an elongated cavity
EP1916381A1 (fr) * 2006-10-19 2008-04-30 Sandvik Mining and Construction Lyon SAS Dispositif expéditeur de cartouches de résine pour appareil de boulonnage
CN101871753A (zh) * 2010-06-28 2010-10-27 黄义干 液压静态爆破液压管

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL272235A (en, 2012) * 1960-12-09
DE1240766B (de) * 1965-07-31 1967-05-18 Continental Gummi Werke Ag Sprengstoff-Ladeschlauch, insbesondere fuer den Bergbau
DE102011009037A1 (de) * 2011-01-20 2012-07-26 Rehau Ag + Co Transport von pulver- oder granulatförmigem Sprengstoff

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US70504A (en) * 1867-11-05 ely beach
US690675A (en) * 1901-05-09 1902-01-07 Taisey Pneumatic Service Company Despatch-tube.
US1029630A (en) * 1911-09-22 1912-06-18 William H Plummer Method of and apparatus for charging powder.
US1946780A (en) * 1932-07-16 1934-02-13 Joseph C Costello Powder loading device
US2415422A (en) * 1943-01-28 1947-02-11 Du Pont Blasting explosive assembly
US2720166A (en) * 1954-05-18 1955-10-11 Lampe Heinrich Apparatus for charging blasting bore holes for rock blasting with explosive in cartridge-from by means of compressed air
US2787933A (en) * 1954-05-24 1957-04-09 Ingvar D Wester Tamping stick
US2824483A (en) * 1950-03-13 1958-02-25 Nitroglycerin Ab Device for packing explosive cartridges into bore-holes
US2861828A (en) * 1953-07-27 1958-11-25 Robert E Mcmackin Shot hole pole and coupling

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE947127C (de) * 1952-04-19 1956-08-09 Muendener Gummiwarenfabrik Geb Insbesondere fuer Tankstellen bestimmter, elektrisch leitfaehiger Schlauch

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US70504A (en) * 1867-11-05 ely beach
US690675A (en) * 1901-05-09 1902-01-07 Taisey Pneumatic Service Company Despatch-tube.
US1029630A (en) * 1911-09-22 1912-06-18 William H Plummer Method of and apparatus for charging powder.
US1946780A (en) * 1932-07-16 1934-02-13 Joseph C Costello Powder loading device
US2415422A (en) * 1943-01-28 1947-02-11 Du Pont Blasting explosive assembly
US2824483A (en) * 1950-03-13 1958-02-25 Nitroglycerin Ab Device for packing explosive cartridges into bore-holes
US2861828A (en) * 1953-07-27 1958-11-25 Robert E Mcmackin Shot hole pole and coupling
US2720166A (en) * 1954-05-18 1955-10-11 Lampe Heinrich Apparatus for charging blasting bore holes for rock blasting with explosive in cartridge-from by means of compressed air
US2787933A (en) * 1954-05-24 1957-04-09 Ingvar D Wester Tamping stick

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125925A (en) * 1960-03-22 1964-03-24 X xartridges
US3303738A (en) * 1963-10-14 1967-02-14 Intermountain Res And Engineer Method for mixing and pumping of slurry explosive
US3867867A (en) * 1972-05-31 1975-02-25 Ici Ltd Cavities with fluent material
US3810425A (en) * 1972-12-04 1974-05-14 J Post Method of blasting with an nh{11 {11 no{11 -{11 nitropropane blasting agent
US3986430A (en) * 1975-03-21 1976-10-19 E. I. Du Pont De Nemours And Company Loading of boreholes with explosives
US4699060A (en) * 1985-06-26 1987-10-13 Charbonnages De France Detonation arrestor device for bulk explosive materials transfer
US5192819A (en) * 1991-06-11 1993-03-09 Baumgartner Otto F Bulk explosive charger
US5862758A (en) * 1993-01-15 1999-01-26 Schlumberger Technology Corporation Insert and twist method and apparatus for securing a shaped charge to a loading tube of a perforating gun
US5952603A (en) * 1993-01-15 1999-09-14 Schlumberger Technology Corporation Insert and twist method and apparatus for securing a shaped charge to a loading tube of a perforating gun
US6722251B2 (en) 2000-03-28 2004-04-20 Utec Corporation, L.L.C. Method for loading a continuous explosive charge assembly in an elongated cavity
US6564686B1 (en) * 2000-03-28 2003-05-20 Utec Corporation, L.L.C. Continuous explosive charge assembly and method for loading same in an elongated cavity
US7258054B1 (en) 2000-03-28 2007-08-21 Utec Corporation, Llc Continuous explosive charge assembly for use in an elongated cavity
US20070062406A1 (en) * 2005-09-19 2007-03-22 Waldock Kevin H Mobile Platform for the Delivery of Bulk Explosive
US7971534B2 (en) * 2005-09-19 2011-07-05 Waldock Kevin H Mobile platform for the delivery of bulk explosive
US8950330B2 (en) 2005-09-19 2015-02-10 Kevin H. Waldock Mobile platform for the delivery of bulk explosive
US20150168117A1 (en) * 2005-09-19 2015-06-18 Kevin H. Waldock Mobile Platform for the Delivery of Bulk Explosive
US9267777B2 (en) * 2005-09-19 2016-02-23 Lde Corporation Mobile platform for the delivery of bulk explosive
US10184770B2 (en) 2005-09-19 2019-01-22 Lde Corporation Mobile platform for the delivery of bulk explosive
EP1916381A1 (fr) * 2006-10-19 2008-04-30 Sandvik Mining and Construction Lyon SAS Dispositif expéditeur de cartouches de résine pour appareil de boulonnage
US20080145152A1 (en) * 2006-10-19 2008-06-19 Sandvik Mining And Construction Lyon Sas Device for dispatching resin cartridges for a bolting device
CN101871753A (zh) * 2010-06-28 2010-10-27 黄义干 液压静态爆破液压管

Also Published As

Publication number Publication date
DE1087060B (de) 1960-08-11
FR1198584A (fr) 1959-12-08
GB878799A (en) 1961-10-04
BE564336A (en, 2012) 1958-02-15
CH369995A (de) 1963-06-15

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