US3091177A - Method for loading a bore hole - Google Patents

Method for loading a bore hole Download PDF

Info

Publication number
US3091177A
US3091177A US49017A US4901760A US3091177A US 3091177 A US3091177 A US 3091177A US 49017 A US49017 A US 49017A US 4901760 A US4901760 A US 4901760A US 3091177 A US3091177 A US 3091177A
Authority
US
United States
Prior art keywords
bore hole
explosive
disc
hole
load
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
US49017A
Other languages
English (en)
Inventor
Carl E Grebe
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.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
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 to NL264205D priority Critical patent/NL264205A/xx
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Priority to US49017A priority patent/US3091177A/en
Priority to US48986A priority patent/US3112701A/en
Priority to BE596790A priority patent/BE596790A/fr
Priority to DED35824A priority patent/DE1188993B/de
Priority to GB13487/61A priority patent/GB973751A/en
Priority to FR859374A priority patent/FR1289726A/fr
Application granted granted Critical
Publication of US3091177A publication Critical patent/US3091177A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • 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
    • F42D1/18—Plugs for boreholes

Definitions

  • -It is a further object of the present invention to provide a means of increasing the effective rock breakage in a mine or quarry blast that can be realized from a given amount of an explosive material.
  • FIGURE 1 presents a sectional view of one embodiment ⁇ of a bore hole loaded with an explosive and containing a series of saucer-shaped circular discs spaced at intervals throughout the length of the load, each disc delining a center opening.
  • FIGURE 2 is a'view taken along line 2 2 of FIG- URE 1.
  • the members used will have one circular plane and preferably will define openings for passing explosive therethrough. Further, these members will have a maximum diameter about the same as that of the cylindrical explosive form. These members need not be hat circular discs but can be dish-like, a segment of an oblate spheroid, pyramidal, truncated conical, a hemisphere, a segment of ⁇ a prolate spheroid, t-runcat-ed pyramidal, a spherical segment and the like.
  • these members will be of such a thickness as to be nonstructurally conning of -an explosive blast.
  • the actual thickness to be utilized for the members will vary depending on the type of explosive with which they are utilized, the number of members used within a given bore hole and the type of material from which they are constructed. Generally they will range in thickness from that of commercially available metal foil (about 0.001 inch) up to about 1 inch or more.
  • the members can be made from a variety of nonstructural materials, eg., glass, ceramic, resin, rubber, wood, metal, etc. Preferably they will be made of -an electron conducting material such as iron, zinc, magnesium, aluminum, titanium, zirconium and alloys there- 3,@9Ll77 Patented May 28, 1963 of and desirably they will be prepared from magnesium, aluminum, magnesium alloys or aluminum alloys. It is understood these members can be prepared -by any of a number of suitable conventional means, that is deep drawing, shaping, stamping, molding and casting.
  • -an electron conducting material such as iron, zinc, magnesium, aluminum, titanium, zirconium and alloys there- 3,@9Ll77 Patented May 28, 1963 of and desirably they will be prepared from magnesium, aluminum, magnesium alloys or aluminum alloys. It is understood these members can be prepared -by any of a number of suitable conventional means, that is deep drawing, shaping, stamping, molding and casting.
  • the members will be positioned laterally lat intervals along the principal axis of a cylindrical explosive load as in a bore hole and will have the plane of their maximum diameter parallel to the cross-sectional plane, as dened by the base or top of said cylindrical explosive load, for example, and will be normal to the principal axis of this load, and will be separated from each other by the explosive material.
  • the members will have a diameter slightly smaller than the diameter of the load, which will not only permit easy placement of these in a bore hole but which also will lend for ease in maintaining these members in a lateral position within the explosive 'load and bore hole.
  • Members will be placed at spaced intervals ranging from about 4 inches to about 10 feet apart in a normal 20 to 40 foot deep explosive load within a bore hole. Preferably these will be spaced at a distance ranging from about l to about 6 feet apart.
  • magnesium or aluminum discs for example, when utilized with an ammonium nitrate based explosive in taconite effective results have been found with the members being placed at from about 1 to about 3 foot intervals throughout the explosive load in a 9 inch diameter bore hole.
  • the cir-cular members With a metallized explosive load such as a mixture utilizing coarse metal particles and a fluid form ⁇ of -ammonium nitrate, the cir-cular members can -be placed in a bore hole and be kept separated by the coarse metal particles used in the mix. The liquid explosive cornponent then can be poured over the metal in the hole.
  • a metallized explosive load such as a mixture utilizing coarse metal particles and a fluid form ⁇ of -ammonium nitrate
  • Example 1 A 51/2 pound explosive load, comprised of aluminum sheet foil cones (14 percent by weight of the total explosive load), coarse magnesium ichips (14 percent of the weight of the total load) and 72 percent by weight of an aqueous aimmoniacal ammonium nitrate lsolution (containing about 5 percent by weight water, about 25 percent by weight ammonia, balance ammonium nitrate) was prepared in the following manner.
  • a cylindrical canister ⁇ of about 6 inches in diameter and about 1 foot high was made f-rom aluminum foil.
  • An yaluminum cone having a base of substantially this same diameter and defining lau opening at its apex - was placed in the bottom of the canister, a layer of coarse magnesium chips was added, another cone was then placed over the chips, and this procedure was continued until the canister was filled.
  • the ammonium nitrate solution was then poured over the alternately layered aluminum cone-magnesium chip system and the so prepared load was placed in a 6 inch diameter, 6 feet deep bore hole drilled in sandstone.
  • a shaped charge initiator was placed on top of the load and the remaining 5 feet of the hole was stemmed with sand. After permitting the load to stand for about 35 minutes, it was fired.
  • a load of the same composition was prepared in a similar canister.
  • the metal used in this load was a 50-50 mixture by weight of coarse magnesium and coarse aluminum chips and no cones. This charge was loaded into a bore hole, armed and the hole stemmed ⁇ as described above. The explosion resulting upon detonation produced a crater ⁇ about 1l feet in diameter, but there was no evidence of any unusual humping of the ground surrounding this crater.
  • Example 2 A 51/2 pound explosive load containing 20 percent by weight aluminum (flat discs ⁇ of about 6 inch diameter), 20 percent by weight coarse magnesium chips and 60 percent by weight of the ammonium nitrate solution of composition as used in Example 1 was prepared in a 6 inch diameter by 1 foot long aluminum foil cylindrical canister. The aluminum discs were placed laterally throughout the length of the canister and were separated by alternate layers of the Imagnesium chips. The load was placed in a 6 inch diameter 6 feet deep bore hole, armed with a shaped charged placed on top of the load, the hole stemmed with about feet of sand and the explosive detonated. A crater about 111/2 feet in diameter and about 5 feet deep resulted, with evidence of some additional explosive Work being manifested beyond the periphery of the crater.
  • Example 3 A 51/2 pound explosive load consisting of 6 perforated, at magnesium alloy die cast discs (2() percent by weight of total mix), a mixture of coarse magnesium-aluminum machine chips percent by weight of total mix) and 60 percent of ammonium nitrate solution of composition as used in Example 1, was prepared in a polyethylene bag. Alternate layers of the discs (each of which was about 71/2 inches in diameter and about 0.12 inch thick) and the machine chips were built up in the bag. The solution was then poured over the resulting metal structure. The load was armed with a shaped charge and placed in an 8 inch diameter bore hole about 5 feet deep in sandstone. The hole was stemmed with sand red.
  • the resulting explosion produced a crater about 12 feet in diameter with a total area of humping of about 16 feet diameter. Additionally, this shot was found to be of high velocity.
  • Example 4 A comparative set of shots was run in a series of commerical bore holes drilled in taconite. One set of holes was loaded with metal (S0-50 magnesium and aluminum) comprising about 40 percent by weight of the total explosive load. These metal chips were used to form alternate layers with saucer-like perforated magnesium discs defining a center opening. The discs were placed at 3 feet intervals up through the bore hole. A liquid ammoniacal solution of ammonium nitrate, composition as described in Example 1, was poured over the metal in the hole, this solution comprising about 60 percent by weight of the explosive load and just covering the metal.
  • metal S0-50 magnesium and aluminum
  • Each of the holes was armed with a shaped charge placed :on top of the load and stemmed with drill cuttings.
  • thin iron hemispheres placed at about 6 feet intervals throughout the length of a load ⁇ of free iiowing dynamite in a bore hole of limestone can effectively directionalize and lateralize the explosive blast resulting therefrom.
  • Zinc truncated pyramidal members placed at about 10 feet intervals throughout the length of a load ⁇ or TNT in 'a bore hole can upgrade the explosive force resulting therefrom.
  • Perforated pie pan shaped titanium discs placed at about 1 foot intervals throughout a cylindrical load of prilled ammonium nitrate 6 percent fuel oil in 'a bore hole of a coal strip mine promotes the effectiveness of the explosive.
  • a method of loading a bore hole which comprises; placing a thin walled aluminum cone in said hole, said cone being nonstructurally confining of an explosive blast, said cone defining an opening at its apex, said cone having its open circular base substantially of the same size as said bore hole but being movable over the length of said bore hole and said cone having its apex pointing upward in said bore hole, adding a predetermined amount of a free-flowing explosive to said bore hole to ll said bore hole a distance of from about 1 foot to about 6 feet above said cone, placing a second said cone onto said explosive in said bore hole, said second cone also having its apex pointing upward in said bore hole, adding more of said explosive to said hole to fill said bore hole a distance of from about 1 foot to about 6 feet above said second cone, continuing the alternate additions of said cones and said explosive to said bore hole until said bore hole is filled to a predetermined height, placing an initiator onto the explosive load, and, stemming said bore hole.
  • a method of loading a bore hole which comprises; placing a perforated magnesium saucer-shaped disc in a bore hole, said disc being nonstructurally coniining of an explosive blast, the diameter of said disc being substantially the same as the diameter of said bore hole but permitting movement of said disc over the length of said bore hole, positioning said disc whereby the plane defined by the circumference of said disc is parallel to the cross-section of said bore hole and normal to the principal axis of said bore hole, adding a predetermined amount of a 50-50 mixture of coarse magnesium and aluminum chips to said bore hole to ll said bore hole a distance of from about 1 foot to about 3 feet above said disc, placing a second said magnesium saucer-shaped disc in said bore hole, adding a second predetermined amount of said 50-50 mixture of coarse magnesium and coarse aluminum chips to fill said bore hole a distance of from about 1 foot to about 3 feet above said second disc, continuing said alternate additions of said discs and said chips until said bore hole is loaded to a predetermined height, pouring a liuid ammoniacal
  • a method for loading a bore hole which comprises:
  • a method for loading a bore hole which comprises:

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)
  • Pressure Welding/Diffusion-Bonding (AREA)
US49017A 1960-08-11 1960-08-11 Method for loading a bore hole Expired - Lifetime US3091177A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL264205D NL264205A (de) 1960-08-11
US49017A US3091177A (en) 1960-08-11 1960-08-11 Method for loading a bore hole
US48986A US3112701A (en) 1960-08-11 1960-08-11 Disc for upgrading work of explosives
BE596790A BE596790A (fr) 1960-08-11 1960-11-04 Charge explosive perfectionnée et son de fabrication.
DED35824A DE1188993B (de) 1960-08-11 1961-04-10 Zylindrische Sprengladung zum Bohrlochschiessen
GB13487/61A GB973751A (en) 1960-08-11 1961-04-14 Explosive charge
FR859374A FR1289726A (fr) 1960-08-11 1961-04-20 Charge explosive perfectionnée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US49017A US3091177A (en) 1960-08-11 1960-08-11 Method for loading a bore hole

Publications (1)

Publication Number Publication Date
US3091177A true US3091177A (en) 1963-05-28

Family

ID=21957643

Family Applications (2)

Application Number Title Priority Date Filing Date
US48986A Expired - Lifetime US3112701A (en) 1960-08-11 1960-08-11 Disc for upgrading work of explosives
US49017A Expired - Lifetime US3091177A (en) 1960-08-11 1960-08-11 Method for loading a bore hole

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US48986A Expired - Lifetime US3112701A (en) 1960-08-11 1960-08-11 Disc for upgrading work of explosives

Country Status (6)

Country Link
US (2) US3112701A (de)
BE (1) BE596790A (de)
DE (1) DE1188993B (de)
FR (1) FR1289726A (de)
GB (1) GB973751A (de)
NL (1) NL264205A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3474729A (en) * 1968-02-21 1969-10-28 Gulf Oil Corp Ammonium nitrate explosive package and three-stage method of initiation
US4519314A (en) * 1980-07-29 1985-05-28 C-I-L Inc. Borehole charging method including toroidal transformer cores
US5431104A (en) * 1993-06-14 1995-07-11 Barker; James M. Exploding foil initiator using a thermally stable secondary explosive
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
US20080047455A1 (en) * 2004-01-26 2008-02-28 Edward Walenty Tota Rock Breaking Cartridge and Use Thereof
US20180363400A1 (en) * 2014-05-17 2018-12-20 Halliburton Energy Services, Inc. Establishing communication downhole between wellbores

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173368A (en) * 1962-07-18 1965-03-16 Trojan Powder Co Tamping plug for boreholes
US3377909A (en) * 1967-09-29 1968-04-16 Dow Chemical Co Explosive composition and method
GB1195461A (en) * 1968-01-01 1970-06-17 Ici Ltd Blasting Method and Devices therefor
US4342261A (en) * 1980-06-23 1982-08-03 The United States Of America As Represented By The Secretary Of The Army Shaped charge warhead with mechanical means for preventing rotation
US4510870A (en) * 1981-07-27 1985-04-16 The United States Of America As Represented By The Secretary Of The Army Charge liner construction and method
FR2581446B1 (fr) * 1985-05-02 1987-10-02 Nielli Philippe Procede d'explosif a pieces modulaires permettant la creation controlee de secousses et d'ondes de choc repetitives a travers les gaz, les airs, les liquides, les solides pour emplois militaires et civils
AT411430B (de) * 2002-06-19 2004-01-26 Andritz Ag Maschf Filter- oder sortierscheibe und verfahren zur herstellung
RU2649201C1 (ru) * 2017-02-13 2018-03-30 Алексей Николаевич Шустов Скважинное запирающее устройство
RU176154U1 (ru) * 2017-06-13 2018-01-10 Алексей Николаевич Шустов Скважинное запирающее устройство
CN112696999B (zh) * 2020-12-30 2022-11-25 山东科技大学 一种用于深孔爆破的装药装置及装药方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1767182A (en) * 1928-01-12 1930-06-24 Lisse Leopold Blasting cartridge with cover and process of production
US2168030A (en) * 1937-01-12 1939-08-01 Du Pont Explosive composition
US2586801A (en) * 1942-08-27 1952-02-26 Us Sec War Incendiary bomb
US2837996A (en) * 1954-05-04 1958-06-10 Seismograph Service Corp Explosive charge

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2026454A (en) * 1933-01-10 1935-12-31 Seidel & Naumann Ag Locking disk
US2247169A (en) * 1937-12-11 1941-06-24 Heitzman Safety Blasting Plug Blasting shell for surface blasting
US2245751A (en) * 1938-09-26 1941-06-17 Gen Motors Corp Fastening device
US2448648A (en) * 1944-09-08 1948-09-07 Clinton L Stockstill Solar water heater
DE851474C (de) * 1950-09-22 1952-10-06 Robert Dipl-Ing Meyer Sprengverfahren, insbesondere fuer bergbauliche Zwecke
DE919457C (de) * 1951-06-05 1954-10-21 Trentesaux Toulemonde Sa Sprengpatrone
US2760434A (en) * 1952-01-10 1956-08-28 Olin Mathieson Explosive
US2926604A (en) * 1952-06-30 1960-03-01 Norman A Macleod Explosion propagating device
US3016831A (en) * 1958-10-02 1962-01-16 Du Pont Surface wave generator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1767182A (en) * 1928-01-12 1930-06-24 Lisse Leopold Blasting cartridge with cover and process of production
US2168030A (en) * 1937-01-12 1939-08-01 Du Pont Explosive composition
US2586801A (en) * 1942-08-27 1952-02-26 Us Sec War Incendiary bomb
US2837996A (en) * 1954-05-04 1958-06-10 Seismograph Service Corp Explosive charge

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3474729A (en) * 1968-02-21 1969-10-28 Gulf Oil Corp Ammonium nitrate explosive package and three-stage method of initiation
US4519314A (en) * 1980-07-29 1985-05-28 C-I-L Inc. Borehole charging method including toroidal transformer cores
US5431104A (en) * 1993-06-14 1995-07-11 Barker; James M. Exploding foil initiator using a thermally stable secondary explosive
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
US20080047455A1 (en) * 2004-01-26 2008-02-28 Edward Walenty Tota Rock Breaking Cartridge and Use Thereof
US20180363400A1 (en) * 2014-05-17 2018-12-20 Halliburton Energy Services, Inc. Establishing communication downhole between wellbores
US10808482B2 (en) * 2014-05-17 2020-10-20 Halliburton Energy Services, Inc. Establishing communication downhole between wellbores

Also Published As

Publication number Publication date
DE1188993B (de) 1965-03-11
US3112701A (en) 1963-12-03
GB973751A (en) 1964-10-28
FR1289726A (fr) 1962-04-06
NL264205A (de)
BE596790A (fr) 1961-05-04

Similar Documents

Publication Publication Date Title
US3091177A (en) Method for loading a bore hole
CN105874299B (zh) 设置有气隙的炸药管及利用此炸药管的岩石爆破施工法
US3750582A (en) Projectile with differential tandem shaped charges
US3477372A (en) Directional charge explosive device
US3215074A (en) Apparatus for well drilling operations with explosives
Adhikari Studies on flyrock at limestone quarries
US4938143A (en) Booster shaped for high-efficiency detonating
US3037453A (en) Booster
US3037452A (en) Booster for relatively insensitive explosives
US2704515A (en) Method of loading for liquid oxygen explosives
KR102009967B1 (ko) 다중 다단 분산 장약기법을 이용한 장공 발파 공법
US3721192A (en) Shaped charge
US3090306A (en) Explosive
US3610150A (en) Blasting method
AU4133901A (en) Explosives with embedded bodies
US3462324A (en) Explosive composition comprising a salt component contiguous to an over-fueled salt component
US3377909A (en) Explosive composition and method
US2586541A (en) Detonating assembly
US5596165A (en) Blasting method and composition
Begalinov et al. Shock blasting of ore stockpiles by low-density explosive charges
US4002119A (en) Method for in situ assembly of charge for controlled shooting of wells
US2595960A (en) Explosive device
US4864933A (en) Method of rock breakage by blasting
CA1240554A (en) Borehole stemming with a column of liquefiable and/or vaporizable chunks of solid material
Qian Classification and safety precautions of blasting technology