GB640988A - Improvements in or relating to blasting methods - Google Patents

Improvements in or relating to blasting methods

Info

Publication number
GB640988A
GB640988A GB5687/47A GB568747A GB640988A GB 640988 A GB640988 A GB 640988A GB 5687/47 A GB5687/47 A GB 5687/47A GB 568747 A GB568747 A GB 568747A GB 640988 A GB640988 A GB 640988A
Authority
GB
United Kingdom
Prior art keywords
row
holes
firing
face
blasting
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
Application number
GB5687/47A
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.)
Atlas Powder Co
Original Assignee
Atlas Powder 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
Application filed by Atlas Powder Co filed Critical Atlas Powder Co
Publication of GB640988A publication Critical patent/GB640988A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

640,988. Blasting ; blasting caps. ATLAS POWDER CO. Feb. 27, 1947, No. 5687. Convention date, May 16, 1946. [Classes 9 (i) and 68 (i)] In multiple bore hole blasting wherein a row of at least three generally aligned charged holes is detonated to break away a face and form a new face therebehind, the charges in at least three successively adjacent bore holes in the row are initiated at times separated by from 2 to 150 (preferably 20 to 75) milliseconds and preferably within approximately 300 milliseconds of the time of actuation of the detonation initiator in the first firing of these adjacent holes. There may be more than one row of holes, and each row may be generally parallel to the face to be broken away, with or without a row of holes at right-angles to such face. The firing-time separation may be obtained by the use of electric blasting caps having different firing times or connected to different circuits which are energized at separate times, or by particular arrangements of detonating fuses. The Specification contains examples of suitable caps and firing arrangements. The Figure shows a bore hole 20 loaded with a main explosive charge 22 and upper explosive charges 26, 30 separated by gravel stemmings 24, 28, 32. The main charge 22 is initiated by two similar electric blasting caps 34, 36, whilst the upper charges 26, 30 are initiated from the main charge 22 by detonating fuse 50. Specification 640,514 is referred to.
GB5687/47A 1946-05-16 1946-05-16 Improvements in or relating to blasting methods Expired GB640988A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US670193A US2609750A (en) 1946-05-16 1946-05-16 Process of blasting

Publications (1)

Publication Number Publication Date
GB640988A true GB640988A (en) 1950-08-02

Family

ID=24689387

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5687/47A Expired GB640988A (en) 1946-05-16 1946-05-16 Improvements in or relating to blasting methods

Country Status (2)

Country Link
US (1) US2609750A (en)
GB (1) GB640988A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1278908B (en) * 1963-07-18 1968-09-26 Rheinische Kalksteinwerke Process for the damming of boreholes, which significantly supports the explosive effect

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2671399A (en) * 1951-07-04 1954-03-09 Ici Ltd Blasting method
US2725821A (en) * 1952-03-29 1955-12-06 Hercules Powder Co Ltd Circuit closing means and blasting assembly
US2814991A (en) * 1952-05-21 1957-12-03 Ici Ltd Art of delay electric shot-firing of blasting explosive charges and appliances suitable for use in delay electric shot-firing circuits
US2788461A (en) * 1952-11-28 1957-04-09 Ici Ltd Method of firing explosive charges and apparatus therefor
US2775940A (en) * 1953-10-07 1957-01-01 Jr Robert L Klotz Method for blasting
US2930276A (en) * 1955-07-27 1960-03-29 Union Carbide Corp Charging blast holes with explosive
US2966855A (en) * 1958-03-20 1961-01-03 Airmite Midwest Inc Explosive-containing bag used in blasting
US3032866A (en) * 1961-01-18 1962-05-08 Hamilton Glass Company Window assembly machine
US3274933A (en) * 1963-05-24 1966-09-27 Exxon Production Research Co Apparatus for explosive charge drilling
US3457859A (en) * 1967-11-24 1969-07-29 Hercules Inc Method and system for initiating explosive composition
US3714895A (en) * 1970-01-13 1973-02-06 Gulf Oil Corp Method for excavating by explosions
FR2077846A1 (en) * 1970-02-18 1971-11-05 Dassault Aeronautique
US3687075A (en) * 1970-12-11 1972-08-29 Hercules Inc Modified presplitting technique
US4266826A (en) * 1974-09-12 1981-05-12 Occidental Oil Shale, Inc. In-situ recovery of constituents from fragmented ore
US4146272A (en) * 1977-09-14 1979-03-27 Occidental Oil Shale, Inc. Explosive placement for explosive expansion toward spaced apart voids
GB8804635D0 (en) * 1988-02-27 1988-03-30 St Andrews Drilling Ltd Method of fragmentation blasting
CA2381772C (en) * 1999-07-22 2006-05-02 Schlumberger Technology Corporation Components and methods for use with explosives
WO2002097360A1 (en) * 2001-05-31 2002-12-05 Hodgkinson, Barry, Anthony A cartridge
CN112361906A (en) * 2020-09-28 2021-02-12 甘肃酒钢集团宏兴钢铁股份有限公司 Medium-length hole V-shaped detonation method suitable for underground sill-pillar-free sublevel caving method
CN113188385A (en) * 2021-04-30 2021-07-30 雅化集团绵阳实业有限公司 Tunnel blasting composite cut method
CN113739654A (en) * 2021-09-04 2021-12-03 北京伊拜科技有限责任公司 Data acquisition and detection method for industrial detonator in blasting operation field

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US821883A (en) * 1906-01-05 1906-05-29 Du Pont Powder Co Fuse.
US1570733A (en) * 1922-07-12 1926-01-26 Eschbach Wilhelm Electric time fuse for blasting cartridges
US2239123A (en) * 1939-03-01 1941-04-22 Ensign Bickford Co Blasting with safety fuse
US2475875A (en) * 1943-08-07 1949-07-12 Du Pont Explosive assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1278908B (en) * 1963-07-18 1968-09-26 Rheinische Kalksteinwerke Process for the damming of boreholes, which significantly supports the explosive effect

Also Published As

Publication number Publication date
US2609750A (en) 1952-09-09

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