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US3159102A - Explosive demolition arrangement - Google Patents

Explosive demolition arrangement Download PDF

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Publication number
US3159102A
US3159102A US167550A US16755062A US3159102A US 3159102 A US3159102 A US 3159102A US 167550 A US167550 A US 167550A US 16755062 A US16755062 A US 16755062A US 3159102 A US3159102 A US 3159102A
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United States
Prior art keywords
explosive
front face
charge
guide sleeve
sleeve
Prior art date
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Expired - Lifetime
Application number
US167550A
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English (en)
Inventor
Riedl Hans-Joachim
Schluter Heinz
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.)
Wasag Chemie AG
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Wasag Chemie AG
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Filing date
Publication date
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/22—Elements for controlling or guiding the detonation wave, e.g. tubes

Definitions

  • the present invention is concerned with an explosive demolition arrangement and method and, more particu larly, the present invention is concerned with directing and increasing the effect of explosive demolition devices.
  • the demolition of piercing effect achieved by detonating an explosive charge is increased by arranging a thin-walled hollow body or sleeve in front of the explosive charge, i.e. interposed between the front face of the explosive charge and the target or object to be demolished.
  • the interposed sleeve is so arranged as to Converge in the direction from the charge towards the object to be detonated.
  • the hollow body of sleeve may also be composed of several layers.
  • the increase of the blasting ffbct of the hollow body is to a large degree dependent on the angle of inclination of the wall of the hollow body, i.e. on the apex angle or on the angle between the axis the generatrix of the hollow, preferably frusto-conical body which is used as an interposed sleeve between the charge and the object to be demolished.
  • the present invention contemplates a demolition arrangement, comprising, in combination, an object to be subjected to explosive force, an explosive device including an explosive charge of which the front face is spaced from and directed toward the surface of the object, and a guide sleeve interposed at least between the explosive device and the object, the guide sleeve substantially surrounding the front face of the explosive charge and converging in the direction towards the object so as to limit the lateral ex-' pension of the exploding charge and concentrate the same toward the surface of the object.
  • the effect of an explosive charge is concentrated within a limited cross-sectional area by arranging an explosive charge adjacent and in close proximity to an object to be subjected to explosive force in such a manner that the path of the explosive force generated upon detonating the charge will intersect a surface portion of the object, interposing between the explosive charge and the object a guide sleeve extending at a point spaced from the charge into the peripheral portion of the path of the explosive force, and detonating the explosive charge whereby the path of the explosive force will be narrowed so as to concentrate the effect thereof within a cross-sectional area which is smaller than the cross-sectional area of the path in the immediate vicinity of the explosive charge.
  • the conical hollow body and the jacket of the explosive can be either worked inone piece, or the hollow body may be fitted to the edge of the jacketi n any desired manner, e.g. fastening by means of an adhesive tape would already do.
  • the forwardly converging sleeve may be of frusto-conical shape, or of conical shape, i.e. closed at its forward end;
  • the shape of the tapered end may be flat, concave or convex. Similar to practises used in connection with shaped charges, theblasting effect may still be increased by fixing to the front face of the explosive charge a lining of easily deformable mel't'able or evaporable metal.
  • the generatrix of the sleeve forms with the axis of the same an angle of between 5 and 14.
  • the apex angle of the converging sleeve is preferably between 10 and 28.
  • the, sleeve is illustrated and described herein mainly as being of conical or frusto-conical shape, this is not to be considered an absolute limitation.
  • the generatrix of the sleeve may also be of parabolic or bottle neck-shaped curved configuration, but it is preferred that the overall inclination will be within the above-desclibed'range.
  • the sleeve at its narrower and poi" tion with an opening having a diameter equal to up to 25, preferably between 0% and 15% of the diameter of the hat front face of the explosive charge.
  • These preferred dimensions include a conical sleeve which terminates in a pointed end portion without an opening therein.
  • the sleeve may be made of any desired material such as metal, wood, synthetic materials, mill-board and the like, whereby, sleeves of lead have been found to give particularly good results.
  • the wall thickness of the sleeve will depend on the strength and. the specific gravity of the material of which the sleeve'is formed. Inv other words, the higher the strength and the specific gravity of the sleeve forming'material, the smaller may be the wall thickness of thesleeve.
  • FIG. 1 is a schematic elevational view of a demolition arrangement according to the present invention wherein the sleeve is of frusto-conical shape;
  • FIG. 2 is a schematic elevational cross-sectional view of another demolition arrangement according to the present invention wherein the sleeve forms a conical cavity.
  • the explosive charge is indicated by reference numeral 1
  • the jacket covering the explosive charge with the exception of its front face 2 is indicated by reference numeral 6, and a liner 16 may be fitted to front face 2.
  • Reference numeral 5 indicates the detonator.
  • the charge may be of any conventional shape and may be produced of conventional explosive compositions. The experiments which will be described further below were carried out with a charge having a funnel-shaped configuration.
  • the front face 2 of the charge 1 which front face is not covered in this case by a liner is of planar configuration.
  • Guide sleeve 3 is arranged surrounding front face 2 of charge l and converging towards target 4.
  • the experiments described below were carried out with charges having a circular planar face 2 with a diameter of 45 or 50 mm.
  • Example 1 Substantially as illustrated, an explosive composition, consisting of trinitrotoluene-RDX 40:60 was cast into a metal container. The weight of charge amounted to 75 g. The diameter of the explosive body was 50 mm. at
  • the conical sleeve was fixed with adhesive tape.
  • the charge thus prepared for blasting was arranged in front of the iron plate to be perforated at a distance of 15 mm.
  • An iron plate of 8 mm. thickness was used for this example. After the explosion, the plate showed a punched hole of 40 mm. inner diameter, whereas a comparative blasting without the conical sleeve only resulted in a bulge-like deformation of the plate.
  • Example 2 An explosive charge equal to that used for Example 2 was prepared. An iron sleeve homogeneously leaded, was used. The conical sleeve, covered with a lead lining, was fixed with an adhesive tape and placed onto the plate to be perforated. After the explosion, the plate showed a similar crater-like hollow, as described above, the hollow being larger than that obtained with ordinary iron sleeves.
  • Example 4 An explosive composition of 48 g., consisting of trinitrotoluene-RDX 50:50, was cast into a metal container.
  • the diameter of the explosive charge was 45 mm. at its greatest width.
  • each of the tables indicates the test number within the series of tests summarized in the respective table, columns 2, 3 and 4 respectively give the values for the angle alpha between generatrix and axis of the sleeve, the height h of the guide sleeve and the diameter d of the opening in the forward end of the guide sleeve which contacts steel plate 4.
  • Column 5 indicates in millimeters the depth of the indentation in the steel plate which was formed by detonating the charge under the conditions indicated in the respective tests.
  • Table I summarizes tests which were made with a guide sleeve formed of a steel sheet of 1 mm. thickness and having at its apex an opening of 4.8 mm. diameter.
  • the variables in this series are the angle between the axis and the generatrix of the frusto-conical sleeve and correspondingly the height h of the sleeve.
  • Tables II and III show the results which were achieved with steel sleeves having a wall thickness of 5 and 10 mm. respectively. It will be seen that optimum results. again are obtained in test 9, i.e. at an angle of 6.8".
  • Table V illustrates how the diameter d will influence the results obtained under otherwise equal conditions.
  • the angle between the axis and the generatrix of the sleeve varies corresponding to the change in the diameter of opening d while the height of the sleeve remains unchanged. It can be seen that the smaller opening d gives a far superior result.
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially fiat front face spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said front face of said explosive charge and having an axis substantially perpendicular to said flat front face of said explosive charge, said guide sleeve converging in the direction towards said object at an angle of between about 6 and 11 between said axis and the generatrix of said guide sleeve so as to limit the lateral expansion of the exploding charge and concentrate the same toward the surface of said object.
  • a stationary demolition arrangement comprising, in combination, an object to be subjected. to explosive force; an explosive device including an explosive charge having a substantially flat free front face spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a guide sleeve contact,- ing, and interposed between, said explosive device and said object, said guide sleeve substantially surrounding said front face of said explosive charge and having an axis substantially perpendicular to said fiat front face of said explosive charge, said guide sleeve converging in the direction towards said object at an angle of between about 6 and 11 between said axisjand the generatrix of said guide sleeve so as to limit the lateral expansion of the exploding charge and concentrate the same toward the surface of said object.
  • a stationary demolition arrangement comprising, in combination,- an object to be subjected to explosive force; an explosive device including an explosive charge having asubstantially flat free front face which latter is spaced from and directed toward the surface of said ob.- ject so that upon detonation the exploding charge will emanate from said front face toward said object; and a substantially frusto-conical guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said frontface of said explosive charge and having an axis substantially perpendicular to said flat front face of said explosive charge, said guide sleeve converging in the direction towards said object at an angle of between about 6 and 11 between said axis and the generatrix of said guide sleeve so as to limit the lateral expansion of the exploding charge and concentrate the same toward the surface of said object.
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially flat front face which is fitted with a liner and spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a substantially frusto-conical guide sleeve interiposed at least between said explosive device and said object, said guide sleeve substantially surrounding said front face of said explosive charge and having an axis substantially perpendicular to said flat front face of said explosive charge, said guide sleeve converging in the direction towards said object at an angle of between about 6 and 11 between said axis and the generatrix of said guide sleeve so as to limit the lateral expansion of the exploding charge and concentrate the same toward the surface of said object.
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially flat front face which is spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a substantially frusto-conical guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said front face of said explosive charge and having an axis substantially perpendicular to said flat front face of said explosive charge, said guide sleeve converging in the direction towards said object at an angle of between about 5.0 and 9.l between said axis and the generatrix of said frusto-conical sleeve so as to limit the lateral expansion of the exploding charge and concentrate the same toward the surface of said object.
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially flat substantially circular front face which is spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object, and a substantially frusto-conical guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said front face of said explosive charge and having an axis substantially perpendicular to said circular fiat front face of said explosive charge passing through the center of the same, said guide sleeve converging in the direction towards said object at an angle of between about 6 and 11 between said axis and the generatrix of said frusto-conical sleeve so as to limit the lateral expansion of the exploding charge and concentrate the same toward the surface of said object.
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially flat, substantially circular, front face, of which is spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a substantially frusto-conical guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said circular fiat front face of said explosive charge and having an axis extending perpendicular to said circular flat front face from the center of the same, said guide sleeve converging in the direction toward said object at an angle in the region of 6.8 between the axis and the generatrix of said frusto-conical sleeve and extending forward of said front face for a distance, measured in axial direction of said guide sleeve, equal to between 1.8 times and 5 times the diameter of said circular front face so that said converging guide sle
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially flat, substantially circular, front face which is spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a substantially frusto-conical guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said circular fiat front face of said explosive charge and having an axis extending perpendicular to said circular flat front face from the center of the same, said guide sleeve converging in the direction toward said object at an angle in the region of 6.8 between the axis and the generatrix of said frusto-conical sleeve and extending forward of said front face for a distance, measured in axial direction of said guide sleeve, equalto between 1.8 times and 5 times the diameter of said circular front face, the inner diameter of the forward end portion of said circular front
  • a stationary explosive demolition device comprising, in combination, an explosive charge being enclosed in a jacket and having a fiat front face so that upon detonation the exploding charge will emanate from said front face toward an object to be subjected to explosive force; and a guide sleeve connected to said jacket and extending forwardly of said explosive charge substantially surrounding said front face thereof and substantially coaxial with the same, said guide sleeve converging in forward direction at an angle of between 6 and 11 between its axis and its generatrix and extending forwardly of said front face of said explosive charge for a distance equal to between 1.8 times and 5 times the largest diameter of said front face of said explosive charge so that said converging guide sleeve will limit the lateral expansion of the exploding charge and concentrate the same in forward direction.
  • a stationary explosive demolition device comprising, in combination, an explosive charge being enclosed in a jacket and having a flat substantially circular front face so that upon detonation the exploding charge will emanate from said front face toward an object to be subjected to explosive force; and a substantially frustoconical guide sleeve connected to said jacket and extending forwardly of said explosive charge substantially surrounding said front face thereof and substantially coaxial with the same, said guide sleeve converging in forward direction at an angle in the region of 68 between its axis and its generatrix and extending forwardly of said front face of said explosive charge for a distance equal to between 1.8 times and 5 times the diameter of said circular front face of said explosive charge, the forward end portion of said guide sleeve have an inner diameter equal to between 0% and 15% of the diameter of said circular front face of said explosive charge, so that said converging guide sleeve will limit the lateral expansion of the exploding charge and concentrate the same in forward direction.
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially fiat front face which is spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a conical guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said front face of said explosive charge and having an axis substantially perpendicular to said flat front face of said explosive charge, said guide sleeve converging in the direction towards said object at an angle in the region of 9.8 between said axis and the generatrix of said conical sleeve so as to limit the lateral expansion of the exploding charge and concentrate the same toward the surface of said object.
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially fiat, substantially circular, front face, which is spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a conical guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said circular flat front face of said explosive charge and having an axis extending perpendicular to said circular flat front face from the center of the same, said guide sleeve converging in the direction toward said object at an angle of between 6 and 11 between the axis and the generatrix of said conical sleeve and extending forward of said front face for a distance, measured in axial direction of said guide sleeve, equal to between 1.8 times and 5 times the diameter of said circular front face so that said converging guide sleeve will limit the lateral expansion of the explod
  • a stationary demolition arrangement comprising, in combination, an object to be subjected to explosive force; an explosive device including an explosive charge having a substantially flat, substantially circular, front face, which 'is spaced from and directed toward the surface of said object so that upon detonation the exploding charge will emanate from said front face toward said object; and a substantially frusto-conical guide sleeve interposed at least between said explosive device and said object, said guide sleeve substantially surrounding said circular flat front face of said explosive charge and having an axis extending perpendicular to said circular flat front face from the center of the same, said guide sleeve converging in the direction toward said object at an angle in the region 6.8 between the axis and the generatrix of said frusto-conical sleeve and extending forward of said front face for a distance, measured in axial direction of said guide sleeve, equal to between 1.8 times and 5 times the diameter of said circular front face, the inner diameter of the forward end portion of said

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Powder Metallurgy (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
US167550A 1956-07-27 1962-01-22 Explosive demolition arrangement Expired - Lifetime US3159102A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEW19487A DE974557C (de) 1956-07-27 1956-07-27 Verfahren zur Lenkung und Verstaerkung der Wirkung von Sprengkoerpern
DEW29310A DE1130344B (de) 1956-07-27 1961-01-21 Sprengkoerper mit gelenkter und verstaerkter Wirkung

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US3159102A true US3159102A (en) 1964-12-01

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US167550A Expired - Lifetime US3159102A (en) 1956-07-27 1962-01-22 Explosive demolition arrangement

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US (1) US3159102A (xx)
BE (1) BE559473A (xx)
CH (2) CH372234A (xx)
DE (2) DE974557C (xx)
GB (2) GB855932A (xx)
NL (1) NL264322A (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3755079A (en) * 1969-12-12 1973-08-28 Atomic Energy Commission Nuclear reactor plant with integral entombment
US4111126A (en) * 1969-01-14 1978-09-05 Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter Haftung Warhead for use against armored targets
US5233926A (en) * 1991-06-05 1993-08-10 Inco Limited Adhesive secondary blasting cone
US7331268B1 (en) * 2004-06-02 2008-02-19 The United States Of America As Represented By The Secretary Of The Navy Explosive neutralization method and device
PL441724A1 (pl) * 2022-07-13 2024-01-15 Wojskowy Instytut Techniczny Uzbrojenia Kierunkowe urządzenie wybuchowe

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977880C (de) * 1963-01-24 1972-01-20 Messerschmitt Boelkow Blohm Sprengkoerper mit gelenkter und verstaerkter Wirkung
DE1267582B (de) * 1963-07-05 1968-05-02 Dynamit Nobel Ag Vorsatzduese fuer Hohlsprengladungen
US4982665A (en) * 1973-11-29 1991-01-08 The United States Of America As Represented By The Secretary Of The Navy Shaped charge
DE3224516A1 (de) * 1982-07-01 1984-01-05 Diehl GmbH & Co, 8500 Nürnberg Hohlladung
GB9219818D0 (en) * 1992-09-18 1992-10-28 Explosive Dev Ltd Improvements in or relating to target deforming means
GB2595699B (en) * 2020-06-04 2024-03-20 Bae Systems Plc Improved shaped charge device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2359301A (en) * 1941-03-22 1944-10-03 Joseph H Church Projectile
US2419414A (en) * 1941-10-03 1947-04-22 Sageb Sa Projectile
US2521739A (en) * 1946-07-16 1950-09-12 Leo T Meister Fuse for bombs
GB645611A (en) * 1943-08-10 1950-11-01 Ici Ltd Improvements in or relating to devices intended to effect the penetration of an object by the detonation of an explosive charge on the exterior thereof, for military andlike uses
US2605703A (en) * 1944-07-06 1952-08-05 Du Pont Liner for hollow charges
US2679380A (en) * 1948-10-08 1954-05-25 William G Sweetman Apparatus for advancing well bores by explosives

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE504149A (xx) *
NL66224C (xx) * 1945-11-07
NL78744C (xx) * 1950-05-11

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2359301A (en) * 1941-03-22 1944-10-03 Joseph H Church Projectile
US2419414A (en) * 1941-10-03 1947-04-22 Sageb Sa Projectile
GB645611A (en) * 1943-08-10 1950-11-01 Ici Ltd Improvements in or relating to devices intended to effect the penetration of an object by the detonation of an explosive charge on the exterior thereof, for military andlike uses
US2605703A (en) * 1944-07-06 1952-08-05 Du Pont Liner for hollow charges
US2521739A (en) * 1946-07-16 1950-09-12 Leo T Meister Fuse for bombs
US2679380A (en) * 1948-10-08 1954-05-25 William G Sweetman Apparatus for advancing well bores by explosives

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4111126A (en) * 1969-01-14 1978-09-05 Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter Haftung Warhead for use against armored targets
US3755079A (en) * 1969-12-12 1973-08-28 Atomic Energy Commission Nuclear reactor plant with integral entombment
US5233926A (en) * 1991-06-05 1993-08-10 Inco Limited Adhesive secondary blasting cone
US7331268B1 (en) * 2004-06-02 2008-02-19 The United States Of America As Represented By The Secretary Of The Navy Explosive neutralization method and device
PL441724A1 (pl) * 2022-07-13 2024-01-15 Wojskowy Instytut Techniczny Uzbrojenia Kierunkowe urządzenie wybuchowe

Also Published As

Publication number Publication date
NL264322A (xx) 1964-06-10
CH379990A (de) 1964-07-15
BE559473A (xx) 1957-08-14
DE974557C (de) 1961-02-09
GB917886A (en) 1963-02-06
DE1130344B (de) 1962-05-24
CH372234A (de) 1963-09-30
GB855932A (en) 1960-12-14

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