US3738288A - Thermic lance - Google Patents

Thermic lance Download PDF

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Publication number
US3738288A
US3738288A US00220787A US3738288DA US3738288A US 3738288 A US3738288 A US 3738288A US 00220787 A US00220787 A US 00220787A US 3738288D A US3738288D A US 3738288DA US 3738288 A US3738288 A US 3738288A
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United States
Prior art keywords
tube
lance
rods
thermic lance
zone
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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
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US00220787A
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English (en)
Inventor
E Brandenberger
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.)
Kubatec Kunststoff und Bautechnik AG
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Kubatec Kunststoff und Bautechnik AG
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/14—Drilling by use of heat, e.g. flame drilling
    • E21B7/146—Thermal lances

Definitions

  • ABSTRACT A thermic lance which is operated by gaseous combustion and serves for forming openings, cavities or grooves in hard material such'as concrete, stone, building walls and the like.
  • the lance is equipped with a steel tube packed with a plurality of steel rods.
  • the present invention relates to a thermic lance which is operated by gaseous combustion and serves for forming cavities, grooves or openings in hard material such as concrete, stone, building walls, severing reinforced concrete, hard to clear material and the like.
  • Thermal lances are subject to vibrations during the burning out process. As a result, that the core wires when held only by friction may somewhat alter their mutual locations, and may become somewhat loosened within the tubular shell. Moreover the oxygen pressure, which normally is up to some 110 to 220 psi, acts upon the face of the core wires at the end of the lance which is remote of the burning point. It may happen that for example a single wire becomes loose from the corewire group and be moved in the direction of the flow of the oxygen gas.
  • a loose wire may burn more quickly away than the others or may be ejected when the break-through of the wall occurs or when the lance is withdrawn from the opening. But as soon as one of the core wires is lacking, the remaining wires also become loose within the tubular shell, so that finally the whole group or parcel of core wires no longer has any anchorage in the tubular shell.
  • a further object of the present invention is to provide a method for manufacturing thermal lances in a highly efficient manner.
  • FIG. I is a plan view of the end zone of a lance
  • FIG. 2 is a section through the circular part of the thermic lance along the line [I II of FIG. 1, and
  • FIG. 3 is a section through the oval part of the ther- -mic lance along the line III III in FIG. 1.
  • the thermic lance 1 serves for the production of bores, apertures or openings in concrete, rock, stone walls, mineral material or other hard material, by means of a burning process.
  • the flame for cutting is obtained by a method in which oxygen of high purity is blown under pressure through a tubular shell filled with wires from one end to the other and the front end of the lance is brought up to ignition temperature. In this way combustion is initiated and developed at this end of the lance by a self-supporting thermal reaction with such an evolution of heat that concrete, rock and similar materials are fused and the combustible material is burnt. In doing this thermic lance itself is successively consumed and must be replaced from time to time.
  • the thermic lance incorporates a tubular shell 2 of unalloyed steel (iron), usually several meters long; it may be a usual commercially available gas wire.
  • Core tube 3 of round section and equal thickness to one another of unalloyed steel (iron) are drawn into this tubular shell 2, and the number of these core wires 3 is so chosen that they fill the clearance section within the round enclosing tube or tubular shell 2 as well as possible, but without making the drawing of these core wires 3 into the tubular shell difficult.
  • a tubular shell 2 with an inside diameter of one-half inch and 11 core wires has proved satisfactory.
  • These core wires 3 advantageously consist of commercial structural steel used for example for reinforced concrete. There remain between the individual wires 3 and between the wires and the internal wall of the tubular shell interspaces or ducts 5 running longitudinally for the passage of the oxygen.
  • the tubular shell 2 is provided at each end with a short external thread 4, so that on the one hand two such tubes can be joined together by a coupling sleeve screwed onto them and on the other hand the other end of the tube can be connected to a hose which is connected in its turn to a source of oxygen under pressure.
  • the core wires 3 according to my U.S. Pat. No. 3,570,419 are held inside the tubular shell 2 as a result of the deformation of the tubular shell to an oval shape entirely by the clamping effect or, in other words, by the friction of the wires one with another and on the inner wall of the tube.
  • a flat arcuate divergence 6 or curvature is imparted to the tubular shell 2 and thus to the core wires 3 located within it, as can be seen from FIG. 1.
  • This divergence 6 is located at the gasconnection end in the oval part or otherwise deformed part, near one end of the lance.
  • the inside sectional shape of this slightly curved or arched part should remain as far as possible unaltered in relation to the neighbouring oval part, so that the ducts for the passage of the oxygen are not restricted in section in this curved zone.
  • the length a of the tubular shell 2 with a circular sectional shape is about the same length as the chord length 0 of the curved part 6.
  • the oval zone b lying between these is considerably shorter than the lengths a or c and preferably amounts to about one half or rather less.
  • the chord length c is preferably about four to six times the outside diameter of the tubular shell 2 in the circular part.
  • the divergent zone 6 is flat, that is, the height h of this zone is small in relation to the section dimensions of the tubular shell 2; it is smaller than the outer diameter of the round tubular shell at the connection ends.
  • the height of the divergent zone H onesixth to one-half of the external diameter of the tubular I shell 2 in the circular connection zones.
  • the divergent zone is effected upon the flat side of the oval; that is, the arcuate divergence is produced flat-edged and not high-edged.
  • Manufacturing of such thermic lances is effected by first drawing such a number of core wires 3 into atubular shell 2 having a round section over the whole length that the section is filled as well as possible. Thereafter the tubular shell 2 together with the 'core wires 3 it contains is with the exception of at least one end compressed in a press in a single action into an oval form, and simultaneously the arcuate divergence 6 already described imparted to the lance. Since the formation of the divergent zone-occurs simultaneously both in the tubular shell and also in all core wires in a single operation, this method of manufacture is particularly economical.
  • this tubular shell may be caused to assume cross-sectional shapes other than circular, for example a triangular, polygonal, half-round or other shapes, and the divergent zones 6 are provided in a similar manner, where here also it is ensured that the sectional shape in the divergent zone is as equal as possible to that of the sectional shape departing from a circular form in the principal part of the lance, in order to avoid a contraction of the oxygen ducts in the divergent zone 6.
  • Thermic lance for gaseous combustion for forming cavities, grooves or openings in hard material such as concrete, stone, building walls, comprising a metallic tube, and a plurality of metallic rods enclosed by said tube, said tube having gas connecting means at one end, intermediate spaces being formed between said rods and between said rods and said tube extending in the longitudinal direction of said tube serving for the conveyance of gas for combustion, and said tube having a cross-sectional shape other than circular except at least one of its end parts, in the vicinity of said gas connecting means said tube and said rods having at least one relatively flat divergence for securing said rods in said tube.
  • Thermic lance for gaseous combustion for forming cavities, grooves or openings in hard material such as concrete, stone, building walls, comprising an essentially straight metallic tube having end parts and an intermediate part, and a plurality of metallic rods located within and enclosed by said tube, said tube having gas connecting means at least at one end part, intermediate spaces being formed between said rods and said tube extending in the longitudinal direction of said tube serving for the conveyance of gas for combustion, and
  • said tube in the vicinity of said gas connecting means, having at least one relatively flat divergence from the straight axis of the tube for securing said rods in their location in said tube and prevent loosening of said rods in said tube.
  • height (h) of the divergent zone is smaller than half the external diameter of the tube in said end part and the chord length (a) of the divergent zone amounts to four to six times the external diameter of said end part of said tube.

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Gas Burners (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Earth Drilling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
US00220787A 1971-02-05 1972-01-26 Thermic lance Expired - Lifetime US3738288A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH172571A CH556724A (de) 1971-02-05 1971-02-05 Sauerstoff-brennlanze zur erzeugung von oeffnungen in beton, gestein, gebaeudemauern u. dgl.

Publications (1)

Publication Number Publication Date
US3738288A true US3738288A (en) 1973-06-12

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ID=4217134

Family Applications (1)

Application Number Title Priority Date Filing Date
US00220787A Expired - Lifetime US3738288A (en) 1971-02-05 1972-01-26 Thermic lance

Country Status (12)

Country Link
US (1) US3738288A (OSRAM)
JP (1) JPS5211126B1 (OSRAM)
AT (1) AT308615B (OSRAM)
BE (1) BE778861R (OSRAM)
CA (1) CA942653A (OSRAM)
CH (1) CH556724A (OSRAM)
DE (1) DE2202868C3 (OSRAM)
FR (1) FR2124967A6 (OSRAM)
GB (1) GB1381906A (OSRAM)
IT (1) IT1044969B (OSRAM)
NL (1) NL167005C (OSRAM)
SE (1) SE368965B (OSRAM)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921542A (en) * 1974-01-23 1975-11-25 Kubatec Kunststoff Oxygen supplied thermal lance
EP0000642A1 (en) * 1977-07-22 1979-02-07 Thormack Limited A method of sealing bridge deck joints
US4391209A (en) * 1981-06-16 1983-07-05 Arcair Company Exothermic cutting electrode
US4401040A (en) * 1981-10-21 1983-08-30 Volcano Corporation Thermal torch
US4437649A (en) 1981-06-16 1984-03-20 Arcair Company Exothermic cutting electrode
US4697791A (en) * 1985-12-31 1987-10-06 Arcair Company Exothermic cutting electrode
US4864093A (en) * 1988-10-05 1989-09-05 Arcair Company Exothermic cutting electrode
US5000426A (en) * 1989-08-15 1991-03-19 Edna Corporation Exothermic cutting torch
US5086720A (en) * 1991-01-25 1992-02-11 Kahlil Gibran Furnace for controllable combustion of thermite
US5622672A (en) * 1995-03-24 1997-04-22 Alloy Surfaces Co. Ignition of thermal lance and means and method for use therewith and therefor
US7691321B2 (en) 2006-04-13 2010-04-06 Air Products And Chemicals, Inc. Thermic lance
WO2018152651A1 (es) * 2017-02-21 2018-08-30 Trefimet S.A. Lanza térmica que comprende al menos un perfil tubular hueco de aluminio, y/o magnesio, entre otros materiales, que le permite ser utilizada en procesos que requieren una alta cantidad de energía para cortar, perforar y/o fundir materiales de alto requerimiento térmico

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19751918C2 (de) * 1997-11-22 2000-01-20 Mannesmann Sachs Ag Eindrückung in einen plastisch verformbaren Werkstoff

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460223A (en) * 1967-08-02 1969-08-12 Zsolt Gyorgy Berczes Device for fixing holes by method of smelting,especially into building walls made of concrete,granite,sandstone or limestone,and method of producing the device
US3500774A (en) * 1968-11-04 1970-03-17 Robert Meier Means for cutting hard construction materials
US3570419A (en) * 1968-01-03 1971-03-16 Ernst Brandenberger Thermic lance

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460223A (en) * 1967-08-02 1969-08-12 Zsolt Gyorgy Berczes Device for fixing holes by method of smelting,especially into building walls made of concrete,granite,sandstone or limestone,and method of producing the device
US3570419A (en) * 1968-01-03 1971-03-16 Ernst Brandenberger Thermic lance
US3500774A (en) * 1968-11-04 1970-03-17 Robert Meier Means for cutting hard construction materials

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921542A (en) * 1974-01-23 1975-11-25 Kubatec Kunststoff Oxygen supplied thermal lance
EP0000642A1 (en) * 1977-07-22 1979-02-07 Thormack Limited A method of sealing bridge deck joints
US4391209A (en) * 1981-06-16 1983-07-05 Arcair Company Exothermic cutting electrode
US4437649A (en) 1981-06-16 1984-03-20 Arcair Company Exothermic cutting electrode
US4401040A (en) * 1981-10-21 1983-08-30 Volcano Corporation Thermal torch
US4697791A (en) * 1985-12-31 1987-10-06 Arcair Company Exothermic cutting electrode
US4864093A (en) * 1988-10-05 1989-09-05 Arcair Company Exothermic cutting electrode
US5000426A (en) * 1989-08-15 1991-03-19 Edna Corporation Exothermic cutting torch
US5086720A (en) * 1991-01-25 1992-02-11 Kahlil Gibran Furnace for controllable combustion of thermite
US5622672A (en) * 1995-03-24 1997-04-22 Alloy Surfaces Co. Ignition of thermal lance and means and method for use therewith and therefor
US7691321B2 (en) 2006-04-13 2010-04-06 Air Products And Chemicals, Inc. Thermic lance
WO2018152651A1 (es) * 2017-02-21 2018-08-30 Trefimet S.A. Lanza térmica que comprende al menos un perfil tubular hueco de aluminio, y/o magnesio, entre otros materiales, que le permite ser utilizada en procesos que requieren una alta cantidad de energía para cortar, perforar y/o fundir materiales de alto requerimiento térmico

Also Published As

Publication number Publication date
IT1044969B (it) 1980-04-21
CA942653A (en) 1974-02-26
NL167005C (nl) 1981-10-15
SE368965B (OSRAM) 1974-07-29
DE2202868A1 (de) 1972-08-17
DE2202868B2 (de) 1981-05-07
JPS5211126B1 (OSRAM) 1977-03-29
NL7201458A (OSRAM) 1972-08-08
GB1381906A (en) 1975-01-29
AT308615B (de) 1973-07-10
NL167005B (nl) 1981-05-15
CH556724A (de) 1974-12-13
DE2202868C3 (de) 1982-01-21
BE778861R (fr) 1972-05-30
FR2124967A6 (OSRAM) 1972-09-22

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