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FR2251178A5 - Cutting rock in tunnels - plasma jetted onto rock forms arc current path along layer to electrode - Google Patents

Cutting rock in tunnels - plasma jetted onto rock forms arc current path along layer to electrode

Info

Publication number
FR2251178A5
FR2251178A5 FR7339745A FR7339745A FR2251178A5 FR 2251178 A5 FR2251178 A5 FR 2251178A5 FR 7339745 A FR7339745 A FR 7339745A FR 7339745 A FR7339745 A FR 7339745A FR 2251178 A5 FR2251178 A5 FR 2251178A5
Authority
FR
France
Prior art keywords
rock
electrode
jet
layer
plasma
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
FR7339745A
Other languages
French (fr)
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.)
Humphreys Corp
Original Assignee
Humphreys Corp
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 Humphreys Corp filed Critical Humphreys Corp
Priority to FR7339745A priority Critical patent/FR2251178A5/en
Application granted granted Critical
Publication of FR2251178A5 publication Critical patent/FR2251178A5/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
    • B28D1/221—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising by thermic methods
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/08—Wrecking of buildings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10—Making by using boring or cutting machines
    • E21D9/1073—Making by using boring or cutting machines applying thermal energy, e.g. by projecting flames or hot gases, by laser beams
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/341—Arrangements for providing coaxial protecting fluids

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

Cutting rock or concrete in tunnels etc. is effected by directing a main plasma jet burner onto the rock face so that a layer of rock is melted which, together with the jet, is contacted with a second electrode which thus draws the plasma jet out over the layer of molten rock. Voltage is now applied between the electrode and the jet so as to strike an arc through the plasma so that current now flows from burner to electrode by way of the jet. The effect is to heat up the rock below the molten layer in addition to this layer and so form an incision in the rock face. The second or counter electrode should be formed by a jet of plasma directed onto the molten layer, or again should be made of graphite.
FR7339745A 1973-11-08 1973-11-08 Cutting rock in tunnels - plasma jetted onto rock forms arc current path along layer to electrode Expired FR2251178A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7339745A FR2251178A5 (en) 1973-11-08 1973-11-08 Cutting rock in tunnels - plasma jetted onto rock forms arc current path along layer to electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7339745A FR2251178A5 (en) 1973-11-08 1973-11-08 Cutting rock in tunnels - plasma jetted onto rock forms arc current path along layer to electrode

Publications (1)

Publication Number Publication Date
FR2251178A5 true FR2251178A5 (en) 1975-06-06

Family

ID=9127472

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7339745A Expired FR2251178A5 (en) 1973-11-08 1973-11-08 Cutting rock in tunnels - plasma jetted onto rock forms arc current path along layer to electrode

Country Status (1)

Country Link
FR (1) FR2251178A5 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990013406A1 (en) * 1989-05-03 1990-11-15 Universite De Sherbrooke Method and apparatus for treating a surface of granite with a high temperature plasma jet
DE19858618A1 (en) * 1998-12-18 2000-07-06 Joachim Schilling Anlagen Und Thermal separation of electrically non-conducting materials, esp. concrete with/without steel reinforcement, involves continuously melting cutting gap along defined line of any shape, direction
DE10051087C1 (en) * 2000-10-14 2002-06-13 Julius Pretterebner Material breaking up process involves creating thermal stresses by applying electromagnetic radiation to at least some regions of material to be broken up

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990013406A1 (en) * 1989-05-03 1990-11-15 Universite De Sherbrooke Method and apparatus for treating a surface of granite with a high temperature plasma jet
US5211156A (en) * 1989-05-03 1993-05-18 Universite De Sherbrooke Method and apparatus for treating a surface of granite with a high temperature plasma jet
DE19858618A1 (en) * 1998-12-18 2000-07-06 Joachim Schilling Anlagen Und Thermal separation of electrically non-conducting materials, esp. concrete with/without steel reinforcement, involves continuously melting cutting gap along defined line of any shape, direction
DE10051087C1 (en) * 2000-10-14 2002-06-13 Julius Pretterebner Material breaking up process involves creating thermal stresses by applying electromagnetic radiation to at least some regions of material to be broken up

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Legal Events

Date Code Title Description
ST Notification of lapse