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USING PLASMA ARC AND THERMITE TO DEMOLISH CONCRETE
Patent number: 5532449
Filing date: Aug 29, 1994
Issue date: Jul 2, 1996
Filing date: Aug 29, 1994
Issue date: Jul 2, 1996
A
plasma arc can be employed to demolish a concrete structure at a high
efficiency, while preventing a secondary problem due to noise, flying
dust and chips, and the like. The concrete structure can be demolished
by melting a surface of the concrete structure by generating a plasma
arc from a plasma torch (15) of a plasma arc generator, mixing thermite
powder (T) with a supply gas (Gc) for the plasma torch (15), directing
the plasma arc at the surface of the concrete structure, and controlling
the rate of supply of the thermite powder (T) to the plasma torch (15)
in response to the operation of the plasma arc, including initiating and
stopping the supply of the thermite powder (T) to the plasma torch (15)
in a manner coordinated with the initiation and stoppage of the plasma
arc, thereby controlling the heat generated by the thermite reaction,
and melting the surface of the concrete structure. The plasma generator
(1) can be provided with a feeder (20) for mixing the thermite powder...
Inventor: Taku Murakami
Original Assignee: Kabushiki Kaisha Komatsu Seisakusho
Current U.S. Classification: 219/121.59; 219/70; 219/121.38; 219/121.44; 219/121.48; 266/48
International Classification: B23K 1000
View patent at USPTO
Search USPTO Assignment Database
Original Assignee: Kabushiki Kaisha Komatsu Seisakusho
Current U.S. Classification: 219/121.59; 219/70; 219/121.38; 219/121.44; 219/121.48; 266/48
International Classification: B23K 1000
View patent at USPTO
Search USPTO Assignment Database
Citations
| Cited Patent | Filing date | Issue date | Original Assignee | Title |
| US3740522 | Apr 12, 1971 | Jun 19, 1973 | FOR MAINTAINING TUBE CONCENTRICITY | |
| US3988566 | Jul 17, 1975 | Oct 26, 1976 | Metco Inc. | Automatic plasma flame spraying process and apparatus |
| US4371771 | Nov 10, 1980 | Feb 1, 1983 | The United States of America as represented by the Secretary of the Navy | Cutting torch and method |
| US4477060 | Jun 13, 1983 | Oct 16, 1984 | Underwater cutting tool | |
| US4541616 | May 23, 1984 | Sep 17, 1985 | Thermal burning rod | |
| US4559890 | Apr 25, 1983 | Dec 24, 1985 | Jet Research Center, Inc. | Mooring release apparatus and method |
| US4766284 | Mar 5, 1986 | Aug 23, 1988 | Maghemite Inc. | Production of compounds by reaction of solid materials at high temperatures produced by plasma arc torches |
Referenced by
| Citing Patent | Filing date | Issue date | Original Assignee | Title |
| US5773785 | Jun 7, 1996 | Jun 30, 1998 | Komatsu Ltd. Daido Tokushuko Kabushiki Kaisha | Plasma cutting apparatus for concrete structures |
Claims
1. A method of demolishing a concrete structure, comprising the steps of:
3. A method in accordance with claim 1, wherein said step of controlling comprises manipulating the rate of supplying the thermite powder to the plasma arc in response to the operation of the plasma torch, including initiating and stopping the supplying of the thermite powder to the plasma arc in a manner coordinated with the initiation and stoppage of the plasma arc, thereby controlling the heat generated by the thermite reaction.
4. A method in accordance with claim 3, wherein the step of manipulating comprises varying the rate of addition of the thermite powder to the supply gas in response to the operation of the plasma torch.
5. A method in accordance with claim 1, wherein said step of controlling includes initiating and stopping the supplying of said thermite powder to the plasma arc in a manner coordinated with the initiation and stoppage of the plasma arc.
6. A method in accordance with claim 1, wherein said step of mixing comprises mixing said thermite powder, said supply gas, and at least one material selected from the group consisting of agents to control a thermite reaction starting temperature.
7. A method in accordance with claim 1, wherein said step of mixing comprises mixing said thermite powder, said supply gas, and at least one material selected from the group consisting of agents to lower the melting point of concrete.
8. A method in accordance with claim 1, wherein said steps of generating a plasma arc from said plasma torch and directing the plasma arc containing said mixture toward a surface of the concrete structure comprise:
10. A method in accordance with claim 9, wherein the step of controlling comprises varying the rate of addition of the thermite powder to the supply gas in response to the operation of the plasma torch.
11. A method in accordance with claim 9, wherein said step of controlling comprises manipulating the rate of supplying the thermite powder to the plasma arc in response to the operation of the plasma torch, including initiating and stopping the supplying of the thermite powder to the plasma arc in a manner coordinated with the initiation and stoppage of the plasma arc, thereby controlling the heat generated by the thermite reaction.
12. A method in accordance with claim 11, wherein the step of manipulating comprises varying the rate of addition of the thermite powder to the supply gas in response to the operation of the plasma torch.
13. A method in accordance with claim 9, wherein said step of controlling includes initiating and stopping the supplying of said thermite powder to the plasma arc in a manner coordinated with the initiation and stoppage of the plasma arc.
14. A method in accordance with claim 9, wherein said step of mixing comprises mixing said thermite powder, said supply gas, and at least one material selected from the group consisting of agents to control a thermite reaction starting temperature.
15. A method in accordance with claim 9, wherein said step of mixing comprises mixing said thermite powder, said supply gas, and at least one material selected from the group consisting of agents to lower the melting point of concrete.
- generating a plasma arc from a plasma torch of a plasma arc generator,
- mixing thermite powder with a supply gas for said plasma torch,
- passing the resulting mixture into the thus generated plasma arc,
- directing the plasma arc containing said mixture toward a surface of the concrete structure, and
- controlling the supplying of said thermite powder to the plasma arc responsive to the operation of the plasma torch, thereby melting at least a portion of the surface of the concrete structure.
3. A method in accordance with claim 1, wherein said step of controlling comprises manipulating the rate of supplying the thermite powder to the plasma arc in response to the operation of the plasma torch, including initiating and stopping the supplying of the thermite powder to the plasma arc in a manner coordinated with the initiation and stoppage of the plasma arc, thereby controlling the heat generated by the thermite reaction.
4. A method in accordance with claim 3, wherein the step of manipulating comprises varying the rate of addition of the thermite powder to the supply gas in response to the operation of the plasma torch.
5. A method in accordance with claim 1, wherein said step of controlling includes initiating and stopping the supplying of said thermite powder to the plasma arc in a manner coordinated with the initiation and stoppage of the plasma arc.
6. A method in accordance with claim 1, wherein said step of mixing comprises mixing said thermite powder, said supply gas, and at least one material selected from the group consisting of agents to control a thermite reaction starting temperature.
7. A method in accordance with claim 1, wherein said step of mixing comprises mixing said thermite powder, said supply gas, and at least one material selected from the group consisting of agents to lower the melting point of concrete.
8. A method in accordance with claim 1, wherein said steps of generating a plasma arc from said plasma torch and directing the plasma arc containing said mixture toward a surface of the concrete structure comprise:
- positioning an anodic dummy electrode on said surface between said surface and said plasma torch, and
- generating said plasma arc to said dummy electrode.
10. A method in accordance with claim 9, wherein the step of controlling comprises varying the rate of addition of the thermite powder to the supply gas in response to the operation of the plasma torch.
11. A method in accordance with claim 9, wherein said step of controlling comprises manipulating the rate of supplying the thermite powder to the plasma arc in response to the operation of the plasma torch, including initiating and stopping the supplying of the thermite powder to the plasma arc in a manner coordinated with the initiation and stoppage of the plasma arc, thereby controlling the heat generated by the thermite reaction.
12. A method in accordance with claim 11, wherein the step of manipulating comprises varying the rate of addition of the thermite powder to the supply gas in response to the operation of the plasma torch.
13. A method in accordance with claim 9, wherein said step of controlling includes initiating and stopping the supplying of said thermite powder to the plasma arc in a manner coordinated with the initiation and stoppage of the plasma arc.
14. A method in accordance with claim 9, wherein said step of mixing comprises mixing said thermite powder, said supply gas, and at least one material selected from the group consisting of agents to control a thermite reaction starting temperature.
15. A method in accordance with claim 9, wherein said step of mixing comprises mixing said thermite powder, said supply gas, and at least one material selected from the group consisting of agents to lower the melting point of concrete.
Drawings
http://www.google.com/patents/US5532449
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ETHICAL DONATORS AND COMMUNITY MEMBERS REQUIRED, TO FILL THIS SPACE WITH YOUR POLITICAL SLOGANS, ADVERTISING OFFERS, WEBSITE DETAILS, CHARITY REQUESTS, LECTURE OPPORTUNITIES, EDUCATIONAL WORKSHOPS, SPIRITUAL AND/OR HEALTH ENLIGHTENMENT COURSES.
AS AN IMPORTANT MEMBER OF THE GLOBAL INDEPENDENT MEDIA COMMUNITY, MIKIVERSE 9/11 HONOURABLY REQUESTS YOUR HELP TO KEEP YOUR NEWS, DIVERSE,AND FREE OF CORPORATE, GOVERNMENT SPIN AND CONTROL. FOR MORE INFORMATION ON HOW YOU MAY ASSIST, PLEASE CONTACT: themikiverse@gmail.com
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