Process for separation of asbestos-containing material and prevention of floating of dust

• US 5,052,756 A
• Filed: 03/26/1990
• Issued: 10/01/1991
• Est. Priority Date: 03/04/1988
• Status: Expired due to Fees

• Current Assignee: JSE Corporation, Taisei Corporation
• Original Assignee: JSE Corporation, Taisei Corporation
• Inventors: Wada, Eiji, Nakano, Nobuo
• Primary Examiner(s): Bagnell, David J.
• Application Number:
  US07/501,346
• Time in Patent Office: 554 Days
• Field of Search: 134/21, 134/22.12
• US Class Current: 299/17
• CPC Class Codes: B05B 1/14 with multiple outlet openings B05B1/02, B05B1/26 take precedence; with strainers in or outside the outlet opening
• CPC Class Codes: B05B 15/16 for preventing non-intended contact between spray heads or nozzles and foreign bodies, e.g. nozzle guards
• CPC Class Codes: B05B 3/02 with rotating elements electric spraying discharge apparatus characterised by having rotary outlet or deflecting elements B05B5/04
• CPC Class Codes: B05B 3/026 the fluid passing axially from one joint element to another
• CPC Class Codes: B05B 9/01 Spray pistols, discharge devicesB05B9/03 takes precedence
• CPC Class Codes: B08B 3/028 Spray guns
• CPC Class Codes: B09B 3/0066 Disposal of asbestos
• CPC Class Codes: E04G 23/00 Working measures on existing buildings, domestic cleaning of walls or floors A47L11/00; grinding floors or walls B24B7/18; removing of wall coverings B44C7/00; removing of paint from surfaces B44D3/16; electrochemical desalination or re-alkalisation C04B41/00; on foundations E02D35/00, E02D37/00; in connection with insulations E04B; subsequent or finishing work E04F
• CPC Class Codes: E04G 23/08 Wrecking of buildings of fences E04H17/26; Demolition agents based on cementitious or like materials C04B41/0009
• CPC Class Codes: Y10T 83/0591 Cutting by direct application of fluent pressure to work

Abstract

A process is provided for separation of an asbestos-containing material from a surface to which the asbestos-containing material is adhered, while preventing floating of dust of the removed asbestos-containing material, the process requiring jetting of pressurized water from a plurality of nozzles to the surface at a pressure of at least 80 kg/cm² so as to wet and remove the asbestos-containing material therefrom by the energy possessed by the pressurized water.

Claims

1. A process for separation of an asbestos-containing material from a surface to which the asbestos-containing material is adhered while preventing release into the atmosphere of the separated asbestos-containing material as a fine dust, utilizing an elongated holder having a central longitudinal axis, a front axial end and a rear axial end, a nozzle head mounted on said front axial end of said holder and extending frontwardly therefrom, said nozzle head having a central axis that is parallel with and laterally offset from said central longitudinal axis of said holder, means for continuously revolving said nozzle head about said central longitudinal axis of said holder, said nozzle head having a plurality of space-apart nozzles arranged in a pattern on the front face thereof so that said nozzles move through separate circular paths when said nozzle head revolves around said central longitudinal axis of said holder, said nozzles having an orifice diameter of from 0.05 to 0.5 mm, which comprises the steps of:

continuously and unidirectionally revolving said nozzle head around said central longitudinal axis of said holder at a rate of 800 to 4000 rpm;

simultaneously moving said nozzle head substantially in parallel with said surface;

simultaneously supplying water at a pressure of 80 kg/cm² or higher at a volumetric flow rate not greater than 12 liters/min to said nozzles for thereby jetting said high pressure water from said nozzles against said surface, the loci of the streams of said high pressure water jetted from said nozzles overlapping each other as said revolving nozzle head is moved substantially in parallel with said surface; and

disposing a polymeric water absorbent material on a floor surface facing said surface from which said asbestos-containing material is separated.

2. The process according to claim 1, wherein:

said pressure of jetted pressurized water is in the range 80 kg/cm² to 1000 kg/cm².

3. The process according to claim 2, wherein:

said holder is mounted to a mobile stripping machine to support and move said revolving head securely to a maximum jetting pressure of 1000 kg/cm² during operation.

4. The process according to claim 3, wherein:

said holder disposes the nozzle head at a distance between 3 and 50 cm from the surface holding the asbestos-containing material.

5. The process according to claim 1, comprising the further step of:

rotating said nozzle head about a nozzle axis as said nozzle head is revolved around the central longitudinal axis of the holder.

6. The process according to claim 1, comprising the further step of:

prior to the other steps, applying a sheet of retaining material to enclose a space containing the surface from which the asbestos-containing material is to be separated.

7. The process according to claim 1, comprising the further step of:

pretreating the asbestos-containing material by first spraying an initial quantity of water thereto, and allowing 4-5 seconds to elapse before applying said pressurized water flow from said revolving nozzle head.

8. The process according to claim 1, comprising the further step of:

combining the polymeric water absorbent material and the separated asbestos-containing material with a cementitious material for solidification and burial thereof.

9. The process according to claim 1, wherein:

the pressurized water is jetted substantially in a mist form to the asbestos-containing material adhered to said surface,

thereby causing said asbestos-containing material to be wetted so as to cause the same to adhere to said jetted water of the mist and fall to the floor surface therewith.

10. A process for separation of an asbestos-containing material from a surface to which the asbestos-containing material is adhered while preventing release into the atmosphere of the asbestos-containing material as a fine dust, comprising the steps of:

disposing a polymeric water absorbent material on a floor surface facing the surface to which the asbestos-containing material is adhered;

jetting pressurized water from a plurality of nozzles to an exposed surface of said asbestos-containing material at a pressure of at least 80 kg/cm², to thereby wet and separate from the surface the asbestos-containing material by application thereto of energy possessed by the jetted flow of pressurized water; and

collecting and disposing of said separated wet asbestos-containing material and any of said jetted water that has fallen to the floor surface together with the polymeric water absorbent.

11. The process according to claim 10, comprising the further step of:

combining the polymeric water absorbent material and the separated asbestos-containing material with a cementitious material for solidification and burial thereof.

12. The process according to claim 10, wherein:

said polymeric water absorbent material is adhered to a base sheet spread over said floor surface.

13. The process according to claim 12, wherein:

said polymeric water absorbent material is distributed at a rate of 30 g/m² -1000 g/m² of the floor surface.