(19)
(11) EP 0 347 075 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.08.1990 Bulletin 1990/35

(43) Date of publication A2:
20.12.1989 Bulletin 1989/51

(21) Application number: 89305591.3

(22) Date of filing: 02.06.1989
(51) International Patent Classification (IPC)4E04G 23/00, B08B 15/02
(84) Designated Contracting States:
DE FR GB IT NL SE

(30) Priority: 17.06.1988 US 207821

(71) Applicant: TEKTRONIX INC.
Beaverton Oregon 97077-0001 (US)

(72) Inventors:
  • Hutchins, Ralph J.
    Forest Grove Oregon 97116 (US)
  • Brewer, Joseph A.
    Beaverton Oregon 97005 (US)

(74) Representative: Molyneaux, Martyn William et al
c/o Ladas & Parry, Altheimer Eck 2
D-80331 München
D-80331 München (DE)


(56) References cited: : 
   
       


    (54) Asbestos removal system


    (57) A method and apparatus is disclosed for the safe removal of asbestos-containing materials present in buildings in the form of ceiling or wall panels and the like. The apparatus includes a panel-sized containment bin (10) which includes rotary saws (12) that extend outward therefrom to cut loose the asbestos-containing materials. A protective surfactant is first applied to the material to be removed, and the material is then sawed into conveniently sized panels using slow-speed cutting heads and both primary and secondary negative air pressure systems so as to capture within the containment bin (10) any asbestos fibers that become airborne. An encapsulant is also applied to the materials being removed immediately after cutting. The invention may be used for both vertical or horizontal panel installations. The apparatus is mobile and self-propelled, and may be remotely operated to give additional operator safety. The invention when in use has limited the production of residual airborne asbestos fibers to an average of 0.0032 fibers/cc, of fibers over 5 microns long and having an aspect ratio of 3:1, the range of such fiber counts over 15 measurements being 0.0024-0.0047 fibers/cc with a standard deviation of 0.00096.





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