(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 |
(22) |
Date of filing: 02.06.1989 |
|
|
(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) |
|
|
|
(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.
