Compositions and methods for in-situ macro-encapsulation treatment of friable asbestos fibers generated by trenchless pipe bursting of asbestos cement pipe

摘要

#$%^&*AU2017202612B220190509.pdf#####1 ABSTRACT OF THE DISCLOSURE 2 3 Equipment, process and techniques are shown for rehabilitating old underground pipelines, 4 particularly asbestos pipelines, in which an old underground pipeline is replaced, as by drawing a 5 bursting head through the old pipe to burst it and simultaneously pulling a new pipe through 6 behind the bursting head. The invention has particular applicability to the rehabilitation of old 7 asbestos pipelines in which the burst up debris must be contained or encapsulated in some 8 manner. The macro-encapsulation materials shown form an in-situ layer of a temporarily fluid 9 macro-encapsulating material which absorbs and immobilizes asbestos fibers and pipe .0 fragments, the macro-encapsulating material being applied simultaneously as the pipe bursting .1 operation proceeds. .2 261/4 0 0 00 I IN I CN m Kn I C%4 I / I IO