Method and apparatus for removing contaminants from a duct or pi

Details Method and apparatus for removing contaminants from a duct or pi Method and apparatus for removing contaminants from a duct or pi

1994-05-16

1995-11-14

Schoeppel, Roger J.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Lining

156293, 264516, E21D 1100

Patent

active

054660939

ABSTRACT:
Contaminants are removed from the interior or a duct by the introduction within the duct of a tube having a coating of a curable, strippable resin using an everting/inverting membrane assembly. The coated tube is contained within the inverted membrane assembly and urged against the walls of the duct as the membrane is everted. The coated tube extends through an open end of the duct and is secured to the duct to retain the tube within the duct. The membrane is again inverted for the resin to cure and adhere contaminants to the tube. Another membrane assembly is then everted with the tube, the tube is secured to the membrane assembly, and withdrawn within the membrane as the membrane is inverted from within the duct. The contaminants are contained with the inverted membrane for analysis or disposal. In one embodiment, a towing membrane assembly is inserted through a second open end of the duct and attached to the tube-carrying membrane. The towing membrane assembly is inverted and the tube-carrying membrane is everted to assist the tube-carrying membrane to negotiate bends and junctions within the duct assembly.

REFERENCES:
patent: 4064211 (1977-12-01), Wood
patent: 4366012 (1982-12-01), Wood
patent: 4434115 (1984-02-01), Chick
patent: 4456401 (1984-06-01), Williams
patent: 4622196 (1986-11-01), Wood
patent: 4680066 (1987-07-01), Wood
patent: 4685983 (1987-08-01), Long
patent: 4776370 (1988-10-01), Long
patent: 4778553 (1988-10-01), Wood
patent: 5176207 (1993-01-01), Keller

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