IMPROVEMENTS RELATING TO THE LINING OF PIPELINES AND PASSAGEWAYS

摘要

2116966 9305333 PCTABS00020 The Insituform lining process is enhanced in that the resin impregnated lining tube (1) is everted into a collapsed preliner tube in the passageway to be lined, and a constraining means (6) permits the preliner tube to expand only at a location close to the everting face so that a pool of resin is formed between the everting face and the preliner tube adjacent the constraining means (6), preventing air from gaining access to the everting face.