Patent ID: 6899842
Filing Date: 2005-05-31
Classification: B29C,B29D,B29K,B29L,D04C,D10B,F16L

Abstract:
1. A process for laying a cylindrical pipe in a trench (T) open at the top, starting from a section of flattened flexible tubular preform ( 1 , 9 ), capable of being made round but not radially expansible by inflation due to the effect of internal pressure, wherein the wall of the preform ( 1 , 9 ) includes a filamentary reinforcement ( 2 ) surrounding an inner sealing skin ( 10 ), characterized in that, on the one hand, this laying process is carried out without the wall of the preform ( 1 , 9 ) being turned over on itself, and, on the other hand, the process is carried out in the following manner: a) the section of preform ( b) the reinforcement ( c) the section of resin-impregnated preform ( d) the section of preform ( e) the resin (