Patent ID: 6478921
Filing Date: 2002-11-12
Classification: B29C,Y10T

Abstract:
A method for producing ends of metal of composite pipe lengths comprising a casing pipe of metal and a load-carrying sheath of reinforced plastics, which sheath is produced by applying reinforcement onto said casing pipe and filling said reinforcement with resin through injection under vacuum by pipes or cannulas, said reinforcement comprising a first reinforcement layer closest to the casing pipe for carrying peripheral loads and a second reinforcement layer on the outside of the first reinforcement layer for carrying axial loads on the pipe, characterized in that a sleeve of the same metal as the casing pipe and with a same thickness of material as the first reinforcement layer is attached to the casing pipe at both ends of said casing pipe, wherein at least one of said sleeves are provided with axial through holes for injection pipes and vacuum connections, that the first reinforcement layer is applied thereafter to a same thickness of material as the sleeves over the whole length of the casing pipe between the sleeves and placing, successively simultaneously, injection pipes in parallel relationship to a longitudinal axis of the casing pipe, that a sheet metal strip of the same metal as said casing pipe and with a greater width than the axial length of the sleeves is attached to said sleeves, respectively, and wound together with the second reinforcement layer onto the sleeves as well as onto a part of the first reinforcement layer, the sheet metal strip having a steplike reduced thickness in a direction of its width to a depth corresponding to a thickness of material of the second reinforcement layer, so that said second reinforcement layer will be placed between the winding layers of the sheet metal strip, while the part of the winding layers of the sheet metal strip not being stepped will lie upon each other without any intermediate reinforcement, forming an end surface totally of metal at the pipe length, the pipe length then being finished by injection of a suitable polymer in both reinforcement layers.