Method for making large diameter water pipes comprises producing core pipe consisting of sheet metal cylinder fitted with concrete lining and outer coating, winding this with steel strip and coating with flowable cement inside sleeve

摘要

The method for making large diameter water pipes comprises first producing a core pipe consisting of a sheet metal cylinder (3) fitted with a concrete lining (4) and outer coating (5). This is then wound with steel strip (6) and a coating of flowable cement (7) applied inside an outer sleeve. An Independent claim is included for a pipe prepared by the method.