A method for producing a formwork pipe made of flat material by spiral winding on a spiral winding machine as well as formwork pipe

摘要

The present invention relates to a new method for producing a formwork pipe made of flat material by winding on a winding machine, in which, in order to form a multilayer casing tube wall a number of strips of the flat material with the use of a winding mandrel are wound in such a way that the web of each layer formed of the formwork pipe wall of at least overlaps an adjacent position, while between at least one of the winding mandrel adjacent position and a further position in the winding at least one of a strip-shaped material is introduced is formed with release cord, and with the respective formwork pipe by separation of the blank is produced.