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

A method for producing a formwork pipe (1) consists of flat material by winding on a winding machine, in which, in order to form a tubular blank (1 '') by means of a multilayer casing tube wall (2) a plurality of webs (4a, 4b) of the flat material with the use of a winding mandrel (3) are wound spirally in such a way that each of said web (4a, 4b) layer formed (4a'', 4b '') of the formwork pipe wall (2) of at least overlaps an adjacent position, while between at least one of the winding mandrel (3) adjacent layer (4a'') and a further position in the winding at least one release cord (11) is introduced, and with the respective formwork pipe (1) by separating the strip from the blank (1 '') is generated, characterized in that the release cord (11) from a with at least one sensor detectable material that, during or after the separation of the respective shuttering pipe (1) of the blank (1'') with the aid of at least one detector device (20) the position of the release cord (11) within the formwork pipe (1) is detected and to an externally - and / or inner surface of the..