Tubular construction system for flue lining has first tubular elements with external thread in maximum diameter zone of connection region

摘要

The tubular construction system has first tubular elements (e.g. 1a) with an insertion sector (15) with external thread (17) on at least one of its axial ends. These first tubular elements have their external thread in a maximum diameter zone of the connection region (9) with the insertion sector, spaced out from one axial end (13).