The present study outlines the advantages of using trenchless methods for the rehabilitation of pipelines made of steel, concrete, cast iron etc. The trenchless technologies have been widely applied for the rehabilitation of various pipelines such as sewage systems, gas pipelines or water supply systems. They are known as the swagelining technology which is based on one of the metal working technologies and namely the sinking of pipes. The PE pipe stress in the drawing die zone has been analysed and an attempt has been made to analyse the mechanisms causing the elastic recovery of PE pipes. The examinations show that the lower the series number of the pipe pulled in and thus the thicker the pipe wall, the higher the drawing force has to be. This results from the resistance the pipe drawn must overcome in the die zone. The elastic recovery varies according to the die angle and the reduction ratio. The elastic recovery increases as the die angle and the reduction ratio increase. The thicker the wall the more intense is the recovery. The most intense elastic recovery of the pipe tested takes place during the initial 30 min after the completion of the drawing test. Quantitative characteristics of the process will be used in the procedures of selecting tools and materials for individual reconstructions.


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