Brief description of embodiments of the annular bosses on a pipe of the descent of water, a device for its implementation and pipe obtained.

摘要

The invention relates to a method enabling at least one annular boss to be made on a pipe, characterised in that it consists in inserting the pipe into the die, the exterior surface of the pipe facing the interior surface of the die which has at least one hollow annular relief 15, in introducing into the pipe, facing the die, a radially extensible cylindrical sleeve and in pushing the pipe back against the interior surface of the die with the aid of the said sleeve. It also relates to the device enabling this method to be carried out and the pipes having such an annular boss. IMAGE