Series of parallel steps fixing method for internal wall of manhole of roadway system, involves closing mold, so that inserts fixed on half-shell are introduced into end of bar, and manufacturing manhole of roadway system by molding

摘要

The method involves fixing an end of a hollow metal bar forming a step on a rod (10) of mounting inserts that are fixed on a half-shell (5-1) of a rotor-molding mold (5), where inner diameter of the bar corresponds to outer diameter of the inserts. Length (l) of the bar corresponds to distance separating positioning plates (7) from bosses (6-1, 6-2). The mold is closed, so that the inserts fixed on another half-shell (5-2) are introduced into another end of the bar. A manhole of a roadway system is manufactured by rotational molding.