Cleaning shaft for waste water underground pipes - has cover with conforming curve ensuring full bore on closing

摘要

The cleaning shaft for waste water underground pipes has a cover conforming to the pipe profile. The cover is held and sealed on pipe with uniformly distributed bolts around the shaft cover. The shaft wall is not deformed under internal pressure and no stagnant pockets are formed at the shaft. The cover (1) has a curved shape matching the removed pipe wall. The cover is guided by a shaft's vertical wall surface and cover's vertical side walls (7). The cover is placed into its seat and full bore is restored in the pipe. The cover is clamped by bolts (20) which cannot be lost for the bolts have heads (19) larger than bolt dia. and transverse pins (16) at lower end.