Maintaining drainage in waste water lines during repairs involves sucking out waste water from waste water line via above ground end of auxiliary line during repair work in main channel

摘要

The method involves accurately introducing an auxiliary line (12) into the waste water line (6) from the surface, sealing the transition point (14) between the auxiliary and waste water line and blocking the waste water line between the opening of the waste water line into the main channel (1) and the transition point. The waste water from the waste water line is then sucked out via the above ground end of the auxiliary line during repair work in the main channel.