Patent ID: 6425217
Filing Date: 2002-07-30
Classification: E03C

Abstract:
A building drainage system comprising:a drainage stack passing through stories in the vertical direction; appliance drainage pipes connected to water-service terminal appliance on each of said stories, each of said appliance drainage pipes including a transversely extending portion and a downwardly extending portion; and a combined joint for connecting said appliance drainage pipes provided on each of said stories to said drainage stack; wherein said combined joint for connecting said appliance drainage pipes provided on each of said stories to said drainage stack is at a level lower than that of a floor slab of said story, to sufficiently give a vertical velocity component to a fluid flowing in each of said appliance drainage pipes, thereby combining said fluid to a fluid flowing in said drainage stack, and said combined joint is disposed at a level lower than that of said transversely extending portion of said appliance drain pipe by a specific distance.