Abstract: The invention relates to a drainage collective pipe joint where wastewater flowing in a collective housing of multiple floors is subjected to swirl flow and is allowed to flow down. The drainage collective pipe joint comprises an upper vertical pipe connection port to connect an upper vertical pipe, a main body part having a taper pipe part formed in downward taper shape at lower side and installed at lower side of the upper vertical pipe connection port, a lower vertical pipe connection port installed at lower side of the main body part and capable of connecting a lower vertical pipe, at least one horizontal branch pipe connection port installed at the main body part and connected a horizontal branch pipe, and a plurality of drainage flow control guides projected from an inner circumferential wall at lower side of the horizontal branch pipe connection port of the main body part and capable of controlling the drainage flow.

Abstract: In a housing formed in a drain pipe joint, a lock receiving portion on the near end face, an internal thread portion and a taper portion are formed. Also, in a screw ring, lugs are formed in six locations and a external thread is formed, both around the circumference of the screw ring, a flat face portion is formed perpendicular to the axial direction of the screw ring, and hexagonal sockets and internal threads are formed parallel to the axial direction of the screw ring. Then, the screw ring is secured on the drain pipe joint by fitting a tool such as a spanner to flat face portions formed in the lugs, or by fitting a hexagonal bar spanner or the like to the hexagonal sockets, so that the drain pipe and the drain pipe joint can be connected. Further, stopper screws are screwed onto the internal threads formed in the lugs, whereupon the tips of the stopper screws push the surface of the lock receiving portion formed in the drain pipe joint, securing the drain pipe joint and screw ring.