| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent an instrument trap from being broken when a catch basin collectively and intensively draining an underfloor drain pipe of a detached house is used. SOLUTION: In the catch basin 4 having an outflow head 11 connecting a main drain pipe 5 and an inlet head 12 connecting each of a plurality of drain branch pipes 6 communicating with the instrument trap except for a toilet, a function reflowing the air in the catch basin and an accumulator function of the air in a pipe passage are imparted to the catch basin 4, the instrument trap is prevented from being broken, furthermore, the downstream of the main drain pipe 5 is connected to an outdoor trap basin 24 to block toilet odor, one upstream instrument trap of the drain branch 6 is eliminated to be used for a vent pipe, and the remaining instrument trap is prevented from being broken.</p> |
