| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an underfloor piping structure without causing sealing water breaking of a trap of a water facility by negative pressure as far as a fairly large quantity of waste water does not flow in a drain header from the respective water facilities. <P>SOLUTION: This underfloor piping structure is constituted so that the drain header 2 is arranged under the floor; an upstream side drain pipe 3a, a downstream side drain pipe 3b and a drain branch pipe are connected to a connecting port 2a of its upstream side end part, a connecting port 2b of a downstream end part and a connecting port 2c of a side part; an inside upper space of the drain header and an inside upper space of the downstream side drain pipe are communicated by a bypass ventilation pipe 4; a vortex flow generator 6 for generating a vortex flow is arranged inside a foundation 5 of a building; and the downstream side drain pipe 3b and a foundation penetrating drain pipe 3b are connected. The downstream side drain pipe 3b is kept under atmospheric pressure by the vortex flow generator 6, and even if a drain header vicinal part of the downstream side drain pipe 3b is blocked up by the waste water, the drain header 2, the upstream side drain pipe 3a and the drain branch pipe are kept under the same atmospheric pressure as the downstream side drain pipe 3b by the bypass ventilation pipe 4, to prevent the sealing water breaking of the trap of the water facility by the negative pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
