Siphon guttation system

摘要

P To provide a siphon drainage system capable of improving the drainage performance in a joint part where a plurality of vertical pipes join mutually and draining the water collected ON a floor slab. PSOLUTION: A VENT passage 37 allows a fluid flowing from an outer side toward an inner side of the VENT passage 37 to flow in by a membrane valve 80. Consequently, when pressure in a storage pipe 30 becomes negative pressure for the atmosphere and the membrane valve 80 is opened to allow air to flow into the storage pipe 30, thereby improving the drainage property in the storage pipe 30. Since a VENT passage forming member 32 is opened upward above the floor slab 14, the water collected ON the floor slab 14 can be drained through the opening. PCOPYRIGHT: (C)2010 and JPO& INPIT