| 摘要 |
PROBLEM TO BE SOLVED: To provide a confluent section structure which can prevent inflow of water from a confluent section with a drain down pipe to a vent pipe. SOLUTION: According to the confluent section structure, down pipe joint portions 41A to which down pipe terminal portions 26A are connected, respectively, are arranged in an upper portion of a down pipe collective joint 41. The down pipe joint portions 41A allow the down pipe terminal portions 26A of a plurality of down pipes 26 to be connected thereto, respectively. The down pipe collective joint 41 has a projection 41D formed on an upper surface where the down pipe joint portions 41A are formed, in a manner projecting further upward from the upper surface, and a vent pipe joint portion 41B to which a vent pipe terminal portion 30A is connected, is formed in an upper surface of the projection 41D. Further the vent pipe terminal portion 30A of the vent pipe 30 is connected to the vent pipe joint portion 41B. Therefore the vent pipe terminal portion 30A is arranged at a location higher than that of the down pipe terminal portion 26A. COPYRIGHT: (C)2008,JPO&INPIT
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