| 摘要 |
PROBLEM TO BE SOLVED: To enhance rigidity without increasing weight of a body part or a water guide part and to reduce vibration and noise when drain collides by forming thickness of the body part so as to be gradually thicker from an upstream side to a downstream side, in a drain pipe having a water collision surface for gradually reducing water flow passing cross section of a body inner peripheral surface toward a stream direction lower side. SOLUTION: A body lower part 2B of a drain collecting pipe 1 is formed into a lower tapered shape. On a passing hole formed on a slab 7 is provided with a lower connection part 10 which is formed into an inserting shape, is fixed by mortar 8 and is connectable with a lower drain rising pipe 9. An upper part and a lower part of the body lower part 2B are made as a cylindrical upper part 2a and a lower tapered part 2b and the inner peripheral surfaces become collision surfaces of drain flowing from an upper drain rising pipe 3 and a side branch pipe 5. On a lower part of the tapered part 2b, a cylindrical upper part 2c is provided and thickness of the tapered part 2b is gradually made thick toward a lower side. On a lower side from a point P where the tapered part 2b is intersected with an inner surface of the same diameter as that of the inner peripheral surface of the cylindrical upper part 2c and extended up to the upper tapered part 2b, space up to the cylindrical upper part 2c is gradually made thin and rigidity of the body lower part 2 is enhanced. As a result, vibration and noise by water collision can be reduced.
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