| 摘要 |
PURPOSE: A drain trap and a layered drainage system are provided to prevent noise generated in a drain pipe and a sewer pipe from being transferred to a lower layer. CONSTITUTION: A drain trap(1) comprises a main body(11), a trench(13), a backflow prevention unit(14), and a cover(12). The main body is installed on a concrete slab and has a drain outlet(111) and one or more discharge ports(113). The trench is detachably installed in the drain outlet and has multiple holes(131). The backflow prevention unit is installed inside the main body and prevents sewage flowing through the discharge ports of the main body from flowing backward to the drain outlet. The cover is inserted into a guide(112) of the main body and is slid in a longitudinal direction. |
