| 摘要 |
A drain plate is provided to allow the drain pipe to maintain the flatness without being inclined by accommodating an obstacle in a cup when the obstacle protrudes from a surface of a base layer. In a drain plate, a drain passage is formed between a plurality of cups(20) by laying the drain pipe having the cups on a base layer. A cutting line guiding a bottom plate to be separated from the cups by a strike is formed on the bottom plate formed at the upper ends of the cups. A cover(30) covers opened upper portions of the cups. The flatness of the drain plate is maintained by removing the bottom plate and introducing an obstacle into the interior of one of the cups when the obstacle protrudes from the base layer. The cover covers the opened upper portion of the cup from which the bottom plate is removed so that the concrete installed at an upper portion of the drain plate cannot be discharged to a discharge passage. A plurality of inner bosses(23) and catching protrusions(24) are radially formed on the inner peripheral surface of the upper side of the cup. An outer boss(31) is formed at the lower end of the outer peripheral surface of the cover so as not to be separated by the bosses if the cover is engaged with the cup. |
