| 摘要 |
According to the present invention, provided is a box-shaped underdrain including a pair of wall bodies (100) including a side plate (110) placed vertically on the ground and a lower extended part (120) extended from a lower part of the side plate (110) in a horizontal direction but facing each other in a direction to which the lower extended part (120) is extended; an upper slab (200) placed in a placement part (130) having both ends formed in the upper part of the wall bodies (100); an upper corner part (300) combined with the upper part of the wall bodies (100) and both ends of the upper slab (200); and a lower slab (400) having both ends combined with the lower extended part (120) of the wall bodies (100) and a building method thereof. A pair of the wall bodies (100) and the upper slab (200) are manufactured with a precast method, and the upper corner part (300) and the lower slab are manufactured with a cast-in-place method. |
