THE DRAINAGE SYSTEM OF THE PBD PUBLIC LAW WHICH HAS THE CORE OF A XI UNIFICATION FORM

摘要

A drain board of a PBD method of construction is provided to have excellent water conveying capacity by preventing a drainageway from being clogged. A drain board of a PBD method of construction comprises a core(20) forming a drainageway and discharging underground pore water to the ground, and a filter(30) covering the core and preventing the inflow of impurities to the inside of the drainageway, wherein the core comprises a first diagonal member(21) formed to be inclined in one direction, a second diagonal member(22) having a symmetrical structure to the first diagonal member, and a vertical member(23) formed between the first diagonal members, the second diagonal member and the next first diagonal member, and the second diagonal members to prevent the filter from being adhered closely to the drainageway.