| 摘要 |
PURPOSE:To maintain drainage function, by a method wherein a drainage pipe having holes is buried in a block body which is produced such that cement, water, porous light aggregate, an organic material, such as shells, chaff, which is eroded by an acid and bacilli in soil, are kneaded and molded. CONSTITUTION:A block body 1 is produced such that cement, water, porous light aggregate, an organic material, such as shells, chaff, which is eroded by an acid and bacilli in soil, are kneaded and molded, and a porous drainage pipe 2 is buried in the body 1 to form a drainage block A. The blocks A are placed in an excavated ditch, a connecting pipe 3 is engaged with and between the drainage pipes 2 of the adjoining blocks A to join together the two blocks A. After cobble-stones 4 are laid on both sides of the block A, the blocks A are covered with organic fertilizer 5 and earth 6. This increases water and air permeability through erosion of the organic material for years, resulting in the possibility to maintain normally constant draining ability. |
