| 摘要 |
<p>An irrigation and/or drainage assembly is provided, comprising a box body with a base wall provided with perforations and body side walls provided with perforations extending perpendicularly and integrally connected to said base wall. A separate box cover comprises a top wall provided with perforations and cover side walls extending perpendicularly and integrally connected to said top wall. The box body is provided with a number of body columns extending upwardly from its base wall and having a top end extending above the body side walls and forming coupling members, wherein the base wall at its lower side is provided with a number of body recesses which are positioned such that, when two box bodies are positioned one on top of the other, the coupling members of the lower of those two box bodies are receivable within the body recesses of the upper of those two box bodies. The box cover is provided with a number of cover columns extending downwardly from its top wall and having a lower end defining cover recesses which are positioned such that, when a box body and a box cover are positioned one on top of the other, the coupling members of the box body are receivable within the cover recesses of the box cover.</p> |
