| 摘要 |
The frame has a body bottomed compartments, drip holes made in the bottom walls of the compartments and vertical bores which are provided in the partition walls defining the compartments. The bores are opened at their lower ends and closed openably at their upper ends. The upper ends of the bores are closed openably with a thin film, which is formed integrally with the frame body, or adhesive tapes attached to the upper endds of the partition walls. Concrete or mortar is placed in the compartments and after it has hardened, the upper end portions of the partition walls are cut off slightly or the adhesive tapes attached to the upper ends of th partition walls are removed to open the upper ends of the bores. The water-permeability of the paving slabs is secured by the vertical bores. |
