| 摘要 |
PURPOSE: To obtain a cellular concrete block in the shape of a cylinder, the column of a frustum, or the column of double frustums for boring holes for piping in which boring work is easy by containing no reinforcing bars. CONSTITUTION: A cellular concrete block 4 for boring holes for piping is in the shape of a cylinder, the column of a frustum, or the column of double frustums and does not contain any reinforcing bar. The block 4 is arranged in a mold 2, and concrete 5 is placed. After the curing and hardening of the concrete 5, the mold 2 is removed. Then the block 4 is removed by a core drill 6, etc., to form holes for piping, etc. By this, it is possible to form holes of predetermined sizes at predetermined locations easily. |
