| 摘要 |
PURPOSE: The semicircle waterway form is provided to increase durability by filling inner space with cement mortar or lightweight waterproof agent and link each segment one after another without an exact positional arrangement. CONSTITUTION: The semicircle waterway form is composed of: an inner and outer pipe provided with an injection hole(7) and formed in a spiral, also round in a sectional shape; an outer pipe bent toward the inner pipe at regular intervals to form a unified body by a waved support(5) and a connecting point; an access hole(8) overlapped each at a joint, which cement mortar passes through to fill the empty space created by a fixing wall(6) that the outer pipe is bent.
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