| 摘要 |
PROBLEM TO BE SOLVED: To provide a drainage structure that can not only reduce a construction cost of the drainage and but also solve the construction period by making it possible to use such a drainage body that is weaker in strength than usual in spite of its materials and shapes. SOLUTION: The drainage consists of a ditch body 1 having a U-shape in its section, a ditch cover 2, and a pair of right and left ditch frames 3, 3 positioning over the right and left sidewalls 11, 11 and loading the ditch cover 2 whereby the ditch frames 3, 3 support a vertical load without transmitting it to the right and left sidewalls 11, 11 of the ditch body 1.
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