| 摘要 |
PROBLEM TO BE SOLVED: To provide a ditch cover, in which there is only one component, which is not welded, in which the correction of distortion and the removal of a temper are not required and which is cut and used in conformity with the size of a prefabricated and installed ditch, and its manufacture. SOLUTION: In the ditch cover, top face sections formed by horizontally extending a plate material, the first vertical sections extending from the end sections of the top face sections to lower sections, underside sections horizontally extending from the lower end sections of the first vertical sections, the second vertical sections extending from the end sections of the underside sections to upper sections, and the top face sections horizontally extending from the upper end sections of the second vertical sections are repeated, and the underside sections are formed of a plurality of connecting sections.
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