| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily clean a waterway part while projecting one line of L shape steel for supporting a catchment surface of a curbstone part. SOLUTION: This drainage ditch unit 1 also serving as a steel curbstone having the curbstone part 2 having a tire support surface 2a and the catchment surface 2b and the waterway part 3 as a drainage ditch, is characterized by fixing a reinforcing and receiving part 5 supported by a front side inside bottom surface of the waterway part 3 to an under surface of the catchment surface 2b of the curbstone part 2.
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