| 摘要 |
PROBLEM TO BE SOLVED: To provide a U-ditch made of synthetic resin with high rigidity having bridging members easy to mount. SOLUTION: This U-ditch 1 formed of hard synthetic resin or fiber reinforced resin comprises a U-ditch body forming a wall of U-shaped cross section, formed in corrugated shape by alternately forming recessed parts 5, etc., and projecting parts 6, etc., extending from the wall bottom part 3 of the body 2 to the upper parts of right and left wall side parts 4, 4, continuously in the longitudinal direction of the U-ditch 1; and bridging members 7A horizontally laid and fixed between the right and left wall side parts 4, 4. Bridging member receiving parts 9, etc., that can fit and fix the end parts of the bridging members 7A are formed at the upper parts of the right and left wall side parts 4, 4.
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