| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved U-shaped channel block allowing smooth transmition of load to its side walls when a vehicle or the like runs on a lid plate, while preventing shaking of a lid plate, and allowing easy construction work to enable an accurate channel construction, and capable of securing a wide area for a flow passage and to provide a forming mold therefor. SOLUTION: In a U-shaped channel block 1, the outer surface 7 of each side wall 2, 2 from its upper side to its lower side is formed as one even vertical plane, and stepped faces 9 serving as lid locks are formed as inwardly and downwardly tilted planar or curved faces. A downwardly diverging flow-passage- enlarging tilted face 13 crossing each stepped face 9 at right or greater angles is formed on the inner surface of each side wall below the stepped face 9. Therefore, load from a lid plate is smoothly transmitted to the U-shaped channel block 1 without causing large local bending stress on the side wall 2. Since each stepped face 9 is formed to project inside of the side wall 2, problems regarding strength do not arise even if no outer flange is formed at the upper side of each side wall, and the outer surface of each side wall can be formed as one plane.
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