| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete product such as a side ditch and a stair block in which specified strength can be obtained while surface heat generation bodies are embedded. SOLUTION: Reinforcement bars 3 disposed on the upper surface side of a surface heat generation body 2 provide a stair surface part 1a with specified strength. Strength in a thickness direction of the stair surface part 1a is also increased by leg rod parts 3c, and concrete parted to the upper surface side and lower surface side of the surface heat generation body 2 is connected and integrated to each other by the leg rods 3c. Concrete is filled in each hole 5 in the surface heat generation body 2 to connect and integrate concrete parted to the upper surface side and lower surface side of the surface heat generation body 2, and the leg rod 3c is inserted in each hole 5, so the leg rods 3c, reinforcement bars 3, the concrete, and the surface heat generation body 2 are strongly integrated, thereby strength of a product is largely increased by cooperation with strength maintaining effect of the reinforcement bars 3 and the leg rods 3c. |
