| 摘要 |
PROBLEM TO BE SOLVED: To maintain a weight as a foundation by preventing exfoliation of concrete filled inside and a U-shaped groove.SOLUTION: When time-hardened material S such as concrete fills an inside region D formed of a bottom wall 2 and two sidewalls 4, 6, recesses 8, 10 have a function that the time-hardened material S locks the sidewalls 4, 6 in a vertical direction. Therefore, the time-hardened material S does not exfoliate from a U-shaped groove 100, and deviation in the vertical direction (upper direction in Fig.1B) is prevented. |
