| 摘要 |
PURPOSE:To promote the settlement of a caisson by a method in which a continuous wall is formed of a plastic material, the cutting edge on the side wall lower end of a caisson is set in a matched state, and the ground in the caisson is excavated to settle the caisson. CONSTITUTION:The ground 4 corresponding to the side wall 3 of a caisson 1 is excavated to form a space having a pit or trench-shaped cross section, and columns 11 are formed of a plastic material 10. The second column 12 is then formed along the ground 4 corresponding to the side wall and the columns 11, and the third column 13 is further formed. The cutting edge 20 of the lower end of the side wall 3 of the caisson 1 is set in a matched state on the continuous wall W of the plastic material 10, and the ground 21 inside the caisson 1 is excavated to settle the caisson 1. Since the ground corresponding to the lower cutting edge of the caisson becomes degradable, the excavation can be made easier and the penetrating resistance of the cutting edge of the caisson 1 can be reduced.
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