| 摘要 |
PROBLEM TO BE SOLVED: To reduce friction with a peripheral ground in the case of the immersion of a caisson. SOLUTION: In a caisson body 1 with a caisson wall body 2 and a caisson cutting edge 7 formed to the lower section of the caisson wall body 2, friction is reduced by forming a large number of projections 6 projected to the ground 4c from the wall surface of the caisson body 1 on the side-section outside 3a and side-section inside 3b of the caisson body 1 and discharging a lubricant among the projections 6 from discharge holes 9.
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