| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method of an underwater foundation capable of transmitting a suction load effectively to a water bottom ground by uniformly carrying out water pumping under a bottom slab part. SOLUTION: A caisson frame body 10 is manufactured on the lower surface side of a bottom slab part 14 in a state of temporarily holding a permeable layer forming material, towed to a construction site of a foundation and immersed in a water bottom ground 26. A skirt part 16 gradually intrudes in the water bottom ground 26, immersion of the caisson frame body 10 proceeds, and when the bottom slab part 14 approaches the water bottom ground 26, temporary holding structure 24 of the permeable layer forming material 22 is released, and the permeable layer forming material 22 is laid. When the instalation is finished, a grout material 28 is charged between a lower surface side of the bottom slab part 14 and a water-barrier sheet 22b. When the grout material 28 is completely finished, water in the skirt part 16 is further discharged through a water pumping passage 18 and a water pumping pipe 20, pressure in the skirt part 16 is lowered, a suction load is generated inside and outside of the skirt part 16, and the caisson frame body 10 is loaded with a preload.
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