| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method of an underwater foundation of which center-of-gravity position can be adjusted so that it becomes a stable floating body while being towed, without unnecessarily increasing the weight of a sidewall and a floor slab of the underwater foundation, and an outer shell section structure. SOLUTION: A plurality of outer shell members 7 are continuously arranged along a top face 25 of a side wall 5 provided around the bottom slab 3 of a caisson 1, and the outer shell members 7 and the side wall 5 are fixed by a PC steel 11 to install an outer shell section structure 14. The caisson 1 with the outer shell section structure 14 installed is moved to water surface and arranged by putting a weight body 39 such as seawater, sand or ballast into the inside 37 thereof, to adjust the center-of-gravity position of the caisson 1. Thereafter, the caisson 1 is towed up to a position above an installation planned position and filling sand 45 is put into the inside thereof to immerge the caisson 1 at the installation planned position and place upper floor concrete 47. Thereafter, water is poured into the inside 49 of the caisson 1 and tensioning force of the PC steel 11 is released to remove outer shell members 7 from the top face 25 of the side wall 5, and then the PC steel 11 projecting from the side wall 5 is cut off. COPYRIGHT: (C)2012,JPO&INPIT |
