To provide a reinforcing structure for the existing pier foundation and a reinforcing method for the existing pier foundation capable of simply carrying out reinforcing work for the existing pier foundation.
After a plurality of steel pipe sheet piles 14 have been driven to comparatively shallow positions of the surface layer A so as to surround a caisson foundation 12 formed in an underwater ground G, the caisson foundation 12 and the ground G between the steel pipe sheet piles 14 are excavated to form an excavated space X. First reinforcement 21 projected to the steel pipe sheet piles 14 is driven in the surface of the caisson foundation 12, and after underwater welding of second reinforcement 22 projected to the caisson foundation 12 side has been made to the surface of each steel pipe sheet pile 12, underwater concrete 23 connecting the caisson foundation 12 and the steel pipe sheet piles 14 through the first reinforcement 21 and the second reinforcement 22 is placed. The first reinforcement 21 and the second reinforcement 22 transfer buoyancy among the underwater concrete 23, the caisson foundation 12 and the steel pipe sheet piles 14. At the last, after water inside of the excavated space X has been exhausted, a reinforcing footing 25 is placed to the upper side of the underwater concrete 23 to construct the reinforcing structure.
NOZAWA SETSU
SAKIMOTO JUNJI
MATSUMOTO SHIN
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