To provide a highly executable construction process without using sheet piles.
Only one stage of a corrugated pipe 18a is constructed by connecting multiple circular arc corrugated sheets in a circumferential direction on a barge placed next to a bridge pier, the next one stage of a corrugated pipe 18b is composed while the corrugated pipe 18a is suspended by a crane, and both corrugated pies 18a, 18b are joined. By following this process repeatedly, six stages of corrugated pipes, for instance are formed. A partial double cylinder structure 22 is formed by forming one stage of an external corrugated pie 20 as if to surround the bottommost stage 18f and connecting 18 and 20 by a connecting member 21. The partial double-cylinder structure 22 on the barge is lowered and placed on a foundation, and an underwater concrete 24 is driven between the inner corrugated pipes 18 and the outer corrugated pipe 20. After the concrete sets, draining is performed for the inner corrugated pipes 18.
INOUE MASAOMI
OKAMOTO KOUSUKE
DAIKEN KK