| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method of a cofferdam structure capable of resisting buoyancy that acts during construction without inviting a failure.SOLUTION: The construction method includes execution of: a first step of abutting an opening 21 provided on a cofferdam structure 100 in a dome body shape to be used when constructing a through-hole in an existing dam body 1 to a dam body upstream surface 3 so as to surround an opening scheduled position 4a of a through-hole 2; and a second step of making a plurality of anchors 60 pass through at an interval so as to surround the periphery of the opening 21 and placing them on the dam body upstream surface 3 so that the through-hole 2 is not affected by a load acting on the anchors 60, in a skirt part 32 for which a peripheral edge of the opening 21 is extended along the dam body upstream surface 3, and which is extended so that the pass-through position of the anchors 60 made to pass through the skirt part 32 and placed to the dam body upstream surface 3 is separated outwards from the opening 21. |
