Provisional deadline structure of the dam body

摘要

PROBLEM TO BE SOLVED: To provide a cofferdam structure that can be constructed using a crane smaller than that in the prior art.;SOLUTION: A dome-shaped cofferdam structure 100 to be used in through-hole construction in an existing dam body 1 is divided into plural parts 30 which are separable from each other, and the parts 30 are water-tightly connected together via a water cut-off material 35 to form the cofferdam structure 100.;COPYRIGHT: (C)2013,JPO&INPIT