Upgrading an Existing Concrete Gravity Dam under Operation

Abstract

The new Katsurazawa Dam construction is a project to raise the Katsurazawa Dam which is the first multipurpose dam in Hokkaido, built about 60 years ago, as a part of the Ikushunbetsu River comprehensive development project, by 11.9 m with the same dam axis. By increasing the dam height by 1.2 times, the total capacity of the reservoir will be 1.6 times, which is an efficient dam redevelopment. Raising dam under operation was done in about two years in Hokkaido, where had to include five months of winter suspension. This paper reports on the results of concrete casting achievement, including the collection of rock and the production of aggregates, and the characteristics of the construction of raised dams.