Reinforcement of Kawamata Dam Rock Foundation with Large-Capacity Anchors

Abstract

Kawamata Dam is an arch-type dam with the height of 117m which was completed in 1966 as part of the Kinugawa hydraulic control of the Tone River system. After 50 years since the construction of dam, the requirement for reinforcement of rock foundation and construction of rock foundation PS anchor near the downstream of the dam increases. The installation of a large-scale anchor gantry was implemented in the steep topography during limited annual operation days while maintaining a dam including the discharge running. This study explains the technical features, issues and countermeasures to ensure the drilling quality and tension fixing of the large and long anchors in Japan.