ABSTRACT
The road surface of a national highway failed in Japan, due to a landslide caused by typhoons. For the restoration of the road, the installation of steel tubular piles with ground anchors was selected to protect traffic safety in consideration of the possible occurrence of soil mass erosion and loss at the toe of the slope. In this construction project, the quick restoration of one-way alternating traffic was required by installing the piles without delay. Furthermore, installing the piles into the bedrock (bearing stratum) was a technical challenge. To address the requirement and technical issue, the rotary press-in piling (Gyropress Method) and the Non-staging System were selected. This paper aims to review the applicability of press-in piling technology to the pile installation on an active-landslide-slope by reporting the outlines of the disaster rehabilitation work, design of permanent measures, and the construction plan and implementation.
