Aso Ohashi Bridge Area Slope Disaster Reconstruction Project Executed by Unmanned Construction Method Using i-Construction

In 2016, a large section of a slope collapsed in the Aso Ohashi area in the wake of the 2016 Kumamoto Earthquake (main shock). We accepted a project to restore the damaged infrastructure from this huge disaster as quickly as possible. Rapid infrastructure recovery from natural disasters is an important and urgent task as well as an important social issue. Since infrastructure needing to be restored from an unexpected large disaster is very difficult and challenging, it is necessary to adopt a comprehensive approach combining various technical resources. We had already accumulated years of experience in the field of unmanned construction projects to cope with this challenging project, and developed a network-compatible unmanned construction system, never attempted before. With this approach, we reconstructed the collapsed steep slope depending only on remote operation, by making the affected site off-limits to human entry. The project combined 3D models and ICT in all processes including surveys, design, construction, and measurement, and introduced i-Construction, utilizing concurrent engineering, making it possible for us to achieve successfully, safely, and quickly recover from the disaster.