Completed Emergency Restoration Work for Slope Damage between the Numazu and Susono Interchanges (Up Lanes) in the Tomei Expressway
On July 3, 2021, heavy rain in the Kanto and Tokai areas brought damage with a flow of debris in the Izusan area of Atami City, Shizuoka Prefecture, and it also caused mudslide damage with artificial slopes collapsing between the Numazu and Susono Interchanges (up lanes) in the Tomei Expressway. This damage stretched for some 40 m with about 2,000 m3 of soil moving in total. Approximately 600 m3 of earth and sand spilled onto the expressway, blocking traffic in both up lanes.
Kajima's Yokohama Branch received a request from the NEXCO Central, and began emergency restoration work the next day on July 4. We installed large sandbags to prevent debris from flowing onto the down lanes, and we measured the changes in the slopes while removing soil that had fallen and setting up soldier piles and lateral lagging. As a result of these restorative efforts, we unblocked one up lane at 6 PM on July 9. We later installed steel lagging and ground anchors in round-the-clock work. Emergency restoration work was completed at 11 AM on August 27, allowing cars to travel on the second lane as well.
The state of damage on July 3
We unblocked one lane on July 9
We completed emergency restoration work and unblocked the second lane on August 27
According to Project Manager Kengo Kurihara, the key point in operations was that all staff members on-site acted independently with safety based on their own judgment, while engaging in solid communication. Looking back at the construction work, he said: "We were always feeling tense as we worked to unblock the second lane as early as possible while the other lane was in use. It was tough but we did not endure any hardships. With a tight schedule, the NEXCO Central, Kajima, and partner companies all worked as one, offering their own technologies and creative ideas to help restore the expressway swiftly. I will work hard on the full-scale restoration work going forward."
The personnel from Kajima's Yokohama Branch who engaged in restoration work
The slope collapse occurred at the point marked by a cross in this map
