Abstract
Planning the renewal and repair of aging bridges is a pressing issue for road managers in Japan. The refurbishment of old structures in urban expressways is fraught with difficulties due to their constant use and central location within Tokyo metropolitan area. Currently, a long-term bridge replacement project is being executed in Tokyo by Metropolitan Expressway Co., Ltd. As part of this project, the Daishi Bridge expressway, which was opened in 1967 in southern Tokyo, was renewed in 2015 owing to multiple fatigue cracks throughout its superstructure. The damaged, aging bridge was taken apart and a new bridge spanning 292 m and weighing approximately 4,500 tons (including attachments) was erected over a short period of merely two weeks. The expressway, which supports heavy traffic, was temporarily closed during this period. Various measures were devised and implemented to complete the renewal project as quickly as possible, while accounting for special construction conditions for bridges over rivers. This report provides additional details of this renovation project.
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