Development of the renewal technology for the railway structures

Railways in Japan have developed through extensive construction and improvement since the Meiji Era. Many structures have been constructed during the period; however, repair and reinforcement has become required in an increasing number of cases because the aged structures are increased. In addition, it is also required to cope with new requirements such as countermeasures against earthquakes and improvement in comfortability and convenience, which were not expected at the time of construction. As a measure for the situation, we have developed technologies for extensive renewal of the existing structures. This article introduces those technologies.