As bridges constructed in recent years have become longer and longer, and their construction requires higher precision and more complex process than ever, risk analysis in their construction sites has increasingly become an important issue. Although various risk analysis have been taken in the construction sites of bridges, the number of accidents has not been reduced in recent years, and it is reported that similar accidents have repeatedly been occurring. Its reasons would be shortage of experienced engineers, lack of safety consciousness, and so on. Besides, serious accidents are not caused by a single factor, but by several factors entangled complicatedly. Safety supervisors in construction sites, therefore, are required to find factors of serious accidents, predict the possibility of what events such factors may lead to, and to make a prompt, accurate judgement on whether any serious accident eventually occur or not.

In the present study, we collected the accident cases and built the database of these cases on WWW (World Wide Web). And, we built a knowledge-based system to perform risk analysis systematically to prevent serious accidents in the construction of PC bridges based on the accidents cases. This system was designed for the construction of PC bridges by the erection launching method, which belongs in the precast PC-girder erection method and is associated with a relatively large number of accidents. We scrutinized the erection process, and the machinery and equipment required, by the erection launching method to grasp the characteristics of the method, acquired expertise by interviewing to the experts, extracted various factors of serious accidents, wrought up check items for, and relating among, the accident factors into a hierarchy, and developed the visualized risk analysis system.

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