Study on shield tunnel database on construction data

Shield tunnelling method was used from 1920 in Japan. As the innovation of closed type shield technology around 1970's, the number of shield tunnel constructions in urban area increased rapidly. As a result, more than 4000 shield tunnels have been constructed in Japan and maintenance work for aged shield tunnels increases recently. To carry out the maintenance work efficiently, not only the maintenance data after the completion of shield tunnel construction, but also the construction data are necessary. Therefore, JSCE established the technical committee on shield tunnel database in 2007. At first, the TC carried out the questionnaire survey on the database concerned with shield tunnels to the owners and contractors of shield tunnels to grasp present status. From this questionnaire survey, it was found that the maintenance data are well updated by the owners, but the detail construction data become lost according to time passing. Therefore, the TC focused on the detail construction data and discussed the methodology to establish the shield tunnel database on construction data. This paper presents the overview of the shield tunnel database, based on the interim report by the TC.