Modern technology is too much complicated for the general public to accept and to commit easily. The research and development of intelligent materials are needed to construct technological systems of more simplified and of brevity. The author proposes a concept of “Ken-Materials” which are further proceeded from intelligent materials. Ken (wisdom) means that materials themselves possess intelligent autonomy such as self-diagnosis. In this paper applications of Ken-materials to concrete materials are introduced. In order to give structural materials both strength and self-diagnosis mechanisms, the materials for reinforcements must be of high modulus and of enough electrical conductivity. Carbon fibers, short or long, are effective for such reinforcements.

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The Route between Toyota JCT and Yokkaichi JCT of the second Tomei and Meishin expressway, that is being planned at the present, has necessity to be as one with the present Tomei and Meishin expressway. While this route is desired to be arranged early, it needs huge cost. So we have problems of the reduction of cost, saving of works, and shortening of working days, by introducing new methods and new technologies. In order to solve these problems at JH Nagoya construction bureau, we are grappling with bridges of the second Tomei and Meishin expressway. At this report, we will explain grappling with PC-bridges, showing the policy which we have, and the examples.

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The cross section aria of the large tunnel on the New Tomei-Meishin Expressway is approximately 190 square meters as well as flatten arch shape (ratio of flatten : 0.65). There are no road tunnels with such large cross section except these bases of petrol stocks or under ground power plants in Japan. Prior to large scale project which will be start on the New Tomei-Meishin Expressway, three demonstration fields have been launched by Japan Highway Public Corporation in order to prove various unknown problems which are to establish most reasonable tunnel cross section, to find the problems of design of temporary steel ribs on tunnel, TBM method and new material (high strength concrete, high strength metal support, long length cable bolt and so on) as well as to examine saving labor on the tunnel project. I would like to introduce contents of the large tunnel experimental projects on this report.

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