歴史的建造物の重要文化財指定は, 従来木造建築物を中心として推進されてきたが, 最近は明治時代以降に建設された近代建築物にも目が向けられるようになってきた。本稿では, 近代建築物の歩みと文化財登録制度について概観したのち, レンガ造, 石造, 鉄筋コンクリート造などの近代建築物に対する各種補強・補修方法について記述するとともに, いくつかの補強・補修工事の実例を紹介した。

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The roof on the Tokyo Station, with its original form, is one of the most distinctive features on the building and it is the slate that is mostly used on the roof among various kinds of materials. The design of the slate roof, however, has not been analyzed enough, and its tendency of the design and technique also have not been clear enough. This paper is going to clarify the design of the Tokyo Station, based on the usage of slate roof, and also clarify the position of the building among other buildings designed by Kingo Tatsuno and other architects in those days.

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In this study, the flow of action regarding to disassembly and repairing work(DRff) for preservation of historical buildings was made clear by examples. And the chenges of members that compose buildings were indicated clearly by symbolization of the members. The process for works of DRff was divided into 4 steps, and common .elements of each work were sampled. And matrices of 4 process of works and the elements of each work were made. By symbolization and by these matrices, a framework that is able to examine precise building system for preservation by DRff are shown.

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