This paper deals with the restoration of the floor construction of the old Ministry of Justice building, originally completed in 1895. The building was planned according to the metric system of measurement and is one of the earliest examples of a hoop-iron construction for earthquake protection and with vaults of bricks for fire protection, which were developed after the Nobi Earthquake in 1891. Reinforcement works such as iron beams covered with bricks and reinforced concrete were used in the building. This seems to be because the Nobi Earthquake occurred during the course of constrction. The building mainly had single flooring consisting of wood beams placed every about 90 centimeters.
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