PAPERS OF THE RESEARCH MEETING ON THE CIVIL ENGINEERING HISTORY IN JAPAN

In this second report, various truss girders of the British school of design constructed in Meiji era (1868-1912) other than 200ft double Warren trusses are described.
Iron and steel truss girders are classified into 13 types by their skeleton diagrams. Nine of those are pin-connected types and the rest are riveted ones. Only a few girders are still in service their original sites though most girders have already been removed. In April 1986, 39 girders (excluding 200ft double Warren trusses) are still in service.

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Focusing on the group of bridges constructed by the Reconstruction Bureau after the Kanto Earthquake Disaster in 1923, their structural forms and process of construction were investigated. Considering the temporal and areal distribution of the bridges constructed successively, several historical factors underlying these works were discussed.

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First derrick car called SO-1 type was designed for bridge erection by Japanese Government Railways, and 6 units of them had been built from 1920 to 1927. This derrick car was capable of erecting up to 70ft span and 28ton weight class plate girder bridge. Though based on the past similer idea, the car was an original one for railway use, and it contributed very much to construction of railway network at that time. This erection method was characterized in that it made the bridge erection safer, faster and more economical than the former staging erection. But it retired about 1960', because a new bridge erection has been developed thereafter, and a new derrick car SO-200 type appeared in 1960. This paper discribes a history of the first derrick car for bridge erection.

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A history of the Kakehashi river water system in Komatsu Ishikawa Japan has been reviewed. It is found that the ecological system has changed dramatically after the completion of the short-cut construction between Shimomaki and Tsurugashima in 1923: The Kakehashi river was in perfect harmony with all the creatures including human beings before the construction, but the favourable interaction was restricted after the construction to some extent. The degree of the restriction had increased with the subsequent constructions for the channel arrangement and embankment completed in 1936 and 1943 respectively.
The present review has clearly revealed that the ecological system is still well preserved and attractive. It is particularly desirable that the future ecological system of the Kakehashi river as well as the new countermeasure against the flood are developed on the basis of the global view in order to preserve the ample nature and excellent culture in Kamotsu.

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