Nobuko Nakahara is one of the prominent architects who led the postwar housing design and established Hayashi-Yamada-Nakahara, Architects and Preservation in 1958. In this paper, it is aimed at comprehensively clarifying the design process and the background of “Chogakuin temple (1962)” with the HP shell roof which was completed just 4 years after her office was founded. She entered the Ikebe Laboratory of the Institute of Industrial Science, The University of Tokyo as a technical research student, and in the midst of the Controversies on Japanese tradition that involved Kiyoshi Ikebe, she was in charge of designing works “Number 20” and “Number 28.” In addition, the Ikebe Laboratory was actively working on a shell structure which was a new technology at that time. And, Nakahara closely related herself to “Numazu City Public Hall(1953)” designed by Ikebe Laboratory, and became close to Hoji Nukushina who was indirectly involved in structural design and Takumi Orimoto, a structural designer of “Number 38 (1958)”. Buildings adopting HP shell in Japan were built from around 1952. The number of shingles of the HP shell accounts for mostly one which constitutes one unit by one sheet and one which constitutes one unit by four sheets. As a new construction of reinforced concrete construction, “Chogakuin temple” is a work that Nobuko Nakahara first worked on after the establishment of the office and was published in a magazine titled “Integration of HP Shell and Tradition.” Chief priest and Parishioners wanted a warm and soft atmosphere. Therefore, Nakahara responded to the demand by adopting "Disconnected HP shell, " for example, by curving the edge beam of the shell. At the time, there were no roofs of exactly the same shape as this. The roof of the main “Chogakuin temple” is a combination of 4 HP shells, and its roof is supported by 4 pillars. The beams and pillars have an equilateral triangular cross-sectional shape, and they handle rainwater with grooves in them. Works that used “Disconnected HP shell” in times when structural expressionism is popular, “Chogakuin temple” is the only example, other than the saddle shell.
The reason why Nobuko Nakahara was able to complete the design of “Chogakuin temple” to integrate HP shell and the Japanese tradition in 1962, the following could be noted.
1. She learned about modern architectural thinking from Kiyoshi Ikebe so she could understand Japanese traditional design and structural expressionism.
2. She experienced the Controversies on Japanese tradition in Ikebe Laboratory and others, and established a basic way of thinking against this problem. She accepted positively the desire of Chief priest and Parishioners while designing this temple.
3. In the Ikebe Laboratory which was motivated to apply the new technology, she learned about HP shell, gained network with structural designer Hoji Nukushina and others, and completed the “Chogakuin temple” design under the support of them.
The way of thinking of Kiyoshi Ikebe about tradition simply did not adopt the Japanese element as it was. On the Contrary, it was going beyond tradition using new materials, construction methods, and techniques. As a disciple of Kiyoshi Ikebe, Nobuko Nakahara followed his idea with the cooperation of others and applied them to “Chogakuin temple” in its realization.
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