海上の森・望楼 / Kaisho Forest View tube

2005年1月1日

間伐材の積極的な活用、日本古来の木造技術の継承、敷地周辺の環境保全をテーマに、東京藝術大学北川原研究室と共同で取り組んだ実験的木造建築です。瀬戸市の東・海上の森の入り口、小高い山の頂上に立つこの望楼は、おおたかなど希少種の動植物で注目を集めている周辺の自然環境との共生を徹底的に追求しています。

この海上の森・望楼では、地場産の間伐材（桧）を活用し、壁･床･屋根面すべてに独創的構法「ガラス＋木格子構造」を採用しています。面格子のところどころに嵌め込まれた厚さ12mmのガラスの木への「めり込み作用」が高さ14mの建物に対する地震力を緩和するユニークな構造です。工事中もできるだけ環境に負荷を与えないよう機械を使わず人力による材料運搬と組み立てを試みました。

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In the project of the Kaisho Forest View Tube, there are 3 themes, which are the “Positive practical use of thinning wood “, the “Succession of wooden technology from Japanese ancient times” and the “Environmental preservation around a site”. This project is the experimental wooden structural architecture which was realized in collaboration with Kitagawara studio, in the Tokyo National University of Fine Arts and Music. This architecture built in the east of Seto-city, where is the entrance in the forest of Kaisho, on the top of an slightly elevated mountain. The environment of this site is a model area which attracts attention for the anima ls and plants of a rare kind, and inherits once Satoyama’s figure. This view tube is pursuing symbiosis with such environment thoroughly.

In the Kaisho Forest View Tube, we utilized local thinning woods and a unique “Mengoshi “, hybrid lattice framework of glass and wood for entire walls, floors and roofs. In the unique structure, the compressive strain of 12mm thick glass on the wood alleviates the seismic power for the 14m height building. Our challenge was to exploit the manpower to transport and assembly building materials without machinery in order to reduce the environmental load.

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