DESIGNWORKS Vol.07

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2,3809207401,007.5127.54658001603,3002,5001234事務室OfficeKDX博多南ビル改修KDX Hakata Minami Buildingオーバーレイされた傾斜窓Overlaid sloping window築35年の事務所ビルの全面改修である。ここで働く人たちの執務環境を改修中も維持するため、既存の開口は触らない-大きくもしないし小さくもしない-ことを前提に、改修ならではの価値を見出すことをテーマとした。その 結果、単窓がならぶ既存の平坦な壁面に、新たに水平線を立体的に書き加える、というただひとつの操作を行った。この立体的に構成される水平線は外観を刷新するだけでなく、窓際の空間と視野を拡げたり、効率の良い換気および排煙の経路を構築するなど、室内環境の向上にも寄与している。改修には多くの制約が伴うが、 完成時に求められるものは新築と変わらない。今回は新築にない新しさを求め、少ない操作で最大の効果を得ようと試みた。古きものに新しきものをオーバーレイするのは、改修だから こそ可能な表現であった。(川建 康)建築主:有限会社シスタン・キャピタル事業主:ケネディクス株式会社所在地:福岡県福岡市主要用途:事務所設計施工:竹中工務店・設計:大坪昌裕・川建康・構造:大塚真裕・賀來正義・清永敏弘・設備:小川洋充・渡邊博史・作業所長:星原孝一敷地面積:1,826.25㎡建築面積:1,643.38㎡延床面積:13,511.13㎡構造:SRC造・RC造階数:地下1階 地上9階 塔屋2階工期:2007.3〜2008.1Owner: Y.K. Cistern CapitalCommissioning entity: Kenedix, Inc.Location: Fukuoka-shi, FukuokaMain use: OfficeDesign and construction work: Takenaka Corporation･Architects: Masahiro Ohtsubo, Yasushi Kawatate･Structual: Motohiro Ohtsuka, Masayoshi Kakuand Toshihiro Kiyonaga･M&E: Hiromitsu Ogawa, Hirofumi Watanabe･Site manager: Kouichi HoshiharaSite area: 1,826.25㎡Building area: 1,643.38㎡Total floor area: 13,511.13㎡Construction: Mixed steel reinforced concrete and reinforced concreteNumber of stories: 9 floors above ground plus 1 basement floorConstruction term: March 2007 to January 20081. 室内上部での自然換気による室内環境保持 Maintenance of the interior environment by natural ventilation at the interior top2. 窓際のスペース拡幅 Wide space by the window3. 中間期における自然換気 Natural ventilation at intermediate periods4. 直射光を効果的にカットする2枚の庇と傾斜窓 Two overhangs and sloping windows to effectively cut out direct light<古きもの>に<新しきもの>がオーバーレイされる壁面 22This was a total reconstruction of a 35-year old office building. In order to maintain the working environment of the people working there during the reconstruction and to realize the value of the renewal, it was a requirement that the existing openings not be touched – neither made larger nor made smaller. As a result, new horizontal lines were added 3-dimensionally to the plane wall surface on which the single windows were aligned, and this was the only operation that was carried out. These 3-dimensional horizontal lines not only renewed the external appearance, but also broadened the window side spaces and field of view, formed efficient ventilation and smoke discharge paths, etc., contributing to the improvement of the internal environment. There were many restrictions on the reconstruction, but the requirements on completion were no different from those for a new building. In this case a newness that was not there when the building was newly built was required, and the aim was to obtain the maximum effect from few operations. Renewal is overlaying something new onto something old, and so new expressions are possible. (Yasushi Kawatate)DETAIL SECTION S=1:6024Works