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Phoogaphy｜p.22提供国立西洋美術館／Courtesy Na12ttr WAtirtonal Museum of estern Feaure | PERSPECTIVES1 :改修後の前庭。2 : 改修前の前庭。0550154国立西洋美術館／名勝無鄰菴庭園／龍谷大学大宮学舎National Museum of Western Art/Murin-an Garden/Ryukoku University, Omiya Campus歴史的建造物の保存・活用にあたっては、建物本来の魅力を維持し、将来までその魅力が持続できるように、日建設計が培ったさまざまな設計技術を活かしています。　現代の設計や計画、最先端の解析技術、インフラと建築を総合した改修マスタープラン計画の技術（24–25ページに関連記事）の活用によって、歴史的建造物にサスティナブルな魅力を創出します。　本号では、その技術要素の一例をご紹介します。22ル・コルビュジエにより設計され、世界文化遺産に登録されている国立西洋美術館の前庭の整備を行い、2022年に竣工しました。創建時とは異なる姿となっていた前庭を、創建時に近い姿に戻すため当時の図面や記録資料を確認し、残されていない仕様や寸法はさまざまな検証を重ねて適切な回答を導き出しながら整備図をまとめています。前庭の下には企画展示室があり、その防水更新も兼ねていたため、床石目地用の特別なディテールもつくり出し、ル・コルビュジエが描いた当時の前庭の姿を再現することで、世界文化遺産の継承と価値の向上を実現しています。亀裂誘発目地砂埋め込みSand embedded control jointシール目地Sealant成形伸縮目地Expansion joint103025石目地｜Stone joint石固定金物Stone joint fixing - offset channel extrusion砂利植コンクリート舗装Exposed aggregate paving押えコンクリートProtective concrete topping断熱材Insulation layer防水層Waterproof membraneNikken Sekkei’s maintenance and con-servation work on the front courtyard of the National Museum of Western Art (Ueno, Tokyo) was completed in 2022. The building, which has been inscribed on the UNESCO World Heritage list, was designed by Le Corbusier. The courtyard was made to more closely resemble Le Corbusier’s orig-inal design. The planning involved exam-ination of original blueprints and archival records, along with repeated verification testing when original specifications and dimensions were unavailable. As we were also renewing the waterproofing for the spe-cial exhibition area situated in the basement below the courtyard, we developed special detailing for the joints in the exposed aggre-gate courtyard paving. By returning the courtyard to Le Corbusier’s original design, we were able to sustain the integrity of a building that is a UNESCO-listed World Heritage Site and increase its value.In preserving and utilizing buildings of historical significance, Nikken Sekkei employs a range of design techniques we have developed to ensure that the character and qualities of the orig-inal structures are maintained and will endure into the future. Lasting aesthetic value is generated through modern design techniques and planning, state-of-the-art analytic methods, and repair master-planning techniques that integrate infra-structure and architecture. (See related article on pp. 24–25)1 : Courtyard after conservation.2 : Courtyard before conservation.石目地と亀裂誘発目地を一体にした企画展示室 上部スラブのディテール。Stone incorporated control joints are integrated into the paving details above the special exhibition area upper slab.Restoring Le Corbusier’s Details国立西洋美術館の改修 National Museum of Western Art Conservation Project1 ル・コルビュジエのディテールを再現する活かされる設計技術Design Techniques for Preserving History