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Phoogaphy3：提供瀬尾製作所株式会社／Courtesy Seo Inc.｜4：日建設計／Nikken Sekkei ｜1–2：野田東徳［雁光舎］／Harunori Noda [34 tr「Envi-lope」は、「建物を包み込み環境化すること」を意図し、EnvironmentとEnvelopeから生んだ造語です。本開発はその第一弾であり、設計者と外装開発者が別チームで並行して取り組んだことが大きな特徴です。内部からの視界を最大限に確保しつつ、日射を効果的に遮る形を導くため、必要な遮蔽物形状を逆算（逆解析）するシステムを独自に構築し、なべ型のパーツの底面に開ける最適な穴の形を導きました。周りの建物の影響は方位やフロア・部位によって異なるため、外壁の部位ごとに異なる形状が導き出されます。　少ない金属加工で強度高く容易かつ安価に製造でき、日射も効果的に遮蔽できるという理由から、なべ型のパーツの生産技術には共同開発した瀬尾製作所がもつ仏具生産のノウハウを応用し、材料には耐候性が高いZAM® を素地仕上げで用いて、高性能とローコストの両立を図りました。このなべ型のパーツを極細のテンションワイヤーで支持し、風揺れやねじれを制御しながらさまざまな形に追従するファサード面を構成しました。遠方から見るとユニットが宙に浮いて建物を覆うような印象となります。Gankohsha］「ビルを覆う外装」化Phase 04A facade to envelop the building日射遮蔽効果の検証｜Verification of solar shielding results 年間日射負荷Yearly solar radiation load従前（バルコニーあり）Previous building (with balconies)Envi-lopeワイヤーによる支持でやわらかく外壁を覆い心地よい半外部空間を形成Wires hold the facade units in place, gently covering the building’s exterior to create a pleasant semi-outdoor space少ないプレス加工で製造。Production using minimal presswork.輝度分析により木漏れ日の影の特性と似ていることが分かった。Luminance analysis revealed dappled light and shadow characteristic of sunlight filtering through a tree canopy.100%65%低減65% reduction35%Envi-lope01開発：デジタルとものづくりの融合を目指してDeveloping Envi-lope 01: Fusion of Digital Technology and Manufacturing Combining the words “environment” and “envelope,” Envi-lope aims to envelop buildings and make them more environmentally friendly. The project began with the development of the facade, a phase of parallel efforts by designers and developers on different teams. In order to effectively shield against sunlight without cutting off visibility from the building’s interior, we devised a system of inverse analysis for back calculating the optimal aperture for sun shielding to be made at the base of the circular metal units. Since the effects of surrounding buildings vary depending on factors such as orientation, the number of stories, and location, the aperture shapes were modified for units at different places around the exterior wall. In the making of the circular units, we applied the production technology used by our development collaborator, Seo Inc., in the production of Buddhist ritual implements and other metalcraft, as it is simple and affordable, and results in a high-strength product. We were also able to achieve high performance at low cost by using corrosion-resistant ZAM® metal coating for the finish. The parts are held in place by ultrathin tension wire, which controls wind-related swaying or twisting while also allowing for a facade surface that can conform to various configurations. Seen from a distance, they appear to hang in midair as they envelop the building.日本製鉄の登録商標。Registered trademark of Nippon Steel Corporation17