ロングテーパービーム（スパン約50ｍ、成1.8–0.7ｍ）Long Tapered Beamロングテーパービーム（スパン約50ｍ、成1.8–0.7ｍ）Long Tapered Beam耐震架構（ブレース架構）Braced Frame 耐震架構（ブレース架構）Braced Frame 傾斜トラス梁（スパン約55ｍ）Sloping Truss Beam傾斜トラス梁（スパン約55ｍ）Sloping Truss Beam耐震架構（ブレース架構）Braced Frame耐震架構（ブレース架構）Braced Frame内リングInner Ring内リングInner Ring外リングOuter Ring外リングOuter Ring耐震架構（ブレース架構）Braced Frame耐震架構（ブレース架構）Braced Frame耐震架構（ラーメン架構）Rahmen Frame耐震架構（ラーメン架構）Rahmen FrameN駐車場Parking駐車場Parkingドゥ・スポーツDo Sportsドゥ・スポーツDo Sports旧・新宿住友ホールFormer Shinjuku Sumitomo Hall旧・新宿住友ホールFormer Shinjuku Sumitomo Hall店舗エリアShop area店舗エリアShop areaN駐車場Parking駐車場Parkingドゥ・スポーツDo Sportsドゥ・スポーツDo Sports旧・新宿住友ホールFormer Shinjuku Sumitomo Hall旧・新宿住友ホールFormer Shinjuku Sumitomo Hall店舗エリアShop area店舗エリアShop area超高層ビルの居ながら改修本プロジェクトは、ビルを使いながらガラス大屋根を架ける新築工事と、大規模な既存改修工事を並行して行っています。段階的に建築基準法改正後の条件に適合させていく全体計画認定制度を活用して、ビルのバリューアップ工事および既存遡及工事の長期改修計画を組み立てました。旧38条大臣認定廃止に伴い、制振補強化を含む構造大臣認定取得による適合化、その他、消防法の遡及適用（完了）やエレベータ・エスカレータの耐震改修などを計画的に進めています。Renovating an Occupied High-Rise BuildingThe project was undertaken while the building remained in use, and construction of the glass roof was performed concurrently with major repair work in progress. An overall authorization plan was followed, which allowed for gradu-al conformation to the conditions established by revisions to Building Standard Law. Long-term renovation plans to enhance the building’s value through construction and to continue existing projects were also drawn up. In keeping with the repeal of former Article 38, improvements are being made to obtain government approval. Systematic plans are in place for reinforcing the structural seismic damping of elevators and escalators to improve their seismic resistance and work to achieve compliance with fire prevention laws has been completed.1: 鉄骨造による大屋根（長さ140m×幅90m、高さ25m）の無柱空間。地上部エキスパンションジョイントで既存ビルと構造的に分離し、大屋根を支える柱の位置は、既存躯体を補強しやすく、かつ設備更新などの影響が少ない合理的な箇所を選定した。また、大屋根新築に伴い、長周期地震対応と耐震性の向上のため制振補強を実施。既存の設備バルコニーを利用し、2階に配置した制振ダンバーと3－49階のチューンロッド（制振柱）を連続的につなぐことで建物の動きと連動してエネルギーを吸収する制振システムを採用。ビル外装やオフィス執務空間にまったく影響を与えない、居ながらの制振改修工事を実現した。1 : Column-free space has been created under a huge steel structured roof. Movement joints were used above ground so the roof could be structurally independent. Roof-supporting columns were strategically positioned to reinforce the existing frame and also have minimal e ect on facility renewal and other activity. In addition, with the construction of the roof, seismic retro tting was performed to enable better handling of long-period earthquake ground motion and improve vibration control. Using the existing equipment balconies, inertial rotary damping tubes positioned on the second oor were connected with tuned rods positioned on the third through forty-ninth oors to absorb energy from the building’s motion. e repairs were performed while the building remained occupied, without the slightest disturbance to the exterior or to o ce workspaces. 構造アイソメトリック図｜Structural isometric diagram改修前2階平面図｜2nd oor plan before renovation改修前地下1階平面図1st below-ground oor plan before renovation, scale 1: 3,000082020 AUTUMN44Feature | WORKS
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