感谢来自 小大建筑设计事务所 对gooood的分享。更多关于他们： kooo architects on gooood
Appreciation towards kooo architects for providing the following description:

01
城市缝隙中的设计
Design brief

项目位于东京日本桥，周围被东京典型的杂居大楼包围。场地没有像景胜地那样的远景视野，且周边建筑在高度、宽度、材质以及开口形式上缺乏统一的设计逻辑。

The project is located in Nihonbashi, Tokyo, surrounded by typical mixed residential buildings in Tokyo. The site does not have a long-range view, and the surrounding buildings lack a unified design logic in terms of height, width, material and opening form.

▼街道主立面，Main Street Elevation © Keishin Horikoshi

为了打破“都心狭小用地”这一负面因素，我们关注城市建筑之间的缝隙，并以视线的穿透性为设计主题。在这块仅有 84 ㎡的狭小用地上，我们需在有限的空间内打造14间客房。

On a limited 84-square-meter plot in Tokyo’s central district, Kooo Architects focused on the “gaps” within the urban fabric to design Hotel Rakuragu—a 9-story hotel with open views despite its compact site.

▼立面局部，Elevation Detail © Keishin Horikoshi

02
空间策略
Strategy

阳台｜Terrace

该地区周围大多是典型的东京市中心杂居建筑，没有像风景名胜区那样的远景，而且该地区周围的建筑物在高度、宽度、材料或开口方面没有统一的设计规范。在东京的典型城市酒店中，为了最大限度地利用客房空间，通常不会特意设计阳台。客房内，用机械设备营造出稳定的环境。

The area is surrounded by typical mixed-use buildings in downtown Tokyo, lacking scenic vistas or uniform design regulations for neighboring structures in height, width, or materials. Unlike typical Tokyo hotels that omit balconies to maximize room space, Kooo Architects observed the surrounding buildings and oriented each floor’s openings toward urban gaps, creating balconies in varying directions.

▼整体街道视角，Overall Street View © Keishin Horikoshi

通过观察周围建筑，即使在这个建筑密集的地区，我们也能够找到每个楼层可以轻松地向外开放的方向。每间客房均设有朝向不同方向的阳台，使客人可以从每层楼的每个房间欣赏到不同的景色。最终，Hotel Rakuragu呈现出看起来像是从垂直建筑中随机雕刻出来的独特的外观。

Each room features a unique balcony design, allowing guests to experience diverse views from different floors. This approach resulted in a building that appears as a white cuboid carved with irregular voids, forming a rhythmic façade.

▼整体立面，Overall Elevation © Keishin Horikoshi

▼局部，Detail © Keishin Horikoshi

▼局部立面，Partial Elevation © Keishin Horikoshi

平面轴网X1-X4上下贯通，形成框架，保证建筑的经济性。在高效满足酒店客房数量限制的同时，最终通过修改各层末端单跨的结构（平面轴号X4-X5），实现了三种不同的阳台样式，为建筑立面创造了独特的表达。

The plan grid (X1-X4) was vertically connected to optimize cost efficiency. By modifying the single-span structure at the X4-X5 axis, three distinct balcony styles were achieved, balancing functional needs with architectural expression.

▼入口街道视角，Entrance Street View © Keishin Horikoshi

▼入口灯光效果，Entrance Lighting Effect © Keishin Horikoshi

▼入口，Entrance © Keishin Horikoshi

Hotel Rakuragu特意将空间分配给室外空间，通过打造阳台，您可以感受到自然的风和光，并且它具有允许自然通风的被动设计。开口采用 Low-E 玻璃，即使是给人以开放感的大开口，也可以通过缓解夏季的炎热和提高冬季的供暖效率来改善室内舒适度。这家在冠状病毒大流行期间设计规划的酒店，可以让您同时感受到的室内有质感的墙壁和外部环境的光线。

The terrace integrate passive design principles, enabling natural ventilation and light through Low-E glass. This balances openness with thermal comfort, mitigating summer heat and improving winter heating efficiency—a critical consideration during the COVID-19 pandemic design phase.

▼外观俯视，Overhead Exterior View © Keishin Horikoshi

▼阳台三种类型，Three Types of Balconies © Keishin Horikoshi

▼阳台特写，Balcony Close-up © Keishin Horikoshi

结构｜Structure

该建筑的一大特色是其结构形式，其外部形状看上去就像是一个被雕刻出来的白色长方体。阳台上没有柱子，以免遮挡客人的外部视野。

▼结构分析1 刚架结构，Structural Analysis 1 Rigid-Frame Structure © 小大建筑设计事务所

The building’s iconic form uses a steel rigid-frame structure with diagonal braces instead of conventional column-and-beam systems. This allows flexible column placement and minimizes visual obstructions on balconies.

▼日景整体鸟瞰，Aerial Daytime View © Keishin Horikoshi

▼日景整体，Overall Daytime View © Keishin Horikoshi

立面富有韵律感，每层楼左右两侧的阳台有些雕刻成三角形，有些阳台则覆盖整个开间。为了实现这种形状，我们选择了带斜撑的刚性框架结构，而不是典型的带柱和梁的刚性框架结构。这使我们能够在一定程度上自由地排列柱子以适应平面，从而使我们能够创造这样的空间。

▼结构分析2 结构(1-5-9F)，Structural Analysis 2 Structure (1-5-9F) © 小大建筑设计事务所

The facade has a rhythmic design, with balconies on both the left and right sides of each floor. Some balconies are triangular, while others span the entire bay. To achieve this design, we used a rigid frame structure with diagonal braces instead of the traditional column-and-beam structure. This approach allowed us to arrange the columns more flexibly, creating the desired space.

▼日景整体立面，Overall Daytime Elevation © Keishin Horikoshi

▼日景局部，Daytime Detail © Keishin Horikoshi

虽然其标志性的形状是面向城市景观的阳台，但其结构却可以让客人看到其他城市酒店所没有的东京的多面性。

The signature feature is a balcony that offers a view of the city. The structure also provides guests with unique perspectives of Tokyo, which are not typically available in other city hotels.

▼入口，Entrance © Keishin Horikoshi

▼入口近景，Entrance closer views © Keishin Horikoshi

除了采用带斜撑的钢框架结构，自由地改变平面和立面的同时，我们也追求最大限度地利用室内空间。柱和梁的横截面积保持较小，这座九层钢结构建筑的基本梁深度为 300 毫米，柱直径为 150 至 200 毫米。由于柱子的横截面积较小，因此可以隐藏在墙内，从而允许自然光沿着内墙不受干扰地照射。客房墙面采用弧形设计，形成与室外连续的封闭式室内空间，营造出宽敞的感觉。

Columns and beams are compact (beam depth: 300 mm; column diameter: 150–200 mm), hidden within walls to maximize natural light penetration. Curved walls in guest rooms blend indoor and outdoor spaces, enhancing spatial continuity.

▼室内_1F首层大堂，1F Lobby © Keishin Horikoshi

▼室内_1F首层大堂沙发，1F Lobby Sofa © Keishin Horikoshi

▼室内_1F首层大堂艺术品，1F Lobby Artwork © Keishin Horikoshi

▼室内_局部艺术品，Interior Detail Artwork © Keishin Horikoshi

03
客房体验
Guest room

客房内部的特点是无缝空间，弯曲的弧形墙壁。我们在墙壁上使用了硅藻土壁纸。硅藻土壁纸的微孔肌理与曲面墙体形成漫反射光环境，让客人在房间感受到柔和的光线，给人一种宽敞的感觉。室内光线充足且舒适，封闭的室内空间与外部直接相连。

Seamless spaces with curved walls and diatomaceous earth wallpaper create a soft, diffused light environment. The microporous texture of the wallpaper and wall curvature enhance both visual and psychological comfort.

▼室内_4F客房，4F Guest Room © Keishin Horikoshi

▼室内_6F客房，6F Guest Room © Keishin Horikoshi

▼室内_7F客房，7F Guest Room © Keishin Horikoshi

▼室内_9F客房，9F Guest Room © Keishin Horikoshi

▼室内_9F客房，9F Guest Room © Keishin Horikoshi

由于浴室在房间中占据了较大的面积，我们认为在设计布局时非常重要，但考虑到日本中央区有很多办公室的情况，有必要考虑确保从外部空间看不到浴缸等。为此，我们决定设计一个新布局，将淋浴间等功能放置在远离开口的区域，反而是将洗脸盆移到外面，以减少幽闭感。提升小尺度空间的心理舒适度，同时确保功能性和设计方面的良好设计。

Bathrooms are strategically placed away from openings to ensure privacy (critical in Chuo Ward’s office-dense area). The washbasin is relocated outside the bathroom, reducing spatial confinement while maintaining functionality.

▼室内_局部洗面台，Interior Detail Washbasin © Keishin Horikoshi

▼室内_局部桌台，Interior Detail Desk © Keishin Horikoshi

▼室内_局部客房局部，Interior Detail Guest Room Detail © Keishin Horikoshi

04
结语
Summary

小大建筑并不是任意地创造出引人注目的外观设计，而是专注于确保“阳台”的概念能够为建筑创造标志性的外观，并且不同类型的阳台能够直接为酒店创造均衡的房间组合。

Rather than pursuing overtly striking aesthetics, Kooo Architects focused on the ” Terrace ” concept to shape the hotel’s identity. Variations in balcony designs directly correspond to room types, achieving a balanced mix.

▼室内_8F客房，8F Guest Room © Keishin Horikoshi

用一点小小的努力解决很多问题并将其转化为价值的方法是日本巧妙利用小居住空间的一种方式，我们认为这种设计将提供真正感受到东京的住宿体验。

This project exemplifies Japan’s ingenuity in transforming spatial constraints into value, offering a stay experience that authentically reflects Tokyo’s urban density.

▼夜景街道视角，Nighttime Street View © Keishin Horikoshi

▼夜景立面，Nighttime Elevation © Keishin Horikoshi

▼夜景入口，Nighttime Entrance © Keishin Horikoshi

▼平面图 1F，Floor Plan 1F © 小大建筑设计事务所

▼平面图 2&7F，Floor Plan 2&7F © 小大建筑设计事务所

▼平面图 3&6F，Floor Plan 3&6F © 小大建筑设计事务所

▼平面图 4F，Floor Plan 4F © 小大建筑设计事务所

▼平面图 5&8F，Floor Plan 5&8F © 小大建筑设计事务所

▼平面图 9F，Floor Plan 9F © 小大建筑设计事务所

▼立面图，Elevations © 小大建筑设计事务所

▼剖面图，Section © 小大建筑设计事务所

项目名称：Hotel rakuragu
项目类型：建筑设计
设计方：小大建筑设计事务所
公司网站：http://www.ko-oo.jp/
联系邮箱：kooo-contact@ko-oo.jp
项目设计：2021
完成年份：2023
设计团队：小嶋伸也，小嶋綾香，中村靖怡
项目地址：東京都中央区日本橋本町1-7-9
建筑面积：441.62㎡
摄影版权：Keishin Horikoshi / SS
合作方：株式会社日向興発（施工）/ 株式会社田中哲也建築構造計画（结构） / ZO設計室（设备）/ 株式会社大好照明（照明）/ 鈴木哲生（标识设计）/ 艺术品：We+
客户： A.M Inc.
材料：水泥板，木材，铝材，墙纸
品牌：Hotel Rakuragu

Project name:Hotel rakuragu
Project type:architecture
Design: kooo architects
Website: http://www.ko-oo.jp/
Contact e-mail: kooo-contact@ko-oo.jp
Design year:2021
Completion Year:2023
Leader designer & Team: Shinya Kojima, Ayaka Kojima, Yasue Nakamura
Project location: 1 Chome-7-9 Nihonbashihoncho, Chuo City, Tokyo 103-0023, Japan
Gross built area:441.62 ㎡
Photo credit: Keishin Horikoshi / SS
Partner:HYUGA KOUHATSU CORPORATION（constructor）/ TETSUYA TANAKA STRUCTURAL ENGINEERS (structure design) /
ZO COSULTING ENGINEERS(facility design) / DAISUKI LIGHT (lignt design) / Tetsuo Suzuki (sign design) / Ground floor art: We+
Clients:A.M Inc.
Materials: Cement board, wood, aluminum, wallpaper
Brands:Hotel rakuragu

More: 小大建筑设计事务所。更多关于他们： kooo architects on gooood

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