蝶恋花–中国·第十届中国花卉博览会世纪馆

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来源：搜建筑、华建集团华东院

中国·第十届中国花卉博览会世纪馆

华建集团华东建筑设计研究总院

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 2021年4月施工现场 ©王华

第十届中国花卉博览会世纪馆

上海市崇明区

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲世纪馆鸟瞰 ©刘文毅

2021年五月第十届中国花卉博览会在上海崇明举行，以“蝶恋花”为主题的世纪馆是两大永久展馆之一。作为平面翼展近300米的大型地景式覆土建筑，世纪馆不仅打造了全国最大的自由曲面连续拱壳混凝土屋面结构，还通过对自然风、光资源的充分利用实现了本次花博会低能耗、低消耗的“生态办博”理念，描绘出花开盛世、多元文化和谐共融的美好画卷。

The 10th China Flower Expo is held in Chongming, Shanghai on May 21st, 2021, Century Pavilion, which is one of the main venues, is themed at “Butterfly and Flower”. As an earth-sheltered landscape architecture spanning over 280 meters, Century Pavilion created the biggest free boundary continuous arch concrete shell all over the nation, and also realized the idea of the ecological expo with the fully utilizing climatic resources，to celebrate this flourishing and harmonious age.

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 屋面“花坡” ©刘文毅

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 屋面“花坡” ©刘文毅

生态可持续的稀有木本花卉展览馆

作为木本花卉展馆，世纪馆总建筑面积12348平方米，包括东馆与西馆两个部分，东馆为沉浸式的视觉艺术多媒体展厅而西馆为实体珍稀木本植物主题馆，两馆之间通过连桥相互连接。

为规避短期展会的集中高能耗，世纪馆充分利用过渡季的温和气候，以整体开敞的策略营造全自然的通风采光环境，通过被动式的节能策略最大程度地降低了设备系统的负荷。

独立展厅作为可替换的功能单元，与薄壳主体结构分离，从而为展厅的布置提供了足够的兼容度，也为会后改造时的新旧功能单元替换提供了最大灵活度，以此实现可持续性的发展。生态可持续的建筑技术手段，使世纪馆成为国内首批获得WELL金级中期认证的展览建筑。

Ecological and Sustainable Rare Botanic Garden. Positioned in a rare botanic exhibition hall, the 12348㎡Century pavilion consists of two parts: multi-media showroom in eastern wing and plants showroom in the western wing, with a silk bridge hanging across the main axis connecting them. To avoid dramatic energy consumption, the mild climate of transition season is fully utilized in an open façade system to increase cross ventilation and natural lighting, and this passive energy-saving strategy decreased equipment system load. In addition, showrooms are built into replaceable units which are detached from the main structure, ensuring maximum compatibility in future renovation. Century Pavilion has fulfilled the requirements of the WELL BUILDING STANDARD at the GOLD level, and three-star green building certification design label.

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 屋面“花坡” ©刘文

“蝶恋花”

以“蝶恋花”寄托破茧成蝶的寓意，世纪馆取形于中华虎凤蝶，覆土坡屋面在南向形成一面花坡，与全开敞的北立面形成 “虚”与“实”的对比，流畅的曲线兼顾造型与使用空间的合理性，使世纪馆呈现出振翅欲飞的神态。

Butterfly and Flower. Implicating transmutation, the form of Century Pavilion is abstracted from Luehdorfia chinensis, which is a Chinese national treasure. The sloped roof creates a solid wall of flowers that contrasts with the open north façade. The concise curvature benefits the rationality of form as well as space, presenting the posture of flying

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 屋面“花坡” ©刘文毅

“薄壳”助力结构蜕变

结构是世纪馆最大的挑战。壳体结构的应用实现了结构厚度的最小化，并发展出了独创的自由边界预应力平衡混凝土薄壳体系。跨度280米的薄壳由“树林”状的摇摆柱阵支撑，并应对蝴蝶的自由边界将单拱化解为连续拱组合，从而进一步将壳体的厚度减小至250mm。最大1.6米的拱高被消隐在屋面的覆土层内，在满足结构合理性的同时兼顾空间的实用性，实现壳体下使用空间的纯净性。

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 连续拱壳生成 ©华建集团华东建筑设计研究总院

三层1080°的不等半径螺旋楼梯以单柱撑起80吨的重量并悬挑10m，在创新性的设计中挑战了结构的极限。

Structure Orientated Design. The structure is an enormous challenge. A concrete shell is introduced to minimize structural depth and developed into a pioneering “Prestressed Balanced Concrete Thin Shell with Free Boundary” system. The shell spanning over 280 meters is supported by forestry leaning columns and developed from a single arch into a continuous arch to adapt to Butterfly’s free form boundary, thus minimizes the thickness of the concrete shell to 250mm. This arch height, reaching 1.6meter, is buried in the soil of an earth-sheltered roof ensuring a pure and intact space beneath the shell. The 3 levels 1080°spiral stair supported by single column weights 80tons, its 10 meters cantilever challenges the limit of structure.

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 东馆与西馆 ©刘文毅

纯净的曲面空间

为保证曲面空间的纯净性，世纪馆将地下的结构拉结层发展为容纳综合管廊的空间，将原本在楼板下穿行的设备管线全部隐藏。整体开敞的设计策略使每个展厅均独立配备空调系统，避免了穿越公共空间的风管和屋面设备机组，在净化室内空间的同时使“第五立面”成为纯净的“花海”。

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 地下管廊 ©华建集团华东建筑设计研究总院

光导管将天光引入壳体下幽暗的空间，营造出“洞窟”式的空间意境，强调了一种刻意的冷静。冷静的室内空间与五彩缤纷的覆土屋面形成强烈的对比，在近距离尺度下凸显了曲面空间的表现力。

纯净的曲面空间是全专业反复磨合的成果，是各种特例与巧合综合而成的特殊解，成就了世纪馆的唯一性。

Purifying Space. To ensure the purity of curvature spaces, pipelines are concealed in an underground mezzanine which develops from structure foundation counteracting arch thrust. Equipment is attached to each showroom to avoid air channels, and to ensure a clear fifth elevation with flowers. The sunlight directed to the dark interior via light guides enhances the atmosphere of the cave-like space, and the contrast between the calm interior and colorful exterior emphasized the performance of the space. The pure curvature space is resulted from the cooperation of all professions, making the butterfly special and unique.

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 振翅欲飞 ©刘文毅

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 开敞的北立面 ©刘文毅

施工

为了降低清水混凝土的建造成本，世纪馆的施工用“针尖法”取代了预制模板，通过在0.8*0.8米的坐标网上密布钢管逐点模拟高程，总共3万个坐标点形成了“针尖阵”还原出了壳体的曲面形态。覆土屋盖种植区被划分为2m见方的网格，利用屋面施工已存在的构造拉结钢丝网片进行固土，化整为零从而避免了整体滑坡的风险，为后续“花海”的种植提供了安全性的保障。

Construction. To realize a low-cost as-cast-finish concrete, prefabricated forms are replaced by a tip positioning system. More than 30 thousand pipes are erected in a 800mm*800mm grid to locate the coordinates of the shell’s lower surface. To stabilize plants on the sloped roof, the planting layer is divided into 2m*2m blocks to plant flowers separately, and is thus convenient for replacing.

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 世纪馆可替换单元 ©华建集团华东建筑设计研究总院

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 连桥 ©刘文毅

蝶恋花--中国·第十届中国花卉博览会世纪馆

▲ 连桥 ©刘文毅

“蝴蝶”壳体是世纪馆解决问题的手段，集合了所有对设计的思考。巨型的覆土地景式坡屋面从建筑的本质出发，在解决设计问题的过程中逐渐促成了蝴蝶第五立面的“花海”的效果，使世纪馆的设计实践过程成为了一场突破制约条件的“蜕变”过程。

“Butterfly” is not only a prominent characteristic in appearance, but also a critical factor in solving contradictions. The earth-sheltered landscape shell deriving from the very nature of architecture is finally realized as a blooming roof garden, and the design practice turned into a restriction-breaking “metamorphose” process.

蝶恋花--中国·第十届中国花卉博览会世纪馆