一纸桥丨中国浙江丨泛式建筑

一纸桥，莫干山阜溪七桥中的一桥。泛式建筑于 2022 年七桥国际竞赛中获得了其中两座步行桥梁的设计权。一纸桥，便是其中一座。

Folio Bridge, one of the seven bridges in Fuxian, Moganshan. Far workshop won two pedestrian bridges in the 2022 Seven Bridges International Competition. Folio Bridge is one of them.

▼鸟瞰，Bird’s eyeview© Biosphere 建筑摄影

▼项目概览

Overall view© Biosphere 建筑摄影

如纸

Like a sheet of paper

一纸桥，源于对一张 A4 纸的想象。如何让一张纸，仅仅通过几条折痕便可达到一定的力学强度，同时又能维持纸张本身轻薄且略有脆弱的反差感。

Folio Bridge originates from the imagination of an A4 sheet of paper. How can a piece of paper achieve a certain mechanical strength just by a few creases, while also maintaining the paper’s own light and slightly fragile contrast.

▼折痕研究，paper crease study© 泛式建筑

我们在测试了多种折痕的可能性后，选择了仅通过一条折痕来实现桥梁跨度的想法。在与张准老师的和作结构研究所的合作中，我们确认了通过三条构造曲线以及一个构造点来拟合折痕的桥体形式。通过反复调整三条构造线的曲率以及上方构造点的位置来寻找受力的最佳分布。

▼构造线与构造点的调控，adjustment of construction lines and point© 泛式建筑

▼三维成像研究，3d modeling study© 泛式建筑

▼结构模型参数分析，structural analysis diagram© 泛式建筑

After testing various possibilities of creases, we chose the idea of achieving the bridge span with just one crease. In the modeling process, we confirmed the bridge body form by fitting three construction curves and one construction point to the crease. In collaboration with Zhang Zhun’s Structural Research Institute, we repeatedly adjusted the curvature of the three construction lines and the position of the construction point above to find the best distribution of forces.

▼俯瞰，Top view© Biosphere 建筑摄影

▼桥梁远观，Distantview© Biosphere 建筑摄影

▼桥梁近景，Closeview© Biosphere 建筑摄影

如山 Like a mountain 最终确定的桥体由于坡度过大，我们放弃了直接让行人上桥面的可能性。隆起的桥面，我们看到了西面的山。或者我们可以让人们走上这座桥如同走上山间的小路，一条细长的踏步小径架在桥面上，下面是如纸薄般的厚重的山。

Due to the steep slope of the final determined bridge body, we abandoned the possibility of allowing pedestrians to directly ascend the bridge surface. The bulging bridge surface, we saw the mountain to the west. Or we could let people walk on this bridge as if walking on a mountain path, a slender stepping path is placed on the bridge surface, with a mountain as massive as it is as thin as paper.

▼从河堤看向桥梁，View from the riverbank to the bridge© Biosphere 建筑摄影

▼从附近竹林看向桥梁，View of the bridge from the nearby bamboo forest© Biosphere 建筑摄影

▼隆起的桥面，The bulging bridge surface© Biosphere 建筑摄影

为了最大程度消解踏步小径的实体感对桥体本身的视觉干扰，我们采用了纤细的高强度螺纹钢筋作为单一材料，完成了从支撑到踏板以及扶手的材料一体化。

▼桥梁分解示意，Bridge Structure Explosive Diagram© 泛式建筑

▼局部桥面与踏步关系，the relationship between bridge body and steps© 泛式建筑

To minimize the visual interference of the stepping path’s solid sense on the bridge body itself, we used slender high-strength threaded steel bars as the single material to complete the material integration from support to step and handrail.

▼踏步小径，The stepping path© Biosphere 建筑摄影

▼踏步细部，Step details© Biosphere 建筑摄影

施工 Construction

整座桥跨度 15.825 米，桥体钢板厚度 25mm，由于桥体的曲线复杂，施工方事先根据设计剖面制作了一个定位框架。桥体被分解成了多块不同曲率的钢板，用压轴机进行人工弯折调试。最后通过已制作好的框架进行空间定位及整体焊接。最后再安装螺纹钢筋步道。

▼连续横截面变化，continuous cross-sectional variation© 泛式建筑

▼钢板分解示意，Steel Plate Breakdown Schematic diagram© 泛式建筑

▼桥梁施工临时框架定位示意图，temporary steel-frame for bridge body building© 泛式建筑

The entire bridge spans 15.825 meters. Due to the complex curves of the bridge body, the construction side made a positioning frame according to the design section in advance. The bridge body was divided into multiple steel plates with different curvatures, which were manually bent and adjusted by a press machine. Finally, they were spatially positioned and welded as a whole through the pre-made frame. The threaded steel bar path was installed afterwards.

▼施工现场，construction in factory© 泛式建筑

▼桥梁整体运输及吊装，bridge transportation and construction on-site© 泛式建筑

由于本桥的结构特殊性，投入使用前进行了原位堆载实验。

▼全桥堆载实验，wholebridge loading test© 泛式建筑

Due to the unique structural characteristics of this bridge, a load test was conducted on-site before it was put into use.

▼从附近草丛看向桥梁，View of the bridge from nearby bushes© Biosphere 建筑摄影

▼轻薄的桥身，Thin bridge body© Biosphere 建筑摄影

▼居民在桥上行走，Residents walking on the bridge© 泛式建筑

后记 Epilogue 由一张轻薄的“纸”折成了一座“厚重的山”，纤细的钢筋弯成了“山间的小路”，一纸桥其实是在谈论某种由极致的结构所带来的矛盾的假象，当人们步行上桥之时，这种假象试图唤起人们对于桥的空间体验的身体知觉。这便是这座桥带来独特的意义。

This bridge, made from a thin sheet of ’paper’ folded into a’massive mountain’, and with delicate steel rebar bent into’mountain paths’, is discussing a kind of paradoxical illusion brought about by extreme structure. As people walk on the bridge, this illusion tries to evoke people’s bodily perception of the spatial experience of the bridge. This is the unique significance that this bridge brings.

▼场地平面图，master plan© 泛式建筑

▼桥梁整体三维形体研究，integration 3d study © 泛式建筑

项目名称: 一纸桥

项目类型：步行桥

项目策划：urbaneer 都市工作群

建筑设计：泛式建筑 / 王莽源，杨洋，李睿

结构设计：和作结构建筑研究所/ 张准，张冲冲，胡晓劼

设计统筹管理：ConCom 集良建筑

摄影师：Biosphere 建筑摄影（周子杰，俞诵陶），杨洋，王莽源

设计时间：2023-2024

建筑面积：15.825 米跨度