深圳二分桥步行桥设计 | 张健蘅建筑事务所
Shenzhen is the fastest-growing city in the world, expanding over 1000 hectares of new construction land each year. Xiaomeisha is located in Dapeng Bay in the east part of the city, surrounded by mountains on three sides and facing the water on one side. It has always been a valuable natural spot for people to escape from urban chaos. Here the Split Bridge is designed for hikers to cross the lake. The idea of splitting the footbridge in to two paths is to open up choices of calm and relax for urbanites.
▲二分桥，Split Bridge ©白羽
The eight-meters-wide bridge is splatted into two four-meters passages. One is a straight body, which provides flatness. This is a barrier-free passage that can be used by walking, jogging, cycling, wheelchairs, and small strollers. The other one is an undulating leisure trail, which runs from ground level down to lake water level and up to higher level that overlooks the driveway. The streamlined design allows people to slow down, or in other words, gives people a choice to slow down, if they wish to.
▲八米宽的桥面一分为二，the eight-meters-wide bridge is splatted into two four-meters passages ©白羽
▲一边是笔直平坦的无障碍通道，一边是起伏的休闲步道 ©白羽 ，one of the two passages is a straight body, while the other one is an undulating leisure trail
To become a landscape feature, the design looks in to Jade Belt Bridge (famous in Chinese classical gardens) as reference. Straight line reflects water surface, while curved line represents the undulating hills. Two passage of Split Bridge makes a combination of both. Also, the different heights of walking trails create interesting viewpoints for spectators.
▲二分桥的曲直交错与平静的湖面相映成趣，straight line reflects water surface, while curved line represents the undulating hills ©白羽
We want simple solutions in construction. In plan, the bridge body is mainly composed of one straight line and one tangent arc, while the elevation is composed of multiple straight lines and multiple tangent arcs. To meet simple implementation during construction period, the design optimized the geometric composition and adjusted the curve distribution to have correspondence between the straight lines of the plane and the curve segment of the elevation, and vice versa, avoiding hyperboloid geometry.
▲平面图，plan ©Jane Z Studio
▲从林间望向二分桥，view from the trees ©白羽
To weigh the height and span of beams, also to release the bridge shrinkage, creep, and temperature stress, the design used rational structural division to compromise column position. In order to keep beam size within 750mm high, the column span was kept between 15 to 22 meters. The bridge body was divided into three parts. The juncture was formed by cantilever beams on both sides. The length of cantilever beams is within 4m.
▲立面图，elevation ©Jane Z Studio
As a municipal project, we want it cheap in cost. Split Bridge advocates the principle of economy and rapid construction. Low maintenance is also taken into account. Therefore, application of building materials adopts to the standards of Urban Management Bureau: colored asphalt, floor tiles, and metal railing. Besides, due to salty and wet environment by the sea, to ensure anti-erosion of structure, main body of the bridge adopts cast-in-place reinforced concrete structure.
▲桥面使用彩色沥青桥面，地砖，金属栏杆等基础的建筑材料 ©白羽，application of building materials adopts to the standards of Urban Management Bureau: colored asphalt, floor tiles, and metal railing
Nowadays, the value of rights to choose is mostly neglected, and efficiency is over dominating in urban living. Providing two walking modes, Split Bridge is an installation of performance art, which encourage public participant for reclaiming they rights of making choice.
▲鸟瞰，aerial view ©白羽
Project Name: Split Bridge
Location: Haikui Road, Yantian District, Shenzhen
Design Company: Jane Z Studio
Designer: Jane JH Zhang
设计团队：Thijs van Oostrum，王诗涛
Design Team：Thijs van Oostrum, Wang Shitao
Scale: 160 meters
Design Year: March 2015
Completion Time: September 2017
Main Materials: colored asphalt bridge decks, floor tile, metal railing
Client Name: Bureau of Construction Engineering Affairs, Yantian District, Shenzhen
Photographer: Bai Yu