Designed by CSCEC, the "Liuyun"(floating cloud) Bridge—the world's longest polymer 3D printing bridge, was unveiled in the Yima River Park in Longquanyi District, Chengdu recently.

equiped with cutting-edge technologies, the bridge has a total length of 66.8 meters, of which 21.58 meters is 3D printed. The widest part of the bridge is 8 meters, and the highest is 2.68 meters.

The construction methods, such as sectional printing and on-site assembly, have been adopted and the largest intelligent equipment for printing polymer materials in Shanghai has been used. The bridge is fully unattended and can automatically work 24 hours a day. It took 35 days to print the bridge with 12 tons of materials.

The design team treated the drainage and lighting requirements of the bridge deck with holes and buried pipes. In order to improve the comfort and stability of traffic, steel beams are added under the bridge to support the bridge. The railings at both ends of the bridge are made of lightweight aviation materials, which are carved by digital numerical control, and the surface is treated with special coating to meet operating requirements.

The ecological design method to construct the flood discharge channel in the Yima River Park has been adopted. The revetment is designed in an eco-friendly way, and a wetland purification system has been established. Through ecological revetment, low-cost maintenance can be realized. The team used the special bricks to make shoreline stabble as well as nests for fish and amphibians to inhabit and breed, and a original bamboo forest is retained.

A slow-moving green corridor has been specially designed in the park, connecting Dong'an Lake Park and extending to Longquan Mountain Urban Forest Park in the south and the main venue of Universiade (The 31st summer Universiade) in the north. The green corridor is 120 meters long and 70 meters wide, and it connects Huanhu South Road by a cover plate, which is not only for pedestrians to pass through, but also for animals to migrate. The green corridor is an important part of ecological restoration in the Universiade area.

Every step in the park is decorated with a bunch of flowers, and a colorful garden is formed by using the multi-layer steps piled up by waste soil, which has made the park landscape more scaled,  enlarged the green area, made good use of waste materials, and further enlarged the ecological value in the park city construction.