Abstract:Liuxihe Bridge is located in Guangzhou Hot Spring Tourism Resort. In the process of bridge construction, the bridge has changed from overpass across the embankment road to at-grade with the embankment road because of the changed planning conditions. The main bridge in the construction is required to demolish and rebuilt or construct in another place. In order to utilize the original bridge structure to the utmost extent, to reduce the engineering cost, and also to meet the requirements of surrounding scenic area for the bridge landscape, and combined with the built conditions during the design, the different rebuilding schemes are compared and studied. After comparison and selection, it is finally to determine that the main bridge is a single-span 125 m through reinforced concrete bowstring arch bridge. The main bridge is composed of collar beam, arch rib and boom, which is constructed by the method of beam first and then arch. Its arch ribs are the reinforced concrete structures. The arch axis is a quadratic parabola, and the vector span ratio is 1/5. The collar beam is arranged according to the overall box section, and the single-box three-compartment prestressed concrete box section is adopted. The design ideas and methods in the rebuilding scheme of Liuxi River Bridge can be referred for the reconstruction and design of the similar old bridges in the future.
