某大跨网状吊杆拱桥设计与施工方案研究

深圳市深汕合作区某大桥采用230 m主跨网状吊杆拱桥一跨过河设计方案，主桥全宽56 m，主梁采用纵横梁体系钢-混组合梁断面；主拱采用六边形箱形断面，拱轴线按二次抛物线设计，矢跨比为1/5.5，拱高为41.273 m。大桥采用无柔性系杆体系，采取先梁后拱架设工序；结合内河航道无大节段钢梁运输条件、桥址处位于台风高发期的复杂施工条件，提出了主梁采用岸边原位拼装、支架滑移法施工方案，主拱采用拱脚段低位拼装、跨中段整体提升安装方案。该桥的设计理念和施工方案验证了网状吊杆拱桥在市政桥梁中的适用性、可实施性和经济性，相关研究和设计成果为今后同类桥型设计和施工提供借鉴。

Study on Design and Construction Schemes of a Large-span Mesh Suspender Arch Bridge

The design scheme of 230 m main-span mesh suspender arch bridge crossing river is used for a bridge in the Shenzhen Shantou Cooperation Zone of Shenzhen. The total width of the main bridge is 56 m. The longitudinal and transverse beam system steel-concrete composite beam cross-section is used for the main girder. The hexagonal box shaped cross-section is used for the main arch. The arch axis is designed according to a quadratic parabola. The rise span ratio is 1/5.5, and the arch height is 41.273 m. The non-flexible tie rod system is used for the bridge. Its process of erecting beams first and then arches is used. Combined with the transportation conditions of steel beams without large sections in the inland waterway and the complex construction conditions of the bridge site located in the high incidence period of typhoons, a construction scheme of using shore in-situ assembly and bracket sliding method for the main beam is proposed. The scheme of using the low-level assembly at the arch foot section and the integral hoisting installation in the middle span is used for the main arch. The design concept and construction scheme of this bridge have verified the applicability, feasibility and economy of the mesh suspender arch bridge in municipal bridges. The relevant research and design results provide reference for the design and construction of similar bridges in the future.