中承式钢桁架系杆拱桥设计与施工关键技术研究

Design and Key Construction Technology of Half-through Steel Truss Tied Arch Bridge

中承式钢桁架系杆拱桥因具有结构体系要经过多次受力转换、关键节点受力大、施工精度要求高、施工控制要求严格等难点,对其设计和施工关键技术进行研究很有必要。以横琴二桥为研究对象,首先介绍了该拱桥主桥约束体系、平纵联及桥面系等关键结构的设计方案;然后结合实际总结出工程的施工特点与技术难点,并在此基础上分别对主桥上、下部结构的施工关键技术进行了分析;最后,借助MIDAS/Civil有限元软件模拟计算出施工过程中应重点监测的最大应力位置,以保证工程的施工质量及安全。

Half-through tied steel truss arch bridge construction has many difficulties, such as the structural system has to undergo multiple force conversion, the key nodes are stressed heavily, the construction precision is high, and the construction control requirements are strict, so it is necessary to study the key technology of its design and construction. Taking Hengqin No.2 Bridge as the research object, this paper firstly introduces the design scheme of the key structures of the arch bridge, such as the restraint system of the main bridge, the horizontal longitudinal connection and the bridge deck system, and then sums up the construction characteristics and technical difficulties of the project combined with the actual situation, and on this basis, analyzes the key construction technologies of the upper and lower structures of the main bridge, and finally, with the help of MIDAS/Civil finite element software simulation,in order to ensure the construction quality and safety of the project, the maximum stress position should be monitored in construction process.