超大跨径钢管混凝土拱桥主拱线形控制误差分析

Error Analysis of Alignment Control for Main Arches of a Long-span Concrete-filled Steel Tube Arch Bridge

大跨径钢管混凝土拱桥是一种自架设体系结构,结构的刚度随施工的进行逐渐组合而成,拱肋的线形控制是实现设计成桥目标的关键。在类似采用斜拉扣挂法施工的超大跨径钢管混凝土拱桥拱肋吊装过程中,主拱线形除了受索力误差、温度误差等传统因素影响外,还有一些潜在误差也应引起重视,如自重误差、定位误差、扣塔偏位误差等。该文以合江长江一桥拱肋吊装为背景,对索力误差及上述潜在误差对主拱线形可能产生的影响进行了计算分析,以期对此类超大跨径钢管混凝土拱桥主拱线形控制起到一定的借鉴作用。

The long-span concrete-filled steel tube arch bridge is a self-built architecture,the stiffness of such structure is gradually formed along with the proceeding of construction,and the alignment control of arch ribs is the key to achieving the goal of bridge design.In the arch rib hoisting process of a super long-span concrete-filled steel tube arch bridge with the cable-stayed suspension method,the alignment of main arches is affected not only by traditional factors like errors in cable force and temperature,but also by some potential errors in dead load,positioning,buckle tower deviation,and so on.Based on the hoisting of arch ribs of Hejiang Yangtze River Bridge,this paper analytically calculated the possible impact of cable force errors and the above potential errors on the main arch alignment,so as to provide reference for the alignment control of the main arch of such super long-span concrete-filled steel tube arch bridges.