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斜拉-悬索协作体系桥梁整体刚度大,在大跨公铁两用桥中极具竞争力。该文依托在建的博斯普鲁斯海峡三桥,从不同施工工序、不同合龙口位置、结构受力特性、工期和施工措施等方面对地锚式协作体系桥梁3种总体施工方案进行对比。结果表明:跨中合龙方案、重叠区拉吊索同步施工合龙方案和重叠区拉吊索异步施工合龙方案均可行,其中重叠区拉吊索异步施工合龙方案具有结构受力合理、工期较短、合龙便利等优点,推荐采用。
Cable-stayed cable suspension system, the overall bridge stiffness, in the long-span railway dual-use very competitive. Based on the Bosphorus Bridge under construction, this paper compares the three kinds of overall construction schemes of the bridge with anchor-type cooperation system in terms of different construction procedures, different positions of co-elbows, stress characteristics of structures, construction period and construction measures . The results show that both the cross-bridge closure scheme, the pullover construction scheme in the overlap zone and the asynchronous construction and closure scheme in the overlap zone are feasible. Among them, the asynchronous construction and closure scheme of the pullline in the overlap zone has the advantages of reasonable structure stress, short construction period, Closure convenience, etc., recommended.