组合梁斜拉桥主梁多节段循环施工技术

Research on Multi-Segment Cyclic Construction Technology of Main Girder of Cable-Stayed Bridge with Composite Girder

为了提高组合梁斜拉桥主梁的施工效率,探究组合梁多节段循环施工方法的合理性与可行性,对比分析了某组合梁斜拉桥单节段、两节段和三节段循环施工的工效,并采用有限元法对不同工况下钢梁和混凝土桥面板的受力进行了计算分析。结果表明:该桥在不改变辅助墩主梁及边跨合龙主梁施工工序的前提下,三节段循环施工的工效同两节段和单节段循环缩短的工期数相比,并未有更多的减少;两节段湿接缝循环浇筑施工既可满足结构受力要求,又大幅提高了施工工效;在不改变单节段施工各节段张拉索力的前提下,可采用二次调索的方法,使斜拉桥达到合理的成桥状态。

In order to improve the construction efficiency of the main girder of composite beam cable-stayed bridge and prove the rationality and feasibility of the construction method of multi-segment wet joint cyclic pouring,in this paper,the working efficiencies of Single-segment,Two-segment and Three-segment cyclic construction of composite beam cable-stayed bridge have been compared and analyzed.The force of steel beam and concrete bridge deck under different working conditions has been calculated and analyzed by spatial finite element.The results have shown that on the premise of not changing the construction process of the auxiliary pier main girder and the side span closure main girder,the three-segment cycle process efficiency calculation has been carried out.Being compared with the two-segment and single-segment cycle shortened construction period,there is no more reduce.The cyclic pouring construction of two-segment wet joints can meet the stress requirements of the structure.The construction efficiency has been greatly improved.On the premise of not changing the tension force of each segment of single segment construction,the method of secondary cable adjustment can be used to make the cable-stayed bridge reach a reasonable state of completion.