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采用软硬组合牵引的方法完成斜拉索的梁端牵引锚固在我国斜拉索架设施工中的应用尚属首次,有必要对其牵引受力机理进行研究,以确定其可行性、合理性及安全性。文章以苏通大桥为例,对长索牵引过程进行仿真分析,研究分析了张拉杆角度调整对整个牵引系统的影响。分析认为,采用这种施工方式能够充分发挥软牵引与硬牵引的各自优势。硬牵引减小了软牵引力,将软牵引钢绞线数量减少,使软牵引钢绞线受力均匀性更容易控制,降低了软牵引的施工风险与难度,软牵引的使用又可以缩短硬牵引长度,降低硬牵引风险。
It is the first time to use the combination of soft and hard traction to complete the cable-stayed traction and anchorage of the stay-cables in the construction of the cable-stayed girder in our country. It is necessary to study the mechanism of the traction forces to determine its feasibility, rationality and safety. Taking Sutong Bridge as an example, this paper simulates and analyzes the long-haul towing process, and analyzes the influence of tension rod angle adjustment on the whole towing system. Analysis, that the use of this construction method can give full play to the advantages of soft traction and hard traction. Hard traction reduces the soft traction, reducing the number of soft-drawn strands, making it easier to control the force homogeneity of the soft-drawn strands, reducing the risk and difficulty of soft-traction construction. The use of soft-pull can shorten the hard-traction Length, reduce the risk of hard traction.