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由于空缆与成桥的横向坐标相差很大,空间索形悬索桥主缆在施工过程的线形转换直接决定着吊索能否安装与其弯折损伤程度。通过分析典型工程的横向偏位与偏角,揭示了不同桥型空间转换的作用与对策;分析指出不同工法的吊索横向偏角差异,并给出计算公式。提出临时缆间横撑法,发明缆间横撑装置和配套索夹,有效解决了一座“先缆后梁”法施工的空间索形悬索桥的主缆线形转换及吊索安装问题。工程应用和算例分析表明,该文方法适用于“先梁后缆”法和“先缆后梁”法;施力效率高,安全余度大,安装一次到位无需中间调整,不会制约和影响施工工序的制定;对吊点提供刚性约束,对横向偏位与偏角的控制效果更好,有更大的安全余量容许施工误差,能够适应复杂现场常需的工序中途调整,可施工性更强。
Due to the large difference between the lateral coordinates of the aerial cable and the bridge, the linear conversion of the main cable of the cable suspension bridge during the construction process directly determines whether the sling can be installed and the extent of the bending damage. By analyzing the horizontal deviation and declination of the typical project, the function and countermeasure of space conversion of different bridge types are revealed. The differences of slippage of different slings are analyzed and the formulas are given. The author puts forward the method of temporary cable tie-strut method and invented the cross-bracing device and supporting cable clamp between cables and effectively solves the main cable-type conversion and sling installation of a cable-suspended suspension bridge with a “first cable back beam” method. The engineering application and the example analysis show that the method is suitable for the “first beam after the cable” method and the “first cable after the beam” method; force the high efficiency, safety margin, installation in place without intermediate adjustment, not Which will restrict and influence the establishment of construction procedures. It provides rigid restraints for hanging points, better control of lateral deviation and declination, greater allowance for construction allowance, and adaptability to the process often required in complicated sites. , More workability.