【摘要】 大跨度斜拉桥梁体受到多种环境因素的影响会发生变形，进而导致桥面CPⅢ控制点的成果具有多值性，昌赣高铁赣江特大桥主跨长300 m,采用常规的技术方法在如此大跨度斜拉桥上铺设无砟轨道难度较大。通过实测桥面CPⅢ点位高程、大气温度、梁体温度和桥塔位移变形，建立以上几种参数之间的关系模型，通过模型计算各个CPⅢ点在不同温度条件和桥塔偏移量下的变化量，并验证模型计算结果和实测结果较差小于规范要求的3 mm限差，进而采用模型计算的高程数据进行自由设站，设站精度均不大于规范要求的0.7 mm限差，说明本研究模型计算的CPⅢ点高程能够在实际工程应用中使用并满足规范的精度要求。更多还原

【Abstract】 The large-span cable-stayed bridge body tends to deform due to various environmental factors, which will lead to the results of CPⅢ control point on the deck being multivalued. The main span of the Ganjiang Bridge is 300m long and it is difficult to lay ballastless track on such a large-span cable-stayed bridge by conventional technical methods. In this paper, by measuring the elevation, atmospheric temperature, girder temperature and bridge tower displacement deformation of the CPⅢ point on the deck, the relationship model of the above parameters is established. Through the model, the variation of each CPⅢ point under different temperature conditions and bridge tower offset is calculated, and the difference between the model calculation results and the measured results is verified to be less than the 3 mm limit required by the specification. The range data are set freely and the accuracy of the station setting is less than or equal to specified 0.7 mm limit difference. This shows that the elevation of CPⅢpoint calculated by the model can be used in practical engineering applications and meet specified accuracy requirement.更多还原