缆索吊装扣塔偏位对拱肋高程影响的几何分析

利用几何分析法,推导了扣塔偏位对拱肋节段高程影响的计算公式。结合新龙门大桥缆吊系统,分析了扣塔和主塔偏位对拱肋节段高程的影响。分析结果表明,新龙门大桥扣塔高度和位置的改变对高程影响很小,可忽略不计;主塔偏位对节段高程影响相对较大,应在施工控制中加以考虑。该方法和分析结果对缆索吊装的设计和节段安装高程控制有一定参考价值。

Geometrical Analysis of Arch Rib Elevation Change Caused by Tower Deviation during Cable-Hoisting Construction

Making use of geometrical analysis method,the formulas of elevation change caused by tower deviation have been developed.Combining with the cable-hoisting system of New Longmen Bridge,the segmental elevation changes are discussed on deviation of cable-tower and main-tower.The results show that the effects are too small to be taken into consideration for New Longmen Bridge cable-hoisting system,when the height and position of cable-tower has displaced.However,the effect of main-tower deviation on segmental elevation is relatively larger,and it must be taken into consideration during the construction control.The methods and analysis results proposed are of referential value for the design of cable-hoisting systems and the control of segmental elevation.