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针对自锚式悬索桥缆索体系几何非线性较为明显,传统吊杆张拉控制方法精度较低的问题,提出采用张拉力与标记线双重控制方法进行精细化控制。首先确定自锚式悬索桥合理成桥状态,吊杆加工时预制环形标记线,根据张拉过程中分步张拉力计算对应主缆及主梁位移,得出各步张拉的标记线目标位置及锚杯外露量;对于边跨吊杆,进行首轮全桥吊杆张拉时以锚杯外露及标记线位置为控制量一次张拉到位;对于中跨吊杆,以张拉力及标记线位置为控制量分批逐步张拉到位,边跨吊杆内力随索鞍顶推被动增加至目标值。此方法已成功应用于南京小龙湾大桥与聊城湖南路大桥,实践结果表明:张拉力与标记线双控方法操作方便,可避免传统控制方法中繁琐的索夹位移测量工作及高空作业危险,各控制量间相互校核可快速识别并修正误差,避免各张拉步骤误差累积;所得成桥吊杆内力、主缆及主梁线形与目标成桥状态吻合良好。
Aiming at the problem that the geometric nonlinearity of cable system of self-anchored suspension bridge is obvious and the accuracy of traditional boom tension control method is low, a double control method of tension and marking line is proposed to finely control. First determine the self-anchored suspension bridge reasonable into the bridge state, boom processing prefabricated ring mark line, according to the tensioning step in the process of calculating the corresponding main cable and the main girder displacement to obtain each step of the tension mark the target position and The amount of anchor cup exposure; for the side of the boom, the first round of full-bridge boom tensioning to the anchor cup exposed and marked line position for the control of a tension in place; for the mid-span boom to tension and mark the line location In order to gradually control the amount of tension in batches in batons, while the internal force across the boom saddle push passive increase to the target value. This method has been successfully applied to the Nanjing Bridge and Liaocheng Hunan Road Bridge. The results show that the double-tension control method is easy to operate, which can avoid the cumbersome cable clamp displacement measurement and the risk of working at height. Check the amount of control between each other can quickly identify and correct the error, to avoid the cumulative error of each step of tensioning; resulting boom boom internal force, the main cable and the main beam linear with the goal of the bridge state is in good agreement.