矮塔斜拉桥交叉抗滑键技术的研究

矮塔斜拉桥一般采用环氧握裹式对拉索整体抗滑,但该装置无法实现单根钢绞线抗滑和单根换索,提出采用交叉抗滑键抗滑装置,研究该装置在矮塔斜拉桥中的应用。通过有限元分析、抗滑力试验、疲劳寿命、布置形式研究可知,抗滑键能够可靠地握裹住钢绞线、具有足够的抗滑能力及良好的抗疲劳性,采用交叉布置形式,解决了单根钢绞线抗滑和单根换索难题。根据交叉抗滑键模拟张拉工艺试验总结、完善其张拉工艺,并在山西临汾汾河桥中成功应用。

Research on cross anti-slip key technology of cable-stayed bridge with low tower

Generally, epoxy gripping type is used for overall anti-slip of cable in cable-stayed Bridges with low towers, but this device cannot realize anti-slip of single strand and single cable change. The cross-key anti-slip device is proposed to study its application in low tower cable-stayed Bridges. Through finite element analysis, anti-slip force test, fatigue life and layout study, it can be seen that the anti-slip key can reliably hold the steel strand, has sufficient anti-slip ability and good anti-fatigue property, and adopts the cross-layout form to solve the problem of anti-slip and single cable replacement of a single steel strand. The tensioning process of the cross anti-slip key was summarized and perfected according to the simulated tensioning process test, and it was successfully applied in Fenhe Bridge in Linfen, Shanxi Province.