压力分散型无粘结预应力锚索施工特点探讨

Discussion on construction characteristics of pressure-distribution prestressed unbonded anchor cable

压力分散型无粘结预应力锚索近年来广泛应用于各类边坡及地下隧洞群围岩加固工程中。为进一步完善该类锚索的施工技术,结合锦屏水电站大奔流料场高边坡支护施工经验,对该类锚索的作用机理及受力特征、工艺的优越性、施工难点及相应的处理措施等进行了分析总结。针对该类锚索单根钢绞线受力不均、锚头材质检测无标准等问题,提出了解决方案。

In recent years,pressure-distribution prestressed unbonded anchor cable is widely used in slopes and tunnel group reinforcement project.In order to further perfect the construction technology of the cable,after summarizing construction experience of high slope support for Dabenliugou quarry at Jinping Hydropower Station,the operation mechanism and mechanical features,technology superiority,construction difficulties and measures of the cables are analyzed.The solutions for uneven stress of single steel strand of the anchor cable,no check standards for anchor head etc.are put forward.