在安装系列4700夹管阀时，建议在阀门法兰后面采用镀锌钢支撑环加固。
When installing the Series 4700, it is recommended that galvanized steel back up rings be used behind the valve flanges.
预应力张拉施工中夹片、钢绞线和锚环之间存在着很大的摩擦阻力。
There is much prestressing loss for friction resistance among wedge, steel strand and anchor-ring in engineering.
为保证碳筋不出现滑移，软金属管和碳筋间的摩阻角应大于锚环锥角和夹片与锚环之间的摩阻角之和；
To avoid slip of CFRP bars, the friction angle between soft metal pipe and CFRP bars should be larger than the sum of barrel's conical angle and friction angle between wedge and barrel.
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