索风营水电站倒张拱钢索桥介绍

Brief introduce of Inverted Tensioning Arch Wire Bridge of Suofengying Hydropower Station

钢索桥具有架设跨度大、施工时间短、建造成本低、便于跨越深涧峡谷等突出优点,但传统钢索桥的最大弱点是桥面侧向稳定性差,当荷载通过桥面时,将引起桥身剧烈晃动。在贵州乌江索风营水电站坝址下游修建的倒张拱钢索桥,运用荷载替换方法,在不增加或少增加钢索用量的情况下,解决了传统钢索桥侧向稳定性差的弊端。荷载试验检测结果显示,当设计荷载内的荷载通过该桥时,检测点中桥面的最大转角为1°02′44 7″,表明桥身侧向稳定性好。该类桥型自重小、刚度大,具有良好的应用前景。

The wire bridge has some outstanding advantages such as big span,short building period,less cost,easy construction on deep valley and etc.,but the biggest frailty of conventional one is bad side stability,when load passes on the face of the bridge,the body of bridge strongly swings.The inverted tensioning arch wire bridge built on downstream of dam sit of Suofengyin Hydropower Station solved the problem of bad side stability of conventional one under the conditions of no adding or less adding still cables,using load instead method.The results of load test showed when a load within design scope passed the bridge,the biggest quoin of bridge face center in the measure point was 1°02′44.7″.This kind of bridge has less dead weight,bigger stiffness,and has a good application prospect.