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浙江省继兰江、婺江两座双曲拱桥应用桁架伸臂法施工之后,又采用该法悬拼大跨度单室薄壁箱型拱,为我国拱桥施工积累了经验,提供了新的方法。 一九七九年六月,华东地区公路情报网于浙江嵊县召开桥梁经验交流会,参观了清风桥单室薄壁箱型拱的桁架伸臂法施工工艺。现将该桥的情况综合报导如下。 一、单室薄壁箱型拱 清风桥位于浙江嵊县清风镇,横跨曹娥江上游,系2孔92米单室薄壁箱型拱结构。设计荷载汽—15,挂—80。桥面净宽7+2×0.75米人行道,拱轴系m=1.347,矢跨比f/L=1/9。桥型布置如图1。
After the construction of two double-curved arch bridges in Lanjiang and Wujiang provinces of Zhejiang province by using the truss extension arm method, this method can also be used to rebuild large-span single-walled thin-walled arch arch bridges, which has accumulated experience for the arch bridge construction in our country and provided a new method . In June 1979, the East China Highway Information Network held a bridge experience exchange meeting in Sheng County, Zhejiang Province, and visited the truss extension arm construction method of the single-chamber thin-walled box arch of Qingfeng Bridge. The situation of the bridge is now reported as follows. First, single-chamber thin-walled arch Qingfengqiao is located in Qingfeng Town, Shengzhou, Zhejiang, across the upper reaches of Cao’e River, Department of 2 holes 92 m single-chamber thin-walled box arch structure. Design load steam -15, hanging -80. Bridge width of 7 + 2 × 0.75 meters sidewalk, arch axis m = 1.347, sagittal ratio f / L = 1/9. Bridge layout shown in Figure 1.