申嘉湖京杭古运河大桥设计浅议

针对申嘉湖高速公路京杭古运河大桥提出了预应力混凝土连续梁桥和斜拉桥两种不同的桥式方案。通过经济性、安全性、实用性、耐久性和施工等方面的比选,建议采用55m 80m 55m的变截面连续箱梁桥方案,并运用桥梁博士对主梁进行了施工阶段和使用阶段的内力计算和估索计算。验算结果表明,所选的预应力混凝土连续梁桥方案是合理的。

Preliminary Design of the Big Bridge of Old Jing-hang River Crossing Shenjia Lake

The main content of the design discussed here is a preliminary design of a pre-stressed concrete continuous beam bridge of Jing-hang River,which is located in the Jia-shen-hu expressway.In the overall design,two different preliminary conceptions(a pre-stressed concrete continuous beam bridge and a cable-stayed bridge) were draw up and compared.Through comparing by economy,safety,compatibility,durability,construction and so on,and at last the(55m 80m 55m) continuous box girder bridge with variable cross-sections is optioned as a suggested scheme.To the project,it is carried on the size of the section drafted in detail,and based on the practical situation,the way of cantilever concreting was used And then by use of the program named doctor of the bridge,the girder's internal forces in the construction stage and the use stage were calculated,and then the number of the tendon were estimated.After parameter adjustment,the number and the lay form of the tendon are gained.The calculation of the bearing capacity of pile foundation on the basis of the topography of the bridge site is done.The result of calculation indicates that the pre-stressed concrete continuous case beam bridge is rational.