空间竖琴形索面矮塔斜拉桥设计与实践

Design and Practice of Low-pylon Cable-stayed Bridges with Spatial Harp-type Cable Planes

摘要:

金桂路跨浏阳河桥为主跨120 m的双塔双索面矮塔斜拉桥，采用塔梁固结，塔墩分离的结构型式。桥塔为C60钢筋混凝土结构，塔身以圆弧曲线外倾，横向双塔呈八字造型；主梁为三向预应力混凝土结构，单箱五室，桥梁标准宽度37.5 m，桥塔处局部加宽为40.4 m；斜拉索为双索面竖琴型空间索面，拉索采用填充型环氧钢绞线，菱形分丝管索鞍。通过对主梁和桥塔的极限状态计算分析，结构安全可靠；桥梁实施过程也表明采用的施工方案合理可行，可为同类桥梁建设提供参考。

Abstract:

The Jingui Road Bridge crossing the Liuyang River is a double-pylon double-plane low-pylon cable-stayed bridge with the main span of 120 m. Its structural style is in the pylon-beam consolidation and pylon-pier separation. The bridge pylon is a C60 reinforced concrete structure. The pylon body leans outward in an arc curve, and the two horizontal pylons form an “figure-eight” shape. The girder is a three-way prestressed concrete structure with a single-box five-cell section. The standard width of the bridge is 37.5 m, locally widening to 40.4 m at the pylons. The stay cables are arranged in a double-plane harp-type spatial configuration. The stay cables are made of filled epoxy steel strands and diamond-shaped branch pipe saddles. Through the calculation and analysis of the limit states of the girder and the bridge pylon, the structure is safe and reliable. The implementation process of the bridge also indicates that the adopted construction scheme is reasonable and feasible, which can provide a reference for the construction of similar bridges.