贵港市同济大桥自锚式悬索桥总体设计

Overall Design of Self-Anchored Suspension Bridge of Tongji Bridge in Guigang City

贵港市同济大桥主桥为主跨280m的自锚式悬索桥,桥跨布置为(50+140+280+140+50)m,桥面宽37.5m。悬吊跨主梁为单箱多室钢箱梁,采用顶推法施工,最大顶推跨径2×85m。两端锚跨采用预应力混凝土结构。桥塔采用独柱式"荷花"造型,桥面以上塔柱不设置横梁,横向呈"H"形框架结构,景观造型新颖美观,桥塔结构最小稳定安全系数6.4。主缆采用预制平行钢丝索股,钢丝抗拉强度标准值为1 670 MPa,主缆强度安全系数2.71大于2.5,满足规范要求;吊索及索夹为销接式结构,主索鞍为全铸式结构,鞍底与底座座板间设滑动摩擦副。

The main bridge of the Tongji Bridge in Guigang City,with span arrangement of（50＋140＋280＋140＋50）m,is a self-anchored suspension bridge that has a main span of 280 m and bridge deck width of 37.5 m.The main suspended girders are the multiple cells single box steel structures,erected by incremental launching method with maximum launching spans of 2×85m.The two end spans adopt the prestressed concrete structures.The towers are lotus-shaped single-column towers without cross beam above the deck.The tower looks like an H-shaped frame structure in plan,quite elegant aesthetically,and the minimum stable and safe coefficient of the bridge structure is 6.4.The main cables are composed of prefabricated parallel steel wire strands,the standard tensile strength of the steel wires is no less than 1 670 MPa.The strength safety coefficient of the main cable is 2.71,greater than the prescribed 2.5,which meet the code requirements.The hanger cables and the cable clamps are linked by pin connection.The main cable saddles are fully-cast structures,between the saddle base and the saddle pedestal plate,sliding friction sets are installed.