重庆几江长江大桥主桥设计

Design of Main Bridge of Jijiang Changjiang River Bridge in Chongqing

重庆几江长江大桥主桥为176m+600m+140m的单跨悬吊钢箱梁悬索桥。全桥共布置2根主缆,主缆采用预制平行钢丝索股结构、新型缠包带除湿防护体系、预应力钢束锚固系统。主缆与加劲梁间共设49对吊索,吊索采用预制平行钢丝束股,其上、下端连接方式均为销接式。主索鞍鞍体采用全铸型结构,散索鞍鞍体采用铸焊结合的结构。加劲梁采用流线型扁平钢箱梁,梁高3m、宽33m。南锚碇采用重力式锚碇,沉井基础;北锚碇位于软岩区,采用型钢加劲复合式隧道锚碇。桥塔采用钢筋混凝土框架结构,基础采用分离式承台钻孔桩基础。

The main bridge of the Jijiang Changjiang River Bridge in Chongqing is a single-span steel box girder suspension bridge with span arrangement 176 m＋600 m＋140 m. On the whole bridge of the bridge, totally 2 main cables are arranged and the cables are the prefabricated parallel wire strand structures provided with the new type of the dehumidification protection systems of wrapping tapes and the prestressing strand anchor systems. In between the main cables and the stiffening girder, totally 49 pairs of the suspenders are arranged. The suspenders are also the pre-fabricated parallel wire strands and the connections of the upper and lower ends of the suspenders and the splay saddles are the cast and welded structures. The stiffening girder is the streamlined flat steel box girder that is 3 m in depth and 33 m in width. The south anchorage is the gravity an-chorage supported on the open caisson foundation while the north anchorage is located in the soft rock area and is designed as the composite tunnel anchorage stiffened by the shaped steels. The towers are the reinforced concrete frame structures and the foundations for the towers are the bored piles with separated pile caps.