| Chongqing Shibanpo bridge is located between Yuzhong district and Nan'an district, which built in the early 1980s.With the constantly and rapid development of national economy and quick increasing vehicle population as well as particularity of the bridge location, the daily traffic volume of Shibanpo bridge has stood the first place among all the bridges crossing over river in Chongqing. Now it has been the main bottle-neck in the road net of this district. It will be correct and scientific that reforming the original traffic facilities in time to make it act better on the condition of fund limited. Whole road system is to work with higher efficiency and better cooperation, through partial reforming some bottle-neck place of the present road net which is a economy and efficient way.By analyzing the economy development, road planning, traffic increase and demand of this district, this paper demonstrates the necessity of widening the bridge. In the conceptual design of main bridge,, restrict factor, such as navigation (one span crossing the main channel), landscape, security, rebuilding old bridge and some mature construction technique as cantilever segmental construction, steel box beam manufacture, large-tonnage lifting were taken into account. A steel-concrete co-operation system of continuous rigid frame bridge with seven span (86.5+4×138+330+132.5=1101m) is recommended as executive plan. The resource of bridge site is fully used with this plan.
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