双向预应力技术在唐徕渠跨北塔湖大型渡槽中的应用

针对宁夏唐徕渠跨北塔湖渡槽工期紧、施工难度大,渡槽流量大、受通航要求限制,以及槽下受地质和水流等边界条件限制的特殊性,首次采用纵向（纵梁）、横向（底肋）后张法双向预应力技术、大跨度预制渡槽侧墙吊运安装二次浇注底板的设计和施工方案,实现了设计与施工技术的成功应用.

Two-way prestressed technology applied in Tanglai channels through Beita lake large-scale aqueduct

In view of particularity of the Beita Lake aqueduct, which crosses Tanglai channels, the two-way prestressed technology is adopted,and after sidewalks in large span structures of aqueduct is prefabricated and hoisted,secondary floor is poured in design and construction plan. The result shows the comprehensive function of aqueduct is implemented in complicated conditions,such as short construction period,larger span of structures,navigation under aqueduct,prefabrication and hoisting of large sidewall.