Abstract: There are 120 bridges and culverts in the way of the heavy-cargo transportation of Kaixian Baihe Powerplant, Chongqing,57 bridges of them were used the co-bearing pass program of Prestressed Temporary Steel bridge combined with Partly Bearing Pier.The pass program saved much consolidating cost.The paper introduced the details of the program to deal with the less stiffness of 20m span Prestressed Temporary Steel bridge and the whole calculation of the design

Key words: bridge engineering, heavy-cargo transportation, partly bearing pier, critical live load, surplus live load

摘要： “桥上桥”是大件运输中通过小跨径桥梁的一种常用方法。笔者在文中介绍了临时预应力“桥上桥”结合原 桥共同受力解决大件运输中原桥承载能力不足的问题，节省了大量桥梁加固费用与时间，取得了显著的技术经济 效益。笔者在文中拟对解决20m跨径“桥上桥”刚度不足、挠度过大的设计方案进行了介绍，并详细论述了其设 计及计算过程，以供参考

关键词: 桥梁工程, 大件运输, 部分承载支墩, 临界活载, 剩余活载