Abstract: Appling temporary steel bridge is a method of passing bridge which span is not bigness in heavy-cargo transportation．This paper introduces a method with temporary steel bridge combined with original bridge could solve the original bridge not carrying enough capacity．when 323 ton heavy-cargo pass bridge whose span is 16m in Yanjia chemical plant of ehangshou district is applied．This pass programe save much consolidating cost and gained great benefit．This paper introduces the whole design and calculation of temporary steel bridge．

Key words: heavy-cargo transportation；temporary steel bridge；design, practice

摘要： “桥上桥”是大件运输中通过中小跨径桥梁的一种方法．介绍了运输323t甲醛交换塔通过长寿区宴家化工园区跨度16m斜交梁桥，应用“桥上桥”结合原桥共同受力解决原桥承载力不足的问题，节省了大量加固费用和时间，取得了显著的技术经济效益．详细论述了“桥上桥”设计的计算过程和实践效果．

关键词: 大件运输, 桥上桥, 设计, 实践