Integrating with the design and construction of Beichengzihe Bridge suspender replacement as an example,the paper introduces design principles and idea and construction procedure of tied-arch bridge suspender replacement.Through comparing new suspender scheme to the old one and describing internal force conversion mode in suspender replacement,it illustrates the significances and difficulties of suspender replacement engineering,to direct the similar constructions in future.%以北澄子河大桥吊杆更换的设计和施工为例,简要介绍了系杆拱桥吊杆更换的设计原则和思路,以及施工工艺流程,通过新吊杆方案的比选、吊杆更换过程中的内力转换方式的介绍,说明了吊杆更换工程的重点和难点,以指导今后同类项目施工。
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