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近年来,我国20世纪七八十年代修建的大量中下承式拱桥因吊杆锈蚀等病害,需要进行吊杆更换。在可预计的将来,越来越多的中下承式拱桥将面临吊杆更换的问题。由于绝大多数中下承式拱桥在设计之初并没有考虑吊杆更换的问题,吊杆更换有一定的特殊性。文中论述了中下承式拱桥吊杆更换方法,并成功地应用于工程实践,可为同类工程提供技术参考。
In recent years, a large number of middle-and-small bearing bridges constructed in the seventies and eighties of the 20th century in our country require the replacement of the boom due to the rusting of the boom. In the foreseeable future, more and more under-coming bridges will face the problem of boom replacement. As the vast majority of middle and lower reaches of the arch bridge at the beginning of the design did not consider the replacement of the boom, boom replacement has a certain specificity. This paper discusses the method of replacing middle and lower supporting bridge suspension rod, and successfully applied in engineering practice, which can provide technical reference for similar projects.