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以京九铁路吉安赣江特大桥和浙赣铁路尖山江大桥简支钢桁梁为例，介绍了在施工中对各种因素引起落梁长度修正的计算及处理方法。
Taking the simple supported steel truss girder of Ji’an Ganjiang Bridge of Beijing-Kowloon Railway and the Jianshanjiang Bridge of Zhejiang-Jiangxi Railway as an example, the calculation and treatment of the length of falling beam caused by various factors are introduced.