从国内外起重机设计标准要求的差异性出发,对桥式类型起重机主梁挠度问题进行了探讨,提出采用有限元法对桥式类型起重机的主梁预拱度进行准确计算,取代常用的经验计算法,给出了各种桥式类型起重机主梁挠度的计算方法,并推导了主梁制造前腹板下料拱度曲线的计算公式。对起重机的使用和报废判别基准提出修改完善建议。 Based on the difference of crane design standards both at home and abroad, this paper discusses the deflection problem of girder of bridge type crane, and proposes the finite element method to accurately calculate the pre-camber of girder of bridge type crane instead of the commonly used empirical calculation The calculation method of the girder deflection of various bridge type cranes is given and the formula for calculating the crown curve of the front web under the main girder is deduced. Proposed amendments to improve the use of the crane and scrapping benchmarks.