一、引言桥式起重机主梁形式很多,我们主要研究箱形或板梁结构的主梁在设备维修中的技术标准问题。在设备维修中,起重机主梁没有自己的标准,主要按照设计和制造单位的出厂标准,这样就给生产和设备维修工作带来很多具体问题一直没有得到解决。本文从理论上和在生产实践中所体会到的 I. INTRODUCTION There are many forms of bridge girders, and we mainly study the technical standards of the girders of box-shaped or plate-beam structures in equipment maintenance. In equipment maintenance, crane girders do not have their own standards, mainly in accordance with the factory design and manufacturing standards, thus giving rise to production and equipment maintenance has caused many specific problems have not been solved. This article is theoretically and practically realized in production practice