导粱又称鼻梁。用拖拉法或顶推法架梁时，装于梁前(后)端的临时辅助结构。是为保证梁在移动时的纵向抗倾覆稳定性，以及减少梁的悬伸长度从而降低安装应力，常在梁的前(后)端用拆装式杆件、桁架纵梁或旧钢梁的杆件等加拼的一段小梁，其高度比正梁小，其长度要根据拖拉或顶推过程中的稳定性要求和梁的安装应力不超过设计值决定。
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该机采用连续双导梁的结构形式，作业程序简单，安全可靠，对环境适应性强。
The machine uses continuous double guide beams, it is safe and simple to operate, and has a better adaptability to environment.
详细介绍了对双导梁式架桥机天车、行走系统、有效工作长度及预制梁安装就位的改进情况。
The text detailedly introduced crown block, running system, availability work period of bridge girder erection equipment and improve case for precast beams install.
以A NSYS为分析工具，对铁路架桥机导梁焊接缺陷进行有限元分析，为导梁进行结构安全评定提供依据。
The finite element analysis of the bridge-erecting machine 'beam under welding defect conditions is conducted with ANSYS program, which provides a basis for the structural safety assessment of beam.
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