通过既有线铁路提速试验，分析了上承钢板梁横向刚度的要求，提出合理的加固方案。
To analyse the demand of transverse rigidity and the strengthening scheme of deck plate girder according to the raising speed experiment of the existing track.
施工为例，较为详细地介绍了铁路既有线改造工程并行段桥涵施工中采用挖孔桩防护的设计原理。
Give a more detailed description of the design principle that used protection with dug pile in transformation of existing railway bridge and culvert construction in parallel paragraph.
针对GPS实时动态定位技术在铁路勘测中的应用，提出连续三角网重复设站测量既有线的方法。
A new surveying method with GPS RTK technique is proposed for the existing railway by overlapped stations in continuous triangle networks.
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