既有复线增建涵洞工字钢扣轨施工技术

The Construction Technique of Building Out Culverts with Steel I-beam on the Original Double Pipeline

株六复线贵阳枢纽C标增建二线线下工程,在既有路基处增建新建涵洞(采用明挖施工),设计要求采用P43钢轨加固线路,行车速度不能大于15km,但实际上路基处于曲线半径R=500及坡比是i=1.2%上坡地段,行车速度不低于45km,故采用P36工字钢取代P43钢轨做纵梁,进行扣轨加固施工。

The C coordinate of Guiyang hinge in Zhuliu double pipeline need build out the construction of below-the-line. That is the new culvert construction on the original roadbed （adopting the open cut construction）. This design requires P43 rail pinning up the line. The speed should be with 15km. However, actually, in the uphill sector when curve radius R= 500 and the gradient I= 1.2%, the speed should be no less than 45km, therefore, we should adopt the P36 steel I-beam in the carling construction instead of the P43 rail to connect and pin up the construction.