摘要
以商丘站西咽喉区梁园路铁路框架桥为例,桥址处地下水位高,且临近郑徐高铁,开挖时无法采用常规竖井抽降水,为保证支点桩施工可行性,提出支点转换过波方式完成架空支点桩施工;同时,该工点位于铁路道岔区,股道较多,需采取纵横抬梁法进行线路加固。本文通过对纵横抬梁体系结构强度、刚度、应力等方面的检算,并以施工监测结果为指导,论证计算结果的时效性;最后对支点转换架空方式进行优化设计,以解决人工挖孔困难的问题。研究结果表明,道岔区纵横梁强度、刚度、局部应力均满足行车及规范要求,支点桩过渡转换方式能有效解决由于地下水位过高、人工挖孔困难的问題,研究结果可为今后同类型顶进框架设计提供经验。
With the example of Liangyuan Road frame railway bridge in west throat area of Shangqiu Railway Station,it was impossible to drain water by conventional shaft because of its high groundwater level and adjacent to high-speed railway.In order to ensure the construction of fulcrum piles,a transition mode of fulcrum conversion was proposed to complete the construction of overhead fulcrum piles,meanwhile,this p>oint was located in the turnout area of railway,and there were many tracks,so the longitudinal and transverse lifting beam method was needed to reinforce the line.In this paper,the strength,stiffness and stress of the longitudinal and transverse lifting beam structure were verified,and the effectiveness of the calculation results was demonstrated under the guidance of the construction monitoring results.In the e nd,the transition mode of fulcrum conversion was optimized to solve the problem of manual hole digging pile.The results show that the strength,stiffness and local stress of longitudinal and transverse beams in turnout area meet the requirements of train operation and specifications,the transition mode of fulcrum conversion can effectively solve the problems of high groundwater level and difficult manual excavation,which could provide experience for similar jacking frame design in the future.
作者
李文浩
Li Wenhao(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan Hubei 430063,China)
出处
《铁道建筑技术》
2019年第12期59-62,共4页
Railway Construction Technology
关键词
顶进框架桥
地下水
支点转换
道岔区
jacking frame bridge
groundwater
fulcrum conversion
turnout area
