渝怀电气化铁路营业线增建明洞施工技术

Construction Technique of Constructing Cut-and-cover Tunnel over the Electrified Railway for Chongqing-Huaihua in Operation

研究目的:当已经投入运营的电气化铁路为了抵御山体塌方的侵害,需要增建明洞,势必在上方有高压接触网、下方有行车轨道、列车照常运营的复杂环境中施工,如果技术措施不当,施工进度就无法保证,甚至会影响行车安全或者导致作业人员触电。因此,必须研究安全、稳妥技术措施。研究结论:渝怀电气化铁路增建"拜幺坡明洞",采取隔一施一、跳跃式架空线路的方式,解决了快速掏挖道床、建造明洞基础与保持轨道稳定的矛盾;研发"拱门"形钢管支架为接触悬挂过渡安置,避免了在接触网支柱拆除之后、接触网与受电弓断流现象;创新制造的架在边墙顶部的具备升降、滑移、防电功能的衬砌台车,达到了拱圈构筑铁路不封锁、不限速,施工人员不触电、快速作业目的。上述新颖施工技术,具有推广应用价值。

Research purposes： In order to resist the landslides while constructing a new open cut tunnel lor an existing electrified railway, in condition of normal operation of the railway, in spite of the HV contact wire overhead and tracks below the line. If the reasonable measures are not taken, the delay of the construction progress is not guaranteed it will frequently and seriously threaten the traffic safety. Therefore, we must adopt safe and secure measures. Research conclusions：The cut - and - cover tunnel will be constructed over the electrified railway for Chongqing - Huaihua in operation. According to the technology of ＂One cut - and - cover tunnel and one interval＂, it solves the difficult problem of constructing subgrade of the cut - and - cover tunnel without impact on the regular operation of railway. The approach to the development of installing the ＂arch＂ steel tube brace for the transitional contact the way of suspension solves the difficulty of possibility of the electricity current cutting by which the catenary and locomotive in question are supported in case the existing pillars be removed. It originally makes the lining trolley in the arch ring which has the functions of lifting, sliding and anti - electric. It solves the problem that the lining trolley would not touch the contact wire while performing on the contact wire net and also protects the workers from the danger of electric shock. It could carry out the construction and guarantee the safety of operation at the same time with the arch ring of reverse templates. The above -mentioned new technology in construction is worthy being applied in the similar projects.