2014年9月上第43卷第17期
DOI:10. 7672/sgjs2014170053
施工技术
CONSTRUCTION TECHNOLOGY
新白沙沱长江特大桥施工便线工程施工技术
李艳哲
（中铁大桥局集团第一工程有限公司，河南郑州450053）
【摘要】重庆一贵阳铁路新白沙沱长江大桥主桥及贵阳岸引桥设计线路受既有川黔线及地形、地貌和桥位资源限制，主桥桥头设计先修建临近旧线的1.26km长施工便线，改移运营列车到施工便线上以后，在旧线路上修建新线桥梁、路基及结构物，两线最远距离30m，属两次临近既有线施工，且旧线旁多为较陡、较高的石质路堑，便线修筑需先行大面积爆破前坡，清除石方，使线既有路堑拓宽施工，文有路堤填筑、帮宽施工，特殊地基段需CFG桩加固处理。重点介绍了合适的便线施工方案、方法，安全合理的防护措施，有效的监测手段，满足施工风险控制要求，使铁路运营和施工作业安全可控。
【关键词］公路工程；桥梁工程；斜拉桥；施工便线；施工技术
［中图分类号］U445
【文献标识码］A
[文章编号】1002-8498（2014)17-0053-04
ConstructionTechnologyofMakeshiftRailwayfortheNew
Baishatuo Yangtze River Bridge
LiYanzhe
(The First Engineering Co. , Lid. , China Railuay Major Bridge Engineering Group,
Zhengzhou,He'nan450053,China)
Abstract:Because the design line is limited by both the existing railway from Sichuan to Guizhou, topography and room resource, before building the mian bridge and approaching bridge close to Guiyang of new Baishatuo Yangtze River Bridge for the railway from Chongqing to Guiyang, it is necessary to build 1. 26km makeshift railway near the existing bridge first, and makes trains running on the makeshift railway, then builds the new bridge, roadbed and structures on the site of the old railway. There is no more than 3Om from the old railway to the makeshift railway, engineers have to work close to railway two times which is being used. The rocky cutting slopes of the old railway are precipitous and high, need to cut slopes by blasting rocks in a large area. To build the makeshift railway, the old railway cuttings and embankments will be widened, in some sections, special foundations need to be reinforced by CFG piles. This paper focuses on the right construction methods, safety and reasonable protective measures, effective monitoring means for the railway construction, to meet the requirements of construction risk control, and make sure that the railway operation and construction risks are in the control.
Key words : road construction; bridges ; cable stayed bridges ; makeshift railway; construction
1工程概况
重庆一贵阳铁路改造工程位于重庆市西南部
和贵州省北部地区，新建白沙长江特大桥位于重庆市大渡口区跳叠镇与江津区珞璜镇接壤地带，上距已建川黔铁路白沙沱铁路桥130m，距地维水泥厂专用公路桥约2.3km。桥位下游1.3km为规划小
*中铁大桥局科研项目（桥经[2013]148号）：双层六线大跨度重载铁路斜拉桥建造技术研究
【作者简介］李艳哲，教授级高级工程师，E-mail；zlyz@126.com【收稿日期］2014-05-08
53
南海水利枢纽坝址。主桥为6线连续钢梁斜拉桥，跨度组成为（81+162+432+162+81）m，主桥渝黔客线、渝湘通道、渝黔货线合建段00~05号墩。上层桥面为渝黔客车线双线、预留渝湘通道双线，下层桥面为渝黔引入货车线双线。珞璜施工便线起里程为K5+200一K6+463.45，全长 1263.45m，其中K5+200K5+500段路基利用既有川黔线，K5+500一K6+265段路基以路堑为主 K6+265一K6+463.45段路基以填方为主，有路堑拓宽施工，路堤填筑、帮宽施工。全线均临近既有