长昆线桥隧相接段危岩落石防护结构方案研究  

Research on the Rockfall Protection Structure for Junction Area between Bridge and Tunnel in the Changsha-Kunming Railway Line

作　　者：罗仁立[1] 郦亚军[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2016年第2期59-63,共5页Journal of Railway Engineering Society

摘　　要：研究目的:长昆线工程建设后期部分工点仰坡危岩落石发育,针对接长段落位于桥隧相接段,主体工程施工干扰大,施工工期紧等特殊情况,本文分别对护桥明洞、横向刚架棚洞及纵向刚架棚洞方案的适用条件、结构内力等进行分析比较,通过方案比选得出在不同条件下适宜不同工点的接长防护方案。研究结论:(1)防护结构的设计应充分考虑现场实际情况,尤其对现场施工条件、工程干扰情况等要充分认识;(2)对于施工现场有隧道模板台车的工点,宜优先考虑护桥明洞结构;(3)横向刚架棚洞横顶梁施工干扰因素较大,同时结构内力较大,在工程建设后期接长结构方案中不宜采用;(4)纵向刚架棚洞的施工可合理避开工程干扰,受力较合理,可结合现场预制、吊装条件选择顶部预制T梁和顶部现浇空心板梁方案;(5)本研究成果可对类似铁路工程建设后期桥隧相接段接长结构的选型提供一定参考。Research purposes： In the later construction period of the Changsha - Kunming Railway Line, some working points need rockfall protection structures which are located at junction area between bridge and tunnel, the construction disturbance is serious, and the schedule is very tight. According to these factors, through analysis and comparison of the open - cut tunnel scheme, the transverse frame scheme and the longitudinal frame scheme from applicable condition and structure internal force, the better design schemes are confirmed for different conditions. Research conclusions： （1） When design the rockfall protection structure, the field condition and the construction disturbance should be fully considered. （2） When there is mould plate trolley, the open - cut tunnel scheme is the first priority. （3） Because of the construction disturbance and the bigger internal force, transverse frame scheme should not be adopted in the later construction period. （4） The longitudinal frame scheme can avoid the construction disturbance, if the precast and hoisting condition is allowed, T beam is better to be used as the cross beam, otherwise, hollow slab beam is better. （5） This research result could provide a reference for type selection of rockfall protection structure in similar situations.

关 键 词：工程建设后期 桥隧相接段 防护结构 

分 类 号：U25[交通运输工程—道路与铁道工程]