隧道仰拱作业区快速施工技术

A Rapid Construction Technology of Tunnel Invert Operation Area

针对隧道仰拱作业线工效不平衡、安全步距大等问题,提出了隧道仰拱作业区快速施工技术,有效解决了仰拱施工进度慢的难点,达到了平衡安全和进度管理要求的目的。该施工技术是研发设计新型大跨度伸缩式仰拱栈桥来实现的,通过利用栈桥导梁伸缩等功能形成了仰拱开挖支护、仰拱衬砌、仰拱填充3个并行、流水作业区间,以及掌子面、仰拱、二次衬砌3大协同作业线的施工模式,有效提升了掌子面、仰拱衬砌作业效率,缩短二衬台车跟进时间,提高隧道仰拱施工综合进度。通过在郑万铁路应用验证,结果表明,该新技术有效提高隧道施工工效,还降低了施工成本,缩短了施工安全步距,具有很好的推广价值和应用前景。

Aiming at the problems of unbalanced work efficiency of tunnel invert operation line and large safety step distance,the rapid construction technology of tunnel invert operation area was proposed.The technology effectively solves the difficulty of slow invert construction progress and achieves the goal of balancing safety and schedule management requirements.The construction technology was realized by the research of a new large-span telescopic invert arch trestle.By using the functions of the trestle bridge′s guide beam extension and other functions,three parallel and streamlined operation sections of invert excavation support,invert lining and invert filling are formed.And the construction mode of the three coordinated operation lines of tunnel face,invert and secondary lining,and forms three coordinated operation lines of tunnel face,invert and secondary lining.The technology effectively improves the work efficiency of the tunnel face and invert lining,and shortens the follow-up time of the secondary lining trolley,and improves the comprehensive construction progress of the tunnel.Through the application verification in Zhengwan Railway,the results show that the new technology effectively improves the efficiency of tunnel construction,also reduces the construction cost,shortens the construction safety step,and has good promotion value and application prospects.