大断面平顶直墙暗挖隧道下穿天桥施工关键技术研究

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【中图分类号】：U455.4 【文献标志码】：A 【文章编号】：1008-3197（2025）06-16-05

【DOI编码】：10.3969/j.issn.1008-3197.2025.06-004

Key Research on Construction Technology for Underpass Overpass of Large SectionHorizontal Proof and StraightWallUnder Tunnel

WANGBingyan

（China Railway 15th Bureau Group 5nd CorporationLimited，Tianjin 300133，China）

【Abstract】：Taking theconstructionofanew subway stationin Beijing as an example，this paper introduces the constructiontechnologyof the two-story ten pilottunnel with flatroofand straight wall，analyzes theactive roof support protectionscheme of the tunnel under crossng the existing bridge facilities，and the influence of tunnel constructionon thesettlement of thebridge structure.Under the seting of the initial support structure of two一 story ten pilot tunnels，theconcealed excavationconstructionofthesideand middle pilot tunnelson both sides is the main construction processcausing the setlement of the bridge structure，and the quality control should be strengthened in the construction.

【Key words】：underground excavation tunnel; horizontal proof and straight wall;bridge lifting

平顶直墙结构是在隧道因外部环境限制而无法按传统拱形断面实施时所采用的一种特殊结构形式～2。（剩余6129字）