摘要
京沈高铁望京隧道施工过程中盾构段右线第397环管片被打桩击穿,为了不影响隧道后期的正常施工和运营,保证隧道净空、结构安全和防水,特别是确保地表邻近的110 k V高压电力铁塔的安全,通过对3种修复方案的综合对比,最终采取在隧道内搭设临时钢架支撑和焊接管片拉紧槽钢、地面施作隔离桩、全断面高压旋喷桩和地表跟踪补偿注浆、开挖辅助竖井对破损管片的混凝土结构和防水进行彻底修复的施工方法和措施,成功地解决了邻近高压电力铁塔开挖竖井修复管片空间狭小、地层涌水量大、沉降变形要求高、安全风险高、施工难度大等难题。
The 397th ring segment of the right line of the Wangjing tunnel of the Beijing-Shenyang high-speed railway was penetrated by piling.To guarantee the normal construction and operation of the tunnel,the tunnel clearance,structural safety,and waterproof,especially the safety of 110 k V high piezoelectric iron tower adjacent to the surface,a comprehensive comparison among three repairing schemes is conducted for the shield tunnel.A series of repairing techniques such as temporary steel frame support and welded segment to tighten the channel steel,isolation pile construction on ground,full-section high-pressure jet grouting pile and surface tracking compensation grouting,and auxiliary vertical shaft excavation to completely repair the concrete structure and waterproof of damaged segments have been employed,which successfully repaired the damaged segments adjacent to high piezoelectric iron tower with various difficulties such as narrow space,large formation water inflow,strict settlement and deformation requirements,high safety risk and difficult construction.
作者
花楠
翟志国
刘柳
HUA Nan;ZHAI Zhiguo;LIU Liu(The 2nd Engineering Company of China Railway Tunnel Group,Sanhe 065201,Hebei,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,Hebei,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2022年第S01期466-479,共14页
Tunnel Construction
关键词
盾构隧道
管片
击穿
竖井
隔离桩
高压旋喷桩
shield tunnels
segment
broken down
vertical shaft
isolation pile
high pressure jet grouting pile
