摘要
在中心城区盾构隧道施工中,盾构机遭遇地下废弃非开挖管线的问题愈发频繁,已成为制约施工顺利推进的棘手难题。针对该问题,本文提出三大核心应对方案,包括设备改造、套管预注浆及正反冲循环技术;同时,为适配长距离掘进中的停机工况,增设中途加固区用于开仓清障。上述措施已在上海市徐汇区龙华污水处理厂初期雨水调蓄工程2#~5#区段(3公里DN3500盾构隧道)中得到实践验证,证实了其可行性与有效性,可为同类工程的施工提供重要借鉴。
In shield tunneling projects within urban central areas,shield machines increasingly encounter abandoned underground trenchless pipelines,posing a persistent and challenging obstacle to smooth construction progress.To address this issue,this paper proposes three core countermeasures:equipment modification,pre-grouting of casings,and forward-reverse flushing circulation technology.Additionally,to accommodate stoppage conditions during long-distance tunneling,intermediate reinforcement zones have been established to facilitate atmospheric-pressure chamber opening for obstacle removal.These measures have been successfully implemented and validated in the Section 2#-5#(a 3-km-long DN3500 shield tunnel)of the Longhua Wastewater Treatment Plant’s Initial Rainfall Storage Project in Xuhui District,Shanghai,demonstrating their feasibility and effectiveness,thereby offering valuable reference for similar engineering projects.
作者
苏雨威
Yuwei Su(Shanghai Municipal Water Conservancy Construction Project Safety and Quality Supervision Center Station,Shanghai 200237,China)
关键词
泥水平衡盾构
清障
HDPE柔性非开挖管线
开仓
Slurry Pressure Balance Shield
Obstacle Removal
HDPE Flexible Trenchless Pipeline
Chamber Opening
