Paper Infomation
Long-Distance Shield Tunneling Through Flexible Casings and Atmospheric Pressure Chamber Opening for Obstacle Removal in Urban Central Areas
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Author: Yuwei Su
Abstract: 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.
Keywords: Slurry Pressure Balance Shield; Obstacle Removal; HDPE Flexible Trenchless Pipeline; Chamber Opening
References:
[1] 陈沈玮.一种盾构断面内非开挖管线处理技术[J].中文科技期刊数据库（全文版）工程技术, 2021.
[2] 宁寅.盾构切削穿越高强度MPP套管群施工技术[J].中国市政工程, 2018(3):3.DOI:CNKI:SUN:ZGSZ.0.2018-03-026.
[3] 郁进峰.管道顶进中的全气压清障施工技术[J].建筑施工, 2011, 33(3):3.DOI:CNKI:SUN:JZSG.0.2011-03-025.