上软下硬地层区段新建地铁线路盾构法下穿既有地铁运营线路关键施工技术
章邦超
Key Construction Techniques for Metro Lines with Shield Tunneling Method under-crossing existing Lines in Upper-Soft Lower-Hard Stratum
ZHANG Bangchao
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作者信息:中铁华南建设有限公司，511458，广州
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Affiliation:China Railway Construction South China Construction Co., Ltd., 511458, Guangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.09.028
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
近年来，新建地铁线路盾构法下穿既有地铁运营线路的情况越来越多。针对广州地区常见的上软下硬地层，以广州地铁22号线盾构法下穿既有3号线工程为例分析关键施工技术。将水平定向钻施工、超前预支护、预加固等传统方法与盾构法施工相结合，形成了地面水平定向钻孔注浆、盾构机超前注浆孔注浆、洞内深孔跟踪注浆等加固方法，并结合工程经验和理论计算设定了最优施工参数和自动化监测方案。工程实践表明，所采用的加固方法严格控制了既有线路变形和位移，确保了既有线路的运营安全，也降低了新建线路施工安全风险。
Abstracts:
In recent years, there are more and more cases of newly built metro lines with shield tunneling method under-crossing existing lines. For the common upper-soft lower-hard stratum in Guangzhou area, construction of Guangzhou Metro Line 22 under-crossing the existing Line 3 project by shield tunneling method is taken as an example to analyze the key construction techniques. Combining traditional construction methods such as horizontal directional drilling, advanced pre-supporting and pre-reinforcement, with shield construction, reinforcement techniques such as ground horizontal directional drilling, shield machine advanced grouting hole grouting, and deep cave hole tracking grouting are formed. With engineering experience and theoretical calculations, optimal construction parameters and automatic monitoring plan are set. Engineering practice shows that the adopted reinforcement method strictly controls the deformation and displacement of lines, ensuring operational safety of the existing line and construction safety of the new line.
引文 / Ref:
章邦超.上软下硬地层区段新建地铁线路盾构法下穿既有地铁运营线路关键施工技术[J].城市轨道交通研究，2021，24(9):132.
ZHANG Bangchao.Key construction techniques for metro lines with shield tunneling method under-crossing existing lines in upper-soft lower-hard stratum[J].Urban Mass Transit，2021，24(9)：132.
ZHANG Bangchao.Key construction techniques for metro lines with shield tunneling method under-crossing existing lines in upper-soft lower-hard stratum[J].Urban Mass Transit，2021，24(9)：132.
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