地铁既有车站上盖增层明挖法施工的关键技术
王志康
Key Technology of Open Excavation Construction for Adding Overlaying Level on Existing Metro Station
WANG Zhikang
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作者信息:中铁十四局集团有限公司， 250014， 济南
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Affiliation:China Railway 14th Bureau Group Co., Ltd., 250014, Ji′nan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.10.032
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中图分类号/CLCN:U231.3; U231.4
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栏目/Col:施工技术
摘要:
依托北京地铁苹果园站，提出了一种车站既有结构上盖增层的建造方法。结果表明：明挖法基坑的稳定性受车站既有结构影响较大，通过桩底与初支结构连接、桩后深孔注浆加固和预留反压土可有效抑制围护结构变形；为保障车站结构的整体性，下部暗挖结构应预留接头，同时对接头处进行超厚混凝土回填；地铁车站接头处采用SBS(改性沥青防水卷材)搭接的方式能够保障结构的防水性能。
Abstracts:
Based on Beijing Metro Pingguoyuan Station, a construction method for adding overlaying level on the station existing structure is proposed. Results show that the stability of open excavation foundation pit is greatly affected by the station existing structure. Through connecting pile bottom and primary support structure, connecting pile back deep-hole grouting reinforcement and reserved anti-pressure soil, the enclosure structure deformation can be effectively suppressed. To sustain the station structure integrity, the bottom underground-excavated structure should reserve joint heads and conduct super-thick concrete backfilling at the joint. The joints of metro station that adopt SBS (modified asphalt waterproofing roll) lapping connection method will ensure the waterproof performance of the structure.
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